from reportlab.lib import colors
from reportlab.lib.enums import TA_CENTER
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, PageBreak, KeepTogether
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.pdfbase import pdfmetrics
from reportlab.lib.colors import HexColor
from reportlab.pdfbase.pdfmetrics import stringWidth

OUT = '/tmp/workspace/veterinary-anaesthesia-pdf/output/General_Considerations_and_Patient_Evaluation_Veterinary_Anaesthesia.pdf'

styles = getSampleStyleSheet()
styles.add(ParagraphStyle(name='TitleCustom', parent=styles['Title'], fontName='Helvetica-Bold', fontSize=21, leading=25, alignment=TA_CENTER, textColor=HexColor('#12355B'), spaceAfter=12))
styles.add(ParagraphStyle(name='SubTitle', parent=styles['Normal'], fontName='Helvetica', fontSize=11, leading=15, alignment=TA_CENTER, textColor=HexColor('#455A64'), spaceAfter=24))
styles.add(ParagraphStyle(name='H1C', parent=styles['Heading1'], fontName='Helvetica-Bold', fontSize=15, leading=19, textColor=HexColor('#12355B'), spaceBefore=14, spaceAfter=8))
styles.add(ParagraphStyle(name='H2C', parent=styles['Heading2'], fontName='Helvetica-Bold', fontSize=12, leading=15, textColor=HexColor('#15616D'), spaceBefore=10, spaceAfter=5))
styles.add(ParagraphStyle(name='BodyC', parent=styles['BodyText'], fontName='Helvetica', fontSize=9.5, leading=13.2, spaceAfter=6))
styles.add(ParagraphStyle(name='SmallC', parent=styles['BodyText'], fontName='Helvetica', fontSize=8.2, leading=10.7, spaceAfter=3))
styles.add(ParagraphStyle(name='FlowC', parent=styles['BodyText'], fontName='Helvetica-Bold', fontSize=9.5, leading=13, alignment=TA_CENTER, textColor=HexColor('#12355B')))
styles.add(ParagraphStyle(name='NoteC', parent=styles['BodyText'], fontName='Helvetica-Oblique', fontSize=9, leading=12, textColor=HexColor('#4A4A4A')))

P = lambda text, style='BodyC': Paragraph(text, styles[style])

def flow(lines):
    cells=[]
    for i,line in enumerate(lines):
        cells.append([P(line, 'FlowC')])
        if i < len(lines)-1: cells.append([P('&#8595;', 'FlowC')])
    t=Table(cells, colWidths=[15.8*cm], hAlign='CENTER')
    cmd=[('BACKGROUND',(0,0),(-1,-1),HexColor('#EFF7F7')),('BOX',(0,0),(-1,-1),0.7,HexColor('#76B5C5')),('LEFTPADDING',(0,0),(-1,-1),8),('RIGHTPADDING',(0,0),(-1,-1),8),('TOPPADDING',(0,0),(-1,-1),5),('BOTTOMPADDING',(0,0),(-1,-1),5)]
    for i in range(1,len(cells),2): cmd += [('BACKGROUND',(0,i),(0,i),colors.white),('LINEABOVE',(0,i),(0,i),0,colors.white),('LINEBELOW',(0,i),(0,i),0,colors.white)]
    t.setStyle(TableStyle(cmd)); return t

def table(headers, rows, widths):
    data=[[P(h,'SmallC') for h in headers]] + [[P(x,'SmallC') for x in row] for row in rows]
    t=Table(data,colWidths=widths,repeatRows=1,hAlign='LEFT')
    t.setStyle(TableStyle([('BACKGROUND',(0,0),(-1,0),HexColor('#12355B')),('TEXTCOLOR',(0,0),(-1,0),colors.white),('FONTNAME',(0,0),(-1,0),'Helvetica-Bold'),('VALIGN',(0,0),(-1,-1),'TOP'),('GRID',(0,0),(-1,-1),0.35,HexColor('#B0BEC5')),('ROWBACKGROUNDS',(0,1),(-1,-1),[colors.white,HexColor('#F4F9FA')]),('LEFTPADDING',(0,0),(-1,-1),5),('RIGHTPADDING',(0,0),(-1,-1),5),('TOPPADDING',(0,0),(-1,-1),4),('BOTTOMPADDING',(0,0),(-1,-1),4)]))
    return t

def bullet(text): return P('&bull; '+text)

def footer(canvas, doc):
    canvas.saveState(); canvas.setStrokeColor(HexColor('#B0BEC5')); canvas.line(1.6*cm,1.2*cm,19.4*cm,1.2*cm)
    canvas.setFont('Helvetica',8); canvas.setFillColor(HexColor('#546E7A')); canvas.drawString(1.6*cm,.78*cm,'Veterinary Anaesthesiology | General Considerations and Patient Evaluation')
    canvas.drawRightString(19.4*cm,.78*cm,f'Page {doc.page}')
    canvas.restoreState()

doc=SimpleDocTemplate(OUT,pagesize=A4,rightMargin=1.5*cm,leftMargin=1.5*cm,topMargin=1.45*cm,bottomMargin=1.55*cm)
story=[]
story += [Spacer(1,1.0*cm),P('VETERINARY ANAESTHESIOLOGY','TitleCustom'),P('General Considerations of Anaesthesia<br/>and Patient Evaluation','TitleCustom'),P('Easy-language study notes with flow charts, tables, and exam-ready points','SubTitle')]
story += [P('Purpose of this chapter','H1C'),P('Before anaesthesia, the veterinarian must decide whether the animal is fit for the procedure, identify correctable risks, prepare the animal and equipment, and choose an individual anaesthetic and pain-control plan. Anaesthesia is not simply making an animal unconscious. It must also protect breathing, circulation, body temperature, and recovery.'),flow(['Animal requiring a procedure','Preanaesthetic evaluation and risk assessment','Stabilize correctable problems','Select drugs and technique','Monitor and support throughout anaesthesia','Provide safe recovery and pain control']),Spacer(1,8)]
story += [P('1. General considerations of anaesthesia','H1C'),P('<b>General considerations</b> are the factors assessed before choosing an anaesthetic protocol. The objective is safe unconsciousness, adequate analgesia, muscle relaxation where needed, stable body functions, and a smooth recovery.'),table(['Main goals','What this means in practice'],[['Identify risk','Find heart, lung, kidney, liver, dehydration, blood-loss, airway, and drug-interaction problems.'],['Reduce risk','Treat or improve correctable conditions before elective procedures.'],['Choose a plan','Select premedication, induction, maintenance, analgesia, fluid plan, and monitoring.'],['Prepare for problems','Ensure oxygen, airway equipment, IV access, warming, fluids, emergency drugs, and trained staff are ready.']], [5.0*cm,12.0*cm])]
story += [P('2. Factors used to select the anaesthetic technique','H1C'),flow(['Animal factors','Procedure factors','Drug factors','Equipment, personnel, and environment','Individual anaesthetic plan'])]
story += [P('A. Animal factors','H2C'),table(['Factor','Why it matters'],[['Species and breed','Each species and breed can respond differently. Brachycephalic dogs and cats have airway risk; ruminants may regurgitate or bloat; horses can injure themselves during recovery; birds and small mammals lose heat rapidly.'],['Age','Neonates have immature organs, small blood volume, low glucose reserve, and poor temperature control. Geriatric animals often have reduced organ reserve or hidden disease.'],['Weight/body condition','Thin animals become hypothermic and may have low protein stores. Obese animals can be difficult to ventilate and intubate, and drug doses need careful calculation.'],['Temperament','Fear and struggling increase stress, catecholamine release, injury risk, and difficulty of induction. Quiet handling and appropriate sedation are important.'],['Health status','Heart, respiratory, kidney, liver, endocrine, neurological, and blood disorders can alter drug choice, dose, monitoring, and recovery.']], [4.1*cm,12.9*cm])]
story += [P('Special notes on age','H2C'),flow(['Very young animal: immature liver/kidneys, heat loss, hypoglycaemia, small blood volume','Use careful dosing, warmth, glucose awareness, and close monitoring','Old animal: reduced organ reserve and more concurrent disease','Use a gentle protocol, support blood pressure and temperature, and expect slower recovery'])]
story += [P('B. Procedure factors','H2C'),table(['Question','Anaesthetic implication'],[['Is it painful?','Plan analgesia before surgery and use multimodal methods, such as systemic analgesics plus local/regional techniques where suitable.'],['How long will it take?','Long procedures increase hypothermia, hypotension, pressure injury, and fluid-loss risk.'],['Will blood loss occur?','Prepare IV access, fluids, blood typing/crossmatching, and blood products when indicated.'],['What position is required?','Dorsal, lateral, or head-down positions can impair breathing and circulation.'],['Elective or emergency?','Elective cases can be fully prepared. Emergency animals may be shocked, unfasted, dehydrated, or unstable and require rapid stabilization.']], [5.0*cm,12.0*cm])]
story += [P('C. Drug, equipment, and personnel factors','H2C'),bullet('<b>Drug factors:</b> effect on heart rate, blood pressure, breathing, liver and kidney function, analgesia, duration, reversibility, route, and interactions with existing drugs.'),bullet('<b>Equipment factors:</b> oxygen supply, breathing system, endotracheal tubes, laryngoscope, suction, IV supplies, monitors, warming devices, and resuscitation equipment.'),bullet('<b>Team factors:</b> adequate trained staff, written dose calculations, role allocation, checklists, communication, and an anaesthetic record.')]
story += [P('3. Factors modifying drug uptake, distribution, metabolism, and elimination','H1C'),flow(['Drug administration','Uptake / absorption into blood','Distribution to tissues and target organ','Metabolism, mainly in liver','Elimination, mainly through kidneys or lungs'])]
story += [P('A. Uptake or absorption','H2C'),P('Uptake is movement of drug from its administration site into the bloodstream. Intravenous administration is fastest. Intramuscular and subcutaneous absorption depend strongly on blood flow.'),table(['Factor','Effect'],[['Route','IV is rapid and predictable. IM and SC routes are slower and more variable.'],['Blood flow','Good tissue perfusion increases absorption. Shock, vasoconstriction, dehydration, or hypothermia may delay IM/SC uptake.'],['Inhalant agents','Uptake from lung to blood depends on inspired concentration, ventilation, cardiac output, blood solubility, and pulmonary disease.']], [5.0*cm,12.0*cm])]
story += [P('B. Distribution','H2C'),flow(['Blood','Brain, heart, liver, kidneys: rapid delivery','Muscle: intermediate delivery','Fat: slow uptake and possible drug storage'])]
story += [P('Distribution is affected by cardiac output, tissue blood flow, body fat, plasma proteins, hydration, acid-base status, and pregnancy. Some IV agents have a short initial effect because they redistribute from the brain into muscle and fat. This is redistribution, not complete removal from the body.')]
story += [P('C. Metabolism and elimination','H2C'),table(['Step','Key points'],[['Metabolism','Usually occurs in the liver. Liver disease, low liver blood flow, shock, hypotension, hypothermia, very young age, old age, repeated dosing, and drug interactions can slow metabolism.'],['Elimination','Many drugs/metabolites leave via kidneys. Kidney disease, dehydration, low blood pressure, urinary obstruction, and low urine output can delay removal.'],['Inhalant recovery','Most inhalant anaesthetic is removed via the lungs. Turning off the vaporizer and adequate ventilation allow the agent to be exhaled.']], [4.5*cm,12.5*cm])]
story += [P('Clinical meaning','H2C'),flow(['Poor liver/kidney function, hypothermia, shock, or repeated dosing','Slower metabolism or elimination','Drug effect lasts longer','Use dose adjustment, supportive care, and prolonged observation'])]
story += [PageBreak(),P('4. Preanaesthetic patient evaluation','H1C'),P('<b>Definition:</b> A structured assessment before anaesthesia to identify risk factors, select suitable tests, stabilize disease, assign physical-status grade, and create an individual anaesthetic and analgesic plan.'),flow(['History','Physical examination','Selected diagnostic tests','ASA physical-status classification','Risk reduction and preparation','Written anaesthetic plan'])]
story += [P('A. History taking','H2C'),P('History should be obtained from the owner, referral record, and previous hospital record. Ask specific questions instead of relying on “the animal is fine.”'),table(['Area','Important questions'],[['Identity and procedure','Species, breed, age, sex, current body weight, reason for procedure, elective or emergency?'],['Previous anaesthesia','Any vomiting, difficult intubation, delayed recovery, collapse, seizures, adverse drug reaction, or death in related animals?'],['Current medicines','All prescribed drugs, over-the-counter products, supplements, steroids, insulin, anticonvulsants, and herbal products.'],['Food and water','Last meal and water intake; vomiting, regurgitation, diarrhoea, or poor appetite?'],['System review','Cough, noisy breathing, exercise intolerance, fainting, abnormal thirst/urination, seizure, bleeding, weakness, or abdominal distension?'],['Reproductive/environmental history','Pregnancy, lactation, oestrus, trauma, toxin exposure, heat exposure, travel, vaccination, and parasite control.']], [4.3*cm,12.7*cm])]
story += [P('B. Physical examination','H2C'),flow(['Observe animal from a distance','Assess mentation, behaviour, posture, body condition, and pain','Record temperature, pulse, respiration, and body weight','Check mucous membranes, capillary refill time, and hydration','Examine heart, lungs, airway, abdomen, nerves, muscles, skin, and veins','Record abnormalities and decide action'])]
story += [P('Core examination points','H2C'),table(['System','What to check','Why it matters'],[['General','Mentation, body condition, dehydration, pain, temperature','Shows illness, stress, heat loss risk, and ability to compensate.'],['Mucous membranes','Colour, moisture, capillary refill time','Pale may suggest anaemia/shock; blue-grey suggests poor oxygenation; dry/tacky may indicate dehydration.'],['Cardiovascular','Heart rate/rhythm, murmur, pulse strength, perfusion, oedema','Detects reduced cardiac reserve, arrhythmia, shock, or risk of hypotension.'],['Respiratory/airway','Rate, effort, lung sounds, cough, airway noise, oral cavity','Identifies risk of hypoxaemia, difficult ventilation, or difficult intubation.'],['Abdomen/urinary','Pain, distension, mass, bloat, bladder size','May indicate obstruction, aspiration risk, dehydration, electrolyte change, or shock.'],['Nervous/musculoskeletal','Seizures, weakness, trauma, fracture, posture','Affects drug choice, positioning, pain plan, and recovery safety.']], [3.0*cm,7.0*cm,7.0*cm])]
story += [P('5. Preanaesthetic diagnostic tests','H1C'),P('Tests are chosen according to age, history, physical examination, procedure, and anticipated risk. A healthy low-risk animal may need limited testing; an animal with abnormal findings needs targeted investigation.'),flow(['History and examination','Healthy, low-risk patient?','Yes: minimal targeted testing as required','No or uncertain: perform indicated tests and stabilize before elective anaesthesia'])]
story += [table(['Test','Common purpose'],[['CBC / PCV / total protein','Anaemia, infection/inflammation, platelets, hydration, protein status.'],['Blood glucose','Important in neonates, diabetics, weak animals, and small exotic patients.'],['Biochemistry and electrolytes','Kidney/liver function, glucose, protein, sodium, potassium, chloride, calcium.'],['Urinalysis','Kidney concentrating ability, infection, glucose, ketones.'],['Blood pressure / ECG','Hypotension/hypertension, arrhythmia, cardiac disease.'],['Imaging / echocardiography','Respiratory disease, trauma, murmur, suspected cardiac disease.'],['Coagulation profile / blood typing','Bleeding tendency, liver disease, toxin exposure, or expected major haemorrhage.']], [5.5*cm,11.5*cm])]
story += [P('6. ASA physical-status classification','H1C'),P('ASA is the American Society of Anesthesiologists physical-status system. It describes the patient’s general health and anaesthetic risk. It does not describe the difficulty of surgery.'),table(['ASA grade','Meaning','Simple example'],[['I','Normal healthy patient','Healthy young dog for elective sterilization.'],['II','Mild systemic disease','Mild obesity, mild stable dehydration, or mild controlled disease.'],['III','Severe systemic disease','Moderate anaemia, compensated heart disease, chronic kidney disease, or diabetes needing control.'],['IV','Severe systemic disease that is a constant threat to life','Decompensated heart failure, severe shock, serious respiratory compromise, severe trauma.'],['V','Moribund patient not expected to survive without surgery','Severe internal bleeding, gastric dilatation-volvulus with shock, or catastrophic trauma.'],['E','Emergency modifier added to any grade','For example, ASA III-E or ASA IV-E.']], [2.0*cm,8.5*cm,6.5*cm])]
story += [P('ASA quick classification flow','H2C'),flow(['Healthy animal? Yes = ASA I','Mild stable systemic disease? Yes = ASA II','Severe systemic disease, but not immediately life-threatening? Yes = ASA III','Constant threat to life? Yes = ASA IV','Not expected to survive without operation? Yes = ASA V','Emergency procedure? Add E to the grade'])]
story += [P('7. Patient preparation','H1C'),P('Preparation begins after risk assessment and continues until recovery. Correct disease where possible before elective anaesthesia. In emergencies, treat immediate life-threatening problems first and proceed with a safer modified plan.'),table(['Problem found','General preanaesthetic action'],[['Dehydration / hypovolaemia','Establish IV access, provide appropriate fluid support, reassess perfusion.'],['Shock / blood loss','Oxygen, IV access, rapid stabilization, assess need for blood products, and use cautious drug dosing.'],['Hypoglycaemia / electrolyte disorder','Correct before and during anaesthesia as indicated. Potassium abnormalities are especially important.'],['Respiratory compromise','Provide oxygen, assess airway, treat underlying condition where possible, and plan ventilation/monitoring.'],['Hypothermia','Warm the patient before induction and use active warming during and after anaesthesia.'],['Pain / anxiety','Start analgesia and low-stress handling before induction.']], [6.0*cm,11.0*cm])]
story += [P('Fasting and IV access','H2C'),P('Fasting should be individualized according to species, age, medical condition, and urgency. It aims to reduce stomach contents and the risk of vomiting, regurgitation, and aspiration. Avoid prolonged food withholding in neonates, very small patients, diabetics, and animals prone to hypoglycaemia. Emergency animals may not be fasted, so airway protection is particularly important.'),P('For most general anaesthetic events, secure IV access before induction whenever feasible. A catheter permits drug administration, fluid support, blood sampling, and rapid treatment of emergencies.')]
story += [P('Pre-induction checklist','H2C'),flow(['Confirm patient identity, procedure, consent, and fasting plan','Review history, examination, test results, risk factors, and ASA grade','Calculate and label doses; prepare analgesia and emergency drugs','Check oxygen, machine, breathing circuit, endotracheal tubes, laryngoscope, suction, IV fluids, warming, and monitors','Record baseline vital signs and start anaesthetic record','Proceed with individual plan, monitoring, and recovery care'])]
story += [P('8. Exam-ready summary','H1C'),flow(['Assess the animal: species, breed, age, size, temperament, health','Assess the procedure: pain, duration, blood loss, position, urgency','Understand pharmacokinetics: uptake, distribution, metabolism, elimination','Evaluate patient: history, examination, tests, ASA','Prepare and stabilize: fasting decision, IV access, fluids, warmth, analgesia','Plan: premedication, induction, maintenance, monitoring, recovery, emergencies'])]
story += [P('Key message','H2C'),P('There is no single “best” anaesthetic protocol for every animal. The safest approach is an individual plan based on patient health, procedure requirements, drug effects, available equipment, monitoring, and recovery support.'),Spacer(1,10),P('<b>Study note:</b> These notes are for veterinary education. Drug choice, dose, and clinical management must be decided by a qualified veterinarian for the individual patient.','NoteC'),Spacer(1,10),P('Sources used for the study framework: AAHA Anaesthesia and Monitoring Guidelines for Dogs and Cats; general principles of perioperative assessment and anaesthesia.','SmallC')]
doc.build(story,onFirstPage=footer,onLaterPages=footer)
print(OUT)

from reportlab.lib import colors
from reportlab.lib.enums import TA_CENTER
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, PageBreak
from reportlab.lib.colors import HexColor

OUT='/tmp/workspace/veterinary-pain-local-anaesthesia/output/Pain_Management_and_Local_Anaesthesia_Veterinary_Anaesthesiology.pdf'
s=getSampleStyleSheet()
s.add(ParagraphStyle(name='TitleX',parent=s['Title'],fontName='Helvetica-Bold',fontSize=21,leading=25,alignment=TA_CENTER,textColor=HexColor('#12355B'),spaceAfter=10))
s.add(ParagraphStyle(name='SubX',parent=s['Normal'],fontName='Helvetica',fontSize=11,leading=15,alignment=TA_CENTER,textColor=HexColor('#546E7A'),spaceAfter=20))
s.add(ParagraphStyle(name='H1X',parent=s['Heading1'],fontName='Helvetica-Bold',fontSize=15,leading=19,textColor=HexColor('#12355B'),spaceBefore=13,spaceAfter=7))
s.add(ParagraphStyle(name='H2X',parent=s['Heading2'],fontName='Helvetica-Bold',fontSize=11.5,leading=14,textColor=HexColor('#15616D'),spaceBefore=9,spaceAfter=5))
s.add(ParagraphStyle(name='BX',parent=s['BodyText'],fontName='Helvetica',fontSize=9.4,leading=13,spaceAfter=5))
s.add(ParagraphStyle(name='SX',parent=s['BodyText'],fontName='Helvetica',fontSize=8.2,leading=10.5,spaceAfter=2))
s.add(ParagraphStyle(name='FX',parent=s['BodyText'],fontName='Helvetica-Bold',fontSize=9.3,leading=12.5,alignment=TA_CENTER,textColor=HexColor('#12355B')))
s.add(ParagraphStyle(name='NoteX',parent=s['BodyText'],fontName='Helvetica-Oblique',fontSize=8.8,leading=11.5,textColor=HexColor('#4B5563')))
P=lambda x,sty='BX': Paragraph(x,s[sty])
def tbl(h, rows, widths):
 d=[[P(x,'SX') for x in h]]+[[P(x,'SX') for x in r] for r in rows]
 t=Table(d,colWidths=widths,repeatRows=1,hAlign='LEFT')
 t.setStyle(TableStyle([('BACKGROUND',(0,0),(-1,0),HexColor('#12355B')),('TEXTCOLOR',(0,0),(-1,0),colors.white),('FONTNAME',(0,0),(-1,0),'Helvetica-Bold'),('VALIGN',(0,0),(-1,-1),'TOP'),('GRID',(0,0),(-1,-1),.35,HexColor('#B0BEC5')),('ROWBACKGROUNDS',(0,1),(-1,-1),[colors.white,HexColor('#F1F8F8')]),('LEFTPADDING',(0,0),(-1,-1),5),('RIGHTPADDING',(0,0),(-1,-1),5),('TOPPADDING',(0,0),(-1,-1),4),('BOTTOMPADDING',(0,0),(-1,-1),4)])); return t
def flow(lines):
 d=[]
 for i,x in enumerate(lines):
  d.append([P(x,'FX')])
  if i<len(lines)-1:d.append([P('&#8595;','FX')])
 t=Table(d,colWidths=[16.7*cm],hAlign='CENTER')
 st=[('BACKGROUND',(0,0),(-1,-1),HexColor('#EFF8F8')),('BOX',(0,0),(-1,-1),.7,HexColor('#70B5C5')),('LEFTPADDING',(0,0),(-1,-1),8),('RIGHTPADDING',(0,0),(-1,-1),8),('TOPPADDING',(0,0),(-1,-1),5),('BOTTOMPADDING',(0,0),(-1,-1),5)]
 for i in range(1,len(d),2):st.extend([('BACKGROUND',(0,i),(0,i),colors.white),('LINEABOVE',(0,i),(0,i),0,colors.white),('LINEBELOW',(0,i),(0,i),0,colors.white)])
 t.setStyle(TableStyle(st));return t
def foot(can,doc):
 can.saveState();can.setStrokeColor(HexColor('#B0BEC5'));can.line(1.5*cm,1.18*cm,19.45*cm,1.18*cm);can.setFillColor(HexColor('#546E7A'));can.setFont('Helvetica',8);can.drawString(1.5*cm,.75*cm,'Veterinary Anaesthesiology | Pain Management and Local Anaesthesia');can.drawRightString(19.45*cm,.75*cm,'Page '+str(doc.page));can.restoreState()

doc=SimpleDocTemplate(OUT,pagesize=A4,leftMargin=1.5*cm,rightMargin=1.5*cm,topMargin=1.35*cm,bottomMargin=1.55*cm)
a=[]
a += [Spacer(1,1*cm),P('VETERINARY ANAESTHESIOLOGY','TitleX'),P('Pain Management and Local Anaesthesia','TitleX'),P('Easy-language notes with flow charts, tables, and exam points','SubX')]
a += [P('Learning objectives','H1X'),P('Understand pain, recognise it in animals, plan multimodal analgesia, explain local-anaesthetic action, select appropriate local and regional techniques, and prevent toxicity.'),flow(['Assess pain before the procedure','Prevent pain before tissue injury when possible','Use multimodal analgesia','Add local or regional anaesthesia','Reassess repeatedly and revise the plan'])]
a += [P('1. Pain: definition and importance','H1X'),P('<b>Pain</b> is an unpleasant sensory and emotional experience associated with actual or potential tissue damage. Animals may not show pain in the same way as people. Absence of crying does not mean absence of pain.'),tbl(['Why pain control matters','Effect of untreated pain'],[['Animal welfare','Pain causes fear, distress, reduced feeding, poor sleep, and poor quality of life.'],['Body response','Stress hormones can increase heart rate, blood pressure, oxygen consumption, and muscle breakdown.'],['Recovery','Pain reduces movement and appetite, may delay wound healing, and can prolong hospitalization.'],['Sensitization','Ongoing pain can make the nervous system more sensitive, leading to hyperalgesia or chronic pain.']], [5*cm,12*cm])]
a += [P('2. Types and pathways of pain','H1X'),tbl(['Type','Simple meaning','Examples'],[['Acute pain','Sudden pain with a clear recent cause','Surgery, trauma, burn, acute abdominal disease.'],['Chronic pain','Long-lasting pain, often continuing beyond normal healing','Osteoarthritis, cancer, chronic dental or spinal disease.'],['Nociceptive pain','Pain caused by stimulation of normal pain receptors','Incision, inflammation, bone injury.'],['Neuropathic pain','Pain due to injury or disease of nerves','Nerve trauma, spinal disease, amputation-related pain.'],['Inflammatory pain','Pain from inflammatory mediators sensitizing tissues','Surgical tissue injury, arthritis, infection.']], [3.3*cm,6.4*cm,7.3*cm])]
a += [P('Pain pathway','H2X'),flow(['Noxious stimulus: cut, crush, heat, inflammation','Transduction: pain receptors convert stimulus into nerve signal','Transmission: signal travels through peripheral nerve and spinal cord','Modulation: signals can be increased or reduced in spinal cord/brain','Perception: brain experiences pain'])]
a += [P('Important terms','H2X'),tbl(['Term','Meaning'],[['Nociception','Neural processing of a harmful stimulus. It can occur even when the animal is unconscious.'],['Analgesia','Relief or reduction of pain without necessarily causing unconsciousness.'],['Hyperalgesia','An exaggerated response to a painful stimulus.'],['Allodynia','Pain caused by a normally non-painful stimulus, such as light touch.'],['Central sensitization','Spinal cord/brain become more responsive after persistent noxious input, making pain harder to control.']], [4.4*cm,12.6*cm])]
a += [P('3. Recognising pain in animals','H1X'),P('Pain assessment should be performed before treatment, after treatment, and during recovery. Compare the animal’s behaviour to its normal behaviour whenever possible.'),tbl(['Area observed','Possible pain signs'],[['Behaviour','Hiding, reduced interaction, aggression, restlessness, guarding, altered sleep, reluctance to move.'],['Posture and movement','Lameness, stiffness, hunched posture, weight shifting, reluctance to lie down or rise.'],['Eating and grooming','Reduced appetite, decreased grooming in cats, altered chewing, reduced drinking.'],['Face and vocalization','Tense facial expression, grimace, dilated pupils, growling, crying, purring in some painful cats.'],['Physiological signs','Tachycardia, increased respiratory rate, hypertension, but these are nonspecific and must not be used alone.']], [5*cm,12*cm])]
a += [P('Pain assessment cycle','H2X'),flow(['Observe and score pain','Give appropriate treatment','Allow time for effect','Reassess using the same tool','Continue, reduce, or escalate treatment'])]
a += [PageBreak(),P('4. Principles of pain management','H1X'),P('Modern veterinary pain control is <b>proactive, pre-emptive, multimodal, and reassessed regularly</b>. Pre-emptive analgesia means providing analgesia before noxious stimulation, when possible, to reduce pain amplification.'),flow(['Expected painful procedure','Plan analgesia before surgery','Use drugs with different mechanisms plus local/regional technique','Reduce amount of each individual drug needed','Monitor effect and adverse effects','Continue analgesia into recovery and at home when required'])]
a += [P('Multimodal analgesia','H2X'),P('Multimodal analgesia combines methods that act at different points in the pain pathway. It improves analgesia while reducing dependence on a single drug and limiting dose-related adverse effects.'),tbl(['Method','Main role'],[['Opioids','Moderate to severe acute pain; often part of perioperative analgesia.'],['NSAIDs','Inflammatory pain; useful when hydration, kidney function, gastrointestinal status, and bleeding risk permit.'],['Local anaesthetics','Block nerve signal transmission at the surgical site or along a nerve.'],['Alpha-2 agonists','Sedation and analgesia, but may significantly affect heart rate and circulation.'],['Ketamine at analgesic doses','May reduce central sensitization and wind-up in selected patients.'],['Non-drug measures','Gentle handling, warm bedding, suitable positioning, wound support, physiotherapy, cold/heat when appropriate, and nursing care.']], [5*cm,12*cm])]
a += [P('Acute versus chronic pain: broad approach','H2X'),tbl(['Acute pain','Chronic pain'],[['Often due to surgery, trauma, or acute disease. Aim for rapid prevention and treatment.','Often needs long-term assessment, realistic function goals, owner monitoring, and periodic plan changes.'],['Frequently requires opioids, local/regional anaesthesia, and other perioperative drugs.','May require weight control, controlled exercise, rehabilitation, environmental adaptation, and selected medicines.'],['Reassess frequently during recovery.','Use validated chronic-pain tools and owner observations when available.']], [8.5*cm,8.5*cm])]
a += [P('5. Local and regional anaesthesia','H1X'),P('<b>Local anaesthesia</b> blocks sensation in a limited area without causing unconsciousness. <b>Regional anaesthesia</b> blocks nerve supply to a larger anatomical region, such as a limb, dental area, or lower abdomen. Both are commonly combined with sedation or general anaesthesia.'),tbl(['Technique','Where drug is placed','Typical purpose'],[['Topical','On skin or mucosa','Surface procedures, eye, airway, oral/nasal mucosa.'],['Infiltration','Into tissue around incision/wound','Skin incision, wound repair, line block.'],['Field block','Around the operative field','Interrupts nerves entering a surgical area.'],['Peripheral nerve block','Near a specific nerve or plexus','Dental, limb, head, trunk procedures.'],['Epidural / spinal regional technique','Near spinal nerves in vertebral canal','Caudal abdomen, pelvis, hindlimb, perineal procedures.'],['Intravenous regional anaesthesia','Into a limb vein distal to a tourniquet','Selected distal limb procedures; requires strict technique.']], [4.5*cm,6.2*cm,6.3*cm])]
a += [P('Benefits of local and regional techniques','H2X'),tbl(['Benefit','Why it helps'],[['Excellent analgesia','Stops nociceptive input near its source.'],['Lower general-anaesthetic requirement','May improve cardiovascular and respiratory stability by reducing inhalant or injectable drug requirements.'],['Smoother recovery','Less pain and often less dysphoria on waking.'],['Less systemic drug exposure','May reduce need for systemic opioids or other analgesics, though they may still be needed.'],['Pre-emptive effect','When used before incision, may reduce pain amplification.']], [5.5*cm,11.5*cm])]
a += [P('6. Local anaesthetic drugs and mechanism','H1X'),P('Common local anaesthetics in veterinary practice include lidocaine, bupivacaine, ropivacaine, and mepivacaine. Choice depends on desired onset, duration, site, need for motor block, and safety considerations.'),tbl(['Drug','General characteristics'],[['Lidocaine','Relatively rapid onset and intermediate duration. Commonly used for infiltration, nerve blocks, topical uses, and some antiarrhythmic applications.'],['Bupivacaine','Longer duration. Useful when prolonged postoperative analgesia is desired, but systemic toxicity can be more serious than with lidocaine.'],['Ropivacaine','Longer acting; may produce less motor block than bupivacaine in some uses and is often chosen for regional techniques.'],['Mepivacaine','Intermediate acting; commonly discussed in equine local/regional practice.']], [4*cm,13*cm])]
a += [P('Mechanism of action','H2X'),flow(['Local anaesthetic is deposited near nerve fibres','Non-ionized portion crosses nerve membrane','Drug binds voltage-gated sodium channels from inside','Sodium entry and action-potential propagation are blocked','Pain signal cannot travel to spinal cord and brain','Loss of sensation occurs in the blocked area'])]
a += [P('Order of blockade','H2X'),P('Small, rapidly conducting or pain-related fibres tend to be blocked before larger motor fibres. Clinically, pain and temperature sensation are often reduced before complete motor loss. The exact pattern varies with drug concentration, nerve size, location, and technique.')]
a += [PageBreak(),P('7. Factors affecting onset, quality, and duration of a block','H1X'),tbl(['Factor','Effect'],[['Drug properties','Lipid solubility, protein binding, pKa, concentration, and dose influence onset and duration.'],['Site of injection','Highly vascular sites absorb drug faster, shortening local action but increasing systemic exposure.'],['Tissue pH','Inflamed/infected tissue is acidic. More drug stays ionized and penetrates nerves poorly, so blocks may fail or be less effective.'],['Accuracy of placement','Drug must be deposited close enough to the target nerve or tissue plane.'],['Volume and concentration','Both matter. Use the smallest effective total dose and volume for the selected technique.'],['Vasoconstrictor addition','May reduce vascular uptake and prolong some blocks, but is not appropriate for every patient/site.']], [5.2*cm,11.8*cm])]
a += [P('Why a block may fail','H2X'),flow(['Incorrect target or needle placement','Not enough drug reaches nerve','Inflamed acidic tissue reduces penetration','Insufficient volume/concentration or insufficient onset time','Nerve supply is more complex than expected','Reassess anatomy and technique; do not repeatedly inject without calculating total safe dose'])]
a += [P('8. Common practical techniques','H1X'),P('The following are general educational descriptions. Exact landmarks, needle choice, concentration, volume, and maximum dose require species-specific training and a written calculation by the veterinarian.'),tbl(['Technique','General use','Important point'],[['Incisional infiltration / line block','Skin incision, wound repair, small superficial surgery','Inject in layers before incision; aspirate before injection and calculate total dose.'],['Ring block','Digits, tail, horn, teat, superficial circular structures','Inject around the base to interrupt nerve entry; avoid excessive tissue pressure.'],['Dental blocks','Oral surgery and tooth extraction','Blocks named sensory nerves supplying the maxilla or mandible. Aspiration and anatomy are essential.'],['Ophthalmic/periocular blocks','Selected eye or eyelid procedures','Use specialist anatomy and care: globe injury, haematoma, and pressure effects are possible.'],['Limb peripheral blocks','Distal limb or selected orthopaedic procedures','May be used alone or with general anaesthesia; assess motor block and protect the limb.'],['Epidural analgesia','Perineal, pelvic, hindlimb, caudal abdominal procedures','Strict asepsis, correct landmarking, dose/volume calculation, and cardiovascular monitoring are required.'],['Testicular/ovarian/abdominal wall techniques','Sterilization and abdominal surgery','Often combined with systemic analgesia and general anaesthesia.']], [4.3*cm,7.0*cm,5.7*cm])]
a += [P('Safe injection sequence','H2X'),flow(['Confirm patient, procedure, drug concentration, total dose, and target anatomy','Use aseptic technique and suitable restraint/sedation','Place needle at planned site','Aspirate before every incremental injection','Inject slowly in small increments while observing patient','Record drug, concentration, volume, site, and response','Monitor for block success and toxicity'])]
a += [P('9. Local anaesthetic systemic toxicity: LAST','H1X'),P('<b>LAST</b> means local anaesthetic systemic toxicity. It can result from excessive total dose, accidental intravascular injection, rapid absorption from highly vascular tissue, small body size, poor liver function, low protein concentration, or repeated injections.'),tbl(['Possible early signs','Progressive/severe signs'],[['Restlessness, twitching, tremors, agitation, hypersalivation, vomiting, altered behaviour','Seizures, severe CNS depression, hypotension, bradycardia/arrhythmias, cardiovascular collapse, cardiac arrest']], [8.5*cm,8.5*cm])]
a += [P('Response to suspected toxicity','H2X'),flow(['Stop injecting local anaesthetic immediately','Call for help and support airway, oxygenation, and ventilation','Monitor ECG, pulse, blood pressure, oxygenation, and temperature','Treat seizures and cardiovascular compromise according to emergency protocol','Use lipid-emulsion rescue where indicated by trained veterinary personnel and local protocol','Continue intensive monitoring because recurrence can occur'])]
a += [P('Prevention of toxicity','H2X'),tbl(['Action','Reason'],[['Calculate total dose in mg, not only volume','Different concentrations contain different total milligrams.'],['Add all injections together','A line block plus nerve block plus wound infiltration can exceed the safe total dose if not summed.'],['Aspirate and inject incrementally','Reduces risk of accidental intravascular injection.'],['Use lower doses in high-risk patients','Young, old, small, hypoproteinaemic, liver-diseased, or cardiovascularly compromised animals may require extra caution.'],['Use appropriate monitoring','Early recognition makes treatment more effective.']], [6.2*cm,10.8*cm])]
a += [P('10. Exam-ready summary','H1X'),flow(['Pain must be assessed, prevented where possible, treated, and reassessed','Use multimodal analgesia: combine methods with different mechanisms','Local anaesthetics block voltage-gated sodium channels and stop nerve impulse transmission','Local = small area; regional = larger anatomical territory','Choose drug and technique based on site, duration, patient, and procedure','Always calculate total dose, aspirate, inject incrementally, and watch for toxicity'])]
a += [P('Key message','H2X'),P('Effective pain management is a continuous process, not a single injection. For many surgical patients, a plan combining systemic analgesia, local or regional anaesthesia, gentle nursing, and repeated pain scoring provides better comfort and safer recovery than reliance on one drug alone.'),Spacer(1,8),P('<b>Safety note:</b> This document is for veterinary study. It intentionally does not provide a universal dose chart. Drug doses, concentrations, techniques, and rescue protocols differ by species, indication, product, local regulations, and patient condition, and must be determined by a qualified veterinarian.','NoteX'),Spacer(1,8),P('Study framework: 2022 AAHA Pain Management Guidelines for Dogs and Cats; AAHA Anaesthesia and Monitoring Guidelines; standard anaesthesia texts.','SX')]
doc.build(a,onFirstPage=foot,onLaterPages=foot)
print(OUT)

from reportlab.lib import colors
from reportlab.lib.enums import TA_CENTER
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, PageBreak
from reportlab.lib.colors import HexColor

OUT='/tmp/workspace/veterinary-premedication-dosage/output/Premedication_Drugs_and_Dosage_Concepts_Veterinary_Anaesthesiology.pdf'
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doc=SimpleDocTemplate(OUT,pagesize=A4,leftMargin=1.5*cm,rightMargin=1.5*cm,topMargin=1.35*cm,bottomMargin=1.55*cm)
a=[]
a += [Spacer(1,1*cm),P('VETERINARY ANAESTHESIOLOGY','T'),P('Premedication Drugs and Dosage Concepts','T'),P('Easy-language notes with flow charts, comparison tables, and safe calculation principles','Sub')]
a += [P('Learning objectives','H1x'),P('Define premedication, state its purposes, compare the major drug classes, recognize important adverse effects and reversals, and perform safe dose-concept calculations.'),flow(['Evaluate patient and procedure','Set goals: anxiolysis, sedation, analgesia, or restraint','Choose an individual combination and route','Calculate, check, label, and record all doses','Give drugs safely and monitor response','Adjust induction and recovery plan'])]
a += [P('1. What is premedication?','H1x'),P('<b>Premedication</b> is administration of drugs before induction of general anaesthesia or before a procedure. The selected drugs may provide calmness, sedation, analgesia, reduced secretions in selected cases, or smoother handling. Premedication is not a fixed recipe: it must be individualized.'),table(['Main purpose','Practical result'],[['Reduce fear, anxiety, and stress','Safer handling and less struggling.'],['Provide pre-emptive analgesia','Pain relief begins before tissue injury.'],['Reduce induction-drug requirement','Lower doses may improve induction stability.'],['Improve restraint','Useful for imaging, minor procedures, and difficult patients.'],['Facilitate smooth recovery','Less pain and agitation after the procedure.']], [6*cm,11*cm])]
a += [P('2. Choosing a premedication plan','H1x'),flow(['Patient: species, breed, age, temperament, ASA status, disease, current medicines','Procedure: pain level, duration, invasiveness, position, emergency/elective status','Drug properties: sedation, analgesia, cardiovascular and respiratory effects, reversibility','Available monitoring, airway support, and trained staff','Individual written plan with calculated doses'])]
a += [P('Key rule','H2x'),P('A sedative does not automatically provide analgesia. A calm animal can still feel pain. Painful procedures require an analgesic plan, usually including local or regional anaesthesia where appropriate.')]
a += [P('3. Major premedication drug classes','H1x'),table(['Class','Examples','Main actions','Key cautions'],[['Anticholinergics','Atropine, glycopyrrolate','Increase heart rate; reduce some vagal effects and secretions.','Not routine for every patient. May cause tachycardia, increase oxygen demand, and thicken secretions.'],['Phenothiazine tranquilizer','Acepromazine','Tranquilization; reduces anxiety; no analgesia.','Can cause vasodilation and hypotension. No specific reversal. Use caution in hypovolaemia or poor perfusion.'],['Benzodiazepines','Midazolam, diazepam','Anxiolysis, muscle relaxation, anticonvulsant effect; little direct analgesia.','May cause paradoxical excitement in healthy young animals if used alone. Diazepam injection has formulation and route considerations.'],['Butyrophenones','Azaperone, droperidol','Tranquilization, often species/protocol dependent.','Can cause cardiovascular effects and dysphoria; follow species-specific regulations.'],['Opioids','Morphine, methadone, fentanyl, buprenorphine, butorphanol','Analgesia with variable sedation; reduce nociceptive response.','Respiratory depression, bradycardia, vomiting, dysphoria or excitement can occur.'],['Alpha-2 agonists','Xylazine, medetomidine, dexmedetomidine, detomidine, romifidine','Marked sedation, analgesia, muscle relaxation.','Can cause bradycardia, vasoconstriction, reduced cardiac output, and vomiting. Use only after patient evaluation.']], [2.6*cm,3.5*cm,5.1*cm,5.8*cm])]
a += [PageBreak(),P('4. Anticholinergics','H1x'),P('Anticholinergics block muscarinic effects of acetylcholine. In anaesthesia they may be used to manage clinically important vagal bradycardia or selected excessive secretions. They should not be given automatically to every patient.'),table(['Drug','Useful points','Important concerns'],[['Atropine','Rapid onset and may be used when a fast anticholinergic effect is needed.','Tachycardia, increased myocardial oxygen requirement, thick secretions, reduced gut motility.'],['Glycopyrrolate','Longer-lasting anticholinergic effect and less penetration into the CNS.','Similar peripheral effects. Choice depends on clinical situation and protocol.']], [3*cm,7*cm,7*cm])]
a += [P('5. Sedatives and tranquilizers','H1x'),P('The term <b>sedation</b> means reduced awareness and activity. <b>Tranquilization</b> mainly decreases anxiety and reactivity. In clinical use, these effects overlap, but the drug class matters because analgesia and cardiovascular effects differ.'),P('Acepromazine','H2x'),table(['Point','Explanation'],[['Class','Phenothiazine tranquilizer.'],['Benefits','Reduces anxiety and may make handling calmer. Can be combined with an opioid.'],['Does it relieve pain?','No. Add an analgesic for painful procedures.'],['Adverse effects','Peripheral vasodilation and hypotension; prolonged effect in some patients; possible effects on temperature regulation.'],['Caution','Hypovolaemic, hypotensive, severely debilitated, or vasodilated animals need careful case-specific assessment.']], [4.5*cm,12.5*cm])]
a += [P('Benzodiazepines','H2x'),table(['Point','Explanation'],[['Main uses','Anxiolysis, muscle relaxation, seizure control, and co-induction. Often useful in compromised, geriatric, neonatal, or debilitated patients when combined appropriately.'],['Analgesia','No meaningful primary analgesic effect.'],['Potential advantage','Usually limited cardiovascular depression when appropriately used.'],['Possible problem','Healthy, young, excited animals may become more disinhibited or paradoxically excited if the drug is used alone.'],['Reversal','Flumazenil is a benzodiazepine antagonist and must be used with veterinary judgement.']], [4.5*cm,12.5*cm])]
a += [P('Butyrophenones','H2x'),P('This class includes drugs such as azaperone and droperidol. Their use varies by species and setting, especially in pigs and selected handling protocols. They can tranquillize but are not a substitute for analgesia. Veterinary direction, species-specific knowledge, and food-animal legal requirements are essential.')]
a += [P('6. Opioid analgesics','H1x'),P('Opioids act at opioid receptors in the brain, spinal cord, and peripheral tissues. They are important for acute surgical pain, but degree of analgesia, sedation, and duration differs among drugs and patients.'),table(['Group / example','General role','Clinical notes'],[['Full mu agonists: morphine, methadone, fentanyl, hydromorphone','Stronger analgesia for moderate to severe acute pain.','Often combined with a sedative/tranquilizer and local techniques. Monitor ventilation, heart rate, temperature, and behaviour.'],['Partial mu agonist: buprenorphine','Analgesia with a different receptor profile.','Often used in cats and for selected pain situations; onset and ceiling effects must be understood.'],['Kappa agonist/mu antagonist: butorphanol','Sedation with comparatively limited visceral/somatic analgesia versus full mu agonists.','May be suitable for mild pain or nonpainful procedures, but not adequate alone for major surgery.']], [4.7*cm,5.5*cm,6.8*cm])]
a += [P('Opioid adverse effects','H2x'),flow(['Dose, drug, species, and patient sensitivity influence response','Possible sedation or dysphoria/excitement','Bradycardia or altered respiratory pattern may occur','Nausea, vomiting, panting, altered temperature, reduced gut motility may occur','Monitor and treat clinically significant effects; do not remove analgesia without a replacement plan'])]
a += [PageBreak(),P('7. Alpha-2 adrenergic agonists','H1x'),P('Alpha-2 agonists provide strong sedation and analgesia. They reduce sympathetic outflow and can markedly change cardiovascular function. Their apparent blood pressure and pulse effects must be interpreted carefully.'),table(['Drug','Typical veterinary context','Important features'],[['Xylazine','Commonly discussed in large-animal and mixed-practice protocols.','Sedation and analgesia; species sensitivity differs greatly.'],['Medetomidine / dexmedetomidine','Common in small-animal sedation and premedication.','Potent sedation and analgesia; doses are small and require precise calculation.'],['Detomidine / romifidine','Important in equine practice.','Useful sedation in horses with species- and case-specific monitoring.']], [4.4*cm,6*cm,6.6*cm])]
a += [P('Expected cardiovascular pattern','H2x'),flow(['Alpha-2 agonist given','Peripheral vasoconstriction may initially increase blood pressure','Reflex bradycardia and reduced cardiac output can occur','Later vasodilation may lower blood pressure','Continuous assessment of perfusion, heart rhythm, blood pressure, and respiratory status is required'])]
a += [P('Reversal','H2x'),P('Atipamezole is used to reverse selected alpha-2 agonists. Reversal can shorten sedation, but it can also remove some analgesia. Before reversing, ensure pain is controlled by another appropriate method. Reversal decisions should be patient-specific.')]
a += [P('8. Combination premedication','H1x'),P('A combination is often preferred because each drug can contribute a different benefit. For example, an opioid can supply analgesia while a sedative reduces anxiety. When drugs are combined, lower doses of individual drugs may be sufficient, but adverse effects may also add together.'),table(['Example combination concept','Reason'],[['Opioid + acepromazine','Analgesia plus tranquilization. Monitor perfusion and blood pressure.'],['Opioid + benzodiazepine','Analgesia plus anxiolysis/muscle relaxation; can be useful in selected compromised patients.'],['Opioid + alpha-2 agonist','Strong sedation and analgesia in suitable patients; requires cardiovascular assessment and monitoring.'],['Sedative + local/regional anaesthesia','Reduces pain signals at source and may reduce general anaesthetic requirement.']], [6.3*cm,10.7*cm])]
a += [P('9. Dosage concepts and safe calculation','H1x'),P('Dose calculation is a safety process. It is not enough to remember a number. The clinician must verify the correct patient, drug, concentration, route, total dose, dilution, and compatibility.'),flow(['Weigh animal accurately in kg','Select veterinary-approved, patient-specific dose range and route','Calculate total amount needed in mg','Check product concentration in mg/mL','Convert milligrams to millilitres','Independently double-check calculation','Label syringe and document drug, dose, concentration, route, time, and response'])]
a += [P('Core formulas','H2x'),table(['Calculation','Formula'],[['Total amount (mg)','Dose (mg/kg) × body weight (kg)'],['Injection volume (mL)','Required amount (mg) ÷ product concentration (mg/mL)'],['Dilution check','Total drug amount remains the same; dilution changes volume and concentration, not total mg.'],['Microgram conversion','1 mg = 1000 micrograms (mcg or µg). Always confirm units before calculation.']], [6.2*cm,10.8*cm])]
a += [P('Worked calculation example only','H2x'),P('A 12 kg dog is prescribed a hypothetical drug dose of <b>0.2 mg/kg</b>. The product concentration is <b>2 mg/mL</b>.<br/>1. Required amount = 0.2 mg/kg × 12 kg = 2.4 mg.<br/>2. Injection volume = 2.4 mg ÷ 2 mg/mL = 1.2 mL.<br/>This is a mathematics example only, not a clinical dose recommendation.')]
a += [P('10. Common dose-calculation errors','H1x'),table(['Error','How to prevent it'],[['Using lb instead of kg','Use a reliable body weight in kg. 1 kg is approximately 2.2 lb.'],['Confusing mg with mcg','Write units clearly. A 1000-fold error can occur.'],['Reading concentration incorrectly','Check label: mg/mL, percentage, and total vial contents are not interchangeable.'],['Adding combination doses incorrectly','Calculate each drug separately. Review total effects, not just individual doses.'],['Forgetting route differences','The same drug may have different absorption, onset, and recommended ranges by route.'],['Using an old chart blindly','Check current formularies, product labels, patient status, and species-specific guidance.'],['Not adjusting induction','Premedication can lower induction requirement. Titrate induction drug to effect with airway support ready.']], [6.2*cm,10.8*cm])]
a += [PageBreak(),P('11. Monitoring after premedication','H1x'),table(['Observe','Why'],[['Level of sedation and response to handling','Confirms desired effect and identifies excessive sedation, excitement, or dysphoria.'],['Heart rate, rhythm, pulse and blood pressure','Detects bradycardia, vasoconstriction, hypotension, or reduced perfusion.'],['Respiratory rate, effort and oxygenation','Detects respiratory depression or airway compromise.'],['Temperature','Sedated animals may lose heat; some drugs alter thermoregulation.'],['Pain score','Sedation can hide pain behaviour. Use procedure knowledge, posture, and validated pain tools.'],['Vomiting/regurgitation risk and airway','Plan safe positioning and intubation.']], [6.4*cm,10.6*cm])]
a += [P('12. Reversal and antagonism: key principles','H1x'),flow(['Recognize concerning adverse effect or need for faster recovery','First ensure airway, oxygenation, perfusion, temperature, and pain are addressed','Select an antagonist only when appropriate for the drug and patient','Do not reverse analgesia without providing another analgesic plan','Continue monitoring because re-sedation or pain can emerge'])]
a += [P('Major antagonists','H2x'),table(['Drug class','Antagonist / reversal concept','Key warning'],[['Alpha-2 agonists','Atipamezole for selected alpha-2 protocols.','May remove analgesia as well as sedation.'],['Opioids','Naloxone can antagonize opioid effects.','Can abruptly remove analgesia and precipitate pain or dysphoria.'],['Benzodiazepines','Flumazenil can antagonize benzodiazepine effects.','Use thoughtfully, especially in animals receiving benzodiazepines for seizure control.'],['Acepromazine','No specific reversal.','Supportive care and time are required if excessive effect occurs.']], [4.3*cm,6.7*cm,6*cm])]
a += [P('Exam-ready summary','H1x'),flow(['Premedication reduces stress, supports analgesia, improves handling, and reduces induction requirement','Patient and procedure determine drug choice','Acepromazine tranquillizes but does not provide analgesia','Benzodiazepines give anxiolysis and muscle relaxation but little direct analgesia','Opioids are central analgesics; monitor for respiratory and behavioural effects','Alpha-2 agonists provide sedation and analgesia but can markedly alter circulation','Correct dose = dose per kg × body weight; volume = required mg ÷ mg/mL','Always calculate, independently check, label, monitor, record, and reassess'])]
a += [Spacer(1,8),P('<b>Safety note:</b> This is an educational study document. It does not provide a universal veterinary dosage chart. Drug dose, route, concentration, withdrawal period, combinations, and reversal protocol vary with species, product label, indication, patient status, and local law. Use current veterinary formularies and a qualified veterinarian’s patient-specific plan.','N'),P('Study framework: AAHA Anaesthesia and Monitoring Guidelines and AAHA premedication/sedation reference materials; standard anaesthesia texts.','S')]
doc.build(a,onFirstPage=foot,onLaterPages=foot)
print(OUT)

from reportlab.lib import colors
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.enums import TA_CENTER
from reportlab.lib.units import cm
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, PageBreak
from reportlab.lib.colors import HexColor

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s.add(ParagraphStyle(name='SubX',parent=s['Normal'],fontSize=10,leading=14,alignment=TA_CENTER,textColor=HexColor('#52616B'),spaceAfter=15))
s.add(ParagraphStyle(name='H1X',parent=s['Heading1'],fontName='Helvetica-Bold',fontSize=14.5,leading=18,textColor=HexColor('#12355B'),spaceBefore=10,spaceAfter=6))
s.add(ParagraphStyle(name='H2X',parent=s['Heading2'],fontName='Helvetica-Bold',fontSize=11.3,leading=14,textColor=HexColor('#15616D'),spaceBefore=7,spaceAfter=4))
s.add(ParagraphStyle(name='BX',parent=s['BodyText'],fontSize=9.2,leading=12.3,spaceAfter=5))
s.add(ParagraphStyle(name='SX',parent=s['BodyText'],fontSize=8.1,leading=10.2,spaceAfter=1))
s.add(ParagraphStyle(name='FX',parent=s['BodyText'],fontName='Helvetica-Bold',fontSize=9,leading=12,alignment=TA_CENTER,textColor=HexColor('#12355B')))
s.add(ParagraphStyle(name='NoteX',parent=s['BodyText'],fontName='Helvetica-Oblique',fontSize=8.4,leading=10.8,textColor=HexColor('#4B5563')))
P=lambda x,style='BX':Paragraph(x,s[style])
def tab(head, rows, widths):
 d=[[P(x,'SX') for x in head]]+[[P(x,'SX') for x in r] for r in rows]
 t=Table(d,colWidths=widths,repeatRows=1,hAlign='LEFT')
 t.setStyle(TableStyle([('BACKGROUND',(0,0),(-1,0),HexColor('#12355B')),('TEXTCOLOR',(0,0),(-1,0),colors.white),('FONTNAME',(0,0),(-1,0),'Helvetica-Bold'),('GRID',(0,0),(-1,-1),.35,HexColor('#AEBFC8')),('VALIGN',(0,0),(-1,-1),'TOP'),('ROWBACKGROUNDS',(0,1),(-1,-1),[colors.white,HexColor('#F0F8F8')]),('LEFTPADDING',(0,0),(-1,-1),5),('RIGHTPADDING',(0,0),(-1,-1),5),('TOPPADDING',(0,0),(-1,-1),4),('BOTTOMPADDING',(0,0),(-1,-1),4)]));return t
def flow(items):
 data=[]
 for i,x in enumerate(items):
  data.append([P(x,'FX')])
  if i<len(items)-1:data.append([P('&#8595;','FX')])
 t=Table(data,colWidths=[17*cm],hAlign='CENTER')
 sty=[('BOX',(0,0),(-1,-1),.7,HexColor('#69AEBE')),('BACKGROUND',(0,0),(-1,-1),HexColor('#EFF8F8')),('LEFTPADDING',(0,0),(-1,-1),7),('RIGHTPADDING',(0,0),(-1,-1),7),('TOPPADDING',(0,0),(-1,-1),4),('BOTTOMPADDING',(0,0),(-1,-1),4)]
 for i in range(1,len(data),2):sty.append(('BACKGROUND',(0,i),(0,i),colors.white))
 t.setStyle(TableStyle(sty));return t
def footer(c,d):
 c.saveState(); c.setStrokeColor(HexColor('#B0BEC5')); c.line(1.5*cm,1.15*cm,19.45*cm,1.15*cm);c.setFillColor(HexColor('#546E7A'));c.setFont('Helvetica',8);c.drawString(1.5*cm,.72*cm,'Veterinary Anaesthesiology | General, Inhalation and Dissociative Anaesthesia');c.drawRightString(19.45*cm,.72*cm,'Page '+str(d.page));c.restoreState()
D=SimpleDocTemplate(out,pagesize=A4,leftMargin=1.5*cm,rightMargin=1.5*cm,topMargin=1.35*cm,bottomMargin=1.5*cm)
a=[]
a += [Spacer(1,.8*cm),P('VETERINARY ANAESTHESIOLOGY','TitleX'),P('General, Inhalation and Dissociative Anaesthesia','TitleX'),P('Easy-language study notes with flow charts, tables, and exam points','SubX')]
a += [P('Learning objectives','H1X'),P('Define general and dissociative anaesthesia, explain induction and maintenance, describe inhalation systems and volatile agents, identify monitoring requirements, and compare the main methods.'),P('1. General anaesthesia: definition','H1X'),P('<b>General anaesthesia</b> is a controlled, reversible state in which the animal is unconscious and does not perceive the procedure. A good anaesthetic plan also provides analgesia, muscle relaxation as needed, physiological support, and a safe recovery.'),flow(['Preanaesthetic assessment and stabilization','Premedication plus analgesic plan','Induction and airway control','Maintenance: inhalant, injectable, or combined technique','Continuous monitoring and support','Recovery, continued analgesia, and reassessment'])]
a += [P('Main components','H2X'),tab(['Component','Meaning'],[['Unconsciousness','Loss of awareness and response to surroundings.'],['Analgesia','Relief of pain. Unconsciousness alone does not ensure analgesia.'],['Muscle relaxation','Facilitates intubation and surgery when needed.'],['Autonomic stability','Control of harmful sympathetic responses while maintaining perfusion and ventilation.']], [5*cm,12*cm])]
a += [P('2. Stages and planes: simple clinical idea','H1X'),P('Older descriptions divide general anaesthesia into stages. In daily veterinary practice, the important task is to judge whether the animal is too light, at an appropriate surgical depth, or too deep. Anaesthetic depth must always be interpreted together with blood pressure, breathing, pulse, capnography, oxygenation, temperature, and the surgical stimulus.'),tab(['Depth','Typical observation','Action'],[['Too light','Movement, purposeful response, jaw tension, increased heart rate or blood pressure, response to incision.','Check pain and stimulation; provide analgesia or carefully adjust anaesthetic as appropriate.'],['Suitable surgical depth','No purposeful movement; adequate jaw relaxation; stable physiological variables; no excessive depression.','Continue vigilant monitoring and titrate to effect.'],['Too deep','Weak pulse, low pressure, slow or shallow breathing, poor reflexes, marked hypothermia.','Reduce anaesthetic delivery, support oxygenation/ventilation/circulation, and investigate causes.']], [3.2*cm,8*cm,5.8*cm])]
a += [P('3. Methods of induction','H1X'),tab(['Method','Examples / role','Advantages and limitations'],[['Intravenous induction','Propofol, alfaxalone, ketamine combinations, etomidate in selected patients.','Rapid and controlled when IV access is present. Drugs should be titrated to effect because premedication changes required dose.'],['Inhalation induction','Mask or chamber delivery of volatile agent, mainly in selected small animals/exotics.','Avoids an injection initially, but may cause stress, environmental contamination, and slower airway control.'],['Intramuscular induction','Sedative-opioid-ketamine or tiletamine/zolazepam protocols in selected patients.','Useful when restraint/IV access is difficult. Depth and recovery are less easily adjusted than with inhalation.']], [3.5*cm,6*cm,7.5*cm])]
a += [PageBreak(),P('4. Maintenance of general anaesthesia','H1X'),P('Maintenance may be achieved with volatile anaesthetic in oxygen, intermittent injectable drugs, total intravenous anaesthesia (TIVA), or a balanced combination. The goal is the lowest effective concentration or dose while pain is treated using multimodal analgesia and local/regional techniques.'),tab(['Technique','Strengths','Limitations'],[['Inhalation maintenance','Rapidly adjustable depth; exhaled agent is removed via lungs; useful for longer procedures.','Needs machine, oxygen, scavenging, airway management, and careful ventilation/perfusion monitoring.'],['TIVA','No vaporizer needed; can reduce operating-room pollution; useful in some short or field settings.','Requires reliable IV access, accurate infusion/dosing, and awareness of accumulation and delayed recovery.'],['Balanced anaesthesia','Combines sedatives, opioids, local blocks, NSAIDs where suitable, and lower anaesthetic dose.','Requires careful planning because drug effects and adverse effects may add.']], [3.6*cm,6.7*cm,6.7*cm])]
a += [P('5. Inhalation anaesthesia','H1X'),P('Inhalation anaesthesia uses a volatile liquid that is vaporized and delivered with oxygen through a breathing system. The animal absorbs vapour through the lungs, and most drug leaves by exhalation after the vaporizer is turned off.'),flow(['Oxygen source and flowmeter','Vaporizer converts liquid volatile agent to controlled vapour','Breathing circuit carries gas to the animal','Animal inhales: alveoli to blood to brain','Anaesthetic depth is adjusted by vaporizer setting and delivery','At the end: vaporizer off, fresh gas continues, animal exhales agent'])]
a += [P('Key equipment','H2X'),tab(['Part','Function'],[['Oxygen source and pressure system','Supplies oxygen safely to the machine.'],['Flowmeter','Sets fresh-gas flow.'],['Vaporizer','Adds a known concentration of volatile anaesthetic to carrier gas. Use only the correct agent-specific vaporizer.'],['Breathing circuit','Delivers fresh gas and removes exhaled gas. Choice depends on patient size and fresh-gas flow.'],['Carbon dioxide absorber','In rebreathing systems, removes exhaled carbon dioxide.'],['Reservoir bag','Stores gas, allows manual ventilation, and gives information about respiration.'],['Scavenging system','Removes waste anaesthetic gas from the workplace.']], [5.5*cm,11.5*cm])]
a += [P('6. Types of breathing systems','H1X'),tab(['System','Simple description','Common use / caution'],[['Non-rebreathing system','Fresh gas flow is high enough to flush exhaled carbon dioxide from circuit.','Often useful for small animals and very small patients. Higher gas use and heat/moisture loss can occur.'],['Rebreathing circle system','Carbon dioxide absorber permits rebreathing after CO2 removal.','Usually efficient for larger patients and longer procedures; resistance and equipment dead space must suit patient size.']], [4.4*cm,7*cm,6.6*cm])]
a += [P('7. Volatile inhalant agents','H1X'),tab(['Agent','General properties','Important points'],[['Isoflurane','Common volatile maintenance agent; relatively low metabolism.','Dose-dependent respiratory and cardiovascular depression can occur. Pungency makes mask induction less pleasant.'],['Sevoflurane','Less pungent and allows fairly rapid changes in depth.','Can be useful for inhalation induction in selected cases; may be more costly.'],['Desflurane','Very rapid change in alveolar concentration due to low blood solubility.','Requires a specialized heated vaporizer; pungent and often less practical in routine veterinary use.'],['Nitrous oxide','Weak anaesthetic alone but may reduce requirement for other agents in some settings.','Not sufficient as sole general anaesthetic; environmental and equipment considerations apply.']], [3.4*cm,7.3*cm,7.3*cm])]
a += [PageBreak(),P('8. Advantages and disadvantages of inhalation anaesthesia','H1X'),tab(['Advantages','Limitations'],[['Anaesthetic depth can be adjusted quickly.','Requires machine, oxygen supply, trained staff, and scavenging.'],['Most volatile agent is eliminated by lungs, giving controllable recovery.','Volatile agents can depress breathing and blood pressure in a dose-related manner.'],['Useful for maintenance of longer procedures.','Mask/chamber induction may be stressful and exposes staff to waste gas.'],['Endotracheal intubation allows airway control and oxygen delivery.','Equipment malfunction or depleted oxygen can become emergencies.'],['Can be combined with analgesics and local blocks to reduce required vapour.','Poor analgesia if used alone: volatile agents do not replace a pain plan.']], [8.5*cm,8.5*cm])]
a += [P('9. Uptake and recovery: blood-gas solubility concept','H1X'),P('A volatile agent must move from alveoli into blood and then brain. A lower blood-gas solubility generally allows the alveolar and brain concentration to change more quickly. Ventilation, cardiac output, inspired concentration, and lung function also affect speed of induction and recovery.'),flow(['Higher inspired concentration and effective ventilation can speed rise of alveolar concentration','Blood carries agent to the brain','Depth changes as brain partial pressure changes','Vaporizer is turned off','Fresh gas and ventilation remove agent through lungs','Brain concentration falls and recovery begins'])]
a += [P('10. Dissociative anaesthesia','H1X'),P('<b>Dissociative anaesthesia</b> is a distinct anaesthetic state in which the animal may appear disconnected from its surroundings. It differs from the quiet unconsciousness typical of many GABA-acting anaesthetics. Ketamine is the major veterinary example; tiletamine is another dissociative agent, commonly combined with zolazepam.'),tab(['Drug','General use','Important features'],[['Ketamine','Induction, chemical restraint, short procedures, and analgesic adjunct in multimodal plans.','NMDA receptor antagonism; tends to preserve some reflexes and muscle tone. Usually combine with a benzodiazepine, alpha-2 agonist, opioid, or other drug to improve relaxation and recovery.'],['Tiletamine-zolazepam','Injectable combination used for restraint and anaesthesia in selected species.','Tiletamine is dissociative; zolazepam is benzodiazepine. Recovery can be prolonged or variable in some species and protocols.']], [4*cm,6.4*cm,7.6*cm])]
a += [P('11. How dissociative agents act','H1X'),flow(['Ketamine or tiletamine enters CNS','Blocks NMDA-type glutamate receptor activity','Alters processing of sensory input and produces dissociation','Provides anaesthesia with variable analgesia and characteristic muscle tone','Combine with other agents to improve sedation, relaxation, analgesia, and recovery quality'])]
a += [P('12. Clinical effects of ketamine-based anaesthesia','H1X'),tab(['System','Expected effect / clinical relevance'],[['Central nervous system','Dissociation, analgesia, amnesia, and increased muscle tone. Eyes may remain open and reflexes may persist, so appearance alone does not indicate adequate surgical depth.'],['Cardiovascular','Indirect sympathetic stimulation may increase heart rate and blood pressure in some patients. In severely depleted catecholamine states, direct myocardial depression may be more evident.'],['Respiratory','Breathing may be better preserved than with some agents, but respiratory depression or apnoea can still occur, especially with combinations or rapid IV administration.'],['Musculoskeletal','Rigidity and poor relaxation can occur if used alone. Combine appropriately for intubation or surgery.'],['Recovery','May include paddling, dysphoria, vocalization, or hypersensitivity to stimulation. Quiet, dim recovery conditions are helpful.']], [4.2*cm,12.8*cm])]
a += [PageBreak(),P('13. Uses and cautions of dissociative techniques','H1X'),tab(['Situation','Why it may be useful','Caution'],[['Difficult restraint or field setting','IM combinations can permit handling when IV access is not initially possible.','Preparation, oxygen, monitoring, rescue equipment, and a recovery plan are still necessary.'],['Short painful procedures','Can form part of a multimodal protocol with opioid/local analgesia.','Do not assume dissociation alone gives adequate pain relief for every surgery.'],['Hypotensive patient','May be considered in selected patients because sympathetic stimulation may support circulation.','Underlying disease and catecholamine depletion change the response. Assess individually.'],['Head, eye, or seizure concerns','Use requires case-specific judgement.','Avoid simplistic rules. Consult current veterinary references and tailor to the diagnosis.']], [4.1*cm,6.4*cm,6.5*cm])]
a += [P('14. Monitoring of any general anaesthetic','H1X'),P('Monitoring is needed regardless of whether maintenance is inhalant, injectable, or dissociative. A trained person should focus on the animal and interpret trends, not just record machine numbers.'),tab(['Category','Assess / monitor'],[['Depth and CNS','Jaw tone, eye position and reflexes as appropriate, response to stimulation, purposeful movement, drug history.'],['Circulation','Heart rate, pulse quality, rhythm/ECG where indicated, blood pressure, mucous membranes, capillary refill, blood loss.'],['Oxygenation','Pulse oximetry, mucous membrane colour, inspired oxygen where available.'],['Ventilation','Respiratory rate and pattern, chest movement, capnography/end-tidal CO2 where available, manual assessment of bag.'],['Temperature','Core temperature and active warming as required.'],['Record keeping','Record values, drug changes, fluid therapy, complications, and interventions at regular intervals.']], [4.4*cm,12.6*cm])]
a += [P('Troubleshooting flow chart','H2X'),flow(['Unexpected physiological change: low blood pressure, poor oxygenation, hypercapnia, bradycardia, tachycardia, hypothermia, or abnormal depth','Check animal first: airway, breathing, circulation, depth, temperature, blood loss, surgical stimulation','Check equipment: oxygen source, circuit connection, vaporizer, tubing, absorber, monitors','Reduce excessive anaesthetic if appropriate and provide indicated support','Communicate with surgeon/team, record event, and continue close reassessment'])]
a += [P('15. Comparison for examinations','H1X'),tab(['Feature','Inhalation anaesthesia','Dissociative anaesthesia'],[['Main delivery','Volatile vapour through lungs and breathing system.','Usually injectable ketamine or tiletamine-based protocol.'],['Control during maintenance','Very adjustable by vaporizer setting and ventilation.','Less easily adjusted after IM dose; IV infusion/boluses offer more control.'],['Elimination','Mostly exhaled through lungs.','Metabolism and excretion depend on drug and species.'],['Muscle tone','Usually decreased at surgical depth, though varies with protocol.','Often increased unless combined with relaxant/sedative drugs.'],['Analgesia','Volatile agents alone are not enough for surgical analgesia.','Ketamine has analgesic properties but still needs multimodal planning for many procedures.'],['Key risk','Dose-dependent respiratory and cardiovascular depression.','Variable recovery, rigidity, excitation, and cardiovascular response depending on patient state.']], [3.7*cm,6.65*cm,6.65*cm])]
a += [P('Exam-ready summary','H1X'),flow(['General anaesthesia is a reversible state of unconsciousness with planned analgesia, safety, support, and recovery','Inhalation anaesthesia is highly adjustable and mainly eliminated through lungs','Volatile agents require a machine, circuit, oxygen, scavenging, airway management, and monitoring','Dissociative anaesthesia is characterized by altered sensory processing; ketamine and tiletamine are key examples','Ketamine is often combined with other drugs for relaxation, analgesia, and smoother recovery','Every method requires monitoring of depth, circulation, oxygenation, ventilation, temperature, and recovery'])]
a += [Spacer(1,7),P('<b>Safety note:</b> Educational notes only. Drug selection, concentration, delivery settings, and protocol details must be determined by a qualified veterinarian using current species-specific references, product labels, patient assessment, and local regulations.','NoteX'),P('Reference framework: 2020 AAHA Anaesthesia and Monitoring Guidelines for Dogs and Cats; standard anaesthesia textbooks.','SX')]
D.build(a,onFirstPage=footer,onLaterPages=footer)
print(out)

from reportlab.lib import colors
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.enums import TA_CENTER
from reportlab.lib.units import cm
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, PageBreak
from reportlab.lib.colors import HexColor
out='/tmp/workspace/veterinary-emergencies-reversal/output/Anaesthetic_Emergencies_and_Reversal_Agents_Veterinary_Anaesthesiology.pdf'
s=getSampleStyleSheet()
s.add(ParagraphStyle(name='T',parent=s['Title'],fontName='Helvetica-Bold',fontSize=19,leading=23,alignment=TA_CENTER,textColor=HexColor('#7A1F1F'),spaceAfter=8))
s.add(ParagraphStyle(name='ST',parent=s['Normal'],fontSize=10,leading=14,alignment=TA_CENTER,textColor=HexColor('#555555'),spaceAfter=14))
s.add(ParagraphStyle(name='H1x',parent=s['Heading1'],fontName='Helvetica-Bold',fontSize=14,leading=18,textColor=HexColor('#7A1F1F'),spaceBefore=9,spaceAfter=5))
s.add(ParagraphStyle(name='H2x',parent=s['Heading2'],fontName='Helvetica-Bold',fontSize=11,leading=14,textColor=HexColor('#A14242'),spaceBefore=7,spaceAfter=4))
s.add(ParagraphStyle(name='B',parent=s['BodyText'],fontSize=9.1,leading=12.2,spaceAfter=5))
s.add(ParagraphStyle(name='S',parent=s['BodyText'],fontSize=8,leading=10.1,spaceAfter=1))
s.add(ParagraphStyle(name='F',parent=s['BodyText'],fontName='Helvetica-Bold',fontSize=8.7,leading=11.4,alignment=TA_CENTER,textColor=HexColor('#671C1C')))
s.add(ParagraphStyle(name='N',parent=s['BodyText'],fontName='Helvetica-Oblique',fontSize=8.2,leading=10.5,textColor=HexColor('#4F4F4F')))
P=lambda x,n='B':Paragraph(x,s[n])
def tab(h,rows,w):
 d=[[P(x,'S') for x in h]]+[[P(x,'S') for x in r] for r in rows]
 t=Table(d,colWidths=w,repeatRows=1,hAlign='LEFT');t.setStyle(TableStyle([('BACKGROUND',(0,0),(-1,0),HexColor('#7A1F1F')),('TEXTCOLOR',(0,0),(-1,0),colors.white),('FONTNAME',(0,0),(-1,0),'Helvetica-Bold'),('GRID',(0,0),(-1,-1),.35,HexColor('#C8A8A8')),('VALIGN',(0,0),(-1,-1),'TOP'),('ROWBACKGROUNDS',(0,1),(-1,-1),[colors.white,HexColor('#FFF4F2')]),('LEFTPADDING',(0,0),(-1,-1),5),('RIGHTPADDING',(0,0),(-1,-1),5),('TOPPADDING',(0,0),(-1,-1),4),('BOTTOMPADDING',(0,0),(-1,-1),4)]));return t
def flow(items):
 d=[]
 for i,x in enumerate(items):
  d.append([P(x,'F')]);
  if i<len(items)-1:d.append([P('&#8595;','F')])
 t=Table(d,colWidths=[17*cm],hAlign='CENTER');st=[('BOX',(0,0),(-1,-1),.7,HexColor('#C76B63')),('BACKGROUND',(0,0),(-1,-1),HexColor('#FFF3F1')),('LEFTPADDING',(0,0),(-1,-1),7),('RIGHTPADDING',(0,0),(-1,-1),7),('TOPPADDING',(0,0),(-1,-1),4),('BOTTOMPADDING',(0,0),(-1,-1),4)]
 for i in range(1,len(d),2):st.append(('BACKGROUND',(0,i),(0,i),colors.white))
 t.setStyle(TableStyle(st));return t
def foot(c,d):
 c.saveState();c.setStrokeColor(HexColor('#D3B2AF'));c.line(1.5*cm,1.15*cm,19.45*cm,1.15*cm);c.setFillColor(HexColor('#5B4A4A'));c.setFont('Helvetica',8);c.drawString(1.5*cm,.72*cm,'Veterinary Anaesthesiology | Anaesthetic Emergencies and Reversal Agents');c.drawRightString(19.45*cm,.72*cm,'Page '+str(d.page));c.restoreState()
D=SimpleDocTemplate(out,pagesize=A4,leftMargin=1.5*cm,rightMargin=1.5*cm,topMargin=1.35*cm,bottomMargin=1.5*cm)
a=[Spacer(1,.7*cm),P('VETERINARY ANAESTHESIOLOGY','T'),P('Anaesthetic Emergencies and Reversal Agents','T'),P('Easy-language study notes with emergency flow charts, tables, and safety points','ST')]
a += [P('Purpose of this chapter','H1x'),P('An <b>anaesthetic emergency</b> is a sudden life-threatening change during sedation, anaesthesia, or recovery. The first priorities are recognition, calling for help, giving oxygen, supporting ventilation and circulation, reducing excessive anaesthetic effect when appropriate, and treating the underlying cause.'),flow(['Recognize abnormal trend or clinical sign','Call for help and stop/limit the triggering stimulus','Assess airway, breathing, circulation, depth, and temperature','Give oxygen and immediate physiological support','Check equipment and drugs','Treat likely cause; use reversal only when indicated','Reassess continuously and document the event'])]
a += [P('1. Emergency preparation prevents delay','H1x'),tab(['Before every anaesthetic event','Why it matters'],[['Trained staff member focused on the patient','Early recognition is more effective than rescue after collapse.'],['Oxygen source, airway devices, suction, bag/ventilator checked','Allows immediate airway control and assisted ventilation.'],['IV catheter, fluids, emergency drug access','Permits rapid treatment and sampling.'],['Monitoring and audible alarms active','Detects falling blood pressure, hypoxaemia, hypoventilation, temperature loss, and rhythm changes.'],['Written checklist and resuscitation plan','Reduces omission during stressful situations.']], [8*cm,9*cm])]
a += [P('2. Universal rapid assessment: ABCDE','H1x'),tab(['Step','What to check','Immediate general action'],[['A - Airway','Tube patency, correct placement, obstruction, kinking, secretions, regurgitation.','Open/secure airway; suction if needed; verify tube and circuit.'],['B - Breathing','Chest movement, respiratory rate, SpO2, ETCO2, reservoir bag, oxygen supply.','Give oxygen; assist or control ventilation if inadequate.'],['C - Circulation','Pulse, heart rate/rhythm, blood pressure, mucous membranes, blood loss.','Reduce excessive anaesthetic when appropriate; treat cause and support perfusion.'],['D - Depth/drugs','Anaesthetic depth, recent doses, possible overdose, painful stimulus.','Adjust vapour/infusion carefully; consider indicated antagonist only after review.'],['E - Everything else','Temperature, glucose, electrolytes, equipment, positioning, surgical complications.','Correct identifiable problem and keep reassessing.']], [2.2*cm,7.4*cm,7.4*cm])]
a += [PageBreak(),P('3. Common anaesthetic emergencies','H1x'),tab(['Emergency','Recognition','Immediate priorities'],[['Hypoxaemia','Low SpO2, cyanosis, poor pulse oximeter waveform, distress or collapse.','Oxygen; assess airway/tube/circuit; confirm ventilation; investigate lung disease, atelectasis, shunt, or equipment failure.'],['Hypoventilation / hypercapnia','Slow/shallow breathing, rising ETCO2, respiratory acidosis, delayed recovery.','Assist ventilation; reduce excessive respiratory-depressant drugs when appropriate; assess airway and circuit.'],['Hypotension','Low blood-pressure trend, weak pulses, prolonged CRT, poor perfusion.','Confirm measurement; reduce anaesthetic depth if excessive; evaluate blood loss, dehydration, vasodilation, cardiac disease; provide case-appropriate support.'],['Bradycardia','Slow heart rate with poor perfusion, hypotension, ECG change.','Check depth, oxygenation, blood pressure, vagal stimulation, drug effects, and electrolytes. Treat cause first.'],['Tachycardia','Increased HR, possible pressure change or arrhythmia.','Do not assume pain alone: check hypoxaemia, hypercapnia, hypovolaemia, depth, temperature, drugs, and surgical stimulation.'],['Hypothermia','Falling core temperature, slow recovery, bradycardia, coagulopathy risk.','Active warming, dry insulation, warm fluids when indicated, monitor temperature trend.'],['Hyperthermia','Rapid temperature rise, tachycardia, rigidity or abnormal CO2 depending on cause.','Stop trigger, cool safely, oxygenate/ventilate, investigate causes urgently.']], [3*cm,6.7*cm,7.3*cm])]
a += [P('4. Hypotension: simple troubleshooting flow chart','H1x'),flow(['Low blood pressure reading or poor perfusion','Confirm cuff size/placement or direct measurement; examine pulse and trend','Assess anaesthetic depth: reduce volatile agent or injectable delivery if too deep','Check blood loss, hydration, positioning, heart rhythm, temperature, ventilation, and surgical traction','Provide case-appropriate oxygen, fluid/blood support, and cardiovascular therapy under veterinary direction','Repeat measurement frequently and record response'])]
a += [P('Important principle','H2x'),P('Treating a monitor value without finding the cause can be harmful. For example, a low pressure reading can result from too much anaesthetic, haemorrhage, poor venous return, vasodilation, low cardiac output, measurement error, or a combination.')]
a += [P('5. Airway obstruction, regurgitation and aspiration','H1x'),tab(['Problem','Key actions'],[['Tube obstruction/kink/disconnection','Provide oxygen, disconnect if circuit is suspected, inspect/replace tube, ventilate manually if required.'],['Regurgitation','Protect airway with cuffed tube if in place; position to reduce aspiration risk; suction mouth/pharynx; inform team and monitor closely.'],['Suspected aspiration','Maintain oxygenation and ventilation; evaluate respiratory status and follow veterinary diagnostic/treatment plan.']], [6*cm,11*cm])]
a += [P('6. Local anaesthetic systemic toxicity, LAST','H1x'),P('Toxicity can follow excessive total dose, accidental intravascular injection, rapid absorption from vascular sites, or reduced clearance. Prevention includes calculating the total dose before injecting, aspirating before incremental injection, using the lowest effective dose, and monitoring the animal.'),tab(['Possible signs','Response principles'],[['CNS changes: agitation, tremor, twitching, seizures, unexpected depression.','Stop local anaesthetic administration; call for help; secure airway, give oxygen, support ventilation and circulation.'],['Cardiovascular changes: arrhythmia, hypotension, cardiovascular collapse.','Treat as a critical emergency with resuscitation and advanced veterinary guidance.'],['Prevention','Calculate all sources of local anaesthetic, inject incrementally, aspirate, communicate the total dose, and keep emergency equipment immediately available.']], [7*cm,10*cm])]
a += [PageBreak(),P('7. Cardiopulmonary arrest: basic team response','H1x'),P('Cardiopulmonary arrest means absent effective circulation and breathing. Start the clinic or hospital CPR protocol immediately. A designated leader should assign roles, maintain high-quality chest compressions, manage airway and ventilation, assess rhythm, give indicated drugs, and search for reversible causes.'),flow(['Recognize unresponsive animal with absent/ineffective pulse and breathing','Call for emergency team; start high-quality chest compressions immediately','Secure airway and provide oxygen/ventilation as protocol directs','Attach ECG and monitor; establish IV/IO access','Leader assesses rhythm and possible reversible causes','Continue cycles of CPR with reassessment and documented actions','After return of circulation: intensive monitoring, oxygenation, blood pressure and temperature support'])]
a += [P('Reversible causes to consider','H2x'),tab(['Category','Examples'],[['Oxygenation / ventilation','Hypoxaemia, hypercapnia, airway/circuit failure.'],['Circulation','Hypovolaemia, haemorrhage, hypotension, severe arrhythmia.'],['Metabolic','Electrolyte, glucose, acid-base, temperature abnormalities.'],['Drug-related','Excessive anaesthetic depth, drug effect, anaphylaxis, local anaesthetic toxicity.'],['Mechanical','Tension pneumothorax, cardiac tamponade, severe abdominal/thoracic pressure where relevant.']], [5*cm,12*cm])]
a += [P('8. Reversal agents: overview','H1x'),P('An antagonist reverses the action of a specific drug class. It does <b>not</b> replace oxygenation, ventilation, warming, monitoring, or treatment of shock. Reversal can also remove useful sedation or analgesia and may cause abrupt behavioural or physiological changes.'),tab(['Drug class causing effect','Reversal agent','Core safety point'],[['Alpha-2 agonists such as dexmedetomidine, medetomidine, xylazine','Atipamezole for medetomidine/dexmedetomidine; species-specific alternatives/protocols may be used for other alpha-2 agents.','Use only when clinically indicated. Reversal can remove sedation and some analgesia; ensure recovery environment and pain plan are adequate.'],['Opioids','Naloxone; partial antagonists or other strategies may be selected by veterinarian.','Can reverse respiratory depression but may abruptly reverse analgesia and cause severe pain, dysphoria, or sympathetic stimulation. Titrate when appropriate.'],['Benzodiazepines','Flumazenil.','May reverse sedation but can precipitate seizures in susceptible patients or after chronic benzodiazepine exposure.'],['Neuromuscular blockers','Reversal depends on blocking agent and level of block, for example anticholinesterase approaches in appropriate situations.','Requires specific assessment and monitoring. Do not assume visible movement proves adequate recovery of ventilation.']], [4.5*cm,5.7*cm,6.8*cm])]
a += [P('9. Safe decision flow for reversal','H1x'),flow(['Prolonged or concerning recovery / drug adverse effect','First check ABCDE, temperature, glucose, ventilation, oxygenation, and equipment','Identify drug(s), dose, time, patient disease, and present analgesic plan','Ask: is the drug effect causing harm, or merely expected sedation?','If reversal is justified, choose correct antagonist and use veterinary protocol','Provide analgesic replacement before opioid antagonism if pain remains likely','Observe continuously for resedation, pain, dysphoria, arrhythmia, or recurrent respiratory depression'])]
a += [P('10. Why reversal may not be the best first step','H1x'),tab(['Situation','Reason to pause before reversing'],[['Slow recovery due to hypothermia','Warm and support first. Drug metabolism and elimination may be slow.'],['Opioid-sedated painful patient','Full naloxone reversal may create severe pain. Optimize ventilation and use a titrated strategy only under veterinary guidance.'],['Alpha-2 sedated patient recovering calmly','Routine immediate reversal may not be needed; assess perfusion, comfort, and need for timely recovery.'],['Unclear cause of collapse','Airway, oxygenation, ventilation, perfusion, and equipment checks have priority.']], [6*cm,11*cm])]
a += [PageBreak(),P('11. Recovery-period emergencies','H1x'),tab(['Problem','Prevention and response'],[['Airway obstruction after extubation','Extubate only when appropriate for species and patient; provide oxygen, positioning, monitoring, and rapid re-intubation plan when needed.'],['Excitement/dysphoria','Quiet, dim area; protect from injury; assess pain, hypoxaemia, hypercapnia, and drug effect before giving additional medication.'],['Hypothermia and delayed recovery','Continuous temperature monitoring, active warming, and reassessment of glucose, perfusion, and ventilation.'],['Pain crisis','Use validated pain assessment, multimodal analgesia, and reassessment. Do not label every tachycardia or restlessness as pain without checking other causes.'],['Bleeding','Check surgical site, drains, mucous membranes, blood pressure, and PCV/total protein or other tests as appropriate.']], [5.6*cm,11.4*cm])]
a += [P('12. Emergency cart/checklist content','H1x'),tab(['Area','Examples'],[['Airway and breathing','Oxygen, mask, endotracheal tubes, laryngoscope, suction, breathing bag, circuit connectors, capnography access.'],['Circulation and access','IV/IO supplies, fluids, infusion equipment, ECG, blood-pressure equipment, defibrillator if available.'],['Monitoring','Pulse oximeter, temperature probe, ECG, blood pressure, capnography, emergency record sheet.'],['Drugs','Clearly labelled emergency medications and indicated antagonists, with current expiry check and species-specific protocols.'],['Human factors','Emergency telephone numbers, CPR algorithm, assigned roles, checklists, training and debrief process.']], [4.7*cm,12.3*cm])]
a += [P('Exam-ready summary','H1x'),flow(['Early recognition through vigilant monitoring is the best emergency treatment','Use ABCDE: airway, breathing, circulation, depth/drugs, everything else','Support oxygenation, ventilation and perfusion while identifying the cause','Hypotension, hypoxaemia, hypercapnia, bradycardia, temperature problems and airway events require immediate systematic assessment','Reversal agents are class-specific and should be used thoughtfully, not automatically','After every emergency: continue monitoring, document, communicate, and review the event'])]
a += [Spacer(1,7),P('<b>Safety note:</b> This is an educational study guide, not a dosing or resuscitation protocol. Anaesthetic crises require a trained veterinarian, current species-specific emergency procedures, drug labels, and local institutional CPR guidelines.','N'),P('Reference framework: 2025 ACVAA Small Animal Anaesthesia Monitoring Guidelines; AAHA Anaesthesia and Monitoring Guidelines; standard anaesthesia texts.','S')]
D.build(a,onFirstPage=foot,onLaterPages=foot)
print(out)

from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.enums import TA_CENTER
from reportlab.lib.units import cm
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, PageBreak, KeepTogether
from reportlab.pdfbase.pdfmetrics import stringWidth
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.pdfbase import pdfmetrics
from reportlab.lib.colors import HexColor
from reportlab.pdfbase.pdfmetrics import registerFontFamily
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.lib import utils

OUT='/tmp/workspace/veterinary-anaesthesia-study-guide/output/Veterinary_Anaesthesia_Complete_Study_Guide_Dog_Cat_Horse_Cattle.pdf'
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styles=getSampleStyleSheet()
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styles.add(ParagraphStyle(name='H1x', parent=styles['Heading1'], fontName='Helvetica-Bold', fontSize=16, leading=20, textColor=navy, spaceBefore=8, spaceAfter=8))
styles.add(ParagraphStyle(name='H2x', parent=styles['Heading2'], fontName='Helvetica-Bold', fontSize=12, leading=15, textColor=teal, spaceBefore=7, spaceAfter=5))
styles.add(ParagraphStyle(name='BodyX', parent=styles['BodyText'], fontName='Helvetica', fontSize=8.8, leading=12, spaceAfter=5))
styles.add(ParagraphStyle(name='SmallX', parent=styles['BodyText'], fontName='Helvetica', fontSize=7.2, leading=9))
styles.add(ParagraphStyle(name='Warn', parent=styles['BodyText'], fontName='Helvetica-Bold', fontSize=8.2, leading=11, textColor=red, backColor=HexColor('#FFF0F0'), borderPadding=7, spaceAfter=7))

def P(x, st='BodyX'): return Paragraph(x, styles[st])
def flow(lines):
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def table(headers, rows, widths):
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def section(title, intro=None):
    story.append(PageBreak()); story.append(P(title,'H1x'))
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def footer(canvas,doc):
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doc=SimpleDocTemplate(OUT,pagesize=A4,rightMargin=1.25*cm,leftMargin=1.25*cm,topMargin=1.25*cm,bottomMargin=1.25*cm)
story=[]
story += [Spacer(1,2.4*cm),P('VETERINARY ANAESTHESIA','TitleX'),P('Complete Study Guide: Dogs, Cats, Horses and Cattle','TitleX'),Spacer(1,0.4*cm),P('Five core topics with simple explanations, flow charts, species notes, dose concepts, adverse effects, contraindications, monitoring, emergencies, and antagonists.', 'BodyX'),Spacer(1,0.5*cm),P('<b>Contents</b><br/>1. General considerations and patient evaluation<br/>2. Pain management and local/regional anaesthesia<br/>3. Premedication drugs and dose concepts<br/>4. General, inhalation and dissociative anaesthesia<br/>5. Anaesthetic emergencies and reversal agents<br/>6. Consolidated species dose reference and final revision charts','BodyX'),Spacer(1,0.5*cm),P('IMPORTANT SAFETY NOTICE: This guide is a study aid, not a prescription manual. Dose ranges are commonly taught reference ranges and may differ by product formulation, country, indication, route, age, body condition, disease, food-animal regulations, and local protocols. A veterinarian must verify the current product label, calculate each individual dose, and use species-specific monitoring. In cattle, comply with local food-safety and withdrawal laws.','Warn')]

section('1. General Considerations and Patient Evaluation','Safe anaesthesia is an individual plan, not a fixed recipe. The objective is unconsciousness when needed, analgesia, muscle relaxation, stable oxygen delivery, and a calm recovery.')
story += [flow(['Animal presented for procedure','History + examination + targeted tests','Identify risks and stabilize correctable problems','Choose analgesia, sedation, induction and maintenance plan','Prepare equipment, IV access, emergency drugs and monitoring','Recover, reassess pain and document the event']),Spacer(1,8)]
story.append(table(['Factor','Why it changes the plan'],[
['Species','Cats are sensitive to stress and lidocaine toxicity; horses need a planned, protected recovery; cattle have regurgitation, bloat and aspiration risk.'],['Age','Neonates lose heat/glucose quickly; geriatric animals have lower cardiac, renal and hepatic reserve.'],['Breed/body condition','Brachycephalic dogs need airway planning; obesity impairs ventilation; emaciation increases hypothermia/drug effect.'],['Disease','Cardiac, respiratory, renal, hepatic, endocrine, neurological disease and shock alter drug choice and monitoring.'],['Procedure','Pain, duration, position, anticipated blood loss, emergency status and access to the airway determine technique.']], [3.3*cm,14.2*cm]))
story += [P('Preanaesthetic evaluation','H2x'),flow(['History: previous anaesthesia, adverse reactions, medications, fasting, vomiting/regurgitation, exercise tolerance, cough, urination, bleeding, pregnancy.','Examination: demeanour, accurate weight, hydration, mucous membranes/CRT, temperature, pulse, respiration, airway, heart/lungs, abdomen, pain and IV access.','Tests when indicated: PCV/total protein, CBC, glucose, biochemistry/electrolytes, urinalysis, blood pressure, ECG, imaging, coagulation testing and crossmatch.']),P('ASA physical-status grading','H2x'),table(['Grade','Meaning'],[['I','Normal healthy patient'],['II','Mild systemic disease'],['III','Severe systemic disease'],['IV','Severe systemic disease, constant threat to life'],['V','Moribund patient not expected to survive without surgery'],['E','Suffix for emergency, for example ASA III-E']], [3*cm,14.5*cm]),P('Preparation checklist','H2x'),P('Identity and consent; baseline vital signs; fasting plan individualized to species and patient; IV catheter; oxygen and breathing system check; endotracheal tubes; fluids and warming; calculated emergency and reversal drugs; record sheet; assigned anaesthetist.')]

section('2. Pain Management and Local/Regional Anaesthesia','Pain is a sensory and emotional experience. Treat pain before it becomes severe, reassess regularly, and combine methods that work at different sites in the pain pathway.')
story += [flow(['Tissue injury or surgery','Peripheral nociceptors activated','Signals travel via peripheral nerves and spinal cord','Brain perceives pain','Untreated pain may cause sensitization and chronic maladaptive pain']),P('Multimodal analgesia','H2x'),P('A typical plan combines an opioid, a local/regional block, and an anti-inflammatory drug when safe. Additional options include alpha-2 agonists, ketamine as an analgesic adjunct, cold therapy, positioning, quiet nursing and rehabilitation.'),table(['Pain type','Common signs'],[['Acute','Tachycardia, guarding, reluctance to move, vocalization, aggression, reduced appetite, abnormal posture.'],['Chronic','Reduced activity/jumping, stiffness, altered grooming, sleep change, withdrawal, behaviour changes.'],['Horse/cattle','Subtle signs may include reduced feeding, altered stance, kicking at abdomen, teeth grinding, decreased rumination or response to handling.']], [3.1*cm,14.4*cm]),P('Local and regional anaesthesia','H2x'),P('Local anaesthetics reversibly block voltage-gated sodium channels in nerves. Pain impulses cannot propagate. They reduce inhalant requirement and improve recovery quality.'),flow(['Local anaesthetic near nerve','Sodium-channel blockade','Action potential fails to travel','Loss of sensation in target region','Less systemic anaesthetic required'])]
story.append(table(['Technique','Examples / important point'],[['Topical','Cornea, mucosa, skin surface.'],['Infiltration / line block','Inject around incision or wound. Aspirate first, inject incrementally.'],['Field/ring block','Surround tissue or digit with local anaesthetic.'],['Peripheral nerve block','Dental, limb, paravertebral, cornual block in cattle.'],['Epidural','Useful for caudal abdomen, pelvis, perineum and hindlimbs. Sterile technique and correct volume are essential.']], [4*cm,13.5*cm]))
story += [P('Local anaesthetic precautions','H2x'),P('Avoid intravascular injection: calculate total dose from every injection site, aspirate before injection, use incremental injections, and monitor. Toxicity causes CNS signs such as agitation, tremors or seizures and cardiovascular depression/arrhythmias. Stop injection, support airway/oxygenation/ventilation, treat seizures and follow veterinary local-anaesthetic-toxicity protocols. Cats require extra caution with lidocaine.'),P('Do not inject into infected tissue or where anatomy is uncertain without assessing risks. Avoid or adjust in severe liver disease, severe hypoproteinaemia, shock/poor perfusion, known hypersensitivity, and when the maximum cumulative dose has been approached.')]

section('3. Premedication Drugs and Dosage Concepts','Premedication is given before induction to lower fear, provide analgesia where appropriate, reduce induction dose and make handling safer. The drug choice depends on health status and the procedure.')
story += [flow(['Evaluate patient and pain','Choose goals: anxiolysis, sedation, analgesia, reduced secretions, smoother induction','Select compatible drug classes at lower doses when combined','Allow time for effect and monitor','Titrate induction agent to effect']),table(['Class','Main effects','Main cautions / antagonist'],[['Anticholinergic: atropine, glycopyrrolate','Increase heart rate; reduce salivation.','May cause tachycardia and increase myocardial oxygen demand. Avoid routine use; use if indicated. No routine antagonist.'],['Phenothiazine: acepromazine','Tranquilization, vasodilation; no analgesia.','Hypotension, hypothermia, long duration. Avoid/limit in shock, hypovolaemia and some seizure-prone or breeding animals. No specific antagonist.'],['Benzodiazepine: diazepam, midazolam','Anxiolysis, muscle relaxation; useful with ketamine.','May cause excitement in healthy animals when used alone. Flumazenil reverses effect but can precipitate seizures in susceptible animals.'],['Opioid: morphine, methadone, hydromorphone, butorphanol, buprenorphine','Analgesia, sedation when combined.','Respiratory depression, bradycardia, vomiting, dysphoria/excitement or reduced GI motility. Naloxone reverses but also removes analgesia.'],['Alpha-2 agonist: xylazine, detomidine, medetomidine/dexmedetomidine, romifidine','Sedation, analgesia, muscle relaxation.','Bradycardia, reduced cardiac output, vasoconstriction, arrhythmias, vomiting in cats, respiratory effects. Avoid/limit in shock, serious cardiac disease, severe respiratory disease and compromised ruminants. Atipamezole/yohimbine/tolazoline may reverse depending on drug/species.']], [3.2*cm,6*cm,8.3*cm])]
story += [P('Dose calculation concepts','H2x'),flow(['1. Weigh animal accurately','2. Select dose in mg/kg from current species-specific reference','3. Total mg = body weight (kg) x dose (mg/kg)','4. Volume (mL) = total mg / concentration (mg/mL)','5. Independently recheck concentration, decimal point, route, maximum total dose and every drug already given']),P('Example only: a 20 kg dog prescribed 0.2 mg/kg receives 4 mg. If the product is 2 mg/mL, volume = 4/2 = 2 mL. This is a mathematical example, not a drug recommendation.')]

section('4. General, Inhalation and Dissociative Anaesthesia','General anaesthesia is a controlled, reversible state of unconsciousness with varying degrees of analgesia and muscle relaxation. It is a continuum: preanaesthesia, induction, maintenance, recovery.')
story += [flow(['Preanaesthetic assessment and stabilization','Premedication and pre-emptive analgesia','Induction and airway control','Maintenance with inhalant, TIVA or balanced technique','Continuous monitoring and physiologic support','Recovery, pain reassessment and documentation']),P('Induction and maintenance concepts','H2x'),table(['Method','Strengths','Limitations / key caution'],[['IV induction agents','Rapid, smooth induction when titrated.','Can cause apnoea or hypotension; administer to effect after premedication.'],['Inhalant maintenance','Easy depth adjustment; exhaled through lungs; good for long procedures.','Dose-dependent respiratory and cardiovascular depression; needs machine, oxygen, scavenging and airway control.'],['TIVA','Useful where inhalant machine unavailable or for selected cases.','Accumulation and prolonged recovery possible; pump/accurate delivery and monitoring needed.'],['Dissociative anaesthesia','Ketamine/tiletamine-based protocols can preserve some reflexes and support sympathetic tone.','Not adequate muscle relaxation alone; can cause rigidity, dysphoria and rough recovery. Combine appropriately.']], [3.1*cm,7.2*cm,7.2*cm]),P('Inhalant anaesthetics','H2x'),P('Isoflurane and sevoflurane are common volatile agents. They are usually delivered in oxygen through a correctly placed endotracheal tube. Use vaporizer settings and end-tidal agent concentration to titrate effect, not a fixed setting. Reduce inhalant requirement with analgesia and regional blocks.'),flow(['Oxygen + volatile agent enters lungs','Alveoli -> blood -> brain','Anaesthetic depth changes','Turn vaporizer off','Drug leaves blood through lungs during exhalation','Recovery with monitoring'])]
story += [P('Dissociative anaesthesia','H2x'),P('Ketamine is an NMDA-receptor antagonist. It produces dissociation, analgesia and amnesia but can leave palpebral, swallowing and laryngeal reflexes present. It is commonly combined with a benzodiazepine or alpha-2 agonist. Tiletamine is commonly combined with zolazepam in a fixed product. Maintain airway vigilance despite apparent reflexes.'),P('Monitoring minimums','H2x'),table(['System','Observe / measure'],[['Depth','Jaw tone, eye position, palpebral/withdrawal response, purposeful movement, response to surgery.'],['Circulation','Heart rate/rhythm, pulse quality, blood pressure, ECG as indicated.'],['Oxygenation','Mucous membranes, pulse oximetry, inspired oxygen.'],['Ventilation','Respiratory rate/effort, capnography, blood gases where needed.'],['Temperature','Continuous or frequent temperature checks; active warming when appropriate.'],['Recovery','Airway, oxygenation, temperature, pain, calm protected environment.']], [3.1*cm,14.4*cm])]

section('5. Anaesthetic Emergencies and Reversal Agents','Most emergencies are detected early by vigilant monitoring. When a problem occurs, call for help, stop or reduce contributing drugs, provide oxygen, assess airway and ventilation, and treat the cause.')
story += [flow(['Recognize abnormal trend','Call for help and state problem aloud','Stop/reduce anaesthetic delivery where appropriate','Airway: check tube, obstruction and oxygen supply','Breathing: assess ventilation and capnography; assist ventilation if needed','Circulation: evaluate pulse, ECG, blood pressure, blood loss and depth','Treat likely cause, reassess, document and plan recovery']),table(['Emergency','Immediate priorities'],[['Hypoxaemia','Confirm probe/reading; supply oxygen; check ET tube, breathing circuit, airway obstruction, lung disease and ventilation.'],['Hypoventilation / hypercapnia','Check depth, tube and circuit; reduce anaesthetic if appropriate; provide assisted/controlled ventilation.'],['Hypotension','Confirm measurement; reduce inhalant if possible; assess depth, blood loss, dehydration, vasodilation, bradycardia, cardiac disease; provide veterinary-directed fluids/inotropes/vasopressors.'],['Bradycardia','Assess perfusion and cause: alpha-2 agonist, opioid, deep anaesthesia, hypoxia, hyperkalaemia. Treat only in context of blood pressure/perfusion.'],['Regurgitation/aspiration','Protect airway, suction if appropriate, provide oxygen, evaluate lungs; follow clinician plan.'],['Cardiac arrest','Immediate high-quality CPR using current veterinary RECOVER or institutional protocol; address reversible causes.'],['Local anaesthetic systemic toxicity','Stop injection; call for help; oxygen/ventilation, seizure and cardiovascular support, and current protocol.']], [4.4*cm,13.1*cm]),P('Reversal principles','H2x'),P('Reversal may improve dangerous/prolonged sedation but may also abruptly remove analgesia or cause dysphoria, pain, tachycardia, hypertension or re-sedation. Always have analgesia, monitoring and recovery nursing ready. Reversal is not a substitute for airway/ventilation support.')]
story.append(table(['Drug effect being reversed','Antagonist','Important caution'],[['Alpha-2 agonist','Atipamezole; yohimbine or tolazoline in selected species/protocols','Analgesia and sedation are lost. Reassess pain. Choice and dose depend on agonist, species and timing.'],['Opioid','Naloxone','Reverses analgesia too. Titrate only when needed and ensure another analgesic plan.'],['Benzodiazepine','Flumazenil','May trigger seizures in predisposed or chronically exposed patients; shorter duration than some benzodiazepines.'],['Neuromuscular block','Agent-specific reversal, such as neostigmine or sugammadex where appropriate','Use quantitative neuromuscular monitoring and clinician-specific protocol.'],['Acepromazine','No specific antagonist','Support blood pressure, temperature and recovery; allow metabolism.'],['Ketamine/tiletamine','No direct routine antagonist','Supportive care; reverse any co-administered alpha-2 or benzodiazepine only with a pain/recovery plan.']], [4.1*cm,4.5*cm,8.9*cm]))

section('6. Consolidated Species Dose Reference','These are educational, commonly used reference ranges for selected drugs. They are not complete anaesthetic protocols. Verify current labels and local laws before use. “Not routine” means no general recommendation is made here, not that use is impossible.')
story.append(P('A. Sedatives, opioids and induction-related drugs','H2x'))
story.append(table(['Drug and route','Dog','Cat','Horse','Cattle','Key adverse effects / contraindications / antagonist'],[
['Acepromazine IM/IV','0.01-0.03 mg/kg','0.025-0.1 mg/kg','0.02-0.05 mg/kg','0.02-0.05 mg/kg','Hypotension, hypothermia, prolonged sedation. No analgesia or specific reversal. Avoid/limit in shock, hypovolaemia and severe debility.'],
['Midazolam IV/IM','0.1-0.3 mg/kg','0.1-0.3 mg/kg','0.02-0.06 mg/kg','0.1-0.2 mg/kg','Excitement if used alone in healthy animals. Flumazenil reverses. Use caution in seizure-prone patients before reversal.'],
['Diazepam IV','0.2-0.5 mg/kg','0.2-0.5 mg/kg','0.02-0.1 mg/kg','0.1-0.2 mg/kg','IV preferred. Excitement possible if alone. Flumazenil antagonist.'],
['Butorphanol IV/IM','0.2-0.4 mg/kg','0.2-0.4 mg/kg','0.01-0.05 mg/kg','0.02-0.1 mg/kg','Sedation/short analgesia; respiratory depression, GI effects, dysphoria possible. Naloxone antagonist.'],
['Morphine IV/IM','0.2-0.5 mg/kg','0.1-0.3 mg/kg','0.05-0.1 mg/kg','Use only under food-animal law/protocol','Vomiting, histamine release with rapid IV, respiratory depression, ileus. Naloxone antagonist.'],
['Xylazine IV/IM','0.25-1 mg/kg','0.5-1 mg/kg','0.3-1.1 mg/kg','0.02-0.1 mg/kg','Marked bradycardia/reduced cardiac output; ruminants highly sensitive. Atipamezole/yohimbine/tolazoline per protocol.'],
['Detomidine IV','Not routine','Not routine','0.005-0.02 mg/kg','Not routine','Alpha-2 adverse effects. Atipamezole or other alpha-2 antagonist per species/protocol.'],
['Dexmedetomidine IM/IV','3-10 mcg/kg','5-10 mcg/kg','Not routine','Not routine','Bradycardia, vasoconstriction, vomiting. Atipamezole reverses.'],
['Ketamine IV induction','2-5 mg/kg (with co-drug)','2-5 mg/kg (with co-drug)','2.0-2.5 mg/kg (after sedation)','2-5 mg/kg (with sedation)','Rigidity, increased sympathetic tone, dysphoria; no direct antagonist. Avoid as sole agent in seizure-prone/raised ICP or severe hypertension as clinically relevant.'],
['Tiletamine-zolazepam IV/IM','2-5 mg/kg','2-5 mg/kg','Not routine','Not routine','Prolonged/rough recovery possible. Zolazepam component may be reversed by flumazenil, but tiletamine remains active.'],
['Propofol IV to effect','1-6 mg/kg','2-8 mg/kg','2-4 mg/kg','1-4 mg/kg','Apnoea and hypotension, especially rapid injection. No antagonist. Titrate slowly.'],
['Alfaxalone IV to effect','1-3 mg/kg','1-5 mg/kg','1-3 mg/kg','Not routine','Apnoea/excitement if rapid or high dose. No antagonist.']], [3.05*cm,2.1*cm,2.1*cm,2.1*cm,2.1*cm,6.05*cm]))
story.append(PageBreak());story.append(P('6. Consolidated Species Dose Reference - continued','H1x'));story.append(P('B. Local anaesthetics, inhalants and reversal references','H2x'))
story.append(table(['Drug / technique','Dog','Cat','Horse','Cattle','Key safety points'],[
['Lidocaine, total local infiltration','Up to 6 mg/kg','Up to 4 mg/kg','Commonly 2-4 mg/kg, site dependent','Commonly 2-4 mg/kg, site dependent','Calculate all injected volumes. Cats are more sensitive. No direct antagonist; treat toxicity supportively.'],
['Bupivacaine / ropivacaine, total local dose','About 2 mg/kg','About 1 mg/kg','Use conservative site-specific total dose','Use conservative site-specific total dose','Longer duration; more cardiotoxic potential with bupivacaine. Aspirate/incremental injection.'],
['Mepivacaine local block','Use species-specific site dose','Use species-specific site dose','Commonly used for equine nerve/joint blocks','Use species-specific site dose','Do not exceed cumulative dose; toxicity is CNS/cardiovascular.'],
['Lidocaine IV infusion','1-2 mg/kg bolus then 20-50 mcg/kg/min CRI','Generally avoid routine IV CRI','1-2 mg/kg bolus then 20-50 mcg/kg/min CRI','Not routine','Use only with ECG/BP monitoring and trained staff; CNS/cardiac toxicity possible.'],
['Isoflurane maintenance','Titrate to effect','Titrate to effect','Titrate to effect','Titrate to effect','Dose-dependent hypotension and respiratory depression. No antagonist; turn vaporizer off and support.'],
['Sevoflurane maintenance','Titrate to effect','Titrate to effect','Titrate to effect','Titrate to effect','Rapid adjustment/recovery; same cardiorespiratory monitoring required.'],
['Atipamezole','5x dexmedetomidine dose in mcg/kg, IM commonly used','5x dexmedetomidine dose in mcg/kg, IM commonly used','Protocol-specific','Protocol-specific','Alpha-2 antagonist. Give only with pain/recovery plan. May cause abrupt arousal.'],
['Naloxone','0.01-0.04 mg/kg IV/IM titrated','0.01-0.04 mg/kg IV/IM titrated','0.01-0.04 mg/kg IV/IM titrated','0.01-0.04 mg/kg IV/IM titrated','Opioid antagonist. May remove analgesia and trigger pain/dysphoria.'],
['Flumazenil','0.01 mg/kg IV, titrate','0.01 mg/kg IV, titrate','0.01 mg/kg IV, titrate','0.01 mg/kg IV, titrate','Benzodiazepine antagonist. Monitor for re-sedation or seizures.']], [3.2*cm,2.1*cm,2.1*cm,2.1*cm,2.1*cm,5.8*cm]))
story += [P('Interpret dose tables safely','H2x'),P('Ranges vary because purpose matters: a light-sedation dose differs from an induction dose, an analgesic infusion, or a standing-procedure dose. Route also changes effect. Use the lower end when drugs are combined, in frail/geriatric animals, or where cardiovascular reserve is limited. Titrate IV induction drugs to clinical effect. Never add dose ranges from different sources without checking the exact formulation and protocol.'),P('Species-specific high-yield cautions','H2x'),table(['Species','High-yield safety points'],[['Dog','Brachycephalic airway disease, MDR1/ABCB1 mutation concerns with some drugs, obesity and geriatric disease require modification.'],['Cat','Stress-sensitive; alpha-2 agonists and opioids can cause vomiting; lidocaine has a lower safety margin; warm and monitor closely.'],['Horse','Plan induction and recovery environment. Recumbency risks hypoxaemia, neuropathy/myopathy and injury. Secure the airway and protect recovery.'],['Cattle','Highly sensitive to alpha-2 agonists; regurgitation, salivation, bloat and aspiration are key risks. Use low doses, correct positioning, airway precautions and food-animal legal controls.']], [3*cm,14.5*cm]),P('Final rapid-revision flow chart','H2x'),flow(['Assess patient -> ASA grade -> stabilize','Plan pre-emptive multimodal analgesia and local block','Choose species-appropriate premedication','Induce to effect and secure airway','Maintain with lowest effective balanced technique','Monitor depth + circulation + oxygenation + ventilation + temperature','Treat abnormal trends early','Recover calmly, reassess pain, document, discharge with instructions'])]
story.append(P('Evidence framework: AAHA Anesthesia and Monitoring Guidelines for Dogs and Cats (2020); ACVAA Small Animal Anesthesia and Sedation Monitoring Guidelines (2025); Merck Veterinary Manual, Analgesics Used in Animals; standard veterinary anaesthesia references. The recent ACVAA monitoring guideline is indexed in PubMed as PMID 40447502.','SmallX'))
doc.build(story,onFirstPage=footer,onLaterPages=footer)
print(OUT)

from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.lib.colors import HexColor
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.enums import TA_CENTER
from reportlab.lib.units import cm
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, PageBreak
from pypdf import PdfReader, PdfWriter

BASE='/tmp/workspace/veterinary-anaesthesia-study-guide/output/Veterinary_Anaesthesia_Complete_Study_Guide_Dog_Cat_Horse_Cattle.pdf'
APP='/tmp/workspace/veterinary-anaesthesia-study-guide/output/_emergency_algorithm_appendix.pdf'
OUT='/tmp/workspace/veterinary-anaesthesia-study-guide/output/Veterinary_Anaesthesia_Complete_Study_Guide_Dog_Cat_Horse_Cattle_with_Emergency_Algorithms.pdf'
navy=HexColor('#13315C'); teal=HexColor('#087E8B'); pale=HexColor('#EAF4F4'); red=HexColor('#9B1C1C'); grey=HexColor('#F2F4F7')
s=getSampleStyleSheet()
s.add(ParagraphStyle(name='T',parent=s['Title'],fontName='Helvetica-Bold',fontSize=20,leading=24,alignment=TA_CENTER,textColor=navy,spaceAfter=10))
s.add(ParagraphStyle(name='H',parent=s['Heading1'],fontName='Helvetica-Bold',fontSize=14,leading=17,textColor=navy,spaceBefore=8,spaceAfter=6))
s.add(ParagraphStyle(name='B',parent=s['BodyText'],fontName='Helvetica',fontSize=8.7,leading=11.5,spaceAfter=5))
s.add(ParagraphStyle(name='S',parent=s['BodyText'],fontName='Helvetica',fontSize=7.4,leading=9.3))
s.add(ParagraphStyle(name='W',parent=s['BodyText'],fontName='Helvetica-Bold',fontSize=8,leading=10.5,textColor=red,backColor=HexColor('#FFF1F1'),borderPadding=7,spaceAfter=7))
def p(x,style='B'): return Paragraph(x,s[style])
def algorithm(title, steps, alert=''):
    a=[p(f'<b>{title}</b>','B')]
    if alert: a.append(p(alert,'W'))
    rows=[]
    for i,x in enumerate(steps,1): rows.append([p(str(i),'S'),p(x,'S')])
    t=Table(rows,colWidths=[0.65*cm,16.85*cm],hAlign='LEFT')
    t.setStyle(TableStyle([('BACKGROUND',(0,0),(-1,-1),pale),('BOX',(0,0),(-1,-1),0.6,teal),('LINEBELOW',(0,0),(-1,-2),0.25,colors.white),('VALIGN',(0,0),(-1,-1),'TOP'),('ALIGN',(0,0),(0,-1),'CENTER'),('LEFTPADDING',(0,0),(-1,-1),6),('RIGHTPADDING',(0,0),(-1,-1),6),('TOPPADDING',(0,0),(-1,-1),4),('BOTTOMPADDING',(0,0),(-1,-1),4)]))
    a.extend([t,Spacer(1,7)])
    return a
def foot(c,d):
    c.saveState(); c.setFont('Helvetica',7); c.setFillColor(navy)
    c.drawString(1.25*cm,0.7*cm,'Veterinary Anaesthesia Study Guide | Quick-reference emergency algorithms')
    c.drawRightString(19.7*cm,0.7*cm,f'Appendix page {d.page}')
    c.restoreState()

doc=SimpleDocTemplate(APP,pagesize=A4,leftMargin=1.25*cm,rightMargin=1.25*cm,topMargin=1.15*cm,bottomMargin=1.2*cm)
st=[]
st += [p('QUICK-REFERENCE ANAESTHETIC EMERGENCY ALGORITHMS','T'),p('Dogs, cats, horses and cattle: immediate actions to organize clinical response. Use alongside current species-specific hospital protocols, product labels and RECOVER CPR guidelines.','B'),p('SAFETY: These algorithms do not replace a veterinarian or critical-care protocol. Call for help early. A dedicated person should monitor the patient, record time and values, and state the problem aloud. Do not give drugs from memory: use the pre-calculated emergency sheet and current institutional protocol.','W')]
st += algorithm('Universal first response: any deterioration',['Recognize the abnormal trend and confirm the reading. Check probe placement, monitor function and patient manually.','Call for help. Assign roles: airway/ventilation, circulation/IV access, drug preparation, record keeping.','Reduce or stop contributing anaesthetic delivery if clinically appropriate, while maintaining analgesia and a safe airway.','Give oxygen, check oxygen source and breathing circuit, and reassess airway patency.','Assess ABC: airway, breathing, circulation. Obtain or repeat heart rate/rhythm, pulse quality, blood pressure, SpO2, ETCO2, temperature and anaesthetic depth.','Identify likely cause: excessive depth, drug effect, blood loss, hypovolaemia, obstruction, equipment fault, arrhythmia, hypothermia, metabolic problem or surgical stimulus.','Treat cause, reassess frequently and document response.'])
st += algorithm('Hypoxaemia or low SpO2',['Confirm reading: inspect pulse-oximeter site and waveform; assess mucous membranes and pulse quality.','Immediately increase oxygen availability. Check cylinder/pipeline, flowmeter, circuit connections, reservoir bag and leak.','Check airway: endotracheal tube position/patency, kinks, secretions, obstruction, cuff and accidental extubation. Suction or re-intubate if indicated.','Assess ventilation with ETCO2, chest movement and bag compliance. Assist or control ventilation if hypoventilation/apnoea is present.','Consider lung/position causes: atelectasis, aspiration, pulmonary disease, recumbency, abdominal pressure or thoracic problem. Seek senior support and diagnostics.','Continue close monitoring through recovery because hypoxaemia may recur.'],'Cyanosis, severe respiratory distress, absent ETCO2 with an intubated patient, or rapidly falling SpO2 requires immediate airway and ventilation intervention.')
st += algorithm('Hypoventilation, hypercapnia or apnoea',['Check if the animal is breathing and whether ETCO2 is rising, absent or abnormal. Verify capnograph connection.','Ensure airway/circuit patency and adequate oxygen. Check tube obstruction, kinks, exhausted soda lime or circuit malfunction.','Assess depth and recent drugs. Reduce inhalant or injectable anaesthetic burden if possible while preserving analgesia.','Provide assisted or controlled ventilation using species-appropriate settings and reassess ETCO2, chest excursion and blood pressure.','Look for contributing factors: opioid/sedative effect, excessive depth, fatigue, obesity, restrictive positioning, thoracic/abdominal disease or hypothermia.','Do not rely on a normal SpO2 alone: supplemental oxygen can mask inadequate ventilation.'])
st += algorithm('Hypotension or poor perfusion',['Confirm blood pressure with an appropriate cuff/device and assess pulse quality, mucous membranes, heart rate/rhythm, ETCO2 trend and surgical blood loss.','Reduce inhalant concentration or other vasodilating/depressant drugs if depth permits. Add/optimize analgesia or local block rather than simply deepening anaesthesia.','Check IV catheter and evaluate volume status, haemorrhage, dehydration, sepsis, cardiac disease and venous obstruction from position.','Use veterinarian-directed fluid therapy only after considering heart disease, lung disease, renal disease and ongoing blood loss.','If persistent or severe, use clinician-selected inotrope/vasopressor therapy and investigate arrhythmia, myocardial dysfunction, electrolyte/acid-base abnormality and occult haemorrhage.','Maintain warming and reassess pressure and perfusion response frequently.'],'Treat the patient, not one number: trends, pulse quality, ETCO2, urine output and perfusion matter with blood pressure.')
st.append(PageBreak())
st += [p('Quick-reference emergency algorithms - continued','T')]
st += algorithm('Bradycardia or arrhythmia',['Confirm ECG interpretation and correlate with pulse, arterial pressure, ETCO2 and perfusion. A low heart rate alone does not always require drug treatment.','Check oxygenation and ventilation first. Correct hypoxaemia, hypercapnia, deep anaesthesia, hypothermia and severe hypotension.','Review recent alpha-2 agonist, opioid, anticholinergic and anaesthetic administration, surgical traction and possible electrolyte disturbance.','If perfusion is poor, follow the veterinarian-approved species-specific bradycardia/arrhythmia plan. Anticholinergic or alpha-2 reversal decisions must be individualized.','Continue ECG and blood-pressure monitoring. Investigate recurrence and reassess analgesia after reversal.'])
st += algorithm('Regurgitation, reflux or suspected aspiration',['Protect the airway immediately. If intubated, keep cuff inflated while stabilizing and suction the oropharynx/tube as clinically appropriate.','Position the head to reduce aspiration risk if this is compatible with surgery and patient stability.','Provide oxygen and assess ventilation, SpO2, ETCO2 and lung sounds. Do not extubate until airway reflexes and clinical status are suitable.','Document event and monitor during recovery for cough, tachypnoea, fever, increased effort, hypoxaemia or abnormal lung sounds.','Escalate to clinician-directed imaging, blood gas assessment and respiratory treatment if aspiration disease is suspected.'])
st += algorithm('Hypothermia',['Confirm temperature with a reliable probe and evaluate severity and trend.','Minimize heat loss: dry patient, insulate, reduce exposed surface, warm fluids when appropriate and use forced-air/active warming safely.','Avoid thermal burns: do not place unprotected heat sources directly on the patient; monitor skin and temperature.','Anticipate slower drug metabolism and delayed recovery. Reassess anaesthetic depth, cardiovascular function and ventilation.','Continue warming into recovery until temperature is stable and the animal is monitored.'])
st += algorithm('Delayed, dysphoric or unsafe recovery',['Ensure a quiet, padded, species-appropriate recovery area. Horses require a dedicated protected recovery plan.','Check airway, oxygenation, ventilation, temperature, blood pressure, glucose and pain before assuming “just slow recovery.”','Identify residual drug effect, hypothermia, hypotension, hypoxaemia/hypercapnia, pain, delirium, metabolic disease or neurologic complication.','Use reversal only with a veterinarian-approved plan. Reversing opioid or alpha-2 effects can abruptly remove analgesia and cause pain or agitation.','Continue observation until the animal can maintain airway, ventilation, body temperature and safe posture/ambulation.'])
st += algorithm('Cardiopulmonary arrest',['Recognize unresponsiveness, absent effective breathing and absent pulse. Call for help and announce “CPR.”','Start high-quality chest compressions immediately while another team member secures airway, provides oxygen/ventilation and attaches ECG/capnography if available.','Follow current RECOVER or local veterinary CPR algorithm for compression technique, ventilation, rhythm assessment, defibrillation and emergency medications.','Search for reversible causes during CPR: hypoxia, hypovolaemia/haemorrhage, severe anaesthetic depression, hypothermia, electrolyte/metabolic disorders, tension pneumothorax, tamponade or toxin/drug effect.','Record timing, rhythm checks, drugs and response. After return of spontaneous circulation, provide intensive monitoring and treat cause.'],'Do not delay compressions to obtain equipment or calculate drugs. Use current RECOVER guidance and a trained team.')
st += [p('Emergency cart and pre-anaesthetic checklist','H'),p('Before sedation or induction, prepare calculated emergency and reversal drugs, oxygen source, correctly sized endotracheal tubes, laryngoscope, suction, IV equipment, fluids, warming tools, defibrillator when available, monitoring devices, and a written CPR plan. The 2025 ACVAA guidance emphasizes a standardized equipment checklist and pre-calculated emergency and reversal agents.','B'),p('Reference framework: ACVAA Small Animal Anaesthesia and Sedation Monitoring Guidelines (2025); AAHA Anaesthesia and Monitoring Guidelines for Dogs and Cats (2020); current RECOVER CPR resources. Apply local, species-specific and food-animal protocols.','S')]
doc.build(st,onFirstPage=foot,onLaterPages=foot)
writer=PdfWriter()
for path in [BASE,APP]:
    r=PdfReader(path)
    for page in r.pages: writer.add_page(page)
writer.add_metadata({'/Title':'Veterinary Anaesthesia Complete Study Guide with Emergency Algorithms','/Subject':'Dogs, cats, horses and cattle'})
with open(OUT,'wb') as f: writer.write(f)
print(OUT)