Gastroenterology pediatrics important questions from ghai textbook

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Ghai Essential Pediatrics chapter 12 gastrointestinal system liver topics list diarrhea jaundice hepatitis

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Pediatric Gastroenterology - Important Questions from Ghai Essential Pediatrics

Based on Chapter 11/12: "Diseases of Gastrointestinal System and Liver" - Ghai Essential Pediatrics (8th/9th/10th editions)

CHAPTER STRUCTURE (Ghai GI Chapter)

Ghai Chapter 12 (10th ed) covers:

Vomiting, Dysphagia, Constipation, Abdominal pain
Acute diarrhea, Persistent diarrhea, Chronic diarrhea
GI bleeding
Hepatobiliary disorders: Jaundice, Liver failure, Chronic liver disease, Ascites, Portal hypertension
Autoimmune liver disease, Hepatitis B & C, Metabolic liver disease
Neonatal cholestasis, Liver transplantation

TOPIC 1: ACUTE DIARRHEA & DEHYDRATION ⭐⭐⭐ (Most High-Yield)

Important Questions:

Q1. Discuss the physiological basis of ORT and composition of ORS.

WHO-ORS (reduced osmolarity): Na 75 mEq/L, K 20 mEq/L, Cl 65 mEq/L, citrate 10 mEq/L, glucose 75 mmol/L, osmolarity 245 mOsm/L
Based on sodium-glucose co-transport in enterocytes - glucose drives Na absorption even during active secretory diarrhea
Reduced osmolarity ORS preferred over standard ORS - less stool output, less vomiting

Q2. Classify dehydration. How do you assess and manage?

Degree	% Weight Loss	Signs
No dehydration	<5%	Normal
Some dehydration	5-10%	Restlessness, sunken eyes, reduced skin turgor, thirsty
Severe dehydration	>10%	Lethargy/unconscious, very sunken eyes, skin goes back very slowly, unable to drink

Plan A (no dehydration): ORS at home, zinc, continue feeding
Plan B (some dehydration): ORS 75 mL/kg over 4 hours in health facility
Plan C (severe dehydration): IV Ringer's lactate 100 mL/kg (Hartmann's); infants: 30 mL/kg in 1 hr then 70 mL/kg in 5 hrs

Q3. Role of zinc in acute diarrhea.

20 mg elemental zinc/day for 14 days (10 mg/day for infants <6 months)
Reduces severity, duration of diarrhea, and risk of persistent diarrhea
Reduces subsequent incidence of diarrhea for 2-3 months

Q4. When to use antibiotics in acute diarrhea?

Cholera (tetracycline/azithromycin), dysentery (ciprofloxacin/azithromycin), Giardia (metronidazole)
NOT routinely for watery diarrhea
Antiemetic: single dose ondansetron 0.15 mg/kg if vomiting interferes with ORT

TOPIC 2: PERSISTENT & CHRONIC DIARRHEA ⭐⭐

Q5. Define and differentiate acute, persistent, and chronic diarrhea.

Acute: <14 days
Persistent: 14-30 days (WHO definition)
Chronic: >4 weeks (most common use in clinical practice)

Q6. Causes of chronic diarrhea by age (Ghai Table):

Age <6 months	Age 6 months - 5 years	Age >5 years
Cow milk protein allergy	Celiac disease	Celiac disease
Short bowel syndrome	Giardiasis	IBD
Immunodeficiency	Toddler's diarrhea	GI tuberculosis
Anatomical defects	Cow milk protein allergy	Lymphangiectasia
Intractable diarrheas of infancy	Immunodeficiency	Chronic pancreatitis

TOPIC 3: CELIAC DISEASE ⭐⭐⭐

Q7. Discuss etiopathogenesis, clinical features, diagnosis and management of celiac disease.

Permanent sensitivity to gluten (wheat, rye, barley) in genetically susceptible individuals (HLA DQ2/DQ8)
Most common cause of chronic diarrhea in children >2 years in North India
Classical: small bowel diarrhea, growth failure, abdominal distension, anemia, irritability

High-risk groups to screen:

Type 1 diabetes mellitus
Down syndrome
Selective IgA deficiency
Autoimmune thyroid disease
Turner syndrome, Williams syndrome
First-degree relatives of celiac patients

Diagnosis:

Anti-tissue transglutaminase (anti-tTG) IgA antibody - screening test of choice
Check total serum IgA (false negative if IgA deficient)
Duodenal biopsy: villous atrophy, crypt hyperplasia, increased intraepithelial lymphocytes (gold standard)
Endoscopy: scalloping of duodenal folds

Treatment: Strict lifelong gluten-free diet

TOPIC 4: GASTROINTESTINAL BLEEDING ⭐⭐

Q8. Causes of GI bleeding by age (Upper vs Lower):

Age	Upper GI	Lower GI
Newborn	Swallowed maternal blood, gastritis	NEC, malrotation with volvulus, anal fissure, Hirschsprung
Infants	Esophagitis, peptic ulcer	Intussusception, Meckel's diverticulum, anal fissure
Children	Varices, peptic ulcer, Mallory-Weiss	Polyps, IBD, Meckel's, intussusception
Adolescents	Peptic ulcer, varices	IBD, hemorrhoids, polyps

Q9. Red currant jelly stools - classic feature of intussusception (blood + mucoid exudate + stool)

Q10. Approach to GI bleeding:

Apt test - differentiates fetal from maternal hemoglobin (in newborn hematemesis)
Meckel scan (Tc-99m pertechnetate) - for Meckel's diverticulum

TOPIC 5: VOMITING & CONSTIPATION ⭐

Q11. Red flag features indicating serious illness in a child with abdominal pain (Ghai Table):

Pain localized away from umbilicus (RUQ/RLQ)
Nocturnal pain
Failure to thrive / weight loss
Bilious vomiting
GI blood loss
Chronic diarrhea
Persistent fever, jaundice
Arthritis / rash
Family history of IBD
Localized tenderness or abdominal mass
Perianal fistulae

TOPIC 6: JAUNDICE IN CHILDREN ⭐⭐⭐

Q12. Classify jaundice with causes:

Unconjugated hyperbilirubinemia:

Hemolysis (G6PD, hereditary spherocytosis, ABO/Rh incompatibility)
Gilbert syndrome, Crigler-Najjar syndrome
Physiological jaundice of newborn

Conjugated hyperbilirubinemia:

Neonatal cholestasis, biliary atresia, choledochal cyst
Infections: sepsis, viral hepatitis, enteric fever, malaria, leptospirosis
Chronic liver disease
Liver tumors (hepatoblastoma)
Metabolic: Wilson disease, galactosemia, tyrosinemia
Enzyme defects: Dubin-Johnson, Rotor syndrome
Drug toxicity

TOPIC 7: NEONATAL CHOLESTASIS ⭐⭐⭐

Q13. Differentiate biliary atresia from neonatal hepatitis:

Feature	Biliary Atresia	Neonatal Hepatitis
Onset	2-6 weeks	First 2 weeks
Stool color	Persistently acholic	May be pigmented
Liver biopsy	Portal tract expansion, ductular proliferation, fibrosis	Giant cell formation, lobular necrosis
HIDA scan	No excretion into bowel	May show excretion
Treatment	Kasai portoenterostomy	Medical (UDCA)

Q14. HIDA scan:

Negative predictive value 100% - if excretion present, biliary atresia ruled out
Prime with UDCA or phenobarbitone for 3 days before scan to improve diagnostic efficacy

Q15. Kasai portoenterostomy:

Procedure of choice for biliary atresia
Must be done before 8 weeks of age for best outcomes
Bile flow established in ~80% if done early; 30-40% if after 90 days

TOPIC 8: ACUTE VIRAL HEPATITIS ⭐⭐⭐

Q16. Compare Hepatitis A, B, C, D, E:

Feature	Hep A	Hep B	Hep C	Hep E
Virus	RNA	DNA	RNA	RNA
Transmission	Feco-oral	Parenteral/vertical	Parenteral	Feco-oral
Chronic	No	Yes (5-10%)	Yes (70-80%)	No (except pregnancy)
Vaccine	Yes	Yes	No	Yes (in some countries)
Fulminant failure	Rare	More common	Rare	Common in pregnancy

Q17. Diagnosis of hepatitis B:

HBsAg - surface antigen (marker of infection)
Anti-HBs - protective antibody (post-vaccination/recovery)
HBeAg - active viral replication
HBV DNA - viral load
Window period: HBsAg negative, anti-HBs negative, anti-HBc IgM positive

TOPIC 9: LIVER FAILURE ⭐⭐⭐

Q18. Define and discuss acute liver failure (fulminant hepatic failure):

Severe acute liver injury with coagulopathy (INR >1.5 with encephalopathy, or INR >2 without encephalopathy) in absence of known chronic liver disease
Features: jaundice, coagulopathy, encephalopathy, hypoglycemia, ascites

Management (4 H's approach):

Hypoglycemia: 10% dextrose infusion
Hemorrhage: FFP, vitamin K
Hepatic encephalopathy: lactulose, rifaximin, restrict protein
Hyperammonemia: sodium benzoate, zinc supplementation

Criteria for liver transplantation (King's College Criteria):

TOPIC 10: CHRONIC LIVER DISEASE & PORTAL HYPERTENSION ⭐⭐

Q19. Clinical features of chronic liver disease in children: External markers: jaundice, palmar erythema, spider nevi, gynecomastia, caput medusae, clubbing, leuconychia, parotid enlargement, Dupuytren's contracture, failure to thrive, vitamin A/D deficiency signs

Q20. Portal hypertension - causes and complications:

Pre-hepatic: portal vein thrombosis (most common in India)
Hepatic: cirrhosis, schistosomiasis
Post-hepatic: Budd-Chiari syndrome

Complications: esophageal varices, hypersplenism, ascites, hepatorenal syndrome, hepatopulmonary syndrome

Management of variceal bleed: IV octreotide/terlipressin, endoscopic band ligation/sclerotherapy, balloon tamponade (Sengstaken-Blakemore tube), TIPS, surgical shunts

TOPIC 11: INFLAMMATORY BOWEL DISEASE ⭐⭐

Q21. Differentiate Crohn's disease from Ulcerative Colitis:

Feature	Crohn's Disease	Ulcerative Colitis
Location	Any part of GI tract	Colon only (rectum always)
Distribution	Skip lesions	Continuous
Depth	Transmural	Mucosal/submucosal
Histology	Granulomas	Crypt abscesses, goblet cell depletion
Bleeding	Less common	Prominent
Fistulae	Common	Rare
Perianal disease	Common	Rare
Smoking	Worsens	Protective

Extraintestinal manifestations: Aphthous ulcers, uveitis/iritis, arthritis, erythema nodosum, pyoderma gangrenosum, primary sclerosing cholangitis (UC > CD), growth failure

TOPIC 12: METABOLIC LIVER DISEASES ⭐⭐

Q22. Wilson disease:

Autosomal recessive - ATP7B gene on chromosome 13
Copper accumulation in liver, brain, cornea
Age: usually >3 years (rare <5 years)
Features: chronic hepatitis/cirrhosis, neuropsychiatric symptoms, Kayser-Fleischer rings (greenish-brown ring at corneal periphery)
Diagnosis: low serum ceruloplasmin (<20 mg/dL), high 24-hr urinary copper (>100 mcg/day), liver copper >250 mcg/g dry weight
Treatment: D-penicillamine (first line), trientine (second line), zinc (maintenance)

TOPIC 13: INTUSSUSCEPTION ⭐⭐

Q23. Discuss intussusception in children:

Most common in 3 months to 2 years
Ileocolic most common type
Classical triad: colicky abdominal pain + vomiting + red currant jelly stools
Examination: sausage-shaped mass in right hypochondrium, Dance sign (emptiness in RIF)
Diagnosis: USG - target/doughnut sign; X-ray - crescent sign
Treatment: Air/hydrostatic reduction (non-surgical, 1st line) if no peritonitis; surgical reduction if failed or peritonitis

EXAM-FOCUSED MNEMONICS FROM GHAI

Chronic Diarrhea RED FLAGS (GHAI):

Nocturnal pain, Bloody stools, Organomegaly, Weight loss/FTT, Family history IBD, Perianal disease

Causes of Hepatosplenomegaly in children: Infections, hemolytic anemias, portal hypertension, storage disorders (Gaucher, Niemann-Pick), malignancies

HIDA scan preparation: "Pheno/UDCA for 3 days = better HIDA"

FREQUENTLY ASKED LONG QUESTIONS (Ghai)

Discuss acute diarrhea - etiology, assessment, management (ORS, zinc, antibiotics)
Classify dehydration and management - Plan A, B, C
Celiac disease - pathogenesis, clinical features, diagnosis, treatment
Neonatal cholestasis - causes, approach to diagnosis, biliary atresia vs neonatal hepatitis
Acute liver failure in children - definition, causes, management
Portal hypertension - causes, clinical features, management of variceal bleed
Viral hepatitis - comparison, chronic hepatitis B management
Wilson disease - clinical features, diagnosis, treatment
Intussusception - clinical features, diagnosis, management
IBD in children - Crohn's vs UC, extraintestinal manifestations

Short Questions

ORS composition and reduced osmolarity ORS
Apt test (distinguishes fetal/maternal Hb)
Meckel's diverticulum features
HIDA scan in neonatal cholestasis
Kasai operation
Rotavirus - features and vaccine
Toddler's diarrhea
Lactose intolerance
Hirschsprung disease
Pseudomembranous colitis (C. difficile)

Sources: Ghai Essential Pediatrics 8th, 9th & 10th editions, Chapter 11/12 (Diseases of Gastrointestinal System and Liver); supplemented by Harriet Lane Handbook 23rd ed for GI bleeding tables

Generate a quick reference PDF comparing celiac disease, IBD, and toddler's diarrhea

Reading File

Running Command

ls /home/daytona/workspace/ 2>/dev/null || echo "workspace empty or missing"

Running Command

mkdir -p /home/daytona/workspace/gi-quickref && python3 -c "import reportlab; pr…

Writing File

~/gi-quickref/generate_pdf.py

from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.lib.units import cm, mm
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.platypus import (
    SimpleDocTemplate, Table, TableStyle, Paragraph,
    Spacer, HRFlowable, KeepTogether
)
from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_JUSTIFY

OUTPUT = "/home/daytona/workspace/gi-quickref/Pediatric_GI_QuickRef.pdf"

# ── Colour palette ───────────────────────────────────────────────
DARK_BLUE   = colors.HexColor("#1A3A5C")
MID_BLUE    = colors.HexColor("#2E6DA4")
LIGHT_BLUE  = colors.HexColor("#D6E8F7")
GREEN       = colors.HexColor("#1D6A3A")
LIGHT_GREEN = colors.HexColor("#D4EDDA")
ORANGE      = colors.HexColor("#B85C00")
LIGHT_ORANGE= colors.HexColor("#FDE8CC")
PURPLE      = colors.HexColor("#5B2D8E")
LIGHT_PURPLE= colors.HexColor("#EAD9F7")
RED         = colors.HexColor("#A02020")
LIGHT_RED   = colors.HexColor("#FAD7D7")
YELLOW_BG   = colors.HexColor("#FFFBE6")
GREY_BG     = colors.HexColor("#F4F6F9")
GREY_BORDER = colors.HexColor("#CCCCCC")
WHITE       = colors.white
BLACK       = colors.HexColor("#1A1A1A")

doc = SimpleDocTemplate(
    OUTPUT, pagesize=A4,
    topMargin=1.5*cm, bottomMargin=1.5*cm,
    leftMargin=1.5*cm, rightMargin=1.5*cm,
    title="Pediatric GI Quick Reference",
    author="Ghai Essential Pediatrics"
)

styles = getSampleStyleSheet()

def style(name, **kw):
    return ParagraphStyle(name, **kw)

S_TITLE = style("Title2", fontName="Helvetica-Bold", fontSize=20, textColor=WHITE,
                alignment=TA_CENTER, leading=26)
S_SUBTITLE = style("Sub2", fontName="Helvetica", fontSize=11, textColor=LIGHT_BLUE,
                   alignment=TA_CENTER, leading=16)
S_SECTION = style("Sec", fontName="Helvetica-Bold", fontSize=13, textColor=WHITE,
                  alignment=TA_CENTER, leading=18)
S_HEAD   = style("Head", fontName="Helvetica-Bold", fontSize=10, textColor=WHITE,
                 alignment=TA_CENTER, leading=14, wordWrap='CJK')
S_BODY   = style("Body", fontName="Helvetica", fontSize=8.5, textColor=BLACK,
                 leading=13, alignment=TA_LEFT)
S_BODY_C = style("BodyC", fontName="Helvetica", fontSize=8.5, textColor=BLACK,
                 leading=13, alignment=TA_CENTER)
S_BOLD   = style("Bold", fontName="Helvetica-Bold", fontSize=8.5, textColor=BLACK,
                 leading=13, alignment=TA_LEFT)
S_BOLD_C = style("BoldC", fontName="Helvetica-Bold", fontSize=8.5, textColor=BLACK,
                 leading=13, alignment=TA_CENTER)
S_SMALL  = style("Small", fontName="Helvetica", fontSize=7.5, textColor=BLACK,
                 leading=11, alignment=TA_LEFT)
S_SMALL_C= style("SmallC", fontName="Helvetica", fontSize=7.5, textColor=BLACK,
                 leading=11, alignment=TA_CENTER)
S_NOTE   = style("Note", fontName="Helvetica-Oblique", fontSize=7.5,
                 textColor=colors.HexColor("#555555"), leading=11, alignment=TA_CENTER)
S_LABEL  = style("Label", fontName="Helvetica-Bold", fontSize=9, textColor=WHITE,
                 alignment=TA_CENTER, leading=13)
S_TAG    = style("Tag", fontName="Helvetica-Bold", fontSize=7.5, textColor=WHITE,
                 alignment=TA_CENTER, leading=11)

def P(text, s=None):
    return Paragraph(text, s or S_BODY)

def PC(text, s=None):
    return Paragraph(text, s or S_BODY_C)

def bold(text):
    return P(text, S_BOLD)

def boldC(text):
    return PC(text, S_BOLD_C)

# ── Helper: section banner ───────────────────────────────────────
def section_banner(title, color=DARK_BLUE):
    tbl = Table([[Paragraph(title, S_SECTION)]], colWidths=[17.7*cm])
    tbl.setStyle(TableStyle([
        ("BACKGROUND", (0,0), (-1,-1), color),
        ("ROUNDEDCORNERS", [6]),
        ("TOPPADDING",  (0,0), (-1,-1), 6),
        ("BOTTOMPADDING",(0,0),(-1,-1), 6),
    ]))
    return tbl

# ── TITLE BLOCK ──────────────────────────────────────────────────
def title_block():
    tbl = Table([
        [Paragraph("Pediatric Gastroenterology", S_TITLE)],
        [Paragraph("Quick Reference Card", S_TITLE)],
        [Spacer(1, 4)],
        [Paragraph("Celiac Disease  •  Inflammatory Bowel Disease  •  Toddler's Diarrhea", S_SUBTITLE)],
        [Paragraph("Based on Ghai Essential Pediatrics (10th Edition)", S_NOTE)],
    ], colWidths=[17.7*cm])
    tbl.setStyle(TableStyle([
        ("BACKGROUND", (0,0), (-1,-1), DARK_BLUE),
        ("TOPPADDING",  (0,0), (-1,-1), 8),
        ("BOTTOMPADDING",(0,0),(-1,-1), 8),
        ("ROUNDEDCORNERS", [8]),
    ]))
    return tbl

# ── COMPARISON TABLE ─────────────────────────────────────────────
def main_comparison():
    W = 17.7*cm
    # col widths: feature | celiac | IBD-CD | IBD-UC | toddler
    cw = [3.2*cm, 3.6*cm, 3.6*cm, 3.6*cm, 3.7*cm]

    # Header row
    headers = [
        boldC("Feature"),
        Paragraph("🌾 Celiac Disease", S_LABEL),
        Paragraph("🔥 Crohn's Disease", S_LABEL),
        Paragraph("🩸 Ulcerative Colitis", S_LABEL),
        Paragraph("🍼 Toddler's Diarrhea", S_LABEL),
    ]

    rows = [headers]

    data = [
        ("Other Name",
         "Gluten-sensitive enteropathy",
         "Regional enteritis",
         "Idiopathic proctocolitis",
         "Functional diarrhea of childhood / Chronic non-specific diarrhea"),
        ("Age of Onset",
         "6 mo – 2 yr (after gluten intro); can present at any age",
         "Teens most common; can be any age >5 yr",
         "Teens; can be any age >5 yr",
         "1 – 4 years (toddler age group)"),
        ("Etiology / Pathogenesis",
         "Immune reaction to gliadin (wheat, rye, barley)\nHLA DQ2/DQ8 association",
         "Unknown; dysregulated immune response to gut flora\nTransmural inflammation",
         "Unknown; mucosal autoimmunity\nConcentrated in colon",
         "Functional; excessive fruit juice, low fat diet, high fluid intake\nNormal gut motility"),
        ("Stool Character",
         "Pale, bulky, frothy, offensive, floats (steatorrhoea)\nFrequency: 3–8/day",
         "Loose, often bloody with mucus\nNocturnal diarrhea common",
         "Bloody mucoid stools\nTenesmus common",
         "Loose watery stools with undigested food\nNo blood, no nocturnal symptoms\nChild thrives normally"),
        ("Key Clinical Features",
         "• Abdominal distension\n• Growth failure/FTT\n• Irritability, anorexia\n• Anemia (Fe/folate)\n• Wasted buttocks\n• Short stature",
         "• Colicky abdominal pain (RIF)\n• Perianal disease\n• Fistulae, abscesses\n• Mouth ulcers\n• Weight loss / FTT\n• Skip lesions",
         "• Bloody diarrhea\n• Rectal urgency\n• Diffuse colicky pain\n• Continuous mucosal disease\n• Rectum always involved",
         "• Well child, normal growth\n• No failure to thrive\n• No fever, no blood in stool\n• Diarrhea worse with juice/high sugar\n• Resolves by age 4–5 yr"),
        ("Extra-intestinal\nManifestations",
         "• Dermatitis herpetiformis\n• Short stature\n• Dental enamel defects\n• Osteoporosis\n• Peripheral neuropathy\n• Infertility",
         "• Arthritis/arthralgia\n• Uveitis/iritis\n• Erythema nodosum\n• Pyoderma gangrenosum\n• Growth failure\n• Primary sclerosing cholangitis (rare)",
         "• Arthritis\n• Uveitis\n• Erythema nodosum\n• Pyoderma gangrenosum\n• Primary sclerosing cholangitis (more common than CD)",
         "None"),
        ("Distribution",
         "Small bowel (duodenum/jejunum)\nDiffuse",
         "Any part: mouth to anus\nSkip lesions",
         "Colon only\nRectum → proximal; continuous",
         "Entire gut (functional)\nNo structural lesion"),
        ("Histology /\nEndoscopy",
         "• Villous atrophy\n• Crypt hyperplasia\n• ↑ Intraepithelial lymphocytes\n• Endoscopy: scalloped duodenal folds",
         "• Transmural inflammation\n• Non-caseating granulomas\n• Cobblestone mucosa\n• Deep ulcers, fissures",
         "• Mucosal/submucosal only\n• Crypt abscesses\n• Goblet cell depletion\n• Pseudopolyps\n• No granulomas",
         "Normal (no structural pathology)"),
        ("Key Investigations",
         "1. Anti-tTG IgA (screening)\n2. Total serum IgA (if deficient → IgG-based tests)\n3. Duodenal biopsy (gold standard)\n4. HLA DQ2/DQ8 typing",
         "1. ↑ ESR, CRP, fecal calprotectin\n2. Colonoscopy + biopsy\n3. MR enterography\n4. ASCA (anti-Saccharomyces)\n5. ↑ Fecal lactoferrin",
         "1. ↑ ESR, CRP\n2. Colonoscopy + biopsy (gold standard)\n3. p-ANCA positive in ~70%\n4. Fecal calprotectin ↑",
         "1. Stool routine/culture – normal\n2. Stool reducing substances – absent\n3. Diagnosis of exclusion\n4. Dietary history key"),
        ("Serological\nMarkers",
         "Anti-tTG IgA ✓\nAnti-endomysial antibody (EMA) ✓\nAnti-gliadin antibody (less specific)",
         "ASCA (anti-Saccharomyces cerevisiae antibody) +ve\np-ANCA –ve",
         "p-ANCA +ve (~70%)\nASCA –ve",
         "None (normal serology)"),
        ("Anemia",
         "Iron deficiency + folate/B12 deficiency\n(malabsorption)\nMicrocytic / megaloblastic",
         "Iron deficiency (chronic inflammation, GI loss)\n+ Anemia of chronic disease",
         "Iron deficiency (blood loss)\nAnemia of chronic disease",
         "Not present"),
        ("High-Risk Groups\n(to Screen)",
         "• Type 1 DM\n• Down syndrome\n• Turner/Williams syndrome\n• Autoimmune thyroid disease\n• IgA deficiency\n• First-degree relatives",
         "N/A",
         "N/A",
         "N/A"),
        ("Differential\nDiagnosis",
         "Giardiasis, cow milk protein allergy,\ntropical sprue, immunodeficiency",
         "Intestinal TB, infective colitis,\nbehçet's, celiac",
         "Infective colitis, allergic colitis,\nCrohn's colitis, polyps",
         "Giardiasis, toddler's osmotic diarrhea,\nceliac disease"),
        ("Treatment",
         "⭐ STRICT LIFELONG GLUTEN-FREE DIET\n• No wheat, rye, barley\n• Rice, maize, potato allowed\n• Supplement: Fe, folate, Ca, vitamin D",
         "• 5-ASA (mild)\n• Steroids (moderate-severe)\n• Azathioprine/6-MP (maintenance)\n• Biologics: infliximab, adalimumab\n• Nutrition: exclusive enteral nutrition (first line in children for CD induction)\n• Surgery: strictureplasty, resection",
         "• 5-ASA (mesalazine) – mainstay\n• Steroids (acute flare)\n• Azathioprine (steroid-sparing)\n• Biologics (infliximab) for severe\n• Surgery: colectomy (curative)",
         "⭐ DIETARY MODIFICATION\n• Reduce fruit juice/squash intake\n• Balanced fat intake\n• Avoid excessive fluids\n• Reassurance – self-limiting\n• No medications needed"),
        ("Prognosis",
         "Excellent on GFD\nRisk of lymphoma if non-compliant\nGrowth catch-up on diet",
         "Chronic relapsing course\nMay need surgery\nGrowth may be impaired",
         "Chronic relapsing course\nColectomy in refractory cases\nSlightly ↑ colorectal cancer risk (long-standing)",
         "Excellent – self-resolves by age 4–5 yr\nNo long-term complications"),
        ("Key\nMnemonic",
         "GFD = Gliadin-Free Diet\nHLA DQ2/DQ8 → Celiac",
         "SKIP (Skip lesions, Kids mainly, IBD-Granuloma, Perianal)",
         "RACE (Rectum always, Continuous, no granuloma, Endoscopy key)",
         "THRIVES (Toddler, Healthy, Resolves, Juice ↓, Exclusion dx, No fever/blood, Self-limiting)"),
    ]

    for feat, cel, cd, uc, tod in data:
        rows.append([
            P(feat, S_BOLD),
            P(cel, S_SMALL),
            P(cd, S_SMALL),
            P(uc, S_SMALL),
            P(tod, S_SMALL),
        ])

    tbl = Table(rows, colWidths=cw, repeatRows=1)

    ts = TableStyle([
        # Header row styling
        ("BACKGROUND", (0,0), (0,0), DARK_BLUE),
        ("BACKGROUND", (1,0), (1,0), MID_BLUE),
        ("BACKGROUND", (2,0), (2,0), GREEN),
        ("BACKGROUND", (3,0), (3,0), RED),
        ("BACKGROUND", (4,0), (4,0), ORANGE),
        ("TEXTCOLOR",  (0,0), (-1,0), WHITE),
        ("FONTNAME",   (0,0), (-1,0), "Helvetica-Bold"),
        ("FONTSIZE",   (0,0), (-1,0), 9),
        ("ALIGN",      (0,0), (-1,0), "CENTER"),
        ("VALIGN",     (0,0), (-1,0), "MIDDLE"),
        ("TOPPADDING", (0,0), (-1,0), 6),
        ("BOTTOMPADDING", (0,0), (-1,0), 6),

        # Alternating row colors
        ("ROWBACKGROUNDS", (0,1), (-1,-1), [WHITE, GREY_BG]),

        # Feature column background
        ("BACKGROUND", (0,1), (0,-1), LIGHT_BLUE),
        ("FONTNAME",   (0,1), (0,-1), "Helvetica-Bold"),
        ("FONTSIZE",   (0,1), (0,-1), 8),

        # Grid
        ("GRID",       (0,0), (-1,-1), 0.5, GREY_BORDER),
        ("LINEBELOW",  (0,0), (-1,0), 1.5, DARK_BLUE),

        # Padding
        ("TOPPADDING",    (0,1), (-1,-1), 5),
        ("BOTTOMPADDING", (0,1), (-1,-1), 5),
        ("LEFTPADDING",   (0,0), (-1,-1), 5),
        ("RIGHTPADDING",  (0,0), (-1,-1), 5),

        # Vertical alignment
        ("VALIGN", (0,0), (-1,-1), "TOP"),

        # Highlight treatment rows
        ("BACKGROUND", (1,14), (1,14), LIGHT_BLUE),
        ("BACKGROUND", (2,14), (2,14), LIGHT_GREEN),
        ("BACKGROUND", (3,14), (3,14), LIGHT_RED),
        ("BACKGROUND", (4,14), (4,14), LIGHT_ORANGE),

        # Highlight mnemonic row
        ("BACKGROUND", (0,16), (-1,16), YELLOW_BG),
    ])
    tbl.setStyle(ts)
    return tbl


# ── DIAGNOSTIC CRITERIA BOX ─────────────────────────────────────
def diagnostic_criteria():
    items = [
        # Celiac - Marsh Classification
        ("Celiac: Marsh Classification", MID_BLUE, LIGHT_BLUE, [
            ("Marsh 0", "Normal mucosa"),
            ("Marsh 1", "↑ Intraepithelial lymphocytes (>25/100 enterocytes) only"),
            ("Marsh 2", "Marsh 1 + crypt hyperplasia"),
            ("Marsh 3a", "Partial villous atrophy"),
            ("Marsh 3b", "Subtotal villous atrophy"),
            ("Marsh 3c", "Total villous atrophy (classic celiac)"),
        ]),
        # IBD - PCDAI
        ("IBD: Disease Activity Indices", GREEN, LIGHT_GREEN, [
            ("PCDAI", "Pediatric Crohn's Disease Activity Index (<10 = remission; >30 = severe)"),
            ("PUCAI", "Pediatric Ulcerative Colitis Activity Index (<10 = remission; ≥65 = severe)"),
            ("CRP + ESR", "Elevated in active IBD; correlate with disease activity"),
            ("Fecal calprotectin", ">200 µg/g = active intestinal inflammation (IBD > IBS)"),
            ("Endoscopy", "Required to confirm diagnosis and extent of disease"),
        ]),
        # Toddler's Diarrhea criteria
        ("Toddler's Diarrhea: Rome IV Criteria", ORANGE, LIGHT_ORANGE, [
            ("Duration", "Loose/unformed stools ≥4 weeks"),
            ("Age", "Onset between 6 months and 5 years"),
            ("Timing", "Stools during waking hours only (no nocturnal diarrhea)"),
            ("Thriving", "Child grows and develops normally"),
            ("Exclusion", "No failure to thrive, blood, fever, or significant abdominal pain"),
        ]),
    ]

    story_items = []
    for title, color, bg, entries in items:
        header = [[Paragraph(title, S_LABEL)]]
        header_tbl = Table(header, colWidths=[17.7*cm])
        header_tbl.setStyle(TableStyle([
            ("BACKGROUND", (0,0), (-1,-1), color),
            ("TOPPADDING", (0,0), (-1,-1), 5),
            ("BOTTOMPADDING", (0,0), (-1,-1), 5),
        ]))
        story_items.append(header_tbl)

        rows = []
        for k, v in entries:
            rows.append([P(k, S_BOLD), P(v, S_SMALL)])
        inner = Table(rows, colWidths=[4.5*cm, 13.2*cm])
        inner.setStyle(TableStyle([
            ("BACKGROUND", (0,0), (-1,-1), bg),
            ("GRID", (0,0), (-1,-1), 0.5, GREY_BORDER),
            ("TOPPADDING", (0,0), (-1,-1), 4),
            ("BOTTOMPADDING", (0,0), (-1,-1), 4),
            ("LEFTPADDING", (0,0), (-1,-1), 6),
            ("RIGHTPADDING", (0,0), (-1,-1), 6),
            ("VALIGN", (0,0), (-1,-1), "TOP"),
        ]))
        story_items.append(inner)
        story_items.append(Spacer(1, 6))

    return story_items


# ── QUICK COMPARISON HIGHLIGHT BOXES ────────────────────────────
def highlight_boxes():
    boxes = [
        ("CELIAC DISEASE\n★ Key Points", MID_BLUE, LIGHT_BLUE, [
            "Most common cause of chronic diarrhea in children >2 yr in North India",
            "Gold standard diagnosis: Duodenal biopsy (Marsh 3c = total villous atrophy)",
            "Best screening test: Anti-tTG IgA",
            "Treatment: Strict LIFELONG gluten-free diet (no wheat, rye, barley)",
            "Risk of T-cell lymphoma if non-compliant with GFD",
            "Screen high-risk groups: T1DM, Down, Turner, thyroid disease",
        ]),
        ("IBD IN CHILDREN\n★ Key Points", GREEN, LIGHT_GREEN, [
            "Crohn's: Transmural, any part of GI tract, skip lesions, granulomas",
            "UC: Mucosal only, colon (rectum always), continuous, no granulomas",
            "FIRST LINE induction in pediatric CD: Exclusive Enteral Nutrition (EEN)",
            "Biological therapy: Infliximab (anti-TNF) for moderate-severe IBD",
            "PSC (Primary Sclerosing Cholangitis): more associated with UC than CD",
            "Perianal disease (fistulae, abscesses): Hallmark of Crohn's disease",
        ]),
        ("TODDLER'S DIARRHEA\n★ Key Points", ORANGE, LIGHT_ORANGE, [
            "Age 1–4 years, THRIVING child — this is the most reassuring feature",
            "No blood, no nocturnal symptoms, no fever, no failure to thrive",
            "Caused by excess fruit juice, high carb diet, low fat intake",
            "Treatment: Dietary advice only — reduce juice, balanced fat intake",
            "Self-limiting: resolves by age 4–5 years",
            "Diagnosis of exclusion — rule out giardia, celiac, cow milk allergy",
        ]),
    ]

    cols = []
    for title, color, bg, points in boxes:
        rows = [[Paragraph(title.replace('\n', '<br/>'), S_LABEL)]]
        for pt in points:
            rows.append([P("• " + pt, S_SMALL)])
        inner = Table(rows, colWidths=[5.5*cm])
        inner.setStyle(TableStyle([
            ("BACKGROUND", (0,0), (0,0), color),
            ("BACKGROUND", (0,1), (-1,-1), bg),
            ("GRID", (0,0), (-1,-1), 0.5, GREY_BORDER),
            ("TOPPADDING", (0,0), (-1,-1), 5),
            ("BOTTOMPADDING", (0,0), (-1,-1), 5),
            ("LEFTPADDING", (0,0), (-1,-1), 6),
            ("RIGHTPADDING", (0,0), (-1,-1), 6),
            ("VALIGN", (0,0), (-1,-1), "TOP"),
            ("ALIGN", (0,0), (-1,0), "CENTER"),
        ]))
        cols.append(inner)

    outer = Table([cols], colWidths=[5.7*cm, 5.7*cm, 5.7*cm], hAlign='CENTER')
    outer.setStyle(TableStyle([
        ("LEFTPADDING",  (0,0), (-1,-1), 3),
        ("RIGHTPADDING", (0,0), (-1,-1), 3),
        ("VALIGN",       (0,0), (-1,-1), "TOP"),
    ]))
    return outer


# ── FOOTER ───────────────────────────────────────────────────────
def footer():
    tbl = Table([[
        Paragraph("Based on: Ghai Essential Pediatrics, 10th Edition | Chapter 12: Diseases of Gastrointestinal System & Liver", S_NOTE),
        Paragraph("Quick Reference Card — For Educational Use Only", S_NOTE),
    ]], colWidths=[11*cm, 6.7*cm])
    tbl.setStyle(TableStyle([
        ("BACKGROUND", (0,0), (-1,-1), DARK_BLUE),
        ("TOPPADDING", (0,0), (-1,-1), 5),
        ("BOTTOMPADDING", (0,0), (-1,-1), 5),
        ("LEFTPADDING", (0,0), (-1,-1), 8),
        ("RIGHTPADDING", (0,0), (-1,-1), 8),
        ("TEXTCOLOR", (0,0), (-1,-1), LIGHT_BLUE),
        ("ALIGN", (1,0), (1,0), "RIGHT"),
    ]))
    return tbl


# ── BUILD STORY ──────────────────────────────────────────────────
story = []

story.append(title_block())
story.append(Spacer(1, 8))
story.append(section_banner("COMPARATIVE TABLE: CELIAC DISEASE  vs  IBD  vs  TODDLER'S DIARRHEA"))
story.append(Spacer(1, 4))
story.append(main_comparison())
story.append(Spacer(1, 10))
story.append(section_banner("DIAGNOSTIC CRITERIA & DISEASE ACTIVITY INDICES", GREEN))
story.append(Spacer(1, 4))
story.extend(diagnostic_criteria())
story.append(Spacer(1, 8))
story.append(section_banner("CLINICAL PEARLS AT A GLANCE", PURPLE))
story.append(Spacer(1, 6))
story.append(highlight_boxes())
story.append(Spacer(1, 10))
story.append(footer())

doc.build(story)
print(f"PDF generated: {OUTPUT}")

Running Command

python3 /home/daytona/workspace/gi-quickref/generate_pdf.py 2>&1

Running Command

ls -lh /home/daytona/workspace/gi-quickref/Pediatric_GI_QuickRef.pdf

Your quick reference PDF is ready:

Pediatric GI QuickRef

PDF Document · PDF

Here's what's packed into the PDF:

Section 1 - Master Comparison Table (16 rows × 5 columns) Covers: Celiac Disease | Crohn's Disease | Ulcerative Colitis | Toddler's Diarrhea - comparing:

Other names, age of onset, etiology/pathogenesis
Stool character, key clinical features
Extra-intestinal manifestations, distribution, histology/endoscopy
Key investigations, serological markers, anemia
Differential diagnosis, treatment, prognosis
Memory mnemonics for each condition

Section 2 - Diagnostic Criteria

Celiac: Marsh Classification (0 → 3c) with descriptions
IBD: PCDAI and PUCAI activity indices, fecal calprotectin thresholds
Toddler's Diarrhea: Rome IV criteria

Section 3 - Clinical Pearls at a Glance Three colour-coded boxes with high-yield exam bullet points per condition:

Celiac: anti-tTG, GFD, lymphoma risk, who to screen
IBD: EEN for pediatric Crohn's, infliximab, PSC association, perianal disease
Toddler's: "thriving child" as key feature, dietary management, self-limiting course

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