ANC visits
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Antenatal Care (ANC) Visits
Overview
ANC is a systematic program of scheduled pregnancy monitoring designed to promote maternal and fetal health, detect complications early, and provide preventive interventions. The WHO (2016 updated guidelines) recommends a minimum of 8 contacts (up from the previous 4), with 5 of those contacts occurring in the third trimester.
WHO Recommended ANC Schedule (8-Contact Model)
| Contact | Timing | Key Activities |
|---|---|---|
| 1 | Up to 12 weeks | Confirm pregnancy, full history, booking investigations, dating USS, counseling |
| 2 | 20 weeks | Anomaly scan (USS), review results, nutritional counseling |
| 3 | 26 weeks | BP, urine dipstick, fetal growth assessment, review complications |
| 4 | 30 weeks | BP, urine, symphysis-fundal height (SFH), repeat investigations if indicated |
| 5 | 34 weeks | BP, urine, fetal presentation, OGTT results review, group B Strep |
| 6 | 36 weeks | Fetal presentation, USS if malpresentation suspected, birth planning |
| 7 | 38 weeks | BP, urine, fetal wellbeing, check for complications |
| 8 | 40 weeks | BP, urine, SFH, post-dates counseling, induction planning |
An additional contact at 41 weeks is recommended if the woman has not delivered, to discuss post-term management.
First ANC Visit (Booking Visit) — Up to 12 Weeks
History
- LMP, cycle regularity, EDD calculation
- Obstetric history: parity, previous CS, complications, neonatal outcomes
- Medical/surgical history, medications, allergies
- Family history (genetic conditions, DM, hypertension)
- Social history: smoking, alcohol, substance use, domestic violence screening
Examination
- Weight, height, BMI calculation
- Blood pressure (baseline)
- Cardiovascular and respiratory examination
- Abdominal examination (uterine size)
- Breast and pelvic examination (if indicated)
Investigations (Booking Bloods)
| Investigation | Purpose |
|---|---|
| Full blood count (FBC) | Anemia, thrombocytopenia |
| Blood group & Rh typing | Rhesus status, antibody screen |
| VDRL/RPR | Syphilis screening |
| HIV test | PMTCT planning |
| Hepatitis B (HBsAg) | Neonatal immunization planning |
| Hepatitis C | Vertical transmission risk |
| Rubella IgG | Immunity status |
| Urinalysis & MSU | Asymptomatic bacteriuria, proteinuria |
| Thyroid function (TSH) | Subclinical hypothyroidism |
| Random/fasting blood glucose | Diabetes screening |
| Cervical smear (if due) | Cervical pathology |
Ultrasound
- Dating scan (ideally 11–13+6 weeks): confirm viability, gestational age, chorionicity in multiples, nuchal translucency (NT) for Down syndrome screening
Ongoing ANC Visit Components (Every Visit)
At each contact, the following are assessed:
- Blood pressure — screen for gestational hypertension/pre-eclampsia
- Urinalysis — proteinuria, glucose, nitrites, leukocytes
- Weight gain — assess nutritional status
- Symphysis-fundal height (SFH) — from 24 weeks, plotted on customized growth chart
- Fetal heart rate — auscultation (Doppler)
- Fetal presentation — from 36 weeks (external cephalic version if breech)
- Fetal movements — maternal awareness from 28 weeks
- Edema — pre-eclampsia, dependent edema
- Emotional wellbeing — depression, anxiety screening (e.g., Edinburgh Postnatal Depression Scale can be used antenatally)
Key Preventive Interventions During ANC
| Intervention | Timing | Notes |
|---|---|---|
| Folic acid 400–5000 mcg/day | Preconception – 12 weeks | Reduces neural tube defects |
| Iron supplementation | As indicated / routinely in low-income settings | Prevent/treat iron-deficiency anemia |
| Low-dose aspirin 75–150 mg/day | From 12 weeks | High-risk pre-eclampsia prevention |
| Calcium supplementation | From 20 weeks | Pre-eclampsia prevention in low-calcium populations |
| Tdap vaccine | 27–36 weeks | Pertussis protection for neonate |
| Influenza vaccine | Any trimester | Safe in pregnancy |
| Anti-D prophylaxis | 28 weeks + postnatal | Rh-negative women |
| ITN/malaria prophylaxis (IPTp-SP) | From 13 weeks in endemic areas | Intermittent preventive therapy |
Second Trimester Specific
- Anomaly scan (18–22 weeks): Structural survey of fetal organs, placental location, amniotic fluid volume
- Combined/quadruple screening or NIPT (cell-free DNA): Chromosomal anomaly screening
- OGTT (24–28 weeks): Gestational diabetes mellitus (GDM) screening (especially high-risk: BMI >30, previous GDM, family history, macrosomia, polyhydramnios)
- Cervical length assessment: In women at risk for preterm birth
Third Trimester Specific
- Repeat FBC — re-screen for anemia
- Repeat antibody screen (Rh-negative women)
- Repeat blood glucose if GDM risk
- Group B Streptococcus (GBS) swab — 35–37 weeks (where applicable)
- Intrapartum care planning: Mode of delivery discussion, birth plan, pain management
- Breastfeeding counseling
- Signs of labor/danger signs — when to go to hospital
Danger Signs to Counsel on at Every Visit
Patients should be told to seek immediate care for:
- Severe headache, visual disturbances, epigastric pain → Pre-eclampsia/eclampsia
- Vaginal bleeding → Placenta praevia, abruption
- Reduced fetal movements
- Fever, dysuria, loin pain → UTI/pyelonephritis
- Premature rupture of membranes (PROM)
- Severe vomiting / inability to keep fluids down
Focused ANC (FANC) — 4-Visit Model
Some settings still use the older 4-visit focused ANC model (WHO pre-2016):
- Visit 1: <16 weeks
- Visit 2: 24–28 weeks
- Visit 3: 32 weeks
- Visit 4: 36 weeks
The 8-contact model is preferred as it is associated with fewer perinatal deaths and better maternal satisfaction.
Multidisciplinary and Special Considerations
| Condition | ANC Modification |
|---|---|
| Hypertension | More frequent BP monitoring, anti-hypertensives, serial growth scans |
| GDM | Dietary management, insulin if needed, serial growth scans, IOL at 38–40 weeks |
| Multiple pregnancy | More frequent visits, early delivery planning, specialist care |
| HIV-positive | PMTCT regimen, viral load monitoring, mode of delivery counseling |
| Cardiac disease | Cardiologist co-management, delivery planning |
| Previous CS | Scar assessment, IOL vs. VBAC counseling |
Shock types and management
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Shock: Types and Management
Definition
Shock is a life-threatening state of circulatory failure resulting in inadequate oxygen delivery (DO₂) to meet cellular metabolic demands, leading to cellular hypoxia, organ dysfunction, and if untreated, death.
Key equation: DO₂ = CO × CaO₂ (where CaO₂ = Hb × SaO₂ × 1.34 + PaO₂ × 0.0031)
Classification — Four Major Types
According to Harrison's Principles of Internal Medicine (p. 8234), shock is categorized into four major types based on the primary physiologic derangement:
| Type | Core Mechanism | Examples |
|---|---|---|
| Distributive | Pathologic vasodilation → maldistribution of blood flow | Septic, anaphylactic, neurogenic, adrenal crisis |
| Cardiogenic | Pump failure → reduced cardiac output | MI, acute heart failure, severe arrhythmia, myocarditis |
| Hypovolemic | Reduced preload due to volume loss | Hemorrhage, dehydration, burns, third-spacing |
| Obstructive | Mechanical obstruction to blood flow | Pulmonary embolism, cardiac tamponade, tension pneumothorax, aortic dissection |
Hemodynamic Profiles
| Parameter | Distributive | Cardiogenic | Hypovolemic | Obstructive |
|---|---|---|---|---|
| CO/CI | ↑ (early) | ↓↓ | ↓ | ↓ |
| SVR | ↓↓ | ↑ | ↑ | ↑ |
| CVP/Preload | ↓ or normal | ↑ | ↓↓ | ↑ (tamponade/PE) or ↓ (tension PTX) |
| PCWP | ↓ or normal | ↑↑ | ↓↓ | Variable |
| SvO₂ | ↑ (maldistribution) | ↓ | ↓ | ↓ |
| Skin | Warm, flushed (early) | Cold, clammy | Cold, clammy | Cold, clammy |
Clinical Recognition
Common Features of All Shock Types
- Hypotension (SBP <90 mmHg or MAP <65 mmHg) — not always present early
- Tachycardia
- Altered mental status / agitation / confusion
- Oliguria (<0.5 mL/kg/hr)
- Elevated lactate (>2 mmol/L indicates hypoperfusion)
- Cool peripheries / mottling (except early distributive)
Type-Specific Clues
| Type | Clinical Pointers |
|---|---|
| Septic | Fever/hypothermia, leukocytosis, known infection source, warm peripheries early |
| Anaphylactic | Urticaria, angioedema, bronchospasm, allergen exposure |
| Neurogenic | Spinal cord injury, bradycardia + hypotension (loss of sympathetic tone) |
| Cardiogenic | Chest pain, pulmonary edema (crackles, S3), elevated JVP, poor LV function on echo |
| Hemorrhagic | Trauma, GI bleed, AAA rupture, obvious blood loss |
| Tamponade | Beck's triad (hypotension, JVD, muffled heart sounds), pulsus paradoxus |
| Tension PTX | Absent breath sounds, tracheal deviation, post-trauma or ventilated patient |
| PE | Sudden dyspnea, pleuritic chest pain, DVT risk factors, right heart strain on ECG |
Initial Management (Undifferentiated Shock)
Per Harrison's (p. 8249): "Because shock can progress rapidly to an irreversible stage, a key principle in shock management is to initiate treatment for circulatory shock simultaneous with efforts to elucidate shock etiology."
Immediate Actions (All Types)
- Airway — secure airway; intubate if GCS ≤8 or severe respiratory distress
- Breathing — supplemental O₂; target SpO₂ >94%
- Circulation — large-bore IV access (×2) or central line; arterial line for continuous BP monitoring
- Position — supine with legs elevated (Trendelenburg) unless cardiogenic/respiratory compromise
- Labs: ABG, lactate, FBC, U&E, LFTs, coagulation, blood cultures ×2, cross-match, troponin, BNP, ECG
- Bedside echo (POCUS): Rapidly differentiates type (LV function, pericardial effusion, IVC collapsibility, B-lines)
- Foley catheter — monitor urine output hourly
- Target: MAP ≥65 mmHg, lactate clearance, UO >0.5 mL/kg/hr
Type-Specific Management
1. Distributive Shock
Septic Shock (Most Common)
Follows the Surviving Sepsis Campaign (Hour-1 Bundle):
- Fluid resuscitation: 30 mL/kg IV crystalloid (balanced solution — Ringer's lactate preferred over normal saline) within 3 hours; reassess with dynamic fluid responsiveness markers (pulse pressure variation, PLR)
- Vasopressors: Norepinephrine is first-line (target MAP ≥65 mmHg); add vasopressin 0.03 U/min as second agent; dopamine only if bradycardia present
- Antibiotics: Broad-spectrum IV antibiotics within 1 hour of recognition; de-escalate based on cultures
- Source control: Drain abscess, remove infected device
- Steroids: Hydrocortisone 200 mg/day IV if refractory to vasopressors
- Blood transfusion: Target Hb ≥7 g/dL (or ≥9 if cardiac ischemia)
Anaphylactic Shock
- Epinephrine 0.5 mg IM (1:1000) into anterolateral thigh — first and most critical step
- Repeat every 5–15 min if no response
- Lay flat, elevate legs; O₂ 15 L/min
- IV fluid bolus (1–2 L crystalloid)
- IV epinephrine infusion if refractory
- Antihistamines (chlorphenamine), corticosteroids (hydrocortisone) — adjuncts only, not primary treatment
- Salbutamol nebulizer for bronchospasm
- Observe ≥6 hours (risk of biphasic reaction)
Neurogenic Shock
- IV fluids cautiously
- Vasopressors: Norepinephrine or phenylephrine (avoid agents that worsen bradycardia)
- Atropine or pacing for bradycardia
- Spinal immobilization; neurosurgical consultation
2. Cardiogenic Shock
- Identify and treat cause: PCI for acute MI (within 120 min door-to-balloon) — revascularization is the priority
- Avoid aggressive fluids (worsen pulmonary edema)
- Vasopressors/inotropes:
- Norepinephrine: first-line vasopressor
- Dobutamine: first-line inotrope (add if low CO with adequate BP)
- Avoid dopamine (higher arrhythmia risk)
- Diuresis (furosemide) if signs of fluid overload/pulmonary edema
- Mechanical circulatory support:
- Intra-aortic balloon pump (IABP)
- Impella (percutaneous LVAD)
- ECMO (extracorporeal membrane oxygenation) — in refractory cases
- Treat arrhythmias (cardioversion, antiarrhythmics)
- Avoid β-blockers and ACE inhibitors acutely
3. Hypovolemic Shock
Hemorrhagic Shock (4-Class System)
| Class | Blood Loss | HR | BP | RR | GCS | Treatment |
|---|---|---|---|---|---|---|
| I | <750 mL (<15%) | <100 | Normal | 14–20 | Normal | Crystalloid |
| II | 750–1500 mL (15–30%) | 100–120 | Normal/↓ | 20–30 | Anxious | Crystalloid ± colloid |
| III | 1500–2000 mL (30–40%) | 120–140 | ↓ | 30–40 | Confused | Blood products |
| IV | >2000 mL (>40%) | >140 | ↓↓ | >35 | Lethargic | Massive transfusion |
- Hemorrhage control: Direct pressure, tourniquet, operative intervention
- Massive Transfusion Protocol (MTP): Ratio 1:1:1 (pRBC : FFP : platelets) — avoid dilutional coagulopathy
- Permissive hypotension: Target SBP 80–90 mmHg until surgical hemorrhage control (except TBI — maintain CPP)
- Tranexamic acid (TXA): 1 g IV within 3 hours of injury; reduces mortality
- Avoid excessive crystalloid (causes dilutional coagulopathy, hypothermia, acidosis — the "lethal triad")
Non-Hemorrhagic (Dehydration, GI losses)
- IV crystalloid resuscitation (Ringer's lactate or Hartmann's)
- Identify and treat underlying cause
- Replace electrolytes
4. Obstructive Shock
Cardiac Tamponade
- Pericardiocentesis — emergent needle decompression (subxiphoid approach)
- Surgical pericardial window if recurrent
- Volume loading as temporizing measure (cautiously)
- Avoid vasodilators, diuretics
Tension Pneumothorax
- Immediate needle decompression — 2nd intercostal space, midclavicular line (or 4th/5th ICS, anterior axillary line)
- Followed by chest drain (tube thoracostomy)
- Do NOT wait for imaging if clinically suspected
Massive Pulmonary Embolism
- Systemic thrombolysis: Alteplase 100 mg IV over 2 hours — for massive PE with hemodynamic compromise
- Anticoagulation: Unfractionated heparin (UFH) IV bolus + infusion
- Surgical embolectomy or catheter-directed thrombolysis if thrombolysis contraindicated
- Supportive: O₂, cautious fluids (avoid RV overdistension), vasopressors (norepinephrine for RV failure)
Monitoring Targets in Shock Resuscitation
| Parameter | Target |
|---|---|
| MAP | ≥65 mmHg (≥80–85 in chronic hypertensives) |
| Urine output | >0.5 mL/kg/hr |
| Lactate | Clearance ≥10% per 2 hours; normalize within 6 hours |
| ScvO₂ | >70% (central venous) |
| SpO₂ | >94% |
| pH | >7.35 |
Pitfalls to Avoid
- Diagnosing shock based on BP alone — lactate elevation may precede hypotension ("cryptic shock")
- Over-resuscitation with crystalloids in septic shock → pulmonary edema, abdominal compartment syndrome
- Fluid loading in cardiogenic shock — worsens outcomes
- Delaying source control (drainage, PCI, thoracostomy) while continuing resuscitation
- Missing obstructive causes — always consider tamponade/tension PTX in undifferentiated shock
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