Master Adult Health (Medicine)
for AMC Cat 1

What the AMC Cat 1 Tests in Adult Health (Medicine)

The AMC Category 1 Adult Health (Medicine) exam tests your ability to manage common and critical medical presentations in adults, focusing on diagnosis, initial management, and risk stratification. You must demonstrate knowledge of evidence-based guidelines for conditions such as acute coronary syndromes, heart failure, pneumonia, diabetes emergencies, and electrolyte disturbances. The exam emphasises clinical decision-making: when to admit, when to use specific therapies (e.g., thrombolysis vs. PCI in STEMI), and how to interpret key investigations (ECG, ABG, troponin, eGFR). You are expected to know first-line drug choices, dosages, and contraindications, as well as validated scoring systems (e.g., CURB-65, CHA₂DS₂-VASc, Wells criteria). Questions often present a clinical scenario requiring selection of the most appropriate next step in management, not just the diagnosis.

High-Yield Concepts

• Acute Coronary Syndrome (ACS) Management: For STEMI: door-to-balloon time <90 min for primary PCI; if PCI not available within 120 min, give fibrinolysis (tenecteplase or alteplase) with contraindications (e.g., recent stroke, active bleeding). Adjunctive therapy: dual antiplatelet (aspirin 300 mg loading + ticagrelor 180 mg or prasugrel 60 mg), anticoagulation (unfractionated heparin or enoxaparin). For NSTEMI: risk stratify using GRACE score; high-risk (e.g., dynamic ECG changes, troponin rise) → early invasive strategy within 24h.
• Heart Failure: Acute Decompensation: First-line in acute pulmonary oedema: IV furosemide 40-80 mg (or 2.5x oral dose), nitrates (GTN infusion if SBP >110 mmHg), non-invasive ventilation (CPAP). Avoid beta-blockers acutely. Discharge regimen: ACE inhibitor (e.g., ramipril 2.5 mg BD) + beta-blocker (bisoprolol 1.25 mg OD) + spironolactone 25 mg OD if LVEF <35%. Target doses: ramipril 10 mg daily, bisoprolol 10 mg daily.
• Community-Acquired Pneumonia (CAP) Severity and Treatment: Use CURB-65: Confusion (AMTS ≤8), Urea >7 mmol/L, RR ≥30/min, BP <90/60, age ≥65. Score 0-1: treat at home with amoxicillin 500 mg TDS (or doxycycline if allergic). Score 2: admit, give co-amoxiclav 1.2 g TDS IV + clarithromycin 500 mg BD IV. Score ≥3: severe CAP, add IV fluids, consider ICU; first-line: piperacillin-tazobactam 4.5 g QDS + clarithromycin.
• Diabetic Ketoacidosis (DKA) Management: Diagnosis: glucose >13.9 mmol/L, pH <7.3, bicarbonate <15 mmol/L, ketonaemia ≥3 mmol/L. Fluid resuscitation: 1L 0.9% saline over 1 hour, then 1L over 2h, then 1L over 4h. Fixed-rate insulin infusion 0.1 units/kg/hour (not sliding scale). Replace potassium when K+ <5.5 mmol/L: add 40 mmol/L KCl to each litre of fluid. Monitor glucose hourly; when glucose <14 mmol/L, switch to 5% dextrose with 0.45% saline.
• Hyponatraemia: Diagnosis and Treatment: First step: assess volume status. Hypovolaemic: 0.9% saline. Euvolaemic (SIADH): fluid restriction (800 mL/day); consider tolvaptan if severe (<125 mmol/L with symptoms). Hypervolaemic (heart failure/cirrhosis): fluid restrict + loop diuretic. Do not correct faster than 8 mmol/L in 24h (risk of osmotic demyelination). For severe symptoms (seizures, coma): 100 mL 3% saline over 10 min, repeat once if no improvement.
• Atrial Fibrillation: Rate vs Rhythm Control and Anticoagulation: Rate control first-line: beta-blocker (bisoprolol 5 mg OD) or rate-limiting calcium channel blocker (diltiazem 60 mg TDS). Rhythm control (e.g., amiodarone) if symptomatic despite rate control or <48h duration. Anticoagulate using CHA₂DS₂-VASc score: ≥2 in men, ≥3 in women → start DOAC (apixaban 5 mg BD or rivaroxaban 20 mg OD). Use HAS-BLED score to assess bleeding risk; if ≥3, address modifiable factors.
• Acute Kidney Injury (AKI) Staging and Initial Management: AKI staging by creatinine rise: Stage 1: 1.5-1.9x baseline or ≥26.5 µmol/L increase; Stage 2: 2-2.9x; Stage 3: ≥3x or initiation of RRT. Immediate actions: stop nephrotoxins (NSAIDs, ACEi, diuretics), fluid challenge if hypovolaemic (500 mL 0.9% saline over 15 min), check urine output, renal ultrasound to exclude obstruction. Indications for RRT: refractory hyperkalaemia (K+ >6.5), severe acidosis (pH <7.15), uraemic pericarditis.
• Pulmonary Embolism: Diagnosis and Treatment: Use Wells score: ≤4 points = PE unlikely → D-dimer (age-adjusted: age × 0.1 mg/L if >50y). >4 points = PE likely → CT pulmonary angiogram. Anticoagulation: start LMWH (enoxaparin 1.5 mg/kg OD) or fondaparinux immediately. For haemodynamically unstable (SBP <90): thrombolysis (alteplase 50 mg IV bolus). DOACs (apixaban 10 mg BD for 7 days, then 5 mg BD) for stable patients.

Common Traps in Adult Health (Medicine) Questions

• Using sliding-scale insulin alone in DKA instead of fixed-rate infusion with potassium replacement.
• Giving beta-blockers acutely in acute heart failure before stabilisation with diuretics and vasodilators.
• Forgetting to adjust D-dimer cut-off for age (age × 0.1 mg/L in patients >50 years) leading to false positives.
• Starting anticoagulation in atrial fibrillation without calculating CHA₂DS₂-VASc score, or using aspirin as prophylaxis.
• Overcorrecting hyponatraemia with rapid saline infusion without monitoring correction rate, risking osmotic demyelination.
• Choosing a DOAC in a patient with mechanical heart valve or antiphospholipid syndrome (contraindicated; use warfarin).

How to Revise Adult Health (Medicine) for the AMC Cat 1

For AMC Cat 1 Adult Health (Medicine), prioritise high-acuity presentations: chest pain, breathlessness, altered consciousness, and electrolyte abnormalities. Questions are scenario-based with multiple steps: identify the condition, then select the most appropriate immediate or next-step management. Practise applying validated scoring systems (CURB-65, CHA₂DS₂-VASc, GRACE, Wells) rapidly. Focus on guideline-recommended first-line drugs, doses, and routes (e.g., IV vs oral), and common contraindications. Be precise with cut-off values (e.g., DKA glucose >13.9, pH <7.3). Review the 2023 ESC and BTS guidelines for ACS, AF, and CAP. Do not waste time on rare diseases; the exam tests bread-and-butter medicine with an emphasis on safe, evidence-based decision-making.

Practise it: MedLumen has 100 Adult Health (Medicine) questions for the AMC Cat 1, each with a full explanation and references.