Master Medicine & Allied
for PMDC NLE Step 1

What the PMDC NLE Step 1 Tests in Medicine & Allied

The PMDC NLE Step 1 Medicine & Allied section tests the ability to diagnose and manage common adult and paediatric medical conditions, with emphasis on clinical presentations, diagnostic criteria, and first-line therapies. Candidates must demonstrate knowledge of evidence-based guidelines for hypertension (JNC 8/ISH), diabetes mellitus (ADA/WHO criteria), asthma (GINA), COPD (GOLD), and heart failure (NYHA classification, ejection fraction thresholds). Infectious diseases (e.g., tuberculosis, malaria, HIV, typhoid) require knowledge of diagnostic tests (GeneXpert, RDTs, Widal) and treatment protocols (DOTS, ACTs, ART). Renal medicine focuses on AKI (KDIGO stages), CKD (eGFR cut-offs), and electrolyte disorders. Gastroenterology tests criteria for cirrhosis (Child-Pugh), pancreatitis (Ranson’s), and peptic ulcer management. Neurology covers stroke (NIHSS, thrombolysis window), epilepsy (ILAE classification), and meningitis (CSF analysis). Endocrine topics include thyroid disorders (TSH, T4), adrenal insufficiency (ACTH stimulation test), and osteoporosis (DEXA T-score). Rheumatology tests SLE (SLICC criteria), rheumatoid arthritis (ACR/EULAR), and gout (urate targets).

High-Yield Concepts

• Hypertension – JNC 8/ISH Targets: For adults ≥60 years, target BP <150/90; for 18-59 years or with diabetes/CKD, target <140/90. First-line: thiazide-like diuretics (chlorthalidone) or CCBs (amlodipine) in non-black patients; in black patients, start with CCB or thiazide. ACEi/ARB are first-line if CKD or diabetes with albuminuria.
• Diabetes Mellitus – ADA Diagnostic Criteria: Fasting plasma glucose ≥7.0 mmol/L (126 mg/dL) or 2-hour OGTT ≥11.1 mmol/L (200 mg/dL) or HbA1c ≥6.5% (48 mmol/mol) or random glucose ≥11.1 mmol/L with symptoms. First-line metformin if no contraindications; target HbA1c <7% (53 mmol/mol) for most adults.
• Asthma – GINA Stepwise Management: Step 1: as-needed low-dose ICS-formoterol (e.g., budesonide-formoterol 200/6). Step 2: low-dose ICS plus as-needed SABA. Step 3: low-dose ICS-LABA. Step 4: medium-dose ICS-LABA. Step 5: add LAMA (tiotropium), consider anti-IgE (omalizumab) or anti-IL5 (mepolizumab).
• Heart Failure – NYHA and Treatment: NYHA I: no limitation; II: slight limitation; III: marked limitation; IV: symptoms at rest. For HFrEF (EF ≤40%): ACEi/ARB + beta-blocker (bisoprolol, carvedilol) + MRA (spironolactone) + SGLT2i (dapagliflozin). For HFpEF (EF ≥50%): treat comorbidities, consider SGLT2i.
• Tuberculosis – Diagnosis and DOTS: GeneXpert MTB/RIF is first-line for pulmonary TB (sputum) and rifampicin resistance. Standard regimen: 2 months of isoniazid, rifampicin, pyrazinamide, ethambutol (HRZE) followed by 4 months of HR. For latent TB: isoniazid 300 mg daily for 6-9 months or rifampicin 4 months.
• Acute Kidney Injury – KDIGO Staging: Stage 1: SCr increase ≥26.5 µmol/L (0.3 mg/dL) or 1.5-1.9× baseline, or urine output <0.5 mL/kg/h for 6-12 hours. Stage 2: SCr 2.0-2.9× baseline, urine output <0.5 mL/kg/h for ≥12 hours. Stage 3: SCr ≥3.0× baseline or ≥353.6 µmol/L (4.0 mg/dL) or initiation of RRT.
• Meningitis – CSF Analysis: Bacterial: WBC >1000/µL (neutrophils), glucose <2.2 mmol/L (40 mg/dL), protein >1.5 g/L (150 mg/dL). Viral: WBC 10-1000/µL (lymphocytes), glucose normal, protein mildly elevated. Tuberculous: WBC 50-500/µL (lymphocytes), glucose low, protein >2.0 g/L. Empirical therapy: ceftriaxone 2 g IV q12h + vancomycin + dexamethasone.
• Rheumatoid Arthritis – ACR/EULAR Criteria: Score ≥6/10: joint involvement (1 large joint=0, 2-10 large=1, 1-3 small=2, 4-10 small=3, >10 small=5), serology (RF or anti-CCP low-positive=2, high-positive=3), acute phase reactants (CRP/ESR elevated=1), symptom duration ≥6 weeks=1. First-line DMARD: methotrexate 15-25 mg weekly with folic acid.

Common Traps in Medicine & Allied Questions

• Confusing target BP for elderly (≥60 years: <150/90) with younger adults (<140/90).
• Using HbA1c alone for diabetes diagnosis in pregnancy or haemoglobinopathies – must use OGTT.
• Ordering a CT head before lumbar puncture in suspected meningitis without checking for signs of raised ICP (papilloedema, focal deficits, GCS <13).
• In heart failure, starting beta-blocker before ACEi in acute decompensation – must stabilise first.
• Assuming all AKI with oliguria requires urgent dialysis – check for refractory hyperkalaemia, severe acidosis, or uraemic pericarditis.
• Misinterpreting a positive Widal test as definitive for typhoid – false positives occur in endemic areas; culture or PCR is gold standard.

How to Revise Medicine & Allied for the PMDC NLE Step 1

Prioritise memorising diagnostic thresholds (e.g., BP, HbA1c, eGFR, CSF glucose) and first-line drug choices with doses. Questions often present a clinical vignette with lab values and ask for the next best step in diagnosis or management – practise recognising patterns (e.g., hypertensive urgency vs emergency, DKA vs HHS). Focus on guideline-based algorithms (GINA, GOLD, KDIGO, JNC 8). Review common infections (TB, malaria, typhoid, hepatitis) with local resistance patterns. Use spaced repetition for criteria (Child-Pugh, Ranson’s, NIHSS, SLICC). Spend time on ECG interpretation (STEMI, atrial fibrillation, hyperkalaemia) and ABG analysis. Simulate timed question sets with 60-90 seconds per item to build speed.

Practise it: MedLumen has 50 Medicine & Allied questions for the PMDC NLE Step 1, each with a full explanation and references.