NRE Step 1 Medicine High-Yield Topics 2026 — Cardiovascular, Respiratory & Endocrine
The clinical medicine topics that dominate NRE Step 1 — the conditions, investigations, and management decisions that appear in every attempt.
A 55-year-old man presents with chest pain radiating to the left arm, diaphoresis, and an ECG showing ST elevation in leads II, III, and aVF. What is the diagnosis, what is the immediate management, and which artery is most likely occluded?
This is the kind of question NRE Step 1 asks. Not “what is the definition of myocardial infarction.” Not “list the causes of chest pain.” It presents a patient, gives you clinical data, and asks you to decide — fast and correctly.
Medicine accounts for the largest share of NRE Step 1 MCQs. Within medicine, three systems dominate: cardiovascular, respiratory, and endocrine. Together they represent the majority of clinical science questions in every NRE session. This guide covers the specific conditions, investigation findings, and management steps you must know cold before sitting the exam.
1. Cardiovascular Medicine — The Highest-Yield System
No system is tested more frequently in NRE Step 1 than the heart. Every attempt has multiple cardiology questions, and they appear in different formats — diagnosis, investigation interpretation, acute management, and long-term drug choice. You cannot afford to leave any of the following topics underprepared.
Acute Coronary Syndrome (ACS)
ACS is the single most tested cardiovascular topic. Know the three presentations and how to distinguish them.
| Type | ECG Finding | Troponin | Immediate Management |
|---|---|---|---|
| STEMI | ST elevation in ≥2 contiguous leads | Raised (rises over hours) | Primary PCI within 90 min; if unavailable → thrombolysis. Aspirin + clopidogrel + anticoagulant + oxygen if SpO₂ <94% |
| NSTEMI | ST depression or T-wave inversion | Raised | Aspirin + anticoagulant; risk-stratify for angiography timing (GRACE score) |
| Unstable Angina | ST depression or normal | Normal | Aspirin + anticoagulant; early angiography if high risk |
- Anterior MI (LAD): ST changes in V1–V4
- Inferior MI (RCA): ST changes in II, III, aVF — get right-sided leads to exclude RV infarct
- Lateral MI (LCx): ST changes in I, aVL, V5–V6
- Posterior MI: Tall R waves and ST depression in V1–V2 (mirror image)
Heart Failure
Heart failure questions appear in almost every NRE attempt and test both recognition and long-term management. Know the difference between HFrEF and HFpEF, and the drug evidence for each.
| Feature | Left Heart Failure | Right Heart Failure |
|---|---|---|
| Symptoms | Dyspnoea, orthopnoea, PND, pink frothy sputum | Peripheral oedema, ascites, raised JVP, hepatomegaly |
| Classic CXR | Cardiomegaly, upper lobe diversion, Kerley B lines, pleural effusion | Cardiomegaly; right-sided pleural effusion |
| Key Investigation | Echocardiogram (EF <40% = HFrEF) | Echo, BNP level |
| Drug Treatment | ACE inhibitor + beta-blocker + spironolactone + loop diuretic for symptom relief | Treat the cause; diuretics for oedema |
Hypertension
Hypertension is tested both as a standalone condition and as part of multi-system questions. The NRE focuses on drug choice for specific patient types, target organ damage recognition, and hypertensive emergencies.
| Patient Type | Preferred First-Line Drug | Why |
|---|---|---|
| Young patient, no comorbidities | ACE inhibitor or ARB | Renin-angiotensin system dominates in young patients |
| Elderly, isolated systolic HTN | CCB (amlodipine) or thiazide | Low renin state; CCB and thiazides more effective |
| HTN + diabetes | ACE inhibitor / ARB | Renal protection — reduces proteinuria |
| HTN + heart failure | ACE inhibitor + beta-blocker + spironolactone | Mortality benefit in HFrEF |
| HTN + angina | Beta-blocker or CCB | Dual benefit on BP and myocardial oxygen demand |
| HTN in pregnancy | Methyldopa or labetalol | ACE inhibitors and ARBs are teratogenic |
| Hypertensive emergency (end-organ damage) | IV labetalol or IV nitroprusside | Controlled BP reduction over hours — not rapid |
Arrhythmias
ECG interpretation in the context of arrhythmia management is one of the most consistently tested NRE skills. You do not need to interpret every complex arrhythmia — you need to identify the common ones and know the first management step.
Atrial Fibrillation (AF)
Irregularly irregular pulse, absent P waves. Rate control (beta-blocker/digoxin) vs rhythm control (cardioversion). Anticoagulate if CHADS₂-VASc ≥2. CHA₂DS₂-VASc score is tested.
SVT
Narrow complex tachycardia. Vagal manoeuvres first. IV adenosine if vagal fails — warn patient of transient chest tightness. Contraindicated in asthma.
VT / VF
Wide complex tachycardia, haemodynamically unstable → immediate DC cardioversion. Pulseless VT/VF → defibrillation + CPR. IV amiodarone for recurrent VT.
Complete Heart Block
P waves and QRS complexes march independently. Bradycardia, syncope, cannon A waves in JVP. Emergency pacemaker insertion.
2. Respiratory Medicine — The Second Pillar
Respiratory medicine is the second most tested area of internal medicine in NRE Step 1. Questions focus on distinguishing similar-presenting conditions, understanding investigation findings, and applying guideline-based management. The overlap between respiratory pharmacology and this section is significant — know the drugs as part of disease management, not separately.
Asthma vs COPD — The NRE Always Tests This Distinction
| Feature | Asthma | COPD |
|---|---|---|
| Age at onset | Often childhood/young adult | Usually >40 years |
| Smoking history | Not required | Almost always present |
| Variability | Episodic, reversible | Progressive, partially reversible |
| Triggers | Allergens, cold air, exercise, ASA | Infections, cold air |
| Spirometry | FEV₁/FVC <0.7 (reversible with bronchodilator) | FEV₁/FVC <0.7 (not fully reversible) |
| First-line treatment | SABA + inhaled corticosteroid (persistent) | LAMA (tiotropium) ± LABA |
| Oxygen in acute attack | High-flow to maintain SpO₂ >94% | Controlled 24–28% — risk of hypercapnic drive suppression |
Pneumonia
Pneumonia questions test both diagnosis (which organism, which patient) and antibiotic choice. Know the community vs hospital distinction and the clinical features that point to atypical organisms.
| Type | Common Organisms | Clinical Clue | First-Line Antibiotic |
|---|---|---|---|
| Community-acquired (typical) | Streptococcus pneumoniae | Sudden onset, lobar consolidation, productive cough | Amoxicillin (oral) or IV co-amoxiclav if moderate |
| Atypical pneumonia | Mycoplasma, Legionella, Chlamydia | Gradual onset, dry cough, extrapulmonary features (hyponatraemia in Legionella, cold agglutinins in Mycoplasma) | Macrolide (azithromycin) or doxycycline |
| Hospital-acquired | Gram-negative rods, MRSA, Pseudomonas | Onset >48 hrs after admission | Piperacillin-tazobactam ± vancomycin |
| Aspiration | Anaerobes, gram-negatives | Risk factors: alcoholism, stroke, impaired swallow, lying on right side | Co-amoxiclav or metronidazole + cephalosporin |
| PCP (Pneumocystis) | P. jirovecii | HIV patient, low CD4, bilateral interstitial infiltrates, LDH raised | High-dose co-trimoxazole |
Pleural Effusion — Transudate vs Exudate
This distinction appears directly in NRE MCQs. Light’s criteria is the key framework.
| Transudate | Exudate | |
|---|---|---|
| Causes | Heart failure, liver cirrhosis, nephrotic syndrome, hypothyroidism | Pneumonia (parapneumonic), malignancy, TB, PE, autoimmune |
| Protein | <30 g/L | >30 g/L |
| Light’s criteria (exudate) | Pleural/serum protein >0.5 OR pleural/serum LDH >0.6 OR pleural LDH >⅔ upper normal serum LDH | |
| Glucose | Normal | Low in empyema, TB, RA, malignancy |
Pulmonary Embolism (PE)
PE is consistently tested because it presents like other conditions (MI, pneumonia, pneumothorax) and requires specific thinking to diagnose and treat.
- Classic triad: dyspnoea, chest pain, haemoptysis (but many present atypically)
- Risk factors: immobility, surgery, malignancy, OCP, pregnancy, previous DVT/PE (Virchow’s triad)
- ECG: sinus tachycardia most common; S1Q3T3 pattern (right heart strain) — classic but uncommon
- Investigation of choice: CTPA (CT pulmonary angiography)
- D-dimer: high sensitivity, low specificity — use with pre-test probability (Wells score); a negative D-dimer rules out PE if low probability
- Treatment: anticoagulation (LMWH or DOAC); thrombolysis if haemodynamically unstable (massive PE)
Tuberculosis — Clinical Recognition & Management
TB remains a high-frequency NRE topic because of its relevance to the Pakistani patient population. Know the clinical features, the investigation approach, and the drug regimen side effects (covered in the pharmacology article).
- Constitutional symptoms: weight loss, night sweats, fever, fatigue — weeks to months duration
- Productive cough, haemoptysis, upper lobe cavitation on CXR
- Lymphadenopathy — especially cervical (scrofula)
- Investigation: sputum AFB smear + culture is gold standard; Mantoux/TST useful for latent TB; IGRA more specific than TST
- Standard regimen: 2 months RHEZ + 4 months RH (2RHEZ/4RH)
- Directly Observed Therapy (DOT) — NRE tests this as a public health question too
3. Endocrine Medicine — The Third Pillar
Endocrinology questions in NRE test the entire clinical journey: recognising a hormonal condition from its symptoms, ordering and interpreting the correct investigation, and choosing the right management. Diabetes, thyroid disease, and adrenal conditions are the three highest-yield areas.
Diabetes Mellitus — Full Spectrum
Diabetes is in every NRE attempt, across multiple question formats. You will see it as a new diagnosis, a management question, an acute complication (DKA, HHS), and as a contributing factor in other conditions (ACS, CKD, retinopathy).
| Feature | Type 1 DM | Type 2 DM |
|---|---|---|
| Onset | Usually <30 years, acute | Usually >40 years, insidious |
| Build | Usually lean | Often overweight/obese |
| Pathophysiology | Autoimmune beta-cell destruction → absolute insulin deficiency | Insulin resistance + progressive beta-cell failure |
| Ketosis | Prone to DKA | DKA uncommon; HHS more likely in severe hyperglycaemia |
| Initial treatment | Insulin (mandatory) | Lifestyle + metformin; insulin added as needed |
| Diagnostic criterion | Fasting glucose ≥7.0 mmol/L, or 2-hr glucose ≥11.1 mmol/L on OGTT, or HbA1c ≥48 mmol/mol (6.5%), or random glucose ≥11.1 + symptoms | |
DKA vs HHS — A Frequent NRE Comparison
| Feature | DKA | HHS (Hyperosmolar Hyperglycaemic State) |
|---|---|---|
| Patient | Type 1 DM (usually) | Type 2 DM (usually elderly) |
| Glucose | Usually 14–30 mmol/L | Usually >30–40 mmol/L |
| pH | <7.3 (acidosis) | Normal (>7.3) |
| Ketones | Strongly positive (urine + blood) | Absent or minimal |
| Osmolality | Elevated | Markedly elevated (>320 mOsm/kg) |
| Management | IV fluid (0.9% NaCl) → insulin infusion → potassium replacement | IV fluids primarily; insulin only when glucose not falling with fluids alone |
Thyroid Disease
| Condition | TSH | Free T4 | Clinical Features | Treatment |
|---|---|---|---|---|
| Primary hypothyroidism | ↑ High | ↓ Low | Weight gain, cold intolerance, constipation, bradycardia, hoarse voice, dry skin, depression | Levothyroxine — titrate to normalise TSH |
| Primary hyperthyroidism (Graves’) | ↓ Low | ↑ High | Weight loss, heat intolerance, palpitations, tremor, exophthalmos, pretibial myxoedema (Graves’ specific) | Carbimazole or PTU; then radioiodine or surgery |
| Secondary hypothyroidism (pituitary) | ↓ Low | ↓ Low | Same as primary but TSH also low — pituitary cause | Treat pituitary cause; levothyroxine |
| Subclinical hypothyroidism | ↑ High | Normal | Often asymptomatic; treat if TSH >10 or symptomatic | Levothyroxine (selective) |
Adrenal Conditions
Addison’s Disease
Fatigue, hypotension, hyperpigmentation, hyponatraemia, hyperkalaemia. Short synacthen test for diagnosis. Treatment: hydrocortisone + fludrocortisone. Sick day rules: double the dose during illness.
Cushing’s Syndrome
Central obesity, moon face, buffalo hump, striae, proximal myopathy, hypertension, diabetes, osteoporosis. Overnight dexamethasone suppression test for screening. High-dose dex suppresses pituitary ACTH (Cushing’s disease) but not ectopic or adrenal tumour.
Phaeochromocytoma
Paroxysmal hypertension, headache, sweating, palpitations. 24-hour urinary metanephrines or plasma metanephrines for diagnosis. Alpha-blockade (phenoxybenzamine) before surgery — never beta-block first.
Conn’s Syndrome
Hypertension + hypokalaemia + metabolic alkalosis. Raised aldosterone, suppressed renin. CT adrenal for adenoma. Spironolactone or surgery.
How to Approach Medicine MCQs in NRE Step 1
Medicine MCQs in NRE are designed to test clinical decision-making, not factual recall. Most candidates who fail do so not because they lack knowledge, but because they misread the question or skip a clinical clue. Use this sequence for every medicine MCQ:
- 1 Read the last sentence first. Know what the question is actually asking before you read the scenario. Is it asking for a diagnosis, an investigation, or a management step?
- 2 Identify the key clinical features. Age, duration of symptoms, specific findings (ECG changes, investigation values, vital signs). Every detail in a well-written MCQ is there for a reason.
- 3 Narrow to two answers before looking at options. If you can form a differential from the scenario alone, you are less likely to be confused by plausible-looking distractors.
- 4 Apply the “what would I do right now” rule. NRE management questions almost always ask for the immediate or most appropriate next step — not the ideal long-term plan. If the patient is haemodynamically unstable, stability comes before investigation.
- 5 Flag and move on. If you are genuinely unsure, eliminate the clearly wrong options, make your best choice, flag the question, and come back. Spending 4 minutes on one MCQ costs you others.
Frequently Asked Questions
How much of NRE Step 1 is internal medicine?
Are ECG interpretation questions common in NRE Step 1?
Is DKA management always tested the same way?
I am preparing from China — how different is the medicine content from my university exams?
Need a Subject-Wise Study Plan for NRE Step 1?
Tell us your graduation year, which country you studied in, and your target exam date. We will give you a personalised plan covering medicine, surgery, and all other NRE subjects.
💬 Message on WhatsApp