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Types and Common Examples of Questions in Medicine — A Comprehensive Approach

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1. Diagnosis Questions — "What does this patient have?"

Subtypes

How to Approach

1. Generate a differential — List all plausible diagnoses based on the chief complaint, organized by organ system or by life-threatening vs. common conditions (use the mnemonic: Vascular, Infective, Neoplastic, Degenerative, Inflammatory, Metabolic/Toxic, Congenital, Endocrine — VINDICE).
2. Prioritize by probability — Use epidemiology: age, sex, risk factors. A 20-year-old with sudden chest pain → pneumothorax. A 65-year-old smoker → ACS or PE.
3. Narrow using key discriminators — Identify features that are sensitive (rules out when absent — SnOUT) or specific (rules in when present — SpIN):
   • Negative feature: No fever rules out most infectious etiologies.
   • Positive feature: A friction rub makes pericarditis likely; bilateral leg edema + orthopnea pinpoints heart failure.
4. Anchor on the best-fit diagnosis — "The fundamental basis of internal medicine is that diagnosis should elucidate the pathophysiologic explanation for symptoms and signs so that therapy may improve the underlying abnormality." — Goldman-Cecil Medicine

Pitfall: Premature closure — settling on the first plausible diagnosis and failing to re-evaluate. Cognitive bias (anchoring, availability, framing) accounts for >75% of diagnostic errors. — Textbook of Family Medicine 9e

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2. Mechanism/Pathophysiology Questions — "Why does this happen?"

Examples

• "Why does mitral stenosis cause pulmonary edema?"
• "How does ACE inhibitor use cause hyperkalemia?"
• "Why is there a low-pitched diastolic murmur at the apex in mitral stenosis?"

How to Approach

1. Trace the chain of events from the primary lesion → downstream effects:
   • Mitral stenosis → ↑ left atrial pressure → ↑ pulmonary venous pressure → transudation into alveoli → pulmonary edema
2. Use physiological principles (Frank-Starling, Ohm's law for circulation, Henderson-Hasselbalch for acid-base).
3. Connect anatomy to function — Know what structure does what, and what happens if it fails.
4. State the compensatory mechanisms — The body always tries to compensate; recognizing this explains clinical findings (e.g., tachycardia in hypovolemia).

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3. Investigation/Workup Questions — "What tests should I order?"

Examples

• "What is the first investigation for suspected pulmonary embolism?"
• "Which test confirms a diagnosis of hypothyroidism?"
• "What investigations are needed for new-onset hypertension?"

How to Approach

1. Sensitivity and specificity — Match the test to the clinical stage (screening vs. confirmation)
2. Pre-test probability — Bayes' theorem: a test is most useful when pre-test probability is intermediate (~30–70%)
3. Risk–benefit — Invasive tests only when necessary (e.g., biopsy after non-invasive tests are inconclusive)
4. Sequence logically — Non-invasive → Invasive; Cheap → Expensive; General → Specific
5. Interpret in context — A normal ECG does not exclude ACS; a mildly elevated TSH in a sick patient may be non-thyroidal illness

Classic sequence example — chest pain: ECG → Troponin (serial) → Echo → CT coronary angiography → Coronary angiography

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4. Treatment/Management Questions — "How do I treat this patient?"

Subtypes

How to Approach

1. Airway → Breathing → Circulation → Disability (neuro)
2. Treat life-threatening conditions before establishing definitive diagnosis

1. Non-pharmacological first (lifestyle, diet, physiotherapy)
2. Pharmacological — First-line → Second-line → Add-on therapy
3. Interventional/surgical — when medications fail or complications arise
4. Monitoring — define endpoints, review intervals, surveillance for complications

Evidence-based caveat: Guidelines provide a framework; "substantial clinical judgment is required to determine whether the evidence applies to individual patients and to recognize the occasional exceptions." — Goldman-Cecil Medicine

Patient context matters: A treatment plan acceptable in guidelines may not suit the patient's values, comorbidities, or social circumstances. Always tailor the plan.

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5. Interpretation Questions — "What does this result mean?"

Subtypes

How to Approach

• ECG: Rate → Rhythm → P-wave morphology → PR interval → QRS duration → ST/T changes → QTc
• ABG: pH (acidosis/alkalosis) → Primary disorder (metabolic vs. respiratory) → Compensation (expected vs. actual) → Anion gap → Delta-delta ratio if needed
• CXR: Airways → Bones → Cardiac silhouette → Diaphragm → Effusions → Fields (parenchyma) → Great vessels → Hila — "A-B-C-D-E-F-G-H" approach
• Histopathology: Identify architecture, cell types, special features (necrosis, granulomas, inclusions)

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6. Prognosis Questions — "What will happen to this patient?"

Examples

• "What is the 5-year survival of Stage III lung cancer?"
• "What is the CHILD-PUGH score used for?"
• "What complications are expected in poorly controlled diabetes?"

How to Approach

1. Know validated prognostic scoring systems (APACHE II, Child-Pugh, Wells score, CURB-65, etc.)
2. State short-term vs. long-term outcomes separately
3. Identify modifiable factors that change prognosis (treatment adherence, risk factor control)
4. Communicate uncertainty honestly — prognosis is probabilistic, not deterministic

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7. Pharmacology Questions — "How does this drug work? / What are its side effects?"

Subtypes

How to Approach

1. MOA → Link to receptor/enzyme → Explain downstream physiological effect
2. Side effects → Derive from MOA (on-target) + off-target toxicity
3. Interactions → Pharmacokinetic (absorption, metabolism via CYP450, excretion) vs. pharmacodynamic (additive, synergistic, antagonistic)
4. Contraindications → Based on harm in specific physiological states (pregnancy, renal failure, liver disease)

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8. Ethics and Communication Questions — "What should you do in this situation?"

Examples

• "A competent patient refuses a life-saving blood transfusion — what do you do?"
• "How do you break bad news?"
• "A patient asks you to keep their diagnosis from their spouse — how do you respond?"

How to Approach — SPIKES Protocol (for breaking bad news)

1. Autonomy — respect patient decision-making capacity
2. Beneficence — act in the patient's best interest
3. Non-maleficence — avoid harm
4. Justice — fair allocation of resources

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9. Prevention / Screening Questions — "How do we prevent this disease?"

Examples

• "Who should be screened for colorectal cancer?"
• "What vaccinations are recommended for a 65-year-old immunocompromised patient?"
• "What are the primary prevention strategies for cardiovascular disease?"

How to Approach

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10. "Next Best Step" Questions — Common in Exams

Examples

• "A 3-year-old swallows a button battery — what is the next best step?"
• "A patient on heparin develops a platelet count of 50,000 — what do you do next?"
• "Results of the test are back. What do you do next?"

How to Approach

1. Assess urgency first — Is there an immediate threat to life?
2. Follow the logical sequence — Don't jump to treatment before confirming diagnosis, unless unstable
3. Avoid distractors — The answer is the most appropriate next step, not the eventual definitive management
4. Ask: "Is the patient stable or unstable?" → Unstable patients always get supportive care first

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Universal Framework for Any Medical Question

1. WHO is the patient? (Age, sex, comorbidities, context)
2. WHAT is the problem? (Symptom, sign, abnormal result)
3. WHERE is the lesion? (Organ/system localization)
4. WHY did this happen? (Etiology — structural, infectious, metabolic, genetic...)
5. HOW bad is it? (Severity, staging, acuity)
6. WHAT do we do? (Investigate → Treat → Monitor)
7. WHAT will happen? (Prognosis, complications, follow-up)

"The patient-physician interaction proceeds through many phases of clinical reasoning and decision making... beginning with an elucidation of complaints, followed by inquiries in increasingly precise ways." — Goldman-Cecil Medicine

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Common Pitfalls to Avoid

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🫁 PAPER ONE — RESPIRATORY MEDICINE

Answered Internal Medicine Examination Paper

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SECTION A — SHORT ANSWER QUESTIONS (SAQs)

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Q1. A 58-year-old male smoker presents with a 6-month history of progressive exertional dyspnea, chronic productive cough, and occasional wheeze. Spirometry shows FEV₁/FVC < 0.70 and FEV₁ 45% predicted. ABG shows pH 7.36, PaCO₂ 52 mmHg, PaO₂ 58 mmHg, HCO₃⁻ 30 mEq/L.

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✅ MODEL ANSWER — Q1

(a) Diagnosis & GOLD Stage

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(b) ABG Interpretation — Systematic Approach

HCO₃⁻ rises by 3.5 mEq/L for every 10 mmHg rise in PaCO₂ ΔPaCO₂ = 52 − 40 = 12 mmHg → Expected ΔHCO₃⁻ = 12 × 3.5/10 = 4.2 mEq/L Expected HCO₃⁻ = 24 + 4.2 = 28.2 mEq/L (observed = 30 → appropriate compensation)

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(c) Pharmacological Management of GOLD 3 COPD

• LABA (Long-Acting Beta-2 Agonist): e.g., salmeterol, formoterol — relaxes bronchial smooth muscle via β₂-receptor activation → reduces dynamic hyperinflation
• LAMA (Long-Acting Muscarinic Antagonist): e.g., tiotropium — blocks M3 receptors → reduces airway tone and secretions
• At GOLD 3: LABA + LAMA combination is preferred over either alone

• Added if frequent exacerbations (≥2/year) or eosinophil count ≥300 cells/µL
• e.g., LABA + ICS (fluticasone/salmeterol) or LABA + LAMA + ICS triple therapy

• Roflumilast — for GOLD 3–4 with chronic bronchitis phenotype and frequent exacerbations
• Reduces intracellular cAMP breakdown → anti-inflammatory

• Theophylline — weak bronchodilator, narrow therapeutic window; reserve for those unable to use inhalers

• Indicated when resting PaO₂ ≤ 55 mmHg (or ≤60 mmHg with cor pulmonale/polycythaemia)
• This patient's PaO₂ = 58 → borderline; assess for cor pulmonale

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(d) Pathophysiology of Dyspnea in COPD

• Increased airway resistance (from airway wall inflammation and mucus) → ↑ work of breathing
• Reduced lung elastic recoil (emphysema) → air trapping → static lung hyperinflation

• During exercise, increased ventilatory demand + insufficient expiratory time → end-expiratory lung volume (EELV) fails to return to baseline
• This reduces inspiratory reserve volume (IRV) and impairs the ability to increase tidal volume
• A critical disparity arises between respiratory muscle effort and actual tidal volume change — termed neuromechanical uncoupling — the dominant subjective sensation of dyspnea

• V/Q mismatch → elevated dead space fraction → increased ventilatory requirement for any given CO₂ production

"Dynamic hyperinflation causes a critical reduction in inspiratory reserve volume, inspiratory muscle weakness, and increased work of breathing. A substantial disparity arises between respiratory muscle effort and the resultant VT response — neuromechanical uncoupling." — Fishman's Pulmonary Diseases and Disorders

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SECTION B — EXTENDED MATCHING QUESTION (EMQ)

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Q2. For each of the following clinical scenarios, select the most appropriate next investigation:

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✅ MODEL ANSWERS — Q2

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SECTION C — STRUCTURED CLINICAL SCENARIO (SBA/MEQ hybrid)

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Q3. A 68-year-old woman with no prior cardiac history presents with sudden-onset dyspnea, right-sided pleuritic chest pain, and haemoptysis. She returned 5 days ago from a 14-hour flight. HR 118/min, BP 100/70 mmHg, SpO₂ 88% on air. ECG shows sinus tachycardia + S1Q3T3 pattern.

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✅ MODEL ANSWER — Q3

(a) Diagnosis + Supporting Features

1. Provoked VTE risk: Prolonged immobilisation (14-hour flight) → venous stasis (Virchow's triad)
2. Clinical triad of PE: Pleuritic chest pain + haemoptysis + dyspnea
3. Haemodynamic compromise: BP 100/70 + SpO₂ 88% → massive/submassive PE
4. ECG: S1Q3T3 = right heart strain pattern (S wave in lead I, Q wave + T-wave inversion in lead III)

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(b) Wells Score Calculation

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(c) Immediate Management

• Supplemental oxygen → target SpO₂ > 94%
• Consider non-invasive ventilation if severe hypoxia

• Unfractionated heparin (UFH) IV bolus 80 units/kg → infusion at 18 units/kg/hr (preferred in massive PE — reversible, can bridge to thrombolysis)
• Alternatively LMWH (enoxaparin 1 mg/kg SC BD) if haemodynamically stable

• Systemic thrombolysis: Alteplase 100 mg IV over 2 hours — if no contraindication (e.g., no recent surgery, no active bleeding)
• Catheter-directed thrombolysis or surgical embolectomy if thrombolysis contraindicated

• ICU admission, continuous cardiac monitoring, repeat echocardiography for RV function

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(d) Biomarker of High Short-Term Mortality

"Patients with acute PE who have elevated levels of troponin are at high risk for short-term mortality and adverse outcome events." — Murray & Nadel's Textbook of Respiratory Medicine

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(e) Long-term Anticoagulation Options

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🫀 PAPER TWO — CARDIOVASCULAR MEDICINE

Answered Internal Medicine Examination Paper

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SECTION A — SHORT ANSWER QUESTIONS

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Q1. A 62-year-old hypertensive diabetic male presents to the ED at 11 PM with central crushing chest pain radiating to the left jaw, diaphoresis, and nausea for 90 minutes. His ECG shows 3 mm ST elevation in leads II, III, aVF with reciprocal ST depression in I and aVL. BP 90/60 mmHg. Troponin I = 8.2 ng/mL (reference < 0.04 ng/mL).

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✅ MODEL ANSWER — Q1

(a) Diagnosis + Culprit Artery

• ST elevation in II, III, aVF → Inferior wall → supplied by the Right Coronary Artery (RCA) in ~80% of individuals (right-dominant circulation)
• Reciprocal ST depression in I and aVL confirms inferior STEMI and excludes lateral involvement

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(b) Troponin Interpretation and Kinetics

• This patient is 90 minutes into symptoms — the troponin has already risen significantly, suggesting either a large infarct or earlier onset than stated
• cTnI is cardiac-specific (unlike myoglobin which cannot distinguish cardiac from skeletal muscle)
• Serial troponins at 0 and 3 hours (high-sensitivity assay) or 0 and 6 hours (conventional assay) confirm dynamic rise/fall pattern

"In AMI, cardiac TnI becomes elevated 4–8 hours after onset of chest pain, reaches a peak at about 12–16 hours, and remains elevated for 5–9 days. Values at or above 1.5 ng/mL are considered suggestive of AMI." — Henry's Clinical Diagnosis and Management by Laboratory Methods

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(c) Immediate Management — "MONA + Reperfusion + Antiplatelet + Anticoagulant"

• IV access × 2, continuous cardiac monitoring, 12-lead ECG, bloods (FBC, U&E, glucose, lipids, coagulation)
• Cardiac monitor + defibrillator ready

• Target: Primary PCI within 90 minutes of first medical contact — preferred when available
• "Primary PCI is the preferred reperfusion strategy when available within 90 minutes of first medical contact. Compared to fibrinolytic therapy, PCI offers superior vessel patency with less reinfarction, less risk of intracranial hemorrhage, and improved survival." — Washington Manual of Medical Therapeutics
• If PCI not available within 120 minutes → fibrinolysis (alteplase or tenecteplase)

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(d) Haemodynamic Instability + Reperfusion

"Patients who present with severe HF or cardiogenic shock should receive primary PCI." — Washington Manual of Medical Therapeutics

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SECTION B — EXTENDED MATCHING QUESTION (EMQ)

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Q2. Theme: Heart Failure — Match the description to the most appropriate pharmacological agent:

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✅ MODEL ANSWERS — Q2

"A rise in angiotensin II promotes cardiac myocyte programmed cell death, hypertrophy, and ventricular fibrosis." — Textbook of Family Medicine 9e

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SECTION C — "NEXT BEST STEP" SCENARIO

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Q3. A 55-year-old woman with known HFrEF (EF 25%) on optimal therapy presents with 3 days of worsening dyspnea, orthopnea, and leg swelling. She is alert, BP 100/70 mmHg, HR 105/min (sinus), SpO₂ 90% on air, bilateral crackles to the mid-zones, JVP elevated 6 cm above the sternal angle, S3 gallop.

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✅ MODEL ANSWER — Q3

(a) Clinical State + Forrester Classification

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(b) Immediate Management Priorities

1. Oxygen — supplemental O₂ via face mask; consider CPAP/BiPAP for severe pulmonary oedema (reduces work of breathing, reduces preload by ↑ intrathoracic pressure)
2. IV Loop Diuretic — Furosemide 40–80 mg IV stat → rapid venodilation (immediate, before diuresis begins) → then sustained diuresis; monitor urine output hourly
3. IV Vasodilator (if BP allows > 100 mmHg systolic) — GTN infusion → reduces preload and afterload; reduce pulmonary venous pressure
4. Inotrope — Given hypoperfusion: Dobutamine (β1 agonist) IV infusion → improves cardiac output; avoid in ischaemic aetiology without monitoring; consider if refractory
5. Monitor and Reassess: Hourly urine output, repeat ECG, continuous SpO₂, creatinine + electrolytes at 6 hours (furosemide can cause hypokalaemia → arrhythmia risk in HF)

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(c) Mechanism of S3 Gallop

• LV is dilated and poorly compliant (reduced EF)
• The rapid inflow of blood in early diastole creates abnormal wall tension and vibration
• S3 = marker of elevated LV filling pressures and volume overload → poor prognostic sign in adults

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(d) BNP 1800 pg/mL — Interpretation

1. Markedly elevated LV filling pressures — severe volume/pressure overload
2. Poor short-term prognosis — higher risk of in-hospital mortality and 30-day readmission
3. Response monitoring: Serial BNP-guided therapy — a ≥30% reduction in BNP during admission is associated with improved outcomes

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📐 The 7-Question Universal Strategy — Applied to Every Answer Above

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