600 Level Medicine · Student Exam Prep Guide
Read Faculty Briefing ReportRespiratory Medicine: Student Exam Prep Guide
The comprehensive pre-exam study guide: 5-day structured plan, high-yield clinical summaries, diagnostic clue recognition, and 10 practice MCQs with model answers.
1. 5-Day Countdown Study Plan
| Day | Targeted Revision Modules & Daily Goal |
|---|---|
| Day 1 | COPD phenotypes & LTOT criteria, Asthma stepwise ICS management, and practice 10 ABG tracings. |
| Day 2 | Pneumonia (CURB-65 calculation), Pulmonary Embolism (Wells criteria & CTPA), Lung cancer, and Pleural effusion (Light's criteria). |
| Day 3 | Tuberculosis (HRZE adverse effects, miliary pattern), Suppurative lung diseases, Malaria life cycle/treatment, and the 4 HIV complication groups. |
| Day 4 | Spirometry flow-volume curves, medical devices & biopsy needles, emergency protocols (acute severe asthma, COPD exacerbation). |
| Day 5 | Work through the 10 practice MCQs and 3 clinical scenarios below. Revisit any missed items. |
| Eve of Exam | Review the quick-recall summary tables and final checklist. Pack clinical tools and sleep early. |
2. High-Yield Clinical Summaries
2.1 CURB-65 Severity Score for Pneumonia
| Letter | Clinical Criterion | Points & Clinical Management Threshold |
|---|---|---|
| C | Confusion | 1 point if new mental confusion (AMTS ≤8). |
| U | Urea | 1 point if serum urea >7.0 mmol/L. |
| R | Respiratory Rate | 1 point if respiratory rate ≥30 breaths/min. |
| B | Blood Pressure | 1 point if SBP <90 mmHg OR DBP ≤60 mmHg. |
| 65 | Age ≥65 Years | 1 point if aged 65 years or older. |
| Interpretation: Score 0–1 = Low risk (home treatment); Score 2 = Moderate risk (hospital admission); Score ≥3 = High risk / severe (urgent ICU assessment). | ||
2.2 Bronchogenic Carcinoma Classifications
| Histological Type | Location | Hallmark Features & Paraneoplastic Syndromes |
|---|---|---|
| Squamous Cell Carcinoma | Central | Cavitation on chest X-ray; Hypercalcaemia (PTHrP secretion). |
| Adenocarcinoma | Peripheral | Most common type in non-smokers and females; targetable driver mutations (EGFR, ALK). |
| Small Cell Lung Cancer | Central | Highly aggressive neuroendocrine; SIADH (hyponatraemia), ectopic ACTH (Cushingoid), Lambert-Eaton myasthenic syndrome. |
| Large Cell Carcinoma | Peripheral | Rapidly growing bulky peripheral masses with early metastases. |
2.3 The 5-Step Systematic ABG Interpretation Protocol
| Step | Parameter | Normal Value & Diagnostic Question |
|---|---|---|
| Step 1 | pH | 7.35–7.45: Acidosis (<7.35), Alkalosis (>7.45), or Normal? |
| Step 2 | PaCO2 | 35–45 mmHg: High PaCO2 causes respiratory acidosis; Low PaCO2 causes respiratory alkalosis. |
| Step 3 | HCO3- | 22–26 mmol/L: Low HCO3- indicates metabolic acidosis; High HCO3- indicates metabolic alkalosis. |
| Step 4 | Compensation | Has the secondary system shifted towards restoring normal pH? (Uncompensated, partially compensated, fully compensated). |
| Step 5 | PaO2 & PaCO2 | PaO2 80–100 mmHg: Type 1 failure (hypoxemia with normal/low PaCO2); Type 2 failure (hypoxemia with hypercapnia PaCO2 >45). |
3. Written Exam High-Yield Tables
3.1 First-Line Antitubercular Therapy (2HRZE / 4HR)
| Medication | Key Adverse Effects & Clinical Management |
|---|---|
| Isoniazid (H) | Peripheral neuropathy (co-prescribe Pyridoxine / Vitamin B6), drug-induced hepatitis, SLE-like syndrome. |
| Rifampicin (R) | Orange-red discoloration of body fluids, hepatitis, potent CYP450 inducer (major drug-drug interactions with ARVs). |
| Pyrazinamide (Z) | Hepatotoxicity, hyperuricemia (arthralgias / precipitation of acute gout). |
| Ethambutol (E) | Retrobulbar optic neuritis (loss of red-green color vision, decreased visual acuity); baseline ophthalmological test required. |
3.2 Suppurative Lung Disease: Abscess vs. Bronchiectasis
| Clinical Feature | Lung Abscess | Bronchiectasis |
|---|---|---|
| Typical Patient | Alcoholic, poor dentition, seizure disorder, aspiration risk | History of severe childhood measles/whooping cough, CF, TB sequela |
| Sputum Character | Foul-smelling, putrid, purulent sputum | Copious three-layered sputum, worst in the morning on waking |
| Diagnostic Radiograph | CXR: Thick-walled cavity with classic horizontal air-fluid level | HRCT: Signet ring sign (internal diameter of bronchus > accompanying pulmonary artery) |
| Treatment | Prolonged antibiotics (4–6 weeks covering anaerobes), postural drainage | Daily chest physiotherapy, postural drainage, prompt antibiotics for acute infective exacerbations |
4. OSCE Station: Spirometry Tracings Comparison
| Spirometry Feature | Obstructive Pattern (e.g. Asthma, COPD) | Restrictive Pattern (e.g. ILD, Kyphoscoliosis) |
|---|---|---|
| Volume-Time Curve | Slow prolonged rise to plateau; prolonged expiration >6 seconds | Steep rapid rise reaching a plateau quickly, but total volume (FVC) is markedly reduced |
| Flow-Volume Loop | Scooped-out, concave expiratory descending limb | Miniature / shrunk version of normal curve; linear straight-sloping descending limb |
| FEV1 / FVC Ratio | Reduced (<70% / <0.70) | Normal or Elevated (≥70%) |
5. 10 Practice Examination MCQs with Rationale
1. Which medication represents the foundational component present across every step of modern asthma management?
A. SABA aloneB. Inhaled Corticosteroid (ICS)C. Oral theophyllineD. Antihistamine
Correct Answer: B. Inhaled Corticosteroid (ICS)
ICS is mandatory at every step of asthma therapy; SABA monotherapy is no longer recommended.
2. The gold standard investigation for confirming a diagnosis of COPD is:
A. Plain Chest RadiographB. Post-bronchodilator SpirometryC. Sputum microbiological cultureD. High-resolution CT scan
Correct Answer: B. Post-bronchodilator Spirometry
An FEV1/FVC ratio <0.70 confirms persistent airflow limitation.
3. Classically, panacinar emphysema is associated with:
A. Heavy tobacco smokingB. Alpha-1 Antitrypsin DeficiencyC. Coal worker's pneumoconiosisD. Silicosis
Correct Answer: B. Alpha-1 Antitrypsin Deficiency
Centriacinar involves upper zones in smokers; panacinar involves lower zones in AAT deficiency.
4. A patient with massive Pulmonary Embolism presents with systolic BP of 82/50 mmHg. The treatment of choice is:
A. Low-dose oral aspirinB. Immediate systemic ThrombolysisC. High-dose oral loop diureticsD. Compression stockings only
Correct Answer: B. Immediate systemic Thrombolysis
Haemodynamic compromise (SBP <90 mmHg) warrants emergency thrombolytic therapy.
5. The gold standard diagnostic investigation for suspected pulmonary embolism in a stable patient is:
A. CT Pulmonary Angiography (CTPA)B. Transthoracic echocardiogramC. Arterial blood gasD. Peak expiratory flow rate
Correct Answer: A. CT Pulmonary Angiography (CTPA)
CTPA provides definitive direct visualization of the pulmonary arterial filling defects.
6. A 72-year-old confused man has serum urea of 10.2 mmol/L, RR of 34/min, and BP 84/52 mmHg. His CURB-65 score is:
A. 2B. 3C. 4D. 5
Correct Answer: D. 5
Confusion (1), Urea >7 (1), RR >=30 (1), BP SBP<90 (1), Age >=65 (1) = 5 points.
7. An arterial blood gas reveals: pH 7.28, PaCO2 62 mmHg, HCO3- 25 mmol/L. This is interpreted as:
A. Fully compensated metabolic acidosisB. Uncompensated respiratory acidosisC. Respiratory alkalosisD. Mixed metabolic alkalosis
Correct Answer: B. Uncompensated respiratory acidosis
Acidemic pH with elevated PaCO2 and normal HCO3- defines acute uncompensated respiratory acidosis.
8. Which histological subtype of bronchogenic carcinoma typically presents peripherally in non-smokers?
A. Squamous cell carcinomaB. Small cell carcinomaC. AdenocarcinomaD. Bronchial carcinoid
Correct Answer: C. Adenocarcinoma
Adenocarcinoma arises peripherally in mucous glands and is the most common form in non-smokers.
9. On a flow-volume loop, a scooped-out (concave) expiratory limb is characteristic of:
A. Restrictive ventilatory defectB. Obstructive ventilatory defectC. Normal athletic pulmonary physiologyD. Upper airway fixed extrathoracic stenosis
Correct Answer: B. Obstructive ventilatory defect
Diminished expiratory flow rates due to airway resistance cause the scooped-out concavity.
10. In respiratory procedural clinical practice, Abraham's needle is indicated for:
A. Closed pleural biopsyB. Bone marrow trephine aspirationC. Percutaneous liver biopsyD. Lumbar subarachnoid puncture
Correct Answer: A. Closed pleural biopsy
Abraham's needle is specially designed to obtain parietal pleural tissue specimens.
6. High-Yield Exam Night Checklist
Calculate CURB-65 quickly from clinical values
Know Wells criteria & CTPA indications for PE
Apply the 5-step ABG interpretation algorithm
Recite 2HRZE / 4HR regimen & side effects cold