Pulmonology Practice Questions

Q: What is the initial treatment for pulmonary embolism?

Anticoagulation. **Explanation:** The primary goal in managing Pulmonary Embolism (PE) is to prevent further clot propagation and recurrent embolism while the body’s endogenous fibrinolytic system dissolves the existing clot. **1. Why Anticoagulation is Correct:** Anticoagulation is the **initial treatment of choice** for hemodynamically stable patients [2]. It should be started immediately upon clinical suspicion, even before confirmatory imaging (unless contraindicated). Common agents include Low Molecular Weight Heparin (LMWH), Fondaparinux, or Unfractionated Heparin (UFH) [2]. It halts the coagulation cascade, allowing the thrombus to stabilize and eventually resolve. **2. Why Other Options are Incorrect:** * **Fibrinolysis (Thrombolysis):** Reserved for **Massive PE** (hemodynamically unstable patients with systolic BP <90 mmHg) or select cases of Submassive PE with evidence of right ventricular strain [1]. It carries a high risk of major bleeding. * **Surgical Embolectomy:** A rescue therapy used only when fibrinolysis is contraindicated or has failed in critically ill patients [1]. * **Venacaval (IVC) Filter:** Indicated only when there is an **absolute contraindication to anticoagulation** or if there is recurrent PE despite adequate therapeutic anticoagulation. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA) [1]. * **Best Initial Test:** Chest X-ray (usually normal, but helps rule out other causes). * **ECG Finding:** Most common is Sinus Tachycardia; most specific is **S1Q3T3** (deep S in lead I, Q wave and inverted T in lead III). * **Drug of Choice in Pregnancy:** LMWH (does not cross the placenta). * **Wells’ Score:** Used to determine the pre-test probability of PE [2].

Q: All of the following are causes of hemorrhagic pleural effusion except?

Rheumatoid arthritis. **Explanation:** A **hemorrhagic pleural effusion** is defined by a pleural fluid appearance that is blood-tinged, typically with a Red Blood Cell (RBC) count >10,000/mm³. It is distinct from a hemothorax (where the pleural fluid hematocrit is >50% of the peripheral hematocrit). **Why Rheumatoid Arthritis (RA) is the correct answer:** Pleural effusion in RA is typically a **pseudochylothorax** or a chronic exudate [2]. Characteristically, RA effusions have **very low glucose levels** (<30 mg/dL), low pH, and high LDH [1]. The fluid is usually turbid or milky due to high cholesterol levels, but it is **not** typically hemorrhagic. **Analysis of incorrect options (Causes of Hemorrhagic Effusion):** * **Pulmonary Embolism (PE):** This is a common cause of hemorrhagic effusion due to pleural ischemia and increased capillary permeability following pulmonary infarction [1], [3]. * **Tuberculosis (TB):** While TB usually presents as a straw-colored exudate, it can be hemorrhagic in acute or severe cases due to the rupture of subpleural caseous foci. * **Pancreatitis:** Acute pancreatitis can cause a left-sided hemorrhagic effusion with high amylase levels due to the tracking of pancreatic enzymes through the diaphragm. **NEET-PG High-Yield Pearls:** 1. **Most common cause of hemorrhagic effusion:** Malignancy (especially Lung and Breast cancer) [1]. 2. **Differential for Low Glucose in Pleural Fluid:** RA (lowest), Empyema, Malignancy, and TB. 3. **Pancreatitis Effusion:** Characterized by very high **Amylase** levels (higher than serum levels). 4. **RA Effusion marker:** Low Complement levels (C3, C4) in the pleural fluid are often seen.

Q: A 25-year-old man presented to the emergency medicine department with acute onset sharp pain and dyspnea. His chest X-ray is provided. What is the diagnosis?

Spontaneous pneumothorax. ***Spontaneous pneumothorax*** - Acute onset **sharp pleuritic chest pain** and **dyspnea** in a young male is classic for spontaneous pneumothorax, especially in tall, thin individuals. - Chest X-ray would show a **visible pleural line** with absent **peripheral lung markings** on the affected side, indicating collapsed lung. *Pleural effusion* - Typically presents with **gradual onset dyspnea** and dull chest pain, not acute sharp pain. - Chest X-ray shows **blunting of costophrenic angles** and **fluid levels**, not the air-filled pleural space seen in pneumothorax. *Pulmonary embolism* - Often presents with **sudden dyspnea** and chest pain, but chest X-ray is usually **normal** or shows non-specific changes. - Associated with **risk factors** like prolonged immobilization, surgery, or hypercoagulable states, not typically seen in healthy young males. *Hydropneumothorax* - Represents presence of both **air and fluid** in the pleural space, typically following trauma or infection. - Chest X-ray would show **air-fluid level** in the pleural space, which is distinct from simple pneumothorax findings.

Q: A patient on spirometry shows FEV1/FVC =30% but <50% predicted. What is the patient's diagnosis according to GOLD criteria?

Severe COPD. ### Explanation The classification of Chronic Obstructive Pulmonary Disease (COPD) severity is based on the **GOLD (Global Initiative for Chronic Obstructive Lung Disease) criteria**. To diagnose COPD, the post-bronchodilator **FEV1/FVC ratio must be < 0.70** [1]. Once this obstruction is confirmed, the severity is graded based on the **FEV1 % predicted** value [1]. **Why "Severe COPD" is correct:** According to the GOLD staging [1]: * **GOLD 1 (Mild):** FEV1 ≥ 80% predicted * **GOLD 2 (Moderate):** 50% ≤ FEV1 < 80% predicted * **GOLD 3 (Severe):** 30% ≤ FEV1 < 50% predicted * **GOLD 4 (Very Severe):** FEV1 < 30% predicted Since the patient’s FEV1 is between 30% and 50%, they fall squarely into the **GOLD 3: Severe COPD** category. **Analysis of Incorrect Options:** * **Mild COPD:** Requires FEV1 ≥ 80%. * **Moderate COPD:** Requires FEV1 between 50% and 79%. * **Very Severe COPD:** Requires FEV1 to drop below 30% (or < 50% with chronic respiratory failure). **High-Yield Clinical Pearls for NEET-PG:** 1. **Diagnosis:** A post-bronchodilator FEV1/FVC < 0.7 is the **gold standard** for diagnosing persistent airflow limitation [1]. 2. **ABCD Assessment:** While GOLD grades (1-4) measure airflow limitation, the **ABCD (or ABE) assessment** tool is used to guide treatment based on symptoms (mMRC/CAT scores) and exacerbation history. 3. **Management:** Long-acting bronchodilators (LAMA/LABA) are the mainstay of treatment [1]. Inhaled Corticosteroids (ICS) are typically reserved for patients with high blood eosinophil counts or frequent exacerbations. 4. **Mortality:** The only interventions proven to prolong survival in COPD are **smoking cessation** and **long-term oxygen therapy (LTOT)** in hypoxic patients [1].

Q: Pleural effusion with very low glucose is typically associated with which of the following conditions?

Rheumatoid Arthritis. In the context of pleural effusion, a **"very low glucose"** level is typically defined as **<30 mg/dL**. **1. Why Rheumatoid Arthritis (RA) is correct:** Rheumatoid pleural effusion is characterized by the most profound reduction in glucose levels among all pleural exudates. The underlying mechanism involves a **selective defect in the transport of glucose** across the inflamed pleural membrane, combined with high metabolic activity (glycolysis) by pleural macrophages and neutrophils. In RA, glucose levels are frequently <30 mg/dL and can even be 0 mg/dL [1]. **2. Analysis of Incorrect Options:** * **Malignancy:** While malignant effusions often have low glucose due to high metabolic consumption by tumor cells, the levels usually range between **30–60 mg/dL**. It rarely drops below 30 mg/dL [1]. * **Tuberculosis (TB):** Similar to malignancy, TB effusions are exudative and typically show glucose levels in the **40–60 mg/dL** range. * **Systemic Lupus Erythematosus (SLE):** Pleural glucose in SLE is usually **normal (>60 mg/dL)**. This is a key biochemical marker used to differentiate SLE pleuritis from Rheumatoid pleuritis [1]. **3. NEET-PG High-Yield Pearls:** * **Differential for Low Pleural Glucose ( 1000 U/L) [1]. * **Complement Levels:** Both RA and SLE effusions will show **low complement (CH50)** levels, but glucose helps distinguish them.

Q: A 64-year-old man presents with fever, chills, and increasing shortness of breath. The patient appears in acute respiratory distress and complains of pleuritic chest pain. Physical examination shows crackles and decreased breath sounds over both lung fields. The patient exhibits tachypnea with flaring of the nares. The sputum is rusty-yellow and displays numerous neutrophils and erythrocytes. The patient is appropriately treated with antibiotics. Which of the following is the most likely outcome?

Resolution. The clinical presentation of fever, pleuritic chest pain, rusty sputum [1], and bilateral crackles in an elderly patient is classic for **Community-Acquired Pneumonia (CAP)**, most commonly caused by *Streptococcus pneumoniae*. **1. Why Resolution is the Correct Answer:** In the majority of cases of lobar pneumonia, especially when treated promptly with appropriate antibiotics, the inflammatory exudate within the alveoli undergoes enzymatic digestion by neutrophils. This debris is then either resorbed by macrophages or coughed up. Crucially, the **alveolar basement membrane remains intact**, allowing for the complete restoration of normal lung architecture. This process is known as **Resolution**. **2. Analysis of Incorrect Options:** * **A. Abscess formation:** This occurs when there is localized tissue necrosis and suppuration (common with *Staph. aureus* or *Klebsiella*). While a complication, it is not the *most likely* outcome in a patient receiving appropriate treatment. * **B. Bronchopleural fistula:** This is a rare, severe complication involving a communication between the bronchial tree and the pleural space, usually following a ruptured abscess or necrotizing pneumonia [2]. * **C. Bullous emphysema:** This is a chronic obstructive pulmonary disease (COPD) pathology characterized by permanent enlargement of airspaces and wall destruction, not an acute sequela of pneumonia. **Clinical Pearls for NEET-PG:** * **Stages of Lobar Pneumonia:** Congestion → Red Hepatization → Gray Hepatization → Resolution. * **Rusty Sputum:** Pathognomonic for *Streptococcus pneumoniae* (due to altered hemoglobin from lysed RBCs) [1]. * **Organization:** If the exudate is not resolved, it may be replaced by fibroblasts, leading to permanent scarring (Organizing Pneumonia). * **Radiology:** Radiological resolution usually lags behind clinical improvement by 4–6 weeks.

Q: A 28-year-old pregnant woman develops sudden onset of dyspnea and tachycardia with no other physical findings. Which of the following is the most likely diagnosis?

pulmonary embolism. **Explanation:** **Correct Answer: B. Pulmonary Embolism** Pregnancy is a well-known **hypercoagulable state** due to an increase in clotting factors (I, VII, VIII, IX, X), a decrease in Protein S, and venous stasis from the gravid uterus. **Pulmonary Embolism (PE)** is a leading cause of maternal mortality. The classic clinical presentation is the **sudden onset of unexplained dyspnea and tachycardia** in a patient with no prior respiratory or cardiac history. In many cases, physical examination of the chest is remarkably normal, making the diagnosis highly dependent on clinical suspicion. **Why other options are incorrect:** * **A. Pulmonary Emphysema:** This is a chronic obstructive pulmonary disease (COPD) typically seen in long-term smokers. It presents with chronic, progressive dyspnea rather than an acute, sudden onset. * **C. Myocardial Infarction (MI):** While possible, MI in a 28-year-old is rare unless there are significant risk factors (e.g., familial hyperlipidemia). It usually presents with crushing chest pain and ECG changes, not isolated dyspnea. * **D. Ventricular Tachycardia:** This is a life-threatening arrhythmia that typically presents with palpitations, syncope, or hemodynamic collapse. While tachycardia is present, it is usually a *finding* of PE rather than the primary diagnosis in this clinical context. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation for PE in pregnancy:** CT Pulmonary Angiography (CTPA) is generally preferred over V/Q scan due to higher sensitivity and lower fetal radiation dose. * **Initial Screening:** D-dimer levels are physiologically elevated in pregnancy, so a positive result is non-specific; however, a **negative** D-dimer is still useful for ruling out PE. * **Treatment:** Low Molecular Weight Heparin (LMWH) is the drug of choice as it does not cross the placenta. Warfarin is contraindicated due to teratogenicity.

Q: A 70-year-old man presents with a 6-hour history of breathing difficulty and cough. On examination, his pulse rate is 120/min, BP is 80/40 mm Hg, and there is swelling in the left lower limb. Urgent venous Doppler of the left lower limb revealed left CFV thrombosis, and D-dimer assay was positive. CT pulmonary angiogram was performed. What is the most likely diagnosis?

Pulmonary embolism. **Explanation:** The clinical presentation is a classic triad for **Massive Pulmonary Embolism (PE)**. The patient exhibits sudden onset dyspnea, hemodynamic instability (BP 80/40 mm Hg), and signs of Deep Vein Thrombosis (DVT) in the left lower limb. 1. **Why Pulmonary Embolism is correct:** The presence of left Common Femoral Vein (CFV) thrombosis on Doppler and a positive D-dimer strongly suggest a thromboembolic event [3, 4]. In a patient with hypotension (obstructive shock), the diagnosis is **Massive PE** [1]. CT Pulmonary Angiogram (CTPA) is the gold standard investigation to confirm the presence of thrombi in the pulmonary arteries [3]. 2. **Why other options are incorrect:** * **Carcinoma Lung:** While it can cause cough and dyspnea, it does not typically present with acute hemodynamic collapse and acute DVT [2]. * **Tuberculosis:** Usually presents with a chronic history of fever, weight loss, and night sweats, rather than sudden onset shock and limb swelling [2]. * **Aortic Dissection:** Presents with "tearing" chest pain radiating to the back. While it causes hypotension, it would not explain the CFV thrombosis or the positive D-dimer in the context of limb swelling [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Virchow’s Triad:** Stasis, endothelial injury, and hypercoagulability are the precursors to DVT/PE. * **Gold Standard Investigation:** CT Pulmonary Angiogram (CTPA) [3]. * **ECG Findings:** Most common finding is **Sinus Tachycardia** [1]. The classic **S1Q3T3 pattern** (Deep S in Lead I, Q wave and inverted T in Lead III) is specific but not sensitive [1]. * **Management:** For Massive PE (hemodynamically unstable), the treatment of choice is **Thrombolysis** (e.g., Alteplase). For non-massive PE, anticoagulation (Heparin/LMWH) is preferred. * **Wells’ Score:** Used clinically to predict the probability of PE.

Q: Which of the following is NOT recommended for the treatment of a primary lung abscess?

Metronidazole. The treatment of a primary lung abscess requires coverage against a polymicrobial flora, typically consisting of **anaerobes** (found in the oropharynx) and **aerobic streptococci**. While Metronidazole is a potent anaerobicidal agent, it is **not recommended as monotherapy** for lung abscesses [1]. This is because primary lung abscesses are rarely caused by pure anaerobes; they almost always involve microaerophilic or aerobic streptococci, against which Metronidazole has **poor activity** [1, 2]. Clinical trials have shown high failure rates when Metronidazole is used alone compared to other regimens. It should only be used in combination with Penicillin or a Macrolide. **Clindamycin (Option B):** Historically the "gold standard" for lung abscesses. It provides excellent coverage against both anaerobes and Gram-positive cocci (Streptococci) [2]. **Amoxicillin-clavulanate (Option C):** Currently considered a first-line agent. The beta-lactamase inhibitor provides the necessary anaerobic coverage, while the amoxicillin covers the aerobic components. **Duration of treatment:** Unlike standard pneumonia, lung abscesses require prolonged antibiotic therapy (usually **3–6 weeks**) until the cavity disappears or only a small stable scar remains on imaging [3]. **Surgical drainage:** Rarely required (<10% of cases); medical management is successful in the vast majority but surgery should be contemplated if no improvement occurs despite medical therapy [3].

Question 1

What is the initial treatment for pulmonary embolism?

Accepted Answer

Anticoagulation

Answer

Fibrinolysis

Answer

Surgical embolectomy

Answer

Venacaval filter

Question 2

All of the following are causes of hemorrhagic pleural effusion except?

Accepted Answer

Rheumatoid arthritis

Answer

Pulmonary embolism

Answer

Pancreatitis

Answer

Tuberculosis

Question 3

A 25-year-old man presented to the emergency medicine department with acute onset sharp pain and dyspnea. His chest X-ray is provided. What is the diagnosis?

Accepted Answer

Spontaneous pneumothorax

Answer

Pleural effusion

Answer

Pulmonary embolism

Answer

Hydropneumothorax

Question 4

A patient on spirometry shows FEV1/FVC <0.7 and FEV1 >=30% but <50% predicted. What is the patient's diagnosis according to GOLD criteria?

Accepted Answer

Severe COPD

Answer

Mild COPD

Answer

Moderate COPD

Answer

Very severe COPD

Question 5

Pleural effusion with very low glucose is typically associated with which of the following conditions?

Accepted Answer

Rheumatoid Arthritis

Answer

Malignancy

Answer

Tuberculosis

Answer

Systemic Lupus Erythematosus (SLE)

Question 6

A 64-year-old man presents with fever, chills, and increasing shortness of breath. The patient appears in acute respiratory distress and complains of pleuritic chest pain. Physical examination shows crackles and decreased breath sounds over both lung fields. The patient exhibits tachypnea with flaring of the nares. The sputum is rusty-yellow and displays numerous neutrophils and erythrocytes. The patient is appropriately treated with antibiotics. Which of the following is the most likely outcome?

Accepted Answer

Resolution

Answer

Abscess formation

Answer

Bronchopleural fistula

Answer

Bullous emphysema

Question 7

A 33-year-old farmer presents with recurrent wheezing and coughing after working in a barn where hay is stored. He has no prior history of asthma and is not taking any medications. Physical examination reveals bibasilar crackles on auscultation, normal heart sounds, JVP of 2 cm above the sternal angle, and no peripheral edema. Laboratory investigations are normal with no increase in eosinophils on the CBC. Chest x-ray reveals patchy lower lobe infiltrates and a normal cardiac silhouette. What is the most likely diagnosis?

Accepted Answer

Hypersensitivity pneumonitis

Answer

Asthma

Answer

Chronic obstructive lung disease

Answer

Bronchiectasis

Question 8

A 28-year-old pregnant woman develops sudden onset of dyspnea and tachycardia with no other physical findings. Which of the following is the most likely diagnosis?

Accepted Answer

pulmonary embolism

Answer

pulmonary emphysema

Answer

myocardial infarction

Answer

ventricular tachycardia

Question 9

A 70-year-old man presents with a 6-hour history of breathing difficulty and cough. On examination, his pulse rate is 120/min, BP is 80/40 mm Hg, and there is swelling in the left lower limb. Urgent venous Doppler of the left lower limb revealed left CFV thrombosis, and D-dimer assay was positive. CT pulmonary angiogram was performed. What is the most likely diagnosis?

Accepted Answer

Pulmonary embolism

Answer

Carcinoma lung

Answer

Tuberculosis

Answer

Aortic dissection

Question 10

Which of the following is NOT recommended for the treatment of a primary lung abscess?

Accepted Answer

Metronidazole

Answer

Moxifloxacin

Answer

Clindamycin

Answer

Amoxicillin-clavulanate

Pulmonology — MCQs

Pulmonology — MCQs

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