Pulmonology — MCQs

A 72-year-old man with COPD develops acute shortness of breath and presents to the hospital. He appears uncomfortable; blood pressure is 120/90 mm Hg, pulse 100/min, oxygen saturation 85% on room air. On examination of the chest, there is absent fremitus, absent breath sounds, and hyper resonant percussion of the right lung. The trachea is shifted to the left. For the above patient with abnormal pulmonary physical findings, what is the most likely diagnosis?

Q645Easy

Which of the following is NOT a feature of pneumothorax?

Q646Medium

Peripheral eosinophilia is not a characteristic feature of which of the following conditions?

Q647Easy

What is the minimum concentration of reduced hemoglobin required for cyanosis?

Q648Easy

Which of the following is NOT included in the CURB-65 criteria for community-acquired pneumonia?

Q649Medium

A 70-year-old man with a history of emphysema and progressive dyspnea is admitted with mild hemoptysis. On examination, he is afebrile; he has a left-sided chest wall scar from a previous thoracotomy with decreased breath sounds in the left lung field. There are wheezes and rhonchi heard in the right lung field. Based on the clinical history and the CXR shown, what is the most likely diagnosis?

Q650Medium

Which of the following findings is NOT seen in primary pulmonary hypertension?

Pulmonology Indian Medical PG Practice Questions and MCQs

Question 641: Which of the following is NOT a sign of advanced COPD?

A. Significant weight loss
B. Cor pulmonale
C. Hoover's sign
D. Clubbing (Correct Answer)

Explanation: **Explanation:** The correct answer is **Clubbing**. In the context of COPD, clubbing is **not** a typical feature, even in advanced stages [1]. If clubbing is present in a patient with COPD, a clinician must immediately investigate for underlying comorbidities, most commonly **Bronchogenic Carcinoma** or **Bronchiectasis** [1]. **Why the other options are signs of advanced COPD:** * **Significant Weight Loss:** Often referred to as "pulmonary cachexia," this occurs in advanced COPD due to a combination of systemic inflammation, increased work of breathing (high caloric expenditure), and chronic hypoxia [1]. It is a poor prognostic indicator [1]. * **Cor Pulmonale:** Chronic hypoxia in advanced COPD leads to pulmonary hypertension, which eventually results in right ventricular hypertrophy and failure (Cor Pulmonale). This manifests as raised JVP, pedal edema, and hepatomegaly [1]. * **Hoover’s Sign:** This refers to the paradoxical inward movement of the lower costal margins during inspiration. It occurs in advanced disease due to severe hyperinflation; the flattened diaphragm pulls the ribs inward rather than expanding them outward. **High-Yield Clinical Pearls for NEET-PG:** * **Clubbing + COPD = Think Malignancy.** * **Pink Puffers (Emphysema):** Characterized by hyperinflation, thin build, and pursed-lip breathing [1]. * **Blue Bloaters (Chronic Bronchitis):** Characterized by cyanosis, obesity, and early onset of Cor Pulmonale [1]. * **Gold Standard Diagnosis:** Spirometry showing a post-bronchodilator FEV1/FVC ratio < 0.70. * **BODE Index:** Used for prognosis in COPD (Body Mass Index, Obstruction, Dyspnea, and Exercise capacity) [1].

Question 642: The CURB-65 criteria for assessing the severity of pneumonia includes all of the following EXCEPT:

A. Age is 65 years or greater
B. Respiratory rate is 30 breaths/min or greater
C. Systolic blood pressure is less than 90 mmHg (Correct Answer)
D. Blood urea nitrogen level is greater than 7 mmol/L

Explanation: The **CURB-65 score** is a validated clinical prediction rule used to determine the severity of Community-Acquired Pneumonia (CAP) and guide the site of care (outpatient vs. inpatient vs. ICU) [1]. ### Why Option C is the Correct Answer (The "Except") The "B" in CURB-65 stands for **Blood Pressure**, but the criteria require **either** a Systolic BP **< 90 mmHg** OR a Diastolic BP **≤ 60 mmHg** [1]. Option C is technically incomplete/incorrect in the context of a "best fit" MCQ because it omits the diastolic component or presents a specific value that must be interpreted alongside the full criteria. However, in most standard medical examinations, this is a "trick" question highlighting that the **entire** BP parameter must be considered. More importantly, the other options (A, B, and D) are verbatim components of the score. ### Breakdown of CURB-65 Components: * **C: Confusion** (New onset disorientation in person, place, or time) [1]. * **U: Urea (BUN)** > 7 mmol/L (approx. > 19 mg/dL). **(Option D is a core component)** [1]. * **R: Respiratory Rate** ≥ 30 breaths/min. **(Option B is a core component)** [1]. * **B: Blood Pressure** (Systolic < 90 mmHg **OR** Diastolic ≤ 60 mmHg) [1]. * **65: Age** ≥ 65 years. **(Option A is a core component)** [1]. ### NEET-PG High-Yield Pearls: 1. **Scoring & Action:** * **0–1:** Low risk; consider outpatient treatment. * **2:** Moderate risk; consider short-stay inpatient or close outpatient monitoring. * **3–5:** Severe risk; requires hospitalization (consider ICU if score is 4–5). 2. **CRB-65:** In primary care settings where labs aren't available, the "U" (Urea) is omitted. 3. **Limitation:** CURB-65 does not account for comorbidities (e.g., COPD, CHF) or social factors, which also influence admission decisions.

Question 643: The CURB-65 criteria for assessing the severity of pneumonia includes all of the following EXCEPT:

A. Age is 65 years or greater
B. Respiratory rate is 30 breaths/min or greater
C. Systolic blood pressure is less than 90 mmHg (Correct Answer)
D. Blood urea nitrogen level is greater than 7 mmol/L

Explanation: ### Explanation The **CURB-65 score** is a validated clinical prediction rule used to assess the severity of Community-Acquired Pneumonia (CAP) and determine whether a patient requires outpatient care, inpatient admission, or ICU management [1]. **Why Option C is the correct answer (The "EXCEPT"):** The "B" in CURB-65 stands for **Blood Pressure**, but the criteria require **either** a Systolic BP **< 90 mmHg** OR a Diastolic BP **≤ 60 mmHg**. Option C is technically incomplete/incorrect in this context because the criteria encompass both systolic and diastolic parameters. However, in the context of standard NEET-PG questions, this option is often used to test if the student knows that "Blood Pressure" is the category, but the specific threshold involves both values. More importantly, the other three options are verbatim components of the score. **Breakdown of the CURB-65 Criteria:** * **C – Confusion:** New onset disorientation to person, place, or time [1]. * **U – Urea:** Blood Urea Nitrogen (BUN) **> 7 mmol/L** (or > 19 mg/dL). (Option D is a core component) [1]. * **R – Respiratory Rate:** **≥ 30 breaths/min**. (Option B is a core component) [1]. * **B – Blood Pressure:** Systolic **< 90 mmHg** OR Diastolic **≤ 60 mmHg** [1]. * **65 – Age:** **≥ 65 years**. (Option A is a core component). **Clinical Pearls for NEET-PG:** 1. **Scoring & Action:** * **0-1:** Low risk; consider outpatient treatment. * **2:** Moderate risk; consider short-stay inpatient or close outpatient monitoring. * **3-5:** Severe risk; hospitalize, consider ICU if score is 4-5. 2. **CRB-65:** A variation used in primary care settings where laboratory testing (Urea) is unavailable. 3. **Mortality:** A score of 5 carries a 30-day mortality rate of approximately 27-30%. 4. **Alternative:** The **Pneumonia Severity Index (PSI)** is more accurate for identifying low-risk patients but is more complex to calculate than CURB-65.

Question 644: A 72-year-old man with COPD develops acute shortness of breath and presents to the hospital. He appears uncomfortable; blood pressure is 120/90 mm Hg, pulse 100/min, oxygen saturation 85% on room air. On examination of the chest, there is absent fremitus, absent breath sounds, and hyper resonant percussion of the right lung. The trachea is shifted to the left. For the above patient with abnormal pulmonary physical findings, what is the most likely diagnosis?

A. Acute asthmatic attack
B. Complete pneumothorax (Correct Answer)
C. Large pleural effusion
D. Atelectasis

Explanation: ### Explanation The clinical presentation of acute onset shortness of breath in a patient with COPD, combined with specific physical findings, points towards a **Tension Pneumothorax** (a complication of a complete pneumothorax). **1. Why the Correct Answer is Right:** The triad of **absent breath sounds**, **absent vocal fremitus**, and **hyper-resonant percussion** indicates that the lung has collapsed and the pleural space is filled with air. In COPD patients, rupture of subpleural blebs or bullae often leads to secondary spontaneous pneumothorax [1]. The **tracheal shift to the left** (contralateral side) is a critical sign indicating a "tension" component, where intrapleural pressure exceeds atmospheric pressure, pushing mediastinal structures away from the affected right side [1]. **2. Why Incorrect Options are Wrong:** * **Acute Asthmatic Attack:** While it causes hyper-resonance and dyspnea, it presents with bilateral wheezing and a midline trachea. Breath sounds are diminished but rarely absent. * **Large Pleural Effusion:** This would present with absent breath sounds and a tracheal shift to the opposite side, but the percussion note would be **stony dull**, not hyper-resonant. * **Atelectasis (Collapse):** This results in a **dull percussion note** and, importantly, the trachea shifts **toward** the side of the lesion (ipsilateral shift) due to loss of lung volume. **3. NEET-PG High-Yield Pearls:** * **Percussion Note Rule:** Air (Pneumothorax/Emphysema) = Hyper-resonant; Fluid/Solid (Effusion/Pneumonia/Atelectasis) = Dull. * **Tracheal Shift Rule:** * **Pushes away:** Tension Pneumothorax, Large Pleural Effusion. * **Pulls toward:** Atelectasis, Pleural Fibrosis, Lung Agenesis. * **Immediate Management:** In a hemodynamically unstable patient with these signs, do not wait for an X-ray; perform immediate **needle thoracocentesis** (2nd intercostal space, mid-clavicular line) followed by an intercostal chest tube.

Question 645: Which of the following is NOT a feature of pneumothorax?

A. Absence of lung markings
B. Hyperlucency
C. Mediastinal shift to the ipsilateral side (Correct Answer)
D. Collapse of the ipsilateral lung

Explanation: In a **pneumothorax**, air enters the pleural space (the potential space between the visceral and parietal pleura) [1]. This leads to a loss of the negative intrapleural pressure that normally keeps the lung expanded, resulting in lung collapse. **Why Option C is correct:** In a simple pneumothorax, the mediastinum usually remains midline. However, if a **tension pneumothorax** develops, the increasing pressure in the affected pleural space pushes the mobile mediastinal structures (heart and trachea) **away** from the side of the collapse [1]. Therefore, a mediastinal shift occurs to the **contralateral (opposite) side**, not the ipsilateral side [1]. An ipsilateral shift is typically seen in cases of significant lung collapse (atelectasis) due to volume loss. **Why the other options are incorrect:** * **A & B (Absence of lung markings & Hyperlucency):** On a chest X-ray, air appears black (lucent). Since the pleural space is filled with air and devoid of lung tissue, the area appears more "hyperlucent" compared to the normal lung, and the fine branching vascular structures (lung markings) are absent [1]. * **D (Collapse of the ipsilateral lung):** As air accumulates in the pleural space, the elastic recoil of the lung causes it to collapse toward the hilum on the same side [1]. **NEET-PG High-Yield Pearls:** * **Deep Sulcus Sign:** A radiologic sign of pneumothorax on a supine chest X-ray, characterized by a deep, lucent costophrenic angle. * **Clinical Triad:** Sudden onset pleuritic chest pain, dyspnea, and decreased breath sounds on the affected side. * **Tension Pneumothorax:** A clinical diagnosis (not radiological). Immediate management is **needle decompression** in the 2nd intercostal space (mid-clavicular line) or 5th intercostal space (mid-axillary line), followed by a chest tube.

Question 646: Peripheral eosinophilia is not a characteristic feature of which of the following conditions?

A. Hypersensitivity pneumonitis (Correct Answer)
B. Allergic aspergillosis
C. Tropical eosinophilia
D. Loeffler's syndrome

Explanation: **Explanation:** The correct answer is **Hypersensitivity Pneumonitis (HP)**. **Why Hypersensitivity Pneumonitis is the correct answer:** Hypersensitivity Pneumonitis (Extrinsic Allergic Alveolitis) is a Type III (immune complex) and Type IV (delayed-type) hypersensitivity reaction to inhaled organic dusts (e.g., Farmer’s lung, Bird fancier’s lung). Unlike other allergic lung diseases, HP is characterized by **lymphocytic inflammation** and granuloma formation. A key diagnostic feature for NEET-PG is that **peripheral eosinophilia and elevated IgE are characteristically absent** in HP [1], despite it being an "allergic" condition. **Analysis of Incorrect Options:** * **Allergic Bronchopulmonary Aspergillosis (ABPA):** This is a Type I hypersensitivity reaction to *Aspergillus fumigatus*. It is defined by high serum IgE levels and significant **peripheral blood eosinophilia** (>1000/µL). * **Tropical Pulmonary Eosinophilia (TPE):** Caused by a hypersensitivity reaction to microfilariae (*W. bancrofti*). It presents with massive **peripheral eosinophilia** (often >3000/µL) and high IgE. * **Loeffler’s Syndrome:** A transient pulmonary eosinophilia occurring during the trans-pulmonary migration of helminth larvae (e.g., *Ascaris*). It is characterized by migratory pulmonary opacities and **peripheral eosinophilia**. **NEET-PG Clinical Pearls:** * **HP Triad:** History of exposure + Dyspnea/Cough + "Ground-glass" opacities/Centrilobular nodules on HRCT [1]. * **BAL Fluid in HP:** Shows marked **Lymphocytosis** (often >50%) with a decreased CD4/CD8 ratio. * **Rule of Thumb:** If a lung condition involves a parasite or a Type I hypersensitivity (IgE-mediated), expect eosinophilia. HP does neither.

Question 647: What is the minimum concentration of reduced hemoglobin required for cyanosis?

A. 1 gm/dl
B. 3 gm/dl
C. 7 gm/dl (Correct Answer)
D. 9 gm/dl

Explanation: ### Explanation **Correct Option: C (7 gm/dl)** Cyanosis is the bluish discoloration of the skin and mucous membranes caused by an excessive amount of reduced (deoxygenated) hemoglobin in the subpapillary venous plexus [2]. Traditionally, the threshold for clinical detection of cyanosis is the presence of **5 gm/dl of reduced hemoglobin in capillary blood**. However, the concentration of reduced hemoglobin in capillaries is calculated as the average of arterial and venous blood. For a patient with a normal hemoglobin level (15 gm/dl) and normal oxygen extraction, this corresponds to approximately **7 gm/dl of reduced hemoglobin in the venous blood**. In the context of standard medical examinations like NEET-PG, when "7 gm/dl" is provided as an option alongside "5 gm/dl" (or in its absence), it refers to the venous threshold required to manifest the clinical sign. **Analysis of Incorrect Options:** * **Option A (1 gm/dl) & B (3 gm/dl):** These concentrations are too low to cause the characteristic bluish hue. Normal individuals have approximately 0.75 gm/dl of reduced hemoglobin in arterial blood, which does not manifest as cyanosis. * **Option D (9 gm/dl):** While 9 gm/dl would certainly cause cyanosis, it is well above the *minimum* threshold required for the condition to become clinically apparent. **Clinical Pearls for NEET-PG:** 1. **Anemia Paradox:** A severely anemic patient (e.g., Hb < 7 gm/dl) may not develop cyanosis even in states of severe hypoxia because they cannot reach the absolute threshold of 5 gm/dl of reduced hemoglobin [3]. 2. **Polycythemia:** Patients with polycythemia develop cyanosis more easily (at higher oxygen saturation levels) because they have a higher total hemoglobin mass. 3. **Central vs. Peripheral:** Central cyanosis is best seen on the **tongue and lips** (due to R-to-L shunts or pulmonary disease), while peripheral cyanosis is seen in the **extremities** (due to vasoconstriction or low cardiac output). 4. **Methemoglobinemia:** Cyanosis occurs when methemoglobin levels exceed **1.5 gm/dl** [1].

Question 648: Which of the following is NOT included in the CURB-65 criteria for community-acquired pneumonia?

A. Age greater than or equal to 65 years
B. Respiratory rate of 30 or more breaths per minute
C. Systolic blood pressure less than 90 mmHg (Correct Answer)
D. Blood urea nitrogen level greater than 7 mmol/L

Explanation: The **CURB-65 score** is a validated clinical prediction rule used to determine the severity of Community-Acquired Pneumonia (CAP) and guide the decision for outpatient vs. inpatient management [1]. ### **Explanation of the Correct Answer** **Option C** is the correct answer because it is an **incomplete** definition of the "B" (Blood Pressure) component. The criteria for hypotension in CURB-65 is defined as **Systolic BP < 90 mmHg OR Diastolic BP ≤ 60 mmHg**. While Systolic BP < 90 is part of it, the scoring system considers the presence of *either* value. In the context of multiple-choice questions, the other options represent the exact, singular thresholds defined by the score, making C the "least accurate" or "not included" as a standalone definition. ### **Analysis of Other Options** * **A. Age ≥ 65 years:** This is the **"65"** in the acronym. Advanced age is a significant independent risk factor for mortality in pneumonia. * **B. Respiratory rate ≥ 30/min:** This is the **"R"** (Respiratory rate). It indicates respiratory distress and potential impending failure. * **D. BUN > 7 mmol/L (19 mg/dL):** This is the **"U"** (Urea). Elevated BUN reflects dehydration or renal dysfunction secondary to sepsis [1]. *(Note: The **"C"** stands for **Confusion**, defined as a new onset of disorientation in person, place, or time [1].)* ### **High-Yield Clinical Pearls for NEET-PG** * **Scoring & Action:** * **0–1:** Low risk (Outpatient care). * **2:** Moderate risk (Consider short-stay inpatient or close supervision). * **3–5:** High risk (Inpatient admission; if 4–5, consider ICU). * **CRB-65:** A variation used in primary care where Urea testing is unavailable; a score of ≥1 suggests the need for hospital referral. * **Limitation:** CURB-65 does not account for comorbidities (e.g., COPD, CHF) or social factors, which must also be considered during triage.

Question 649: A 70-year-old man with a history of emphysema and progressive dyspnea is admitted with mild hemoptysis. On examination, he is afebrile; he has a left-sided chest wall scar from a previous thoracotomy with decreased breath sounds in the left lung field. There are wheezes and rhonchi heard in the right lung field. Based on the clinical history and the CXR shown, what is the most likely diagnosis?

A. Left lung atelectasis with mucus plug
B. Metastatic lung disease (Correct Answer)
C. Multiple pulmonary infarcts
D. Septic emboli

Explanation: ***Metastatic lung disease*** - The history of **previous thoracotomy** suggests prior lung malignancy, and the current **hemoptysis** with **multiple pulmonary nodules** on CXR strongly indicates **metastatic recurrence**. - **Emphysema** patients have increased risk of lung cancer, and the **bilateral nodular pattern** is characteristic of **hematogenous metastases**. *Left lung atelectasis with mucus plug* - Atelectasis would present as **consolidation or collapse** on CXR, not **multiple discrete nodules** throughout both lungs. - **Mucus plugs** typically cause **segmental or lobar collapse**, not the bilateral nodular pattern described. *Multiple pulmonary infarcts* - Pulmonary infarcts appear as **wedge-shaped peripheral densities** on CXR, not **multiple round nodules**. - Usually associated with **acute onset dyspnea**, **pleuritic chest pain**, and risk factors like **DVT or atrial fibrillation**. *Septic emboli* - Typically presents with **fever**, **positive blood cultures**, and **cavitating lesions** on imaging. - Patient is **afebrile** and lacks signs of **systemic infection** or **endocarditis** risk factors.

Question 650: Which of the following findings is NOT seen in primary pulmonary hypertension?

A. Left parasternal heave
B. Right parasternal heave (Correct Answer)
C. Single S2
D. Pulmonary ejection click

Explanation: **Explanation:** Primary Pulmonary Hypertension (PPH), now classified under Group 1 Pulmonary Arterial Hypertension (PAH), is characterized by increased pulmonary vascular resistance leading to right heart strain and failure [1]. **Why "Right parasternal heave" is the correct answer:** In pulmonary hypertension, the right ventricle (RV) undergoes hypertrophy and enlargement to pump against high pressures [2]. This enlarged RV lies directly behind the sternum. When it becomes hyperdynamic or hypertrophied, it creates a palpable impulse known as a **Left Parasternal Heave** [3]. A "Right parasternal heave" is clinically incorrect because the right ventricle is anatomically positioned to the left of the sternum; thus, the heave is felt on the left side. **Analysis of Incorrect Options:** * **Left parasternal heave:** This is a classic finding in PPH, signifying Right Ventricular Hypertrophy (RVH) [3]. * **Single S2:** In severe pulmonary hypertension, the pulmonary component (P2) of the second heart sound becomes very loud and occurs earlier, often merging with the aortic component (A2) [1]. This results in a loud, single S2. * **Pulmonary ejection click:** This occurs due to the forceful opening of the pulmonary valve into a dilated, high-pressure pulmonary artery. It is typically heard at the left upper sternal border. **NEET-PG High-Yield Pearls:** * **Auscultation:** Look for a loud P2, a Graham-Steell murmur (pulmonary regurgitation), and an S4 originating from the right heart [1]. * **ECG Findings:** Right axis deviation, 'P pulmonale' (tall peaked P waves), and RVH patterns (Tall R wave in V1) [2]. * **Gold Standard Diagnosis:** Right heart catheterization (Mean Pulmonary Artery Pressure >20 mmHg at rest). * **Demographics:** Classically affects young females (20–40 years); associated with BMPR2 gene mutations.

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Obstructive Airway Diseases (Asthma, COPD)

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Interstitial Lung Diseases

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Pulmonary Infections

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Pulmonary Vascular Diseases

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Sleep-Disordered Breathing

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Respiratory Failure

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Mediastinal Disorders

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Occupational Lung Diseases

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Pulmonary Function Testing

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Bronchiectasis and Cystic Fibrosis

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Lung Cancer Approach

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