Pulmonology Practice Questions

Q: What is the most diagnostic test for pulmonary embolism in a high-risk case?

Multidetector CT angiography. The diagnosis of Pulmonary Embolism (PE) depends on the patient's clinical probability. In high-risk cases, the goal is rapid, definitive visualization of the pulmonary vasculature. **1. Why Multidetector CT Angiography (MDCTA) is correct:** MDCTA is currently the **first-line diagnostic investigation** and the "gold standard" in clinical practice for PE [1]. It offers high sensitivity and specificity (PIOPED II study) and has the advantage of being non-invasive, widely available, and capable of identifying alternative diagnoses (e.g., pneumonia, aortic dissection) [2]. Modern multidetector scanners can visualize even subsegmental emboli with high precision. **2. Why the other options are incorrect:** * **Catheter Angiography:** Historically the "reference standard," it is now rarely performed because it is invasive, carries a higher risk of complications, and MDCTA provides comparable diagnostic accuracy. * **D-dimer:** This test has a high negative predictive value but very low specificity. It is used to **rule out** PE in low-to-moderate risk patients. In a high-risk case, a D-dimer is unnecessary as a negative result would not override clinical suspicion. * **Ventilation-Perfusion (V/Q) Scan:** This is a second-line test, primarily reserved for patients with contraindications to CT contrast (e.g., renal failure or severe allergy) [1]. It often yields "indeterminate" results, requiring further testing. **Clinical Pearls for NEET-PG:** * **Initial Investigation of choice:** MDCTA. * **Best Initial Test (Screening):** Chest X-ray (to rule out other causes), though often normal or showing non-specific signs like *Westermark sign* [2] or *Hampton’s hump*. * **Investigation of choice in Pregnancy:** V/Q scan is often preferred to limit maternal breast radiation, though CTPA is also used. * **Gold Standard (Historical):** Invasive Pulmonary Angiography.

Q: Amylase increased in pleural fluid is seen in all of the following conditions except:

Rheumatoid arthritis. Pleural fluid amylase is considered elevated when it exceeds the upper limit of normal for serum amylase or when the pleural fluid-to-serum amylase ratio is >1.0. **Why Rheumatoid Arthritis (RA) is the correct answer:** In RA-associated pleural effusion, the characteristic biochemical markers are **very low glucose levels** (often <30 mg/dL), high LDH, and low pH [1]. Amylase levels are typically **normal**. Therefore, it is the "except" in this list. **Analysis of Incorrect Options:** * **Esophageal Perforation:** This causes the highest levels of pleural fluid amylase [1]. The amylase is **salivary** in origin, leaking through the mediastinum into the pleural space. * **Gallstone Pancreatitis:** Acute or chronic pancreatitis leads to elevated **pancreatic** amylase in the pleural fluid (usually left-sided) due to transdiaphragmatic lymphatic spread or fistula formation [2]. * **Malignancy:** Approximately 10% of malignant effusions (most commonly Adenocarcinoma of the lung or ovary) show elevated amylase [1]. In these cases, the amylase is usually the salivary isoenzyme produced by the tumor cells themselves. **High-Yield NEET-PG Pearls:** 1. **Differential for High Pleural Amylase:** Remember the mnemonic **"PEAM"** — **P**ancreatitis, **E**sophageal rupture, **A**denocarcinoma (Malignancy), and **M**esothelioma. 2. **RA Effusion Triad:** Low Glucose + High LDH + Low pH (and presence of RA cells/Ragocytes) [1]. 3. **Esophageal Rupture:** Look for low pH (often <6.0) and presence of squamous epithelial cells or food particles in the fluid [1]. 4. **Pancreatic Effusion:** The pleural fluid amylase level is often significantly higher than the concomitant serum amylase level [2].

Q: FEV1/FEVC ratio is decreased in all of the following conditions except?

Tuberculosis. The core concept tested here is the differentiation between **Obstructive** and **Restrictive** lung diseases using spirometry. ### **Explanation** The **FEV1/FVC ratio** is the primary tool to distinguish lung pathologies [1]. * In **Obstructive diseases**, air cannot be exhaled quickly due to airway narrowing or loss of elastic recoil. FEV1 decreases significantly more than FVC, leading to a **decreased ratio (<70%)** [1]. * In **Restrictive diseases**, lung volumes are reduced, but the airways remain patent. Both FEV1 and FVC decrease proportionately, or FVC decreases more, resulting in a **normal or increased ratio**. **Tuberculosis (Correct Answer):** TB typically causes parenchymal destruction and subsequent **fibrosis**. Pulmonary fibrosis is a classic **Restrictive Lung Disease**. Therefore, the FEV1/FVC ratio remains normal or is increased, not decreased. ### **Analysis of Incorrect Options** * **Bronchiectasis (A):** Characterized by permanent dilation of bronchi and mucus plugging, leading to airflow obstruction [3]. * **Emphysema (B):** A component of COPD where alveolar destruction leads to loss of elastic recoil and dynamic airway collapse during expiration [2]. * **Chronic Bronchitis (C):** Another component of COPD involving inflammation and mucus hypersecretion, causing significant airway obstruction. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Mnemonic for Obstructive Diseases:** **CBABE** (Cystic Fibrosis, Bronchitis, Asthma, Bronchiectasis, Emphysema). All these show a **decreased** FEV1/FVC ratio. 2. **Restrictive Pattern:** Seen in Interstitial Lung Disease (ILD), Sarcoidosis, Scoliosis, and Fibrosis (post-TB). Look for **decreased Total Lung Capacity (TLC)**. 3. **Flow-Volume Loops:** * *Obstructive:* "Scooped-out" appearance. * *Restrictive:* "Witch’s Hat" appearance (tall, narrow, shifted to the right).

Q: About respiratory failure, which of the following statements is false?

Type II failure does not have a fall in PaO2 (hypoxia).. ### Explanation **Why Option B is the Correct (False) Statement:** Respiratory failure is defined by the inability of the respiratory system to maintain adequate gas exchange [1]. **Type II respiratory failure (Hypercapnic)** is characterized by a primary failure of ventilation leading to elevated $PaCO_2$ (>45 mmHg) [2]. However, according to the alveolar gas equation, as $PaCO_2$ rises, the partial pressure of alveolar oxygen ($PAO_2$) must fall. Therefore, **Type II failure always involves hypoxia ($PaO_2$ < 60 mmHg)** unless the patient is breathing supplemental oxygen [2]. The statement that it does not have a fall in $PaO_2$ is physiologically incorrect. **Analysis of Other Options:** * **Option A (True):** Type III respiratory failure is specifically associated with **perioperative** conditions. It occurs due to decreased functional residual capacity (FRC) in the setting of abnormal abdominal wall mechanics, leading to basal atelectasis. * **Option C (True):** Type I respiratory failure is **Hypoxemic** failure [2]. It is defined by a $PaO_2$ < 60 mmHg with a normal or low $PaCO_2$. It is the most common form of respiratory failure [1]. * **Option D (True):** Pneumonia causes a V/Q mismatch and inflammatory exudate in the alveoli, which impairs oxygen diffusion [1]. This typically results in Type I failure [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Type IV Respiratory Failure:** Refers to respiratory failure due to **shock** (hypoperfusion), where respiratory muscles consume a disproportionate amount of cardiac output. * **A-a Gradient:** Useful for differentiating causes of Type I failure. It is **increased** in pneumonia/PE but **normal** in hypoventilation (e.g., opioid overdose) or high altitude. * **Gold Standard Diagnosis:** Arterial Blood Gas (ABG) analysis is essential to classify respiratory failure [2].

Q: What is the best initial treatment for massive pulmonary embolism?

Intravenous tissue plasminogen activator. **Explanation:** The management of Pulmonary Embolism (PE) is determined by hemodynamic stability. **Massive PE** is defined by the presence of sustained hypotension (systolic BP 15 minutes) or shock. **1. Why Option A is correct:** In massive PE, the immediate goal is to dissolve the obstructing clot to relieve right ventricular (RV) strain and restore systemic circulation. **Intravenous tissue plasminogen activator (tPA)**, such as Alteplase, is the treatment of choice because it actively lyses the thrombus [2]. Thrombolysis has been shown to improve hemodynamics faster than heparin alone in unstable patients. **2. Why the other options are incorrect:** * **Option B & D:** Heparin (Unfractionated or LMWH) and Warfarin are **anticoagulants**. They prevent the propagation of an existing clot and the formation of new ones, but they do *not* actively dissolve the current life-threatening obstruction. These are the treatments of choice for **non-massive (stable) PE** [2]. * **Option C:** Pulmonary thrombo-embolectomy (surgical or catheter-based) is a definitive treatment but is generally reserved for patients with massive PE who have **absolute contraindications to thrombolysis** or those who have failed systemic thrombolysis [2]. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** CT Pulmonary Angiography (CTPA) [1]. * **Most Common ECG Finding:** Sinus tachycardia (S1Q3T3 is specific but not sensitive). * **Sub-massive PE:** Defined by RV dysfunction or elevated Troponin/BNP but with **normal BP**. Treatment is usually anticoagulation, though "rescue thrombolysis" may be considered [2]. * **Absolute Contraindications to tPA:** Prior intracranial hemorrhage, known structural cerebrovascular lesion, ischemic stroke within 3 months, or active internal bleeding.

Q: A truck driver presented with a history of fever for four weeks and a dry cough. He also reports a weight loss of approximately 10 kg. X-ray shows bilateral reticulonodular infiltrates. What is the most likely diagnosis?

Pneumocystis pneumonia. The clinical presentation points toward an opportunistic infection in an immunocompromised host [1]. The patient’s occupation (truck driver) is a classic social high-yield marker in exams for high-risk behavior and potential HIV/AIDS [2]. **1. Why Pneumocystis pneumonia (PCP) is correct:** PCP, caused by *Pneumocystis jirovecii*, typically presents subacutely with a triad of **fever, dry cough, and progressive dyspnea**. Significant weight loss suggests underlying HIV [2]. Radiologically, PCP characteristically presents with **bilateral, symmetrical perihilar reticulonodular infiltrates** or "ground-glass" opacities [1]. The dry nature of the cough is a hallmark, as the organism does not cause alveolar exudate like typical bacteria. **2. Why the other options are incorrect:** * **Tuberculosis:** While common in HIV and causing weight loss, TB usually presents with a productive cough, hemoptysis, and focal findings (like upper lobe cavities or miliary patterns) rather than diffuse, symmetrical reticulonodular infiltrates [1]. * **Pneumococcal pneumonia:** This is an acute bacterial infection presenting with high-grade fever, productive "rusty" sputum, and **lobar consolidation** on X-ray, rather than a four-week chronic course with reticular patterns [4]. * **Interstitial Lung Disease (ILD):** While ILD shows reticulonodular patterns, it is a chronic, non-infectious inflammatory/fibrotic process [3]. It would not typically present with a four-week history of fever and rapid 10 kg weight loss. **Clinical Pearls for NEET-PG:** * **Investigation of choice:** Induced sputum or Bronchoalveolar Lavage (BAL) with **Gomori Methenamine Silver (GMS)** stain showing "crushed ping-pong ball" cysts [1]. * **Blood marker:** Elevated **Serum LDH** is highly sensitive for PCP in HIV patients. * **Treatment:** High-dose **TMP-SMX** is the drug of choice [1]. Add steroids if $PaO_2 35$ mmHg.

Question 1

What is the most diagnostic test for pulmonary embolism in a high-risk case?

Accepted Answer

Multidetector CT angiography

Answer

Catheter angiography

Answer

D-dimer

Answer

Ventilation perfusion scan

Question 2

Amylase increased in pleural fluid is seen in all of the following conditions except:

Accepted Answer

Rheumatoid arthritis

Answer

Esophageal perforation

Answer

Malignancy

Answer

Gallstone pancreatitis

Question 3

FEV1/FEVC ratio is decreased in all of the following conditions except?

Accepted Answer

Tuberculosis

Answer

Bronchiectasis

Answer

Emphysema

Answer

Chronic bronchitis

Question 4

What is the most common cause of acute cor pulmonale?

Accepted Answer

Pulmonary thromboembolism

Answer

Pneumonia

Answer

Chronic obstructive pulmonary disease

Answer

Primary spontaneous pneumothorax

Question 5

About respiratory failure, which of the following statements is false?

Accepted Answer

Type II failure does not have a fall in PaO2 (hypoxia).

Answer

Type III failure involves post-operative atelectasis.

Answer

Type I failure involves hypoxia (PaO2).

Answer

Pneumonia usually presents with type I respiratory failure.

Question 6

What is the best initial treatment for massive pulmonary embolism?

Accepted Answer

Intravenous tissue plasminogen activator

Answer

Heparin

Answer

Pulmonary thrombo-embolectomy

Answer

Low molecular weight heparin plus warfarin

Question 7

Which of the following are features of pulmonary embolism?

Accepted Answer

Respiratory alkalosis, Right axis deviation, Ventricular strain

Answer

Right axis deviation, Normal A-a Gradient, Ventricular strain

Answer

Respiratory alkalosis, Right axis deviation

Question 8

A truck driver presented with a history of fever for four weeks and a dry cough. He also reports a weight loss of approximately 10 kg. X-ray shows bilateral reticulonodular infiltrates. What is the most likely diagnosis?

Accepted Answer

Pneumocystis pneumonia

Answer

Tuberculosis

Answer

Pneumococcal pneumonia

Answer

Interstitial lung disease

Question 9

A 28-year-old man presents with coughing up blood and sputum. He has a history of recurrent pneumonias and a chronic cough productive of foul-smelling purulent sputum. He has no other past medical history and is a lifetime nonsmoker. On physical examination, there are no oral lesions, heart sounds are normal, and wet inspiratory crackles are heard at the lung bases posteriorly. He also has clubbing of his fingers, but there is no hepatosplenomegaly or any palpable lymph nodes. Chest X-ray shows fibrosis and pulmonary infiltrates in the right lower lung. Which of the following is the most appropriate initial diagnostic test?

Accepted Answer

Chest CT scan

Answer

Bronchoscopy

Answer

Bronchography

Answer

Open thoracotomy

Question 10

Pulmonary tuberculosis is more common in patients with which of the following associated diseases?

Accepted Answer

Mitral stenosis

Answer

Acquired immune deficiency syndrome

Answer

Diabetes mellitus

Answer

Chronic renal failure

Pulmonology — MCQs

Pulmonology — MCQs

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