Pulmonology Practice Questions

Q: Foreign body aspirated during dental procedures can be retrieved by?

Bronchoscopy. **Explanation:** **1. Why Bronchoscopy is the Correct Answer:** Foreign body aspiration (FBA) occurs when an object (such as a dental crown, bridge, or instrument) accidentally enters the respiratory tract. Because the trachea bifurcates into the bronchial tree, these objects typically lodge in the mainstem bronchi (most commonly the right main bronchus due to its more vertical orientation). **Bronchoscopy** is the gold standard for both the diagnosis and management of FBA. * **Rigid Bronchoscopy** is generally preferred in clinical practice for foreign body retrieval as it provides a stable airway, better visualization, and allows for the use of various grasping forceps to remove the object safely. **2. Why Other Options are Incorrect:** * **B. Gastroscopy:** This procedure involves the endoscopic examination of the upper gastrointestinal tract (esophagus, stomach, and duodenum). It is used if a patient *swallows* a foreign body (ingestion) rather than *aspirates* it. * **C. Arthroscopy:** This is a surgical procedure used by orthopedic surgeons to visualize, diagnose, and treat problems inside a joint (e.g., knee or shoulder). It has no role in the respiratory system. **3. Clinical Pearls for NEET-PG:** * **Most Common Site:** In adults, the **Right Main Bronchus** is the most common site for aspirated foreign bodies because it is wider, shorter, and more vertical than the left. * **Radiology:** Most dental foreign bodies are **radiopaque** (visible on X-ray). However, if the object is radiolucent, look for indirect signs like obstructive emphysema or atelectasis. * **Emergency Management:** If a patient has a complete airway obstruction (cannot speak or cough), the **Heimlich maneuver** is the immediate life-saving intervention before bronchoscopy. * **Gold Standard:** Rigid bronchoscopy remains the procedure of choice for foreign body removal in children, while flexible bronchoscopy may be used in select adult cases.

Q: Type II respiratory failure best relates to which of the following?

Alveolar hypoventilation. Respiratory failure is classified based on arterial blood gas (ABG) patterns [1]. **Type II Respiratory Failure** (Hypercapnic Respiratory Failure) is defined by a **PaCO₂ >45 mmHg**, usually accompanied by a PaO₂ <60 mmHg [3]. **Why Alveolar Hypoventilation is Correct:** The primary mechanism of Type II failure is **alveolar hypoventilation** [3]. Carbon dioxide (CO₂) levels in the blood are inversely proportional to alveolar ventilation. When the "pump" (respiratory muscles, chest wall, or CNS drive) fails to move enough air in and out of the lungs, CO₂ cannot be cleared, leading to hypercapnia [1]. Common causes include COPD, neuromuscular disorders (GBS, Myasthenia Gravis), and obesity hypoventilation syndrome [2]. **Analysis of Incorrect Options:** * **Alveolar Flooding (B) & Lung Atelectasis (D):** These conditions primarily cause **Type I Respiratory Failure** (Hypoxemic). They lead to a **V/Q mismatch or shunting**, where blood passes through non-ventilated alveoli [3]. While oxygenation drops significantly, CO₂ levels are usually low or normal because the patient hyperventilates to compensate [1]. * **Hypoperfusion of respiratory muscles (C):** While severe shock can lead to muscle fatigue and eventual failure, it is a secondary contributor rather than the defining pathophysiological mechanism of Type II failure. **High-Yield Clinical Pearls for NEET-PG:** * **Type I:** Hypoxemia with Normal/Low PaCO₂ (Mechanism: V/Q Mismatch) [3]. * **Type II:** Hypoxemia with **High PaCO₂** (Mechanism: Alveolar Hypoventilation) [3]. * **A-a Gradient:** In Type II failure due to extrapulmonary causes (e.g., drug overdose), the **A-a gradient is normal**. If the gradient is increased, it suggests intrinsic lung disease (e.g., COPD). * **Management:** The mainstay for Type II failure is improving ventilation, often via **Non-Invasive Ventilation (NIV/BiPAP)**.

Q: What is the most likely diagnosis?

Pulmonary artery hypertension. ***Pulmonary artery hypertension*** - Classic chest X-ray findings include **enlarged main pulmonary artery** and **right heart enlargement** with prominent right ventricle. - **Peripheral pruning** (oligemia) shows decreased vascular markings in outer lung fields due to elevated pulmonary pressures. *Interstitial lung disease* - Chest X-ray typically shows **reticular opacities** and **honeycombing** in lower zones, not the vascular changes seen here. - Associated with **progressive dyspnea** and **dry cough**, but lacks the cardiac enlargement pattern. *Congestive heart failure* - Presents with **cardiomegaly** and **pulmonary edema** showing **Kerley B lines** and **bat-wing** distribution. - **Bilateral pleural effusions** and **cephalization** of pulmonary vessels are common findings. *Bronchiectasis* - Characteristic **tram-track** and **ring shadows** representing dilated bronchi with thickened walls. - Associated with **recurrent infections** and **productive cough** with purulent sputum, not vascular prominence.

Q: Lower lobe fibrosis is typically seen in which of the following conditions?

Asbestosis. **Explanation** The distribution of pulmonary fibrosis is a high-yield topic in NEET-PG. The correct answer is **Asbestosis** because it characteristically involves the **lower lobes** (subpleural and basal regions) [1]. **1. Why Asbestosis is Correct:** Asbestos fibers are inhaled and deposited deep into the distal airways and alveoli. Due to their physical properties and the gravity-dependent nature of ventilation, they primarily affect the lower lobes [1]. Over time, this leads to interstitial fibrosis (asbestosis), often accompanied by pleural plaques [1]. **2. Why the Other Options are Incorrect:** * **Silicosis (A):** Typically involves the **upper lobes** [1]. It is characterized by silicotic nodules and "eggshell calcification" of hilar lymph nodes [1]. * **Sarcoidosis (B):** Predominantly affects the **upper and middle lobes**. It is a multisystem granulomatous disease characterized by bilateral hilar lymphadenopathy [1]. * **Cystic Fibrosis (C):** Bronchiectasis and subsequent fibrosis in CF characteristically start in the **upper lobes** (specifically the right upper lobe initially). **3. Clinical Pearls for NEET-PG:** To remember the distribution of interstitial lung diseases (ILD), use these mnemonics: * **Upper Lobe Fibrosis (SCART):** * **S**ilicosis / **S**arcoidosis * **C**oal Worker's Pneumoconiosis [1] * **A**nkylosing Spondylitis * **R**adiation (Upper zone) * **T**uberculosis / **T**errible Fungi (Histoplasmosis) * **Lower Lobe Fibrosis (BAD):** * **B**ronchiectasis * **A**sbestosis [1] * **D**rugs (Amiodarone, Methotrexate, Bleomycin) / **D**ermatomyositis (and other Connective Tissue Diseases like RA/SLE) / **I**diopathic Pulmonary Fibrosis (IPF) **Key Fact:** While most inorganic dusts (Silica, Coal) affect the upper lobes, **Asbestos is the notable exception** that affects the lower lobes [1].

Q: In ARDS, all are seen except:

Dilated bronchioles. Explanation: Acute Respiratory Distress Syndrome (ARDS) is characterized by diffuse alveolar damage (DAD) resulting from a severe inflammatory insult [1]. The pathophysiology follows a predictable sequence of stages: Exudative, Proliferative, and Fibrotic. **1. Why "Dilated Bronchioles" is the correct answer:** Dilated bronchioles (bronchiectasis) are not a characteristic feature of ARDS. In fact, the intense inflammation and subsequent fibrosis in ARDS typically lead to **traction bronchiectasis** (irregular widening) in late stages, but "dilated bronchioles" as a primary pathological hallmark is incorrect. Furthermore, the hallmark of ARDS is alveolar and interstitial pathology, not primary airway dilation. **2. Analysis of Incorrect Options:** * **Edema:** This is the hallmark of the **Exudative phase**. Increased capillary permeability leads to protein-rich fluid leaking into the alveolar spaces (non-cardiogenic pulmonary edema) [1]. * **Alveolar Damage:** Diffuse Alveolar Damage (DAD) is the histological "gold standard" for diagnosing ARDS. It involves damage to the alveolar-capillary membrane and the formation of characteristic **hyaline membranes**. * **Fibrosis:** This occurs during the **Fibrotic phase** (usually after 2-3 weeks). Chronic inflammation leads to collagen deposition and remodeling of the lung parenchyma, reducing lung compliance ("stiff lungs") [1]. **Clinical Pearls for NEET-PG:** * **Berlin Criteria:** Acute onset (<1 week), bilateral opacities on imaging, PaO2/FiO2 ratio <300 mmHg, and respiratory failure not fully explained by heart failure/fluid overload [1]. * **Histology:** Look for "Hyaline membranes" (composed of fibrin and cell debris) lining the alveoli. * **Management:** Low tidal volume ventilation (6 mL/kg) and prone positioning are high-yield strategies to reduce mortality.

Q: A chest X-ray shows a homogenous opacity on the right side with shifting of the mediastinum to the opposite side. What is the most probable diagnosis?

Pleural effusion. ### Explanation The correct answer is **Pleural effusion**. The key to solving this question lies in analyzing two radiological features: the nature of the opacity and the position of the mediastinum. **1. Why Pleural Effusion is correct:** A large pleural effusion presents as a **homogenous, dense opacity** (white-out) on a chest X-ray. Because fluid occupies space in the pleural cavity, it exerts **positive pressure**, pushing the mediastinal structures (trachea and heart) away from the side of the lesion (**contralateral shift**). **2. Why the other options are incorrect:** * **Collapse (A):** While collapse also presents as an opacity, it results in a loss of lung volume. This creates negative pressure, which **pulls** the mediastinum toward the side of the lesion (**ipsilateral shift**). * **Pneumothorax (C):** This presents as an area of hyperlucency (increased blackness) due to air, not an opacity. While a tension pneumothorax causes a contralateral shift, the radiological appearance is dark, not white. * **Consolidation (D):** This presents as an opacity (often with air bronchograms), but it typically does not cause a significant shift of the mediastinum because the lung volume remains relatively unchanged [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Mediastinal Shift Rule:** * **Push (Away):** Large Pleural Effusion, Tension Pneumothorax, Large Diaphragmatic Hernia. * **Pull (Towards):** Lung Collapse (Atelectasis), Pneumonectomy, Pleural Fibrosis. * **Ellis S-shaped curve:** The characteristic upper border of a moderate pleural effusion on an X-ray. * **Costophrenic angle blunting:** The earliest radiological sign of pleural effusion (seen when fluid >175–200 ml on PA view).

Question 1

A 25-year-old male smoker presents with high-grade fever, chills, severe right-sided pleuritic chest pain, and cough with expectoration. Physical examination of the patient is likely to show which of the following?

Accepted Answer

Bronchial breath sounds

Answer

Increased percussion sounds

Answer

Decreased vocal fremitus

Answer

Decreased vocal resonance

Question 2

Residual lung volume is increased in which of the following conditions?

Accepted Answer

Emphysema

Answer

Obesity

Answer

Bacterial pneumonia

Answer

Idiopathic pulmonary fibrosis

Question 3

Foreign body aspirated during dental procedures can be retrieved by?

Accepted Answer

Bronchoscopy

Answer

Gastroscopy

Answer

Arthroscopy

Answer

None of the above

Question 4

Type II Respiratory failure is characterized by?

Accepted Answer

Low PaO2 / High PaCO2

Answer

Low PaO2 / Low PaCO2

Answer

Normal PaCO2 / Low PaO2

Answer

High PaO2 / Low PaCO2

Question 5

Type II respiratory failure best relates to which of the following?

Accepted Answer

Alveolar hypoventilation

Answer

Alveolar flooding

Answer

Hypoperfusion of respiratory muscles

Answer

Lung atelectasis

Question 6

What is the most likely diagnosis?

Accepted Answer

Pulmonary artery hypertension

Answer

Interstitial lung disease

Answer

Congestive heart failure

Answer

Bronchiectasis

Question 7

Lower lobe fibrosis is typically seen in which of the following conditions?

Accepted Answer

Asbestosis

Answer

Silicosis

Answer

Sarcoidosis

Answer

Cystic Fibrosis

Question 8

In ARDS, all are seen except:

Accepted Answer

Dilated bronchioles

Answer

Edema

Answer

Fibrosis

Answer

Alveolar damage

Question 9

A chest X-ray shows a homogenous opacity on the right side with shifting of the mediastinum to the opposite side. What is the most probable diagnosis?

Accepted Answer

Pleural effusion

Answer

Collapse

Answer

Pneumothorax

Answer

Consolidation

Question 10

Which of the following is not a feature of consolidation?

Accepted Answer

Tracheal shift to the side of consolidation

Answer

Increased vocal resonance

Answer

Dull percussion note

Answer

Bronchial breath sounds

Pulmonology — MCQs

Pulmonology — MCQs

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