Pulmonology

Pulmonology Indian Medical PG Question 1: Which class of bronchodilators is considered the most effective for managing chronic obstructive pulmonary disease (COPD)?

• A. Anticholinergic agents (Correct Answer)
• B. Beta-adrenergic agents
• C. Cholinergic agents
• D. Alpha-adrenergic agents

Pulmonology Explanation: ***Anticholinergic agents*** - **Anticholinergic agents** (LAMAs), like tiotropium, are proven most effective for **COPD** management due to their sustained bronchodilation and ability to reduce exacerbations [1], [2]. - They work by blocking the action of **acetylcholine** on muscarinic receptors in the airways, preventing bronchoconstriction [1]. *Beta-adrenergic agents* - **Beta-adrenergic agents** (LABAs) are also effective bronchodilators in COPD, but anticholinergics show a more consistent benefit in reducing **exacerbations** and improving lung function in long-term studies [2]. - While essential for bronchodilation, they primarily target beta-2 receptors, leading to immediate but sometimes less sustained effects compared to **LAMAs**. [2] *Cholinergic agents* - **Cholinergic agents** are typically **bronchoconstrictors** as they stimulate muscarinic receptors, leading to airway smooth muscle contraction. - They are generally contraindicated in asthma and COPD due to their ability to worsen **airway narrowing**. *Alpha-adrenergic agents* - **Alpha-adrenergic agents** primarily affect blood vessels and have minimal direct bronchodilatory effects on the airways. - They are not used as primary bronchodilators for **COPD**; their use might be restricted to systemic effects like decongestion.

Pulmonology Indian Medical PG Question 2: A patient presents with breathlessness and wheezing. Absolute eosinophil count is 500 cells/ $\mu \mathrm{L}$. Chest X-ray shows a miliary pattern. What is the most likely diagnosis?

• A. Tropical pulmonary eosinophilia (Correct Answer)
• B. Bronchial asthma
• C. Miliary Tuberculosis (TB)
• D. Hypersensitivity pneumonitis
• E. Allergic bronchopulmonary aspergillosis (ABPA)

Pulmonology Explanation: ***Tropical pulmonary eosinophilia*** - This condition is characterized by **eosinophilia** (absolute eosinophil count >500 cells/µL), **respiratory symptoms** such as breathlessness and wheezing, and a **miliary pattern** on chest X-ray, all consistent with the patient's presentation. - It results from a **hypersensitivity reaction** to microfilariae from Wuchereria bancrofti or Brugia malayi in individuals living in endemic regions. *Bronchial asthma* - While bronchial asthma can cause **breathlessness** and **wheezing**, a miliary pattern on chest X-ray is **not typical**, nor is an eosinophil count of 500 cells/µL, though eosinophilia can occur. - Asthma is primarily a disease of reversible airway obstruction, often triggered by **allergens** or irritants. *Miliary Tuberculosis (TB)* - **Miliary TB** would present with a miliary pattern on chest X-ray and breathlessness, but it is typically associated with **low or normal eosinophil counts**, and wheezing is less common. - Fever, night sweats, and weight loss are also common symptoms of Miliary TB. *Hypersensitivity pneumonitis* - This condition involves inflammation of the lung alveoli due to inhalation of organic dusts or chemicals, causing **breathlessness** and, occasionally, wheezing, but **eosinophilia is not a primary feature**. - Chest X-ray findings can be diverse, but a **miliary pattern** is less specific than for tropical pulmonary eosinophilia. *Allergic bronchopulmonary aspergillosis (ABPA)* - ABPA can present with **eosinophilia**, **wheezing**, and respiratory symptoms, but chest X-ray typically shows **central bronchiectasis** and **fleeting infiltrates** rather than a miliary pattern. - It occurs in patients with asthma or cystic fibrosis and is characterized by **hypersensitivity to Aspergillus fumigatus**.

Pulmonology Indian Medical PG Question 3: A 70-year-old smoker presents with chronic cough and hypoxia. What is the primary pathophysiological change in the alveoli contributing to hypoxia in emphysema?

• A. Loss of alveolar surface area (Correct Answer)
• B. Increased mucus production
• C. Increased alveolar-capillary membrane thickness
• D. Bronchial hyperreactivity

Pulmonology Explanation: ***Loss of alveolar surface area*** - In emphysema, the destructive process leads to the breakdown of **alveolar walls** [1], forming larger, fewer air sacs. This directly reduces the total **surface area available for gas exchange.** - A diminished surface area for gas exchange significantly impairs the transfer of oxygen into the blood, resulting in **hypoxia**. *Increased mucus production* - While chronic bronchitis (often coexisting with emphysema as part of COPD) does involve **increased mucus production** [2], it is not the primary pathophysiological change within the alveoli that causes hypoxia in emphysema. - Mucus primarily obstructs airways, leading to ventilation-perfusion mismatch, but the hallmark alveolar damage of emphysema is distinct. *Increased alveolar-capillary membrane thickness* - This change is characteristic of conditions like **pulmonary fibrosis** or **acute respiratory distress syndrome (ARDS)**, where interstitial fluid or fibrous tissue thickens the barrier between alveoli and capillaries [3]. - In emphysema, the primary issue is the **destruction** of the alveolar-capillary membrane, not its thickening, leading to reduced surface area and impaired gas exchange. *Bronchial hyperreactivity* - This is a key feature of **asthma**, where airways constrict excessively in response to various stimuli, leading to airflow obstruction. - While some patients with COPD (which includes emphysema) may exhibit a degree of bronchial hyperreactivity, it is not the **primary pathophysiological mechanism for alveolar hypoxia** in emphysema, which is centered on structural damage to the alveoli.

Pulmonology Indian Medical PG Question 4: A child of 2 years having a respiratory rate of 46 per minute shall be classified by a health worker as

• A. no pneumonia, cough or cold
• B. severe pneumonia
• C. very severe disease
• D. pneumonia (Correct Answer)

Pulmonology Explanation: ***Correct: Pneumonia*** - A respiratory rate of **46 breaths per minute** in a 2-year-old child falls within the criteria for **fast breathing**. According to World Health Organization (WHO) IMCI guidelines, fast breathing is defined as a respiratory rate ≥ 50 breaths/minute for children aged 2 months to 12 months, and **≥ 40 breaths/minute for children aged 12 months to 5 years**. - Fast breathing alone (without chest indrawing or danger signs) is the **key clinical sign** for classifying a child with cough or difficulty breathing as having **pneumonia**. - This is based on the **WHO IMCI classification** used by health workers for management of childhood illness. *Incorrect: No pneumonia, cough or cold* - This classification would be made if the child's respiratory rate was **within the normal range** for their age (< 40 breaths per minute for age 1-5 years) and if there were no other signs of pneumonia or severe disease. - A respiratory rate of 46 breaths per minute in a 2-year-old is **above the normal limit** and meets the criteria for fast breathing. *Incorrect: Severe pneumonia* - Severe pneumonia is classified by the presence of **chest indrawing** in addition to cough or difficult breathing, without danger signs. - While the child has fast breathing, the question does not mention **chest indrawing**, which is required for this classification. *Incorrect: Very severe disease* - Very severe disease is classified when there are **danger signs** present: inability to drink or breastfeed, persistent vomiting, convulsions, lethargy or unconsciousness, or stridor in a calm child. - The question only mentions elevated respiratory rate without any **danger signs**, so this classification does not apply.

Pulmonology Indian Medical PG Question 5: Which of the following is not true about ventilation-perfusion ratio (V/Q)?

• A. Low V/Q in shunt
• B. High V/Q in dead space
• C. V/Q is highest at lung base (Correct Answer)
• D. Normal V/Q is approximately 0.8

Pulmonology Explanation: ***V/Q is highest at lung base*** - This statement is **incorrect** because the **V/Q ratio is actually lowest at the lung base** and highest at the apex due to gravity's differential effects on ventilation and perfusion. - At the lung base, both ventilation and perfusion are highest, but **perfusion increases more significantly than ventilation**, leading to a lower V/Q ratio. *Low V/Q in shunt* - A **shunt** represents an extreme form of low V/Q, where there is **perfusion without ventilation (V/Q = 0)**. - This results in **unoxygenated blood** returning to the systemic circulation. *High V/Q in dead space* - **Dead space ventilation** occurs when there is **ventilation without perfusion (V/Q = infinity)**. - This means that air enters the alveoli but **no gas exchange** can occur because there is no blood flow. *Normal V/Q is approximately 0.8* - The **overall average V/Q ratio** for healthy lungs is indeed approximately **0.8**. - This value reflects the balance between **total alveolar ventilation** (around 4 L/min) and **total pulmonary blood flow** (around 5 L/min).

Pulmonology Indian Medical PG Question 6: Which physiological adaptation does not happen at high altitudes?

• A. Pulmonary vasoconstriction
• B. Respiratory acidosis (Correct Answer)
• C. Hypoxia
• D. Polycythemia

Pulmonology Explanation: ***Respiratory acidosis*** - At high altitudes, the primary physiological response to **hypoxia** is to increase ventilation, leading to a decrease in **arterial PCO2**. - This reduction in **PCO2** causes **respiratory alkalosis**, not acidosis, as the body tries to compensate for the lower oxygen levels. *Pulmonary vasoconstriction* - This is a significant physiological response to **hypoxia** at high altitudes, leading to an increase in **pulmonary artery pressure**. - Its purpose is to divert blood flow to better-ventilated areas of the lung, but it can also contribute to **pulmonary hypertension**. *Hypoxia* - Reduced **atmospheric pressure** at high altitudes directly results in a lower partial pressure of oxygen (**PO2**), leading to **hypoxia**. - This low **PO2** is the primary trigger for most other physiological adaptations seen at high altitudes. *Polycythemia* - Prolonged exposure to **hypoxia** stimulates the kidneys to release **erythropoietin (EPO)**, which in turn increases **red blood cell production**. - This adaptive increase in **red blood cell count** and **hemoglobin concentration** aims to enhance the oxygen-carrying capacity of the blood.

Pulmonology Indian Medical PG Question 7: To prevent ventilator associated pneumonia, the most effective and evidence based results are seen with which of the following for critically ill patients:

• A. Powered brushing
• B. Manual brushing
• C. Betadine mouthwash
• D. Oral hygiene procedures plus chlorhexidine (Correct Answer)

Pulmonology Explanation: Oral hygiene procedures plus chlorhexidine - **Chlorhexidine** mouthwash, when combined with mechanical oral hygiene, significantly reduces the oral bacterial load, preventing aspiration of pathogenic bacteria into the lungs. - This comprehensive approach is a **gold standard** strategy for VAP prevention in critically ill patients, supported by strong evidence. *Betadine mouthwash* - While Betadine (povidone-iodine) has **antiseptic properties**, its efficacy in preventing VAP is not as well-established or consistently supported by evidence as chlorhexidine. - There are concerns about potential **mucosal irritation** and systemic absorption with prolonged use in critically ill patients. *Powered brushing* - Though powered brushing can provide effective plaque removal, it primarily focuses on **mechanical cleaning** without the added antimicrobial benefits of an antiseptic agent like chlorhexidine. - Its effectiveness alone in preventing VAP has **not been shown to be superior** to comprehensive oral care including antiseptics. *Manual brushing* - Manual brushing is a basic component of oral hygiene but, similar to powered brushing, lacks the **antimicrobial action** necessary to drastically reduce bacterial colonization in critically ill, intubated patients. - It is important for general oral cleanliness but **insufficient on its own** for preventing VAP effectively.

Pulmonology Indian Medical PG Question 8: Which is not seen in heart failure?

• A. Cardiomegaly
• B. Kerley B lines
• C. Kerley A Lines
• D. Oligemia (Correct Answer)

Pulmonology Explanation: ***Oligemia*** - **Oligemia** refers to a reduced blood volume or total blood flow to a region, which is typically not observed in **heart failure**. - In **heart failure**, the body often experiences **fluid overload** and **pulmonary congestion**, leading to increased blood volume in the lungs, not reduced [1]. *Cardiomegaly* - **Cardiomegaly**, or an enlarged heart, is a common finding in **heart failure** as the heart muscle remodels and dilates to compensate for impaired pumping function [1], [3]. - This can be seen on a chest X-ray as an **increased cardiothoracic ratio** [1], [2]. *Kerley B lines* - **Kerley B lines** are thin, horizontal lines visible on a chest X-ray, typically found at the lung periphery. - They indicate **interstitial edema** due to increased pulmonary venous pressure, a characteristic sign of **pulmonary congestion** in **heart failure** [1]. *Kerley A Lines* - **Kerley A lines** are longer, less common lines seen radiating from the hila towards the upper lobes. - These lines represent **distended anastomotic channels** between pulmonary and systemic venous systems, also indicative of **pulmonary edema** and **heart failure** [1], [4].

Pulmonology Indian Medical PG Question 9: Which type of cardiomyopathy is associated with alcohol abuse?

• A. Hypertrophic cardiomyopathy
• B. Dilated cardiomyopathy (Correct Answer)
• C. Pericarditis
• D. Myocarditis

Pulmonology Explanation: ### Dilated cardiomyopathy - Chronic **alcohol abuse** is a well-established cause of **dilated cardiomyopathy**, leading to weakening and enlargement of the ventricles [1]. - This condition results in impaired systolic function and can cause **heart failure** [1]. *Hypertrophic cardiomyopathy* - This condition is primarily characterized by **pathological thickening of the heart muscle**, often genetic, and is not directly caused by alcohol abuse. - It leads to issues with relaxation and filling of the heart, rather than dilation and weakness. *Pericarditis* - **Pericarditis** is the inflammation of the sac surrounding the heart (pericardium), most commonly caused by viral infections, autoimmune diseases, or injury. - It is not directly linked to alcohol abuse as a primary cause. *Myocarditis* - **Myocarditis** is the inflammation of the heart muscle, often triggered by viral infections, autoimmune reactions, or certain medications. - While heavy alcohol use can weaken the heart, myocarditis is primarily an inflammatory process not directly caused by alcohol.

Pulmonology Indian Medical PG Question 10: Which test is most sensitive for screening/detecting pulmonary involvement in sarcoidosis?

• A. Bronchoalveolar lavage
• B. Chest X-ray (Correct Answer)
• C. Serum ACE levels
• D. Skin biopsy

Pulmonology Explanation: A **chest X-ray** is the most widely available and often the initial imaging modality performed in suspected sarcoidosis, showing characteristic patterns such as **bilateral hilar lymphadenopathy** [1]. While not confirmatory, its high sensitivity in detecting pulmonary involvement makes it a crucial preliminary diagnostic tool, especially given the frequency of lung involvement in sarcoidosis [1]. *Bronchoalveolar lavage* - **Bronchoalveolar lavage (BAL)** can show **lymphocytosis** with a high CD4/CD8 ratio, which is suggestive but not specific for sarcoidosis. - While supportive, BAL is an invasive procedure and less commonly the **initial diagnostic test** compared to a chest X-ray. *Serum ACE levels* - **Elevated serum angiotensin-converting enzyme (ACE)** levels can be found in sarcoidosis, reflecting granulomatous activity, but are neither sensitive nor specific enough for diagnosis. - ACE levels are elevated in only about **60% of patients** with active sarcoidosis and can be normal even in widespread disease, or elevated in other conditions. *Skin biopsy* - **Skin biopsy** can reveal **non-caseating granulomas** if there are cutaneous manifestations of sarcoidosis, which occur in about 20-30% of patients. - While diagnostic when positive, its use is limited to patients with **visible skin lesions** and it is not a screening test for systemic disease.

Pulmonology Flashcard 1 of 10

Question: The arterial blood profile seen in compensated respiratory acidosis is: pH: _____[HCO3-]: increasedPCO2: increased

Answer: decreased

Pulmonology Flashcard 2 of 10

Question: Type _____, also called as acute hypoxemic respiratory failure, is because of alveolar flooding and subsequent intrapulmonary shunt physiology

Answer: I

Pulmonology Flashcard 3 of 10

Question: What is the next step in managing a patient on standard oxygen therapy using bag and mask ventilation?_____

Answer: high flow nasal cannula/NIV

Pulmonology Flashcard 4 of 10

Question: _____ lung diseases are characterized by a FEV1/FVC ratio > 80%

Answer: Restrictive

Pulmonology Flashcard 5 of 10

Question: Patient with a positive vasoreactivity test using inhaled NO, _____ are used as first line for management of PAH

Answer: CCBs

Pulmonology Flashcard 6 of 10

Question: What type of upper airway obstruction is depicted by the following flow-volume loop? _____

Answer: Variable extrathoracic obstruction

Pulmonology Flashcard 7 of 10

Question: What type of upper airway obstruction is depicted by the following flow-volume loop? _____

Answer: Fixed upper airway obstruction

Pulmonology Flashcard 8 of 10

Question: Day symptoms lasting _____/week and night symptoms lasting d2nights/month with an FEV1 of  >80% is classified as mild intermittent asthma according to severity

Answer: d2 days

Pulmonology Flashcard 9 of 10

Question: Day symptoms lasting _____/week and night symptoms lasting >1 nights/week with an FEV1 of  60-80% is classified as moderate persistent asthma according to severity

Answer: daily

Pulmonology Flashcard 10 of 10

Question: _____ pleural effusion occurs due to thoracic duct injury from trauma or malignancy

Answer: Lymphatic