Bronchiectasis and Cystic Fibrosis Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Bronchiectasis and Cystic Fibrosis. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Bronchiectasis and Cystic Fibrosis Indian Medical PG Question 1: Cystic fibrosis leads to defect in which of the following channels?
- A. Cl- (Correct Answer)
- B. K+
- C. Ca2+
- D. Na+
Bronchiectasis and Cystic Fibrosis Explanation: ***Cl-***
- Cystic fibrosis is caused by a mutation in the **CFTR gene**, which encodes for the **Cystic Fibrosis Transmembrane Conductance Regulator protein**.
- This protein functions primarily as a **chloride channel**, and its dysfunction leads to impaired chloride transport across epithelial cell membranes.
*K+*
- While potassium channels are crucial for many physiological processes, their primary dysfunction is **not directly linked to the pathogenesis of cystic fibrosis**.
- Defects in potassium channels are associated with conditions like **long QT syndrome** or certain forms of epilepsy.
*Ca2+*
- **Calcium channels play a role in various cellular signaling pathways**, but their direct defect is not the underlying cause of cystic fibrosis.
- Conditions like **Lambert-Eaton myasthenic syndrome** involve antibodies affecting presynaptic calcium channels.
*Na+*
- **Sodium channels are involved in maintaining membrane potential and fluid balance**, and while they interact with CFTR, their primary defect is not the cause of cystic fibrosis.
- Dysregulation of sodium transport can occur secondary to CFTR dysfunction, leading to **dehydrated mucus**, but the initial defect is in chloride.
Bronchiectasis and Cystic Fibrosis Indian Medical PG Question 2: A 40-year-old man presented with repeated episodes of bronchospasm and hemoptysis. Chest X-ray revealed perihilar bronchiectasis. The most likely diagnosis is
- A. Sarcoidosis
- B. Idiopathic pulmonary fibrosis
- C. Extrinsic allergic alveolitis
- D. Bronchopulmonary aspergillosis (Correct Answer)
Bronchiectasis and Cystic Fibrosis Explanation: ***Bronchopulmonary aspergillosis***
- **Allergic bronchopulmonary aspergillosis (ABPA)** is characterized by **bronchospasm**, recurrent fleeting pulmonary infiltrates, and **hemoptysis** in patients with asthma or cystic fibrosis.
- The chest X-ray findings of **perihilar bronchiectasis** are a hallmark of ABPA, resulting from airway damage caused by the allergic response to *Aspergillus fumigatus*.
*Sarcoidosis*
- Sarcoidosis is a **granulomatous disease** that typically presents with non-caseating granulomas, often affecting the lungs, lymph nodes, eyes, and skin. [1]
- While it can cause respiratory symptoms, **bronchiectasis** and **hemoptysis** are not typical primary features; more common findings include bilateral hilar lymphadenopathy and interstitial lung disease. [1]
*Idiopathic pulmonary fibrosis*
- Idiopathic pulmonary fibrosis (IPF) is a **chronic, progressive interstitial lung disease** characterized by progressive scarring of the lung tissue. [2]
- While IPF causes respiratory symptoms like dyspnea and cough, it does not typically present with recurrent **bronchospasm**, **hemoptysis**, or **perihilar bronchiectasis**. [2]
*Extrinsic allergic alveolitis*
- Extrinsic allergic alveolitis, also known as **hypersensitivity pneumonitis**, is an immune-mediated lung disease caused by exposure to various inhaled antigens.
- It typically presents with flu-like symptoms, cough, and dyspnea, and while it can cause interstitial lung disease, **bronchospasm** and **bronchiectasis** are not characteristic features.
Bronchiectasis and Cystic Fibrosis Indian Medical PG Question 3: In bronchiectasis, all of the following are seen except:
- A. Recurring bouts of cough
- B. Haemoptysis
- C. Wheezing (Correct Answer)
- D. Clubbing
Bronchiectasis and Cystic Fibrosis Explanation: ***Wheezing***
- **Wheezing** is typically associated with conditions that cause airway narrowing, such as **asthma** or **COPD**.
- While some patients with bronchiectasis might have concomitant airway obstruction, wheezing is **not a universal or characteristic symptom** of bronchiectasis itself, which primarily involves permanent dilation and destruction of the bronchi.
*Clubbing*
- **Clubbing** (thickening of the nail beds) is a common sign in patients with **chronic suppurative lung diseases** like bronchiectasis, indicating chronic hypoxia and inflammation [2].
- It results from the **persistent inflammation** and increased vascularity in the distal digits.
*Haemoptysis*
- **Haemoptysis**, or coughing up blood, is a frequent and sometimes severe complication of bronchiectasis due to the **fragile, hypervascular bronchial walls** that easily bleed [1], [2].
- The dilated and inflamed bronchi are highly prone to **vascular damage**, leading to varying degrees of bleeding.
*Recurring bouts of cough*
- **Chronic cough** productive of large amounts of purulent sputum is the **hallmark symptom** of bronchiectasis, resulting from chronic infection and inflammation [1].
- The impaired mucociliary clearance leads to **stagnant mucus** and recurrent infections, triggering persistent coughing.
Bronchiectasis and Cystic Fibrosis Indian Medical PG Question 4: Ring sign with dilated bronchi on CXR is a feature of
- A. Asthma
- B. Bronchiolitis
- C. Candidiasis
- D. Bronchiectasis (Correct Answer)
Bronchiectasis and Cystic Fibrosis Explanation: ***Bronchiectasis***
- The "ring sign" on a Chest X-Ray (CXR) is characteristic of **bronchiectasis**, representing the cross-sectional view of a **dilated bronchus**.
- **Bronchial wall thickening** and dilation create this appearance, often accompanied by **"tram lines"** (parallel lines corresponding to longitudinal views of dilated bronchi).
*Asthma*
- CXR in asthma is often normal but may show signs of **hyperinflation** or **bronchial wall thickening** in severe cases.
- It does not typically present with the "ring sign" of permanently dilated bronchi.
*Bronchiolitis*
- This condition primarily affects the **small airways (bronchioles)** and is common in infants.
- CXR findings typically include **hyperinflation**, **peribronchial thickening**, and **atelectasis**, but not dilated bronchi forming ring signs.
*Candidiasis*
- Pulmonary candidiasis is a fungal infection that can cause various CXR findings like **infiltrates**, **nodules**, or **cavities**.
- It does not typically lead to bronchial dilation or the characteristic "ring sign" seen in bronchiectasis.
Bronchiectasis and Cystic Fibrosis Indian Medical PG Question 5: Chloride level in sweat is used in the diagnosis of which disease?
- A. Phenylketonuria
- B. Cystic fibrosis (Correct Answer)
- C. Gaucher's disease
- D. Osteogenesis imperfecta
- E. Tay-Sachs disease
Bronchiectasis and Cystic Fibrosis Explanation: ***Cystic fibrosis***
- **Cystic fibrosis** is characterized by a defect in the **CFTR protein**, leading to impaired chloride transport in epithelial cells.
- This defect results in abnormally high salt content in sweat, making the **sweat chloride test** the gold standard for diagnosis.
*Phenylketonuria*
- **Phenylketonuria (PKU)** is a metabolic disorder involving the inability to metabolize **phenylalanine**, leading to its accumulation in the blood.
- Diagnosis is typically made via **newborn screening** using blood tests, not sweat chloride levels.
*Gaucher's disease*
- **Gaucher's disease** is a lysosomal storage disorder caused by a deficiency in the enzyme **beta-glucosidase**, leading to lipid accumulation.
- Diagnosis involves enzyme assays from blood or tissue samples, or genetic testing, not sweat chloride analysis.
*Osteogenesis imperfecta*
- **Osteogenesis imperfecta** is a genetic disorder of **collagen synthesis**, primarily characterized by bone fragility, blue sclerae, and hearing loss.
- Diagnosis is based on clinical features, imaging, and genetic testing, with no relevance to sweat chloride levels.
*Tay-Sachs disease*
- **Tay-Sachs disease** is a lysosomal storage disorder caused by deficiency of **hexosaminidase A**, leading to accumulation of GM2 ganglioside in neurons.
- Diagnosis is made through **enzyme assay** or **genetic testing**, not sweat chloride measurement.
Bronchiectasis and Cystic Fibrosis Indian Medical PG Question 6: Which of the following is not typically associated with cystic fibrosis?
- A. Infertility
- B. Azoospermia
- C. Nasal polyps
- D. Renal failure (Correct Answer)
Bronchiectasis and Cystic Fibrosis Explanation: ***Renal failure***
- **Renal failure** is not a typical manifestation or complication of **cystic fibrosis (CF)**. The CFTR protein primarily affects epithelial cells in organs like the lungs, pancreas, liver, and intestines, not the kidneys.
- While CF patients may experience **electrolyte imbalances** due to excessive salt loss, this rarely progresses to **kidney failure** as a direct result of the disease itself.
*Infertility*
- **Infertility** is commonly associated with CF, particularly in males due to **congenital bilateral absence of the vas deferens (CBAVD)**, which is found in over 95% of male CF patients [1].
- In females, CF can cause **viscous cervical mucus** and nutritional deficiencies, leading to challenges with conception [1].
*Azoospermia*
- **Azoospermia**, specifically **obstructive azoospermia**, is a direct consequence of **congenital bilateral absence of the vas deferens (CBAVD)**, which is highly prevalent in male CF patients [1].
- This condition prevents sperm from reaching the ejaculate, despite normal sperm production in the testes.
*Nasal polyps*
- **Nasal polyps** are a common feature in patients with **cystic fibrosis**, often leading to **chronic rhinosinusitis** and nasal obstruction.
- This is due to the dysfunctional CFTR protein leading to abnormal mucus production and inflammation in the nasal passages [1].
Bronchiectasis and Cystic Fibrosis Indian Medical PG Question 7: A 3-year-old child is evaluated by a pediatrician for poor growth despite excessive food intake. The mother reports that the child's stools are bulky, foul-smelling, and difficult to flush because they float. Determination of which of the following would most likely be diagnostic in this case?
- A. Na+ in cerebrospinal fluid
- B. Na+ in urine
- C. Na+ in sweat (Correct Answer)
- D. Na+ in serum
Bronchiectasis and Cystic Fibrosis Explanation: ***Na+ in sweat***
- This clinical presentation of **poor growth despite excessive food intake** (due to malabsorption) and **bulky, foul-smelling, floating stools** (steatorrhea) is highly suggestive of **cystic fibrosis (CF)**.
- The **sweat test** is the diagnostic gold standard for CF. While the test measures both Na+ and Cl- in sweat, the **diagnostic criterion is based primarily on elevated chloride concentration** (Cl- ≥60 mmol/L). In CF, both sodium and chloride are elevated due to defective CFTR channel function.
- This patient's symptoms of malabsorption result from **pancreatic insufficiency**, a common manifestation of CF.
*Na+ in cerebrospinal fluid*
- Measuring Na+ in cerebrospinal fluid is typically done to evaluate neurological conditions or electrolyte imbalances affecting the **central nervous system**, which is not indicated here.
- There is no direct link between CSF Na+ levels and the malabsorption or growth failure described in this case.
*Na+ in urine*
- Urinary Na+ levels are used to assess **renal function** and overall **fluid and electrolyte balance**, and are relevant in conditions like **dehydration**, **kidney disease**, or **adrenal disorders**.
- These tests are not primary diagnostic tools for the gastrointestinal and growth issues described, which point more towards a malabsorption syndrome.
*Na+ in serum*
- Serum Na+ levels reflect the body's overall **hydration status** and are crucial for diagnosing **hyponatremia** or **hypernatremia**.
- While important for general medical assessment, serum Na+ levels do not specifically diagnose the underlying cause of malabsorption and steatorrhea seen in this child.
Bronchiectasis and Cystic Fibrosis Indian Medical PG Question 8: Investigation of choice in bronchiectasis?
- A. Bronchoscopy
- B. Chest X-ray
- C. MRI
- D. HRCT (Correct Answer)
Bronchiectasis and Cystic Fibrosis Explanation: ***HRCT***
- **High-resolution computed tomography (HRCT)** is the gold standard for diagnosing bronchiectasis, as it provides detailed images of the bronchial tree.
- It effectively visualizes the characteristic **bronchial dilation**, **lack of bronchial tapering**, and **"signet-ring" appearance** of the airways.
*MRI*
- **Magnetic resonance imaging (MRI)** is generally not the primary imaging modality for bronchiectasis due to its lower spatial resolution compared to CT for lung parenchyma.
- While it can provide functional information, it is not as effective in visualizing the characteristic anatomical changes of bronchiectasis.
*Bronchoscopy*
- **Bronchoscopy** is an invasive procedure primarily used to identify the cause of bronchiectasis (e.g., foreign body, infection, endobronchial obstruction) or for therapeutic lavage.
- It is not the initial diagnostic investigation of choice for confirming the presence and extent of bronchiectasis itself.
*Chest X-ray*
- A **chest X-ray** may show non-specific findings such as increased bronchial wall opacity or tram-track lucencies, which are suggestive of bronchiectasis but not definitive.
- It lacks the sensitivity and specificity of HRCT to confirm the diagnosis and delineate the extent of the disease.
Bronchiectasis and Cystic Fibrosis Indian Medical PG Question 9: A patient presents with recurrent lung infections, and the chest X-ray provided shows a characteristic finding. What is the most likely diagnosis?
- A. Kartagener syndrome (Correct Answer)
- B. Cystic fibrosis
- C. DiGeorge syndrome
- D. Down syndrome
Bronchiectasis and Cystic Fibrosis Explanation: ***Kartagener syndrome***
- This syndrome is a subgroup of **primary ciliary dyskinesia** and is characterized by the triad of **situs inversus** (dextrocardia as seen on the chest X-ray), **chronic sinusitis**, and **bronchiectasis**.
- Recurrent lung infections are a common presentation due to impaired mucociliary clearance leading to bronchiectasis.
*Cystic fibrosis*
- While cystic fibrosis does present with **recurrent lung infections** and **bronchiectasis**, it is not typically associated with **situs inversus** or other malformations of organ placement.
- Diagnosis is usually supported by a **positive sweat chloride test** and genetic testing for CFTR mutations.
*DiGeorge syndrome*
- This syndrome is characterized by **T-cell immunodeficiency**, **hypocalcemia**, and **congenital heart defects**.
- Recurrent infections in DiGeorge syndrome are due to immunodeficiency, not primarily due to impaired ciliary function or situs inversus.
*Down syndrome*
- Down syndrome is a chromosomal disorder associated with intellectual disability, distinctive facial features, and an increased risk of several health problems, including **congenital heart disease** and **immune dysfunction**.
- Recurrent lung infections can occur due to weakened immune function or structural airway abnormalities, but it does not cause situs inversus or primary ciliary dyskinesia.
Bronchiectasis and Cystic Fibrosis Indian Medical PG Question 10: Post-tubercular bronchiectasis is most commonly seen with
- A. Pertussis
- B. Cystic fibrosis
- C. Kartagener syndrome
- D. Tuberculosis (Correct Answer)
Bronchiectasis and Cystic Fibrosis Explanation: ***Tuberculosis***
- **Tuberculosis (TB)**, particularly childhood TB, is a leading cause of post-infectious bronchiectasis, especially in regions with high TB prevalence [1].
- The inflammatory and destructive processes associated with TB infection in the lungs can lead to irreversible dilation and damage of the bronchi [1].
*Pertussis*
- While **pertussis** can cause severe respiratory inflammation and chronic cough, it is a less common cause of widespread, irreversible bronchiectasis compared to tuberculosis [1].
- The damage caused by pertussis is typically more acute and less likely to lead to long-term structural changes like those seen in post-tubercular bronchiectasis.
*Cystic fibrosis*
- **Cystic fibrosis** is a genetic disorder that causes thick, sticky mucus to build up in the lungs, leading to chronic infections and bronchiectasis [1].
- However, post-tubercular bronchiectasis refers specifically to bronchiectasis developing *after* a tuberculosis infection, not as a primary genetic condition.
*Kartagener syndrome*
- **Kartagener syndrome** is a genetic disorder characterized by defects in ciliary function, leading to impaired mucociliary clearance and recurrent respiratory infections, which can result in bronchiectasis [1].
- Similar to cystic fibrosis, this is a primary genetic cause of bronchiectasis, distinct from bronchiectasis occurring as a sequela of tuberculosis.
More Bronchiectasis and Cystic Fibrosis Indian Medical PG questions available in the OnCourse app. Practice MCQs, flashcards, and get detailed explanations.
