Internal Medicine
7 questionsWhat condition is associated with Lemierre's syndrome?
Absent P Wave is seen on an ECG in:
Torsades de pointes is seen in all except
Which of the following statements is true regarding the diagnostic criteria for Chronic Obstructive Pulmonary Disease (COPD)?
In which condition is Cepacia syndrome most commonly associated?
What is the most common cause of lobar consolidation?
Which of the following is not a clinical feature of Bronchiectasis?
NEET-PG 2013 - Internal Medicine NEET-PG Practice Questions and MCQs
Question 1111: What condition is associated with Lemierre's syndrome?
- A. Carotid sinus aneurysm
- B. Traumatic occlusion of IJV
- C. Any of the above
- D. Thrombophlebitis of IJV (Correct Answer)
Explanation: ***Thrombophlebitis of IJV*** - **Lemierre's syndrome** is classically defined as **septic thrombophlebitis of the internal jugular vein (IJV)** following an oropharyngeal infection [1]. - The infection, most commonly caused by *Fusobacterium necrophorum*, spreads from the pharynx to the parapharyngeal space, leading to IJV inflammation and thrombosis [1]. *Carotid sinus aneurysm* - A **carotid sinus aneurysm** is an abnormal focal dilation of the carotid sinus, often associated with atherosclerosis or connective tissue disorders. - It is not directly linked to the pathogenesis or complications of **Lemierre's syndrome**. *Traumatic occlusion of IJV* - **Traumatic occlusion of the IJV** results from direct injury to the neck, leading to vessel compression or damage. - While it affects the IJV, it does not involve the septic thrombophlebitis or preceding oropharyngeal infection characteristic of **Lemierre's syndrome**. *Any of the above* - This option is incorrect because **Lemierre's syndrome** is specifically associated with **septic thrombophlebitis of the IJV**, not with other unrelated vascular conditions affecting the neck.
Question 1112: Absent P Wave is seen on an ECG in:
- A. Cor Pulmonale
- B. Mitral Stenosis
- C. Chronic Obstructive Pulmonary Disease (COPD)
- D. Atrial Fibrillation (AF) (Correct Answer)
Explanation: ***Atrial Fibrillation (AF)*** - In **atrial fibrillation**, the atria beat chaotically and irregularly, leading to the absence of coordinated **atrial depolarization**, thus no distinct P wave is seen [1]. - The ECG characteristically shows an **irregularly irregular rhythm** with narrow QRS complexes and no discernible P waves. *Cor Pulmonale* - Cor pulmonale involves right ventricular hypertrophy and dilation due to lung disease, which can cause peaked **P waves (P pulmonale)** in leads II, III, aVF, indicating right atrial enlargement. - It does not typically lead to the absence of P waves but rather changes in their morphology. *Mitral Stenosis* - **Mitral stenosis** can cause left atrial enlargement, which typically manifests as a broad, notched **P wave (P mitrale)**, especially in lead II, and a prominent negative phase in V1. - P waves are present but altered in appearance due to the increased atrial pressure and volume. *Chronic Obstructive Pulmonary Disease (COPD)* - Patients with **COPD** often show signs of right atrial enlargement, similar to cor pulmonale, resulting in **P pulmonale** on the ECG due to increased pulmonary pressures. - While other ECG changes like low voltage and right axis deviation may be present, the P wave is generally present, though often peaked.
Question 1113: Torsades de pointes is seen in all except
- A. Hyponatremia (Correct Answer)
- B. Hypomagnesemia
- C. Hypokalemia
- D. Hypocalcemia
Explanation: ***Hyponatremia*** - **Hyponatremia** (low sodium levels) primarily affects neuronal function and can lead to neurological symptoms like seizures and altered mental status [1]. - It does not directly cause **QT prolongation** or **Torsades de Pointes (TdP)**, which are typically associated with electrolyte imbalances affecting cardiac repolarization. *Hypocalcemia* - **Hypocalcemia** (low calcium levels) can prolong the **QT interval** on an electrocardiogram. - Prolongation of the QT interval increases the risk of developing **Torsades de Pointes**, a life-threatening polymorphic ventricular tachycardia [2]. *Hypomagnesemia* - **Hypomagnesemia** (low magnesium levels) is a common cause and aggravator of **Torsades de Pointes**. - Magnesium plays a crucial role in cardiac ion channel function, and its deficiency can lead to significant **QT prolongation** and ventricular arrhythmias. *Hypokalemia* - **Hypokalemia** (low potassium levels) can prolong the **QT interval** and increase the risk of developing ventricular arrhythmias, including **Torsades de Pointes** [1]. - Potassium channels are essential for cardiac repolarization, and their dysfunction due to low potassium can destabilize myocardial electrical activity [1].
Question 1114: Which of the following statements is true regarding the diagnostic criteria for Chronic Obstructive Pulmonary Disease (COPD)?
- A. A post-bronchodilator FEV1/FVC ratio above the threshold indicates normal lung function.
- B. A post-bronchodilator FEV1/FVC ratio below the threshold indicates airflow limitation. (Correct Answer)
- C. Residual Volume (RV) is normal.
- D. Total Lung Capacity (TLC) is decreased.
Explanation: ***A post-bronchodilator FEV1/FVC ratio below the threshold indicates airflow limitation.*** [1] - This is the **hallmark diagnostic criterion** for COPD, confirming persistent **airflow obstruction** that is not fully reversible. [1] - The threshold typically used is **< 0.70** or below the **fifth percentile** of the lower limit of normal (LLN). *A post-bronchodilator FEV1/FVC ratio above the threshold indicates normal lung function.* - An FEV1/FVC ratio **above the threshold** indicates the absence of significant **airflow obstruction**, but does not automatically guarantee normal lung function as other parameters like **FEV1** could be affected. - This measurement would suggest a **restrictive lung disease** or **normal lung function**, depending on other spirometry values. *Residual Volume (RV) is normal.* - In COPD, **air trapping** due to airflow obstruction leads to an **increased Residual Volume (RV)**, not a normal RV. - An elevated RV reflects **hyperinflation** of the lungs, a characteristic feature of emphysema and chronic bronchitis. *Total Lung Capacity (TLC) is decreased.* - COPD is characterized by **hyperinflation**, which typically results in an **increased Total Lung Capacity (TLC)** as the lungs become more distended. - A **decreased TLC** would be indicative of a **restrictive lung disease**, which is different from obstructive patterns seen in COPD.
Question 1115: In which condition is Cepacia syndrome most commonly associated?
- A. Immotile cilia syndrome
- B. Sarcoidosis
- C. Cystic fibrosis (Correct Answer)
- D. Tuberculosis
Explanation: ***Cystic fibrosis*** - **Cepacia syndrome** is a severe and often fatal complication in patients with **cystic fibrosis** caused by infection with bacteria of the *Burkholderia cepacia complex*. - Patients with cystic fibrosis have impaired mucociliary clearance, making them highly susceptible to chronic bacterial infections, including those leading to Cepacia syndrome. *Sarcoidosis* - **Sarcoidosis** is a multisystem inflammatory disease characterized by the formation of **non-caseating granulomas**, primarily affecting the lungs and lymph nodes. - It is not associated with bacterial infections causing Cepacia syndrome. *Tuberculosis* - **Tuberculosis** is caused by *Mycobacterium tuberculosis* and primarily affects the lungs, leading to granuloma formation and tissue destruction. - While it is a chronic bacterial infection, it does not typically lead to or interact with the *Burkholderia cepacia complex* in the way seen in Cepacia syndrome. *Immotile cilia syndrome* - Also known as **primary ciliary dyskinesia**, this condition involves defective ciliary function leading to recurrent respiratory infections and other issues like situs inversus. - Although patients have recurrent respiratory infections, **Cepacia syndrome** is not a characteristic or commonly associated complication.
Question 1116: What is the most common cause of lobar consolidation?
- A. Mycoplasma
- B. Chlamydia
- C. Streptococcus (Correct Answer)
- D. Legionella
Explanation: ***Streptococcus*** - **_Streptococcus pneumoniae_** is the **most common bacterial cause** of community-acquired pneumonia, frequently leading to lobar consolidation. [1] - It often presents with classic symptoms such as **sudden onset of fever**, productive cough with **rusty sputum**, and pleuritic chest pain. [1] *Mycoplasma* - **_Mycoplasma pneumoniae_** typically causes **"walking pneumonia"**, characterized by a more indolent course and often presents with **interstitial infiltrates** rather than dense lobar consolidation. - Though common, it is a less frequent cause of true lobar consolidation compared to _Streptococcus pneumoniae_. *Chlamydia* - **_Chlamydia pneumoniae_** causes atypical pneumonia, similar to _Mycoplasma_, presenting with less severe symptoms and **patchy infiltrates** or **interstitial patterns** rather than lobar consolidation. - It is a common cause of **atypical pneumonia** but not the leading cause of lobar consolidation. *Legionella* - **_Legionella pneumophila_** can cause severe pneumonia with consolidation, but it is **less common overall** than pneumococcal pneumonia. [1] - **Legionnaires' disease** is often associated with exposure to contaminated water sources and may present with **gastrointestinal and neurological symptoms** in addition to respiratory manifestations.
Question 1117: Which of the following is not a clinical feature of Bronchiectasis?
- A. Hemoptysis
- B. Chest pain
- C. Night sweats (Correct Answer)
- D. Productive cough
Explanation: ***Night sweats*** - While **night sweats** can be present in chronic infections, they are not considered a primary or defining clinical feature directly associated with the pathology of bronchiectasis itself. - They are more commonly linked with systemic conditions like **tuberculosis** or malignancy, which would require alternative diagnostic pathways. *Hemoptysis* - **Hemoptysis** (coughing up blood) is a common and often alarming symptom of bronchiectasis due to the inflammation and damage to the bronchial walls and underlying vasculature [1]. - Blood vessels in damaged airways are prone to rupture, leading to bleeding, which can range from blood-streaked sputum to massive hemorrhage [1]. *Chest pain* - **Chest pain** can occur in bronchiectasis, often related to the chronic cough, pleural inflammation, or musculoskeletal strain from persistent coughing. - It can also be a symptom if there's an associated infection or inflammation extending to the pleura. *Productive cough* - A **chronic productive cough** with significant amounts of purulent sputum is the hallmark symptom of bronchiectasis [1]. - This is due to the impaired mucociliary clearance and chronic infection within the dilated, damaged airways .
Microbiology
1 questionsEmpyema thoracis is most commonly caused by which organism
NEET-PG 2013 - Microbiology NEET-PG Practice Questions and MCQs
Question 1111: Empyema thoracis is most commonly caused by which organism
- A. Streptococcus pneumoniae (Correct Answer)
- B. Pseudomonas
- C. Staphylococcus aureus
- D. Mycobacterium
Explanation: ***Streptococcus pneumoniae*** - This is the **most common cause of empyema thoracis**, accounting for **40-70% of all cases** in most published series - It is the leading cause of **community-acquired pneumonia** that progresses to parapneumonic effusion and empyema - The pneumococcal infection leads to **inflammatory exudation** into the pleural space, which can progress through exudative, fibrinopurulent, and organizing phases to form frank empyema - Remains the most frequent causative organism across all age groups in community-acquired empyema *Staphylococcus aureus* - An important but **less common cause** of empyema, accounting for approximately 10-20% of cases - More frequently seen in **specific clinical contexts**: post-influenza pneumonia, hospital-acquired infections, hematogenous spread, and pediatric empyema - Causes **severe, necrotizing infections** with abscess formation and is associated with higher morbidity - While clinically significant, it is **not the most common** overall cause *Pseudomonas* - *Pseudomonas aeruginosa* is primarily associated with **nosocomial empyema** in hospitalized patients - Risk factors include **ventilator-associated pneumonia**, immunosuppression, and **cystic fibrosis** - Accounts for a small percentage of empyema cases overall *Mycobacterium* - *Mycobacterium tuberculosis* causes **tuberculous empyema**, a chronic condition with characteristic **thick pleural fluid** and caseous material - Important in regions with high TB prevalence but represents a distinct entity from acute bacterial empyema - Not a common cause of acute pyogenic empyema in most settings
Physiology
1 questionsWhich of the following is markedly decreased in restrictive lung disease?
NEET-PG 2013 - Physiology NEET-PG Practice Questions and MCQs
Question 1111: Which of the following is markedly decreased in restrictive lung disease?
- A. FVC (Correct Answer)
- B. RV
- C. FEV1/FVC
- D. FEV1
Explanation: ***FVC*** - In **restrictive lung disease**, there is a reduction in lung volume due to various causes, leading to a markedly decreased **Forced Vital Capacity (FVC)**. - **FVC** directly measures the total amount of air a person can exhale after a maximal inhalation, which is inherently limited in restrictive conditions. - This is the **hallmark finding** in restrictive lung disease and the most clinically significant decrease. *FEV1* - While **FEV1** (Forced Expiratory Volume in 1 second) is also decreased in restrictive lung disease, its decrease is proportional to the FVC decrease. - A decrease in FEV1 alone is less specific, as it could also indicate obstructive lung disease. - The key is that both FEV1 and FVC decrease together, maintaining a normal or increased ratio. *FEV1/FVC* - The **FEV1/FVC ratio** is typically **normal or even increased** in restrictive lung disease, as both FEV1 and FVC decrease proportionally or FEV1 decreases slightly less. - A decreased FEV1/FVC ratio is characteristic of **obstructive lung disease**, not restrictive. *RV* - **Residual Volume (RV)** is also **decreased** in restrictive lung disease, along with all other lung volumes (TLC, VC, FRC). - However, RV is not measured by standard spirometry and requires body plethysmography or gas dilution techniques. - While RV does decrease, **FVC** is the more clinically significant and readily measurable parameter that is "markedly decreased" and defines restrictive disease on routine pulmonary function testing.
Radiology
1 questionsA chest X-ray shows bilateral lung infiltrates. What is the next best investigation?
NEET-PG 2013 - Radiology NEET-PG Practice Questions and MCQs
Question 1111: A chest X-ray shows bilateral lung infiltrates. What is the next best investigation?
- A. Sputum examination
- B. CT (Correct Answer)
- C. Bronchoscopy
- D. Echocardiography
Explanation: ***CT*** - A **CT scan (preferably HRCT)** provides a more detailed view of the lung parenchyma, allowing for better characterization of the infiltrates (e.g., location, pattern, presence of nodules, ground-glass opacities, or consolidation). - This detailed imagery is crucial for narrowing down the differential diagnosis and guiding further diagnostic or therapeutic interventions. - **CT is the best next investigation** for characterizing bilateral lung infiltrates seen on chest X-ray. *Sputum examination* - While important for identifying infectious causes, **sputum examination** is often only productive in certain types of pneumonia or infections and might not directly clarify the morphology or distribution of the infiltrates as a CT scan would. - It might be a subsequent step once the nature of the infiltrate is better understood through imaging. *Bronchoscopy* - **Bronchoscopy** is an invasive procedure generally reserved for cases where less invasive methods have failed to yield a diagnosis or when specific findings from imaging (like a CT scan) suggest the need for direct visualization, lavage, or biopsy. - It's not typically the immediate next step after identifying bilateral infiltrates on a chest X-ray. *Echocardiography* - **Echocardiography** is useful for evaluating cardiac causes of bilateral infiltrates (such as pulmonary edema from heart failure). - However, it does not directly visualize or characterize the lung parenchymal infiltrates themselves, making CT more valuable as the next investigation.