Cardiology Practice Questions

Q: Bacterial endocarditis can cause all of the following except:

Subcutaneous nodules. **Explanation:** In Infective Endocarditis (IE), clinical manifestations arise from four mechanisms: continuous bacteremia, valvular destruction, septic embolization, and circulating immune complexes [1]. **Why "Subcutaneous nodules" is the correct answer:** Subcutaneous nodules are characteristic of **Acute Rheumatic Fever** (Jones Criteria), not IE [2]. In IE, the classic skin findings are **Osler nodes** (tender, pea-sized nodules on finger/toe pads due to immune complex deposition) and **Janeway lesions** (non-tender, erythematous macules on palms/soles due to septic emboli). While both involve the skin, "subcutaneous nodules" is a specific clinical term reserved for Rheumatic Fever. **Analysis of incorrect options:** * **Cerebral Infarct:** This is the most common CNS complication of IE, occurring when vegetative fragments break off (septic emboli) and occlude cerebral arteries [1], [3]. * **Focal Glomerulonephritis:** IE often triggers an immune-mediated response. Deposition of antigen-antibody complexes in the kidney leads to "flea-bitten kidney" appearance, clinically manifesting as focal or diffuse glomerulonephritis and hematuria [1]. * **Meningitis:** Continuous bacteremia or septic emboli can seed the meninges, leading to purulent or aseptic meningitis. **NEET-PG High-Yield Pearls:** * **Most common cause (Native Valve):** *Staphylococcus aureus* (Acute), *Viridans streptococci* (Subacute) [4]. * **Most common cause (IV Drug Users):** *Staphylococcus aureus* (Tricuspid valve involvement) [4]. * **Roth Spots:** Retinal hemorrhages with central clearing (Immune-mediated). * **Duke’s Criteria:** The gold standard for diagnosis (Major: Positive blood cultures and Echo evidence) [3].

Q: Which of the following can cause a soft first heart sound (S1)?

All of the above. ### Explanation The **first heart sound (S1)** is primarily produced by the closure of the atrioventricular (AV) valves—the Mitral (M1) and Tricuspid (T1) valves—at the onset of ventricular systole. The intensity of S1 depends on the mobility of the leaflets, the distance they travel to close, and the rate of ventricular pressure rise. **Why "All of the Above" is Correct:** * **Long-standing severe Mitral Stenosis (MS):** While early MS typically presents with a *loud* S1 (due to high atrial pressure keeping leaflets wide apart) [1], **long-standing severe MS** leads to heavy calcification and fibrosis of the leaflets. This rigidity prevents them from vibrating or snapping shut effectively, resulting in a soft or muffled S1 [3]. * **Obesity:** This is an "extracardiac" cause. Increased chest wall thickness acts as an acoustic dampener, reducing the transmission of sound from the heart to the stethoscope, thereby softening all heart sounds, including S1. * **Mitral Regurgitation (MR):** In chronic MR, the mitral leaflets often fail to coapt properly or are structurally damaged [2]. Additionally, the rate of pressure rise ($dP/dt$) may be altered, and the lack of a "tight seal" during closure leads to a diminished S1. **High-Yield Clinical Pearls for NEET-PG:** 1. **Loud S1:** Seen in **Short PR interval** (leaflets are wide open at the start of systole), **Mild-to-Moderate MS** (pliable leaflets) [1], and **Hyperdynamic states** (tachycardia, exercise, anemia). 2. **Soft S1:** Seen in **Long PR interval (1st-degree heart block)** (leaflets float back together before systole), **Severe Calcific MS** [3], **MR**, and **Reduced myocardial contractility** (e.g., Heart Failure, Acute MI). 3. **Variable S1:** A classic sign of **Atrial Fibrillation** and **Complete Heart Block** (AV dissociation). 4. **Lungs:** Emphysema/COPD also cause a soft S1 due to increased air between the heart and the chest wall.

Q: A patient post myocardial infarction develops atrial fibrillation. Subsequently, echocardiography shows a mural thrombus. What is the recommended management?

Warfarin. **Explanation:** The development of **Atrial Fibrillation (AF)** and a **mural thrombus** following a Myocardial Infarction (MI) significantly increases the risk of systemic thromboembolism (e.g., ischemic stroke). The primary goal of management in this scenario is systemic anticoagulation. **Why Warfarin is correct:** In the setting of a documented mural thrombus (usually occurring in the left ventricle post-anterior MI) [1] or AF, anticoagulation is mandatory to prevent embolization. **Warfarin** (Vitamin K Antagonist) is the traditional choice for long-term anticoagulation in these patients [2]. Current guidelines recommend anticoagulation for 3–6 months for mural thrombi to allow for thrombus resolution and endothelialization. **Why other options are incorrect:** * **Cardioversion:** While rhythm control is a strategy for AF, performing cardioversion in a patient with a known thrombus is contraindicated without prior therapeutic anticoagulation, as it may dislodge the clot and cause a stroke. * **Digoxin:** This is a rate-control agent. While it may be used for AF, it does not address the life-threatening risk of the mural thrombus. * **Propranolol:** This is a beta-blocker used for rate control and post-MI mortality benefit. However, like Digoxin, it has no effect on the thrombus itself. **High-Yield Clinical Pearls for NEET-PG:** * **Mural Thrombus:** Most common after a large **Anterior Wall MI** involving the apex [1]. * **Diagnosis:** Transthoracic Echocardiography (TTE) is the initial test; Cardiac MRI is the gold standard for detection [1]. * **Triple Therapy:** Patients post-MI with a stent who also require Warfarin (for AF/thrombus) are often put on "triple therapy" (Aspirin + Clopidogrel + Anticoagulant), though the duration is kept short to minimize bleeding risk. * **DOACs:** While Warfarin is the classic answer, newer guidelines also consider Direct Oral Anticoagulants (DOACs) as alternatives for LV thrombi.

Q: Constrictive pericarditis is associated with each of the following except?

Hypothyroidism. **Explanation:** **Constrictive Pericarditis (CP)** is the result of chronic inflammation leading to a thickened, fibrotic, and often calcified pericardium that restricts diastolic filling [1]. **Why Hypothyroidism is the Correct Answer:** Hypothyroidism is typically associated with **Pericardial Effusion** (often "gold-paint" appearance due to high cholesterol content), but it does **not** cause the chronic fibrosis or scarring required to produce Constrictive Pericarditis. While the effusion can rarely lead to tamponade, it does not progress to constriction. **Analysis of Incorrect Options:** * **Tuberculosis (B):** Historically and globally, TB remains the **most common cause** of constrictive pericarditis, especially in developing countries like India [1]. It causes a "cold" chronic inflammation that leads to heavy calcification [1]. * **Radiation Therapy (A):** Mediastinal radiation (commonly for Hodgkin’s lymphoma or breast cancer) is a major cause of CP in developed nations. It triggers progressive pericardial fibrosis years after exposure. * **Bacterial/Purulent Pericarditis (C):** Acute pyogenic infections (e.g., Staphylococcal or Pneumococcal) can lead to rapid thickening and organization of the pericardium, resulting in "subacute" constriction. **NEET-PG High-Yield Pearls:** 1. **Clinical Sign:** Look for **Kussmaul’s Sign** (paradoxical rise in JVP during inspiration) and a **Pericardial Knock** (early diastolic sound). 2. **Imaging:** Chest X-ray may show a "rim of calcification" around the heart. CT/MRI showing pericardial thickness **>3mm** is diagnostic. 3. **Hemodynamics:** Characterized by the **"Square Root Sign"** (dip-and-plateau) on ventricular pressure tracings. 4. **Treatment:** The definitive treatment is **Surgical Pericardiectomy** [1].

Q: All are true about hypertrophic obstructive cardiomyopathy except?

Anterior leaflet movement is delayed. Explanation: Hypertrophic Obstructive Cardiomyopathy (HOCM) is a genetic disorder characterized by primary myocardial hypertrophy, typically involving the interventricular septum [1]. Why Option C is the correct answer (The "Except"): In HOCM, the hallmark echocardiographic finding is **Systolic Anterior Motion (SAM)** of the mitral valve. This movement is **not delayed**; rather, it occurs **early in systole**. As blood is ejected through a narrowed outflow tract at high velocity (Venturi effect), the anterior leaflet of the mitral valve is "sucked" toward the hypertrophied septum. This leads to Left Ventricular Outflow Tract (LVOT) obstruction and concomitant mitral regurgitation. Analysis of other options: * **Option A:** Asymmetrical Septal Hypertrophy (ASH) is the classic anatomical feature, where the septum is significantly thicker than the posterior wall (Ratio >1.3:1). * **Option B:** HOCM is primarily a disease of **diastolic dysfunction** (impaired relaxation). Systolic function (Ejection Fraction) is typically preserved or even supranormal until the very end stages of the disease. * **Option D:** Due to the dynamic LVOT obstruction and impaired diastolic filling, the stroke volume and subsequent cardiac output are often diminished, especially during exertion [1]. High-Yield Clinical Pearls for NEET-PG: * **Murmur Dynamics:** The harsh systolic murmur of HOCM **increases** with maneuvers that decrease preload (Valsalva, Standing) and **decreases** with maneuvers that increase preload or afterload (Squatting, Handgrip). * **ECG Findings:** Look for "Dagger-like" Q waves in lateral leads (I, aVL, V5-V6). * **Histology:** Characterized by **myocyte disarray** [1]. * **Drug of Choice:** Beta-blockers (to improve diastolic filling time); avoid Nitrates and Diuretics as they worsen the obstruction.

Q: The following ECG represents?

P mitrale. ***P mitrale*** - Characterized by **broad, notched or bifid P waves** (>0.12 seconds) in lead II, indicating **left atrial enlargement**. - The **bifid appearance** results from delayed activation of the enlarged left atrium, creating the characteristic "M-shaped" P wave. *Rabbit ear pattern* - This refers to the **RSR' pattern** seen in **right bundle branch block (RBBB)** in leads V1-V2. - It involves **QRS complexes**, not P waves, and appears as two distinct peaks resembling rabbit ears. *Delta wave* - A **slurred upstroke** of the QRS complex seen in **Wolff-Parkinson-White (WPW) syndrome**. - Results from **pre-excitation** via an accessory pathway, causing early ventricular depolarization, not P wave abnormalities. *P pulmonale* - Indicates **right atrial enlargement** with **tall, peaked P waves** (>2.5 mm) in leads II, III, and aVF. - Associated with conditions like **COPD** and **pulmonary hypertension**, appearing narrow and pointed rather than broad and notched.

Q: Comment on the diagnosis from the ECG shown below?

RCA occlusion by thrombus. ***RCA occlusion by thrombus*** - **ST elevation** in **inferior leads (II, III, aVF)** is the classic ECG pattern for **right coronary artery (RCA)** occlusion. - The RCA typically supplies the **inferior wall** of the left ventricle and often the **posterior wall**, making this the most likely culprit vessel. *LAD occlusion by thrombus* - LAD occlusion would show **ST elevation** in **anterior leads (V1-V6)** and possibly **lead I and aVL**. - This pattern represents **anterior wall MI**, not the inferior wall changes seen in this ECG. *LCX occlusion by thrombus* - LCX occlusion typically causes **ST elevation** in **lateral leads (I, aVL, V5-V6)** or **posterior changes**. - May show **reciprocal ST depression** in anterior leads rather than the inferior lead changes observed. *Infarct* - While technically correct that an infarct is occurring, this option lacks **anatomical specificity**. - Fails to identify the **culprit vessel** or **location of infarct**, which is crucial for **treatment planning** and **prognosis**.

Question 1

Bacterial endocarditis can cause all of the following except:

Accepted Answer

Subcutaneous nodules

Answer

Cerebral infarct

Answer

Focal glomerulonephritis

Answer

Meningitis

Question 2

Which of the following can cause a soft first heart sound (S1)?

Accepted Answer

All of the above

Answer

Long standing severe mitral stenosis

Answer

Obesity

Answer

Mitral regurgitation

Question 3

A patient post myocardial infarction develops atrial fibrillation. Subsequently, echocardiography shows a mural thrombus. What is the recommended management?

Accepted Answer

Warfarin

Answer

Cardioversion

Answer

Digoxin

Answer

Propranolol

Question 4

Constrictive pericarditis is associated with each of the following except?

Accepted Answer

Hypothyroidism

Answer

Radiation therapy for Hodgkin's disease

Answer

Tuberculosis

Answer

Bacterial (purulent) pericarditis

Question 5

All are true about hypertrophic obstructive cardiomyopathy except?

Accepted Answer

Anterior leaflet movement is delayed

Answer

Asymmetrical septal hypertrophy

Answer

Systolic ventricular dysfunction is absent

Answer

Cardiac output is diminished

Question 6

A patient with an atrial septal defect (ASD) presents with a murmur similar to mitral regurgitation and left axis deviation of 40 degrees. What is the likely diagnosis?

Accepted Answer

Floppy mitral valve

Answer

Transposition of the great arteries (TGA)

Answer

Ostium secundum

Answer

Ostium primum

Question 7

What is the most common cause of right ventricular failure?

Accepted Answer

Left ventricular failure

Answer

Cor pulmonale

Answer

Pulmonary involvement

Answer

Endomyocardial fibrosis

Question 8

What is Wenckebach phenomenon?

Accepted Answer

Progressive lengthening of the PR interval until a QRS complex is dropped

Answer

Slurred QRS complex

Answer

Irregular heart rate and premature ventricular beats

Answer

Shortened ST intervals

Question 9

The following ECG represents?

Accepted Answer

P mitrale

Answer

Rabbit ear pattern

Answer

Delta wave

Answer

P pulmonale

Question 10

Comment on the diagnosis from the ECG shown below?

Accepted Answer

RCA occlusion by thrombus

Answer

LAD occlusion by thrombus

Answer

LCX occlusion by thrombus

Answer

Infarct

Cardiology — MCQs

Cardiology — MCQs

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