Cardiology Practice Questions

Q: A 40-year-old male, a chronic smoker, presents with acute epigastric discomfort for the past hour. ECG shows ST segment elevation in the inferior leads. What is the immediate intervention?

Aspirin. **Explanation:** The clinical presentation of acute epigastric discomfort in a middle-aged smoker, combined with ST-elevation in inferior leads (II, III, aVF), is diagnostic of an **Acute Inferior Wall Myocardial Infarction (STEMI)** [1]. In any suspected Acute Coronary Syndrome (ACS), the **immediate first step** in management is the administration of antiplatelet therapy, specifically **Aspirin**. * **Why Aspirin is Correct:** Aspirin (300 mg chewed) is the most critical initial intervention. It inhibits cyclooxygenase-1 (COX-1), preventing the formation of Thromboxane A2, thereby inhibiting further platelet aggregation and thrombus propagation. It has been shown to significantly reduce mortality in the acute phase of MI. **Analysis of Incorrect Options:** * **Thrombolytic therapy (B):** While reperfusion (Primary PCI or Thrombolysis) is the definitive treatment for STEMI, it is initiated *after* the administration of loading doses of antiplatelets (Aspirin + P2Y12 inhibitor). * **IV Pantoprazole (C):** Epigastric pain is a common "anginal equivalent," especially in inferior wall MI due to diaphragmatic irritation [1]. Treating it as a gastric issue (GERD/Gastritis) is a common clinical pitfall that delays life-saving cardiac care. * **Beta blockers (D):** While used in MI, they are not the "immediate" first step. They must be avoided if there is bradycardia or heart block (common in inferior MI) or signs of heart failure [2]. **NEET-PG High-Yield Pearls:** 1. **Inferior MI & Right Ventricle:** Always check V4R (right-sided leads) in inferior MI. If RV infarction is present, **Nitrates are contraindicated** as they cause severe hypotension. 2. **Mnemonic for ACS:** "MONA" (Morphine, Oxygen, Nitrates, Aspirin), but **Aspirin** is the one that consistently reduces mortality. 3. **Door-to-Needle time:** 30 minutes (for thrombolysis); **Door-to-Balloon time:** 90 minutes (for PCI).

Q: Regarding S3 heart sound, all are true except?

S3 is heard in acute mitral regurgitation. The **S3 heart sound (Ventricular Gallop)** occurs during the phase of rapid ventricular filling in early diastole. It is caused by the sudden deceleration of blood flow as it strikes a compliant or dilated ventricular wall. ### **Explanation of Options** * **Option C (Correct Answer):** In **Acute Mitral Regurgitation (MR)**, the left atrium and ventricle are non-compliant (stiff) because they haven't had time to adapt to the sudden volume overload. This leads to a rapid rise in pressure, often resulting in an **S4 heart sound** (atrial gallop) rather than an S3. S3 is typically a hallmark of **Chronic MR**, where the ventricle is dilated and compliant. * **Option A:** S3 can be **physiological** in children, young adults (under 40), and during pregnancy due to a hyperdynamic circulation. * **Option B:** The sound is produced during the **early diastolic filling phase** (specifically the rapid filling phase), occurring just after S2. * **Option C:** S3 is characteristically seen in conditions with **increased preload** or volume overload, such as Congestive Heart Failure (CHF), Chronic MR, and Dilated Cardiomyopathy. ### **NEET-PG High-Yield Pearls** * **Best heard with:** The **Bell** of the stethoscope at the apex (left lateral decubitus position). * **The "Kentucky" Gallop:** S1-S2-S3 rhythm. * **Pathological S3:** In older adults, it is the most specific sign of **Left Ventricular Failure**. * **S3 vs. S4:** S3 = Volume Overload (Dilated heart); S4 = Pressure Overload/Stiffness (Hypertrophied heart, e.g., AS, Hypertension, Acute MI).

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: 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.

Question 1

A 40-year-old male, a chronic smoker, presents with acute epigastric discomfort for the past hour. ECG shows ST segment elevation in the inferior leads. What is the immediate intervention?

Accepted Answer

Aspirin

Answer

Thrombolytic therapy

Answer

IV pantoprazole

Answer

Beta blockers

Question 2

Regarding S3 heart sound, all are true except?

Accepted Answer

S3 is heard in acute mitral regurgitation

Answer

May be physiological

Answer

Due to early diastolic filling of ventricles

Answer

Seen in conditions associated with increased preload

Question 3

Subaortic stenosis is not associated with which of the following conditions?

Accepted Answer

Aortic regurgitation

Answer

Ventricular septal defect

Answer

Patent ductus arteriosus

Answer

Coarctation of the aorta

Question 4

Which of the following is NOT a predisposing factor for coronary artery disease?

Accepted Answer

Lipoprotein(a)

Answer

Homocysteinemia

Answer

Fibrinogen

Answer

Plasminogen activator inhibitors 1

Question 5

Bacterial endocarditis can cause all of the following except:

Accepted Answer

Subcutaneous nodules

Answer

Cerebral infarct

Answer

Focal glomerulonephritis

Answer

Meningitis

Question 6

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 7

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 8

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 9

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 10

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

Cardiology — MCQs

Cardiology — MCQs

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