Cardiology Practice Questions

Q: A patient of myocardial infarction dies within the first few hours of infarction due to which of the following complications?

Cardiac failure. The correct answer is **Cardiac Failure**. **1. Why Cardiac Failure is correct:** In the immediate aftermath of an acute myocardial infarction (MI), the sudden loss of a significant portion of the ventricular myocardium leads to impaired systolic and diastolic function. This results in **acute left ventricular failure** and cardiogenic shock [1]. According to standard medical literature (including Harrison’s Principles of Internal Medicine), while arrhythmias are common, **cardiac failure remains the most common cause of death in patients who reach the hospital** and the leading cause of in-hospital mortality following an MI [3]. **2. Why the other options are incorrect:** * **Ventricular Fibrillation (VF):** This is the most common cause of **pre-hospital** death (sudden cardiac death) within the first hour of an MI [2]. However, in a clinical or hospital setting, cardiac failure is statistically the leading cause of mortality. * **Atrial Fibrillation:** While common post-MI due to atrial ischemia or stretch [4], it is rarely a direct cause of death; it primarily complicates the clinical course by causing hemodynamic instability. * **Cardiac Tamponade:** This typically occurs due to **ventricular free wall rupture**, which is a mechanical complication that usually manifests **3 to 7 days** after the infarction, not within the first few hours [1]. **Clinical Pearls for NEET-PG:** * **Most common cause of death (Overall/Pre-hospital):** Ventricular Fibrillation [2]. * **Most common cause of death (In-hospital):** Cardiac Failure/Cardiogenic Shock [3]. * **Most common arrhythmia in MI:** Ventricular Premature Complexes (VPCs). * **Timeframe for Myocardial Rupture:** 3–7 days (due to macrophage-mediated wall weakening) [1].

Q: All of the following are cardiovascular complications of HIV infection, EXCEPT:

Aortic Aneurysm. The cardiovascular manifestations of HIV are diverse, primarily resulting from direct viral effects, opportunistic infections, or the metabolic side effects of Highly Active Antiretroviral Therapy (HAART). **Why Aortic Aneurysm is the Correct Answer:** While HIV is associated with various vasculitides and premature atherosclerosis (due to chronic inflammation and HAART), **Aortic Aneurysm** is not a classic or direct cardiovascular complication of HIV infection itself. In contrast, HIV-associated vasculopathy typically manifests as small to medium-vessel disease or accelerated coronary artery disease. **Analysis of Incorrect Options:** * **Cardiomyopathy:** HIV-associated cardiomyopathy (often Dilated Cardiomyopathy) is a well-documented complication. It can be caused by direct HIV invasion of myocytes, nutritional deficiencies (selenium), or myocarditis due to opportunistic pathogens like Coxsackievirus or CMV. * **Pericardial Effusion:** This is the **most common** cardiac manifestation of HIV. It is often asymptomatic but can be caused by opportunistic infections (e.g., *M. tuberculosis*, *Cryptococcus*), malignancy (Kaposi sarcoma), or "capillary leak syndrome" in advanced AIDS. * **Cardiac Tamponade:** While less common than simple effusion, pericardial effusions in HIV patients (especially those caused by Tuberculosis) can progress to life-threatening cardiac tamponade. **NEET-PG High-Yield Pearls:** 1. **Most common cardiac abnormality in HIV:** Pericardial Effusion. 2. **Most common cause of symptomatic heart failure in HIV:** Dilated Cardiomyopathy (DCM). 3. **Infective Endocarditis in HIV:** Usually associated with IV drug use (right-sided, *S. aureus*). 4. **HAART Impact:** Protease Inhibitors (PIs) are notorious for causing dyslipidemia and insulin resistance, leading to premature **Coronary Artery Disease (CAD)**.

Q: A 57-year-old woman presents to the hospital with a 2-hour history of retrosternal chest pain and dyspnea. Her electrocardiogram (ECG) reveals an acute myocardial infarction pattern. Which of the following ECG patterns is consistent with that interpretation?

elevated ST segments. **Explanation:** The clinical presentation of retrosternal chest pain and dyspnea in a 57-year-old is highly suggestive of **Acute Coronary Syndrome (ACS)** [4]. In the context of an acute myocardial infarction (MI), the ECG is the primary diagnostic tool used to differentiate between STEMI and NSTEMI [1]. **Why the correct answer is right:** * **Elevated ST segments:** This is the hallmark of a **STEMI (ST-Elevation Myocardial Infarction)** [1], [2]. It represents transmural myocardial ischemia and injury. The elevation occurs because the injured myocardium remains partially depolarized, creating a "current of injury" between the affected and healthy tissue during the TP and ST intervals. **Why the incorrect options are wrong:** * **Tall P waves (P-pulmonale):** These are typically seen in **Right Atrial Enlargement**, often due to chronic obstructive pulmonary disease (COPD) or pulmonary hypertension, not acute MI. * **Prominent U waves:** These are most commonly associated with **Hypokalemia**. They may also be seen in bradycardia or with certain drugs (e.g., Digoxin, Class IA antiarrhythmics). * **Small QRS complex (Low voltage):** This is characteristic of conditions that insulate the heart or reduce its muscle mass, such as **pericardial effusion**, obesity, emphysema, or restrictive cardiomyopathy (amyloidosis). **High-Yield Clinical Pearls for NEET-PG:** * **Evolution of STEMI on ECG:** Hyperacute T waves → ST elevation → Q waves (signifying necrosis) → T wave inversion [1]. * **Reciprocal Changes:** Look for ST depression in leads opposite to those showing ST elevation (e.g., ST elevation in II, III, aVF with reciprocal depression in I and aVL suggests an Inferior Wall MI) [1]. * **New Left Bundle Branch Block (LBBB):** In a patient with typical chest pain, a new-onset LBBB is considered a STEMI equivalent [3].

Q: Which of the following is NOT a high-risk factor for sudden cardiac death in hypertrophic cardiomyopathy?

Left ventricular septal thickness of 2-3 cm. In Hypertrophic Cardiomyopathy (HCM), identifying patients at risk for Sudden Cardiac Death (SCD) is crucial for determining the need for an Implantable Cardioverter Defibrillator (ICD) [1]. **Explanation of the Correct Answer:** **Option C** is the correct answer because the threshold for high risk is a maximal Left Ventricular Wall Thickness (LVWT) of **≥30 mm (3 cm)**. A thickness of 2-3 cm (20-29 mm) is considered moderate hypertrophy but does not meet the major risk criterion on its own. Extreme hypertrophy (≥30 mm) is a potent predictor of SCD, especially in younger patients. **Explanation of Incorrect Options:** * **Option A (Family History):** A history of SCD in one or more first-degree relatives (aged 20 mmHg or a drop in BP during exercise testing indicates hemodynamic instability and an inability to increase cardiac output, marking high risk [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Major Risk Factors for SCD in HCM:** 1. Prior cardiac arrest or sustained VT (Secondary prevention). 2. Family history of SCD. 3. Unexplained syncope (recent). 4. LV wall thickness ≥30 mm. 5. Abnormal exercise BP response. 6. NSVT on monitoring. * **HCM Murmur:** Increases with Valsalva and standing (decreased preload); decreases with squatting and handgrip. * **Management:** Beta-blockers are first-line; ICD is the only proven method to prevent SCD [1].

Q: Cardiomyopathy is a recognized finding in all of the following conditions except?

None of the above. **Explanation:** The correct answer is **None of the above** because all three conditions listed (Friedreich's ataxia, Transfusion hemosiderosis, and Cystic fibrosis) are clinically associated with the development of cardiomyopathy [1]. 1. **Friedreich's Ataxia (FA):** This is an autosomal recessive trinucleotide repeat (GAA) disorder. Hypertrophic cardiomyopathy is a hallmark feature, occurring in up to 90% of patients [1]. It typically presents as concentric left ventricular hypertrophy and can eventually progress to heart failure, which is the leading cause of death in FA patients. 2. **Transfusion Hemosiderosis:** Chronic blood transfusions (e.g., in Thalassemia major) lead to iron overload. Iron deposits in the myocardium, causing **Restrictive Cardiomyopathy** initially, which later evolves into **Dilated Cardiomyopathy** [2]. This is a classic "infiltrative" cause of heart muscle disease. 3. **Cystic Fibrosis (CF):** While primarily a pulmonary disease, CF can lead to cardiomyopathy through two mechanisms: * **Cor Pulmonale:** Right-sided heart failure due to chronic pulmonary hypertension. * **Direct Myocardial Involvement:** Chronic inflammation, nutritional deficiencies (Selenium/Vitamin E), and CFTR protein dysfunction in cardiac myocytes can lead to primary myocardial fibrosis and dilated cardiomyopathy [2]. **NEET-PG High-Yield Pearls:** * **Friedreich’s Ataxia:** Most common cause of death is **HOCM/Heart Failure**. * **Iron Overload:** The most sensitive tool for monitoring cardiac iron is **Cardiac T2* MRI**. * **Hemochromatosis:** Often presents as the "Bronze Diabetes" triad (Pigmentation, Diabetes, and Cirrhosis/Cardiomyopathy).

Q: ST depression and T wave inversion in leads V1 to V6 and aVL indicate which of the following?

Anterolateral wall AMI. **Explanation:** The presence of ST-segment and T-wave changes in leads **V1 to V6** (precordial leads) and **aVL** (lateral lead) signifies pathology involving the **Anterolateral wall** of the left ventricle [2]. 1. **Why Anterolateral AMI is correct:** In the context of an Acute Myocardial Infarction (AMI), leads V1–V4 represent the **Anterior wall**, while leads V5, V6, I, and aVL represent the **Lateral wall** [2]. When changes occur across V1 through V6 plus aVL, it indicates a massive infarction involving both territories, typically due to a proximal occlusion of the **Left Anterior Descending (LAD) artery** or the **Left Main Coronary Artery**. While ST-elevation is the hallmark of STEMI [3], ST-depression and T-wave inversion in these leads signify **NSTEMI** or severe subendocardial ischemia of the anterolateral wall. 2. **Why other options are incorrect:** * **Posterior wall AMI:** Characterized by *reciprocal* ST-depression and tall R waves in V1–V3. It does not typically involve V4–V6 or aVL. * **Inferior AMI:** Involves leads II, III, and aVF (supplied by the Right Coronary Artery) [1]. * **Lateral wall AMI:** Isolated lateral involvement would typically show changes only in I, aVL, V5, and V6, sparing the septal/anterior leads (V1–V4). **High-Yield Clinical Pearls for NEET-PG:** * **LAD Occlusion:** Known as the "Widow Maker." * **Lead Groupings:** * Septal: V1, V2 * Anterior: V3, V4 [2] * Lateral: I, aVL, V5, V6 * Inferior: II, III, aVF [1] * **Wellen’s Syndrome:** Deeply inverted or biphasic T-waves in V2–V3; a critical warning sign of high-grade proximal LAD stenosis.

Q: Anacrotic pulse is seen in which of the following conditions?

Aortic stenosis. **Explanation:** The **Anacrotic pulse** (from the Greek *ana* meaning up and *krotos* meaning beat) is a small-volume, slow-rising pulse characterized by a notch on the ascending limb of the arterial pulse wave. **Why Aortic Stenosis is correct:** In **Aortic Stenosis (AS)**, there is a mechanical obstruction to the left ventricular outflow. This results in a prolonged ejection time as the heart struggles to pump blood through a narrowed valve. This produces the classic **"Pulsus Parvus et Tardus"** (small volume and late/slow-rising pulse). The "anacrotic notch" occurs because the initial ejection is interrupted by the resistance of the stenotic valve, making it a hallmark finding of severe valvular AS [1]. **Why the other options are incorrect:** * **Aortic Regurgitation:** Characterized by a **Water-hammer pulse** (Corrigan’s pulse), which is a large-volume, rapidly collapsing pulse due to increased stroke volume and rapid runoff into the aorta and back into the ventricle [3], [4]. * **Mitral Regurgitation:** Usually presents with a normal or slightly low-volume pulse (if cardiac output is reduced), but never an anacrotic pulse [2]. * **Mitral Stenosis:** Typically presents with a **low-volume pulse** (Pulsus Parvus) due to reduced stroke volume, but the upstroke remains normal. **High-Yield Clinical Pearls for NEET-PG:** * **Pulsus Bisferiens:** Seen in AR + AS or Hypertrophic Obstructive Cardiomyopathy (HOCM). * **Pulsus Alternans:** A sign of severe Left Ventricular Failure (LVF). * **Pulsus Paradoxus:** Characterized by a >10 mmHg drop in systolic BP during inspiration; seen in Cardiac Tamponade, Severe Asthma, and COPD. * **Dicrotic Pulse:** A double-peaked pulse with the second peak in diastole; seen in low cardiac output states like dilated cardiomyopathy or febrile states (Typhoid) [3].

Question 1

Which of the following is not a feature of a pansystolic murmur?

Accepted Answer

Mitral stenosis

Answer

Atrial septal defect

Answer

Ventricular septal defect

Answer

Mitral regurgitation

Question 2

A patient of myocardial infarction dies within the first few hours of infarction due to which of the following complications?

Accepted Answer

Cardiac failure

Answer

Ventricular fibrillation

Answer

Atrial fibrillation

Answer

Cardiac tamponade

Question 3

A young man with a history of breathlessness while walking to the gym has an ejection murmur on examination that increases with the Valsalva maneuver. Echocardiogram shows left ventricular hypertrophy (LVH) with deep Q waves in anterior chest leads. What should this patient avoid?

Accepted Answer

Digitalis

Answer

Regular walking in the gym

Answer

Verapamil

Answer

Sublingual nitroglycerine

Question 4

A 25-year-old man presents with headache, dizziness, and bilateral leg claudication. Physical examination reveals hypertension in the upper limbs and hypotension in the lower limbs. Which of the following additional findings is most likely in this patient?

Accepted Answer

Notching of inferior margins of ribs

Answer

Aortic valvular stenosis

Answer

Patent ductus arteriosus

Answer

Vasculitis involving the aortic arch

Question 5

All of the following are cardiovascular complications of HIV infection, EXCEPT:

Accepted Answer

Aortic Aneurysm

Answer

Cardiomyopathy

Answer

Pericardial Effusion

Answer

Cardiac Tamponade

Question 6

A 57-year-old woman presents to the hospital with a 2-hour history of retrosternal chest pain and dyspnea. Her electrocardiogram (ECG) reveals an acute myocardial infarction pattern. Which of the following ECG patterns is consistent with that interpretation?

Accepted Answer

elevated ST segments

Answer

tall P waves

Answer

prominent U waves

Answer

small QRS complex

Question 7

Which of the following is NOT a high-risk factor for sudden cardiac death in hypertrophic cardiomyopathy?

Accepted Answer

Left ventricular septal thickness of 2-3 cm

Answer

Family history of sudden cardiac death

Answer

Non-sustained ventricular tachycardia on cardiac monitoring

Answer

Abnormal drop in systolic blood pressure

Question 8

Cardiomyopathy is a recognized finding in all of the following conditions except?

Accepted Answer

None of the above

Answer

Friedreich's ataxia

Answer

Transfusion hemosiderosis

Answer

Cystic fibrosis

Question 9

ST depression and T wave inversion in leads V1 to V6 and aVL indicate which of the following?

Accepted Answer

Anterolateral wall AMI

Answer

Posterior wall AMI

Answer

Inferior AMI

Answer

Lateral wall AMI

Question 10

Anacrotic pulse is seen in which of the following conditions?

Accepted Answer

Aortic stenosis

Answer

Aortic regurgitation

Answer

Mitral regurgitation

Answer

Mitral stenosis

Cardiology — MCQs

Cardiology — MCQs

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