Cardiology Practice Questions

Q: Which of the following conditions is associated with AV block?

Hypothyroidism. **Explanation:** **Correct Answer: A. Hypothyroidism** Hypothyroidism is a well-recognized cause of reversible Atrioventricular (AV) block. Thyroid hormones exert a direct effect on the cardiac conduction system by regulating the expression of ion channels (like $Na^+/K^+$ ATPase) and calcium-handling proteins. In a hypothyroid state, there is a decrease in sympathetic activity and a prolongation of the action potential duration, leading to **sinus bradycardia** and delayed conduction through the AV node. This can manifest as a First-degree AV block or, in severe cases (like Myxedema coma), higher-grade blocks. **Incorrect Options:** * **B. Hyperthyroidism:** Excess thyroid hormone increases the sensitivity of $̢$-adrenergic receptors. This typically leads to **tachyarrhythmias**, most notably sinus tachycardia and **Atrial Fibrillation** [2]. * **C. Cushing Disease:** Excess cortisol leads to hypertension and metabolic alkalosis. While it causes structural changes like Left Ventricular Hypertrophy (LVH), it is not a classic cause of AV block. * **D. Pheochromocytoma:** Catecholamine excess leads to paroxysmal hypertension and **tachyarrhythmias** (sinus tachycardia, PVCs, or VT). It does not cause conduction delays. **High-Yield Clinical Pearls for NEET-PG:** * **ECG in Hypothyroidism:** Look for the "Hypothyroid Triad": Sinus bradycardia, Low voltage complexes, and T-wave inversions [3]. * **Reversibility:** AV blocks caused by hypothyroidism are often reversible with Levothyroxine replacement, potentially avoiding the need for a permanent pacemaker [1]. * **Other Metabolic Causes of AV Block:** Hyperkalemia, Hypermagnesemia, and Digoxin toxicity [3].

Q: Which type of cardiomyopathy is typically seen in individuals with chronic alcoholism?

Dilated Cardiomyopathy. Alcoholic Cardiomyopathy (ACM) is a specific form of **Dilated Cardiomyopathy (DCM)**. It occurs due to the direct toxic effects of ethanol and its metabolite, acetaldehyde, on the myocardium [1]. **Why Dilated Cardiomyopathy is correct:** Chronic alcohol consumption leads to myofibrillary degeneration, lipid deposition, and mitochondrial dysfunction. This results in **ventricular chamber enlargement (dilation)** and impaired systolic function (reduced ejection fraction) [1]. Patients typically present with signs of congestive heart failure, such as dyspnea, orthopnea, and cardiomegaly on X-ray [4]. **Why other options are incorrect:** * **Hypertrophic Cardiomyopathy (Obstructive/Non-obstructive):** These are primarily genetic disorders caused by mutations in sarcomeric proteins (e.g., MYH7, MYBPC3) [3]. They are characterized by asymmetrical septal hypertrophy, not the global dilation seen in alcoholism. * **Restrictive Cardiomyopathy:** This is usually caused by infiltrative processes like amyloidosis, sarcoidosis, or hemochromatosis. It results in stiff ventricles with impaired diastolic filling, which is a different pathophysiological mechanism than alcohol toxicity. **High-Yield Clinical Pearls for NEET-PG:** * **Reversibility:** Unlike many other forms of DCM, alcoholic cardiomyopathy is potentially **reversible** if the patient practices total abstinence from alcohol in the early stages. * **Thiamine Deficiency:** Chronic alcoholics may have concurrent Beriberi (Wet Beriberi), which also causes high-output heart failure, but ACM is a distinct entity caused by direct toxicity [2]. * **Arrhythmias:** Alcohol is also associated with "Holiday Heart Syndrome," most commonly manifesting as **Atrial Fibrillation**. * **Diagnosis:** Echocardiography shows four-chamber dilation and a low ejection fraction.

Q: An otherwise healthy athlete complains of chest pain and dyspnea during routine training, has a double impulse at the apex on examination, and undergoes sudden death. What is the likely diagnosis?

Hypertrophic Obstructive Cardiomyopathy (HOCM). ### **Explanation** The clinical presentation of a young, healthy athlete experiencing exertional chest pain and dyspnea, followed by sudden cardiac death (SCD), is a classic hallmark of **Hypertrophic Obstructive Cardiomyopathy (HOCM)** [1]. **Why HOCM is the Correct Answer:** 1. **Sudden Cardiac Death in Athletes:** HOCM is the most common cause of SCD in young athletes, usually due to ventricular arrhythmias [1], [2]. 2. **Double Impulse at Apex:** This is a pathognomonic finding. The first impulse is a forceful atrial contraction (S4) against a non-compliant ventricle, and the second is the actual ventricular apex beat. 3. **Pathophysiology:** Asymmetrical septal hypertrophy leads to Left Ventricular Outflow Tract (LVOT) obstruction, which worsens during exertion, causing symptoms like angina and syncope [1]. **Analysis of Incorrect Options:** * **Marfan Syndrome:** While associated with SCD, it usually occurs due to **aortic dissection or rupture**. It does not typically present with a double apical impulse. * **Myocardial Infarction (MI):** Rare in young, "otherwise healthy" athletes without significant risk factors or congenital coronary anomalies [2]. * **Valvular Heart Disease:** While Aortic Stenosis can cause exertional symptoms and SCD, it presents with a slow-rising pulse (*pulsus parvus et tardus*) and a single, heaving apex beat, not a double impulse [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Murmur Dynamics:** HOCM features a harsh systolic ejection murmur that **increases** with Valsalva and standing (decreased preload) and **decreases** with squatting or handgrip (increased preload/afterload). * **ECG Findings:** Look for "dagger-like" Q waves in lateral leads (I, aVL, V5-V6). * **Management:** Beta-blockers are the first-line medical therapy; ICD is the definitive treatment for those at high risk of SCD.

Q: A 50-year-old male presented to the emergency department with a blood pressure of 160/100 mmHg and a heart rate of 120 bpm. A CECT scan was performed, and the image is provided. What is the management of the condition shown?

Surgical repair. ***Surgical repair*** - **Type A aortic dissection** (involving ascending aorta) requires **emergency surgical repair** to prevent fatal complications like **cardiac tamponade** or **aortic rupture**. - The elevated blood pressure (160/100 mmHg) and tachycardia (120 bpm) are consistent with **acute aortic dissection**, making immediate surgical intervention life-saving. *Low molecular weight heparin* - **Anticoagulation is contraindicated** in aortic dissection as it increases the risk of **extension of dissection** and **hemorrhage**. - LMWH would worsen the **intramural bleeding** and potentially lead to **fatal rupture** of the aortic wall. *Beta blocker medication* - While **beta blockers** are used in **Type B aortic dissection** (descending aorta only) for **blood pressure control**, they are insufficient for Type A dissection. - **Type A dissection** requires surgical intervention regardless of medical management due to high mortality risk without surgery. *Vitamin K inhibitors* - **Warfarin and other vitamin K antagonists** are absolutely contraindicated in acute aortic dissection due to **bleeding risk**. - These medications would promote **hemorrhage into the dissection plane** and increase the likelihood of **aortic rupture** and death.

Q: A patient presents with palpitations. He has no past history of similar episodes but reports consuming a large amount of coffee at work. What is the most appropriate first-line treatment for this patient?

Vagal maneuvers. **Explanation:** The clinical presentation of palpitations following excessive caffeine intake is highly suggestive of **Paroxysmal Supraventricular Tachycardia (PSVT)**, most commonly AV Nodal Reentrant Tachycardia (AVNRT) [1]. Caffeine acts as a sympathomimetic trigger that can initiate these reentrant circuits [1]. **1. Why Vagal Maneuvers are Correct:** According to the ACLS guidelines for stable narrow-complex tachycardia, **vagal maneuvers** (e.g., Valsalva maneuver or carotid sinus massage) are the **first-line intervention**. These maneuvers increase parasympathetic tone and slow conduction through the AV node, which can terminate the reentrant circuit in approximately 20-25% of cases. They are non-invasive, require no equipment, and carry minimal risk in a stable patient. **2. Why Other Options are Incorrect:** * **B. Intravenous Adenosine:** This is the drug of choice and the **second step** if vagal maneuvers fail [1]. It causes a transient AV block to break the circuit. * **C. Catheter Ablation:** This is the definitive/long-term treatment for recurrent PSVT but is never the first-line management for an acute episode. * **D. Cardioversion:** Synchronized DC cardioversion is indicated only if the patient is **hemodynamically unstable** (e.g., hypotension, altered mental status, chest pain, or heart failure). **Clinical Pearls for NEET-PG:** * **Modified Valsalva:** The "Leg-up" Valsalva (blowing into a syringe while supine, followed by passive leg elevation) has a much higher success rate (~43%) than the standard maneuver. * **Adenosine Contraindication:** Avoid adenosine in patients with **Asthma** (can cause bronchospasm) or WPW syndrome with Atrial Fibrillation [1]. * **Drug of Choice for Prevention:** Beta-blockers or Calcium Channel Blockers (Verapamil/Diltiazem) are used for long-term prophylaxis if ablation is not performed.

Question 1

Which of the following conditions is associated with AV block?

Accepted Answer

Hypothyroidism

Answer

Hyperthyroidism

Answer

Cushing disease

Answer

Pheochromocytoma

Question 2

A 55-year-old man presents with chest discomfort, fatigue, and palpitations. His blood pressure is 85/50 mm Hg and heart rate is 140 beats per minute. Which of the following is the best treatment for this patient?

Accepted Answer

Cardioversion

Answer

Digoxin

Answer

Calcium channel blocker

Answer

Coumadin

Question 3

Which type of cardiomyopathy is typically seen in individuals with chronic alcoholism?

Accepted Answer

Dilated Cardiomyopathy

Answer

Hypertrophic obstructive cardiomyopathy

Answer

Restrictive Cardiomyopathy

Answer

Hypertrophic non-obstructive cardiomyopathy

Question 4

An otherwise healthy athlete complains of chest pain and dyspnea during routine training, has a double impulse at the apex on examination, and undergoes sudden death. What is the likely diagnosis?

Accepted Answer

Hypertrophic Obstructive Cardiomyopathy (HOCM)

Answer

Marfan syndrome

Answer

Myocardial Infarction

Answer

Valvular heart disease

Question 5

An elderly man with known ischemic heart disease develops syncope. Peripheral pulses are absent, blood pressure is not recordable, and ECG reveals wide complex tachycardia. What is the immediate management?

Accepted Answer

DC cardioversion

Answer

Thrombolysis with tissue plasminogen activator

Answer

A bolus dose of lidocaine

Answer

IV phenylephrine and carotid sinus pressure

Question 6

The 'a' wave in JVP is seen in which of the following conditions?

Accepted Answer

It will be large when the atria contracts against resistance.

Answer

It represents the filling of the ventricles.

Answer

It is followed by the 'v' wave.

Answer

It decreases during inspiration.

Question 7

A 50-year-old male presented to the emergency department with a blood pressure of 160/100 mmHg and a heart rate of 120 bpm. A CECT scan was performed, and the image is provided. What is the management of the condition shown?

Accepted Answer

Surgical repair

Answer

Low molecular weight heparin

Answer

Beta blocker medication

Answer

Vitamin K inhibitors

Question 8

A patient presents with palpitations. He has no past history of similar episodes but reports consuming a large amount of coffee at work. What is the most appropriate first-line treatment for this patient?

Accepted Answer

Vagal maneuvers

Answer

Intravenous adenosine

Answer

Catheter ablation

Answer

Cardioversion

Question 9

A 26-year-old asymptomatic woman is found to have arrhythmias and a systolic murmur associated with midsystolic clicks. Which investigation would you use?

Accepted Answer

Echocardiography

Answer

Electrophysiological testing

Answer

Thyroid scan

Answer

Angiography

Question 10

An 84-year-old man with a history of smoking and a myocardial infarction 2 years ago presents with chest and leg pain during exercise. His vital signs are temperature, 37.1°C; pulse, 81/min; respirations, 15/min; and blood pressure, 165/100 mm Hg. Peripheral pulses are diminished in the lower extremities. A 7-cm pulsating mass is palpable in the midline of the lower abdomen. Laboratory studies show fasting serum glucose levels of 170 mg/dL and 200 mg/dL. Which of the following vascular lesions is most likely to be present in this patient?

Accepted Answer

Atherosclerotic aneurysm

Answer

Aortic dissection

Answer

Arteriovenous fistula

Answer

Polyarteritis nodosa

Cardiology — MCQs

Cardiology — MCQs

On this page

Practice by Chapter

Want unlimited practice?