Cardiology Practice Questions

Q: What is the treatment of choice for congestive heart failure with hypertension?

ACE inhibitors. **Explanation:** **ACE inhibitors (ACEIs)** are the treatment of choice for patients with coexisting congestive heart failure (CHF) and hypertension [1]. The underlying medical concept is their ability to provide **balanced vasodilation** (reducing both preload and afterload) and, more importantly, to inhibit the **Renin-Angiotensin-Aldosterone System (RAAS)** [2]. By blocking Angiotensin II, ACEIs prevent cardiac remodeling and fibrosis, which are key drivers of heart failure progression [2]. They are one of the few drug classes proven to **reduce mortality** in CHF [1]. **Why other options are incorrect:** * **Alpha-blockers:** These are not first-line for CHF. While they lower blood pressure, they can cause reflex tachycardia and fluid retention, potentially worsening heart failure symptoms. * **Calcium Channel Blockers (CCBs):** Non-dihydropyridines (Verapamil/Diltiazem) are contraindicated in CHF due to their negative inotropic effects. While Amlodipine is safe, it does not provide the mortality benefits seen with ACEIs. * **Nitrates:** These are primarily venodilators (reducing preload) [3]. While useful in acute heart failure or in combination with Hydralazine (especially in specific populations), they are not the primary first-line monotherapy for managing chronic CHF with hypertension [3]. **High-Yield Clinical Pearls for NEET-PG:** * **First-line triad for HFrEF:** ACEIs (or ARBs/ARNIs), Beta-blockers, and Aldosterone antagonists [1]. * **Side Effects:** Watch for **dry cough** (due to bradykinin accumulation) and **angioedema**. If a cough develops, switch the patient to an ARB (Losartan). * **Contraindications:** ACEIs are strictly contraindicated in **pregnancy** (teratogenic) and **bilateral renal artery stenosis**.

Q: A patient develops sudden palpitation with a heart rate of 150 beats per minute, which is regular. What could be the cause?

Paroxysmal supraventricular tachycardia (PSVT). ### Explanation **1. Why PSVT is the Correct Answer:** The clinical hallmark of **Paroxysmal Supraventricular Tachycardia (PSVT)** is a sudden onset and termination of palpitations [1]. In PSVT (most commonly AVNRT), the heart rate typically ranges between **140–220 bpm** and is characteristically **regular** [1]. The "sudden" nature described in the question points toward a re-entrant mechanism rather than a gradual physiological response, which involves two pathways with different conducting properties [2]. **2. Analysis of Incorrect Options:** * **Sinus Tachycardia:** While regular, it usually has a gradual onset and offset (not sudden). It is typically a physiological response to stress, fever, or exercise, and rarely exceeds 150 bpm in a resting adult. * **Ventricular Tachycardia (VT):** Although regular, VT usually presents in patients with structural heart disease or prior MI [3]. While it can cause palpitations, PSVT is a more common cause of a regular rate of exactly 150 bpm in a stable, "sudden onset" scenario unless hemodynamic instability is mentioned. * **Atrial Flutter with Block:** Atrial flutter typically has an atrial rate of 300 bpm. With a 2:1 conduction block, the ventricular rate is exactly **150 bpm**. However, the "sudden" paroxysmal onset in a general clinical vignette most classically refers to PSVT. **3. NEET-PG High-Yield Pearls:** * **Vagal Maneuvers:** The first-line treatment for stable PSVT (Carotid sinus massage or Valsalva). * **Drug of Choice:** **Adenosine** (6mg IV rapid bolus) is the DOC for terminating acute PSVT. * **ECG Findings:** Narrow QRS complex, regular rhythm, and P-waves often buried within or following the QRS complex [1]. * **Definitive Treatment:** Radiofrequency ablation of the slow pathway.

Q: What is the investigation of choice for radiotherapy/chemotherapy induced myocardial damage?

Endomyocardial biopsy. **Explanation:** The gold standard and investigation of choice for diagnosing radiotherapy or chemotherapy-induced myocardial damage (specifically anthracycline-induced cardiotoxicity) is an **Endomyocardial Biopsy (EMB)**. **Why Endomyocardial Biopsy is correct:** Chemotherapeutic agents like Doxorubicin cause dose-dependent histological changes, such as myofibrillar loss and cytoplasmic vacuolization (Sarcoplasmic reticulum dilatation). EMB is the most sensitive and specific method to detect these subclinical changes *before* a significant drop in the Left Ventricular Ejection Fraction (LVEF) occurs, allowing for the modification of treatment to prevent irreversible heart failure. **Why other options are incorrect:** * **CT Scan:** While useful for pericardial thickening or calcification post-radiation, it lacks the resolution to detect microscopic cellular damage to myocytes. * **MRI:** Cardiac MRI (using T1/T2 mapping and Late Gadolinium Enhancement) is excellent for detecting fibrosis and inflammation. While it is the "non-invasive" investigation of choice for many cardiomyopathies, it remains secondary to biopsy for definitive histopathological grading of drug-induced damage. * **Precordial Doppler:** This is used to assess diastolic and systolic function. While commonly used for routine monitoring (via MUGA or Echo), it only detects damage once functional impairment has already started, making it less sensitive than a biopsy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common Echo finding:** Decrease in LVEF is the classic sign of toxicity. * **Anthracycline Toxicity:** Characterized by "Adriamycin cells" (vacuolated myocytes). * **Radiation Heart Disease:** Often presents as restrictive cardiomyopathy, constrictive pericarditis, or accelerated coronary artery disease. * **Biomarkers:** Troponin I and BNP are increasingly used as early biochemical markers of cardiotoxicity.

Q: An ejection click is heard in which phase of the cardiac cycle?

Early systole. ### Explanation **1. Why Early Systole is Correct:** Ejection clicks are high-pitched, sharp sounds occurring shortly after the first heart sound ($S_1$). They mark the end of the **isovolumetric contraction phase** and the beginning of the **ventricular ejection phase** [1]. The sound is produced by the sudden tensing of the aortic or pulmonary valve leaflets as they reach their maximum opening excursion [1]. This occurs in **early systole** when the pressure in the ventricles exceeds the pressure in the great arteries, forcing the semilunar valves to snap open. **2. Why the Other Options are Incorrect:** * **Late Systole:** This phase is associated with **mid-to-late systolic clicks**, which are characteristic of **Mitral Valve Prolapse (MVP)** due to the sudden tensing of chordae tendineae, not the opening of semilunar valves [1]. * **Early Diastole:** This phase is associated with the **Opening Snap** (Mitral Stenosis) or $S_3$ (ventricular gallop) [1]. These occur after the second heart sound ($S_2$). * **Late Diastole:** This phase is associated with $S_4$ (atrial gallop), which occurs during atrial contraction just before $S_1$. **3. Clinical Pearls for NEET-PG:** * **Aortic Ejection Click:** Best heard at the apex and base; it does **not** vary with respiration. Common in bicuspid aortic valve and aortic stenosis [1]. * **Pulmonary Ejection Click:** Best heard at the left second intercostal space. It is the **only** right-sided sound that **decreases/disappears during inspiration** (due to increased venous return keeping the valve partially open). * **Disappearance:** As valvular stenosis becomes severe and the valve becomes calcified/immobile, the ejection click may disappear [1].

Q: A 60-year-old retired banker complains of feeling dizzy with palpitations and breathlessness. His BP becomes unrecordable while ECG is being recorded. What should be the first step in the management of this patient?

Cardioversion. ### Explanation The patient is presenting with **hemodynamic instability**, evidenced by an unrecordable blood pressure (hypotension/shock) associated with symptoms of palpitations and breathlessness [3]. In any tachyarrhythmia (implied by palpitations and the need for ECG), the presence of "Red Flag" signs—such as hypotension, altered mental status, chest pain, or acute heart failure—mandates immediate **Synchronized DC Cardioversion** [1]. **Why Cardioversion is correct:** According to ACLS (Advanced Cardiovascular Life Support) guidelines, the priority in an unstable patient with a pulse is to restore sinus rhythm electrically [1]. Pharmacological interventions are bypassed because they take too long to act and may further depress myocardial function or blood pressure [4]. **Why other options are incorrect:** * **A. IV Amiodarone:** This is an anti-arrhythmic used for stable ventricular or supraventricular tachycardias. In an unstable patient, waiting for an infusion is contraindicated. * **B. IV Lasix:** While the patient has breathlessness (potential pulmonary edema), the primary cause is the arrhythmia-induced hemodynamic collapse. Diuretics will not correct the rhythm and may worsen hypotension [4]. * **D. IV Lignocaine:** Previously a first-line agent for VT, it is now considered second-line to Amiodarone and is only used in stable patients or after successful resuscitation. **Clinical Pearls for NEET-PG:** 1. **Unstable + Pulse:** Synchronized Cardioversion. 2. **Unstable + No Pulse (VF/Pulseless VT):** Defibrillation (Unsynchronized) [2]. 3. **Stable Tachycardia:** Narrow Complex (Vagal maneuvers/Adenosine); Wide Complex (Amiodarone/Procainamide). 4. **Energy Levels:** For narrow regular rhythms (SVT/Atrial Flutter), start with 50-100J; for narrow irregular (Atrial Fibrillation) or wide regular (VT), start with 120-200J.

Q: A patient with coronary artery disease and diabetes mellitus experienced a myocardial infarction two months ago. Their lipid profile shows serum triglyceride of 234 mg/dL, LDL of 124 mg/dL, and HDL of 32 mg/dL. Which of the following drugs would be most appropriate to administer?

Atorvastatin 80 mg. The core concept in this question is the management of **Secondary Prevention** in patients with established Atherosclerotic Cardiovascular Disease (ASCVD). [3] **1. Why Atorvastatin 80 mg is correct:** This patient has multiple high-risk factors: a history of Myocardial Infarction (MI), Coronary Artery Disease (CAD), and Diabetes Mellitus. According to current AHA/ACC and ESC guidelines, all patients with established ASCVD (regardless of baseline LDL) should be started on **High-Intensity Statin** therapy. High-intensity statins are defined as those that lower LDL-C by ≥50%. [1] The two standard regimens are: * **Atorvastatin 40–80 mg** * **Rosuvastatin 20–40 mg** **2. Why other options are incorrect:** * **Fenofibrate (A):** While the triglycerides are elevated (234 mg/dL), statins remain the first-line treatment. Fibrates are generally reserved for severe hypertriglyceridemia (>500 mg/dL) to prevent pancreatitis. [2] * **Rosuvastatin plus fenofibrate (B):** Routine combination therapy is not recommended as initial management and increases the risk of myopathy/rhabdomyolysis without significant cardiovascular benefit in most trials (e.g., ACCORD trial). * **Rosuvastatin 10 mg (D):** This is a **Moderate-Intensity Statin** (lowers LDL by 30-49%). It is insufficient for a post-MI patient who requires maximal plaque stabilization and LDL reduction. **Clinical Pearls for NEET-PG:** * **Target LDL:** For very high-risk ASCVD patients, the goal is often **<55 mg/dL**. * **Diabetes + Age 40-75:** Even without ASCVD, these patients require at least a moderate-intensity statin. * **Pleiotropic effects:** Statins work beyond lipid-lowering by stabilizing atherosclerotic plaques, improving endothelial function, and reducing inflammation (decreased CRP). [1] * **Rule of 6:** Each doubling of the statin dose only yields an additional 6% reduction in LDL-C.

Q: Beck's triad of cardiac tamponade does not include which of the following?

Silent heart sounds. ### Explanation **Beck’s Triad** is a classic clinical sign used to diagnose acute **cardiac tamponade**, a condition where fluid accumulation in the pericardial sac leads to increased intrapericardial pressure, restricting ventricular filling [1]. **Why "Silent heart sounds" is the correct answer:** While heart sounds in cardiac tamponade are often described as "muffled" or "distant" due to the insulating effect of the pericardial fluid, they are **not silent**. In medical examinations, precision in terminology is key; "silent" implies a total absence of sound, which is clinically inaccurate. Therefore, it is not a component of the triad. **Analysis of Incorrect Options (Components of Beck's Triad):** * **Hypotension (A):** Occurs because the fluid pressure prevents the heart from filling adequately (decreased preload), leading to a drop in stroke volume and cardiac output. * **Neck vein distension (B):** Increased intrapericardial pressure prevents blood from entering the right atrium, leading to back-pressure in the superior vena cava and visible jugular venous distension (JVD). * **Muffled heart sounds (D - corrected):** The fluid surrounding the heart dampens the transmission of sound to the chest wall. **Clinical Pearls for NEET-PG:** 1. **Pulsus Paradoxus:** Defined as an inspiratory fall in systolic blood pressure **>10 mmHg**. While a hallmark of tamponade, it is **not** part of Beck’s Triad. 2. **ECG Findings:** Look for **Electrical Alternans** (varying QRS amplitude) and low-voltage complexes [1]. 3. **Echocardiography:** The gold standard for diagnosis; shows "swinging heart" and diastolic collapse of the right atrium/ventricle [1]. 4. **Management:** The definitive treatment is immediate **pericardiocentesis**.

Question 1

What is the treatment of choice for congestive heart failure with hypertension?

Accepted Answer

ACE inhibitors

Answer

Alpha-blockers

Answer

Calcium channel blockers

Answer

Nitrates

Question 2

A patient develops sudden palpitation with a heart rate of 150 beats per minute, which is regular. What could be the cause?

Accepted Answer

Paroxysmal supraventricular tachycardia (PSVT)

Answer

Sinus tachycardia

Answer

Ventricular tachycardia

Answer

Atrial flutter with block

Question 3

What is the investigation of choice for radiotherapy/chemotherapy induced myocardial damage?

Accepted Answer

Endomyocardial biopsy

Answer

CT scan

Answer

MRI

Answer

Precordial Doppler

Question 4

An ejection click is heard in which phase of the cardiac cycle?

Accepted Answer

Early systole

Answer

Late systole

Answer

Early diastole

Answer

Late diastole

Question 5

A 60-year-old retired banker complains of feeling dizzy with palpitations and breathlessness. His BP becomes unrecordable while ECG is being recorded. What should be the first step in the management of this patient?

Accepted Answer

Cardioversion

Answer

IV Amiodarone 150mg

Answer

IV Lasix 40mg

Answer

IV lignocaine

Question 6

Which of the following statements about the pathophysiology of mitral stenosis is accurate?

Accepted Answer

Patients with mitral stenosis generally have an under-loaded left ventricle.

Answer

Patients with mitral stenosis have decreased left atrial pressure.

Answer

The increased pressure gradient between the left atrium and left ventricle results in left ventricular hypertrophy.

Answer

Diastolic filling of the left ventricle is increased in mitral stenosis because of the increased pressure gradient between the left atrium and left ventricle.

Question 7

A 59-year-old man with a history of myocardial infarction 2 years ago undergoes an uneventful aortobifemoral bypass graft for aortoiliac occlusive disease. Six hours later he develops ST segment depression, and a 12-lead electrocardiogram (ECG) shows anterolateral ischemia. His hemodynamic parameters are as follows: systemic BP 70/40 mm Hg, pulse 100 beats per minute, CVP 18 mm Hg, PCWP 25 mm Hg, cardiac output 1.5 L/min, and systemic vascular resistance 1000 (dyne * s)/cm5. Which of the following is the single best pharmacologic intervention for this patient?

Accepted Answer

Dobutamine

Answer

Sublingual nitroglycerin

Answer

Intravenous nitroglycerin

Answer

A short-acting beta-blocker

Question 8

A 20-year-old young man presents with exertional dyspnea, headache, and giddiness. On examination, there is hypertension and LVH. X-ray chest shows notching of the anterior ends of the ribs. Which of the following represents the most likely diagnosis?

Accepted Answer

Coarctation of the aorta

Answer

Pheochromocytoma

Answer

Carcinoid syndrome

Answer

Superior mediastinal syndrome

Question 9

A patient with coronary artery disease and diabetes mellitus experienced a myocardial infarction two months ago. Their lipid profile shows serum triglyceride of 234 mg/dL, LDL of 124 mg/dL, and HDL of 32 mg/dL. Which of the following drugs would be most appropriate to administer?

Accepted Answer

Atorvastatin 80 mg

Answer

Fenofibrate

Answer

Rosuvastatin plus fenofibrate

Answer

Rosuvastatin 10 mg

Question 10

Beck's triad of cardiac tamponade does not include which of the following?

Accepted Answer

Silent heart sounds

Answer

Hypotension

Answer

Neck vein distension

Answer

Pulsus paradoxus

Cardiology — MCQs

Cardiology — MCQs

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