Cardiology Practice Questions

Q: What is the secondary prophylaxis for a patient with a history of myocardial infarction who was previously treated with antiplatelet and thrombolytic therapy?

Beta-blockers. The primary goal of secondary prophylaxis post-Myocardial Infarction (MI) is to reduce mortality, prevent recurrent ischemic events, and limit ventricular remodeling. **Why Beta-blockers are the correct choice:** Beta-blockers (e.g., Metoprolol, Carvedilol, Bisoprolol) are a cornerstone of post-MI therapy [1]. They decrease myocardial oxygen demand by reducing heart rate, blood pressure, and contractility. More importantly, they provide **mortality benefits** by preventing life-threatening ventricular arrhythmias and reducing the risk of sudden cardiac death [4]. Clinical trials have consistently shown that long-term beta-blocker therapy reduces both all-cause mortality and re-infarction rates. **Why other options are incorrect:** * **Calcium Channel Blockers (CCBs):** These are not first-line for secondary prophylaxis. While they can be used for symptom control in patients who cannot tolerate beta-blockers, they do not provide the same proven mortality benefit [1]. Short-acting nifedipine is actually contraindicated as it may cause reflex tachycardia [1]. * **Nitrates:** These are excellent for symptomatic relief of angina (vasodilation), but they have **no mortality benefit** in the chronic post-MI setting [3]. * **Aldosterone Antagonists:** While used post-MI, they are specifically indicated only for patients with a reduced Ejection Fraction (EF ≤ 40%) and either heart failure symptoms or diabetes. They are not the universal first-line choice compared to beta-blockers [2]. **High-Yield Clinical Pearls for NEET-PG:** * **The "Big Four" for Post-MI Prophylaxis:** Aspirin (Antiplatelets), Beta-blockers, ACE inhibitors/ARBs, and Statins [3]. * **Contraindications:** Avoid beta-blockers in acute heart failure (until stabilized), severe bradycardia, or high-grade AV blocks [1]. * **Cardioselective agents:** Metoprolol and Bisoprolol are preferred to minimize bronchospasm in patients with mild COPD.

Q: A 72-year-old woman is found to have an irregular pulse rate at a routine clinic visit. She is experiencing no new symptoms at rest or on exertion. Her past medical history includes hypertension, osteoarthritis, and dyslipidemia. On physical examination, the blood pressure is 135/85 mm Hg, heart rate is approximately 72/min and irregular. The heart sounds reveal an irregular S1 and normal S2 with no audible murmurs. The jugular venous pressure is normal and the lungs are clear. On the ECG, there are no P waves and an irregular RR interval at a rate of 70/min. On her previous ECG from 4 years ago she was in sinus rhythm. Which of the following is the most appropriate next step in management?

Anticoagulation. **Explanation:** The clinical presentation of an irregular pulse, absent P waves, and irregular RR intervals on ECG confirms a diagnosis of **Atrial Fibrillation (AF)** [2]. In this 72-year-old patient, the primary goal of management is stroke prevention [1]. **1. Why Anticoagulation is Correct:** The decision to anticoagulate is based on the **CHA₂DS₂-VASc score**, which assesses stroke risk [3]. This patient scores **3 points** (Age 65–74 = 1; Female = 1; Hypertension = 1). For women with a score ≥2, oral anticoagulation (DOACs like Apixaban or Warfarin) is strongly recommended to prevent thromboembolic events [3]. Since her heart rate is already controlled (70–72 bpm) and she is asymptomatic, stroke prophylaxis is the immediate priority. **2. Why Other Options are Incorrect:** * **A & B (Cardioversion/Antiarrhythmics):** These are "Rhythm Control" strategies. They are generally reserved for patients who are hemodynamically unstable or symptomatic despite rate control [1]. Furthermore, cardioversion without prior anticoagulation (for at least 3 weeks) in AF of unknown duration poses a high risk of embolic stroke. * **C (Beta-blocker):** This is a "Rate Control" strategy. While beta-blockers are first-line for rate control, this patient’s resting heart rate is already 72 bpm (target is typically <110 bpm). Additional rate control is not currently indicated [3]. **Clinical Pearls for NEET-PG:** * **CHA₂DS₂-VASc Score:** **C**HF, **H**TN, **A**ge ≥75 (2 pts), **D**M, **S**troke/TIA (2 pts), **V**ascular disease, **A**ge 65-74 (1 pt), **S**ex **c**ategory (Female) [3]. * **Rate vs. Rhythm:** The AFFIRM trial showed no significant difference in mortality between rate and rhythm control; hence, rate control is often preferred in elderly, asymptomatic patients. * **Valvular AF:** If AF is due to moderate-to-severe Mitral Stenosis or a mechanical heart valve, **Warfarin** is mandatory; DOACs are contraindicated.

Q: All of the following are seen in cardiac tamponade except?

Warm periphery. Explanation: Cardiac tamponade is a life-threatening condition caused by the accumulation of fluid in the pericardial space, leading to increased intrapericardial pressure [1]. This pressure compresses the heart chambers, severely restricting diastolic filling and reducing stroke volume [1]. Why "Warm Periphery" is the correct answer: In cardiac tamponade, the significant drop in cardiac output triggers a sympathetic nervous system response. This results in systemic vasoconstriction to maintain blood pressure to vital organs. Consequently, patients present with cold, clammy extremities and signs of peripheral cyanosis. A "warm periphery" is characteristic of distributive shocks (like septic or anaphylactic shock) where vasodilation occurs, not obstructive shock like tamponade. Analysis of other options: * Pulsus Paradoxus: This is a classic hallmark of tamponade. It is defined as an exaggerated drop in systolic blood pressure (>10 mmHg) during inspiration due to interventricular septal shifting. * Feeble Heart Sounds: Part of the classic Beck’s Triad, heart sounds become muffled or "distant" because the fluid layer acts as an acoustic insulator between the heart and the stethoscope. * Less Urine Output: Reduced cardiac output leads to decreased renal perfusion, triggering the renin-angiotensin-aldosterone system (RAAS) and resulting in oliguria. NEET-PG High-Yield Pearls: * Beck’s Triad: Hypotension, Jugular Venous Distension (JVD), and Muffled Heart Sounds. * ECG Findings: Low voltage QRS complexes and Electrical Alternans (pathognomonic) [1]. * JVP Finding: Prominent 'x' descent with an absent 'y' descent (due to restricted diastolic filling). * Management: Immediate needle pericardiocentesis [1].

Q: All of the following are used in the treatment of cardiac arrest following ventricular fibrillation, except?

Atropine. In the management of cardiac arrest due to **Ventricular Fibrillation (VF)** or pulseless Ventricular Tachycardia (pVT), the primary goal is defibrillation followed by high-quality CPR and vasopressors. **1. Why Atropine is the Correct Answer (The "Except"):** Atropine is a parasympatholytic (anticholinergic) agent that increases the heart rate by blocking vagal tone at the SA node. It is indicated for **symptomatic bradycardia** and was historically used for asystole or slow PEA. However, it has **no role** in the treatment of VF/pVT. Current ACLS guidelines have removed atropine from the cardiac arrest algorithm because evidence shows it provides no therapeutic benefit during tachyarrhythmic arrests. **2. Analysis of Incorrect Options:** * **Epinephrine:** The cornerstone of ACLS. It is a sympathomimetic used for its alpha-adrenergic effects to increase coronary and cerebral perfusion pressure during CPR. * **Antiarrhythmic agents:** Drugs like **Amiodarone** (first-line) or **Lidocaine** are indicated in shock-refractory VF/pVT to stabilize the myocardial membrane and increase the success rate of subsequent shocks. * **Vasopressin:** Though removed from some recent simplified algorithms to streamline the process, it is a potent vasoconstrictor that was traditionally used as an alternative to the first or second dose of Epinephrine in cardiac arrest. **Clinical Pearls for NEET-PG:** * **Shockable Rhythms:** VF and Pulseless VT. * **Non-Shockable Rhythms:** Asystole and PEA (Atropine is no longer used here either). * **Amiodarone Dose in VF:** 300mg IV bolus, followed by a second dose of 150mg if needed. * **H's and T's:** Always remember to look for reversible causes (Hypoxia, Hypovolemia, Tension pneumothorax, etc.) during resuscitation.

Q: Rapid high-frequency fluttering of anterior mitral valve leaflets during systole on 2D echocardiography is characteristically seen with which condition?

Aortic regurgitation. ### Explanation **Correct Answer: D. Aortic regurgitation** The characteristic finding of **diastolic fluttering** of the anterior mitral valve leaflet (AMVL) is a classic echocardiographic sign of **Aortic Regurgitation (AR)**. **Pathophysiology:** In aortic regurgitation, blood leaks backward from the aorta into the left ventricle during diastole. This regurgitant jet is directed toward the ventricular cavity and often strikes the **anterior leaflet of the mitral valve**. The high-velocity impact of this jet against the leaflet causes it to vibrate or "flutter." Because the mitral valve is open during diastole to allow filling from the left atrium, the AR jet interferes with its position, leading to this rapid high-frequency motion. **Analysis of Incorrect Options:** * **A. Mitral regurgitation:** This involves blood flowing backward from the LV to the LA during systole. It does not cause fluttering of the leaflets during diastole; rather, it may show structural abnormalities like prolapse or flail leaflets. * **B & C. Tricuspid and Pulmonary regurgitation:** These involve the right side of the heart. Their jets do not interact with the mitral valve, which is located on the left side. **High-Yield Clinical Pearls for NEET-PG:** * **Austin Flint Murmur:** The AR jet can also partially close the mitral valve prematurely, creating functional mitral stenosis. This produces a mid-diastolic, low-pitched rumbling murmur known as the Austin Flint murmur. * **M-Mode Finding:** On M-mode echocardiography, this fluttering appears as fine oscillations of the AMVL. * **Reverse Doming:** In severe AR, the jet may cause "downward" or "reverse" doming of the AMVL. * **Key Association:** Always look for **wide pulse pressure** and **water-hammer pulse** in clinical vignettes describing these echo findings.

Question 1

A 52-year-old man presents with sudden crushing chest pain and tachycardia. He admits to cigarette smoking, consumption of alcohol, and abuse of illicit drugs. An ECG is consistent with ischemic change in the anteroseptal region of the heart. Laboratory studies show elevated serum levels of CK-MB and troponin I. Serum cholesterol is 240 mg/dL. Which of the following most likely contributed to this patient's condition?

Accepted Answer

Cigarette smoking

Answer

Alcohol consumption

Answer

Heroin addiction

Answer

Inadequate calcium intake

Question 2

All of the following can lead to AV block except?

Accepted Answer

Ankylosing spondylitis

Answer

Hypothyroidism

Answer

Lyme disease

Answer

Lev's disease

Question 3

All of the following are major criteria in the diagnosis of Acute Rheumatic Fever, except?

Accepted Answer

Migratory Polyarthralgia

Answer

Subcutaneous Nodules

Answer

Chorea

Answer

Carditis

Question 4

All of the following are true regarding hypertrophic cardiomyopathy EXCEPT:

Accepted Answer

Digoxin is helpful

Answer

Irregular thickness of septa

Answer

Dynamic obstruction

Answer

Double apical impulse

Question 5

What is the secondary prophylaxis for a patient with a history of myocardial infarction who was previously treated with antiplatelet and thrombolytic therapy?

Accepted Answer

Beta-blockers

Answer

Calcium channel blockers

Answer

Nitrates

Answer

Aldosterone antagonists

Question 6

A 72-year-old woman is found to have an irregular pulse rate at a routine clinic visit. She is experiencing no new symptoms at rest or on exertion. Her past medical history includes hypertension, osteoarthritis, and dyslipidemia. On physical examination, the blood pressure is 135/85 mm Hg, heart rate is approximately 72/min and irregular. The heart sounds reveal an irregular S1 and normal S2 with no audible murmurs. The jugular venous pressure is normal and the lungs are clear. On the ECG, there are no P waves and an irregular RR interval at a rate of 70/min. On her previous ECG from 4 years ago she was in sinus rhythm. Which of the following is the most appropriate next step in management?

Accepted Answer

Anticoagulation

Answer

Cardioversion

Answer

Antiarrhythmic therapy

Answer

Beta-blocker

Question 7

All of the following are seen in cardiac tamponade except?

Accepted Answer

Warm periphery

Answer

Pulsus paradoxus

Answer

Feeble heart sounds

Answer

Less urine output

Question 8

All of the following are used in the treatment of cardiac arrest following ventricular fibrillation, except?

Accepted Answer

Atropine

Answer

Epinephrine

Answer

Antiarrhythmic agents

Answer

Vasopressin

Question 9

Rapid high-frequency fluttering of anterior mitral valve leaflets during systole on 2D echocardiography is characteristically seen with which condition?

Accepted Answer

Aortic regurgitation

Answer

Mitral regurgitation

Answer

Tricuspid regurgitation

Answer

Pulmonary regurgitation

Question 10

A young man, previously diagnosed with congenital heart disease with a left-to-right shunt, has a very loud pansystolic murmur at the left sternal edge without any hemodynamic disturbance. What is the most likely diagnosis?

Accepted Answer

Large ventricular septal defect

Answer

Atrial septal defect

Answer

Small ventricular septal defect

Answer

Eisenmenger's syndrome

Cardiology — MCQs

Cardiology — MCQs

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