Cardiology Practice Questions

Q: A 70-year-old man with a prior anterior myocardial infarction presents for routine evaluation. He feels well and has no symptoms. He is taking metoprolol 100 mg bid, aspirin 81 mg od, enalapril 10 mg bid, and simvastatin 40 mg od for secondary prevention. Select the characteristic ECG finding for this patient.

Prolonged PR interval. ### Explanation **Correct Answer: A. Prolonged PR interval** The correct answer is derived from the patient's current medication profile. The patient is taking **Metoprolol 100 mg BID**, which is a high-dose beta-blocker. Beta-blockers act as negative dromotropes by slowing conduction through the **Atrioventricular (AV) node** [1]. On an ECG, AV nodal conduction delay is manifested as a **prolonged PR interval** (>0.20 seconds), which represents a first-degree heart block. Given the patient is asymptomatic and on high-dose beta-blockade for secondary prevention post-MI, this is a common and expected pharmacological finding. **Analysis of Incorrect Options:** * **B. Broad-notched P wave in lead II:** This is known as *P-mitrale*, characteristic of Left Atrial Enlargement (LAE). While chronic heart failure post-MI can lead to LAE, it is not a direct pharmacological effect of his current medications. * **C. Short QT interval:** This is typically seen in hypercalcemia or digoxin toxicity. Beta-blockers and ischemia do not cause a short QT; in fact, some antiarrhythmics and electrolyte imbalances (hypokalemia) prolong the QT interval. * **D. Short PR interval:** This is characteristic of pre-excitation syndromes like Wolff-Parkinson-White (WPW) syndrome, where an accessory pathway bypasses the AV node. Beta-blockers increase the PR interval, they do not shorten it [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Beta-blocker overdose:** Treatment of choice is **Glucagon** (increases cAMP bypassing the beta-receptor). * **Post-MI Secondary Prevention:** The "Big Four" medications are Aspirin (Antiplatelet), Statins, ACE inhibitors (prevent remodeling), and Beta-blockers (reduce mortality) [2]. * **ECG Changes:** Always correlate ECG findings with the drug history. Digoxin can cause "reverse tick" ST-segment depression, while Class Ia/III antiarrhythmics prolong the QTc.

Q: Which of the following is NOT an ECG finding in Wolff-Parkinson-White syndrome?

Narrow QRS complexes. **Explanation:** Wolff-Parkinson-White (WPW) syndrome is a pre-excitation syndrome caused by an accessory pathway (the **Bundle of Kent**) that bypasses the AV node [1]. This allows electrical impulses to reach the ventricles earlier than usual [1]. **1. Why "Narrow QRS complexes" is the correct answer:** In WPW, the QRS complex is **wide (>120ms)**, not narrow [1]. This occurs because the ventricle is activated via two fronts: early activation through the accessory pathway (causing the slurred start) and subsequent activation through the normal His-Purkinje system [1]. This "fusion" of electrical signals results in a widened, distorted QRS complex. **2. Analysis of incorrect options:** * **Short PR interval (<0.12s):** This is a hallmark of WPW [1]. Because the accessory pathway lacks the physiological delay of the AV node, the time from atrial to ventricular depolarization is shortened [1]. * **Slurred and tall QRS (Delta wave):** The delta wave represents the initial slow, intramyocardial conduction through the accessory pathway [1]. It is the most characteristic finding of WPW. * **Normal QT interval:** While the QRS is widened, the repolarization (T-wave) usually adjusts such that the overall QT interval remains within normal limits [1], unless there is secondary repolarization abnormality. **Clinical Pearls for NEET-PG:** * **The WPW Triad:** Short PR interval + Delta wave + Wide QRS [1]. * **Pseudo-infarction pattern:** Delta waves can sometimes mimic Q-waves, leading to a false diagnosis of myocardial infarction. * **Treatment:** **Radiofrequency ablation** of the accessory pathway is the definitive treatment. * **Contraindication:** Avoid "ABCD" (Atrioventricular nodal blockers) in WPW with Atrial Fibrillation: **A**denosine, **B**eta-blockers, **C**alcium channel blockers, and **D**igoxin, as they can paradoxically increase conduction through the accessory pathway, leading to Ventricular Fibrillation [2].

Q: Following an attack of myocardial infarction, what indicates the mortality and morbidity of the patient?

Left ventricular ejection fraction. The **Left Ventricular Ejection Fraction (LVEF)** is the single most important predictor of long-term mortality and morbidity following an acute myocardial infarction (MI). 1. **Why LVEF is the Correct Answer:** LVEF is a direct measure of the heart's systolic function and reflects the extent of myocardial damage (infarct size). A reduced LVEF (typically <40%) indicates significant ventricular dysfunction, which predisposes the patient to congestive heart failure and sudden cardiac death due to ventricular arrhythmias [1], [3]. Clinical trials have consistently shown that as LVEF decreases, the risk of post-MI complications and death increases proportionally. 2. **Why Other Options are Incorrect:** * **Ventricular Extrasystole (PVCs):** While common post-MI, isolated PVCs are not reliable independent predictors of long-term mortality unless they occur in the setting of a low LVEF [1]. * **Duration of Syncope:** Syncope may occur during an MI (due to arrhythmias or profound hypotension), but its duration does not correlate linearly with long-term prognosis or the extent of myocardial necrosis [2]. * **Percentage of Narrowness:** While coronary anatomy is important for deciding intervention (PCI/CABG), the *functional* outcome (how much muscle survived) is more critical for survival than the degree of stenosis in a vessel that has already caused an infarct. **High-Yield Clinical Pearls for NEET-PG:** * **Killip Classification:** Used to clinically risk-stratify patients with acute MI based on the severity of heart failure (Killip IV = Cardiogenic shock, highest mortality). * **Gold Standard:** Echocardiography is the most common initial tool to assess LVEF post-MI [1]. * **Sudden Cardiac Death (SCD):** Patients with LVEF ≤35% post-MI are at high risk for SCD and are often candidates for an Implantable Cardioverter Defibrillator (ICD).

Q: A 27-year-old man has a blood pressure of 170/100 mmHg. He has a prominent aortic ejection click and murmurs heard over the ribs on both sides anteriorly and over the back posteriorly. In addition, the pulses in the lower extremities are feeble, and he complains of mild claudication with exertion. What is the most likely diagnosis?

Coarctation of the aorta. The clinical presentation is a classic description of **Coarctation of the Aorta (CoA)**, a congenital narrowing of the aorta typically occurring distal to the origin of the left subclavian artery [2]. **Why Option C is Correct:** * **Hypertension in a Young Patient:** CoA is a major cause of secondary hypertension. Blood pressure is elevated in the upper extremities but low in the lower extremities. * **Radio-femoral Delay:** The "feeble pulses" in the lower extremities and "claudication" (leg pain on exertion) are due to reduced distal perfusion [2]. * **Collateral Circulation:** The murmurs heard over the ribs and back are caused by dilated intercostal arteries acting as collaterals to bypass the obstruction. * **Aortic Ejection Click:** This is frequently present because CoA is highly associated with a **Bicuspid Aortic Valve** (up to 50-85% of cases). **Why Other Options are Incorrect:** * **A. Atrial Septal Defect (ASD):** Presents with a fixed split S2 and a pulmonary flow murmur, not upper limb hypertension or rib collaterals. * **B. Aortic Stenosis:** While it features an ejection click and systolic murmur, it would cause weak pulses globally (pulsus parvus et tardus), not a differential between upper and lower limbs [1]. * **D. Cardiomyopathy:** Usually presents with signs of heart failure (dyspnea, S3 gallop) rather than localized hypertension and collateral murmurs. **High-Yield Pearls for NEET-PG:** * **X-ray Finding:** "Figure of 3" sign on chest X-ray and **rib notching** (due to pressure erosion by dilated intercostal arteries). * **Associations:** Turner Syndrome and Bicuspid Aortic Valve [2]. * **Gold Standard Diagnosis:** CT Angiography or Cardiac MRI. * **Physical Exam:** Always check for **radio-femoral delay** in any young patient with hypertension [2].

Q: Which of the following is NOT a diagnostic criterion for Infective Endocarditis?

Raised ESR. The diagnosis of Infective Endocarditis (IE) is based on the **Modified Duke Criteria**, which categorizes findings into Major and Minor criteria [1]. ### **Why "Raised ESR" is the Correct Answer** While an elevated Erythrocyte Sedimentation Rate (ESR) is a very common finding in patients with IE (occurring in approximately 90% of cases), it is **not** part of the Modified Duke Criteria [2]. ESR is a highly sensitive but non-specific marker of inflammation; it can be raised in various infections, malignancies, and autoimmune conditions, making it unreliable for the specific diagnosis of endocarditis. ### **Analysis of Other Options** * **A. Positive Echocardiogram:** This is a **Major Criterion** [1]. Diagnostic findings include an oscillating intracardiac mass (vegetation), abscess, new partial dehiscence of a prosthetic valve, or new valvular regurgitation. * **B. Positive Blood Culture:** This is a **Major Criterion** [1]. It requires typical microorganisms (e.g., *S. viridans*, *S. aureus*, HACEK group) from two separate blood cultures or persistently positive cultures for other organisms. * **C. Positive Rheumatoid Factor (RF):** This is a **Minor Criterion** [1]. Immunological phenomena, including RF, glomerulonephritis, Osler’s nodes, and Roth spots, are specific components used to satisfy the Duke Criteria. ### **High-Yield Clinical Pearls for NEET-PG** * **Definite IE Diagnosis:** Requires 2 Major OR 1 Major + 3 Minor OR 5 Minor criteria [1]. * **Most Common Cause:** *Staphylococcus aureus* is now the most common cause globally (especially acute IE); *Streptococcus viridans* is common in subacute IE following dental procedures. * **IV Drug Users:** Most commonly affects the **Tricuspid Valve**; the most common organism is *S. aureus*. * **Culture-Negative IE:** Most commonly caused by previous antibiotic use or fastidious organisms like *Coxiella burnetii* (Q fever) and *Bartonella*.

Q: Which of the following medications would be prescribed most frequently to patients suffering from chronic atrial fibrillation?

Warfarin. **Explanation:** In **chronic atrial fibrillation (AF)**, the primary clinical concern is not just rate or rhythm control, but the prevention of **thromboembolism**. Due to the ineffective contraction of the atria, blood stasis occurs (particularly in the left atrial appendage), leading to the formation of mural thrombi. These thrombi can embolize, causing ischemic strokes. Therefore, long-term anticoagulation with **Warfarin** (a Vitamin K antagonist) or DOACs (Direct Oral Anticoagulants) is the mainstay of management to reduce stroke risk. **Analysis of Incorrect Options:** * **A. Lidocaine:** This is a Class IB antiarrhythmic used primarily for acute **ventricular arrhythmias** (e.g., post-MI). It has no role in atrial arrhythmias because it binds preferentially to sodium channels in ventricular tissues. * **B. Bretylium:** A Class III antiarrhythmic previously used for refractory ventricular fibrillation. It is rarely used today due to its side effect profile (severe hypotension) and is not indicated for chronic AF. * **D. Adenosine:** This drug is the treatment of choice for terminating **Paroxysmal Supraventricular Tachycardia (PSVT)**. It works by transiently blocking the AV node but has an extremely short half-life (seconds) and is not used for chronic management of AF. **NEET-PG High-Yield Pearls:** * **CHADS₂ / CHA₂DS₂-VASc Score:** Used to determine the necessity of anticoagulation in AF patients. * **Target INR:** For a patient on Warfarin for AF, the target INR is typically **2.0–3.0**. * **Drug of Choice for Rate Control:** Beta-blockers or Calcium Channel Blockers (Verapamil/Diltiazem). * **Drug of Choice for Rhythm Control:** Amiodarone or Flecainide (if no structural heart disease).

Question 1

A 70-year-old man with a prior anterior myocardial infarction presents for routine evaluation. He feels well and has no symptoms. He is taking metoprolol 100 mg bid, aspirin 81 mg od, enalapril 10 mg bid, and simvastatin 40 mg od for secondary prevention. Select the characteristic ECG finding for this patient.

Accepted Answer

Prolonged PR interval

Answer

Broad-notched P wave in lead II

Answer

Short QT interval

Answer

Short PR interval

Question 2

Which of the following statements regarding bicuspid aortic valves (BAV) is FALSE?

Accepted Answer

BAVs are associated with aortic dilatation and aneurysm formation, but there is no increased risk of rupture or dissection.

Answer

BAVs are one of the most common congenital cardiac abnormalities with a prevalence in the general population of up to 2%.

Answer

Patients with BAV often need aortic valve intervention at an earlier age than those with tricuspid aortic valves.

Answer

They are commonly associated with coarctation of the aorta (up to 50%).

Question 3

Dicrotic pulse differs from pulse bisferiens in which characteristic?

Accepted Answer

Characterized by two palpable weak waves, one in systole and another in diastole

Answer

Seen in hypertrophic obstructive cardiomyopathy (HOCM)

Answer

Indicates high stroke output

Answer

Characterized by two palpable weak waves, both in systole

Question 4

Which of the following is NOT an ECG finding in Wolff-Parkinson-White syndrome?

Accepted Answer

Narrow QRS complexes

Answer

Normal QT interval

Answer

Slurred and tall QRS (delta wave)

Answer

Short PR interval

Question 5

A 50-year-old man with aortic stenosis is exercising for 11 minutes according to the Bruce protocol. Exercise stopped due to fatigue, and the transaortic pressure gradient is 60 mm Hg. What is the best management?

Accepted Answer

Observation

Answer

Angiogram

Answer

Aortic valve replacement

Answer

Aortic balloon valvuloplasty

Question 6

All of the following may be seen in a patient with cardiac tamponade, except?

Accepted Answer

Kussmaul's sign

Answer

Pulsus paradoxus

Answer

Electrical alternans

Answer

Right ventricular diastolic collapse on echocardiogram

Question 7

Following an attack of myocardial infarction, what indicates the mortality and morbidity of the patient?

Accepted Answer

Left ventricular ejection fraction

Answer

Ventricular extrasystole

Answer

Duration of syncope

Answer

Percentage of narrowness of coronary artery

Question 8

A 27-year-old man has a blood pressure of 170/100 mmHg. He has a prominent aortic ejection click and murmurs heard over the ribs on both sides anteriorly and over the back posteriorly. In addition, the pulses in the lower extremities are feeble, and he complains of mild claudication with exertion. What is the most likely diagnosis?

Accepted Answer

Coarctation of the aorta

Answer

Atrial septal defect

Answer

Aortic stenosis

Answer

Cardiomyopathy

Question 9

Which of the following is NOT a diagnostic criterion for Infective Endocarditis?

Accepted Answer

Raised ESR

Answer

Positive Echocardiogram

Answer

Positive Blood culture

Answer

Positive Rheumatoid Factor

Question 10

Which of the following medications would be prescribed most frequently to patients suffering from chronic atrial fibrillation?

Accepted Answer

Warfarin

Answer

Lidocaine

Answer

Bretylium

Answer

Adenosine

Cardiology — MCQs

Cardiology — MCQs

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