Cardiology Practice Questions

Q: A 42-year-old smoker has developed an acute anterior wall myocardial infarction. Which of the following coronary arteries is most likely to show obstruction?

Left anterior descending artery. ### Explanation **Correct Option: A. Left Anterior Descending Artery (LAD)** The **Left Anterior Descending (LAD)** artery is the primary blood supply to the anterior wall of the left ventricle and the anterior two-thirds of the interventricular septum. In clinical practice, the LAD is the most commonly occluded vessel in myocardial infarction (MI). Obstruction of this artery leads to an **Anterior Wall MI**, typically characterized by ST-segment elevation in leads **V1 to V4** on an ECG [1]. **Incorrect Options:** * **B. Left Posterior Descending Artery (PDA):** This artery supplies the posterior and inferior walls of the heart [2]. Occlusion results in an Inferior or Posterior MI. * **C. Right Coronary Artery (RCA):** In 85% of individuals (right-dominant circulation), the RCA gives rise to the PDA. Obstruction usually leads to an **Inferior Wall MI** (leads II, III, aVF) and may involve the Right Ventricle. * **D. Circumflex Artery (LCx):** The LCx supplies the lateral wall of the left ventricle. Obstruction leads to a **Lateral Wall MI**, seen in leads I, aVL, V5, and V6 [3]. **High-Yield Clinical Pearls for NEET-PG:** * **"The Widow Maker":** The LAD is often referred to by this name due to the high mortality associated with its occlusion. * **ECG Correlation:** * Anterior Wall: V1–V4 (LAD) [1] * Septal: V1–V2 (LAD) * Lateral Wall: I, aVL, V5, V6 (LCx) * Inferior Wall: II, III, aVF (RCA > LCx) * **Most Common Site of MI:** LAD (40–50%) > RCA (30–40%) > LCx (15–20%). * **Papillary Muscle Rupture:** While the anterolateral papillary muscle has dual supply (LAD/LCx), the **posteromedial** papillary muscle is supplied solely by the PDA (usually RCA), making it more susceptible to rupture post-MI.

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

Aortic regurgitation. **Explanation:** **Water hammer pulse** (also known as Corrigan’s pulse or collapsing pulse) is a clinical sign characterized by a rapid, forceful upstroke followed by a sudden, rapid collapse [1]. **Why Aortic Regurgitation (AR) is correct:** In AR, the stroke volume is increased because the left ventricle must pump both the normal blood volume and the blood that leaked back from the aorta during diastole. This leads to a high systolic pressure [1]. During diastole, blood rapidly flows backward into the left ventricle and forward into the peripheral circulation, causing a precipitous drop in diastolic pressure. This **widened pulse pressure** creates the characteristic "bounding" and "collapsing" sensation. **Analysis of Incorrect Options:** * **Aortic Stenosis (AS):** Characterized by a **Pulsus Parvus et Tardus** (small volume, slow-rising pulse) due to the obstructed outflow from the left ventricle. * **Aortic Stenosis and Aortic Regurgitation:** While both may coexist, the presence of AS typically "dampens" the water hammer effect of AR, leading to a "bisferiens pulse" (double-peaked pulse). * **Mitral Regurgitation:** Usually presents with a normal or slightly reduced pulse volume; it does not cause the massive diastolic pressure drop seen in AR. **High-Yield Clinical Pearls for NEET-PG:** * **Maneuver:** To best elicit a water hammer pulse, palpate the radial artery with the palm of your hand while **elevating the patient's arm** above the level of the heart. * **Associated Signs of AR:** * **De Musset’s sign:** Head nodding with each heartbeat [1]. * **Quincke’s sign:** Capillary pulsations in the nail bed. * **Traube’s sign:** "Pistol shot" sounds heard over the femoral artery. * **Duroziez’s sign:** Systolic and diastolic murmurs heard over the femoral artery when compressed.

Q: Which of the following is not a first-line antihypertensive medication?

Atenolol. The correct answer is **Atenolol**. According to current clinical guidelines (JNC 8 and AHA/ACC), **Beta-blockers** are no longer considered first-line agents for the management of primary hypertension in the absence of specific compelling indications (like post-MI or heart failure) [1, 2]. **Why Atenolol is the correct answer:** Clinical trials (such as the ASCOT-BPLA) demonstrated that Beta-blockers, particularly Atenolol, are less effective than other classes in preventing stroke and cardiovascular mortality [2]. They are also associated with an increased risk of new-onset diabetes and are less effective at reducing central aortic pressure compared to peripheral blood pressure. **Why the other options are incorrect:** * **Enalapril (ACE Inhibitor):** ACE inhibitors are first-line agents, especially beneficial in patients with diabetes or chronic kidney disease due to their renoprotective effects. * **Hydrochlorothiazide (Thiazide Diuretic):** Thiazides have long been a cornerstone of first-line therapy, proven to reduce cardiovascular morbidity and mortality effectively [3]. * **Amlodipine (Calcium Channel Blocker):** Dihydropyridine CCBs are highly effective first-line agents, particularly recommended for elderly patients and those of African descent. **High-Yield Clinical Pearls for NEET-PG:** * **First-line ABCD:** **A**CEIs/ARBs, **B**-blockers (only if compelling indications), **C**CBs, and **D**iuretics. * **Compelling Indications for Beta-blockers:** Stable angina, post-Myocardial Infarction, and Heart Failure with reduced Ejection Fraction (HFrEF) [2]. * **Side Effect Note:** Avoid Thiazides in patients with gout (hyperuricemia) and ACEIs in pregnancy (teratogenic).

Q: A 70-year-old male with a history of hypertension and diabetes mellitus developed the following rhythm with a blood pressure of 90/40 mm Hg and a feeble pulse. What is the next step in management?

Unsynchronized defibrillation. ***Unsynchronized defibrillation*** - **Hemodynamic instability** (BP 90/40 mm Hg, feeble pulse) mandates immediate **electrical therapy** per ACLS guidelines. - For the displayed rhythm (ventricular flutter or very rapid ventricular tachycardia), an **unsynchronized high-energy shock (defibrillation)** is indicated because a discrete QRS complex may not be identifiable for synchronization. **Synchronized cardioversion** is reserved for rhythms with identifiable QRS complexes (e.g., stable monomorphic VT, SVT, atrial fibrillation/flutter); **unsynchronized defibrillation** is used when synchronization is not possible due to the nature of the rhythm. *IV adenosine* - **Adenosine** is used for stable **supraventricular tachycardia** (SVT) but should not delay immediate electrical therapy in this hemodynamically unstable patient. - The patient's **hypotension** and **feeble pulse** indicate the need for immediate electrical intervention, not pharmacological agents. *IV diltiazem* - **Diltiazem** is a calcium channel blocker that can worsen **hypotension** and is inappropriate in unstable patients. - Used for **rate control** in stable atrial fibrillation/flutter, but contraindicated when hemodynamic compromise is present. *Ibutilide* - **Ibutilide** is an antiarrhythmic used for **chemical cardioversion** of stable atrial fibrillation/flutter. - Takes time to work and is inappropriate for **hemodynamically unstable** patients who require immediate electrical cardioversion.

Q: A patient with VSD develops pulmonary hypertension. What is the characteristic feature?

Cyanosis. When a patient with a large Ventricular Septal Defect (VSD) develops severe pulmonary hypertension, it leads to **Eisengmenger Syndrome**. This occurs because the chronic left-to-right shunt causes structural remodeling of the pulmonary vasculature, increasing pulmonary vascular resistance (PVR). Once PVR exceeds systemic vascular resistance, the shunt **reverses** (becomes right-to-left) [1]. Deoxygenated blood enters the systemic circulation, leading to **differential cyanosis** and clubbing [1]. **Analysis of Options:** * **Cyanosis (Correct):** This is the hallmark of shunt reversal (Eisengerization). It signifies that the pulmonary pressures have reached systemic levels, making the VSD "silent" or "balanced." * **Ejection systolic murmur (Incorrect):** While a pulmonary flow murmur may exist, the characteristic **pansystolic murmur** of the VSD actually **disappears** as the pressure gradient between the ventricles equalizes. * **Inverted T-wave (Incorrect):** While ECG changes like Right Ventricular Hypertrophy (RVH) and Right Axis Deviation are common, T-wave inversion is non-specific and not the "characteristic" clinical feature of the transition to Eisenmenger syndrome. * **Clubbing (Incorrect):** While clubbing occurs in Eisenmenger syndrome, it is a *sequela* of chronic hypoxia. In the context of NEET-PG questions regarding the "development" of pulmonary hypertension in VSD, **cyanosis** is the primary clinical sign of the shunt reversal. **High-Yield Clinical Pearls:** 1. **The "Silent" VSD:** As pulmonary hypertension worsens, the loud pansystolic murmur of a small VSD softens and eventually vanishes. 2. **Physical Exam:** Look for a palpable P2, a loud/accentuated S2, and a Graham-Steell murmur (pulmonary regurgitation). 3. **Contraindication:** Once Eisenmenger syndrome is established, surgical closure of the VSD is **strictly contraindicated** as the defect now acts as a pressure-release valve for the right heart [2].

Q: A 58-year-old woman presents for routine cardiac follow-up. Transthoracic echocardiography is performed. Color Doppler imaging shows a mitral regurgitation jet occupying 20–29% of the left atrial area. The vena contracta width measures 0.4 cm. The effective regurgitant orifice area (EROA) is 0.25 cm², and the regurgitant volume is 38 mL. The left atrium is mildly enlarged. Pulmonary vein flow shows blunted systolic filling. There is no evidence of severe left ventricular dilation. What is the severity of mitral regurgitation?

Moderate MR. Using an integrated grading framework (ASE/ACC/AHA guidelines), mitral regurgitation severity is assessed by combining qualitative, semi-quantitative, and quantitative parameters. In this case: (1) Color Doppler jet area occupies 20–29% of the left atrial area — consistent with moderate MR (mild <20%, severe ≥40%). (2) Vena contracta width of 0.4 cm falls in the moderate range (mild <0.3 cm, severe ≥0.7 cm). (3) EROA of 0.25 cm² is consistent with moderate MR (mild <0.20 cm², severe ≥0.40 cm²). (4) Regurgitant volume of 38 mL is in the moderate range (mild <30 mL, severe ≥60 mL). (5) Mild left atrial enlargement and blunted pulmonary vein systolic flow are supportive findings consistent with moderate hemodynamic burden. Taken together, these parameters satisfy the integrated criteria for moderate mitral regurgitation. Severe MR would require EROA ≥0.40 cm², regurgitant volume ≥60 mL, vena contracta ≥0.7 cm, and/or systolic flow reversal in pulmonary veins. Mild MR would show smaller jet area, vena contracta <0.3 cm, and regurgitant volume <30 mL. Trivial MR shows only a small, brief jet with no hemodynamic significance.

Q: Pulsus paradoxus is not seen in:

Hypertrophic cardiomyopathy. **Explanation:** **Pulsus paradoxus** is defined as an exaggerated fall in systolic blood pressure (>10 mmHg) during inspiration. Under normal physiological conditions, inspiration increases venous return to the right heart, causing the interventricular septum to bulge slightly into the left ventricle (LV), minimally reducing stroke volume. **Why Hypertrophic Cardiomyopathy (HCM) is the correct answer:** In HCM, the primary pathology is a thickened, non-compliant ventricle [2]. While it involves diastolic dysfunction, it does not typically exhibit the "ventricular interdependence" seen in tamponade. More importantly, HCM is classically associated with **Pulsus Bisferiens** (a double-peaked systolic pulse), not pulsus paradoxus. **Analysis of Incorrect Options:** * **Cardiac Tamponade:** The classic cause. Fluid in the pericardial sac creates a "fixed volume" system [1]. Increased right heart filling during inspiration forces the septum to shift significantly toward the LV, severely compromising LV filling and stroke volume. * **Constrictive Pericarditis:** Though less common than in tamponade (seen in ~30% of cases), it can occur due to the rigid pericardium limiting total cardiac volume. * **Severe COPD/Asthma:** Large negative intrathoracic pressure during inspiration increases the pooling of blood in pulmonary capacitance vessels and increases LV afterload, leading to a drop in systolic BP. **High-Yield Clinical Pearls for NEET-PG:** * **Kussmaul’s Sign:** A paradoxical rise in JVP on inspiration. It is seen in **Constrictive Pericarditis** but characteristically **absent** in Cardiac Tamponade. * **Reverse Pulsus Paradoxus:** Seen in Hypertrophic Obstructive Cardiomyopathy (HOCM) during positive pressure ventilation. * **Beck’s Triad (Tamponade):** Hypotension, JVD, and muffled heart sounds [1].

Q: A patient with a moderate ventricular septal defect (VSD) in chronic congestive heart failure (CCF) develops clubbing without cyanosis. What is the most likely diagnosis?

Subacute bacterial endocarditis. **Explanation:** The presence of **clubbing without cyanosis** in a patient with a known Ventricular Septal Defect (VSD) is a classic clinical sign of **Infective Endocarditis (IE)** [1], specifically the subacute form. **1. Why Subacute Bacterial Endocarditis (SBE) is correct:** In patients with VSD, the high-velocity jet of blood through the defect causes endothelial damage, creating a nidus for bacterial vegetation. Clubbing in SBE is a peripheral stigmata of the disease, likely resulting from chronic inflammation, circulating immune complexes, and micro-emboli [1]. Since the shunt remains left-to-right (no Eisenmengerization yet), the patient remains acyanotic. **2. Why the other options are incorrect:** * **Shunt Reversal (Eisenmenger Syndrome):** This occurs when pulmonary hypertension leads to a right-to-left shunt [2]. While this causes clubbing, it **must** be accompanied by central cyanosis [2], [3]. * **Long-standing Pulmonary Edema:** Chronic CCF and pulmonary edema cause dyspnea and rales but are not recognized causes of digital clubbing. * **Pulmonary Arterial Hypertension (PAH):** PAH itself does not cause clubbing. Clubbing only appears in this context once the pressure is high enough to reverse the shunt (Option A), which would then include cyanosis [2], [4]. **Clinical Pearls for NEET-PG:** * **The Rule of Thumb:** Clubbing + Cyanosis = Shunt Reversal (Eisenmenger’s) [2]. Clubbing + NO Cyanosis = Infective Endocarditis [1]. * **VSD & IE:** Small and moderate VSDs are at a higher risk for IE than large VSDs because the higher velocity jet causes more endothelial trauma. * **Commonest Site of IE in VSD:** Vegetations usually form on the **right ventricular side** of the defect or on the tricuspid valve due to the "jet effect." **Source Consolidation Note:** References from Davidson's Chapter 'Look up risk corresponding to total points' are consolidated where appropriate.

Question 1

A 40-year-old woman presents with a 3-year history of increasing dyspnea and fatigue. Physical examination reveals increased jugular venous pressure with prominent c-v waves, a reduced carotid pulse, a left parasternal lift, loud P2, and right-sided S3 and S4 gallops. Lung fields are clear on chest X-ray, and ECG shows evidence of right ventricular hypertrophy. Pulmonary function tests show a slight restrictive pattern. Primary pulmonary hypertension is suspected. Which of the following is the most appropriate diagnostic test to confirm the diagnosis?

Accepted Answer

Cardiac catheterization

Answer

Open lung biopsy

Answer

Pulmonary angiography

Answer

Noninvasive exercise testing

Question 2

A 42-year-old smoker has developed an acute anterior wall myocardial infarction. Which of the following coronary arteries is most likely to show obstruction?

Accepted Answer

Left anterior descending artery

Answer

Left posterior descending artery

Answer

Right coronary artery

Answer

Circumflex artery

Question 3

Water hammer pulse is seen in which of the following conditions?

Accepted Answer

Aortic regurgitation

Answer

Aortic stenosis

Answer

Aortic stenosis and aortic regurgitation

Answer

Mitral regurgitation

Question 4

Which of the following is not a first-line antihypertensive medication?

Accepted Answer

Atenolol

Answer

Enalapril

Answer

Hydrochlorothiazide

Answer

Amlodipine

Question 5

A 70-year-old male with a history of hypertension and diabetes mellitus developed the following rhythm with a blood pressure of 90/40 mm Hg and a feeble pulse. What is the next step in management?

Accepted Answer

Unsynchronized defibrillation

Answer

IV adenosine

Answer

Ibutilide

Answer

IV diltiazem

Question 6

A patient with VSD develops pulmonary hypertension. What is the characteristic feature?

Accepted Answer

Cyanosis

Answer

Ejection systolic murmur in the pulmonary area

Answer

Inverted 'T' wave in ECG

Answer

Clubbing

Question 7

A 58-year-old woman presents for routine cardiac follow-up. Transthoracic echocardiography is performed. Color Doppler imaging shows a mitral regurgitation jet occupying 20–29% of the left atrial area. The vena contracta width measures 0.4 cm. The effective regurgitant orifice area (EROA) is 0.25 cm², and the regurgitant volume is 38 mL. The left atrium is mildly enlarged. Pulmonary vein flow shows blunted systolic filling. There is no evidence of severe left ventricular dilation. What is the severity of mitral regurgitation?

Accepted Answer

Moderate MR

Answer

Severe MR

Answer

Trivial MR

Answer

Mild MR

Question 8

Pulsus paradoxus is not seen in:

Accepted Answer

Hypertrophic cardiomyopathy

Answer

Cardiac tamponade

Answer

Constrictive pericarditis

Answer

Severe COPD

Question 9

A patient with a moderate ventricular septal defect (VSD) in chronic congestive heart failure (CCF) develops clubbing without cyanosis. What is the most likely diagnosis?

Accepted Answer

Subacute bacterial endocarditis

Answer

Shunt reversal

Answer

Long-standing pulmonary edema

Answer

Pulmonary arterial hypertension

Question 10

A 20-year-old man presents for a routine examination. He is afebrile and has clear breath sounds. Cardiac examination reveals a mid to late diastolic murmur, loudest at the cardiac apex. What is the most likely cause of this murmur?

Accepted Answer

Rheumatic fever

Answer

Acute pericarditis

Answer

Congenital heart defect

Answer

Infective endocarditis

Cardiology — MCQs

Cardiology — MCQs

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