Cardiology — MCQs

A 78-year-old woman presents with an acute anterior wall myocardial infarction, accompanied by hypotension and pulmonary congestion. Her blood pressure is 90/70 mm Hg, pulse is 110/min, JVP is at 8 cm, and heart sounds are normal. The lungs exhibit bibasilar crackles, and her extremities are cool and diaphoretic. What would central hemodynamic monitoring most likely reveal in this patient?

Cardiology Indian Medical PG Practice Questions and MCQs

Question 1131: Radiofemoral delay is characteristic of which of the following conditions?

A. Patent ductus arteriosus
B. Coarctation of the aorta (Correct Answer)
C. Aortic dissection
D. Takayasu's arteritis

Explanation: ### Explanation **Correct Option: B. Coarctation of the aorta** **Mechanism:** Radiofemoral delay refers to a perceptible lag between the radial and femoral pulses when palpated simultaneously. In **Coarctation of the Aorta**, there is a congenital narrowing of the aortic lumen, typically distal to the origin of the left subclavian artery (post-ductal) [1]. This obstruction creates a high-pressure zone proximally (supplying the arms) and a low-pressure zone distally (supplying the legs). The blood flow to the lower limbs is delayed and dampened as it passes through the narrowing or via collateral circulation, resulting in a femoral pulse that is **weak and delayed** compared to the radial pulse [1]. **Analysis of Incorrect Options:** * **A. Patent Ductus Arteriosus (PDA):** Characterized by a "machinery murmur" and **bounding pulses** (water-hammer pulse) due to a large stroke volume and rapid diastolic runoff into the pulmonary artery [1]. There is no delay between upper and lower limb pulses. * **C. Aortic Dissection:** Typically presents with **asymmetry or absence of pulses** (e.g., right radial vs. left radial) depending on which branch vessels are involved by the dissecting flap, rather than a classic radiofemoral delay [2]. * **D. Takayasu’s Arteritis:** Known as "pulseless disease," it involves granulomatous inflammation of the aortic arch and its branches. It usually causes **absent or diminished pulses** in the upper limbs or discrepancy between the two arms, rather than a classic radiofemoral delay. **High-Yield Clinical Pearls for NEET-PG:** * **Physical Exam Triad for Coarctation:** Hypertension in upper limbs, hypotension in lower limbs, and radiofemoral delay [1]. * **Chest X-ray findings:** "Figure of 3" sign (aorta) and **Rib notching** (due to dilated intercostal collaterals; usually involves 3rd to 8th ribs). * **Association:** Strongly associated with **Turner Syndrome** (3-10% of cases) and **Bicuspid Aortic Valve** (up to 50-80% of cases) [1]. * **Mnemonic:** "3" sign on X-ray = Coarctation of Aorta.

Question 1132: Which of the following is the best predictor for future risk of cardiovascular events?

A. High-sensitivity C-reactive protein (hs-CRP) (Correct Answer)
B. Interleukin 6 (IL-6)
C. Lipoprotein 'a' (Lp(a))
D. Homocysteine

Explanation: ### Explanation **Correct Answer: A. High-sensitivity C-reactive protein (hs-CRP)** **Why hs-CRP is the best predictor:** Atherosclerosis is now recognized as a chronic inflammatory process rather than just a lipid-storage disease [1]. Among various inflammatory markers, **hs-CRP** is the most extensively validated and standardized biomarker for predicting future cardiovascular (CV) events (MI, stroke, and peripheral vascular disease). * **Mechanism:** It reflects the level of low-grade systemic inflammation associated with plaque instability. Vulnerable plaques are characterized by a lipid-rich core and an increase in inflammatory cells that release enzymes to degrade matrix proteins [1]. * **Clinical Utility:** Unlike standard CRP, the "high-sensitivity" assay can detect minute elevations (below 3 mg/L) in asymptomatic individuals. According to the CDC/AHA guidelines, hs-CRP levels **>3 mg/L** indicate high vascular risk, even in patients with normal LDL levels. **Analysis of Incorrect Options:** * **B. Interleukin 6 (IL-6):** While IL-6 is the primary driver of CRP production in the liver, it has a very short half-life and high analytical variability, making it clinically unreliable compared to the stable hs-CRP. * **C. Lipoprotein 'a' (Lp(a)):** This is a genetically determined risk factor. While high levels correlate with CV risk, it is considered an "independent risk factor" rather than a superior "predictor" of global events compared to the inflammatory signal of hs-CRP. * **D. Homocysteine:** Elevated levels (Hyperhomocysteinemia) are associated with endothelial damage. However, clinical trials (like the HOPE-2 trial) showed that lowering homocysteine with B-vitamins does not reduce CV events, making it a weak predictor. **High-Yield Facts for NEET-PG:** * **JUPITER Trial:** Demonstrated that Statin therapy reduces CV events in patients with low LDL but **high hs-CRP**. * **Risk Stratification (hs-CRP):** * <1 mg/L: Low Risk * 1–3 mg/L: Average Risk * >3 mg/L: High Risk * **Note:** If hs-CRP is >10 mg/L, look for an acute infection or non-cardiac inflammation rather than chronic vascular risk [2].

Question 1133: Which one of the following is an absolute contraindication to the use of a thrombolytic agent in the setting of an acute anterior wall myocardial infarction?

A. History of cerebrovascular accident with hemiparesis one month ago (Correct Answer)
B. Diabetic retinopathy
C. Patient's age more than 70 years
D. Patient is on warfarin for atrial fibrillation with INR ratio 1.8

Explanation: In the management of ST-Elevation Myocardial Infarction (STEMI), thrombolytic therapy is a life-saving intervention but carries a significant risk of intracranial hemorrhage (ICH) [1]. Contraindications are strictly divided into **Absolute** and **Relative**. ### Why Option A is Correct **History of ischemic stroke within the last 3 months** is an **absolute contraindication**. A cerebrovascular accident (CVA) occurring only one month ago indicates a high risk of hemorrhagic transformation or re-bleeding at the site of the previous infarct. Any history of prior intracranial hemorrhage (at any time) or a known structural cerebrovascular lesion (e.g., AV malformation) are also absolute contraindications. ### Why Other Options are Incorrect * **B. Diabetic Retinopathy:** This is a **relative contraindication**. While there is a theoretical risk of vitreous hemorrhage, the benefit of treating an anterior wall MI usually outweighs this risk. * **C. Age > 70 years:** Advanced age (typically >75) is a **relative contraindication**. While the risk of ICH increases with age, it does not strictly prohibit thrombolysis if primary PCI is unavailable. * **D. Warfarin use (INR 1.8):** Current use of anticoagulants is a **relative contraindication**. An INR >1.7 is generally the threshold where caution is advised, but it is not an absolute bar to therapy in a life-threatening MI. ### NEET-PG High-Yield Pearls * **Absolute Contraindications (The "Never" List):** 1. Any prior Intracranial Hemorrhage (ICH). 2. Ischemic stroke within 3 months. 3. Known intracranial neoplasm or structural lesion. 4. Active internal bleeding (excluding menses). 5. Suspected Aortic Dissection. 6. Significant closed-head or facial trauma within 3 months. * **Time Window:** Thrombolysis is most effective within the first **12 hours** of symptom onset (ideally within the "Golden Hour") [1], [2]. * **Preferred Agent:** Fibrin-specific agents (Tenecteplase, Reteplase) are preferred over Streptokinase due to better patency rates and lower systemic bleeding [2].

Question 1134: A 50-year-old man was recently diagnosed with coronary artery disease. There were no added risk factors except for an LDL value of 150-165 mg/dL. What is the single most appropriate drug for initial therapy?

A. Gemfibrozil
B. Nicotinic acid
C. Bile acid binding resins
D. Statins (Correct Answer)

Explanation: **Explanation:** The primary goal in managing a patient with established **Coronary Artery Disease (CAD)** is the aggressive reduction of LDL cholesterol to prevent future major adverse cardiovascular events (MACE). **1. Why Statins are the Correct Choice:** Statins (HMG-CoA reductase inhibitors) are the **first-line therapy** for lipid management in CAD [4]. They are the only class of lipid-lowering drugs proven to significantly reduce both morbidity and mortality in secondary prevention [1]. Beyond lowering LDL, statins possess **pleiotropic effects**, such as stabilizing atherosclerotic plaques, improving endothelial function, and reducing vascular inflammation [1]. For a patient with CAD and an LDL of 150-165 mg/dL, high-intensity statin therapy (e.g., Atorvastatin 40-80 mg or Rosuvastatin 20-40 mg) is indicated regardless of the baseline LDL level [2]. **2. Why Other Options are Incorrect:** * **Gemfibrozil (Fibrates):** These are primarily used to lower triglycerides and have a minimal effect on LDL [3]. They do not provide the same cardiovascular mortality benefit as statins in CAD patients [3]. * **Nicotinic Acid (Niacin):** While it increases HDL and lowers LDL, large clinical trials (AIM-HIGH, HPS2-THRIVE) failed to show incremental clinical benefit when added to statins, and it carries a high side-effect profile (flushing, hyperglycemia) [3]. * **Bile Acid Binding Resins (e.g., Cholestyramine):** These are less potent than statins and are often poorly tolerated due to GI side effects. They are generally reserved as adjunct therapy if LDL targets are not met with statins and Ezetimibe [3]. **Clinical Pearls for NEET-PG:** * **Target LDL in CAD:** According to recent guidelines, the target LDL for "Very High Risk" patients (like those with CAD) is **<55 mg/dL**. * **Side Effects:** Monitor for **myopathy/rhabdomyolysis** (check CK if symptomatic) and **hepatotoxicity** (check LFTs if symptomatic) [1]. * **Rule of 6:** Each doubling of the statin dose leads to an additional 6% reduction in LDL levels.

Question 1135: A patient with heart failure developed recurrent sustained monomorphic ventricular tachycardia. What is/are the appropriate treatment(s)?

A. Encainide
B. Flecainide
C. Implantable Cardioverter-Defibrillator (Correct Answer)
D. Beta-blockers

Explanation: **Explanation:** The primary goal in managing a patient with heart failure (HF) and recurrent sustained monomorphic ventricular tachycardia (VT) is the prevention of **Sudden Cardiac Death (SCD)**. **Why ICD is the Correct Answer:** According to current guidelines (ACC/AHA/ESC), an **Implantable Cardioverter-Defibrillator (ICD)** is the treatment of choice for **secondary prevention** of SCD in patients who have experienced sustained VT, especially in the setting of structural heart disease like heart failure [1]. While drugs may reduce the frequency of episodes, only the ICD has been proven to significantly improve survival by providing immediate internal cardioversion/defibrillation during life-threatening arrhythmias [1]. **Analysis of Incorrect Options:** * **A & B (Encainide and Flecainide):** These are Class 1C antiarrhythmics. The landmark **CAST (Cardiac Arrhythmia Suppression Trial)** proved that these drugs actually *increase* mortality in patients with prior myocardial infarction or structural heart disease due to their potent **pro-arrhythmic effects**. They are strictly contraindicated in heart failure. * **D (Beta-blockers):** While beta-blockers are a cornerstone of heart failure therapy and help reduce the burden of VT, they are generally insufficient as a standalone treatment for *recurrent sustained* VT [1]. They are used as adjunctive therapy alongside an ICD. **High-Yield Clinical Pearls for NEET-PG:** * **Amiodarone** is the preferred antiarrhythmic drug for VT in heart failure patients if an ICD is not feasible or to reduce frequent ICD shocks, as it is "neutral" regarding mortality. * **Class 1C drugs** (Flecainide, Propafenone) are for "Normal Hearts" only. * **Primary Prevention:** ICD is also indicated in HF patients with an Ejection Fraction (EF) ≤ 35% and NYHA Class II/III symptoms despite optimal medical therapy [1].

Question 1136: In a patient with mitral stenosis, disappearance of Loud S1 is associated with all except?

A. Calcified valve
B. Aortic regurgitation
C. Heart block
D. Mild mitral stenosis (Correct Answer)

Explanation: Explanation: In **Mitral Stenosis (MS)**, a **Loud S1** (tapping S1) is a hallmark finding [1]. It occurs because the thickened but mobile mitral leaflets are wide apart at the end of diastole and shut abruptly with high pressure. The disappearance of this loud S1 indicates that the valve is either too rigid to snap shut or that other physiological factors are interfering with its closure. **Why "Mild Mitral Stenosis" is the correct answer:** In **Mild MS**, the valve leaflets remain mobile and the pressure gradient is sufficient to snap them shut forcefully, resulting in a **Loud S1**. As MS progresses to a "tight" or "severe" stage with significant calcification, the S1 becomes soft or muffled [2]. Therefore, mild MS is associated with the *presence* of a loud S1, not its disappearance. **Analysis of Incorrect Options:** * **A. Calcified Valve:** When the mitral valve becomes heavily calcified and immobile, it can no longer "snap" shut. This leads to a soft or absent S1 and is also associated with the disappearance of the Opening Snap (OS) [2]. * **B. Aortic Regurgitation (AR):** Co-existing AR (specifically the Austin Flint phenomenon) or the rapid rise in left ventricular pressure can cause the mitral valve to close prematurely or less forcefully, softening the S1. * **C. Heart Block:** In First-degree Heart Block (prolonged PR interval), the mitral leaflets have more time to float back toward a closed position before ventricular systole begins. Consequently, they close from a shorter distance, resulting in a soft S1. **Clinical Pearls for NEET-PG:** * **Loud S1 + Opening Snap:** Indicates a mobile, non-calcified mitral valve [1]. * **Soft S1 in MS:** Suggests a rigid, calcified valve or severe subvalvular thickening [2]. * **The "Rule of S1":** S1 is loud in MS, short PR interval, and hyperdynamic states (tachycardia). S1 is soft in MR, long PR interval (1st-degree block), and severe/calcified MS.

Question 1137: All of the following are features of Mobitz type I block except?

A. Constant PR interval (Correct Answer)
B. Normal QRS morphology
C. Regular atrial rhythm
D. Atrial rate equals ventricular rate

Explanation: **Explanation:** Mobitz Type I (Wenckebach) is a second-degree AV block characterized by a progressive delay in conduction at the AV node [1]. **Why Option A is the Correct Answer:** In Mobitz Type I, the hallmark feature is a **progressive prolongation of the PR interval** in successive beats until a P-wave is completely blocked (dropped QRS) [1]. Therefore, a **constant PR interval** is not a feature of Mobitz Type I; rather, it is characteristic of Mobitz Type II or First-degree AV block [1]. **Analysis of Other Options:** * **B. Normal QRS morphology:** Since the block occurs within the AV node (proximal to the Bundle of His), the ventricular conduction remains normal [1]. Thus, the QRS complex is typically narrow (<0.12s). * **C. Regular atrial rhythm:** The SA node fires normally, resulting in a constant P-P interval [1]. The "irregularity" of the pulse is purely due to the intermittent failure of AV conduction. * **D. Atrial rate equals ventricular rate:** This is the **incorrect** statement in the context of the question's logic (though the question asks for "except"). In any second-degree block, there are more P waves than QRS complexes (e.g., 3:2 or 4:3 conduction), meaning the **atrial rate is faster than the ventricular rate.** *(Note: In standard medical exams, if multiple options seem incorrect, the most defining physiological mismatch—like the PR interval behavior—is the intended answer.)* **High-Yield Clinical Pearls for NEET-PG:** * **Site of Block:** Usually the AV Node [1]. * **Vagal Tone:** Increased vagal tone (e.g., in athletes or during sleep) can cause Mobitz I [1]. It often improves with atropine or exercise. * **Prognosis:** Generally benign and rarely progresses to complete heart block [1]. * **Wenckebach Phenomenon:** Characterized by "group beating" and a progressive shortening of the R-R interval before the dropped beat.

Question 1138: What ECG change is seen in hypocalcemia?

A. QT prolongation (Correct Answer)
B. Prolonged PR interval
C. Shortened PR interval
D. QT Shortening

Explanation: ### Explanation **Correct Option: A. QT prolongation** **Mechanism:** The QT interval on an ECG represents the total duration of ventricular depolarization and repolarization. In **hypocalcemia**, the low extracellular calcium levels lead to a **prolongation of Phase 2 (the plateau phase)** of the cardiac action potential. During this phase, the inward movement of calcium through L-type calcium channels is slowed, delaying the onset of repolarization. On the ECG, this specifically manifests as a **prolonged ST segment**, which results in an overall **prolongation of the QT interval**. **Analysis of Incorrect Options:** * **B & C (PR Interval changes):** The PR interval reflects AV nodal conduction [3]. While hyperkalemia or certain drugs (like Beta-blockers) can prolong the PR interval [1], and conditions like WPW syndrome shorten it [3], calcium levels do not primarily affect the PR interval. * **D (QT Shortening):** This is the classic ECG finding in **hypercalcemia**. High calcium levels shorten the plateau phase (Phase 2) and accelerate repolarization, leading to a shortened ST segment and QT interval. **High-Yield Clinical Pearls for NEET-PG:** * **Hypocalcemia:** Prolonged QT interval (specifically due to a long ST segment). T-waves usually remain normal. * **Hypercalcemia:** Shortened QT interval; may also see "Osborn waves" (though more common in hypothermia). * **Hypokalemia:** Flattened T-waves, **U-waves**, and ST-depression. * **Hyperkalemia:** Tall **tented T-waves**, widened QRS, and loss of P-waves (Sine wave pattern in severe cases) [1]. * **Clinical Correlation:** A prolonged QT interval in hypocalcemia can predispose patients to *Torsades de Pointes* [2], although this is less common than in hypomagnesemia or hypokalemia.

Question 1139: Amyloidosis of the heart presents with which of the following?

A. Arrhythmia (Correct Answer)
B. AV block
C. High voltage complexes
D. Aortic stenosis

Explanation: The explanation with , inline citations added **Explanation:** Cardiac amyloidosis is a classic cause of **Restrictive Cardiomyopathy**, characterized by the extracellular deposition of insoluble amyloid fibrils within the myocardium. **1. Why Arrhythmia is Correct:** The infiltration of amyloid fibrils disrupts the normal architecture of the heart, leading to myocardial irritability and fibrosis. This frequently results in **atrial fibrillation** (due to atrial enlargement and infiltration) and various ventricular arrhythmias. Arrhythmias are a leading cause of morbidity and sudden cardiac death in these patients. **2. Analysis of Incorrect Options:** * **AV Block:** While amyloid can infiltrate the conduction system, it more commonly presents as bundle branch blocks or sick sinus syndrome. While possible, "Arrhythmia" is a more encompassing and clinically frequent manifestation in the context of this specific question. * **High Voltage Complexes:** This is a **classic distractor**. In amyloidosis, despite the "thickened" appearance of the ventricular walls on echocardiography, the ECG typically shows **Low Voltage Complexes**. This is because the amyloid protein is electrically inert and replaces functional myocytes. * **Aortic Stenosis:** While some studies suggest a correlation between senile systemic amyloidosis and calcific aortic stenosis in the elderly, it is not a primary presentation of cardiac amyloidosis itself. **Clinical Pearls for NEET-PG:** * **ECG Hallmark:** Low voltage QRS complexes in the presence of thickened ventricular walls on Echo (Voltage-Thickness mismatch). * **Echocardiography:** Characterized by a **"Sparkling" or "Granular"** appearance of the myocardium. * **Diagnosis:** Cardiac MRI (Late Gadolinium Enhancement) is highly sensitive; **Endomyocardial biopsy** with **Congo Red staining** (showing Apple-green birefringence) remains the gold standard. * **Clinical Sign:** Patients often exhibit extreme sensitivity to Digoxin and Calcium Channel Blockers, which should be avoided.

Question 1140: A 78-year-old woman presents with an acute anterior wall myocardial infarction, accompanied by hypotension and pulmonary congestion. Her blood pressure is 90/70 mm Hg, pulse is 110/min, JVP is at 8 cm, and heart sounds are normal. The lungs exhibit bibasilar crackles, and her extremities are cool and diaphoretic. What would central hemodynamic monitoring most likely reveal in this patient?

A. Decreased right atrial pressure (RAP), low cardiac output (CO), and increased systemic vascular resistance (SVR).
B. Increased right atrial pressure (RAP), decreased cardiac output (CO), and increased systemic vascular resistance (SVR). (Correct Answer)
C. Increased right atrial pressure (RAP), decreased cardiac output (CO), and decreased systemic vascular resistance (SVR).
D. Decreased right atrial pressure (RAP), increased cardiac output (CO), and decreased systemic vascular resistance (SVR).

Explanation: ### Explanation This patient is presenting with **Cardiogenic Shock** secondary to an acute anterior wall myocardial infarction (MI). The clinical triad of hypotension (BP 90/70), pulmonary congestion (bibasilar crackles), and peripheral hypoperfusion (cool, diaphoretic extremities) is diagnostic [1]. **1. Why the Correct Answer is Right:** * **Decreased Cardiac Output (CO):** The primary insult is extensive myocardial necrosis, leading to impaired contractility (systolic dysfunction) [1]. This results in a low stroke volume and low CO. * **Increased Right Atrial Pressure (RAP):** As the left ventricle fails, blood "backs up" into the lungs (causing crackles) and eventually into the right heart, elevating the RAP and Pulmonary Capillary Wedge Pressure (PCWP) [2]. * **Increased Systemic Vascular Resistance (SVR):** In response to low CO, the body activates the sympathetic nervous system and the Renin-Angiotensin-Aldosterone System (RAAS) [1]. This causes compensatory peripheral vasoconstriction to maintain perfusion to vital organs, thereby increasing SVR. **2. Analysis of Incorrect Options:** * **Option A:** Incorrect because RAP is increased due to volume backup, not decreased. Decreased RAP is seen in hypovolemic shock [2]. * **Option C:** Incorrect because SVR is increased as a compensatory mechanism. Decreased SVR is characteristic of Distributive Shock (e.g., Septic or Anaphylactic shock). * **Option D:** This profile (High CO, Low SVR) describes Hyperdynamic/Septic shock, which is the physiological opposite of cardiogenic shock. **3. NEET-PG High-Yield Pearls:** * **Hemodynamic Hallmark of Cardiogenic Shock:** PCWP >18 mmHg and Cardiac Index <2.2 L/min/m². * **JVP vs. RAP:** In clinical vignettes, an elevated JVP is a bedside surrogate for increased RAP. * **Management:** The definitive treatment is emergent revascularization (PCI). Inotropic support (Dobutamine) or mechanical circulatory support (IABP) may be used as bridges. * **Differentiation:** Unlike hypovolemic shock (where the heart is "empty"), in cardiogenic shock, the heart is "full" but cannot pump [1].

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Cardiology — MCQs

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