Cardiology — MCQs

Cardiology Indian Medical PG Practice Questions and MCQs

Question 561: Which of the following is an absolute contraindication for exercise testing?

A. Unstable angina
B. Aortic stenosis (Correct Answer)
C. Peripheral vascular disease
D. One week following myocardial infarction

Explanation: **Explanation:** Exercise stress testing is a vital diagnostic tool, but identifying contraindications is critical for patient safety. The correct answer is **Symptomatic Severe Aortic Stenosis (AS)**, which is considered an **absolute contraindication**. **1. Why Aortic Stenosis is the Correct Answer:** In severe AS, the fixed outflow obstruction prevents the heart from increasing cardiac output in response to exercise-induced vasodilation [2]. This leads to a critical drop in systemic blood pressure, potentially causing exercise-induced syncope, myocardial ischemia, or fatal arrhythmias. Note: While the option simply says "Aortic Stenosis," in clinical practice and exams, it refers to *symptomatic* or *severe* AS [1]. **2. Analysis of Incorrect Options:** * **A. Unstable Angina:** While high-risk unstable angina is an absolute contraindication, "unstable angina" in general is often categorized as a relative contraindication if the patient has been stabilized [4]. However, compared to the mechanical obstruction of AS, AS is the more classic "textbook" absolute contraindication in this MCQ format. * **C. Peripheral Vascular Disease (PVD):** This is a **relative contraindication**. PVD may limit the patient's ability to reach the target heart rate due to claudication, but it does not pose an immediate life-threatening risk during the test itself [3]. Pharmacological stress testing is preferred here. * **D. One week following MI:** An MI within **2 days (48 hours)** is an absolute contraindication. By one week, stable patients are often candidates for submaximal stress testing (the "Naughton protocol") prior to hospital discharge. **3. NEET-PG High-Yield Pearls:** * **Absolute Contraindications:** Acute MI (<2 days), Unstable arrhythmia, Symptomatic severe AS, Decompensated Heart Failure, Acute Pulmonary Embolism, and Acute Aortic Dissection. * **Stopping Criteria:** Stop the test immediately if there is a drop in Systolic BP >10 mmHg, CNS symptoms (ataxia/dizziness), or signs of poor perfusion (cyanosis/pallor). * **Target Heart Rate:** The test is usually terminated when the patient reaches 85% of their age-predicted maximum heart rate (220 - age).

Question 562: Rheumatic fever is commonly associated with affection of which valve?

A. Tricuspid valve
B. Mitral valve (Correct Answer)
C. Aortic valve
D. Pulmonary valve

Explanation: Rheumatic Heart Disease (RHD) is a sequela of Acute Rheumatic Fever (ARF) caused by an autoimmune response following a Group A Streptococcal pharyngeal infection. The correct answer is the **Mitral Valve**, as it is the most frequently involved valve in both acute and chronic rheumatic carditis [1]. **1. Why Mitral Valve is Correct:** The mitral valve is affected in nearly **95-100%** of cases of RHD. The high hemodynamic stress and pressure gradients on the left side of the heart are believed to make the mitral and aortic valves more susceptible to the inflammatory process and subsequent scarring (commissural fusion). In the acute phase, it typically presents as mitral regurgitation [1]; in the chronic phase, it is the leading cause of mitral stenosis. **2. Analysis of Incorrect Options:** * **Aortic Valve (Option C):** This is the second most common valve involved (approx. 20-30%). It is rarely affected in isolation and is usually seen in combination with mitral valve disease. * **Tricuspid Valve (Option A):** Involvement is uncommon (approx. 5%) and almost always occurs secondary to significant mitral and aortic disease [1]. * **Pulmonary Valve (Option D):** This is the least commonly affected valve in RHD. Isolated rheumatic pulmonary valve disease is extremely rare. **High-Yield Clinical Pearls for NEET-PG:** * **Order of frequency of valve involvement:** Mitral > Aortic > Tricuspid > Pulmonary (M > A > T > P). * **Most common lesion in RHD:** Mitral Regurgitation (Acute/Early); Mitral Stenosis (Chronic) [1]. * **Pathognomonic Histology:** **Aschoff bodies** (found in the myocardium) and **Anitschkow cells** (caterpillar cells). * **McCallum’s Patch:** An area of endocardial thickening in the posterior wall of the left atrium, usually due to the jet effect of mitral regurgitation.

Question 563: All of the following are major criteria in the diagnosis of Acute Rheumatic Fever, except?

A. Migratory Polyarthralgia (Correct Answer)
B. Subcutaneous Nodules
C. Chorea
D. Carditis

Explanation: The diagnosis of Acute Rheumatic Fever (ARF) is based on the **Revised Jones Criteria (2015)**. This system categorizes clinical and laboratory findings into Major and Minor criteria based on the patient's risk population (Low vs. Moderate/High risk) [1]. ### Why "Migratory Polyarthralgia" is the Correct Answer In the Jones Criteria, **Migratory Polyarthritis** (objective evidence of joint swelling, heat, and redness in multiple joints) is a **Major** criterion. In contrast, **Polyarthralgia** (joint pain without objective findings) is classified only as a **Minor** criterion. This distinction is a frequent "trap" in NEET-PG questions. ### Analysis of Other Options (Major Criteria) * **Carditis (Option D):** A major criterion that can be clinical (murmurs) or subclinical (detected by Echocardiography/Doppler) [1]. It is the only manifestation of ARF that leads to chronic disability. It may manifest as breathlessness due to heart failure or new murmurs [1]. * **Chorea (Option C):** Also known as Sydenham’s chorea or "St. Vitus' Dance." It is a major criterion characterized by involuntary, purposeless movements and emotional lability. * **Subcutaneous Nodules (Option B):** Small, painless, firm lumps usually found over bony prominences or tendons. They are a major criterion, though less common. ### High-Yield Clinical Pearls for NEET-PG * **Mnemonic for Major Criteria (JONES):** **J**oints (Polyarthritis), **O** (Heart - Carditis), **N**odules, **E**rythema Marginatum, **S**ydenham Chorea. * **Minor Criteria:** Arthralgia, Fever, Elevated ESR/CRP, and Prolonged PR interval on ECG. * **Essential Requirement:** Evidence of a preceding Group A Streptococcal (GAS) infection (e.g., elevated ASO titer or positive throat culture) is mandatory for diagnosis, except in cases of isolated Chorea or Insidious Carditis [1]. * **Joint Involvement:** The arthritis in ARF is typically "migratory" and shows a dramatic response to Salicylates (Aspirin).

Question 564: All of the following are true regarding hypertrophic cardiomyopathy EXCEPT:

A. Digoxin is helpful (Correct Answer)
B. Irregular thickness of septa
C. Dynamic obstruction
D. Double apical impulse

Explanation: **Explanation:** **Hypertrophic Cardiomyopathy (HCM)** is characterized by asymmetrical septal hypertrophy and dynamic left ventricular outflow tract (LVOT) obstruction. **Why Option A is the Correct Answer (The "Except"):** Digoxin is a positive inotrope. In HCM, increasing the force of myocardial contraction worsens the LVOT obstruction by narrowing the outflow tract further during systole. Additionally, by increasing contractility, it can exacerbate the **Systolic Anterior Motion (SAM)** of the mitral valve. Therefore, Digoxin is generally **contraindicated** in HCM (unless there is associated atrial fibrillation with a rapid ventricular rate that cannot be controlled by other means). **Analysis of Other Options:** * **B. Irregular thickness of septa:** This is a hallmark of HCM. The hypertrophy is typically asymmetrical, with the interventricular septum being significantly thicker than the posterior wall (Septal:Posterior wall ratio > 1.3:1) [1]. * **C. Dynamic obstruction:** Unlike fixed aortic stenosis, the obstruction in HCM is "dynamic." It varies with ventricular volume and contractility. Maneuvers that decrease preload (e.g., Valsalva, standing) increase the obstruction and the intensity of the murmur. * **D. Double apical impulse:** A forceful atrial contraction against a stiff ventricle produces a palpable S4, which, combined with the displaced apex beat, creates a "double" or "bifid" apical impulse [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Beta-blockers (first-line) or Verapamil (non-dihydropyridine CCBs) to improve diastolic filling. * **Murmur:** Harsh systolic ejection murmur at the left sternal border; **increases** with Valsalva/Standing and **decreases** with Squatting/Handgrip [1]. * **Genetics:** Most commonly due to mutations in genes encoding **Beta-myosin heavy chain** or **Myosin-binding protein C** [1]. * **Sudden Cardiac Death (SCD):** HCM is the most common cause of SCD in young athletes [1].

Question 565: What is the secondary prophylaxis for a patient with a history of myocardial infarction who was previously treated with antiplatelet and thrombolytic therapy?

A. Beta-blockers (Correct Answer)
B. Calcium channel blockers
C. Nitrates
D. Aldosterone antagonists

Explanation: 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.

Question 566: Severity of Aortic stenosis is determined by?

A. Late ejection systolic murmur
B. ST-T changes
C. Left ventricular hypertrophy with displaced apex
D. All the above (Correct Answer)

Explanation: The severity of Aortic Stenosis (AS) is assessed through a combination of clinical symptoms, physical examination findings, and electrocardiographic/echocardiographic data. [1] **Explanation of the Correct Answer:** The correct answer is **D (All the above)** because each option represents a marker of advanced valvular obstruction and the resulting pressure overload on the left ventricle (LV). * **Late Ejection Systolic Murmur:** In mild AS, the murmur peaks early. As the orifice narrows, it takes longer for the LV to eject blood across the stenotic valve, causing the murmur to peak later in systole. [1], [3] A **late-peaking murmur** is a classic bedside sign of severe AS. [1] * **ST-T Changes:** Chronic pressure overload leads to significant LV strain. On an ECG, this manifests as ST-segment depression and T-wave inversion (LV strain pattern) in the lateral leads (V5, V6, I, aVL). The presence of these changes correlates with increased LV mass and disease severity. * **LVH with Displaced Apex:** To overcome the high afterload, the LV undergoes concentric hypertrophy. Eventually, this leads to ventricular remodeling and dilatation. A **sustained, heaving, and laterally displaced apex beat** indicates significant LV hypertrophy and potential heart failure, marking advanced disease. [2] **High-Yield Clinical Pearls for NEET-PG:** 1. **Pulsus Parvus et Tardus:** A small-volume and slow-rising carotid pulse is the most reliable physical sign of severe AS. [1] 2. **S2 Heart Sound:** In severe AS, the aortic component (A2) is delayed or absent, leading to a **reversed (paradoxical) splitting of S2** or a single S2. [1], [3] 3. **Gallavardin Phenomenon:** The dissociation between the noisy systolic murmur at the base and musical high-frequency components at the apex (mimicking mitral regurgitation). [1] 4. **Symptom Triad (SAD):** Syncope, Angina, and Dyspnea indicate a poor prognosis and the need for urgent valve replacement.

Question 567: Infective endocarditis is least likely to occur in which of the following conditions?

A. Ventricular Septal Defect (VSD)
B. Atrial Septal Defect (ASD) (Correct Answer)
C. Tetralogy of Fallot
D. Coarctation of the Aorta

Explanation: The risk of **Infective Endocarditis (IE)** is primarily determined by the presence of high-velocity turbulent blood flow, which causes endothelial damage. This damage leads to the deposition of fibrin and platelets (Non-Bacterial Thrombotic Endocarditis), providing a nidus for bacterial colonization during bacteremia. **Why Atrial Septal Defect (ASD) is the correct answer:** In a secundum ASD, the pressure gradient between the left and right atrium is very low [3]. This results in **low-velocity, non-turbulent flow** across the defect. Consequently, there is minimal endocardial trauma, making IE extremely rare in isolated ASDs [1]. (Note: Primum ASDs or those associated with mitral valve abnormalities carry a higher risk). **Why the other options are incorrect:** * **Ventricular Septal Defect (VSD):** Small to medium VSDs create high-velocity jets from the high-pressure left ventricle to the low-pressure right ventricle, causing significant turbulence and a high risk of IE [2]. * **Tetralogy of Fallot (TOF):** This is a high-risk condition due to multiple factors, including VSD turbulence and right ventricular outflow tract obstruction. * **Coarctation of the Aorta:** The narrowing creates high-velocity flow and turbulence, often associated with a bicuspid aortic valve, both of which are significant risk factors for IE [3]. **NEET-PG High-Yield Pearls:** * **Highest Risk Conditions:** Prosthetic heart valves, previous IE, and cyanotic congenital heart disease (unrepaired) [1]. * **Negligible Risk (Prophylaxis not required):** Isolated secundum ASD, repaired VSD/ASD (after 6 months), and physiological heart murmurs [1]. * **Commonest Site for IE in VSD:** The right ventricular side of the defect (where the jet strikes). * **Commonest Organism:** *Staphylococcus aureus* (Acute/IV drug users) and *Viridans streptococci* (Subacute/Post-dental procedures). * **Diagnosis:** The modified Duke criteria, including major criteria like positive blood cultures and echocardiographic evidence of vegetations, are used for diagnosis [4].

Question 568: In hypertension, on what factor does end-organ involvement primarily depend?

A. Diastolic blood pressure (Correct Answer)
B. Systolic blood pressure
C. Mean capillary blood pressure
D. Decreased elasticity of blood vessels

Explanation: **Explanation:** The primary determinant of end-organ damage in hypertension is the **Diastolic Blood Pressure (DBP)**. This is because DBP represents the "resting" pressure within the arterial system while the heart is in the relaxation phase. A chronically elevated DBP indicates that the peripheral resistance is high and the microvasculature is under constant, unrelenting stress [1]. This persistent pressure leads to hyaline arteriolosclerosis and fibrinoid necrosis, particularly in the kidneys (nephrosclerosis), brain (lacunar infarcts), and retina [1]. **Analysis of Options:** * **A. Diastolic Blood Pressure (Correct):** It reflects the minimum pressure the organs are exposed to at all times. Clinical studies have historically shown that DBP is a more reliable predictor of hypertensive complications in patients under the age of 50. * **B. Systolic Blood Pressure:** While SBP is a major risk factor for cardiovascular events (especially in the elderly), end-organ damage—specifically vascular remodeling and target organ failure—is more traditionally linked to the sustained baseline pressure of DBP. * **C. Mean Capillary Blood Pressure:** This refers to the pressure at the level of exchange vessels [2]. While it influences fluid balance (Starling forces), it is not the primary driver of systemic hypertensive end-organ pathology. * **D. Decreased Elasticity:** This is a *consequence* or a contributing factor to isolated systolic hypertension (stiffening of the aorta) [3], rather than the primary factor upon which end-organ involvement depends. **High-Yield Clinical Pearls for NEET-PG:** * **Malignant Hypertension:** Defined by a DBP typically >120 mmHg associated with papilledema and acute end-organ damage. * **Isolated Systolic Hypertension (ISH):** Common in the elderly due to decreased aortic compliance; it is a significant risk factor for stroke [1]. * **Hypertensive Urgency vs. Emergency:** The distinction depends on the presence of **acute end-organ damage**, not just the absolute BP value.

Question 569: All of the following are true regarding hypertrophic obstructive cardiomyopathy, EXCEPT:

A. Digitalis is useful (Correct Answer)
B. Left ventricular outflow obstruction
C. Asymmetrical septal thickness
D. Double apical impulse

Explanation: **Explanation:** Hypertrophic Obstructive Cardiomyopathy (HOCM) is characterized by a dynamic pressure gradient in the subaortic area, primarily due to asymmetrical septal hypertrophy and systolic anterior motion (SAM) of the mitral valve. **Why Option A is the Correct Answer (The Exception):** **Digitalis (Digoxin)** is generally **contraindicated** in HOCM. As a positive inotrope, Digitalis increases myocardial contractility. In HOCM, increased contractility worsens the left ventricular outflow tract (LVOT) obstruction by narrowing the outflow path further during systole. Similarly, diuretics and vasodilators (which reduce preload/afterload) should be avoided as they exacerbate the gradient. **Analysis of Incorrect Options:** * **Option B (LVOT obstruction):** This is the hallmark of HOCM. The hypertrophy of the interventricular septum creates a physical barrier, leading to a dynamic pressure gradient. * **Option C (Asymmetrical septal thickness):** The classic morphological pattern in HOCM is disproportionate septal hypertrophy (ASH), where the septum is significantly thicker than the posterior wall (Septum:PW ratio > 1.3:1). * **Option D (Double apical impulse):** A "double" or "triple" apical impulse is a classic physical sign. The first component is a forceful atrial contraction (S4) against a stiff ventricle, followed by the actual ventricular apex beat. **NEET-PG High-Yield Pearls:** 1. **Drug of Choice:** Beta-blockers (first-line) or Verapamil (non-dihydropyridine CCBs) to improve diastolic filling. 2. **Murmur Dynamics:** The systolic murmur of HOCM **increases** with Valsalva and standing (decreased preload) and **decreases** with squatting or handgrip (increased preload/afterload). 3. **Genetic Basis:** Most commonly due to mutations in genes encoding sarcomeric proteins (e.g., Beta-myosin heavy chain, Myosin-binding protein C) [1].

Question 570: Which of the following is the investigation of choice for reversible myocardial ischemia?

A. MUGA scan
B. Resting echocardiogram
C. Thallium scan (Correct Answer)
D. Coronary angiography

Explanation: ### Explanation The investigation of choice for **reversible myocardial ischemia** is a **Thallium scan** (Myocardial Perfusion Imaging). [1] **1. Why Thallium Scan is Correct:** Thallium-201 is a potassium analogue that enters viable myocardial cells via the Na+/K+ ATPase pump. In a stress-redistribution protocol, areas of ischemia appear as "cold spots" during exercise (due to decreased blood flow) but "fill in" during rest (redistribution) [1]. This ability to demonstrate **reversible perfusion defects** distinguishes viable but ischemic myocardium from infarcted (scarred) tissue, which remains a "cold spot" even at rest. [1] **2. Why Other Options are Incorrect:** * **MUGA Scan:** This is the gold standard for accurately measuring the **Left Ventricular Ejection Fraction (LVEF)**. It does not assess perfusion or ischemia. * **Resting Echocardiogram:** While it can show regional wall motion abnormalities (RWMA), a resting echo cannot differentiate between an old infarct and active ischemia. It is often normal in patients with stable angina at rest. * **Coronary Angiography (CAG):** This is the gold standard for visualizing **coronary anatomy** and the degree of luminal stenosis [2]. However, it is an anatomical study, not a functional one; it cannot definitively prove if a specific stenosis is causing reversible ischemia at the cellular level. [2] **Clinical Pearls for NEET-PG:** * **Gold Standard for Viability:** PET scan (using FDG) is the most sensitive, but Thallium-201 is the standard clinical choice for "reversible ischemia." * **Hibernating Myocardium:** Chronic but reversible ischemia where wall motion is impaired; it improves after revascularization. * **Stunned Myocardium:** Temporary dysfunction persisting after reperfusion (e.g., post-PCI), despite restored blood flow.

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Cardiology — MCQs

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