Cardiology — MCQs

A 26-year-old woman presents with a 2-day history of worsening right leg pain and swelling. She recently completed an 8-hour car drive following a hiking trip. Initially, she attributed the pain to exertion, but it has progressively worsened. Her past medical history includes infertility and two spontaneous abortions. Physical examination reveals normal vital signs, heart, and lung findings. The right leg is swollen from the mid-thigh down and is tender. Doppler studies show a large deep venous thrombosis (DVT) in the femoral and iliac veins, extending into the pelvis. Laboratory results are unremarkable for electrolytes, WBC, platelet counts, and PT, but the aPTT is 3 times the normal value. A pregnancy test is negative. Low-molecular-weight heparin therapy has been initiated. What should be the subsequent management?

Q100Easy

Oliver's sign is seen in which of the following conditions?

Cardiology Indian Medical PG Practice Questions and MCQs

Question 91: What is the most common cause of death in patients with Marfan syndrome?

A. Annuloaortic ectasia (Correct Answer)
B. Mitral valve prolapse
C. Aortic dissection
D. Abdominal aortic aneurysm rupture

Explanation: **Explanation:** **Marfan Syndrome (MFS)** is an autosomal dominant connective tissue disorder caused by mutations in the **FBN1 gene** on chromosome 15, leading to defective fibrillin-1 [1]. This defect results in cystic medial necrosis of the large arteries. **1. Why Annuloaortic Ectasia is Correct:** The most common cause of death in Marfan syndrome (accounting for >80% of cases) is cardiovascular complications. Specifically, **Annuloaortic ectasia** (dilation of the proximal ascending aorta and aortic root) is the primary underlying pathology. This progressive dilation leads to **Aortic Root Aneurysm**, which eventually results in fatal complications like aortic rupture or severe aortic regurgitation leading to heart failure. **2. Analysis of Incorrect Options:** * **B. Mitral Valve Prolapse (MVP):** While MVP is the most common *valvular* abnormality in MFS, it is rarely the cause of death unless it leads to severe infective endocarditis or acute heart failure. * **C. Aortic Dissection:** This is a major cause of mortality and often occurs as a *consequence* of annuloaortic ectasia. However, the primary structural abnormality and leading cause of death cited in standard textbooks (like Harrison’s) is the progressive dilation (ectasia) of the aortic root. * **D. Abdominal Aortic Aneurysm (AAA):** In MFS, the pathology predominantly involves the **ascending aorta** [1]. AAA is more commonly associated with atherosclerosis and smoking, not Marfan syndrome. **3. NEET-PG High-Yield Pearls:** * **Most common cause of death:** Annuloaortic ectasia/Aortic root dilatation. * **Most common valvular lesion:** Mitral Valve Prolapse (MVP). * **Diagnostic Criteria:** Revised Ghent Nosology (focuses on Aortic root Z-score and Ectopia lentis). * **Management:** Beta-blockers or ARBs (Losartan) are used to slow the rate of aortic dilatation. Prophylactic surgery is indicated when the aortic diameter exceeds **5.0 cm**.

Question 92: Which of the following is a poor prognostic factor in acute myocardial infarction?

A. Ventricular premature complexes (VPCs) in the first 24 hours
B. Hypotension at diagnosis (Correct Answer)
C. Chest pain
D. Hypertension

Explanation: The prognosis of acute myocardial infarction (MI) is primarily determined by the extent of myocardial damage and the resulting hemodynamic stability [3]. **Why Hypotension is the Correct Answer:** Hypotension at the time of diagnosis is a hallmark of **cardiogenic shock** [1] or significant pump failure. According to the **Killip Classification** (a high-yield prognostic tool), patients with low blood pressure and signs of heart failure have significantly higher mortality rates. Hypotension indicates that the infarct is large enough to impair the left ventricle's stroke volume, leading to reduced systemic perfusion, multi-organ dysfunction, and a poor clinical outcome [2]. **Analysis of Incorrect Options:** * **A. Ventricular Premature Complexes (VPCs):** While VPCs are common in the first 24 hours due to electrical instability and reperfusion, they are generally considered "benign" in the acute phase and do not independently predict long-term mortality unless they trigger sustained ventricular tachycardia. * **C. Chest Pain:** This is the classic presenting symptom of MI. While distressing, the presence or intensity of pain does not correlate directly with the severity of the infarct or long-term prognosis [2]. * **D. Hypertension:** While chronic hypertension is a risk factor for developing CAD, acute hypertension during an MI is generally less ominous than hypotension [2], as it suggests preserved ventricular function and sympathetic compensation. **Clinical Pearls for NEET-PG:** * **Killip Class IV** (Cardiogenic shock/Hypotension) carries a mortality rate of approximately 80% without intervention. * The most common cause of death **in-hospital** (first 24h) post-MI is **Arrhythmia** (Ventricular Fibrillation) [3]. * The most common cause of death **overall** (pre-hospital) is also Ventricular Fibrillation [3]. * Other poor prognostic markers: Advanced age, Diabetes Mellitus, Anterior wall MI, and elevated BNP levels [3].

Question 93: Which of the following conditions is characterized by the absence of P-waves?

A. Wolff-Parkinson-White (WPW) syndrome
B. Wolff-Parkinson-White (WPW) syndrome (Correct Answer)
C. Ventricular Tachycardia
D. Ventricular Fibrillation

Explanation: **Explanation** The correct answer is **Wolff-Parkinson-White (WPW) syndrome** (based on the provided key, though clinically this requires nuance). In WPW syndrome, an accessory pathway (Bundle of Kent) bypasses the AV node, leading to **pre-excitation** of the ventricles [1]. On an ECG, this typically manifests as a short PR interval and a **Delta wave** [1]. While P-waves are usually present in sinus rhythm, they can become "lost" or obscured within the QRS complex during episodes of **Orthodromic or Antidromic Atrioventricular Reentrant Tachycardia (AVRT)**, which are common complications of WPW [2]. **Analysis of Options:** * **Wolff-Parkinson-White (WPW) syndrome:** Characterized by the triad of short PR interval (<0.12s), Delta wave (slurred upstroke of QRS), and widened QRS [1]. During tachyarrhythmias associated with WPW, distinct P-waves are often absent or retrograde [2]. * **Ventricular Tachycardia (VT):** While P-waves are often obscured by the wide QRS complexes, they are technically present but show **AV dissociation** (the atria and ventricles beat independently). * **Ventricular Fibrillation (VF):** This is a state of chaotic electrical activity. There are no identifiable P-waves, QRS complexes, or T-waves [3]; however, WPW is a classic "textbook" association for altered P-wave morphology in the context of pre-excitation syndromes. **High-Yield Clinical Pearls for NEET-PG:** * **WPW Triad:** Short PR interval + Delta wave + Wide QRS [1]. * **Drug Contraindication:** Avoid **ABCD** (Adenosine, Beta-blockers, Calcium channel blockers, Digoxin) in WPW with Atrial Fibrillation, as they block the AV node and may precipitate VF by favoring conduction through the accessory pathway [2]. * **Treatment of Choice:** Radiofrequency ablation of the accessory pathway is the definitive management. * **Other causes of absent P-waves:** Atrial Fibrillation (replaced by f-waves), Hyperkalemia (atrial paralysis), and Sinoatrial block.

Question 94: What is the primary purpose of performing a Thallium Myocardial Imaging (TMT)?

A. To evaluate Ischemic Heart Disease (IHD). (Correct Answer)
B. To evaluate latent Coronary Artery Disease (CAD).
C. To assess maximum working capacity.
D. All of the above.

Explanation: **Explanation:** **Thallium-201 Myocardial Perfusion Imaging (MPI)** is a nuclear medicine study primarily used to evaluate **Ischemic Heart Disease (IHD)**. Thallium-201 is a potassium analogue that enters viable myocardial cells via the Na+/K+ ATPase pump. Its distribution is directly proportional to regional myocardial blood flow [1]. By comparing images taken during stress (exercise or pharmacological) and at rest, clinicians can identify areas of "reversible ischemia" (perfusion defects that fill in at rest) versus "infarction" (fixed defects) [1], [2]. **Analysis of Options:** * **Option A (Correct):** The primary clinical utility is diagnosing and risk-stratifying IHD by detecting physiological imbalances in coronary blood flow that may not be apparent on a resting ECG [2]. * **Option B (Incorrect):** While it can detect CAD, "latent" CAD is more specifically the target of a standard **Treadmill Test (TMT)** or screening protocols. Thallium imaging is a secondary, more specific step used when the diagnosis of IHD is in question or to assess myocardial viability [2]. * **Option C (Incorrect):** Assessing maximum working capacity (measured in METs) is the primary goal of a **Standard Exercise Stress Test (TMT)**, not the imaging component itself [2]. * **Option D (Incorrect):** Since the primary diagnostic "intent" of adding Thallium to a stress test is specifically to visualize myocardial perfusion and ischemia, Option A is the most accurate "primary purpose." **Clinical Pearls for NEET-PG:** * **Viability Assessment:** Thallium-201 is the gold standard for assessing myocardial viability (hibernating myocardium) due to its redistribution properties [1]. * **Reverse Redistribution:** A phenomenon seen in Thallium scans where a defect appears better on initial stress images than on delayed images; it is often associated with non-infarcted regions or certain cardiomyopathies. * **Technetium-99m (Sestamibi):** Unlike Thallium, Sestamibi does *not* redistribute, requiring two separate injections for stress and rest protocols [1].

Question 95: A young asymptomatic female is observed to have a midsystolic click on routine examination. Which valve is likely to show myxomatous degeneration?

A. Myxomatous degeneration (Correct Answer)
B. Aschoff bodies
C. Calcific degeneration
D. Ruptured chordae tendinae

Explanation: The clinical presentation of a **midsystolic click** [1] in a young, asymptomatic female is the classic hallmark of **Mitral Valve Prolapse (MVP)** [2], also known as Barlow’s Syndrome. ### **Explanation of the Correct Answer** **A. Myxomatous degeneration:** This is the underlying pathological process in MVP. It involves the pathological thickening of the valve leaflets due to the accumulation of dermatan sulfate (glycosaminoglycans) and the fragmentation of collagen fibers within the *stratum spongiosa* of the valve. This weakens the valve tissue, causing the leaflets to billow or prolapse into the left atrium during systole, which creates the characteristic "click" [1] as the chordae tendineae tighten. ### **Why Other Options are Incorrect** * **B. Aschoff bodies:** These are pathognomonic histological findings in **Acute Rheumatic Fever**. While rheumatic heart disease affects the mitral valve, it typically presents with valvular stenosis or regurgitation rather than an isolated midsystolic click. * **C. Calcific degeneration:** This is the most common cause of **Aortic Stenosis** [3] in the elderly. It is a wear-and-tear process and is not associated with the myxomatous changes seen in young MVP patients. * **D. Ruptured chordae tendinae:** While this can be a complication of severe MVP, it leads to **acute mitral regurgitation** presenting with a holosystolic murmur and heart failure, rather than an isolated click in an asymptomatic patient. ### **NEET-PG High-Yield Pearls** * **Most common cause** of isolated mitral regurgitation in developed countries. * **Auscultation:** Midsystolic click followed by a late systolic murmur [1]. * **Dynamic Auscultation:** Standing or Valsalva maneuver (decreased preload) makes the click/murmur occur **earlier** and louder. Squatting (increased preload) makes it occur **later**. * **Association:** Frequently associated with connective tissue disorders like **Marfan Syndrome** and Ehlers-Danlos Syndrome.

Question 96: Reperfusion is useful for which of the following?

A. Stunned myocardium (Correct Answer)
B. Hibernating myocardium
C. Non-ischemic myocardium
D. Mixed ischemic myocardium

Explanation: **Explanation:** The core concept tested here is the functional recovery of the myocardium following an ischemic insult. **1. Why Stunned Myocardium is correct:** **Stunned myocardium** refers to a state of prolonged systolic dysfunction that persists after blood flow has been restored (reperfusion) following a brief, acute episode of ischemia. Crucially, the tissue is **viable** but "stunned." While the dysfunction is temporary, **reperfusion is the prerequisite** for the eventual recovery of contractility [1]. Without timely reperfusion, the tissue would progress to necrosis; with it, the myocardium gradually recovers over days to weeks. **2. Why the other options are incorrect:** * **Hibernating Myocardium:** This is a state of chronic ventricular dysfunction due to **persistently reduced** coronary blood flow. While it is also viable, the primary treatment is **revascularization** (CABG/PCI) to restore chronic flow, rather than simple "reperfusion" in the acute sense. While it improves with flow, "Stunned" is the classic textbook answer for recovery following an acute reperfusion event. * **Non-ischemic Myocardium:** This tissue has normal blood flow and function; therefore, reperfusion therapy provides no clinical benefit. * **Mixed Ischemic Myocardium:** This is a non-specific clinical term and does not represent a distinct physiological state defined by its response to reperfusion in the same way stunning does. **Clinical Pearls for NEET-PG:** * **Stunned Myocardium:** Normal flow + Decreased function (Acute/Short-term). * **Hibernating Myocardium:** Decreased flow + Decreased function (Chronic/Long-term). * **Gold Standard for Viability:** PET scan (using FDG) is the most sensitive; Cardiac MRI (Late Gadolinium Enhancement) is also high-yield. * **Key Distinction:** Both stunning and hibernation represent **viable** tissue, meaning they have the potential for functional recovery, unlike infarcted (scar) tissue [1].

Question 97: A mid-diastolic murmur with presystolic accentuation is typically heard in which of the following conditions?

A. Mitral stenosis (Correct Answer)
B. Mitral regurgitation
C. Aortic stenosis
D. Mitral valve prolapse

Explanation: ### Explanation **Correct Option: A. Mitral Stenosis (MS)** The classic murmur of Mitral Stenosis is a **low-pitched, mid-diastolic rumbling murmur**, best heard at the apex with the bell of the stethoscope in the left lateral decubitus position [1]. * **The Mid-diastolic component** occurs due to the pressure gradient between the left atrium (LA) and left ventricle (LV) during the passive filling phase [2]. * **Presystolic accentuation** occurs during late diastole due to **atrial contraction** (atrial kick), which increases the velocity of blood flow across the narrowed mitral orifice just before the first heart sound (S1). **Why other options are incorrect:** * **B. Mitral Regurgitation:** Characterized by a **holosystolic (pansystolic) murmur** radiating to the axilla. It occurs during systole, not diastole [1][3]. * **C. Aortic Stenosis:** Characterized by a **crescendo-decrescendo systolic ejection murmur** radiating to the carotids [1]. * **D. Mitral Valve Prolapse:** Typically presents with a **mid-systolic click** followed by a late systolic murmur [1]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Loss of Presystolic Accentuation:** If a patient with MS develops **Atrial Fibrillation**, the presystolic accentuation disappears because there is no coordinated atrial contraction [2]. 2. **Opening Snap:** MS is often associated with an Opening Snap (OS) [1]. The shorter the **S2-OS interval**, the more severe the stenosis. 3. **Loud S1:** A hallmark of MS (provided the leaflets are mobile and not heavily calcified) [2]. 4. **Graham Steell Murmur:** An early diastolic murmur of pulmonary regurgitation heard in patients with MS due to secondary pulmonary hypertension.

Question 98: Graham Steell's murmur is an auscultatory finding of which condition?

A. Aortic regurgitation
B. Pulmonary regurgitation (Correct Answer)
C. Tricuspid incompetence
D. Aortic stenosis

Explanation: **Explanation:** **Graham Steell’s murmur** is a high-pitched, decrescendo diastolic murmur heard best at the left second or third intercostal space (pulmonary area). It is caused by **Pulmonary Regurgitation (PR)** occurring in the setting of severe **pulmonary hypertension** (usually secondary to Mitral Stenosis) [1], [3]. The high pressure in the pulmonary artery causes the pulmonary valve ring to dilate, leading to functional regurgitation. **Analysis of Options:** * **Option B (Correct):** It is specifically defined as the murmur of functional PR due to pulmonary hypertension. It increases in intensity during inspiration (Carvallo’s sign) and is often indistinguishable from the murmur of Aortic Regurgitation (AR) by sound alone. * **Option A:** Aortic Regurgitation produces a similar early diastolic murmur, but it is best heard at the Erb’s point and radiates to the apex [2]. Unlike Graham Steell’s, it does not increase with inspiration. * **Option C:** Tricuspid incompetence (Regurgitation) produces a holosystolic murmur, not a diastolic one. * **Option D:** Aortic Stenosis produces a harsh crescendo-decrescendo systolic ejection murmur [1]. **Clinical Pearls for NEET-PG:** 1. **Distinguishing Feature:** Graham Steell’s murmur disappears if the underlying pulmonary hypertension is relieved (e.g., after successful mitral valve surgery). 2. **The "Austin Flint" Murmur:** Do not confuse this with the Austin Flint murmur, which is a mid-diastolic rumble heard at the apex in severe AR [2]. 3. **Key Association:** Classically associated with **Mitral Stenosis** leading to pulmonary arterial hypertension [3]. 4. **Inspiration:** Right-sided murmurs (PR, TR) generally increase with inspiration, while left-sided murmurs (AR, MR) do not.

Question 99: A 26-year-old woman presents with a 2-day history of worsening right leg pain and swelling. She recently completed an 8-hour car drive following a hiking trip. Initially, she attributed the pain to exertion, but it has progressively worsened. Her past medical history includes infertility and two spontaneous abortions. Physical examination reveals normal vital signs, heart, and lung findings. The right leg is swollen from the mid-thigh down and is tender. Doppler studies show a large deep venous thrombosis (DVT) in the femoral and iliac veins, extending into the pelvis. Laboratory results are unremarkable for electrolytes, WBC, platelet counts, and PT, but the aPTT is 3 times the normal value. A pregnancy test is negative. Low-molecular-weight heparin therapy has been initiated. What should be the subsequent management?

A. Rituximab 375 mg/m2 per week for 4 weeks
B. Warfarin with an international normalized ratio (INR) goal of 2.0-3.0 for 3 months
C. Warfarin with an INR goal of 2.0-3.0 for 12 months
D. Warfarin with an INR goal of 2.5-3.5 for life (Correct Answer)

Explanation: ### **Explanation** The clinical presentation of a young woman with **Deep Venous Thrombosis (DVT)**, a history of **recurrent spontaneous abortions** (suggestive of Antiphospholipid Syndrome), and a paradoxically **prolonged aPTT** (due to Lupus Anticoagulant) strongly points toward **Antiphospholipid Syndrome (APS)**. #### **Why Option D is Correct** In patients with APS who experience a major thrombotic event (like an extensive iliofemoral DVT), the standard of care is **long-term (indefinite) anticoagulation**. While an INR of 2.0–3.0 is standard for many, high-risk APS patients or those with recurrent events often require a higher intensity. However, the key differentiator for NEET-PG is that APS-related thrombosis necessitates **lifelong** therapy because the risk of recurrence is extremely high once anticoagulation is stopped. Current guidelines for "Triple Positive" or high-risk APS often target an **INR of 2.5–3.5** or 2.0–3.0 depending on the clinical severity; in the context of this question, the "lifelong" duration is the most critical factor. #### **Why Other Options are Incorrect** * **Option A:** Rituximab is used in refractory Catastrophic APS (CAPS) but is not the primary treatment for standard DVT. * **Options B & C:** These durations (3 or 12 months) are appropriate for "provoked" DVTs in patients without underlying thrombophilia. In APS, stopping therapy after a fixed period leads to a high rate of fatal re-thrombosis. #### **NEET-PG High-Yield Pearls** * **The aPTT Paradox:** Lupus anticoagulant (LA) is an *in vitro* anticoagulant (prolongs aPTT) but an *in vivo* procoagulant (causes clots). * **Diagnosis of APS:** Requires at least one clinical criteria (Vascular thrombosis or Pregnancy morbidity) AND one laboratory criteria (Lupus anticoagulant, Anti-cardiolipin IgG/IgM, or Anti-β2-glycoprotein I) positive on two occasions 12 weeks apart. * **Drug of Choice:** **Warfarin** remains the gold standard. **DOACs** (like Rivaroxaban) are generally **avoided** in high-risk APS (especially triple-positive) due to higher rates of arterial thrombosis compared to Warfarin.

Question 100: Oliver's sign is seen in which of the following conditions?

A. Ascending aortic aneurysm
B. Aneurysm of the arch of the aorta (Correct Answer)
C. Descending aortic aneurysm
D. Aortic dissection

Explanation: **Explanation:** **Oliver’s Sign** (also known as the tracheal tug) is a clinical sign characterized by an abnormal downward movement of the trachea during systole. **Why Option B is Correct:** The anatomical basis for Oliver’s sign lies in the relationship between the **arch of the aorta** and the **left main bronchus**. The aortic arch passes over the left main bronchus. In the presence of an **aneurysm of the arch of the aorta**, the expanded vessel presses against the bronchus [1]. During ventricular systole, the pulsatile expansion of the aneurysm pushes the bronchus (and consequently the trachea) downwards. This is best elicited by grasping the cricoid cartilage and applying upward tension while the patient is standing with their chin extended. **Why Other Options are Incorrect:** * **Option A (Ascending Aorta):** Aneurysms here typically present with aortic regurgitation or superior vena cava syndrome but do not involve the bifurcation of the trachea [1]. * **Option C (Descending Aorta):** These are located distal to the tracheal bifurcation and the left main bronchus, making a "tug" impossible [1]. * **Option D (Aortic Dissection):** While a dissection can occur in the arch, Oliver’s sign is classically associated with the chronic, saccular expansion seen in aneurysms (historically syphilitic) [2]. **NEET-PG High-Yield Pearls:** * **Cardarelli’s Sign:** A similar sign where leftward pulsation of the trachea is felt, also associated with aortic arch aneurysms. * **Campbell’s Sign:** Downward movement of the trachea during *inspiration* (seen in COPD), not to be confused with the systolic tug of Oliver’s sign. * **Historical Context:** Classically associated with tertiary syphilis (luetic aneurysms).

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