Cardiology — MCQs

A 56-year-old male presents with the sudden onset of excruciating pain. He describes the pain as beginning in the anterior chest, radiating to the back, and then moving downward into the abdomen. His blood pressure is found to be 160/115. ECG shows no changes. An abdominal x-ray reveals a "double-barrel" aorta. This abnormality most likely results from?

Q989Easy

What is true about pseudohypertension?

Q990Medium

All right-sided events tend to increase with inspiration, except:

Cardiology Indian Medical PG Practice Questions and MCQs

Question 981: Buerger disease triad involves all of the following except?

A. Raynaud’s Phenomenon
B. Thrombophlebitis of migratory superficial vein
C. Intermittent Claudication
D. None of the above (Correct Answer)

Explanation: **Explanation:** **Thromboangiitis Obliterans (Buerger’s Disease)** is a non-atherosclerotic, segmental, inflammatory disease that most commonly affects small and medium-sized arteries and veins in the extremities. It is strongly associated with heavy tobacco use. The **classic clinical triad** of Buerger’s disease consists of: 1. **Intermittent Claudication:** Usually involving the arch of the foot or the calf, which may progress to rest pain and ischemic ulcerations. 2. **Raynaud’s Phenomenon:** Digital ischemia triggered by cold or emotion (present in about 40% of cases). 3. **Migratory Superficial Thrombophlebitis:** Inflammation of the superficial veins that appears to "move" from one site to another. Since all three options (A, B, and C) are integral components of the diagnostic triad, the correct answer is **D (None of the above)**. **Analysis of Options:** * **Option A:** Raynaud's phenomenon is a frequent early sign of Buerger’s, reflecting small vessel vasospasm. * **Option B:** Migratory superficial thrombophlebitis is a hallmark feature that distinguishes Buerger’s from other forms of peripheral arterial disease (PAD). * **Option C:** Claudication is the most common presenting symptom, often involving the small vessels of the hands and feet (distal distribution). **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Typically affects young males (<45 years) who are heavy smokers. * **Angiographic Finding:** "Corkscrew collaterals" (Martorell’s sign) due to the occlusion of distal vessels. * **Pathology:** Characterized by a highly cellular, "inflammatory" thrombus with **microabscesses**, but the internal elastic lamina remains intact (unlike vasculitis). * **Treatment:** Absolute smoking cessation is the only definitive way to halt disease progression and prevent amputation.

Question 982: An ECG shows ST elevation in leads V1 and V2. What is the most likely diagnosis?

A. Hyperkalemia (Correct Answer)
B. Hypokalemia
C. Hyperthermia
D. Hypercalcemia

Explanation: **Explanation:** **Hyperkalemia** is a classic "great imitator" on ECGs. While the most famous sign is peaked T-waves, severe hyperkalemia can cause a **"pseudo-infarction" pattern**, characterized by ST-segment elevation, particularly in the right precordial leads (**V1 and V2**) [1]. This occurs due to the alteration of the resting membrane potential and the shortening of the action potential duration, which mimics the current of injury seen in myocardial infarction [1]. In clinical practice, if ST elevation is seen alongside a widened QRS complex or absent P-waves, hyperkalemia should be the first suspicion [1]. **Analysis of Incorrect Options:** * **Hypokalemia:** Typically presents with ST-segment depression, flattened or inverted T-waves, and the appearance of prominent **U-waves**. * **Hyperthermia:** While it can cause sinus tachycardia, it does not typically produce focal ST elevation in V1-V2. (Note: *Hypothermia* causes Osborn/J-waves). * **Hypercalcemia:** Characteristically causes **shortening of the QT interval**. It does not typically cause ST elevation. **NEET-PG High-Yield Pearls:** 1. **Sequence of Hyperkalemia ECG changes:** Peaked T-waves → P-wave flattening/PR prolongation → QRS widening (Sine wave pattern) → Ventricular Fibrillation/Asystole [1]. 2. **Treatment Priority:** Intravenous **Calcium Gluconate** is the first-line treatment to stabilize the cardiac membrane, though it does not lower potassium levels. 3. **Brugada Mimicry:** Hyperkalemia can also induce a "Brugada-like" pattern in V1-V2, which resolves once potassium levels are normalized.

Question 983: What is the most common cause of renal artery stenosis in young females?

A. Atherosclerosis
B. Fibromuscular dysplasia (Correct Answer)
C. Takayasu arteritis
D. Polycystic kidney disease

Explanation: **Explanation:** **Fibromuscular Dysplasia (FMD)** is the most common cause of renal artery stenosis (RAS) in young females (typically aged 15–50). It is a non-inflammatory, non-atherosclerotic vascular disease characterized by abnormal cell growth in the arterial wall. The most common histological subtype is **medial fibroplasia**, which produces the classic **"string of beads"** appearance on angiography due to alternating areas of stenosis and aneurysmal dilation. **Analysis of Incorrect Options:** * **A. Atherosclerosis:** This is the overall most common cause of RAS (approx. 90%), but it typically affects **older males** with cardiovascular risk factors (smoking, diabetes). It usually involves the ostium or proximal third of the renal artery. * **C. Takayasu Arteritis:** While this "pulseless disease" affects young females and can involve the renal arteries, it primarily targets the **aorta and its major branches**. It is an inflammatory large-vessel vasculitis, whereas FMD is a structural dysplasia. * **D. Polycystic Kidney Disease:** This leads to hypertension via cyst expansion and activation of the RAAS system, but it does not cause primary stenosis of the renal arteries. **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** FMD is significantly more common in women (9:1 ratio). * **Location:** FMD typically involves the **distal two-thirds** of the renal artery, whereas atherosclerosis involves the **proximal** portion. * **Clinical Clue:** Suspect FMD in a young woman with sudden-onset or resistant hypertension and an epigastric/flank bruit. * **Treatment:** Percutaneous transluminal angioplasty (PTA) **without stenting** is the treatment of choice for FMD. (Note: Stenting is usually required for atherosclerotic RAS).

Question 984: A continuous murmur is found in all of the following conditions, EXCEPT:

A. Mitral stenosis with mitral regurgitation (Correct Answer)
B. Patent ductus arteriosus
C. Rupture of sinus of Valsalva
D. Systemic arteriovenous fistula

Explanation: ### Explanation The correct answer is **A. Mitral stenosis with mitral regurgitation**. **1. Why Option A is the Correct Answer:** A **continuous murmur** is defined as a murmur that begins in systole and continues without interruption through the second heart sound (S2) into all or part of diastole. This occurs when there is a persistent pressure gradient between two chambers or vessels throughout the entire cardiac cycle. In **Mitral Stenosis (MS) with Mitral Regurgitation (MR)**, the murmurs are distinct and separate (a "to-and-fro" murmur). MR produces a holosystolic murmur, while MS produces a mid-diastolic murmur with presystolic accentuation [1]. There is a brief silence or change in character at S2, meaning the flow is not continuous across the valve in one direction throughout the cycle [2]. **2. Why the Other Options are Incorrect:** * **Patent Ductus Arteriosus (PDA):** This is the classic cause of a continuous "machinery" murmur (Gibson’s murmur). Since aortic pressure is always higher than pulmonary artery pressure, blood flows continuously from the aorta to the pulmonary artery. * **Rupture of Sinus of Valsalva (RSOV):** If the sinus ruptures into a low-pressure chamber (like the right atrium or ventricle), the high aortic pressure ensures a continuous gradient, resulting in a loud continuous murmur. * **Systemic Arteriovenous (AV) Fistula:** A direct communication between a high-pressure artery and a low-pressure vein maintains a pressure gradient during both systole and diastole, creating a continuous bruit/murmur. **3. NEET-PG Clinical Pearls:** * **To-and-Fro Murmur vs. Continuous Murmur:** A "to-and-fro" murmur (e.g., AS + AR) has a gap at S2 [1]. A continuous murmur (e.g., PDA) wraps around S2. * **Common Causes of Continuous Murmurs:** PDA, RSOV, AV fistulas, Coronary AV fistula, Venous hum (benign), and Cruveilhier-Baumgarten syndrome. * **Important Distinction:** In PDA with **Eisenmenger syndrome**, the continuous murmur disappears because the pressure gradient between the aorta and pulmonary artery is lost.

Question 985: In cases of sudden death in a young football player, what is the primary clinical suspicion among the following differentials?

A. Arrhythmogenic right ventricular dysplasia (Correct Answer)
B. Takotsubo cardiomyopathy
C. Atrial septal defect
D. Eisenmenger complex

Explanation: **Explanation:** **1. Why Arrhythmogenic Right Ventricular Dysplasia (ARVD) is correct:** ARVD (or ARVC) is a genetic cardiomyopathy characterized by the fibrofatty replacement of the right ventricular myocardium. This structural change creates a substrate for re-entrant ventricular arrhythmias. It is a classic cause of sudden cardiac death (SCD) in young individuals and athletes, particularly during or immediately after strenuous physical activity. In certain geographic regions (like Italy), it is the leading cause of SCD in young athletes. **2. Why the other options are incorrect:** * **Takotsubo Cardiomyopathy:** Also known as "Broken Heart Syndrome," this is typically triggered by extreme emotional or physical stress and primarily affects post-menopausal women. It presents like an acute coronary syndrome but rarely causes sudden death in young athletes. * **Atrial Septal Defect (ASD):** While a common congenital heart disease, ASD is usually asymptomatic in youth. If untreated, it leads to pulmonary hypertension and heart failure in the 3rd or 4th decade of life, rather than sudden arrhythmic death during sports. * **Eisenmenger Complex:** This represents the end-stage of a left-to-right shunt that has reversed due to severe pulmonary hypertension. Patients are typically cyanotic, have significantly limited exercise tolerance, and would not be participating in competitive football. **Clinical Pearls for NEET-PG:** * **Most common cause of SCD in young athletes (Global):** Hypertrophic Cardiomyopathy (HCM) [1]. * **ECG Hallmark of ARVD:** The **Epsilon wave** (a small notch at the end of the QRS complex in leads V1-V3) and T-wave inversions in right precordial leads. * **Diagnosis:** Often involves Cardiac MRI showing fatty infiltration and RV wall motion abnormalities. * **Management:** Competitive sports are contraindicated; high-risk patients require an Implantable Cardioverter Defibrillator (ICD) [2].

Question 986: Bradycardia occurs in all the following conditions except?

A. Hyperthyroidism (Correct Answer)
B. Increased intracranial pressure
C. Myxedema
D. Normal sleep

Explanation: The correct answer is **Hyperthyroidism** because it is a classic cause of **tachycardia**, not bradycardia. [1] **1. Why Hyperthyroidism is the correct answer:** In hyperthyroidism, excess thyroid hormones ($T_3$ and $T_4$) increase the metabolic rate and enhance the heart's sensitivity to catecholamines. This occurs through the up-regulation of beta-adrenergic receptors in the myocardium. The result is an increased heart rate (tachycardia), increased stroke volume, and often atrial fibrillation. [1] **2. Why the other options are incorrect (Causes of Bradycardia):** * **Increased Intracranial Pressure (ICP):** This triggers the **Cushing Reflex**, a physiological nervous system response to increased ICP that presents as a triad of hypertension, irregular breathing, and **bradycardia**. * **Myxedema (Severe Hypothyroidism):** Low levels of thyroid hormones lead to a generalized slowing of metabolic processes, including a decrease in the firing rate of the SA node and reduced sensitivity to catecholamines, resulting in **bradycardia**. * **Normal Sleep:** During sleep, especially in non-REM stages, there is a physiological increase in vagal (parasympathetic) tone and a decrease in sympathetic activity, which naturally lowers the heart rate. **Clinical Pearls for NEET-PG:** * **Relative Bradycardia:** This is a high-yield concept where the pulse is slower than expected for the degree of fever. Common causes include **Typhoid fever (Faget sign)**, Legionella, Yellow fever, and Brucellosis. * **Drugs causing Bradycardia:** Beta-blockers, Calcium channel blockers (Verapamil, Diltiazem), Digoxin, and Amiodarone. * **Electrolytes:** **Hyperkalemia** is a critical cause of bradycardia and heart blocks.

Question 987: A female has a diastolic blood pressure (DBP) of 100 mm Hg on two consecutive occasions. What is the best initial management?

A. Rest
B. Sedation
C. Antihypertensive drugs (Correct Answer)
D. Check for error in BP machine

Explanation: ### Explanation **Correct Answer: C. Antihypertensive Drugs** The diagnosis of hypertension is established when a patient has a persistently elevated blood pressure (BP) on two or more separate occasions. According to the **JNC-8** and **AHA/ACC guidelines**, a Diastolic Blood Pressure (DBP) of **100 mm Hg** falls into the category of **Stage 2 Hypertension** (defined as SBP ≥140 or DBP ≥90 mm Hg). For a patient with Stage 2 Hypertension confirmed on two consecutive readings, the standard of care is the initiation of **pharmacological therapy** (antihypertensive drugs) alongside lifestyle modifications [1]. The sole objective of antihypertensive therapy is to reduce the incidence of adverse cardiovascular events [2]. Delaying treatment in a patient with a DBP of 100 mm Hg increases the risk of end-organ damage (e.g., stroke, myocardial infarction, or renal failure) [2]. **Analysis of Incorrect Options:** * **A. Rest:** While BP can fluctuate with stress, a reading of 100 mm Hg DBP on two separate occasions indicates a sustained elevation that rest alone will not resolve. * **B. Sedation:** Sedatives are not a treatment for hypertension. Using them to lower BP is clinically inappropriate and masks the underlying vascular pathology. * **D. Check for error in BP machine:** While equipment calibration is important, the question specifies the reading was taken on "two consecutive occasions," implying the measurement is reliable and the clinical focus should shift to management. **Clinical Pearls for NEET-PG:** * **Definition of HTN:** SBP ≥140 and/or DBP ≥90 mm Hg (based on JNC-8). * **Initial Drug Choice:** For non-black patients, start with ACE inhibitors, ARBs, Calcium Channel Blockers (CCB), or Thiazide diuretics [1]. For black patients, CCBs or Thiazides are preferred. * **Hypertensive Urgency vs. Emergency:** Urgency is BP >180/120 without end-organ damage; Emergency involves end-organ damage (e.g., encephalopathy, papilledema) and requires IV antihypertensives [1].

Question 988: A 56-year-old male presents with the sudden onset of excruciating pain. He describes the pain as beginning in the anterior chest, radiating to the back, and then moving downward into the abdomen. His blood pressure is found to be 160/115. ECG shows no changes. An abdominal x-ray reveals a "double-barrel" aorta. This abnormality most likely results from?

A. A microbial infection
B. Loss of elastic tissue in the media (Correct Answer)
C. A congenital defect in the wall of the aorta
D. Atherosclerosis of the abdominal aorta

Explanation: ### Explanation The clinical presentation of sudden, excruciating "tearing" chest pain radiating to the back and moving downward, combined with hypertension and a "double-barrel" aorta on imaging, is pathognomonic for **Aortic Dissection** [1]. **1. Why the Correct Answer is Right:** Aortic dissection occurs when a tear in the aortic intima allows blood to surge into the media, creating a false lumen (the "double-barrel" appearance) [3]. The fundamental underlying pathology is **cystic medial necrosis** or **medial degeneration**, characterized by the **loss of elastic tissue** and smooth muscle cells in the tunica media. This weakens the aortic wall, making it susceptible to the longitudinal cleavage caused by high-pressure blood flow. Hypertension is the most common predisposing factor that triggers this process [1]. **2. Why the Other Options are Wrong:** * **A. Microbial infection:** This leads to a **Mycotic Aneurysm**, typically presenting as a localized, pulsatile mass with signs of sepsis, not a longitudinal dissection. * **C. Congenital defect in the wall:** While conditions like Marfan syndrome (connective tissue disorder) predispose patients to dissection [1], the question describes a 56-year-old hypertensive male, where acquired medial degeneration is the primary mechanism. * **D. Atherosclerosis:** This is the primary cause of **Abdominal Aortic Aneurysms (AAA)**. While atherosclerosis can coexist with dissection, it typically leads to wall thickening and dilation rather than the creation of a false lumen (dissection) [2]. **3. NEET-PG High-Yield Pearls:** * **Stanford Classification:** Type A involves the ascending aorta (Surgical emergency); Type B involves only the descending aorta (Medical management) [1]. * **Gold Standard Investigation:** CT Angiography (CTA) is the investigation of choice [3]. * **Classic Sign:** "Double-barrel" aorta on imaging or "Widened mediastinum" on Chest X-ray [3]. * **Management:** Immediate BP control using IV Beta-blockers (e.g., Labetalol) to reduce the heart rate and the rate of rise of aortic pressure (dP/dt).

Question 989: What is true about pseudohypertension?

A. It is seen in the elderly.
B. Only systolic blood pressure is high.
C. Arteriosclerosis is a feature.
D. All of the above. (Correct Answer)

Explanation: **Explanation:** **Pseudohypertension** refers to a clinical situation where the blood pressure (BP) measured by a sphygmomanometer is falsely elevated compared to the actual intra-arterial pressure. 1. **Why Option D is Correct:** * **Elderly Population (Option A):** It is most commonly seen in the elderly due to age-related vascular changes. * **Arteriosclerosis (Option C):** The underlying mechanism is severe **arteriosclerosis** (calcification of the tunica media). The brachial artery becomes so rigid and "pipe-like" that the blood pressure cuff cannot easily compress it [1]. To occlude the artery and stop the pulse, the cuff must be inflated to pressures much higher than the actual systolic pressure. * **High Systolic BP (Option B):** While both readings can be affected, a marked elevation in systolic BP is a hallmark. Because the cuff struggles to collapse the stiff vessel wall, the manometer reflects the pressure needed to overcome arterial stiffness rather than the true intraluminal pressure [1]. 2. **Clinical Pearls for NEET-PG:** * **Osler’s Maneuver:** This is the classic physical exam finding for pseudohypertension. It is considered positive if the **radial or brachial artery remains palpable** (though pulseless) even when the BP cuff is inflated above the systolic pressure. * **When to Suspect:** Suspect pseudohypertension in an elderly patient who has very high BP readings but **no evidence of end-organ damage** (e.g., normal fundi, normal LVH on ECG) or who develops symptoms of hypotension (syncope/dizziness) when started on even low-dose antihypertensive therapy. * **Gold Standard Diagnosis:** The definitive way to rule out pseudohypertension is via **direct intra-arterial pressure measurement**.

Question 990: All right-sided events tend to increase with inspiration, except:

A. Pulmonary ejection click (Correct Answer)
B. Tricuspid stenosis
C. Tricuspid regurgitation
D. Pulmonic regurgitation

Explanation: **Explanation:** The fundamental physiological principle here is that **inspiration** increases venous return to the right side of the heart (due to negative intrathoracic pressure). This increased volume typically intensifies right-sided murmurs and sounds—a phenomenon known as **Carvallo’s Sign** [1]. **Why Pulmonary Ejection Click is the exception:** The pulmonary ejection click is the **only** right-sided sound that **decreases** in intensity during inspiration. In pulmonary stenosis, the increased venous return during inspiration raises right ventricular end-diastolic pressure. This causes the stenotic pulmonary valve to "dome" upward prematurely before systole begins. Consequently, when the ventricle actually contracts, the valve has less distance to travel, resulting in a softer or absent opening click. **Analysis of Incorrect Options:** * **Tricuspid Stenosis (B):** The diastolic murmur increases during inspiration because the increased blood flow across the narrowed tricuspid valve increases turbulence. * **Tricuspid Regurgitation (C):** The holosystolic murmur increases with inspiration (Carvallo’s sign) due to the larger volume of blood being ejected back into the right atrium [2]. * **Pulmonic Regurgitation (D):** The decrescendo diastolic murmur (Graham Steell murmur) increases with inspiration as more blood is available in the pulmonary artery to leak back into the right ventricle. **High-Yield Clinical Pearls for NEET-PG:** * **Carvallo’s Sign:** Increase in intensity of tricuspid regurgitation murmur during inspiration; helps differentiate it from mitral regurgitation. * **Left-sided events:** Generally increase during **expiration** (as blood is squeezed from the lungs into the left atrium). * **HOCM and Mitral Valve Prolapse:** These are exceptions to the general rules; their murmurs typically **decrease** with increased venous return (e.g., squatting/inspiration) and increase with decreased venous return (e.g., Valsalva).

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Cardiology — MCQs

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