Cardiology — MCQs

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?

Cardiology Indian Medical PG Practice Questions and MCQs

Question 861: A patient presented with pulsating varicose veins of the lower limb. What is the most probable diagnosis?

A. Klippel Trenaunay syndrome (Correct Answer)
B. Tricuspid regurgitation
C. Deep Vein Thrombosis (DVT)
D. Right ventricular failure

Explanation: ### Explanation **Correct Answer: A. Klippel Trenaunay Syndrome (KTS)** The hallmark of **Klippel Trenaunay Syndrome** is a triad of: 1. **Port-wine stain** (Capillary malformations) 2. **Soft tissue and bony hypertrophy** of the affected limb 3. **Atypical varicose veins** The presence of **pulsating varicose veins** in KTS is due to the underlying **Arteriovenous (AV) malformations/fistulae**. These high-pressure arterial communications transmit pulsations directly into the low-pressure venous system, causing the veins to pulsate and dilate. --- ### Why the other options are incorrect: * **B. Tricuspid Regurgitation (TR):** While severe TR causes systolic pulsations, these are typically seen in the **Internal Jugular Vein (IJV)** and the **liver** (pulsatile hepatomegaly). It does not typically cause localized pulsating varicose veins in the lower limbs. * **C. Deep Vein Thrombosis (DVT):** DVT presents with calf pain, swelling, and warmth [1]. While it can lead to secondary varicose veins (Post-thrombotic syndrome) due to venous hypertension, these veins do **not** pulsate. * **D. Right Ventricular Failure (RVF):** RVF leads to systemic venous congestion, manifesting as elevated JVP, pedal edema, and ascites. While it may exacerbate existing varicosities, it does not impart a pulsatile quality to them. --- ### High-Yield Clinical Pearls for NEET-PG: * **Parkes-Weber Syndrome:** Similar to KTS but specifically characterized by significant, high-flow AV fistulae. Some examiners use KTS and Parkes-Weber interchangeably when discussing pulsating veins. * **Kasabach-Merritt Syndrome:** A potential complication of large vascular malformations where platelets are sequestered, leading to consumptive coagulopathy. * **Diagnosis:** Color Doppler is the initial investigation of choice to identify AV communications. MRI/MRA is used for definitive anatomical mapping.

Question 862: Left ventricular S3 is seen in which of the following conditions?

A. Aortic Stenosis (AS)
B. Mitral Stenosis (MS)
C. Mitral Regurgitation (MR) (Correct Answer)
D. Atrial Septal Defect (ASD)

Explanation: ### Explanation The **Third Heart Sound (S3)**, also known as the ventricular gallop, occurs during the early phase of diastole (rapid ventricular filling). It is produced when a large volume of blood rushes into a dilated or compliant ventricle, causing sudden deceleration of blood flow and vibration of the ventricular walls. **Why Mitral Regurgitation (MR) is correct:** In chronic MR, the left atrium receives both the normal pulmonary venous return and the regurgitant volume from the left ventricle. During the subsequent diastole, this massive volume is dumped into the left ventricle. This **volume overload** leads to a rapid filling phase and ventricular dilatation, which are the classic physiological triggers for an S3. In these cases, increased forward flow through the mitral valve specifically causes a loud third heart sound [1]. **Analysis of Incorrect Options:** * **Aortic Stenosis (AS):** This is a condition of **pressure overload** leading to concentric Left Ventricular Hypertrophy (LVH). A stiff, non-compliant ventricle is associated with an **S4** (atrial gallop), not an S3. * **Mitral Stenosis (MS):** An S3 cannot occur in significant MS because the stenotic valve restricts the rapid filling of the left ventricle. In fact, the presence of an S3 effectively rules out significant MS. * **Atrial Septal Defect (ASD):** While ASD can cause a **Right Ventricular S3** due to right-sided volume overload [2], the question specifically asks for a **Left Ventricular S3**. **NEET-PG High-Yield Pearls:** * **S3 is physiological** in children, young adults (<40 years), and pregnancy. * **S3 is pathological** in adults (usually >40 years) and signifies **Ventricular Failure** or **Volume Overload** (e.g., MR, VSD, PDA). * **Best heard:** With the **bell** of the stethoscope at the apex in the left lateral decubitus position [2]. * **Mnemonic:** S3 corresponds to the cadence of the word "Ken-tuc-ky."

Question 863: A 45-year-old smoker presents with sudden onset unrelenting chest pain and loss of peripheral pulses. Blood pressure measured in both arms is different. What is the most likely first differential diagnosis?

A. Mirizzi syndrome
B. Aortic dissection (Correct Answer)
C. Viral pericarditis
D. Spontaneous pneumothorax

Explanation: The clinical presentation of sudden, unrelenting chest pain associated with a **blood pressure discrepancy** between the arms and **loss of peripheral pulses** is a classic triad for **Aortic Dissection** [1]. **1. Why Aortic Dissection is correct:** Aortic dissection occurs when a tear in the tunica intima allows blood to surge into the media, creating a "false lumen." As the dissection propagates, it can involve the origins of major arteries (like the subclavian or iliac arteries). This leads to **malperfusion syndrome**, manifesting as asymmetrical blood pressure readings (typically a difference >20 mmHg) and absent or diminished peripheral pulses. The pain is usually described as "tearing" or "ripping" and radiates to the back [1]. **2. Why other options are incorrect:** * **Mirizzi Syndrome:** This is a rare complication of gallstone disease where a stone in the cystic duct compresses the common hepatic duct, causing obstructive jaundice. It has no correlation with chest pain or pulse deficits. * **Viral Pericarditis:** Presents with pleuritic chest pain that improves upon leaning forward [2]. It does not cause pulse deficits or BP discrepancies. * **Spontaneous Pneumothorax:** Presents with sudden chest pain and dyspnea with decreased breath sounds on the affected side. While it can cause hypotension (if tension develops), it does not cause asymmetrical limb pressures. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** CT Angiography (CTA) is the investigation of choice in stable patients. Transesophageal Echocardiogram (TEE) is preferred in unstable patients. * **Stanford Classification:** Type A involves the ascending aorta (Surgical emergency); Type B involves only the descending aorta (Medical management) [1]. * **Risk Factors:** Hypertension (most common), Marfan Syndrome, and smoking [1]. * **Chest X-ray:** May show a "widened mediastinum" (seen in ~80% of cases).

Question 864: Mitral stenosis is associated with which of the following?

A. Right ventricular hypertrophy (Correct Answer)
B. Left ventricular hypertrophy
C. Left axis deviation
D. QRS complex

Explanation: **Explanation:** In **Mitral Stenosis (MS)**, the narrowing of the mitral valve orifice creates a pressure gradient between the left atrium (LA) and the left ventricle (LV). This leads to a sequence of hemodynamic changes [1]: 1. **LA Pressure Elevation:** To maintain flow across the stenotic valve, LA pressure rises, leading to LA enlargement. 2. **Pulmonary Hypertension:** The increased LA pressure is transmitted backward into the pulmonary veins and capillaries, eventually causing reactive pulmonary arterial hypertension. 3. **Right Ventricular Pressure Overload:** The right ventricle (RV) must pump against this high pulmonary resistance, leading to **Right Ventricular Hypertrophy (RVH)** and, eventually, right-sided heart failure [1]. **Analysis of Options:** * **Option A (Correct):** RVH is a hallmark of chronic, severe MS due to secondary pulmonary hypertension [1]. * **Option B (Incorrect):** The LV is typically "protected" in isolated MS. Because filling is restricted, the LV is often normal or even small/underfilled. LVH suggests co-existing mitral regurgitation or aortic valve disease. * **Option C (Incorrect):** MS typically causes **Right Axis Deviation (RAD)** due to RVH. Left axis deviation is more characteristic of conditions like Left Anterior Fascicular Block or LVH. * **Option D (Incorrect):** This is a general ECG term and not a specific finding associated with MS. **High-Yield Clinical Pearls for NEET-PG:** * **ECG Findings in MS:** Look for **"P mitrale"** (broad, notched P waves in Lead II indicating LA enlargement) and signs of RVH (Tall R wave in V1). * **Most Common Cause:** Rheumatic heart disease remains the leading cause worldwide. * **Auscultation:** Characterized by a loud S1, an **Opening Snap (OS)**, and a mid-diastolic rumbling murmur heard best at the apex in the left lateral decubitus position [1]. * **Complication:** Atrial Fibrillation is highly common due to LA stretching, increasing the risk of systemic thromboembolism [1].

Question 865: All of the following are used in the initial management of acute life-threatening cardiogenic pulmonary edema, except?

A. Digoxin (Correct Answer)
B. Morphine
C. Furosemide
D. Positive pressure ventilation

Explanation: The management of acute life-threatening cardiogenic pulmonary edema focuses on reducing preload, afterload, and improving oxygenation [1]. **Why Digoxin is the Correct Answer (The "Except"):** Digoxin is a positive inotrope that acts by inhibiting the Na+/K+ ATPase pump. However, it has a **slow onset of action** (taking hours to reach peak effect) and a narrow therapeutic index. In the acute phase of pulmonary edema, it does not provide rapid hemodynamic stabilization. It is primarily indicated for rate control in patients with atrial fibrillation or for chronic heart failure management, not as a first-line agent for acute respiratory distress. **Why the other options are used:** * **Furosemide (Loop Diuretic):** The cornerstone of treatment [2]. It acts via rapid venodilation (reducing preload) within minutes, followed by diuresis [2]. * **Morphine:** Traditionally used to reduce anxiety and sympathetic surge. It acts as a venodilator, reducing preload and the work of breathing. * **Positive Pressure Ventilation (CPAP/BiPAP):** Increases intrathoracic pressure, which decreases venous return (preload) and pushes fluid out of the alveoli, rapidly improving oxygenation and reducing the need for intubation. **Clinical Pearls for NEET-PG:** * **LMNOP Mnemonic:** Standard acute management includes **L**asix (Furosemide), **M**orphine, **N**itrates (Nitroglycerin), **O**xygen, and **P**ositioning (sitting upright) / **P**ositive Pressure Ventilation. * **Nitroglycerin** is the preferred vasodilator to reduce both preload and afterload if the blood pressure allows. * **Inotropes** like Dobutamine or Milrinone are preferred over Digoxin if pharmacological inotropic support is acutely required (e.g., in cardiogenic shock) [1].

Question 866: A 70-year-old man presents with isolated systolic hypertension. His blood pressure is 170/80 mm Hg, and physical examination reveals normal heart and lungs. He has no other medical conditions. For a patient with high blood pressure, select the most appropriate medication.

A. Thiazides (Correct Answer)
B. Spironolactone
C. Clonidine
D. Prazosin

Explanation: **Explanation:** **1. Why Thiazides are correct:** The patient presents with **Isolated Systolic Hypertension (ISH)**, defined as a systolic BP ≥140 mmHg with a diastolic BP <90 mmHg. This condition is common in the elderly due to age-related arterial stiffness and decreased compliance of the aorta [1]. Large-scale clinical trials (such as SHEP and ALLHAT) have established **Thiazide-type diuretics** (e.g., Chlorthalidone, Hydrochlorothiazide) and **Calcium Channel Blockers (CCBs)** as the first-line agents for ISH. They are highly effective in reducing stroke risk and cardiovascular events in this specific demographic [1]. **2. Why the other options are incorrect:** * **Spironolactone (B):** This is a potassium-sparing diuretic/mineralocorticoid receptor antagonist. It is typically used as an add-on therapy (4th line) in resistant hypertension or in patients with heart failure (HFrEF). * **Clonidine (C):** A centrally acting alpha-2 agonist. It is not a first-line agent due to its side effect profile (sedation, dry mouth) and the risk of severe rebound hypertension if doses are missed. * **Prazosin (D):** An alpha-1 blocker. It is associated with "first-dose hypotension" and is not a primary choice for ISH [2]. It is generally reserved for hypertensive patients with concomitant Benign Prostatic Hyperplasia (BPH). **3. NEET-PG High-Yield Pearls:** * **Definition of ISH:** Widened pulse pressure (Systolic ↑, Diastolic normal/low) [1]. * **Drug of Choice (DOC):** Thiazides or Long-acting Dihydropyridine CCBs (e.g., Amlodipine) [1]. * **Thiazide Side Effects:** Remember the "Hypo-Hyper" rule: **Hypo**kalemia, **Hypo**natremia, **Hyper**uricemia, **Hyper**calcemia, and **Hyper**glycemia. * **JNC-8 Guidelines:** For the general elderly population (≥60 years), the BP goal is <150/90 mmHg, though more recent guidelines (ACC/AHA) suggest stricter targets (<130/80 mmHg) if tolerated.

Question 867: Which of the following conditions is characterized by a collapsing or water-hammer pulse?

A. Aortic regurgitation (Correct Answer)
B. Ischemic heart disease
C. Pericardial tamponade
D. Severe left ventricular failure

Explanation: **Explanation:** The **collapsing pulse** (also known as **Water-hammer** or **Corrigan’s pulse**) is a classic physical finding characterized by a rapid upstroke followed by a sudden, forceful descent [1]. **1. Why Aortic Regurgitation (AR) is correct:** The pathophysiology of AR involves two main factors: * **Increased Stroke Volume:** During diastole, blood leaks back from the aorta into the Left Ventricle (LV). This increases the end-diastolic volume, leading to a more forceful contraction (Frank-Starling law) and a rapid systolic upstroke [1]. * **Low Diastolic Pressure:** The rapid runoff of blood back into the LV and into the peripheral circulation causes the arterial pressure to drop precipitously during diastole [1], [4]. The resulting **wide pulse pressure** (high systolic, very low diastolic) creates the "collapsing" sensation felt best by elevating the patient's arm and palpating with the palmar surface of the fingers [1]. **2. Why the other options are incorrect:** * **Ischemic Heart Disease:** Usually presents with a normal or weak pulse (pulsus parvus) if myocardial contractility is significantly impaired [2]. * **Pericardial Tamponade:** Characterized by **Pulsus Paradoxus** (an exaggerated drop in systolic BP >10 mmHg during inspiration), not a collapsing pulse [3]. * **Severe LV Failure:** Results in **Pulsus Alternans** (alternating strong and weak beats) or **Pulsus Parvus et Tardus** (weak and delayed pulse) due to low cardiac output [2], [3]. **Clinical Pearls for NEET-PG:** * **Other causes of Collapsing Pulse:** Patent Ductus Andreas (PDA), Large AV fistulas, Hyperthyroidism, Severe Anemia, and Beriberi. * **Associated AR Signs:** **Quincke’s sign** (capillary pulsations), **De Musset’s sign** (head nodding), and **Duroziez’s sign** (femoral murmurs) [1], [4]. * **Pulsus Bisferiens:** Often seen in combined AR + AS or HOCM.

Question 868: What is the ECG diagnosis of a fresh myocardial infarction?

A. QT interval prolongation
B. P mitrale
C. ST segment elevation (Correct Answer)
D. ST segment depression

Explanation: **Explanation:** The hallmark ECG finding of a **fresh (acute) myocardial infarction** is **ST-segment elevation** [1]. This occurs due to a "current of injury." When a coronary artery is acutely and completely occluded, the underlying myocardium becomes transmurally ischemic [2]. This alters the electrical potential of the resting membrane, causing a shift in the ST segment away from the baseline (isoelectric line) in the leads overlying the injured area [4]. This is the defining feature of an **STEMI (ST-Elevation Myocardial Infarction)**. **Analysis of Incorrect Options:** * **A. QT interval prolongation:** This represents delayed ventricular repolarization. While it can be seen in electrolyte imbalances (hypocalcemia) or drug toxicities, it is not a diagnostic feature of an acute MI. * **B. P mitrale:** This refers to a broad, notched P-wave in Lead II, signifying **left atrial enlargement**, typically seen in mitral stenosis, not acute ischemia. * **C. ST segment depression:** While this indicates myocardial ischemia (NSTEMI or angina), it represents subendocardial injury rather than the transmural injury characteristic of a "fresh" or complete infarction. **High-Yield Clinical Pearls for NEET-PG:** * **Evolution of STEMI ECG:** Hyperacute T-waves (earliest sign) → ST-elevation → Q-wave formation → T-wave inversion [1]. * **Reciprocal Changes:** Look for ST-depression in leads opposite to the area of elevation (e.g., ST-depression in II, III, aVF during a lateral MI) [1]. * **Pathological Q-waves:** These usually signify a completed or old infarction (necrosis) rather than a "fresh" one [1]. * **New LBBB:** A new-onset Left Bundle Branch Block in the presence of chest pain is considered a STEMI equivalent [3].

Question 869: The second heart sound (S2) is best appreciated in which of the following areas?

A. 3rd left intercostal space (Correct Answer)
B. 2nd right intercostal space
C. 4th left intercostal space
D. 5th left intercostal space

Explanation: **Explanation:** The **second heart sound (S2)** is produced by the closure of the semilunar valves (Aortic and Pulmonary) at the onset of ventricular diastole [1]. While the components of S2 are traditionally associated with the 2nd intercostal spaces, the sound as a whole is **best appreciated at the 3rd left intercostal space**, also known as **Erb’s point**. 1. **Why Option A is Correct:** Erb’s point (3rd left ICS) is the "center" of the precordium where the sounds from both the aortic and pulmonary valves radiate and converge. It is the optimal location to hear the S2, its splitting (A2 and P2), and early diastolic murmurs (like Aortic Regurgitation) [2]. 2. **Why Other Options are Incorrect:** * **Option B (2nd right ICS):** This is the classic **Aortic area**. While A2 is loud here, it is not the best place to appreciate the combined S2 or its splitting [3]. * **Option C (4th left ICS):** This is generally the **Tricuspid area**, where the first heart sound (S1) and right-sided gallops are better heard. * **Option D (5th left ICS):** Located at the mid-clavicular line, this is the **Mitral area (Apex)**, where S1 is loudest [3]. **High-Yield Clinical Pearls for NEET-PG:** * **S2 Splitting:** Physiological splitting (A2 followed by P2) increases during **inspiration** due to increased venous return to the right heart, delaying pulmonary valve closure. * **Wide Fixed Splitting:** Pathognomonic for **Atrial Septal Defect (ASD)**. * **Reverse (Paradoxical) Splitting:** Seen in conditions that delay aortic closure, such as **Left Bundle Branch Block (LBBB)** or severe **Aortic Stenosis**. * **Loud P2:** A key clinical sign of **Pulmonary Hypertension** [3].

Question 870: 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?

A. Open lung biopsy
B. Pulmonary angiography
C. Cardiac catheterization (Correct Answer)
D. Noninvasive exercise testing

Explanation: **Explanation:** The clinical presentation of dyspnea, fatigue, signs of right heart failure (elevated JVP with prominent **c-v waves** indicating tricuspid regurgitation), and evidence of right ventricular hypertrophy (RVH) in a young woman strongly suggests **Pulmonary Arterial Hypertension (PAH)**. **1. Why Cardiac Catheterization is Correct:** Right heart catheterization (RHC) is the **gold standard** and mandatory diagnostic test to confirm pulmonary hypertension. It allows for the direct measurement of: * **Mean Pulmonary Artery Pressure (mPAP):** ≥20 mmHg at rest. * **Pulmonary Capillary Wedge Pressure (PCWP):** ≤15 mmHg (to rule out left heart disease). * **Pulmonary Vascular Resistance (PVR):** ≥2 Wood units. It also allows for **vasoreactivity testing** (using inhaled nitric oxide), which is crucial for determining if the patient will respond to Calcium Channel Blockers (CCBs). **2. Why Other Options are Incorrect:** * **Open lung biopsy:** While it shows characteristic "plexiform lesions," it is invasive, carries high surgical risk in PH patients, and is rarely required for diagnosis. * **Pulmonary angiography:** Primarily used to diagnose Chronic Thromboembolic Pulmonary Hypertension (CTEPH) by visualizing filling defects; it does not provide the hemodynamic measurements needed to define PAH. * **Noninvasive exercise testing:** Useful for assessing functional capacity (e.g., 6-minute walk test), but cannot confirm the diagnosis or measure intracardiac pressures. **NEET-PG High-Yield Pearls:** * **Definition Update:** The 2022 ESC/ERS guidelines lowered the threshold for PH from mPAP ≥25 mmHg to **mPAP >20 mmHg**. * **Physical Signs:** Loud P2 (earliest sign), Left parasternal heave (RVH), and Graham Steell murmur (pulmonary regurgitation). * **ECG Findings:** Right axis deviation, R/S ratio >1 in V1, and "P-pulmonale" (tall peaked P waves). * **Drug of Choice:** If vasoreactive, use CCBs (Amlodipine/Nifedipine). If not, use Bosentan (Endothelin receptor antagonist) or Sildenafil (PDE-5 inhibitor).

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Cardiology — MCQs

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