Cardiology Practice Questions

Q: Wellen's syndrome suggests which of the following cardiac conditions?

Unstable angina. **Wellen’s Syndrome** is a clinical-electrocardiographic pattern highly specific for critical stenosis of the **proximal Left Anterior Descending (LAD) artery**. It is considered a pre-infarction stage of **Unstable Angina (UA)**. The underlying pathophysiology involves a sudden occlusion of the LAD followed by spontaneous reperfusion, leading to characteristic T-wave changes. Because the artery is critically narrowed but not permanently occluded, it falls under the spectrum of Acute Coronary Syndrome (specifically UA) [1], carrying a high risk of progressing to an extensive anterior wall myocardial infarction (STEMI) if not managed with urgent coronary intervention. **Analysis of Options:** * **Option A (Stable Angina):** This involves predictable chest pain on exertion due to fixed atherosclerotic plaques [2]. Wellen’s syndrome represents an acute, unstable situation with high risk of imminent infarction. * **Option C (Ludwig’s Angina):** This is a non-cardiac condition. It is a rapidly spreading cellulitis of the submandibular space, usually of odontogenic origin. * **Option D (Prinzmetal Angina):** Also known as variant angina, this is caused by coronary artery vasospasm rather than critical fixed stenosis. It typically presents with transient ST-segment elevation during pain, not the specific T-wave patterns of Wellen’s. **High-Yield Clinical Pearls for NEET-PG:** * **ECG Criteria:** Occurs during a **pain-free interval**. Look for biphasic T-waves (Type A) or deep, symmetrical T-wave inversions (Type B) in leads V2–V3. * **Cardiac Enzymes:** Usually normal or only minimally elevated. * **Management Warning:** Stress tests (Treadmill Test) are **contraindicated** as they can trigger a fatal MI. The definitive treatment is Cardiac Catheterization.

Q: "Cannon" waves are seen in which of the following conditions?

Complete heart block. **Explanation:** **Cannon "a" waves** occur due to **atrioventricular (AV) dissociation**. They are giant jugular venous pulsations produced when the right atrium contracts against a **closed tricuspid valve**. In **Complete Heart Block (Option A)**, the atria and ventricles beat independently [1]. Occasionally, the P-wave (atrial contraction) coincides with the QRS complex (ventricular contraction/systole); since the tricuspid valve is closed during ventricular systole, the atrial pressure is reflected backward into the jugular vein, creating the "cannon" wave [3]. **Analysis of Incorrect Options:** * **Left Ventricular Hypertrophy (Option B):** This affects the left side of the heart and does not typically manifest as specific JVP waveform changes unless it leads to right-sided heart failure. * **Mitral Stenosis (Option C):** This leads to a **prominent "a" wave** (due to increased resistance to right ventricular filling if pulmonary hypertension develops), but not a "cannon" wave. * **Atrial Fibrillation (Option D):** Characterized by the **absence of "a" waves** because there is no coordinated atrial contraction [4]. **Clinical Pearls for NEET-PG:** * **Regular Cannon Waves:** Seen in Junctional Rhythm or SVT. * **Irregular Cannon Waves:** Pathognomonic for **Complete Heart Block** [2] or Ventricular Tachycardia (VT). * **Giant/Prominent "a" waves:** Seen in Tricuspid Stenosis, Pulmonary Stenosis, and Right Ventricular Hypertrophy (conditions where the atrium pushes against a restricted opening or stiff ventricle). * **Giant "v" waves:** Characteristic of **Tricuspid Regurgitation**.

Q: The first heart sound is soft in all of the following conditions, except:

Short PR interval. ### Explanation The **First Heart Sound (S1)** is primarily produced by the closure of the Mitral (M1) and Tricuspid (T1) valves [1]. The intensity of S1 depends on the position of the valve leaflets at the onset of ventricular systole and the rate of pressure rise within the ventricle. **1. Why "Short PR interval" is the correct answer:** In a **Short PR interval** (e.g., WPW syndrome), the time between atrial and ventricular contraction is brief. The ventricles contract while the mitral valve leaflets are still wide apart (deep in the ventricular cavity). This results in the leaflets traveling a greater distance and closing with high velocity, producing a **Loud S1**. Therefore, it is the exception to the "soft S1" conditions. **2. Why the other options are incorrect (Causes of Soft S1):** * **Mitral Regurgitation:** The leaflets often fail to coapt properly, or the rate of pressure rise is altered, leading to a diminished S1 [2]. * **Calcified Valve:** In severe mitral stenosis with a rigid, calcified valve, the leaflets lose their mobility and cannot "snap" shut, resulting in a muffled or soft S1 [3]. * **Ventricular Septal Defect (VSD):** Large shunts can lead to prolonged ventricular filling or altered hemodynamics that soften the closure sound. **3. NEET-PG High-Yield Pearls:** * **Loud S1:** Short PR interval, Mild-to-Moderate Mitral Stenosis (pliable valve), Tachycardia, Hyperdynamic states (Anemia, Pregnancy, Thyrotoxicosis). * **Soft S1:** Long PR interval (1st-degree heart block), Severe/Calcified Mitral Stenosis, Mitral Regurgitation, Obesity/COPD (increased chest wall thickness), Heart Failure. * **Variable S1:** Atrial Fibrillation and Complete Heart Block (AV dissociation).

Q: In Marfan's syndrome, aortic aneurysm occurs most commonly in which part of the aorta?

Ascending aorta. **Explanation:** **1. Why the Ascending Aorta is Correct:** Marfan’s syndrome is an autosomal dominant connective tissue disorder caused by a mutation in the **FBN1 gene**, which encodes **fibrillin-1** [1]. This deficiency leads to **cystic medial necrosis** (degeneration of the elastic fibers in the tunica media). The ascending aorta, particularly the **aortic root (Sinus of Valsalva)**, is the site of the highest hemodynamic stress and wall tension (Laplace’s Law). Because this segment has the highest concentration of elastic lamellae, it is most susceptible to progressive dilation, leading to aneurysm formation and potentially Type A aortic dissection [2]. **2. Why the Other Options are Incorrect:** * **B & D (Descending Aorta and Aortic Arch):** While these segments can be involved in Marfan’s syndrome, they are significantly less common than the ascending aorta. Dilation here usually occurs secondary to an extension of an ascending dissection or in much later stages of the disease [2]. * **C (Abdominal Aorta):** Abdominal aortic aneurysms (AAA) are typically associated with **atherosclerosis** and smoking, rather than genetic connective tissue disorders [1]. In Marfan’s, the pathology is predominantly thoracic. **3. Clinical Pearls for NEET-PG:** * **Most common cause of death:** Aortic root dilatation leading to rupture or dissection. * **Cardiac Murmur:** Aortic Regurgitation (early diastolic murmur) is common due to annular stretching. * **Echocardiography:** The gold standard for serial monitoring of aortic root diameter. * **Surgery Indication:** Prophylactic replacement is usually recommended when the diameter reaches **≥50 mm** (or ≥45 mm if there are additional risk factors). * **Associated Sign:** Look for **Steinberg sign** (thumb sign) and **Walker-Murdoch sign** (wrist sign) on physical exam.

Question 1

Wellen's syndrome suggests which of the following cardiac conditions?

Accepted Answer

Unstable angina

Answer

Stable angina

Answer

Ludwig's angina

Answer

Prinzmetal angina

Question 2

A patient with mitral regurgitation and atrial fibrillation presents with syncope. On examination, the patient has a heart rate of 55. What is the most probable cause?

Accepted Answer

Digitalis toxicity

Answer

Incomplete heart block

Answer

Stroke

Answer

Subarachnoid hemorrhage

Question 3

"Cannon" waves are seen in which of the following conditions?

Accepted Answer

Complete heart block

Answer

Left ventricular hypertrophy

Answer

Mitral stenosis

Answer

Atrial fibrillation

Question 4

Which of the following is least likely to be associated with Infective Endocarditis?

Accepted Answer

Small Atrial Septal Defect (ASD)

Answer

Small Ventricular Septal Defect (VSD)

Answer

Mild Mitral Regurgitation (MR)

Answer

Mild Mitral Stenosis (MS)

Question 5

A wide split fixed second heart sound is heard in which of the following conditions?

Accepted Answer

Atrial Septal Defect (ASD)

Answer

Normal individuals

Answer

Left bundle branch block

Answer

Ventricular Septal Defect (VSD)

Question 6

What is the treatment of choice in patients with congestive heart failure with ejection fraction < 40% and normal fluid levels achieved?

Accepted Answer

ACE inhibitors + Beta blockers

Answer

ACE inhibitors + Diuretics

Answer

ACE inhibitors + ARBs

Answer

ACE inhibitors + CCBs

Question 7

Which of the following conditions is most likely to occur in a patient with the following hemodynamic data: Pressures: RA = 12 mm Hg, RV = 50/12 mm Hg, PA=50/15 mm Hg, PA wedge pressure = 8 mm Hg, Aorta = 80/60 mm Hg, Cardiac Index = 1.4 L/min/m², SVR= 1800 dynes·sec/cm⁵, PVR=500 dynes·sec/cm⁵?

Accepted Answer

Acute massive pulmonary embolism

Answer

Acute myocardial infarction with left ventricular failure and cardiogenic shock

Answer

Hypovolemic shock following gastroenteritis

Answer

Early septic shock

Question 8

The first heart sound is soft in all of the following conditions, except:

Accepted Answer

Short PR interval

Answer

Ventricular septal defect

Answer

Mitral regurgitation

Answer

Calcified valve

Question 9

In Marfan's syndrome, aortic aneurysm occurs most commonly in which part of the aorta?

Accepted Answer

Ascending aorta

Answer

Descending aorta

Answer

Abdominal aorta

Answer

Aortic arch

Question 10

Which of the following statements is NOT true regarding the hepatojugular reflux?

Accepted Answer

It is associated with decreased afterload.

Answer

It is seen in pulmonary stenosis.

Answer

It is seen in tricuspid regurgitation.

Answer

It may indicate right heart failure.

Cardiology — MCQs

Cardiology — MCQs

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