Cardiology Practice Questions

Q: What is diagnostic of a fresh myocardial infarction on ECG?

ST segment elevation. **Explanation:** The hallmark of an acute (fresh) transmural myocardial infarction is **ST-segment elevation** [2]. This occurs due to a "current of injury" resulting from severe, total occlusion of a coronary artery [2]. When the myocardium becomes acutely ischemic and damaged, it remains partially depolarized, creating a voltage gradient between the injured and healthy tissue, which manifests on the ECG as an elevation of the ST segment above the isoelectric line [2]. **Analysis of Options:** * **ST-segment elevation (Correct):** Diagnostic of an acute STEMI (ST-Elevation Myocardial Infarction) [1]. It indicates transmural injury and is the primary trigger for immediate reperfusion therapy (thrombolysis or PCI). * **QT interval prolongation:** This represents delayed ventricular repolarization. While it can be seen in electrolyte imbalances (hypocalcemia) or drug toxicities, it is not diagnostic of an acute MI. * **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. * **ST-segment depression:** This usually indicates subendocardial ischemia, NSTEMI, or reciprocal changes [1]. While significant, it is not the classic "diagnostic" sign of a fresh transmural infarction. **High-Yield Clinical Pearls for NEET-PG:** * **Evolution of ECG in MI:** Hyperacute T-waves (earliest sign) → ST-elevation → Q-waves (indicates necrosis) → T-wave inversion [1]. * **Pathological Q-waves:** Defined as >0.04s wide or >25% of the R-wave height; they signify a completed or old infarction [1]. * **Reciprocal Changes:** ST-depression in leads opposite to the site of infarction (e.g., ST-depression in II, III, aVF during a lateral wall MI) [1].

Q: What is Kussmaul's sign?

Increase in the jugular venous pressure during inspiration. **Explanation:** **Kussmaul’s sign** is a paradoxical rise in the Jugular Venous Pressure (JVP) during inspiration. **Physiological Basis (The "Why"):** Normally, during inspiration, intrathoracic pressure drops, creating a "suction effect" that increases venous return to the right atrium [2], causing the JVP to **fall** [3]. In Kussmaul’s sign, there is an impairment in right ventricular filling (due to restricted expansion or high filling pressures) [2]. When venous return increases during inspiration, the non-compliant right heart cannot accommodate the extra volume, causing the blood to back up into the jugular veins, leading to a visible **rise** in JVP. **Analysis of Options:** * **Option A (Correct):** Accurately describes the paradoxical rise in JVP during inspiration. * **Option B (Incorrect):** This is the **normal physiological response** (JVP falls during inspiration) [3]. * **Option C & D (Incorrect):** These are unrelated to the clinical definition of Kussmaul’s sign, which specifically refers to venous pressure changes during the respiratory cycle. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Cause:** Constrictive Pericarditis. * **Other Causes:** Right Ventricular Infarction (highly specific), Restrictive Cardiomyopathy, Tricuspid Stenosis, and Right-sided Heart Failure [1]. * **Important Distinction:** Kussmaul’s sign is **usually absent** in Cardiac Tamponade (unlike Constrictive Pericarditis), because in tamponade, the heart is compressed by fluid but can still respond to the inspiratory drop in intrathoracic pressure. * **Note:** Do not confuse this with **Kussmaul Breathing** (deep, rapid sighing respirations seen in Diabetic Ketoacidosis).

Q: Acute aortic regurgitation is seen in all of the following conditions except?

Acute myocardial infarction. The key to this question lies in distinguishing between conditions that affect the **aortic root/valves** versus those that affect the **mitral valve apparatus**. **Why Acute Myocardial Infarction (MI) is the correct answer:** Acute MI is a classic cause of acute **Mitral Regurgitation (MR)**, not Aortic Regurgitation [1]. This occurs due to papillary muscle rupture (most commonly the posteromedial papillary muscle in an inferior wall MI) or chordae tendineae dysfunction. It does not anatomically involve the aortic valve or the aortic root. **Analysis of Incorrect Options (Causes of Aortic Regurgitation):** * **Bacterial Endocarditis:** A leading cause of **acute AR** [2]. Vegetations can cause rapid destruction or perforation of the valve leaflets, leading to sudden valvular incompetence. * **Marfan’s Syndrome:** While often associated with chronic dilation, it can lead to **acute AR** via **Aortic Dissection**. A Type A dissection can retrograde into the aortic root, causing sudden malcoaptation of the leaflets. * **Ankylosing Spondylitis:** Typically causes **chronic AR** due to aortitis and thickening of the valve cusps. However, in the context of this "except" question, it is a recognized etiology of aortic root pathology, whereas MI is strictly associated with the mitral valve. **NEET-PG High-Yield Pearls:** 1. **Clinical Sign:** Acute AR is a medical emergency. Unlike chronic AR, you will **not** see a wide pulse pressure or "water hammer" pulse because the left ventricle hasn't had time to compensate/dilate [2]. 2. **Auscultation:** The murmur of acute AR is typically **short and soft** (early diastolic) because of the rapid rise in LV end-diastolic pressure [2]. 3. **Drug of Choice:** Nitroprusside and inotropes are used to stabilize; **Beta-blockers are contraindicated** in acute AR as they block the compensatory tachycardia needed to maintain cardiac output.

Q: What is the most common congenital cardiac anomaly diagnosed in adulthood?

Atrial Septal Defect (ASD). ### Explanation **Correct Option: A. Atrial Septal Defect (ASD)** The primary reason **Atrial Septal Defect (ASD)** is the most common congenital heart disease (CHD) diagnosed in adulthood is its **asymptomatic nature** during childhood [1]. Unlike other defects, the pressure gradient between the left and right atria is relatively low, leading to a gradual left-to-right shunt. This volume overload of the right ventricle is well-tolerated for decades. Most patients remain asymptomatic until their 3rd or 4th decade, when they present with exertional dyspnea, fatigue, or palpitations (often due to atrial fibrillation). Among ASDs, the **Secundum type** is the most common variety [1]. **Why other options are incorrect:** * **Ventricular Septal Defect (VSD):** While VSD is the most common CHD at **birth**, most small VSDs close spontaneously in childhood, and large ones cause early heart failure, leading to diagnosis and surgical repair long before adulthood [2]. * **Patent Ductus Arteriosus (PDA):** These are typically detected in infancy due to the characteristic continuous "machinery" murmur and are usually corrected early to prevent pulmonary hypertension [3]. * **Total Anomalous Pulmonary Venous Return (TAPVR):** This is a cyanotic CHD that usually presents with severe respiratory distress or cyanosis in the neonatal period or early infancy; it is incompatible with long-term survival without early surgical intervention. **High-Yield Clinical Pearls for NEET-PG:** * **Most common CHD at birth:** VSD [2]. * **Most common CHD diagnosed in adults:** ASD [1]. * **Auscultation finding in ASD:** Fixed wide splitting of the second heart sound (S2) and a mid-systolic flow murmur at the pulmonary area. * **ECG in Secundum ASD:** Right axis deviation and RSR' pattern in V1 (Partial RBBB). * **Paradoxical Embolism:** ASD is a significant risk factor for systemic emboli (e.g., stroke) originating from deep vein thrombosis.

Q: ST segment elevation is seen in which of the following conditions?

All of the above. **Explanation:** ST-segment elevation on an ECG represents **transmural myocardial ischemia or injury**, as well as inflammation of the pericardium. While most commonly associated with a Myocardial Infarction (MI), it is a critical finding in several other clinical scenarios. 1. **Acute MI (Option C):** This is the most common cause. It occurs due to a complete coronary artery occlusion, leading to transmural (full-thickness) ischemia. The ST elevation is typically **convex upwards (coved)** and localized to specific vascular territories (e.g., V1-V4 for anterior wall). 2. **Prinzmetal’s Angina (Option A):** Also known as variant angina, this is caused by transient coronary artery vasospasm. Unlike stable angina, it causes transmural ischemia, resulting in **transient ST elevation** that resolves once the spasm subsides or nitroglycerin is administered. 3. **Acute Pericarditis (Option B):** Inflammation of the pericardium affects the underlying epicardium. This leads to **diffuse, concave-upwards ST elevation** across almost all leads (except aVR and V1), often accompanied by **PR-segment depression** (a highly specific sign). Since all three conditions characteristically present with ST-segment elevation, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Concave vs. Convex:** ST elevation in Pericarditis is typically "concave" (smiley face), whereas in MI it is "convex/coved" (sad face/tombstone). * **Reciprocal Changes:** These are seen in Acute MI (ST depression in opposite leads) but are notably **absent** in Pericarditis. * **Other causes of ST Elevation:** Benign Early Repolarization (J-point elevation), Left Ventricular Aneurysm (persistent elevation after MI), and Brugada Syndrome (V1-V2).

Q: Severity of Aortic stenosis is determined by?

ST-T changes. **Explanation:** The severity of **Aortic Stenosis (AS)** is clinically determined by the degree of pressure overload on the Left Ventricle (LV). **Why ST-T changes are the correct answer:** In chronic, severe AS, the LV must generate massive pressures to overcome the narrowed valve. This leads to significant **concentric LV hypertrophy**. As the muscle wall thickens, the subendocardial blood supply becomes insufficient, leading to **secondary repolarization abnormalities**. On an ECG, this manifests as the **"LV strain pattern"** (ST-segment depression and T-wave inversion in lateral leads). The presence of these ST-T changes is a reliable indicator of significant LV pressure overload and is strongly associated with severe stenosis and a higher risk of symptom onset. [1] **Analysis of Incorrect Options:** * **A. Late ejection systolic murmur:** While the *timing* of the peak (late peaking) suggests severity, the *intensity* of the murmur does not. [1] In very severe AS with heart failure (low-flow, low-gradient), the murmur may actually become soft or disappear ("silent AS"). * **C. LV Hypertrophy with displaced apex:** In AS, hypertrophy is **concentric**, meaning the wall thickens inward. Therefore, the apex beat is typically **heaving** but **not displaced** unless the heart begins to fail and dilate (a late, terminal finding). **High-Yield Clinical Pearls for NEET-PG:** 1. **Classic Triad of AS:** Dyspnea (most common), Angina, and Syncope (SAD). 2. **Pulsus Parvus et Tardus:** A small-volume, slow-rising pulse is a hallmark of severe AS. [1] 3. **Gallavardin Phenomenon:** The dissociation between the noisy systolic murmur at the base and musical sounds at the apex. [1] 4. **Gold Standard Investigation:** Transthoracic Echocardiography (Criteria for severe AS: Valve area 40 mmHg, or Jet velocity >4 m/s). [2]

Question 1

What is diagnostic of a fresh myocardial infarction on ECG?

Accepted Answer

ST segment elevation

Answer

QT interval prolongation

Answer

P mitrale

Answer

ST segment depression

Question 2

What is Kussmaul's sign?

Accepted Answer

Increase in the jugular venous pressure during inspiration

Answer

Decrease in the jugular venous pressure during inspiration

Answer

Change in the blood pressure during exercise

Answer

Epigastric pulsation during running

Question 3

Positive hepatojugular reflux is found in which of the following conditions?

Accepted Answer

Tricuspid regurgitation

Answer

Left heart failure

Answer

Decreased afterload

Answer

Decreased capillary bed pressure

Question 4

Acute aortic regurgitation is seen in all of the following conditions except?

Accepted Answer

Acute myocardial infarction

Answer

Marfan's syndrome

Answer

Bacterial endocarditis

Answer

Ankylosing spondylitis

Question 5

All statements are true regarding non-ST elevation acute coronary syndromes (NSTE-ACS) and ST elevation myocardial infarctions (STEMI) except?

Accepted Answer

Infarction of >=60% of the left ventricle usually results in cardiogenic shock.

Answer

The relative incidence of NSTEMI is rising due to the increasing burden of diabetes and chronic kidney disease in an aging population.

Answer

Pump failure is now the primary cause of in-hospital death from STEMI.

Answer

Percutaneous coronary intervention (PCI) is the treatment of choice for patients with acute coronary syndromes.

Question 6

A 27-year-old woman presents with cough, shortness of breath, and palpitations. Her childhood history includes recurrent "pneumonia." She denies sputum production. On examination, she appears anxious, with distended neck veins, a widened split second heart sound with minimal respiratory variation, and a systolic ejection murmur in the pulmonic area. Lung examination reveals bilateral crackles, mild ascites, and pedal edema. EKG shows right axis deviation. What is the next diagnostic step?

Accepted Answer

Echocardiogram

Answer

CT scan of the chest

Answer

Immunoglobulin levels

Answer

PPD testing

Question 7

What is the most common congenital cardiac anomaly diagnosed in adulthood?

Accepted Answer

Atrial Septal Defect (ASD)

Answer

Ventricular Septal Defect (VSD)

Answer

Patent Ductus Arteriosus (PDA)

Answer

Total Anomalous Pulmonary Venous Return (TAPVR)

Question 8

ST segment elevation is seen in which of the following conditions?

Accepted Answer

All of the above

Answer

Prinzmetal's angina

Answer

Acute pericarditis

Answer

Acute MI

Question 9

Severity of Aortic stenosis is determined by?

Accepted Answer

ST-T changes

Answer

Late ejection systolic murmur

Answer

LV Hypertrophy with displaced apex

Answer

None

Question 10

Spurious hypertension (false elevation of blood pressure readings) is most commonly associated with which of the following findings?

Accepted Answer

Auscultatory gap

Answer

Thick, calcified arteries

Answer

Use of a small blood pressure cuff

Answer

Obesity

Cardiology — MCQs

Cardiology — MCQs

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