Cardiology Practice Questions

Q: Which biomarker rises earliest in myocardial infarction?

Myoglobin. ### Explanation **Correct Option: C (Myoglobin)** Myoglobin is a low-molecular-weight heme protein found in cardiac and skeletal muscle. Due to its small size and lack of structural binding within the cell, it is released rapidly into the bloodstream following membrane damage. It is the **earliest biomarker** to rise, appearing within **1–3 hours** of the onset of myocardial infarction (MI). While highly sensitive for early detection, it lacks specificity because it also rises in skeletal muscle injury. **Analysis of Incorrect Options:** * **A & D (Troponin I and T):** Cardiac Troponins are the "Gold Standard" for diagnosing MI due to their high specificity [2]. However, they typically begin to rise **3–6 hours** after the onset of chest pain, peaking at 12–24 hours. They remain elevated for 7–10 days (Troponin I) or up to 14 days (Troponin T). * **B (CK-MB):** This isoenzyme begins to rise **4–8 hours** after injury and returns to baseline within 48–72 hours [1]. Its primary clinical utility in modern practice is the detection of **re-infarction**, as Troponins stay elevated for too long to identify a new event. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Marker:** Myoglobin (1–3 hours). * **Most Specific Marker:** Troponin I (more specific than Troponin T in patients with renal failure). * **Marker for Re-infarction:** CK-MB (due to its short half-life). * **Marker for Late Diagnosis:** Troponin T (stays elevated for up to 2 weeks). * **LDH Flip:** In the past, LDH1 > LDH2 was used for late diagnosis (after 24 hours), but this is now obsolete in clinical practice [1].

Q: Which of the following is not a modifiable risk factor for atherosclerosis?

Obesity. In the context of NEET-PG and standard cardiovascular guidelines (like the Framingham Risk Score), risk factors for atherosclerosis are categorized into **Non-modifiable** (Age, Male sex, Family history, Genetic abnormalities) and **Modifiable** (Dyslipidemia, Hypertension, Smoking, Diabetes). [1] **Why Obesity is the correct answer here:** While it seems counterintuitive, in many classic medical examinations, **Obesity** is considered an *indirect* or *contributing* factor rather than a primary independent modifiable risk factor. The major modifiable drivers of atherosclerosis are those that directly damage the endothelium or alter lipid metabolism. Obesity exerts its risk primarily by mediating other conditions like Hypertension, Dyslipidemia, and Type 2 Diabetes. Therefore, in a "choose the best option" scenario among these four, obesity is often singled out as the outlier. **Analysis of Incorrect Options:** * **A. Physical Inactivity:** A major modifiable risk factor. Regular exercise improves endothelial function and insulin sensitivity. * **C. Diabetes Mellitus:** A "coronary artery disease equivalent." Hyperglycemia leads to the formation of Advanced Glycation End-products (AGEs), which accelerate atherosclerosis. * **D. Hypertension:** The most common cause of left ventricular hypertrophy and a direct cause of mechanical endothelial injury, promoting plaque formation. [1] **High-Yield Clinical Pearls for NEET-PG:** * **Most important risk factor for Atherosclerosis:** Hyperlipidemia (specifically high LDL). * **Strongest risk factor for Stroke:** Hypertension. * **Strongest risk factor for Peripheral Arterial Disease (PAD) and Buerger's Disease:** Smoking. * **Hyperhomocysteinemia:** An emerging modifiable risk factor (treatable with Vitamin B12/Folate). * **CRP:** A marker of systemic inflammation used to assess "residual inflammatory risk" in atherosclerosis.

Q: All of the following statements about Brugada syndrome are true, EXCEPT:

Flecainide can be used for treatment.. Brugada Syndrome is an autosomal dominant genetic channelopathy, most commonly involving a mutation in the **SCN5A gene** (sodium channel). It is a leading cause of sudden cardiac death in young individuals with structurally normal hearts. **Why Option D is the Correct Answer (The Exception):** Flecainide is a Class IC antiarrhythmic that blocks sodium channels. In Brugada syndrome, sodium channel blockers **unmask or worsen** the characteristic ECG pattern and can actually **precipitate** fatal arrhythmias. Therefore, Flecainide is used as a *provocative diagnostic test* (the Flecainide challenge) to reveal the Brugada pattern, but it is strictly **contraindicated for treatment**. The only proven effective treatment for preventing sudden death in high-risk patients is an **Implantable Cardioverter Defibrillator (ICD)**. **Analysis of Other Options:** * **Option A:** The hallmark of Brugada is a pseudo-right bundle branch block and **ST-segment elevation in leads V1-V3**. This pattern can be transient and may be triggered by fever or certain drugs. * **Option B:** It is the primary cause of **Sudden Unexpected Nocturnal Death Syndrome (SUNDS)**, particularly prevalent in young Southeast Asian males. * **Option C:** There is a significantly high risk of **polymorphic ventricular tachycardia** and ventricular fibrillation, which often occurs during sleep or rest. **High-Yield Clinical Pearls for NEET-PG:** * **ECG Patterns:** Type 1 (Coved-type ST elevation ≥2mm) is the only diagnostic pattern. * **Inheritance:** Autosomal Dominant; SCN5A gene mutation (loss of function). * **Triggers:** Fever is a major trigger for arrhythmias; aggressive antipyretic therapy is essential. * **Pharmacotherapy:** While ICD is the gold standard, **Quinidine** (Class IA) can be used as an adjunct to reduce arrhythmia frequency because it also blocks Ito channels.

Q: Kussmaul's sign is not seen in which of the following conditions?

Cardiac tamponade. **Explanation:** **Kussmaul’s sign** is the paradoxical rise in Jugular Venous Pressure (JVP) during inspiration. Normally, JVP falls during inspiration due to negative intrathoracic pressure increasing venous return to the right heart. **Why Cardiac Tamponade is the Correct Answer:** In **Cardiac Tamponade**, Kussmaul’s sign is characteristically **absent** [1]. Although the heart is compressed by fluid, the intrapericardial pressure is transmitted equally to all chambers. During inspiration, the negative intrathoracic pressure still allows the heart to expand slightly within the fluid-filled sac, accommodating the increased venous return. Therefore, JVP falls normally. **Analysis of Incorrect Options:** * **Constrictive Pericarditis:** This is the classic cause [2]. A rigid, calcified pericardium prevents the right ventricle from expanding to accommodate inspiratory venous return, forcing the blood back into the jugular veins. * **Restrictive Cardiomyopathy:** Similar to constriction, the non-compliant (stiff) myocardium limits diastolic filling, leading to a rise in JVP during inspiration. * **RV Infarct:** A dysfunctional, "stunned" right ventricle cannot handle the increased preload during inspiration, resulting in venous backup. **NEET-PG High-Yield Pearls:** 1. **The Exception Rule:** Kussmaul’s sign is seen in almost all conditions with impaired right heart filling **EXCEPT** Cardiac Tamponade. 2. **JVP Waveforms:** In Constrictive Pericarditis, you see a prominent **'y' descent** (Friedreich's sign). In Cardiac Tamponade, the **'y' descent is absent or blunted**. 3. **Beck’s Triad (Tamponade):** Hypotension, JVD, and muffled heart sounds. 4. **Pulsus Paradoxus:** Present in Tamponade, but usually absent in Constrictive Pericarditis (unless a co-existing effusion exists).

Q: Pulsus parvus et tardus is observed in which condition?

Severe Aortic Stenosis. **Explanation:** **Pulsus parvus et tardus** (also known as the "anacrotic pulse") is the hallmark arterial pulse finding in **Severe Aortic Stenosis**. [3] 1. **Mechanism of the Correct Answer:** In Aortic Stenosis (AS), the calcified or narrowed aortic valve creates a fixed obstruction to left ventricular outflow. [1] * **Parvus (Small):** The stroke volume is reduced, leading to a small pulse pressure (low amplitude). * **Tardus (Late/Slow):** The obstruction causes a prolonged ejection time, meaning the arterial pressure rises slowly and the peak is delayed. [3] This is best palpated at the carotid arteries. 2. **Analysis of Incorrect Options:** * **Severe Mitral Stenosis:** Typically presents with a **low-volume pulse** (pulsus parvus) due to reduced preload, but the upstroke is not delayed (not tardus). * **Severe Aortic Regurgitation:** Characterized by a **Water-hammer pulse** (Corrigan’s pulse/Collapsing pulse). [4] This is a "large and fast" pulse (pulsus magnus et celer) due to a wide pulse pressure. [4] * **Severe Mitral Regurgitation:** Usually results in a normal or slightly low-volume pulse. If severe, it may be brisk but is not associated with a delayed upstroke. [2] **High-Yield Clinical Pearls for NEET-PG:** * **Pulsus Alternans:** Pathognomonic for severe Left Ventricular Failure (LVF). * **Pulsus Bisferiens:** Seen in AR + AS (mixed) or HOCM. * **Pulsus Paradoxus:** Defined as a drop in systolic BP >10 mmHg during inspiration; seen in Cardiac Tamponade, Severe Asthma, and COPD. * **Gallavardin Phenomenon:** In AS, the harsh systolic murmur may be heard as a high-pitched musical sound at the apex, mimicking MR. [3]

Q: Use of Phosphodiesterase Inhibitors for erectile dysfunction is contraindicated in which of the following conditions?

Unstable/symptomatic angina. The correct answer is **Unstable/symptomatic angina**. Phosphodiesterase-5 (PDE-5) inhibitors (e.g., Sildenafil, Tadalafil) cause systemic vasodilation by increasing cGMP levels. In patients with unstable angina, this can lead to a significant drop in blood pressure and a reflex increase in heart rate, potentially worsening myocardial ischemia or precipitating a myocardial infarction (MI) [2]. Furthermore, these patients may require sublingual Nitroglycerin; the co-administration of nitrates and PDE-5 inhibitors is strictly contraindicated as it can cause life-threatening refractory hypotension. **Analysis of Incorrect Options:** * **A. Pulmonary arterial hypertension (PAH):** PDE-5 inhibitors are actually a standard treatment for PAH (e.g., Sildenafil/Revatio) because they promote pulmonary vasodilation and reduce pulmonary vascular resistance. * **C. Previous MI > 6 weeks ago:** Patients with a history of MI can safely use PDE-5 inhibitors provided they are currently stable, asymptomatic, and not on nitrate therapy. The high-risk period is generally considered the first 2–6 weeks post-event. * **D. Congestive heart failure (NYHA Class-I):** Patients with mild, stable heart failure (Class I) can generally tolerate these drugs [1]. Contraindications usually apply to severe (Class IV) or unstable heart failure. **High-Yield Clinical Pearls for NEET-PG:** * **The Nitrate Rule:** Avoid PDE-5 inhibitors for 24 hours after Sildenafil/Vardenafil and 48 hours after Tadalafil (due to its longer half-life) if nitrates are needed. * **Other Contraindications:** Recent stroke/MI (within 6 months), resting hypotension (<90/50 mmHg), and hereditary retinal degenerative disorders (e.g., Retinitis Pigmentosa). * **Side Effect:** "Blue-tinted vision" (Cyanopsia) due to cross-inhibition of PDE-6 in the retina.

Question 1

Which biomarker rises earliest in myocardial infarction?

Accepted Answer

Myoglobin

Answer

Troponin-I

Answer

Creatine kinase-MB

Answer

Troponin-T

Question 2

Which of the following is not a modifiable risk factor for atherosclerosis?

Accepted Answer

Obesity

Answer

Physical inactivity

Answer

Diabetes

Answer

Hypertension

Question 3

All of the following statements about Brugada syndrome are true, EXCEPT:

Accepted Answer

Flecainide can be used for treatment.

Answer

Transient ST segment elevation in leads V1-V3 is seen.

Answer

It is responsible for the sudden and unexpected nocturnal death syndrome.

Answer

The risk of fatal ventricular arrhythmia is high.

Question 4

All of the following electrocardiographic findings may represent manifestations of digitalis intoxication, EXCEPT?

Accepted Answer

Atrial flutter

Answer

Bigeminy

Answer

Junctional tachycardia

Answer

Atrial tachycardia with variable block

Question 5

Kussmaul's sign is not seen in which of the following conditions?

Accepted Answer

Cardiac tamponade

Answer

Restrictive cardiomyopathy

Answer

Constrictive pericarditis

Answer

RV infarct

Question 6

Pulsus parvus et tardus is observed in which condition?

Accepted Answer

Severe Aortic Stenosis

Answer

Severe Mitral Stenosis

Answer

Severe Aortic Regurgitation

Answer

Severe Mitral Regurgitation

Question 7

Use of Phosphodiesterase Inhibitors for erectile dysfunction is contraindicated in which of the following conditions?

Accepted Answer

Unstable/symptomatic angina

Answer

Pulmonary arterial hypertension

Answer

Previous myocardial infarction > 6 weeks ago

Answer

Congestive heart failure (NYHA Class-I)

Question 8

What is the most common cause of left-sided heart failure?

Accepted Answer

Myocardial infarction

Answer

Systemic hypertension

Answer

Rheumatic heart disease

Answer

Infective endocarditis

Question 9

Which of the following statement is incorrect about hypertrophic cardiomyopathy?

Accepted Answer

Adapted mitral valve results in anteriorly directed mitral regurgitation.

Answer

Interventricular septum shows maximum hypertrophy.

Answer

30% of cases show obstruction at rest.

Answer

Systolic dysfunction arises due to mitral valve displacement.

Question 10

Which of the following statements regarding atrioventricular block with atrial tachycardia is true?

Accepted Answer

Seen in digitalis toxicity with potassium depletion

Answer

Seen in Wolff-Parkinson-White syndrome

Answer

Is a complication of pacemaker therapy

Answer

Can occur in a normal individual occasionally

Cardiology — MCQs

Cardiology — MCQs

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