Cardiology Practice Questions

Q: A patient complains of intermittent claudication, dizziness, and headache. What is the likely cardiac lesion?

Tetralogy of Fallot (TOF). ### Explanation The clinical presentation of **intermittent claudication, dizziness, and headache** in a patient with a congenital heart lesion points toward a state of **chronic hypoxia and secondary polycythemia**, which is a hallmark of **Tetralogy of Fallot (TOF)** [1]. **1. Why TOF is the Correct Answer:** TOF is the most common cyanotic congenital heart disease [1]. The right-to-left shunt leads to chronic hypoxemia. To compensate, the body increases erythropoietin production, leading to **secondary polycythemia** (elevated hematocrit). This increased blood viscosity causes: * **Hyperviscosity Syndrome:** Leading to headaches and dizziness. * **Reduced Peripheral Perfusion:** During exercise, the viscous blood and low oxygen delivery result in muscle ischemia, manifesting as **intermittent claudication**. **2. Why Other Options are Incorrect:** * **Atrial Septal Defect (ASD) & Patent Ductus Arteriosus (PDA):** These are primarily left-to-right (acyanotic) shunts [3], [4]. Unless Eisenmenger syndrome develops, they do not typically present with polycythemia-related claudication or hyperviscosity symptoms. * **Coarctation of the Aorta:** While this classically causes claudication (due to mechanical obstruction) and headaches (due to upper limb hypertension), it is an **acyanotic** lesion [2]. In the context of standard NEET-PG patterns, if the question implies a "cardiac lesion" associated with systemic cyanotic complications, TOF is the preferred answer. **3. NEET-PG High-Yield Pearls:** * **TOF Components:** VSD, Overriding of Aorta, Pulmonary Stenosis, and RV Hypertrophy [1]. * **X-ray Finding:** "Boot-shaped heart" (Coeur en sabot). * **Management of "Tet Spells":** Knee-chest position (increases systemic vascular resistance) and Morphine. * **Polycythemia Risk:** Patients are at high risk for **cerebral thrombosis** and **brain abscesses** due to the loss of pulmonary capillary filtering [2].

Q: A 55-year-old woman presents with recent onset of chest pain and dyspnea. Six weeks prior, the patient suffered a myocardial infarction. On physical examination, a friction rub is heard over the 5th intercostal space in the midclavicular line, along with elevated JVP. What is the most likely cause of this presentation?

Dressler syndrome. ### Explanation **Dressler Syndrome (Post-Myocardial Infarction Syndrome)** The correct answer is **Dressler syndrome**. This is an immune-mediated (Type III hypersensitivity) pericarditis that typically occurs **2 to 10 weeks** after a myocardial infarction (MI). The clinical triad includes fever, pleuritic chest pain, and a pericardial friction rub. The presence of elevated JVP and a friction rub 6 weeks post-MI strongly points toward this delayed inflammatory response. **Analysis of Incorrect Options:** * **Cardiac Rupture Syndrome:** This is a catastrophic early complication, usually occurring within the **first 3–7 days** post-MI. It presents with sudden cardiac tamponade and electromechanical dissociation, not a subacute presentation at 6 weeks. * **Thromboembolism:** While common post-MI due to mural thrombi, it typically presents with focal neurological deficits (stroke) or acute limb ischemia, rather than a pericardial friction rub and JVP elevation. * **Ventricular Aneurysm:** This late complication (weeks to months) usually presents with heart failure, persistent ST-segment elevation on ECG, or ventricular arrhythmias. While it can cause elevated JVP due to heart failure, it does not typically cause a friction rub unless associated with Dressler syndrome. **NEET-PG High-Yield Pearls:** * **Timeline is Key:** * *Fibrinous Pericarditis:* 1–3 days post-MI (localized inflammation). * *Dressler Syndrome:* 2–10 weeks post-MI (autoimmune). * **Pathophysiology:** Formation of antibodies against myocardial antigens released during necrosis. * **Treatment:** High-dose Aspirin or NSAIDs; Colchicine is often added [1]. Corticosteroids are reserved for refractory cases [1]. * **Classic Sign:** Pericardial friction rub is best heard with the patient leaning forward during expiration.

Q: Severe chronic mitral regurgitation is associated with which of the following?

Left ventricular hypertrophy. In chronic mitral regurgitation (MR), the left ventricle (LV) faces a unique hemodynamic challenge: it must handle both the normal stroke volume and the regurgitant volume leaked back into the left atrium [1]. This leads to **chronic volume overload**. **Why Left Ventricular Hypertrophy (LVH) is the correct answer:** To accommodate this increased volume while maintaining cardiac output, the LV undergoes **eccentric hypertrophy**. According to Laplace’s Law, as the radius of the ventricle increases (dilation), wall stress increases. To normalize this stress, the ventricular wall thickens. In the context of NEET-PG, while MR causes dilation, the compensatory structural hallmark that defines the "severe chronic" stage to maintain stroke volume is eccentric LVH [1]. **Analysis of Incorrect Options:** * **B. Left Ventricular Dilation:** While dilation occurs alongside hypertrophy (eccentric hypertrophy), the question specifically tests the compensatory structural change [1]. In many standardized exams, "hypertrophy" is considered the primary compensatory mechanism for chronic overload. * **C. Left Atrial Enlargement:** This occurs due to the regurgitant volume, but it is a secondary consequence rather than the primary ventricular adaptation that dictates the clinical course and surgical timing [1]. * **D. Atrial Fibrillation:** This is a common *complication* of chronic MR due to atrial stretch, but it is not a structural association of the disease itself [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Murmur:** Pansystolic murmur radiating to the axilla; intensity does *not* increase with inspiration (unlike tricuspid regurgitation). * **S3 Gallop:** Its presence in chronic MR indicates severe volume overload and LV dysfunction. * **Surgical Timing:** Surgery is indicated even in asymptomatic patients if the LV Ejection Fraction (LVEF) drops below 60% or the LV End-Systolic Dimension (LVESD) exceeds 40 mm [1].

Q: S4 is seen in all of the following, except:

Atrial fibrillation. ### Explanation The **Fourth Heart Sound (S4)**, also known as the atrial gallop, occurs during late diastole. It is produced by the forceful contraction of the atria pushing blood into a stiff, non-compliant left ventricle. **Why Atrial Fibrillation (AF) is the correct answer:** The fundamental requirement for an S4 is a functional, coordinated atrial contraction. In **Atrial Fibrillation**, the atria do not contract effectively [1]; instead, they quiver (fibrillate). Without an "atrial kick," the S4 sound cannot be generated. Therefore, S4 is characteristically absent in AF. **Analysis of Incorrect Options:** * **Acute MI:** Myocardial ischemia leads to decreased ventricular compliance (stiffness) [3]. The atria must contract harder to fill the stiff ventricle, making S4 a common finding in acute myocardial infarction. * **Hypertrophic Cardiomyopathy (HCM):** This condition is characterized by significant ventricular hypertrophy and impaired relaxation. The resulting stiffness leads to a prominent S4. * **Thyrotoxicosis:** This is a hyperdynamic state. Increased sympathetic activity leads to forceful atrial contractions and increased ventricular filling pressures, which can produce an S4. **High-Yield Clinical Pearls for NEET-PG:** * **S4 Timing:** Occurs just before S1 (presystolic). * **Mechanism:** Always pathological (unlike S3, which can be physiological in young adults/pregnancy). It indicates **diastolic heart failure** or ventricular hypertrophy [2]. * **The "Lubb-dupp-ah" Mnemonic:** S4-S1-S2 sounds like "Tennessee." * **Clinical Association:** S4 is most commonly associated with **Systemic Hypertension**, Aortic Stenosis, and Ischemic Heart Disease [3]. * **Rule of Thumb:** If the patient is in AF, you can never hear an S4.

Q: Several older patients in your practice intend to pursue exercise programs. They have no cardiac symptoms but do have vascular risk factors such as diabetes or hypertension. In these patients, which of the following is true about exercise electrocardiography?

It detects latent disease.. **Explanation:** The primary goal of exercise electrocardiography (Stress Testing) in asymptomatic patients with multiple risk factors (like diabetes or hypertension) is to unmask **latent coronary artery disease (CAD)** [1]. While these patients may not have symptoms at rest, the increased myocardial oxygen demand during exercise can induce ischemia, which is then detected via ST-segment changes on the ECG [1]. **Analysis of Options:** * **Option C (Correct):** Exercise stress testing is a screening tool used to identify "silent" or latent ischemia in individuals who are currently asymptomatic but are at high risk due to comorbidities [1]. * **Option A:** It is a **non-invasive** procedure. It involves monitoring the heart's electrical activity while the patient walks on a treadmill or uses a stationary bike. * **Option B:** It is **not contraindicated** in patients over 65. In fact, older adults starting a vigorous exercise program often require screening. Contraindications are based on clinical stability (e.g., acute MI, unstable angina, severe aortic stenosis), not age. * **Option D:** The procedure is very safe. The morbidity/mortality rate is extremely low (approximately **0.01% to 0.05%**), far below the 5% suggested. **Clinical Pearls for NEET-PG:** * **Target Heart Rate:** To be diagnostic, a patient must reach at least **85% of their age-predicted maximum heart rate** (220 - age). * **Positive Test:** Defined as **≥1 mm horizontal or downsloping ST-segment depression** measured 0.08 seconds after the J-point [1]. * **Gold Standard:** While exercise ECG is a common first-line screen, Coronary Angiography remains the gold standard for diagnosing CAD. * **Duke Treadmill Score:** Used to prognosticate outcomes based on exercise time, ST-deviation, and angina index.

Question 1

A 48-year-old woman presents with suspected myocardial ischemia. Pharmacologic stress myocardial perfusion SPECT with Tc-99m sestamibi shows reversible perfusion defect in the inferior wall. Evaluate the optimal management approach based on this functional imaging finding.

Accepted Answer

Recommend coronary angiography for further evaluation and potential revascularization

Answer

Reassure patient as findings represent artifact

Answer

Start medical management without further investigation

Answer

Proceed directly to coronary artery bypass grafting

Question 2

A patient complains of intermittent claudication, dizziness, and headache. What is the likely cardiac lesion?

Accepted Answer

Tetralogy of Fallot (TOF)

Answer

Atrial Septal Defect (ASD)

Answer

Patent Ductus Arteriosus (PDA)

Answer

Coarctation of the Aorta

Question 3

A 67-year-old man with an 18-year history of type 2 diabetes mellitus presents for a routine physical examination. His temperature is 36.9 C (98.5 F), his blood pressure is 158/98 mm Hg and his pulse is 82/minute and regular. On examination, the physician notes a non-tender, pulsatile, mass in the mid-abdomen. A plain abdominal x-ray film with the patient in the lateral position reveals spotty calcification of a markedly dilated abdominal aortic wall. Which of the following physiologic observations helps to account for the fact that 75% of the aneurysms of this patient's type are found in the abdomen and only 25% principally involve the thorax?

Accepted Answer

The average blood pressure in the abdominal aorta is higher than that in the thoracic aorta.

Answer

Diastolic pressure is greater in the abdominal aorta in the supine position.

Answer

Negative intrathoracic pressure reduces aortic wall tension in the thorax.

Answer

The average blood flow in the abdominal aorta is greater than that in the thoracic aorta.

Question 4

A 55-year-old woman presents with recent onset of chest pain and dyspnea. Six weeks prior, the patient suffered a myocardial infarction. On physical examination, a friction rub is heard over the 5th intercostal space in the midclavicular line, along with elevated JVP. What is the most likely cause of this presentation?

Accepted Answer

Dressler syndrome

Answer

Cardiac rupture syndrome

Answer

Thromboembolism

Answer

Ventricular aneurysm

Question 5

A 70-year-old patient with a history of exertional chest pain for the last 4 years, which has not progressed, refuses angiography. What is the recommended management for this patient?

Accepted Answer

Administer low-dose aspirin.

Answer

Prescribe sublingual nitroglycerin before exertion.

Answer

Advise to continue exercise even after experiencing chest pain.

Answer

Advise to stop exercising if chest pain occurs.

Question 6

The severity of mitral regurgitation is decided by all of the following clinical findings except?

Accepted Answer

Intensity of the systolic murmur across the mitral valve

Answer

Presence of mid-diastolic murmur across the mitral valve

Answer

Wide split second heart sound

Answer

Presence of left ventricular S3 gallop

Question 7

Severe chronic mitral regurgitation is associated with which of the following?

Accepted Answer

Left ventricular hypertrophy

Answer

Left ventricular dilation

Answer

Left atrial enlargement

Answer

Atrial fibrillation

Question 8

A patient presents with dyspnea, elevated JVP, and pedal edema. Physical examination reveals clear lungs, a parasternal heave, and a palpable S2 in the pulmonary area. Which one of the following investigations is LEAST helpful in determining the etiology of this patient's condition?

Accepted Answer

Anti-endomysial antibody estimation

Answer

Echocardiography for mitral stenosis

Answer

ELISA for HIV

Answer

Urine/stool examination for Schistosoma ova

Question 9

S4 is seen in all of the following, except:

Accepted Answer

Atrial fibrillation

Answer

Thyrotoxicosis

Answer

Acute MI

Answer

Hypertrophic cardiomyopathy

Question 10

Several older patients in your practice intend to pursue exercise programs. They have no cardiac symptoms but do have vascular risk factors such as diabetes or hypertension. In these patients, which of the following is true about exercise electrocardiography?

Accepted Answer

It detects latent disease.

Answer

It is an invasive procedure.

Answer

It is contraindicated in patients over 65 years of age.

Answer

It has a morbidity of approximately 5%.

Cardiology — MCQs

Cardiology — MCQs

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