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: Which of the following is a risk factor for coronary artery disease (CAD)?

Increased homocysteine levels. **Explanation:** Coronary Artery Disease (CAD) is driven by atherosclerosis, a process influenced by traditional and non-traditional risk factors [1]. **Why Option C is Correct:** **Increased homocysteine levels (Hyperhomocysteinemia)** is a recognized non-traditional risk factor for CAD. Elevated homocysteine promotes atherosclerosis through several mechanisms: it induces vascular endothelial injury, promotes the oxidation of LDL cholesterol, and stimulates smooth muscle cell proliferation. Furthermore, it creates a pro-thrombotic state by increasing platelet aggregation and interfering with the coagulation cascade. **Analysis of Incorrect Options:** * **Option A (High HDL):** High-Density Lipoprotein (HDL) is known as "good cholesterol." It facilitates reverse cholesterol transport (carrying cholesterol away from arteries to the liver) [3] and has antioxidant properties [4], making it **cardioprotective**, not a risk factor. * **Option B (Low LDL):** Low-Density Lipoprotein (LDL) is the primary atherogenic lipoprotein [2]. **High** levels of LDL are a major risk factor; conversely, low levels are associated with a reduced risk of plaque formation. * **Option D (Decreased fibrinogen levels):** Fibrinogen is a coagulation factor. **Increased** levels of fibrinogen (a pro-inflammatory and pro-coagulant marker) are associated with an increased risk of CAD and thrombosis. **Clinical Pearls for NEET-PG:** * **Homocysteine Metabolism:** Deficiencies in **Vitamin B12, B6, and Folic acid** can lead to hyperhomocysteinemia. * **Emerging Risk Factors:** Other high-yield non-traditional markers include **Lipoprotein(a)**, **High-sensitivity C-reactive protein (hs-CRP)**, and **Small dense LDL particles** [2]. * **Framingham Risk Score:** Remember that age, male gender, hypertension, smoking, and diabetes remain the "Big 5" traditional risk factors.

Q: What is the most common cause of painful pericarditis?

Viral. **Explanation:** Acute pericarditis is characterized by the classic triad of chest pain, a pericardial friction rub, and diffuse ST-segment elevation on ECG [1]. **1. Why Viral is Correct:** Viral infections (most commonly **Coxsackievirus B** and Echovirus) are the most frequent cause of acute pericarditis in clinical practice [1]. The pain in viral pericarditis is typically sharp, pleuritic, and retrosternal, caused by the inflammation of the parietal pericardium and adjacent pleura. Because viral pericarditis involves an intense inflammatory response, it is the most common cause of **painful** pericarditis. **2. Why the other options are incorrect:** * **Tuberculous Pericarditis:** While common in developing countries like India, it usually presents as a chronic, subacute condition [2]. It often leads to pericardial effusion or constrictive pericarditis rather than acute, sharp pain [2]. * **Uremic Pericarditis:** This is a classic "high-yield" exception. Uremic pericarditis (seen in end-stage renal disease) is typically **painless** because it is a metabolic/fibrinous process rather than a purely inflammatory one. The lack of pain is due to the absence of significant inflammation of the surrounding pleura. * **All of these:** Incorrect because of the distinct clinical presentation of uremic pericarditis as painless. **Clinical Pearls for NEET-PG:** * **Positionality:** Pericarditic pain characteristically worsens when supine and is **relieved by sitting up and leaning forward**. * **ECG Findings:** Look for diffuse concave-upwards ST elevation and **PR segment depression** (the latter is highly specific for acute pericarditis) [1]. * **Treatment:** First-line treatment is NSAIDs (like Ibuprofen or Aspirin) plus **Colchicine** (to prevent recurrence) [1]. * **Dressler Syndrome:** An autoimmune form of pericarditis occurring 2–10 weeks post-Myocardial Infarction.

Question 1

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 2

Dissection of which artery is seen in pregnancy?

Accepted Answer

Aorta

Answer

Carotid artery

Answer

Coronary artery

Answer

Femoral artery

Question 3

Which of the following is a risk factor for coronary artery disease (CAD)?

Accepted Answer

Increased homocysteine levels

Answer

High HDL

Answer

Low LDL

Answer

Decreased fibrinogen levels

Question 4

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 5

What is the most common cause of painful pericarditis?

Accepted Answer

Viral

Answer

Tuberculous

Answer

Uremic

Answer

All of these

Cardiology — MCQs

Cardiology — MCQs

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