Cardiology Practice Questions

Q: Which of the following is the most common complication of heart failure?

Hydrothorax. **Explanation:** **Heart Failure and Hydrothorax** In patients with congestive heart failure (CHF), the primary hemodynamic abnormality is an increase in pulmonary capillary wedge pressure and systemic venous pressure. This elevation in hydrostatic pressure leads to the transudation of fluid from the capillaries into the interstitial space and subsequently into the pleural cavity [1]. This collection of serous fluid is termed **Hydrothorax** (a type of pleural effusion). In CHF, hydrothorax is typically **bilateral**. However, if it is unilateral, it occurs more frequently on the **right side** due to the larger surface area of the right lung and the specific lymphatic drainage patterns. **Analysis of Incorrect Options:** * **B. Pneumothorax:** This refers to air in the pleural space. While it can occur due to trauma or ruptured blebs, it is not a direct physiological consequence of heart failure. * **C. Pyothorax (Empyema):** This is the accumulation of pus in the pleural cavity, usually resulting from an underlying pneumonia or infection. Heart failure causes transudative effusions, not exudative/infectious ones. * **D. Hemothorax:** This is the presence of blood in the pleural space, typically caused by thoracic trauma, malignancy, or aortic rupture. **High-Yield Clinical Pearls for NEET-PG:** * **Light’s Criteria:** Effusions in heart failure are **transudates** (Protein ratio 1.2 g/dL suggests CHF). * **Unilateral Hydrothorax:** If present in CHF, it is most commonly right-sided. If it is isolated to the left side, other etiologies (like aortic dissection or malignancy) should be ruled out.

Q: What is the cause of essential (Primary) Hypertension?

Excessive sympathetic nervous system activity. ### Explanation **Correct Option: A. Excessive sympathetic nervous system activity** Essential (Primary) hypertension accounts for approximately 90-95% of all hypertensive cases [2]. By definition, it is hypertension with no single identifiable cause; however, it is considered a **polygenic and multifactorial disorder** [1]. The underlying pathophysiology involves a complex interplay between genetics and environmental factors. **Excessive sympathetic nervous system (SNS) activity** is a primary driver [2]. Increased SNS tone leads to: 1. **Increased Cardiac Output:** Via increased heart rate and myocardial contractility. 2. **Increased Peripheral Resistance:** Via vasoconstriction of arterioles. 3. **Renal Effects:** Stimulation of the Renin-Angiotensin-Aldosterone System (RAAS), leading to sodium and water retention. **Why other options are incorrect:** * **B, C, and D (Renal artery stenosis, Glomerulonephritis, Chronic renal failure):** These are all causes of **Secondary Hypertension** [1]. In these cases, the elevation in blood pressure is a direct consequence of an identifiable underlying pathology (Renovascular or Renal Parenchymal disease). Renal parenchymal disease is the most common cause of secondary hypertension. --- ### NEET-PG High-Yield Pearls * **Definition:** Essential hypertension is diagnosed when BP is ≥140/90 mmHg on two or more occasions without an underlying secondary cause. * **Genetic Link:** Liddle’s Syndrome is a rare monogenic cause of hypertension involving the ENaC channel (mimics hyperaldosteronism). * **Metabolic Syndrome:** Essential hypertension is frequently associated with hyperinsulinemia and insulin resistance, which further increases SNS activity. * **Dietary Factors:** High sodium intake (>3g/day) and low potassium intake are significant contributors to the development of primary hypertension [1].

Q: What is a main disadvantage of stenting?

Late stent thrombosis. **Explanation:** The primary disadvantage and most dreaded complication of coronary stenting, particularly with Drug-Eluting Stents (DES), is **Late Stent Thrombosis (LST)**. [1] **1. Why Late Stent Thrombosis is the correct answer:** While stents were designed to solve the mechanical issues of balloon angioplasty, they introduced a new risk: thrombosis. [1] DES release antiproliferative drugs (like Sirolimus or Paclitaxel) to prevent neointimal hyperplasia. However, these drugs also **delay re-endothelialization** of the stent struts. This prolonged exposure of the metallic struts to blood flow creates a pro-thrombotic environment [2], leading to "Late" (>30 days) or "Very Late" (>1 year) stent thrombosis, which often presents as sudden death or major myocardial infarction. **2. Analysis of Incorrect Options:** * **A. Elastic Recoil:** This was the main disadvantage of **Plain Old Balloon Angioplasty (POBA)**. Stents act as a mechanical scaffold specifically to prevent this recoil. [3] * **C. Restenosis:** While In-Stent Restenosis (ISR) occurs, it is a gradual process of vessel narrowing due to tissue growth. It is rarely fatal compared to the sudden, catastrophic nature of stent thrombosis. DES significantly reduced restenosis rates compared to Bare Metal Stents (BMS). * **D. Less efficacy in bifurcation lesions:** While bifurcation lesions are technically challenging and have higher complication rates, this is a procedural limitation rather than a fundamental disadvantage of the stenting technology itself. **Clinical Pearls for NEET-PG:** * **Dual Antiplatelet Therapy (DAPT):** Essential to prevent LST; typically required for 6–12 months post-DES. * **BMS vs. DES:** BMS have higher rates of **Restenosis** but lower risk of **Late Thrombosis** (because they endothelialize faster). * **Definitions:** Early Thrombosis ( 1 year).

Q: Which of the following is the most common complication of asymptomatic atrial fibrillation?

Stroke. **Explanation:** **Atrial Fibrillation (AF)** is characterized by disorganized atrial electrical activity, leading to an ineffective atrial "kick" [1]. This results in blood stasis, particularly within the **left atrial appendage (LAA)** [2]. According to Virchow’s triad, this stasis promotes thrombus formation. If a thrombus dislodges, it enters the systemic circulation (embolization), with the most common destination being the cerebral vasculature, leading to an **Ischemic Stroke** [2]. Importantly, the risk of stroke remains high regardless of whether the AF is symptomatic or asymptomatic (silent AF). **Analysis of Incorrect Options:** * **A. Sudden Death:** While AF can lead to heart failure or exacerbate underlying CAD, it is rarely a direct cause of sudden cardiac death (unlike ventricular fibrillation). * **C. Shock:** AF with a rapid ventricular rate can cause hemodynamic instability (cardiogenic shock) [1], but this is an acute presentation rather than the most common complication of the asymptomatic form. * **D. Pulmonary Embolism (PE):** PE results from right-sided thrombi (usually from DVT). While AF can cause right atrial thrombi, systemic embolization (Stroke) is significantly more frequent and clinically characteristic of AF. **High-Yield Clinical Pearls for NEET-PG:** * **CHA₂DS₂-VASc Score:** Used to predict stroke risk and guide anticoagulation therapy [2]. * **Anticoagulation:** Warfarin or NOACs (Apixaban, Dabigatran) are used for stroke prevention [2]. * **Silent AF:** Often diagnosed incidentally or after a "cryptogenic" stroke has already occurred. * **ECG Hallmark:** Irregularly irregular rhythm with absent P-waves and presence of fibrillatory (f) waves.

Q: Which condition typically requires a rapid reduction of blood pressure?

Hypertensive encephalopathy. **Explanation:** The distinction between a **Hypertensive Urgency** and a **Hypertensive Emergency** is a high-yield concept for NEET-PG. A hypertensive emergency is defined by severely elevated blood pressure (usually >180/120 mmHg) associated with **acute target organ damage**. **Hypertensive Encephalopathy (Correct Answer):** This is a classic hypertensive emergency. It occurs when blood pressure exceeds the limits of cerebral autoregulation, leading to vasogenic edema. Rapid (but controlled) reduction of Mean Arterial Pressure (MAP) by approximately 20-25% within the first hour is mandatory to prevent permanent neurological damage or death [1]. **Why other options are incorrect:** * **Cerebral Infarct:** In acute ischemic stroke, high BP is often a compensatory mechanism to maintain perfusion to the "ischemic penumbra." Rapidly lowering BP can worsen the infarct. Treatment is usually withheld unless BP is >220/120 mmHg (or >185/110 mmHg if thrombolysis is planned). * **Myocardial Infarction:** While BP management is important in MI to reduce afterload, the reduction is typically more gradual compared to the immediate urgency of encephalopathy, unless there is concomitant acute heart failure or aortic dissection. * **Any patient with hypertension:** Asymptomatic hypertension (Urgency) should never be lowered rapidly. Doing so can precipitate cerebral or myocardial ischemia due to a sudden drop in perfusion pressure. **Clinical Pearls for NEET-PG:** 1. **Drug of Choice:** IV Labetalol or Nicardipine are preferred for most emergencies [1]. **Sodium Nitroprusside** is used but carries a risk of cyanide toxicity [1]. 2. **Exception to the 25% rule:** In **Aortic Dissection**, BP must be reduced rapidly to a systolic of 100-120 mmHg within 20 minutes to prevent rupture. 3. **Avoid Nifedipine:** Sublingual Nifedipine is contraindicated in hypertensive emergencies as it causes unpredictable, precipitous drops in BP.

Q: All of the following are seen in cardiac tamponade except:

Kussmaul's sign. In cardiac tamponade, the accumulation of fluid in the pericardial space increases intrapericardial pressure, leading to the compression of cardiac chambers [1]. ### **Why Kussmaul’s Sign is the Correct Answer** **Kussmaul’s sign** is the paradoxical rise in Jugular Venous Pressure (JVP) during inspiration. It occurs when the right ventricle (RV) cannot accommodate the increased venous return during inspiration, usually due to a rigid pericardium. It is a hallmark of **Constrictive Pericarditis** [2] and Restrictive Cardiomyopathy. In **Cardiac Tamponade**, Kussmaul’s sign is characteristically **absent** because the intrapericardial fluid is "compliant" enough to allow some RV expansion, and the "y" descent in the JVP waveform is blunted or absent. ### **Analysis of Incorrect Options** * **Pulsus Paradoxus:** An exaggerated drop in systolic blood pressure (>10 mmHg) during inspiration. It is a classic finding in tamponade caused by exaggerated ventricular interdependence (the septum shifts toward the left ventricle as the RV fills). * **Diastolic Collapse of RV:** This is the most specific echocardiographic finding for tamponade. As intrapericardial pressure exceeds intracavitary pressure during early diastole, the RV free wall invaginates [1]. * **Electrical Alternans:** A pathognomonic ECG finding where the QRS amplitude varies from beat to beat. This is caused by the heart physically "swinging" back and forth within the large volume of pericardial fluid [1]. ### **High-Yield Clinical Pearls for NEET-PG** * **Beck’s Triad:** Hypotension, Muffled heart sounds, and Raised JVP. * **JVP in Tamponade:** Shows a prominent **'x' descent** but a **blunted/absent 'y' descent** (unlike Constrictive Pericarditis where 'y' is sharp). * **Low Voltage ECG:** Often the first clue to a large pericardial effusion [1]. * **Treatment:** Immediate **Pericardiocentesis** is the definitive management [1].

Q: Which of the following is true about malaria?

P. vivax causes enlargement of affected RBC. ### **Explanation** **Correct Option: C. *P. vivax* causes enlargement of affected RBC** The morphology of the host erythrocyte is a key diagnostic feature in peripheral blood smears. *Plasmodium vivax* and *P. ovale* have a predilection for young red cells (reticulocytes). Because reticulocytes are larger than mature erythrocytes, and the parasite further distorts the cell membrane, the infected RBCs appear **enlarged and pale**. In contrast, *P. falciparum* and *P. malariae* do not enlarge the host cell [1]. **Analysis of Incorrect Options:** * **A. *P. falciparum* can cause relapse:** This is false. Relapse occurs due to the activation of dormant liver stages called **hypnozoites**. Only *P. vivax* and *P. ovale* form hypnozoites [1]. *P. falciparum* and *P. malariae* can cause **recrudescence** (due to surviving erythrocytic forms), but not true relapse. * **B. *P. vivax* can be detected by HRP-2 Dipstick:** False. Histidine-Rich Protein 2 (HRP-2) is highly specific to ***P. falciparum*** [1]. Rapid Diagnostic Tests (RDTs) for *P. vivax* typically target **pLDH** (parasite Lactate Dehydrogenase). * **D. LDH card test quantitates the falciparum parasitemia:** False. While LDH tests can detect the presence of parasites, they are **qualitative or semi-quantitative** at best. The gold standard for quantitating parasitemia remains the examination of a **thick blood smear**. **High-Yield NEET-PG Pearls:** * **Schüffner’s dots:** Seen in *P. vivax* and *P. ovale*. * **Maurer’s clefts:** Seen in *P. falciparum*. * **Ziemann’s stippling:** Seen in *P. malariae*. * **Drug of Choice (DOC):** For hypnozoites (radical cure), **Primaquine** is used (ensure G6PD status first). * **Most common cause of Cerebral Malaria:** *P. falciparum*.

Q: A 41-year-old male schoolteacher, a nonsmoker, presents with lightheadedness, shortness of breath, "lack of stamina," and chest pain. On physical examination, vital signs are normal. The patient is overweight with a BMI of 33. Cardiovascular examination reveals a left parasternal heave, a harsh grade 3/6 systolic flow murmur, and a loud P2 sound. Chest radiographs are shown. What is the most likely diagnosis?

Pulmonary hypertension. ***Pulmonary hypertension*** - The triad of **left parasternal heave** (indicating RV hypertrophy), **loud P2** (elevated pulmonary artery pressure), and **systolic flow murmur** strongly suggests **pulmonary arterial hypertension**. - Chest X-ray findings of **prominent pulmonary arteries**, **RV enlargement**, and **peripheral pruning** are classic for pulmonary hypertension in a nonsmoker. *Mitral stenosis* - Would present with **mid-diastolic rumbling murmur** at the apex, not a systolic flow murmur at the left sternal border. - Typically causes **left atrial enlargement** and **pulmonary edema** on chest X-ray, not RV hypertrophy signs. *Chronic bronchitis with cor pulmonale* - Usually occurs in **chronic smokers** with long-standing **COPD** and chronic hypoxemia, which doesn't fit this nonsmoker patient. - Would present with **productive cough**, **barrel chest**, and evidence of **chronic lung disease** on chest X-ray. *Deconditioning due to obesity* - Would not cause **loud P2**, **left parasternal heave**, or **systolic flow murmur** - these are specific cardiac findings. - Deconditioning typically presents with **fatigue** and **shortness of breath** on exertion without specific cardiac examination abnormalities.

Question 1

Increased AV nodal blockade leads to termination of tachycardia in all except?

Accepted Answer

Atrial flutter

Answer

Atrial tachycardia

Answer

AVN

Answer

Orthodromic AV re-entry

Question 2

Which of the following is the most common complication of heart failure?

Accepted Answer

Hydrothorax

Answer

Pneumothorax

Answer

Pyothorax

Answer

Hemothorax

Question 3

What is the most common cause of shock in myocardial infarction?

Accepted Answer

Cardiogenic shock

Answer

Hypovolemic shock

Answer

Septic shock

Answer

Neurogenic shock

Question 4

What is the cause of essential (Primary) Hypertension?

Accepted Answer

Excessive sympathetic nervous system activity

Answer

Renal artery stenosis

Answer

Glomerulonephritis

Answer

Chronic renal failure

Question 5

What is a main disadvantage of stenting?

Accepted Answer

Late stent thrombosis

Answer

Elastic recoil

Answer

Restenosis

Answer

Less efficacy in bifurcation lesions

Question 6

Which of the following is the most common complication of asymptomatic atrial fibrillation?

Accepted Answer

Stroke

Answer

Sudden death

Answer

Shock

Answer

Pulmonary Embolism

Question 7

Which condition typically requires a rapid reduction of blood pressure?

Accepted Answer

Hypertensive encephalopathy

Answer

Cerebral infarct

Answer

Myocardial infarction

Answer

Any patient with hypertension

Question 8

All of the following are seen in cardiac tamponade except:

Accepted Answer

Kussmaul's sign

Answer

Pulsus paradoxus

Answer

Diastolic collapse of right ventricle on echocardiogram

Answer

Electrical alternans

Question 9

Which of the following is true about malaria?

Accepted Answer

P. vivax causes enlargement of affected RBC

Answer

P. falciparum can cause relapse

Answer

P. vivax can be detected by HRP-2 Dipstick

Answer

LDH card test quantitates the falciparum parasitemia

Question 10

A 41-year-old male schoolteacher, a nonsmoker, presents with lightheadedness, shortness of breath, "lack of stamina," and chest pain. On physical examination, vital signs are normal. The patient is overweight with a BMI of 33. Cardiovascular examination reveals a left parasternal heave, a harsh grade 3/6 systolic flow murmur, and a loud P2 sound. Chest radiographs are shown. What is the most likely diagnosis?

Accepted Answer

Pulmonary hypertension

Answer

Mitral stenosis

Answer

Chronic bronchitis with cor pulmonale

Answer

Deconditioning due to obesity

Cardiology — MCQs

Cardiology — MCQs

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