Cardiology Practice Questions

Q: What is the most common parasite causing myocarditis?

Trichinella. **Explanation:** **1. Why Trichinella is correct:** *Trichinella spiralis* is widely recognized as the most common parasite to cause myocarditis globally. While the adult worms live in the intestines, the larvae migrate to striated muscles. Although the larvae do not encyst in the cardiac muscle (unlike skeletal muscle), their migration through the myocardium triggers a profound inflammatory response, eosinophilic infiltration, and interstitial edema. This can lead to arrhythmias, heart failure, and is the leading cause of death in the second or third week of trichinellosis. **2. Why the other options are incorrect:** * **Trypanosoma cruzi (Option B):** This causes **Chagas disease**. While it is a major cause of chronic parasitic cardiomyopathy (leading to apical aneurysms and RBBB) particularly in South America, *Trichinella* remains the more frequent cause of acute parasitic myocarditis in broader clinical literature. * **Ascaris (Option C):** *Ascaris lumbricoides* primarily involves the GI tract and the lungs (Loeffler’s syndrome). Cardiac involvement is extremely rare and usually incidental [1]. * **Plasmodium (Option D):** Malaria typically causes microvascular sequestration and anemia. While "malarial myocarditis" is described in severe *P. falciparum*, it is a rare complication compared to the frequency of myocardial involvement in trichinellosis. **3. Clinical Pearls for NEET-PG:** * **Classic Triad of Trichinellosis:** Periorbital edema, myositis (muscle pain/tenderness), and eosinophilia. * **ECG Changes:** Look for non-specific ST-T wave changes or conduction delays. * **Diagnosis:** Muscle biopsy (showing larvae in skeletal muscle) or serology (ELISA). * **Treatment:** Albendazole/Mebendazole + Corticosteroids (to reduce the inflammatory response to dying larvae).

Q: What is the management of uncomplicated essential hypertension?

Diet modification, exercise, and medication. **Explanation:** The management of uncomplicated essential hypertension follows a multi-modal approach aimed at reducing long-term cardiovascular risk. According to current JNC and AHA/ACC guidelines, the cornerstone of therapy is the combination of **Lifestyle Modifications** and **Pharmacotherapy** [1]. 1. **Why Option C is Correct:** Hypertension is a chronic systemic condition. Lifestyle changes (DASH diet, sodium restriction <2.4g/day, and aerobic exercise) can lower systolic BP by 5–20 mmHg. However, in most patients, lifestyle changes alone are insufficient to reach the target BP (<140/90 or <130/80 mmHg depending on guidelines). Therefore, the integration of diet, exercise, and medication (typically ACE inhibitors, ARBs, CCBs, or Thiazides) provides the most effective risk reduction [1]. 2. **Why Other Options are Incorrect:** * **Option A:** Untreated hypertension leads to end-organ damage (LVH, stroke, chronic kidney disease) [1]. * **Option B:** While essential, lifestyle modification alone is usually reserved only for "Pre-hypertension" or as a trial in very low-risk Stage 1 patients for a short period. * **Option D:** Medication without lifestyle changes is suboptimal; weight loss and salt restriction significantly enhance the efficacy of antihypertensive drugs [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Initial Drug of Choice:** For non-black patients, ACE inhibitors, ARBs, or CCBs are preferred. For the black population, Thiazides or CCBs are first-line [1]. * **Most Common Cause:** Essential hypertension (95%); the most common cause of secondary hypertension is **Renal Parenchymal Disease** [1]. * **Weight Loss:** This is the most effective lifestyle modification (approx. 1 mmHg drop per 1 kg weight loss). * **Target BP:** Generally <130/80 mmHg for all patients as per recent aggressive guidelines [1].

Q: Which of the following is a common risk factor for coronary heart disease, except?

Decreased homocysteinaemia. **Explanation:** The correct answer is **B. Decreased homocysteinaemia**. In clinical practice, it is **Hyperhomocysteinaemia** (elevated levels of homocysteine in the blood) that acts as an independent risk factor for coronary heart disease (CHD). Homocysteine promotes atherosclerosis by causing endothelial dysfunction, oxidative stress, and stimulating smooth muscle cell proliferation. Therefore, "decreased" levels are not a risk factor. **Analysis of Options:** * **A. Family History:** A positive family history (especially in first-degree male relatives 60 mg/dL) is considered cardioprotective [3]. * **D. Type 1 DM:** Diabetes Mellitus (both Type 1 and Type 2) is considered a **"Coronary Artery Disease Risk Equivalent,"** meaning a diabetic patient has the same 10-year risk of a myocardial infarction as a non-diabetic patient who has already had a previous heart attack. **High-Yield Clinical Pearls for NEET-PG:** * **Modifiable Risk Factors:** Hypertension, Dyslipidemia (High LDL, Low HDL), Smoking, Diabetes, and Obesity [2]. * **Non-Modifiable Risk Factors:** Age, Male gender, and Family history [1]. * **Emerging Risk Factors:** Elevated Lipoprotein(a), High-sensitivity C-reactive protein (hs-CRP), and Hyperhomocysteinaemia. * **Homocysteine Metabolism:** Deficiencies in Vitamin B12, B6, and Folic acid can lead to hyperhomocysteinaemia.

Q: Which valvular lesion is being repaired in a 20-year-old man presenting with a malar flush?

Mitral stenosis. **Explanation:** The correct answer is **Mitral Stenosis (MS)**. **Why Mitral Stenosis is correct:** The "malar flush" (also known as *facies mitralis*) is a classic clinical sign of chronic, severe mitral stenosis [1]. It is characterized by plum-colored or violaceous patches over the cheeks. The underlying pathophysiology involves a chronic decrease in cardiac output leading to systemic vasoconstriction and pulmonary hypertension [1]. This results in secondary right-sided heart failure and venous stasis, causing the capillaries in the malar region to become engorged and cyanotic [1]. **Why the other options are incorrect:** * **Mitral Regurgitation (MR):** While MR also affects the mitral valve, it typically presents with symptoms of left heart failure (dyspnea, fatigue) and a pansystolic murmur, but it does not classically produce the malar flush [2]. * **Aortic Stenosis (AS):** AS is characterized by the triad of Angina, Syncope, and Dyspnea (SAD). Patients often appear pale due to low cardiac output, rather than flushed. * **Aortic Regurgitation (AR):** AR presents with "peripheral signs" of hyperdynamic circulation (e.g., Corrigan’s pulse, de Musset’s sign, Quincke’s pulse) and a wide pulse pressure, but not a malar flush [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of MS:** Rheumatic Heart Disease (99% of cases). * **Auscultation:** Loud S1, Opening Snap (OS), and a mid-diastolic rumbling murmur heard best at the apex in the left lateral position [1]. * **ECG Findings:** "P-mitrale" (broad, notched P-waves in Lead II) indicating left atrial enlargement. * **Complications:** Atrial fibrillation (due to LA enlargement) and systemic thromboembolism are common [1].

Q: A 38-year-old man develops severe retrosternal chest pain radiating to the back, aggravated by breathing and movement. He has no significant past medical history but had a mild upper respiratory tract infection 1 week ago. His electrocardiogram is shown in Figure. Which of the following is the most likely cause for his condition?

A viral infection. ***A viral infection*** - The **pleuritic chest pain** that worsens with breathing and movement, following a recent **upper respiratory tract infection**, is highly suggestive of **viral pericarditis**. - The **ECG pattern** would typically show **diffuse concave ST elevation** and **PR depression** without reciprocal changes, characteristic of **pericarditis** rather than myocardial infarction. *Occlusion of the left anterior descending artery* - Would cause **STEMI** with **convex ST elevation** in leads V1-V6, I, and aVL, not the diffuse pattern seen in pericarditis. - Pain would be **crushing substernal** and not typically **pleuritic** or positional in nature. *Occlusion of the circumflex artery* - Would present with **posterior STEMI** showing **ST depression** in V1-V3 and **ST elevation** in posterior leads (V7-V9). - The **pleuritic nature** of pain and **positional aggravation** are not typical features of myocardial infarction. *Dissection of the aortic artery* - Typically presents with **sudden, tearing chest pain** radiating to the back, but pain is **not pleuritic** or positional. - Would show **widened mediastinum** on chest X-ray and **pulse deficits** or **blood pressure differences** between arms, not ECG changes of pericarditis.

Q: Beck's triad of cardiac tamponade includes all except?

Hypertension. **Explanation:** Beck’s triad is a classic clinical sign used to diagnose **acute cardiac tamponade**, a life-threatening condition where fluid accumulates in the pericardial sac, leading to increased intrapericardial pressure and impaired cardiac filling [1]. **Why Hypertension is the Correct Answer:** In cardiac tamponade, the external pressure on the heart prevents the ventricles from expanding fully during diastole. This leads to a significant drop in stroke volume and cardiac output. Consequently, patients present with **hypotension** (low blood pressure), not hypertension. Therefore, hypertension is the "except" in this list. **Analysis of Other Options:** * **Hypotension:** As explained, reduced stroke volume leads to a drop in systemic arterial blood pressure. * **Raised Jugular Venous Pressure (JVP):** Because the right heart cannot fill properly due to external compression, venous return is backed up, leading to jugular venous distension. * **Absent (Muffled) Heart Sounds:** The accumulation of fluid in the pericardial space acts as an insulating barrier between the heart and the chest wall, making heart sounds appear distant or faint on auscultation. **High-Yield Clinical Pearls for NEET-PG:** * **Pulsus Paradoxus:** A key finding in tamponade defined as an inspiratory fall in systolic BP >10 mmHg. * **ECG Findings:** Look for **low voltage complexes** and **electrical alternans** (alternating height of QRS complexes due to the heart "swinging" in fluid) [1]. * **Echocardiography:** The gold standard for diagnosis; look for **diastolic collapse** of the right atrium and right ventricle [1]. * **Management:** The definitive treatment is urgent **pericardiocentesis**.

Question 1

What is the most common parasite causing myocarditis?

Accepted Answer

Trichinella

Answer

Trypanosome

Answer

Ascaris

Answer

Plasmodium

Question 2

What is the management of uncomplicated essential hypertension?

Accepted Answer

Diet modification, exercise, and medication

Answer

No treatment needed

Answer

Diet modification and exercise

Answer

Medication alone

Question 3

Which of the following is a common risk factor for coronary heart disease, except?

Accepted Answer

Decreased homocysteinaemia

Answer

Family history of heart disease

Answer

HDL < 40 mg/dL

Answer

Type 1 DM

Question 4

Which valvular lesion is being repaired in a 20-year-old man presenting with a malar flush?

Accepted Answer

Mitral stenosis

Answer

Mitral regurgitation

Answer

Aortic stenosis

Answer

Aortic regurgitation

Question 5

Pulsus paradoxus is seen in all except?

Accepted Answer

Intermittent positive-pressure ventilation (IPPV)

Answer

Chronic obstructive pulmonary disease (COPD)

Answer

Pulmonary embolism

Answer

Constrictive pericarditis

Question 6

A young patient presents with a systolic murmur at the apex. The murmur increases with both handgrip and Valsalva maneuver. Which of the following conditions is most likely?

Accepted Answer

Mitral Valve Prolapse (MVP)

Answer

Atrial Septal Defect (ASD)

Answer

Aortic Stenosis

Answer

Ventricular Septal Defect (VSD)

Question 7

A 38-year-old man develops severe retrosternal chest pain radiating to the back, aggravated by breathing and movement. He has no significant past medical history but had a mild upper respiratory tract infection 1 week ago. His electrocardiogram is shown in Figure. Which of the following is the most likely cause for his condition?

Accepted Answer

A viral infection

Answer

Occlusion of the left anterior descending artery

Answer

Occlusion of the circumflex artery

Answer

Dissection of the aortic artery

Question 8

Pulsus paradoxus is characteristically seen in cardiac tamponade. Absence of pulsus paradoxus is seen when cardiac tamponade is associated with all except one of the following?

Accepted Answer

Mitral regurgitation (MR)

Answer

Atrial septal defect (ASD)

Answer

Ventricular septal defect (VSD)

Answer

Aortic regurgitation (AR)

Question 9

Which of the following dietary interventions reduces the further risk in patients who have had a myocardial infarction (MI)?

Accepted Answer

Omega-3 polyunsaturated fatty acids

Answer

High fiber diet

Answer

Sterol esters

Answer

Potassium supplements

Question 10

Beck's triad of cardiac tamponade includes all except?

Accepted Answer

Hypertension

Answer

Absent heart sounds

Answer

Raised jugular venous pressure (JVP)

Answer

Hypotension

Cardiology — MCQs

Cardiology — MCQs

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