Cardiology Practice Questions

Q: A 49-year-old man has his serum lipids measured. Which pattern suggests the lowest risk for coronary artery disease?

Total cholesterol 202 mg/dL, HDL cholesterol 45 mg/dL. The risk of coronary artery disease (CAD) is not determined by total cholesterol alone but by the balance between atherogenic lipoproteins and protective ones [1]. The most reliable predictor among the given options is the **Total Cholesterol to HDL ratio (TC/HDL ratio)** [3]. A lower ratio indicates a lower cardiovascular risk. **1. Why Option D is Correct:** In Option D, the TC/HDL ratio is **4.48** (202/45). This is the lowest ratio among all choices. Furthermore, an HDL level >40 mg/dL in men is considered protective, whereas levels <40 mg/dL are independent risk factors for CAD [2]. Option D provides the best combination of a near-optimal total cholesterol and the highest HDL level. **2. Analysis of Incorrect Options:** * **Option A:** Ratio = **7.67** (215/28). This represents the highest risk due to high total cholesterol and very low HDL (well below the 40 mg/dL threshold). * **Option B:** Ratio = **5.0** (215/43). While the HDL is acceptable, the total cholesterol is higher than in Option D, leading to a higher overall ratio. * **Option C:** Ratio = **6.20** (180/29). Despite having the lowest total cholesterol, the very low HDL (29 mg/dL) significantly increases the risk, resulting in a worse ratio than Option D. **High-Yield Clinical Pearls for NEET-PG:** * **The "Good" vs. "Bad":** HDL is anti-atherogenic (removes cholesterol from foam cells via reverse cholesterol transport), while LDL is pro-atherogenic [1]. * **Target Ratios:** A TC/HDL ratio ** 5.0** indicates high risk [3]. * **Non-HDL Cholesterol:** Calculated as (Total Cholesterol - HDL). It is often a better predictor of risk than LDL alone, especially in patients with high triglycerides. * **Negative Risk Factor:** An HDL level **≥60 mg/dL** is considered a "negative" risk factor, meaning it removes one risk factor from the total cardiovascular risk profile.

Q: The murmur of hypertrophic cardiomyopathy is decreased in which of the following positions or maneuvers?

Supine position. **Explanation:** The murmur of **Hypertrophic Obstructive Cardiomyopathy (HOCM)** is a dynamic systolic ejection murmur. Its intensity depends on the degree of Left Ventricular Outflow Tract (LVOT) obstruction. The obstruction increases when the left ventricular volume (preload) decreases or contractility increases. **1. Why the Supine Position is Correct:** When a patient moves from a standing to a **supine position**, there is an increase in venous return to the heart (**increased preload**). This increased volume distends the left ventricle, moving the interventricular septum away from the mitral valve, thereby widening the LVOT and reducing the obstruction. Consequently, the intensity of the murmur **decreases** [1]. **2. Analysis of Incorrect Options:** * **Standing Position:** This leads to venous pooling in the lower limbs, decreasing venous return (decreased preload). This results in a smaller LV volume and **increased** murmur intensity. * **Valsalva Maneuver (Strain Phase):** This increases intrathoracic pressure, which significantly decreases venous return. The reduced LV volume worsens the obstruction and **increases** the murmur. * **Amyl Nitrite Inhalation:** This is a potent vasodilator that reduces systemic vascular resistance (decreased afterload). Lower afterload facilitates faster ejection and smaller LV dimensions, which **increases** the murmur [1]. **High-Yield Clinical Pearls for NEET-PG:** * **The Rule of Two:** HOCM and Mitral Valve Prolapse (MVP) are the **only** two murmurs that *increase* in intensity with Valsalva and Standing (maneuvers that decrease preload). * **Squatting vs. Standing:** Squatting increases both preload and afterload, thereby **decreasing** the HOCM murmur (similar to the supine position). * **Handgrip Exercise:** Increases afterload, which helps keep the LVOT open, thereby **decreasing** the HOCM murmur [1].

Q: What is not true about infective endocarditis?

Rose spots. Infective Endocarditis (IE) is a multisystem disease characterized by infection of the endocardial surface, typically the heart valves. The clinical manifestations result from three processes: local destructive infection, septic embolization, and circulating immune complexes. **Why "Rose spots" is the correct answer:** Rose spots are small, blanching, rose-colored maculopapules found on the chest or abdomen. They are pathognomonic for **Enteric (Typhoid) Fever**, caused by *Salmonella typhi*. They are not a feature of infective endocarditis. **Analysis of incorrect options:** * **Hematuria:** This is a common finding in IE [1]. It can occur due to **embolic renal infarction** or, more characteristically, due to **immune-complex mediated glomerulonephritis** (a classic "immunological phenomenon" in Duke’s criteria). * **Roth spots:** These are retinal hemorrhages with central pale spots (white centers) caused by immune complex-mediated vasculitis [3]. They are one of the minor Duke’s criteria. * **Hemiplegia:** Neurological complications occur in up to 40% of cases [1]. Hemiplegia typically results from **septic emboli** originating from vegetations (especially from the mitral valve) leading to an ischemic stroke or a ruptured mycotic aneurysm. **High-Yield Clinical Pearls for NEET-PG:** * **Duke’s Criteria:** Remember that "Immunological phenomena" include Roth spots, Osler nodes, and Glomerulonephritis [3]. "Vascular phenomena" include Janeway lesions, Mycotic aneurysms, and Septic emboli. * **Osler Nodes vs. Janeway Lesions:** Osler nodes are **Painful** (Ouch!) and immunologic; Janeway lesions are **Painless** and embolic. * **Most common cause:** *Staphylococcus aureus* is now the most common cause of acute IE globally and in IV drug users [2]. *Viridans streptococci* remain common in subacute cases following dental procedures.

Q: What is the antihypertensive drug of choice for elderly patients with hypertension?

Calcium channel blocker or Diuretics. In elderly patients, hypertension is often characterized by **Isolated Systolic Hypertension (ISH)**. This occurs due to age-related arterial stiffening and reduced vascular compliance [1]. Pathophysiologically, the elderly tend to have **low-renin hypertension** and are more sensitive to salt intake. **Why Option D is Correct:** * **Calcium Channel Blockers (CCBs):** Long-acting dihydropyridines (e.g., Amlodipine) are highly effective in the elderly because they directly reduce peripheral vascular resistance, addressing the arterial stiffness characteristic of this age group [2]. * **Thiazide Diuretics:** These are particularly effective in low-renin, salt-sensitive hypertension [4]. Large-scale trials (like ALLHAT and SHEP) have consistently shown that diuretics and CCBs significantly reduce the risk of stroke and cardiovascular events in the elderly. **Why Other Options are Incorrect:** * **ACE Inhibitors (Options A, B, C):** While excellent for patients with diabetes or heart failure, ACEIs are generally less effective as monotherapy in the elderly due to the naturally low plasma renin levels found in this population. * **Beta-Blockers (Option B):** These are no longer considered first-line for uncomplicated hypertension in the elderly [3]. They are less effective at preventing strokes and can increase the risk of new-onset diabetes and bradycardia in older patients. **High-Yield NEET-PG Pearls:** * **JNC-8 Guidelines:** Recommend Thiazides or CCBs as first-line for the general non-black population (including elderly); however, for the **Black population**, Thiazides or CCBs are strictly preferred over ACEIs. * **Drug of Choice for ISH:** Long-acting Dihydropyridine CCBs [2]. * **Side Effect Note:** When using diuretics in the elderly, monitor for hyponatremia and hypokalemia, as they are more susceptible to electrolyte imbalances.

Q: A patient presents with normal angiography but exhibits severe hypokinesia of the left ventricular wall. Which of the following is the most likely diagnosis?

Takotsubo cardiomyopathy. The clinical scenario describes a classic presentation of **Takotsubo Cardiomyopathy**, also known as "Stress-induced Cardiomyopathy" or "Broken Heart Syndrome." **1. Why Takotsubo Cardiomyopathy is correct:** The hallmark of this condition is **transient systolic dysfunction** of the apical and/or mid-segments of the left ventricle, leading to a characteristic "ballooning" appearance (resembling a Japanese octopus trap). Crucially, patients present with symptoms mimicking an acute coronary syndrome (chest pain, ECG changes, elevated troponins), but **coronary angiography reveals normal or non-obstructive arteries**. It is typically triggered by intense emotional or physical stress, leading to a "catecholamine surge" that causes myocardial stunning. **2. Why the other options are incorrect:** * **HOCM:** Characterized by asymmetrical septal hypertrophy and dynamic outflow obstruction, not global or wall-specific hypokinesia. Angiography is not the primary diagnostic tool; echocardiography showing a thickened septum is key. * **Restrictive Cardiomyopathy:** Primarily a disorder of **diastolic function** (impaired filling) with relatively preserved systolic function (normal ejection fraction) in early stages. * **Dilated Cardiomyopathy (DCM):** While DCM involves ventricular hypokinesia and dilatation, it is usually a chronic, progressive condition [1]. In a NEET-PG context, the specific mention of "normal angiography" alongside acute severe hypokinesia is the classic "trigger" for a Takotsubo diagnosis. **Clinical Pearls for NEET-PG:** * **Demographics:** Most common in post-menopausal women. * **Echocardiography:** Shows "Apical Ballooning" with basal hyperkinesis. * **Prognosis:** Generally excellent, with ventricular function returning to normal within weeks. * **Key differentiator:** Symptoms of MI + Normal Coronaries + Stress Trigger = Takotsubo.

Q: A 23-year-old woman is diagnosed with mitral valve prolapse as seen on echocardiography for evaluation of a systolic murmur. Which of the following is most characteristic of mitral valve prolapse?

Usually a benign course. **Explanation:** **Mitral Valve Prolapse (MVP)**, also known as Barlow’s syndrome, is the most common valvular heart disease, characterized by the displacement of an abnormally thickened mitral valve leaflet into the left atrium during systole. **1. Why Option B is Correct:** The vast majority of patients with MVP are asymptomatic and follow a **benign clinical course**. Most cases are discovered incidentally during routine physical examination (finding a mid-systolic click [1]) or echocardiography. While complications can occur, they represent the exception rather than the rule for the general population with this condition. **2. Why Other Options are Incorrect:** * **Option A:** The characteristic murmur of MVP is a **late systolic murmur**, typically preceded by a **mid-systolic click [1]**. A pansystolic (holosystolic) murmur is more indicative of chronic, severe mitral regurgitation [2]. * **Option C & D:** While Sudden Cardiac Death (SCD) and Infective Endocarditis (IE) are recognized complications of MVP, they are **rare**. SCD occurs in <1% of cases annually, and the risk of IE is significantly lower than in other valvular pathologies, making these "characteristic" of the complications, but not the disease itself. **High-Yield Clinical Pearls for NEET-PG:** * **Auscultation:** Mid-systolic click [1] followed by a late systolic murmur. * **Dynamic Auscultation:** Maneuvers that decrease preload (Standing, Valsalva) make the click/murmur occur **earlier** in systole and often louder. Maneuvers that increase preload (Squatting) make it occur **later**. * **Association:** Strongly associated with connective tissue disorders like **Marfan syndrome** and Ehlers-Danlos syndrome. * **Pathology:** Characterized by **myxomatous degeneration** of the valve leaflets.

Q: Treatment of orthostatic hypotension includes all except:

Dopamine. Explanation: Orthostatic hypotension (OH) is defined as a sustained reduction in systolic blood pressure of at least 20 mmHg or diastolic blood pressure of at least 10 mmHg within 3 minutes of standing. The management strategy focuses on increasing intravascular volume and enhancing peripheral vascular resistance. **Why Dopamine is the Correct Answer (The Exception):** Dopamine is an intravenous inopressor used primarily in acute, hemodynamically unstable states like cardiogenic or septic shock. It is **not** a treatment for chronic orthostatic hypotension because it cannot be administered orally and has a very short half-life. Furthermore, at low doses, dopamine can cause vasodilation (via D1 receptors), which could theoretically worsen hypotension. **Analysis of Other Options:** * **High salt and fluid intake:** This is the first-line non-pharmacological intervention [1]. Increasing sodium (6–10 g/day) and fluid (2–3 L/day) expands the extracellular fluid volume to prevent postural collapse. * **Physical countermaneuvers:** Techniques such as leg crossing, muscle tensing, and squatting increase venous return (preload) to the heart, providing immediate symptomatic relief. * **Fludrocortisone:** This is the first-line pharmacological treatment [1]. It is a potent mineralocorticoid that promotes renal sodium reabsorption, thereby expanding plasma volume and sensitizing alpha-adrenergic receptors. **NEET-PG High-Yield Pearls:** 1. **Midodrine:** A selective alpha-1 agonist; it is the preferred drug when volume expansion alone is insufficient. 2. **Droxidopa:** A synthetic precursor of norepinephrine, recently approved for neurogenic OH. 3. **Pyridostigmine:** An acetylcholinesterase inhibitor that improves ganglionic transmission, helping to increase BP during standing without causing supine hypertension. 4. **Rule out "Reversible Causes":** Always check for drugs (diuretics, alpha-blockers) or dehydration before starting long-term therapy.

Question 1

A 49-year-old man has his serum lipids measured. Which pattern suggests the lowest risk for coronary artery disease?

Accepted Answer

Total cholesterol 202 mg/dL, HDL cholesterol 45 mg/dL

Answer

Total cholesterol 215 mg/dL, high-density lipoprotein (HDL) cholesterol 28 mg/dL

Answer

Total cholesterol 215 mg/dL, HDL cholesterol 43 mg/dL

Answer

Total cholesterol 180 mg/dL, HDL cholesterol 29 mg/dL

Question 2

The murmur of hypertrophic cardiomyopathy is decreased in which of the following positions or maneuvers?

Accepted Answer

Supine position

Answer

Standing position

Answer

Valsalva maneuver

Answer

Amyl nitrite inhalation

Question 3

A 30-year-old male, a labourer and chronic smoker and alcoholic, presents with acute chest pain, severe back pain radiating to the interscapular area. What is the most likely diagnosis?

Accepted Answer

Ruptured aortic aneurysm

Answer

Pericarditis

Answer

Tension pneumothorax

Answer

Myocardial infarction

Question 4

A 30-year-old man presents with significant nose bleeding, worsening headache over several days, and fatigue. Examination reveals markedly increased brachial artery pressure, decreased femoral pressure, and delayed femoral pulses. The patient shows no external signs of inflammation. Which of the following is the most likely diagnosis?

Accepted Answer

Coarctation of the aorta

Answer

Cor pulmonale

Answer

Dissecting aneurysm of the right common iliac artery

Answer

Obstruction of the superior vena cava

Question 5

What is not true about infective endocarditis?

Accepted Answer

Rose spots

Answer

Hematuria

Answer

Roth spots

Answer

Hemiplegia

Question 6

The 'square root sign' is an indication of which of the following conditions?

Accepted Answer

Constrictive pericarditis

Answer

Hypertrophic cardiomyopathy

Answer

Restrictive cardiomyopathy

Answer

None of the above

Question 7

What is the antihypertensive drug of choice for elderly patients with hypertension?

Accepted Answer

Calcium channel blocker or Diuretics

Answer

ACE inhibitor or Diuretics

Answer

ACE inhibitor or Beta blocker

Answer

ACE inhibitor or Calcium channel blocker

Question 8

A patient presents with normal angiography but exhibits severe hypokinesia of the left ventricular wall. Which of the following is the most likely diagnosis?

Accepted Answer

Takotsubo cardiomyopathy

Answer

Hypertrophic Obstructive Cardiomyopathy (HOCM)

Answer

Restrictive cardiomyopathy

Answer

Dilated cardiomyopathy (DCM)

Question 9

A 23-year-old woman is diagnosed with mitral valve prolapse as seen on echocardiography for evaluation of a systolic murmur. Which of the following is most characteristic of mitral valve prolapse?

Accepted Answer

Usually a benign course

Answer

A pansystolic murmur

Answer

Sudden death

Answer

Infective endocarditis

Question 10

Treatment of orthostatic hypotension includes all except:

Accepted Answer

Dopamine

Answer

High salt and fluid intake

Answer

Physical countermaneuvers

Answer

Fludrocortisone

Cardiology — MCQs

Cardiology — MCQs

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