Cardiology Practice Questions

Q: Severe hypertension is defined if systolic BP is greater than:

180 mmHg. **Explanation:** The classification of hypertension is based on the **JNC 8** and **ESC/ESH guidelines**, which categorize blood pressure severity to guide clinical management. **1. Why 180 mmHg is Correct:** According to standard clinical guidelines, **Grade 3 (Severe) Hypertension** is defined as a Systolic Blood Pressure (SBP) **≥180 mmHg** and/or a Diastolic Blood Pressure (DBP) **≥110 mmHg** [1]. At this level, the risk of acute target organ damage (TOD) increases significantly. If this severe elevation is associated with acute TOD (e.g., encephalopathy, MI, or stroke), it is termed a **Hypertensive Emergency**; if no acute TOD is present, it is called **Hypertensive Urgency** [1]. **2. Analysis of Incorrect Options:** * **A. 140 mmHg:** This is the threshold for **Grade 1 (Mild) Hypertension** (SBP 140–159 mmHg). It marks the point where pharmacological intervention is usually initiated if lifestyle modifications fail. * **B. 160 mmHg:** This is the threshold for **Grade 2 (Moderate) Hypertension** (SBP 160–179 mmHg). * **D. 200 mmHg:** While clinically alarming, this is not the formal threshold for the definition of "severe" hypertension in standard classification systems. **High-Yield Clinical Pearls for NEET-PG:** * **Hypertensive Crisis:** SBP >180 or DBP >120 mmHg. * **Management Goal (Emergency):** Reduce Mean Arterial Pressure (MAP) by no more than **25% within the first hour** to prevent cerebral hypoperfusion [1], except in cases of Aortic Dissection or Ischemic Stroke. * **Drug of Choice:** **IV Labetalol** or **Nicardipine** are commonly used; **Sodium Nitroprusside** is reserved for refractory cases due to cyanide toxicity risks [1].

Q: In the JVP tracing, which condition is characterized by the absence of 'a' waves?

Atrial fibrillation. ### Explanation The **'a' wave** in the Jugular Venous Pulse (JVP) represents **right atrial contraction** occurring at the end of diastole. For an 'a' wave to be visible, there must be a coordinated, forceful contraction of the atrial myocardium. **Why Atrial Fibrillation (AF) is correct:** In AF, the organized electrical activity of the atria is replaced by rapid, chaotic fibrillatory waves [1]. This leads to a loss of mechanical atrial contraction (atrial "kick"). Without a coordinated contraction, the 'a' wave disappears from the JVP tracing. **Analysis of Incorrect Options:** * **B. Mitral Stenosis:** Characterized by **prominent (giant) 'a' waves** because the right atrium must contract harder against a non-compliant right ventricle (due to secondary pulmonary hypertension) [2]. * **C. Tricuspid Atresia:** Characterized by **prominent 'a' waves** because the right atrium contracts against a blind/atretic tricuspid valve, often shunting blood through an ASD. * **D. Myocardial Infarction:** While a massive RV infarct can dampen waves, it does not typically cause the complete absence of 'a' waves unless associated with an arrhythmia like AF. **High-Yield Clinical Pearls for NEET-PG:** * **Absent 'a' wave:** Atrial Fibrillation [1]. * **Cannon 'a' waves:** Occur when the atrium contracts against a closed tricuspid valve. Seen in **Complete Heart Block** (irregular), Ventricular Tachycardia, and Junctional Rhythms (regular). * **Giant/Prominent 'a' waves:** Seen in Tricuspid Stenosis, Pulmonary Stenosis, and Right Ventricular Hypertrophy (Pulmonary Hypertension). * **Giant 'cv' waves:** Pathognomonic for **Tricuspid Regurgitation**. * **Steep 'y' descent:** Seen in Constrictive Pericarditis (Friedreich’s sign) and Tricuspid Regurgitation. * **Slow/Absent 'y' descent:** Seen in Cardiac Tamponade and Tricuspid Stenosis.

Q: A 45-year-old woman presents with increasing shortness of breath on exertion and fatigue. Physical examination reveals a loud systolic ejection murmur best heard at the left sternal border, which increases with standing. A double apical impulse is also noted. What is the most likely diagnosis for this patient presenting with a systolic murmur?

Hypertrophic obstructive cardiomyopathy (HOCM). ### Explanation **Correct Answer: B. Hypertrophic obstructive cardiomyopathy (HOCM)** The clinical presentation is classic for **HOCM**. The key diagnostic feature here is the **dynamic nature of the murmur**. 1. **Mechanism:** The murmur in HOCM is a systolic ejection murmur caused by left ventricular outflow tract (LVOT) obstruction [1]. 2. **Maneuvers:** Standing reduces venous return (preload), which decreases the left ventricular volume. A smaller ventricle increases the degree of obstruction, thereby **increasing the intensity** of the murmur. 3. **Physical Signs:** The "double apical impulse" (or triple) is due to a forceful atrial contraction against a stiff ventricle (S4) followed by the ventricular lift [1]. **Why Incorrect Options are Wrong:** * **A. Aortic Stenosis (AS):** While AS also presents with a systolic ejection murmur, it is best heard at the right second intercostal space [2]. Crucially, the AS murmur **decreases** with standing (less preload = less flow across the valve). * **C. Mitral Regurgitation (MR):** MR presents with a holosystolic murmur at the apex radiating to the axilla. It generally decreases with standing due to reduced afterload/preload [3]. * **D. Tricuspid Regurgitation (TR):** TR is a holosystolic murmur heard at the lower left sternal border that characteristically increases with **inspiration** (Carvallo’s sign), not standing. **NEET-PG High-Yield Pearls:** * **The "Rule of Two":** Most murmurs decrease with standing/Valsalva (due to less blood in the heart). Only **HOCM** and **Mitral Valve Prolapse (MVP)** increase in intensity with these maneuvers. * **Handgrip Exercise:** Increases afterload; this **decreases** the HOCM murmur but **increases** MR and AR murmurs. * **Drug of Choice:** Beta-blockers (first-line) to improve diastolic filling and reduce the gradient. Avoid Nitrates and Diuretics as they worsen the obstruction.

Q: A patient presents with angina, dyspnea, and syncope. What is the most likely diagnosis?

Aortic stenosis. ### Explanation **Correct Answer: A. Aortic Stenosis** The classic triad of **Angina, Dyspnea (Heart Failure), and Syncope** is the hallmark presentation of symptomatic **Aortic Stenosis (AS)**. This is a high-yield clinical association often remembered by the mnemonic **"SAD"** (Syncope, Angina, Dyspnea). * **Angina:** Occurs due to increased myocardial oxygen demand (hypertrophied left ventricle) and decreased supply (compression of coronary arteries) [3]. * **Syncope:** Typically exertional, caused by the inability of the heart to increase cardiac output across a fixed, narrowed orifice during exercise, leading to cerebral hypoperfusion [1]. * **Dyspnea:** Indicates the onset of left ventricular failure and pulmonary venous congestion. **Why other options are incorrect:** * **B. Aortic Regurgitation:** Typically presents with features of high stroke volume and wide pulse pressure (e.g., Water-hammer pulse, Quincke’s sign). While it can cause dyspnea and angina, the classic "SAD" triad is specific to stenosis. * **C & D. ASD and VSD:** These are congenital shunts. **ASD** often remains asymptomatic until adulthood, presenting with exercise intolerance or palpitations (atrial arrhythmias). **VSD** typically presents with a pansystolic murmur and features of congestive heart failure in infancy or childhood, not the classic adult triad of AS. **NEET-PG High-Yield Pearls:** 1. **Murmur of AS:** Harsh crescendo-decrescendo systolic murmur heard best at the right second intercostal space, radiating to the **carotids** [2]. 2. **Physical Sign:** *Pulsus parvus et tardus* (slow-rising, low-amplitude pulse). 3. **Prognosis:** Once symptoms appear, survival drops significantly (Average survival: 2 years for Heart Failure, 3 years for Syncope, 5 years for Angina). 4. **Management:** Symptomatic severe AS requires **Aortic Valve Replacement (AVR)** or TAVI [1]. Medical therapy is generally ineffective for the mechanical obstruction [1].

Q: Which of the following features is characteristic of constrictive pericarditis, helping to differentiate it from restrictive cardiomyopathy?

Thickened pericardium is present. Explanation: Constrictive Pericarditis (CP) and Restrictive Cardiomyopathy (RCM) often present with similar symptoms of right-sided heart failure. The fundamental difference lies in the pathology: CP is a disease of the pericardium (extrinsic compression), while RCM is a disease of the myocardium (intrinsic stiffness) [3]. 1. Why Option D is Correct: A thickened, fibrotic, or calcified pericardium (typically >3-4 mm on CT or MRI) is the hallmark of Constrictive Pericarditis [1]. This rigid shell limits diastolic filling. In contrast, the pericardium in RCM is usually of normal thickness. 2. Analysis of Incorrect Options: * Option A: In CP, there is equalization of diastolic pressures in all four cardiac chambers (the "Square Root Sign" or "Dip and Plateau" pattern). This is a shared feature with RCM, though it is more classic in CP. * Option B: While a small effusion can coexist, it is not a diagnostic differentiator. The defining feature of CP is the chronic scarring and loss of elasticity of the pericardium, not the presence of fluid [1]. * Option C: Septal hypertrophy is a feature of hypertrophic cardiomyopathy or certain infiltrative RCMs (like amyloidosis), but it is not a feature of CP. In CP, the septum often shows "septal bounce" due to ventricular interdependence. NEET-PG High-Yield Pearls: * Ventricular Interdependence: This is the most reliable physiological differentiator. In CP, inspiration causes the nasal septum to shift toward the left ventricle (decreased LV filling), whereas in RCM, the chambers are independent. * Kussmaul’s Sign: Paradoxical rise in JVP during inspiration; seen in both, but more common in CP. * Pericardial Knock: A high-pitched sound heard in early diastole in CP (due to sudden cessation of ventricular filling). * Gold Standard Imaging: Cardiac MRI or CT to measure pericardial thickness. Lateral X-rays may also detect pericardial calcification [2].

Q: A 60-year-old female presented to the ER with chest pain and dyspnea, along with palpitations, nausea, vomiting, and a few episodes of syncope. MI was suspected. ECG and lab findings revealed raised cardiac enzymes. ECHO was also done. The patient was planned for coronary angiography, but no coronary artery stenosis was observed. What is the drug of choice for the above condition?

Propranolol. ### Explanation The clinical presentation describes a classic case of **Takotsubo Cardiomyopathy** (also known as "Broken Heart Syndrome" or "Stress-induced Cardiomyopathy"). **Why Propranolol is the Correct Answer:** Takotsubo Cardiomyopathy typically occurs in postmenopausal women following intense emotional or physical stress. The pathophysiology involves a **"catecholamine surge"** leading to myocardial stunning, apical ballooning, and left ventricular dysfunction. This mimics an Acute Coronary Syndrome (ACS) with chest pain, ST-segment changes, and elevated cardiac enzymes, but **coronary angiography reveals normal/non-obstructive arteries**. [2] * **Beta-blockers (like Propranolol)** are the mainstay of treatment because they antagonize the effects of excess catecholamines, reduce myocardial oxygen demand, and help prevent complications like left ventricular outflow tract (LVOT) obstruction and arrhythmias. [1] **Why Other Options are Incorrect:** * **Streptokinase:** This is a thrombolytic used for STEMI. Since angiography confirmed no coronary stenosis (no clot), thrombolysis is contraindicated and would only increase bleeding risk. [1] * **Aspirin & Rosuvastatin:** These are standard for atherosclerotic Coronary Artery Disease (CAD). While often started empirically in the ER for suspected MI, they do not treat the underlying catecholamine-driven mechanism of Takotsubo once CAD is ruled out. **Clinical Pearls for NEET-PG:** * **ECHO Finding:** Pathognomonic "Apical Ballooning" (hyperkinesis of the base and akinesis of the apex), resembling a Japanese octopus trap (*Takotsubo*). * **Demographics:** Most common in postmenopausal females. * **Prognosis:** Generally excellent; ventricular function usually recovers spontaneously within 1–4 weeks with supportive care. * **Trigger:** Excessive sympathetic stimulation is the key driver. [2]

Q: Which of the following arteries is most common to undergo atherosclerotic changes leading to coronary artery disease?

Left anterior descending coronary artery. ### Explanation **1. Why Left Anterior Descending (LAD) is Correct:** The **Left Anterior Descending (LAD) artery** is the most common site for clinically significant atherosclerosis and occlusion. This is primarily due to hemodynamic factors; the LAD experiences high wall stress and turbulent flow at its bifurcation from the Left Main coronary artery. It supplies the majority of the left ventricular myocardium (apex, anterior wall, and anterior 2/3rd of the interventricular septum). Because of its critical role and high frequency of occlusion, it is famously nicknamed the **"Widow Maker."** **2. Analysis of Incorrect Options:** * **Right Coronary Artery (RCA):** While frequently involved in atherosclerosis (the second most common site), it is statistically less common than the LAD. RCA occlusion typically leads to inferior wall MIs. * **Left Circumflex (LCx) Artery:** This is generally the third most common site for atherosclerotic changes. It supplies the lateral wall of the left ventricle. * **Left Main Coronary Artery (LMCA):** While atherosclerosis here is the most dangerous (as it compromises both the LAD and LCx), isolated or primary atherosclerotic narrowing of the LMCA is less frequent than in its distal branches. **3. NEET-PG High-Yield Pearls:** * **Frequency Hierarchy:** LAD > RCA > LCx. * **Anatomical Landmark:** The LAD travels in the anterior interventricular groove. * **ECG Correlation:** Occlusion of the LAD typically presents as ST-elevation in leads **V1–V4**. * **Blood Supply:** The LAD provides the primary blood supply to the **Bundle of His** and bundle branches; thus, LAD infarcts are often associated with new-onset bundle branch blocks.

Question 1

Severe hypertension is defined if systolic BP is greater than:

Accepted Answer

180 mmHg

Answer

140 mmHg

Answer

160 mmHg

Answer

200 mmHg

Question 2

In the JVP tracing, which condition is characterized by the absence of 'a' waves?

Accepted Answer

Atrial fibrillation

Answer

Mitral stenosis

Answer

Tricuspid atresia

Answer

Myocardial infarction

Question 3

A 45-year-old woman presents with increasing shortness of breath on exertion and fatigue. Physical examination reveals a loud systolic ejection murmur best heard at the left sternal border, which increases with standing. A double apical impulse is also noted. What is the most likely diagnosis for this patient presenting with a systolic murmur?

Accepted Answer

Hypertrophic obstructive cardiomyopathy (HOCM)

Answer

Aortic stenosis

Answer

Mitral regurgitation (chronic)

Answer

Tricuspid regurgitation

Question 4

Which drugs are involved in the bradycardia algorithm?

Accepted Answer

Atropine, Dopamine, Epinephrine

Answer

Atropine, Norepinephrine, Dopamine

Answer

Atropine, Isoproterenol, Norepinephrine

Answer

Atropine, Dobutamine, Amiodarone

Question 5

A patient presents with angina, dyspnea, and syncope. What is the most likely diagnosis?

Accepted Answer

Aortic stenosis

Answer

Aortic regurgitation

Answer

Atrial septal defect

Answer

Ventricular septal defect

Question 6

A 26-year-old man complains of abdominal distension, swelling of the legs, and easy fatigability. His blood pressure is 90/70 mm Hg and pulse becomes difficult to feel on deep inspiration. JVP is grossly elevated and rises further on deep inspiration. He has pedal edema, ascites, and tender hepatomegaly. The precordium is quiet with a loud and somewhat early third heart sound. What is the probable diagnosis?

Accepted Answer

Constrictive pericarditis

Answer

Cor Pulmonale

Answer

Tricuspid stenosis

Answer

Pulmonary stenosis

Question 7

Why is chemical cardioversion considered for patients with recurrent episodes of atrial fibrillation?

Accepted Answer

It can be done electively without sedation.

Answer

It does not change the rhythm but improves the rate.

Answer

It prevents the formation of a clot in the atrium.

Answer

It is more effective than electrical cardioversion.

Question 8

Which of the following features is characteristic of constrictive pericarditis, helping to differentiate it from restrictive cardiomyopathy?

Accepted Answer

Thickened pericardium is present

Answer

Diastolic pressures are not equalized

Answer

Mild pericardial effusion is present

Answer

Associated with septal hypertrophy

Question 9

A 60-year-old female presented to the ER with chest pain and dyspnea, along with palpitations, nausea, vomiting, and a few episodes of syncope. MI was suspected. ECG and lab findings revealed raised cardiac enzymes. ECHO was also done. The patient was planned for coronary angiography, but no coronary artery stenosis was observed. What is the drug of choice for the above condition?

Accepted Answer

Propranolol

Answer

Streptokinase

Answer

Aspirin

Answer

Rosuvastatin

Question 10

Which of the following arteries is most common to undergo atherosclerotic changes leading to coronary artery disease?

Accepted Answer

Left anterior descending coronary artery

Answer

Right coronary artery

Answer

Left circumflex coronary artery

Answer

Left main coronary artery

Cardiology — MCQs

Cardiology — MCQs

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