Cardiology Practice Questions

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.

Q: Which of the following conditions is characterized by an early diastolic murmur?

Aortic Regurgitation (AR). **Explanation** **Correct Answer: C. Aortic Regurgitation (AR)** The hallmark of Aortic Regurgitation is a high-pitched, blowing **Early Diastolic Murmur (EDM)** [1]. This occurs because, immediately after the closure of the semilunar valves (S2), the pressure in the aorta significantly exceeds the pressure in the left ventricle [2]. This pressure gradient causes blood to regurgitate back into the ventricle at the very beginning of diastole. It is best heard at the left sternal border (Erb’s point) with the patient sitting forward and in deep expiration [2]. **Analysis of Incorrect Options:** * **A. Ventricular Septal Defect (VSD):** Characterized by a loud, harsh **Pansystolic (Holosystolic) murmur**, loudest at the left lower sternal border. * **B. Atrial Septal Defect (ASD):** Does not produce a murmur across the defect itself. Instead, it causes a **Mid-systolic flow murmur** over the pulmonary area due to increased stroke volume across the pulmonary valve, along with a characteristic **fixed split S2** [1]. * **D. Pulmonic Regurgitation (PR):** While PR can cause an EDM (Graham Steell murmur), it is typically associated with pulmonary hypertension. In the context of standard NEET-PG questions, AR is the classic and most common cause of an EDM [2]. Note: Severe PR without pulmonary hypertension usually produces a *mid-diastolic* murmur. **NEET-PG High-Yield Pearls:** * **Austin Flint Murmur:** A mid-diastolic rumble heard in severe AR due to the regurgitant jet displacing the mitral valve leaflet [2]. * **Peripheral Signs of AR:** Look for "Water-hammer pulse" (Corrigan’s pulse), Quincke’s sign (capillary pulsations), and de Musset’s sign (head nodding). * **Dynamic Maneuvers:** Left-sided murmurs (AR, MR, AS) increase in intensity with **expiration**, while right-sided murmurs increase with **inspiration** (Carvallo's sign).

Q: Water hammer pulse is also known as:

Corrigan's pulse. **Explanation:** **Corrigan’s pulse** (Water hammer pulse) is a classic clinical finding in **Aortic Regurgitation (AR)** [1]. It is characterized by a rapid, forceful upstroke (due to increased stroke volume) followed by a sudden, rapid collapse (due to backflow of blood into the left ventricle and runoff into the periphery) [1]. It is best palpated at the radial artery with the patient's arm elevated. **Analysis of Incorrect Options:** * **Duroziez’s sign:** This refers to a double murmur (systolic and diastolic) heard over the **femoral artery** when it is compressed with a stethoscope. * **Traube’s sign:** Also known as "pistol-shot sounds," these are booming systolic and diastolic sounds heard over the **femoral artery**. * **Quincke’s sign:** This refers to rhythmic **capillary pulsations** visible in the nail beds when light pressure is applied. **Clinical Pearls for NEET-PG:** * **Pathophysiology:** All these signs are manifestations of a **wide pulse pressure**, which is the hallmark of chronic severe Aortic Regurgitation [2]. * **De Musset’s sign:** Rhythmic head nodding in sync with the heartbeat [1]. * **Müller’s sign:** Systolic pulsations of the uvula. * **Hill’s sign:** The most sensitive sign for AR; it is defined as a popliteal systolic blood pressure exceeding brachial systolic blood pressure by >20 mmHg (severe AR if >60 mmHg). * **Bisferiens Pulse:** A "double-peaked" pulse seen in AR combined with Aortic Stenosis or in HOCM.

Q: A patient presents to the emergency department in an unconscious state after a 15-minute delay following a call. The patient has a barely palpable radial pulse and no signs of trauma. The systolic blood pressure is 58 mm Hg. An ECG and ultrasound film are shown. Which electrolyte abnormality is most likely to cause this clinical scenario?

Hyperkalemia. ***Hyperkalemia*** - **Severe hyperkalemia** (>6.5 mEq/L) causes **cardiac conduction abnormalities** leading to **bradycardia**, **hypotension**, and potential **cardiac arrest**, explaining the unconscious state and barely palpable pulse. - ECG findings progress from **peaked T waves** to **wide QRS complexes** to **sine wave pattern** and ultimately **asystole**; ultrasound may show **hypokinetic** or **dilated heart** with poor contractility. *Hypokalemia* - Typically causes **muscle weakness** and **paralysis** but rarely leads to such severe **hemodynamic collapse** with unconsciousness. - ECG shows **flattened T waves**, **U waves**, and **prolonged QT interval**, not the pattern typically associated with cardiac arrest. *Hypocalcemia* - Primarily causes **neuromuscular irritability** with **tetany**, **seizures**, and **laryngospasm** rather than severe cardiovascular collapse. - ECG findings include **prolonged QT interval** and **T wave inversions**, but rarely cause hemodynamic instability severe enough for unconsciousness. *Hypercalcemia* - Usually presents with **"stones, bones, groans, and psychiatric overtones"** including **kidney stones**, **bone pain**, and **confusion**. - ECG shows **shortened QT interval** and rarely causes acute cardiovascular collapse leading to unconsciousness and severe hypotension.

Q: In Myocardial infarction, what is the most specific marker?

Troponin T. The diagnosis of Myocardial Infarction (MI) relies on the detection of a rise and/or fall of cardiac biomarkers, with **Cardiac Troponins (I and T)** being the preferred markers due to their high **myocardial specificity** and sensitivity [1]. **Why Troponin T is the Correct Answer:** Troponins are structural proteins of the cardiac myofibrils. Unlike other enzymes, Troponin I and T have isoforms that are unique to cardiac myocytes. They are released into the bloodstream following even minute areas of myocardial necrosis [1]. Troponin T begins to rise within 3–6 hours of injury and can remain elevated for up to 10–14 days, providing a wide diagnostic window. **Analysis of Incorrect Options:** * **Pro-BNP:** This is a marker of ventricular wall stretch and is primarily used for the diagnosis and prognosis of **Heart Failure**, not for identifying acute necrosis. * **Myoglobin:** This is the **earliest marker** to rise (within 1–2 hours). However, it lacks specificity because it is also found in skeletal muscle and can be elevated due to trauma or strenuous exercise. * **CPK-MB:** While specific to the heart, it is less specific than Troponins [1]. Its primary utility is in detecting **re-infarction** because it returns to baseline quickly (within 48–72 hours), whereas Troponins stay elevated longer. **NEET-PG High-Yield Pearls:** * **Most Specific Marker:** Troponin I (slightly more specific than T in patients with renal failure). * **Earliest Marker:** Myoglobin. * **Marker for Re-infarction:** CPK-MB. * **Gold Standard for Diagnosis:** Cardiac Troponins [1]. * **Bedside Test:** Troponin T (Rapid immunochromatographic test).

Q: What is true about pulsus paradoxus?

Seen in pericardial tamponade.. **Explanation:** **Pulsus paradoxus** is defined as an exaggerated fall in systolic blood pressure (>10 mmHg) during inspiration. Under normal physiological conditions, inspiration increases venous return to the right heart, causing the interventricular septum to bulge slightly into the left ventricle (LV). In conditions like **cardiac tamponade**, the heart is compressed within a fixed space by fluid. The increased right-sided filling during inspiration forces the septum to shift significantly toward the left, further reducing LV filling and stroke volume, leading to the characteristic drop in blood pressure. **Analysis of Options:** * **Option C (Correct):** Pericardial tamponade is the classic cause. Other causes include severe asthma, COPD, and constrictive pericarditis (though less common than in tamponade). * **Option A:** Arm-tongue circulation time is a measure of blood flow velocity (prolonged in heart failure). It is not a diagnostic feature or a physiological component of pulsus paradoxus. * **Option B:** Stroke volume actually **decreases** during inspiration in pulsus paradoxus, leading to the drop in systolic pressure. * **Option D:** In severe left ventricular failure, pulsus paradoxus is typically **absent**. In fact, LV failure can sometimes cause "reversed pulsus paradoxus" (seen in HOCM or IPPV). **High-Yield Clinical Pearls for NEET-PG:** * **Kussmaul’s Sign vs. Pulsus Paradoxus:** Kussmaul’s sign (rise in JVP on inspiration) is classic for **Constrictive Pericarditis**, whereas Pulsus Paradoxus is classic for **Cardiac Tamponade**. * **Reverse Pulsus Paradoxus:** Seen in Hypertrophic Obstructive Cardiomyopathy (HOCM) and patients on positive pressure ventilation. * **Exception:** Pulsus paradoxus may be absent in tamponade if there is co-existing ASD or Aortic Regurgitation.

Question 1

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 2

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

Question 3

Which of the following conditions is characterized by an early diastolic murmur?

Accepted Answer

Aortic Regurgitation (AR)

Answer

Ventricular Septal Defect (VSD)

Answer

Atrial Septal Defect (ASD)

Answer

Pulmonic Regurgitation (Severe)

Question 4

Water hammer pulse is also known as:

Accepted Answer

Corrigan's pulse

Answer

Duroziez pulse

Answer

Traube's sign

Answer

Quincke pulsation

Question 5

All of the following factors predispose to Aortic dissection, EXCEPT:

Accepted Answer

First-trimester pregnancy

Answer

Systemic hypertension

Answer

Coarctation of aorta

Answer

Takayasu's arteritis

Question 6

A patient presents to the emergency department in an unconscious state after a 15-minute delay following a call. The patient has a barely palpable radial pulse and no signs of trauma. The systolic blood pressure is 58 mm Hg. An ECG and ultrasound film are shown. Which electrolyte abnormality is most likely to cause this clinical scenario?

Accepted Answer

Hyperkalemia

Answer

Hypokalemia

Answer

Hypocalcemia

Answer

Hypercalcemia

Question 7

Low renin hypertension is seen in all of the following conditions, except:

Accepted Answer

Renovascular hypertension

Answer

Essential hypertension

Answer

Conn's syndrome

Answer

Liddle's syndrome

Question 8

Acute aortic regurgitation is seen in all the following conditions except?

Accepted Answer

Acute myocardial infarction

Answer

Marfan's syndrome

Answer

Bacterial endocarditis

Answer

Ankylosing spondylitis

Question 9

In Myocardial infarction, what is the most specific marker?

Accepted Answer

Troponin T

Answer

Pro-Brain Natriuretic Peptide

Answer

Myoglobin

Answer

Creatine Phosphokinase MB (CPK MB)

Question 10

What is true about pulsus paradoxus?

Accepted Answer

Seen in pericardial tamponade.

Answer

Arm-tongue circulation time is increased.

Answer

T Stroke volume.

Answer

Seen in severe left ventricular heart failure.

Cardiology — MCQs

Cardiology — MCQs

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