Cardiology — MCQs

Cardiology Indian Medical PG Practice Questions and MCQs

Question 1431: Which of the following clinical findings indicates effective management of an acute myocardial infarction?

A. Relief of chest pain (Correct Answer)
B. Normalization of ECG changes
C. Improvement in echocardiographic motion of myocardium
D. All of the options

Explanation: ***Relief of chest pain*** - The primary clinical symptom of acute myocardial infarction is **chest pain**, and its resolution is a direct indicator of successful management and myocardial reperfusion [2]. - While other findings confirm resolution, the patient's subjective relief of pain is an immediate and crucial sign of **improved myocardial oxygen supply** [4]. *Normalization of ECG changes* - While **normalization of ECG changes**, particularly resolution of ST-segment elevation, is a strong indicator of successful reperfusion, it is an objective, rather than purely clinical, finding [3]. - ECG changes may take time to fully normalize even after successful reperfusion, and some residual changes may persist, making it a less immediate clinical indicator than pain relief. *Improvement in echocardiographic motion of myocardium* - **Improvement in echocardiographic motion of the myocardium** is an objective measure indicating restored function and is crucial for assessing long-term myocardial recovery [1]. - However, this is not an immediate clinical finding and typically lags behind acute symptom resolution, requiring specialized imaging. *All of the options* - While all listed options indicate effective management, the question asks for a **clinical finding** that *indicates* effective management, and **relief of chest pain** is the most direct and immediate clinical symptom improvement. - The other options are more objective and delayed indicators rather than immediate clinical signs of improvement.

Question 1432: A patient with acute chest pain and diaphoresis is suspected of having a myocardial infarction. What is the first-line diagnostic test to confirm the diagnosis?

A. Echocardiogram
B. Chest X-ray
C. Serum troponin
D. Electrocardiogram (Correct Answer)

Explanation: ***Electrocardiogram*** - An **ECG** is the **first-line diagnostic test** for suspected myocardial infarction because it can rapidly identify **ST-segment elevations** [1] or other ischemic changes indicative of acute myocardial injury. - It provides immediate information about electrical activity in the heart, helping to determine the need for urgent reperfusion therapy. *Echocardiogram* - While an **echocardiogram** can assess **cardiac function** and identify **wall motion abnormalities** [2], it is not the primary diagnostic test for an acute MI in the emergency setting. - It is typically used as a follow-up or adjunctive test to evaluate the extent of damage and assess prognosis. *Chest X-ray* - A **chest X-ray** is helpful for ruling out other causes of chest pain, such as **pneumonia**, **pneumothorax**, or **aortic dissection**. - However, it does not directly diagnose a **myocardial infarction** as it does not show ischemic changes in the heart. *Serum troponin* - **Serum troponin** levels are the **gold standard biochemical marker** for myocardial necrosis, but they typically **rise several hours after the onset of symptoms** [2]. - While essential for confirming the diagnosis, it is not the immediate first-line test for initial assessment and triage of acute chest pain.

Question 1433: A patient with advanced heart failure and a left ventricular ejection fraction of 20% is most likely to benefit from which device?

A. Automated external defibrillator
B. Permanent pacemaker
C. Implantable cardioverter-defibrillator (Correct Answer)
D. Ventricular assist device

Explanation: ### Implantable cardioverter-defibrillator - Patients with a **left ventricular ejection fraction (LVEF) ≤ 35%** due to heart failure are at significantly increased risk of **sudden cardiac death** from ventricular arrhythmias. - An **ICD** is designed to detect and defibrillate life-threatening ventricular tachyarrhythmias, acting as both primary and secondary prevention against sudden cardiac arrest. *Automated external defibrillator* - While an **AED** can deliver a defibrillation shock, it is an external device used for emergency situations outside of a hospital setting and does not provide continuous monitoring or therapy. - It does not offer the ongoing protection or **resynchronization therapy** that an ICD might provide for high-risk patients. *Permanent pacemaker* - A **permanent pacemaker** is primarily indicated for patients with symptomatic bradycardia or certain conduction disorders (e.g., AV block) to regulate heart rhythm [2]. - It does not address the risk of **ventricular tachyarrhythmias** or provide defibrillation capabilities for patients with severely reduced LVEF. *Ventricular assist device* - A **VAD** is indicated for patients with **end-stage heart failure** as a bridge to transplant, destination therapy, or bridge to recovery, to support cardiac output [1]. - While it improves hemodynamics, it does not directly prevent or treat life-threatening ventricular arrhythmias, which remain a significant risk in patients with severely impaired LVEF [1].

Question 1434: A 55-year-old man presents with chest pain radiating to the left arm and shortness of breath. An ECG shows ST-segment elevation. What is the most appropriate initial treatment?

A. Aspirin and nitroglycerin
B. Beta-blockers
C. Angioplasty (Correct Answer)
D. Thrombolytic therapy

Explanation: ***Angioplasty*** - The presence of **ST-segment elevation** on ECG in a patient with chest pain radiating to the left arm and shortness of breath indicates an **ST-segment elevation myocardial infarction (STEMI)** [3]. - **Primary percutaneous coronary intervention (PCI)**, which includes angioplasty and stenting, is the preferred initial treatment for STEMI when available within recommended timeframes, as it achieves effective reperfusion by mechanically opening the occluded coronary artery [2]. *Aspirin and nitroglycerin* - While **aspirin** is crucial for its antiplatelet effect and **nitroglycerin** can help with pain and vasodilation, these are adjunctive therapies. - They do not address the underlying coronary artery occlusion as definitively as reperfusion therapy (angioplasty or thrombolysis) in STEMI. *Beta-blockers* - **Beta-blockers** are important for reducing myocardial oxygen demand and preventing arrhythmias, but they are typically started after initial stabilization and reperfusion [1]. - They are not the immediate priority for opening an acutely occluded artery in STEMI [4]. *Thrombolytic therapy* - **Thrombolytic therapy** is an alternative reperfusion strategy for STEMI when primary PCI is not available or cannot be performed within the recommended time window [2]. - However, **primary PCI (angioplasty)** is generally preferred over thrombolysis due to its superior efficacy and lower risk of complications if performed promptly by an experienced team [2].

Question 1435: A 55-year-old male with hypertension presents with sudden severe chest pain radiating to the back, blood pressure of 90/60, and a new diastolic murmur. What is the first diagnostic test?

A. Electrocardiogram
B. Chest X-ray
C. Computed tomography angiography (Correct Answer)
D. Transthoracic echocardiography

Explanation: ***Computed tomography angiography*** - **CT angiography** is the **most rapid and accurate** imaging modality for diagnosing aortic dissection, especially in hemodynamically stable patients. - It provides detailed visualization of the **aorta's lumen**, allowing for identification of intimal tears, false lumens, and involvement of branch vessels [1]. *Electrocardiogram* - An **ECG** is a crucial initial test for evaluating chest pain to rule out myocardial infarction but **cannot diagnose aortic dissection**. - While it may show **non-specific changes** or signs of ischemia if coronary arteries are involved, it does not directly visualize the aorta [1]. *Chest X-ray* - A **chest X-ray** is a quick initial test that may show a **widened mediastinum** or pleural effusion, suggestive of aortic pathology. - However, these findings are **non-specific** and require further confirmation with more definitive imaging for an accurate diagnosis of aortic dissection. *Transthoracic echocardiography* - **Transthoracic echocardiography (TTE)** can visualize the proximal aorta and may detect an intimal flap or pericardial effusion. - However, its **sensitivity for distal aortic dissection is limited** due to acoustic window limitations, making CTA a superior first-line test for definitive diagnosis.

Question 1436: A 30-year-old male presents with digital infarcts involving the 2nd and 3rd fingers on the right side and the 5th finger on the left side. His blood pressure is 160/140 mm Hg. What is the likely diagnosis?

A. Takayasu arteritis
B. Buerger's disease
C. Polyarteritis nodosa
D. Systemic sclerosis (Correct Answer)

Explanation: ***Systemic sclerosis*** - **Scleroderma renal crisis** can cause very high blood pressures like 160/140 mmHg and lead to **digital infarcts** due to vasculopathy [1]. - The patient's age and widespread digital infarcts are also consistent with the microvascular involvement seen in systemic sclerosis [1]. *Polyarteritis nodosa* - This is a **necrotizing vasculitis** of medium-sized arteries, often causing **abdominal pain**, **neuropathy**, and **renal involvement**, but digital infarcts are less typical than in scleroderma [1]. - While it can cause hypertension, the severity and pattern of digital infarcts are less characteristic when compared to scleroderma renal crisis. *Takayasu arteritis* - This is a **large-vessel vasculitis** primarily affecting the aorta and its major branches, leading to **claudication**, **pulse deficits**, and **hypertension**. - Digital infarcts are not a common feature of Takayasu arteritis, as it mainly affects larger vessels, not typically the small digital arteries. *Buerger's disease* - Primarily affects **small and medium-sized arteries and veins** in the extremities, almost exclusively in **heavy smokers**, leading to **digital ischemia** and excruciating pain. - While it causes digital infarcts, the extreme hypertension described (160/140 mmHg) is not a typical feature of Buerger's disease, which is more localized.

Question 1437: A patient is diagnosed with aortic stenosis. Which heart valve is involved?

A. Mitral valve
B. Tricuspid valve
C. Pulmonary valve
D. Aortic valve (Correct Answer)

Explanation: ***Aortic valve*** - **Aortic stenosis** specifically refers to the narrowing or stiffening of the **aortic valve**, impeding blood flow from the left ventricle to the aorta [2], [3]. - The name of the condition directly indicates the affected valve. *Mitral valve* - The **mitral valve** is located between the left atrium and left ventricle; its stenosis is called **mitral stenosis** [1]. - Dysfunction of the mitral valve leads to symptoms related to pulmonary congestion [1]. *Tricuspid valve* - The **tricuspid valve** separates the right atrium and right ventricle, and its stenosis is known as **tricuspid stenosis**. - Issues with this valve primarily affect systemic venous circulation. *Pulmonary valve* - The **pulmonary valve** lies between the right ventricle and the pulmonary artery; its narrowing is termed **pulmonary stenosis**. - Pulmonary valve conditions affect blood flow to the lungs.

Question 1438: A 72-year-old man with a history of hypertension and smoking presents with a sudden onset of severe back pain. His vital signs indicate hypotension and tachycardia. What is the most likely diagnosis?

A. Acute pancreatitis
B. Abdominal aortic aneurysm rupture (Correct Answer)
C. Myocardial infarction
D. Pulmonary embolism

Explanation: ***Abdominal aortic aneurysm rupture*** - The sudden onset of **severe back pain** in an elderly patient with risk factors like **hypertension** and **smoking**, along with signs of **hemodynamic instability** (hypotension and tachycardia), is highly suggestive of an abdominal aortic aneurysm (AAA) rupture [1]. - A ruptured AAA involves bleeding into the retroperitoneal space, causing pain and rapid blood loss, leading to shock. *Acute pancreatitis* - While acute pancreatitis can cause severe back pain, it is typically accompanied by **epigastric abdominal pain**, nausea, and vomiting, often radiating to the back [2]. - **Hypotension** and **tachycardia** can occur in severe pancreatitis due to systemic inflammatory response, but a history of hypertension and smoking leading to sudden onset severe back pain points away from pancreatitis as the primary diagnosis without other typical symptoms [2]. *Myocardial infarction* - A myocardial infarction (MI) is characterized by **chest pain**, which may radiate to the jaw, arm, or back, and can also present with **hypotension** and **tachycardia** [3]. - However, the primary symptom being **severe back pain** without mention of chest pain makes MI less likely the most probable diagnosis compared to AAA rupture. *Pulmonary embolism* - Pulmonary embolism (PE) typically presents with **sudden onset dyspnea**, **pleuritic chest pain**, and sometimes hemoptysis. - While **tachycardia** and **hypotension** can occur in massive PE, the primary symptom of severe back pain without respiratory distress makes PE a less likely diagnosis.

Question 1439: What is the clinical significance of measuring troponin I levels in a patient suspected of having a myocardial infarction?

A. It indicates kidney function
B. It helps diagnose liver damage
C. It is a specific marker for cardiac muscle injury (Correct Answer)
D. It detects infections in the heart

Explanation: ***It is a specific marker for cardiac muscle injury*** - **Troponin I** is a protein found exclusively in cardiac muscle and is released into the bloodstream upon **myocardial cell damage**, making it highly specific for **cardiac muscle injury** [2]. - Elevated levels indicate **myocardial infarction** (heart attack) or other forms of acute coronary syndrome, even with subtle or atypical symptoms [2], [3]. *It indicates kidney function* - **Creatinine** and **blood urea nitrogen (BUN)** are primary markers for assessing **kidney function**, not troponin I. - While **renal impairment** can affect troponin levels due to reduced clearance, troponin I itself is not a direct measure of kidney function. *It helps diagnose liver damage* - **Liver transaminases** such as **ALT (alanine aminotransferase)** and **AST (aspartate aminotransferase)** are used to diagnose **liver damage** [1]. - Elevated troponin I levels are not associated with **hepatic injury** [1]. *It detects infections in the heart* - **Troponin I** primarily indicates **myocardial cell necrosis**, not the presence of **infections** in the heart (e.g., endocarditis, myocarditis) [2]. - **Infections** are typically diagnosed through **blood cultures**, **inflammatory markers** (like CRP), or specific imaging studies.

Question 1440: A 65-year-old woman with a history of atrial fibrillation presents with sudden abdominal pain and vomiting. CT angiography reveals a thrombus in the superior mesenteric artery. What is the most appropriate initial management?

A. Surgical embolectomy
B. Observation and supportive care
C. Anticoagulation with heparin
D. Endovascular thrombectomy (Correct Answer)

Explanation: ***Endovascular thrombectomy*** - This procedure directly removes the **thrombus** from the **superior mesenteric artery**, restoring blood flow to the bowel, which is crucial in cases of acute mesenteric ischemia confirmed by imaging. [1] - Due to the **sudden onset** and **severe symptoms** (abdominal pain, vomiting) in a patient with a high-risk factor (atrial fibrillation), prompt revascularization is necessary to prevent **bowel infarction**. *Anticoagulation with heparin* - While anticoagulation with heparin is often initiated in acute mesenteric ischemia to prevent further clot formation, it is **not sufficient** as a sole initial treatment for an existing, symptomatic arterial thrombus causing acute ischemia. [1] - Heparin does not dissolve the existing clot effectively enough to immediately restore blood flow and prevent **bowel necrosis**. *Surgical embolectomy* - **Surgical embolectomy** is an option for mesenteric ischemia, but **endovascular approaches** are often preferred as the initial management due to being less invasive, especially in patients who may be at higher surgical risk. [1] - It involves an **open surgical procedure** to remove the clot, which carries greater risks and recovery time compared to endovascular options. *Observation and supportive care* - **Observation and supportive care** alone are entirely inappropriate for acute mesenteric ischemia caused by an arterial thrombus, as this condition is a **surgical emergency** that rapidly leads to bowel infarction and death if left untreated. [1] - Delaying definitive treatment will result in irreversible **ischemic bowel damage**, **sepsis**, and multi-organ failure.

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Coronary Artery Disease and Angina

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Acute Coronary Syndromes

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Cardiac Arrhythmias

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Cardiomyopathies

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Congenital Heart Disease in Adults

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Hypertension and Hypertensive Emergencies

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Cardiology — MCQs

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