Cardiology — MCQs
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Which of the following clinical findings indicates effective management of an acute myocardial infarction?
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 patient with advanced heart failure and a left ventricular ejection fraction of 20% is most likely to benefit from which device?
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 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 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 patient is diagnosed with aortic stenosis. Which heart valve is involved?
What is the clinical significance of measuring troponin I levels in a patient suspected of having a myocardial infarction?
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 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?
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: 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 1439: 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.
Question 1440: 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.
Practice by Chapter
Coronary Artery Disease and Angina
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Acute Coronary Syndromes
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Heart Failure
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Cardiac Arrhythmias
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Valvular Heart Diseases
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Cardiomyopathies
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Pericardial Diseases
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Congenital Heart Disease in Adults
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Hypertension and Hypertensive Emergencies
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Pulmonary Hypertension
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Non-invasive Cardiac Diagnostics
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Preventive Cardiology
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