Cardiology Practice Questions

Q: In a patient with acute chest pain and elevated troponin, which of the following findings would most strongly suggest a diagnosis of myocardial infarction?

ST-segment elevation in leads II, III, and aVF. **ST-segment elevation in leads II, III, and aVF** - **ST-segment elevation** in contiguous leads is the hallmark of an **acute ST-elevation myocardial infarction (STEMI)**, indicating a **transmural injury** due to complete coronary artery occlusion [1], [2]. - Leads II, III, and aVF correspond to the **inferior wall** of the left ventricle, supplied by the **right coronary artery (RCA)** or, less commonly, the left circumflex artery [1]. *Symmetrical T-wave inversions in V1-V4* - **Symmetrical T-wave inversions** in precordial leads (V1-V4) are often seen in conditions like **ischemia**, **pulmonary embolism**, or **wellens' syndrome** (critical LAD stenosis), but not typically as the primary finding for acute MI [2]. - These findings indicate **myocardial ischemia** but not directly **infarction** in the same way as ST-elevation [2]. *ST-segment depression in leads V1-V3* - **ST-segment depression** in leads V1-V3 is often indicative of **posterior wall myocardial infarction**, but it is a reciprocal change and typically occurs in conjunction with ST-elevation in other leads (e.g., in posterior leads V7-V9) [2]. - While indicative of ischemia, it is not as strong a direct marker of acute infarction as ST-segment elevation [2]. *PR-segment depression in the limb leads* - **PR-segment depression** is a characteristic finding in **pericarditis**, due to inflammation of the atria, rather than myocardial infarction. - It is not an indicator of myocardial ischemia or infarction.

Q: A 65-year-old male with a history of hypertension and diabetes presents with new-onset heart failure symptoms. His ECG shows an atrial rate of 300 bpm and a ventricular rate of 150 bpm. What is the most appropriate treatment?

Electrical cardioversion. ### Electrical cardioversion - The patient presents with **new-onset heart failure symptoms** in the context of a rapid, irregularly irregular rhythm (implied by atrial rate of 300 bpm and ventricular rate of 150 bpm, suggesting **atrial fibrillation with rapid ventricular response**). [1] - Urgent **electrical cardioversion** is indicated for symptomatic atrial fibrillation, especially with signs of **hemodynamic instability** such as acute heart failure, to restore sinus rhythm promptly. [1] ### Beta-blockers - While beta-blockers are used for **rate control** in atrial fibrillation, they may worsen **acute decompensated heart failure** due to their negative inotropic effects. [1] - They are not the most appropriate initial treatment in a patient with new-onset heart failure symptoms and rapid ventricular response for rhythm conversion. [1] ### Calcium channel blockers - **Non-dihydropyridine calcium channel blockers** (e.g., diltiazem, verapamil) are used for rate control in atrial fibrillation but are **contraindicated** in patients with **heart failure with reduced ejection fraction** due to their negative inotropic effects. [1] - Their use could further compromise cardiac function in this patient presenting with new-onset heart failure. ### Amiodarone - **Amiodarone** is an antiarrhythmic drug used for rhythm control in atrial fibrillation, particularly in patients with structural heart disease or heart failure, and can be used for both acute and chronic management. - However, in the setting of acute symptomatic decompensated heart failure requiring urgent rhythm restoration, **electrical cardioversion** is generally preferred over pharmacological cardioversion with amiodarone for its rapid and more predictable effect.

Q: What is a major sign of rheumatic fever?

Joint pain. ***Joint pain*** - **Arthritis**, particularly **migratory polyarthritis** affecting large joints, is a common and major manifestation of **rheumatic fever**, often presenting with significant pain and inflammation. - The joint pain is typically acute, affects multiple joints sequentially, and responds well to anti-inflammatory medications. *Fever* - While **fever** is a common symptom of illness and can accompany **rheumatic fever**, it is a non-specific sign and not considered one of the **major diagnostic criteria** (Jones Criteria). - Many conditions can cause fever, making it less distinctive for specifically diagnosing rheumatic fever compared to more characteristic features like arthritis. *Myocarditis* - **Myocarditis** (carditis) is indeed a major manifestation of **rheumatic fever**, indicating inflammation of the heart muscle [1]. - However, the question asks for "a major sign," and while myocarditis is critical, **joint pain** (arthritis) is often the **most common and earliest presenting major symptom** that brings patients to medical attention. *Skin rash* - A characteristic **skin rash**, **erythema marginatum**, is one of the less common but major manifestations of **rheumatic fever**. - However, it is not as frequently observed or as consistently present as **arthritis** in patients with rheumatic fever.

Q: A 60-year-old male with a history of hypertension and diabetes presents with a sudden onset of severe back pain radiating to the abdomen. What is the most likely diagnosis?

Aortic dissection. ***Aortic dissection*** - Sudden onset of **severe, tearing back pain** radiating to the abdomen is a classic presentation of aortic dissection [1]. - The patient's history of **hypertension** is a significant risk factor for this life-threatening condition [1]. *Acute pancreatitis* - While acute pancreatitis can cause **severe back pain** and abdominal pain, it is typically associated with **epigastric tenderness**, nausea, and vomiting [2]. - The pain is usually described as **boring** and often relieved by leaning forward, unlike the tearing pain described here [2]. *Renal colic* - **Renal colic** presents with severe, colicky flank pain that may radiate to the groin, but it is typically not described as "tearing back pain radiating to the abdomen." - This condition is often associated with **hematuria** and symptoms of urinary tract obstruction. *Myocardial infarction* - Myocardial infarction typically causes **chest pain** that may radiate to the left arm, jaw, or back, but it is rarely described as primary severe back pain radiating to the abdomen. - While patients with diabetes may have atypical presentations, the sudden onset of **tearing pain** is more indicative of an aortic event.

Q: A 35-year-old man presents with palpitations, sweating, and anxiety. His ECG shows a regular, narrow QRS complex tachycardia at 180 bpm. Which specific vagal maneuver is the most appropriate to attempt first?

Valsalva maneuver. ***Valsalva maneuver*** - The **Valsalva maneuver** is a simple, non-invasive, and often effective first-line vagal maneuver for terminating **stable narrow QRS complex tachycardias**, such as **supraventricular tachycardia (SVT)** [2]. - It works by increasing intrathoracic pressure, stimulating the **vagus nerve**, and thereby slowing conduction through the **AV node**. *Ice water immersion (diving reflex)* - While effective in some cases, **ice water immersion** or the **diving reflex** can be cumbersome to administer in an emergency setting and is typically considered after less invasive maneuvers. - Its mechanism involves a sudden facial immersion in cold water, stimulating a powerful **vagal response**. *Synchronized cardioversion* - **Synchronized cardioversion** is an electrical procedure used for unstable patients or when vagal maneuvers and pharmacological interventions fail. - This patient is described as having palpitations, sweating, and anxiety, which generally indicates a **stable condition** not immediately requiring electrical cardioversion. *Carotid sinus massage* - **Carotid sinus massage** is a vagal maneuver that can be effective but requires careful execution due to the risk of **cerebrovascular events**, especially in older patients or those with **carotid artery disease** [1]. - It should be performed with caution and is often considered after the Valsalva maneuver.

Q: 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?

Electrocardiogram. ***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.

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

Relief of chest pain. ***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.

Q: 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?

Angioplasty. ***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].

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

Implantable cardioverter-defibrillator. ### 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].

Q: 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?

Computed tomography angiography. ***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 1

In a patient with acute chest pain and elevated troponin, which of the following findings would most strongly suggest a diagnosis of myocardial infarction?

Accepted Answer

ST-segment elevation in leads II, III, and aVF

Answer

Symmetrical T-wave inversions in V1-V4

Answer

ST-segment depression in leads V1-V3

Answer

PR-segment depression in the limb leads

Question 2

A 65-year-old male with a history of hypertension and diabetes presents with new-onset heart failure symptoms. His ECG shows an atrial rate of 300 bpm and a ventricular rate of 150 bpm. What is the most appropriate treatment?

Accepted Answer

Electrical cardioversion

Answer

Beta-blockers

Answer

Calcium channel blockers

Answer

Amiodarone

Question 3

What is a major sign of rheumatic fever?

Accepted Answer

Joint pain

Answer

Fever

Answer

Skin rash

Answer

Myocarditis

Question 4

A 60-year-old male with a history of hypertension and diabetes presents with a sudden onset of severe back pain radiating to the abdomen. What is the most likely diagnosis?

Accepted Answer

Aortic dissection

Answer

Acute pancreatitis

Answer

Renal colic

Answer

Myocardial infarction

Question 5

A 35-year-old man presents with palpitations, sweating, and anxiety. His ECG shows a regular, narrow QRS complex tachycardia at 180 bpm. Which specific vagal maneuver is the most appropriate to attempt first?

Accepted Answer

Valsalva maneuver

Answer

Ice water immersion (diving reflex)

Answer

Synchronized cardioversion

Answer

Carotid sinus massage

Question 6

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?

Accepted Answer

Electrocardiogram

Answer

Echocardiogram

Answer

Chest X-ray

Answer

Serum troponin

Question 7

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

Accepted Answer

Relief of chest pain

Answer

Normalization of ECG changes

Answer

Improvement in echocardiographic motion of myocardium

Answer

All of the options

Question 8

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?

Accepted Answer

Angioplasty

Answer

Aspirin and nitroglycerin

Answer

Beta-blockers

Answer

Thrombolytic therapy

Question 9

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

Accepted Answer

Implantable cardioverter-defibrillator

Answer

Automated external defibrillator

Answer

Permanent pacemaker

Answer

Ventricular assist device

Question 10

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?

Accepted Answer

Computed tomography angiography

Answer

Electrocardiogram

Answer

Chest X-ray

Answer

Transthoracic echocardiography

Cardiology — MCQs

Cardiology — MCQs

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