Cardiology Practice Questions

Q: Which of the following risk factors is most strongly associated with the development of embolic stroke in atrial fibrillation?

Previous stroke. ***Previous stroke*** - A history of **prior ischemic stroke or transient ischemic attack (TIA)** is the strongest independent predictor of future embolic stroke in patients with **atrial fibrillation (AF)**. - This risk factor is weighted heavily in stroke risk stratification scores like **CHA2DS2-VASc** (2 points for previous stroke/TIA). *Hypertension* - **Hypertension** is a significant risk factor for stroke in general and contributes to cardiovascular morbidity. - However, its association with *embolic stroke specifically in the context of AF* is less potent compared to a **prior stroke**. *Diabetes mellitus* - **Diabetes mellitus** increases the overall risk of stroke and is an important cardiovascular risk factor. - While it contributes to the risk of stroke in AF, its predictive power for *embolic stroke* is secondary to a **previous thrombotic event**. *Coronary artery disease* - **Coronary artery disease (CAD)** often coexists with AF and shares common risk factors, contributing to overall cardiovascular risk. - While CAD indicates systemic vascular disease, it is **not as direct a predictor** of *embolic stroke from AF* as a previous embolic event.

Q: A 65-year-old man presents with palpitations and is found to have atrial fibrillation. What is the primary goal of therapy for this patient?

Anticoagulation. ***Anticoagulation*** - The primary goal in a patient with new-onset atrial fibrillation is to prevent **thromboembolic events**, particularly **stroke**, which can be devastating. [1] - While rate and rhythm control are important, addressing the **risk of clot formation** in the atria due to the irregular rhythm is the most immediate and critical priority for patient safety. [1] *Rate control* - This strategy aims to **slow the ventricular response** to atrial fibrillation to a more physiological rate, typically reducing symptoms like palpitations and improving cardiac output. [1] - While important for symptom management and preventing **tachycardia-induced cardiomyopathy**, it does not directly address the increased risk of stroke. [1] *Rhythm control* - This approach aims to restore and maintain **normal sinus rhythm**, which can alleviate symptoms and potentially improve cardiac function. [1] - While desirable, rhythm control carries its own risks (e.g., from antiarrhythmic drugs or procedures) and has not consistently shown superior outcomes over rate control in preventing stroke when adequate anticoagulation is used. *Cardioversion* - This procedure uses an electrical shock or medication to **convert atrial fibrillation back to normal sinus rhythm**. - While sometimes necessary, particularly in hemodynamically unstable patients, it is often performed after a period of anticoagulation to reduce the risk of thromboembolic events associated with the conversion process itself.

Q: A patient presents with acute myocardial infarction and a history of severe chest pain. Which anatomical area of the heart is most commonly affected in such cases?

Left ventricle. Left ventricle - The **left ventricle** has the largest muscle mass and performs the most work, making it particularly vulnerable to **ischemic injury** during myocardial infarction. - Due to the high **oxygen demand** and pressure workload, the left ventricle is the most common site of **myocardial infarction** [2]. *Right ventricle* - While the right ventricle can be affected, **right ventricular infarction** is less common and typically occurs secondary to **inferior wall myocardial infarction** affecting the left ventricle [1]. - Symptoms usually include **hypotension** and **jugular venous distention**, which are not universally present in all acute MIs. *Left atrium* - The **left atrium** primarily serves as a reservoir for blood and has a relatively small muscle mass, making isolated **left atrial infarction** extremely rare. - Infarction of the left atrium is usually asymptomatic and clinically insignificant compared to ventricular involvement. *Right atrium* - Similar to the left atrium, the **right atrium** has a small muscle mass and a lower metabolic demand, making it an uncommon site for infarction. - Isolated **right atrial infarction** is exceptionally rare and often found incidentally during autopsy in extensive myocardial infarctions.

Q: What is the most appropriate initial management for a 65-year-old male with ST-elevation myocardial infarction (STEMI) presenting with crushing chest pain and diaphoresis?

Immediate PCI to restore coronary perfusion. ***Immediate PCI to restore coronary perfusion*** - For **STEMI**, the primary goal is to **promptly restore blood flow** to the ischemic myocardium. **Primary percutaneous coronary intervention (PCI)** is the preferred reperfusion strategy, ideally performed within **90 minutes** of first medical contact [2]. - PCI directly opens the occluded coronary artery, significantly reducing **infarct size**, improving ventricular function, and lowering mortality [2]. *Thrombolysis followed by transfer for PCI* - **Thrombolysis** is an alternative when primary PCI is not available within recommended timelines (e.g., if transfer to a PCI-capable center would take too long) [2]. - However, if PCI is readily available, it is **superior to thrombolysis** due to higher rates of successful reperfusion and lower rates of reocclusion and bleeding complications [2]. *Delayed PCI after medical stabilization* - Delaying reperfusion therapy in STEMI is **contraindicated**, as **time is myocardium**. Rapid reperfusion is critical to preserve myocardial tissue and improve patient outcomes. - Medical stabilization alone without reperfusion therapy is insufficient to address the underlying occluded coronary artery. *Medical management with antiplatelets and anticoagulants* - **Antiplatelet (e.g., aspirin, P2Y12 inhibitors)** and **anticoagulant (e.g., heparin)** therapies are crucial adjuncts to reperfusion in STEMI, helping to prevent further clot formation and stabilize the plaque [2]. - However, these medications alone cannot effectively open a fully occluded artery characteristic of STEMI [1]; **mechanical reperfusion (PCI)** or **pharmacological reperfusion (thrombolysis)** is required.

Q: What is the primary concern for a patient with third-degree heart block?

Decreased heart rate. ***Decreased heart rate*** - In a **third-degree heart block**, there is a complete **disassociation between atrial and ventricular activity**, meaning no impulses from the atria reach the ventricles [2]. - The ventricles fire independently at a very slow escape rhythm (typically 20-40 bpm), leading to significant **bradycardia** and reduced cardiac output [1]. *Increased heart rate* - An increased heart rate, or **tachycardia**, is not characteristic of third-degree heart block [1]. - The block prevents rapid atrial impulses from being conducted to the ventricles. *Fluctuating heart rate* - While the heart rate can be variable with certain arrhythmias, a third-degree heart block typically presents with a **persistently slow and regular ventricular escape rhythm**, rather than wide fluctuations. - The heart rate is consistently low due to the complete block [1]. *Irregular heart rhythm* - Although there is **AV dissociation**, the ventricular rhythm in a third-degree heart block is often **regular but slow**, due to the consistent firing of an escape pacemaker [2]. - Increased irregularity might suggest a co-existing arrhythmia but is not the primary issue in complete heart block itself.

Q: A 50-year-old male with severe hypertension and a history of headaches presents for evaluation. Which physiological phenomenon is most likely increased in this patient?

Systemic vascular resistance. - Severe **hypertension** is primarily characterized by chronically elevated **systemic vascular resistance (SVR)**, reflecting constricted arterioles. [2] - This increased resistance forces the heart to pump harder, leading to higher blood pressure, which can cause symptoms like **headaches**. *Renal plasma flow* - In chronic severe hypertension, **renal arterioles** may constrict, leading to a **decrease** in renal plasma flow rather than an increase. [2] - Reduced renal plasma flow can contribute to kidney damage over time. *Capillary hydrostatic pressure* - While overall blood pressure is elevated, the **capillary hydrostatic pressure** specifically within the systemic capillary beds may not be uniformly or significantly increased across all tissues. [1] - Capillary pressure is more strongly influenced by local regulatory mechanisms and venular tone than by systemic arterial pressure in many cases. *Glomerular filtration rate* - Initially, the **glomerular filtration rate (GFR)** might be maintained through autoregulation, but in severe and prolonged hypertension, renal damage can lead to a **decrease** in GFR. - Sustained high pressures can damage the **glomeruli**, impairing their filtering capacity.

Q: Identify the primary drug used for pharmacological stress testing in echocardiography.

Dobutamine. ***Dobutamine*** - **Dobutamine** is a synthetic catecholamine that stimulates beta-1 adrenergic receptors, increasing **myocardial contractility** and **heart rate**, thereby mimicking the effects of exercise. - It is the most commonly used pharmacological agent for **stress echocardiography** to evaluate for inducible **myocardial ischemia**. *Adenosine* - **Adenosine** is primarily used for **pharmacological stress testing** in **myocardial perfusion imaging (MPI)**, not typically for echocardiography. - It causes **coronary vasodilation**, leading to increased blood flow in healthy vessels, while stenotic vessels cannot dilate, highlighting relative perfusion differences. *Atropine* - **Atropine** is an **anticholinergic drug** used to increase heart rate when the target heart rate is not achieved with dobutamine alone during stress echocardiography. - It is an **adjunct** or **secondary agent**, not the primary drug, for inducing stress. *Diltiazem* - **Diltiazem** is a **calcium channel blocker** used to treat **hypertension** and **angina**, typically decreasing heart rate and myocardial oxygen demand. - It is an **anti-ischemic drug** and would counteract the purpose of a **stress test**, which is to induce and unmask ischemia.

Q: A 62-year-old man with type 2 diabetes and a history of myocardial infarction is being treated for heart failure with reduced ejection fraction (HFrEF). According to the latest guidelines, which of the following medications should be added to optimize his treatment?

Sodium-glucose cotransporter-2 (SGLT2) inhibitor. ***Sodium-glucose cotransporter-2 (SGLT2) inhibitor*** * **SGLT2 inhibitors** are now recommended as a foundational therapy for HFrEF, regardless of diabetes status, due to their proven benefits in reducing **cardiovascular death** and **heart failure hospitalizations**. * In this patient with **type 2 diabetes** and **HFrEF**, an SGLT2 inhibitor would provide both glycemic control and significant cardiovascular protection. * *Sacubitril/valsartan* * **Sacubitril/valsartan** is a neprilysin inhibitor/angiotensin receptor blocker (ARNI) that is a cornerstone of HFrEF treatment, often replacing an **ACE inhibitor** or **ARB** [1]. * However, the question asks which medication *should be added* to *optimize* treatment, implying other foundational therapies might already be in place, and SGLT2 inhibitors offer an additional, distinct benefit. * *Ivabradine* * **Ivabradine** is indicated for HFrEF patients who are in **sinus rhythm** with a resting heart rate ≥ 70 bpm despite being on maximally tolerated doses of **beta-blockers**, to further reduce hospitalizations [1]. * The question does not provide information about his sinus rhythm or heart rate, or current beta-blocker status. * *Digoxin* * **Digoxin** may be considered in patients with HFrEF to reduce **heart failure hospitalizations**, particularly in those with **atrial fibrillation** or persistent symptoms despite optimal guideline-directed medical therapy [1]. * It does not improve survival in HFrEF and is generally reserved for patients who remain symptomatic after other foundational therapies.

Q: What is the most appropriate initial treatment for a 58-year-old female with a history of breast cancer who presents with pulmonary embolism?

Low Molecular Weight Heparin (LMWH). ***Low Molecular Weight Heparin (LMWH)*** - **LMWH** is the preferred initial treatment for **pulmonary embolism** in patients with **cancer** due to its superior efficacy in preventing recurrence and ease of administration. - It has a lower risk of bleeding compared to unfractionated heparin and is more effective than vitamin K antagonists in cancer-associated thrombosis [2]. [3] *Inferior Vena Cava (IVC) filter without anticoagulation* - An **IVC filter** is reserved for patients with absolute **contraindications to anticoagulation** or recurrent VTE despite adequate anticoagulation [2]. - It does not treat the existing clot or prevent new clot formation in the pulmonary circulation; it only prevents further embolization from the lower extremities. *Systemic thrombolysis for immediate treatment* - **Systemic thrombolysis** is indicated only for patients with **massive pulmonary embolism** presenting with **hemodynamic instability** due to a high risk of major bleeding [1]. - The patient's presentation does not suggest hemodynamic instability, making thrombolysis highly risky and unnecessary as an initial treatment [1]. *Oral anticoagulants as initial therapy* - While **oral anticoagulants** (e.g., DOACs or warfarin) are used for long-term management of PE, they are generally not suitable for **initial treatment** of acute PE, especially in cancer patients, as they have a slower onset of action or require bridging with parenteral anticoagulants [2]. - **LMWH** provides rapid and reliable anticoagulation, which is crucial in the acute phase of PE to prevent further clot propagation and embolization [3].

Q: A 72-year-old female presents with dyspnea on exertion and an ejection systolic murmur best heard at the right upper sternal border. Echocardiography reveals a calcified aortic valve with restricted movement. What is the most likely diagnosis?

Aortic stenosis. ***Aortic stenosis*** - The classic presentation of **dyspnea on exertion** and an **ejection systolic murmur** at the **right upper sternal border** in an elderly patient is highly suggestive of aortic stenosis [1]. - **Echocardiography demonstrating a calcified aortic valve with restricted movement** definitively confirms the diagnosis by showing the pathological changes to the valve [1]. *Mitral regurgitation* - Characterized by a **holosystolic murmur** best heard at the **apex** and radiating to the axilla, associated with conditions like papillary muscle dysfunction or leaflet prolapse [2]. - While it can cause dyspnea, the murmur's location and timing, along with the specific echo findings of a calcified aortic valve, differentiate it from the patient's presentation [2]. *Tricuspid regurgitation* - Presents with a **holosystolic murmur** that increases with inspiration (Carvallo's sign) and is best heard at the **left lower sternal border**, often associated with and secondary to pulmonary hypertension. - This condition does not typically involve a calcified aortic valve or an ejection systolic murmur at the right upper sternal border. *Ventricular septal defect* - Typically causes a **harsh holosystolic murmur** best heard at the **left sternal border**, often associated with a thrill, and is usually diagnosed earlier in life. - While it can lead to dyspnea, the specific murmur features and echocardiographic findings presented in an elderly patient are inconsistent with an isolated VSD.

Question 1

Which of the following risk factors is most strongly associated with the development of embolic stroke in atrial fibrillation?

Accepted Answer

Previous stroke

Answer

Hypertension

Answer

Diabetes mellitus

Answer

Coronary artery disease

Question 2

A 65-year-old man presents with palpitations and is found to have atrial fibrillation. What is the primary goal of therapy for this patient?

Accepted Answer

Anticoagulation

Answer

Rate control

Answer

Rhythm control

Answer

Cardioversion

Question 3

A patient presents with acute myocardial infarction and a history of severe chest pain. Which anatomical area of the heart is most commonly affected in such cases?

Accepted Answer

Left ventricle

Answer

Right ventricle

Answer

Left atrium

Answer

Right atrium

Question 4

What is the most appropriate initial management for a 65-year-old male with ST-elevation myocardial infarction (STEMI) presenting with crushing chest pain and diaphoresis?

Accepted Answer

Immediate PCI to restore coronary perfusion

Answer

Thrombolysis followed by transfer for PCI

Answer

Delayed PCI after medical stabilization

Answer

Medical management with antiplatelets and anticoagulants

Question 5

What is the primary concern for a patient with third-degree heart block?

Accepted Answer

Decreased heart rate

Answer

Increased heart rate

Answer

Fluctuating heart rate

Answer

Irregular heart rhythm

Question 6

A 50-year-old male with severe hypertension and a history of headaches presents for evaluation. Which physiological phenomenon is most likely increased in this patient?

Accepted Answer

Systemic vascular resistance

Answer

Renal plasma flow

Answer

Capillary hydrostatic pressure

Answer

Glomerular filtration rate

Question 7

Identify the primary drug used for pharmacological stress testing in echocardiography.

Accepted Answer

Dobutamine

Answer

Adenosine

Answer

Atropine

Answer

Diltiazem

Question 8

A 62-year-old man with type 2 diabetes and a history of myocardial infarction is being treated for heart failure with reduced ejection fraction (HFrEF). According to the latest guidelines, which of the following medications should be added to optimize his treatment?

Accepted Answer

Sodium-glucose cotransporter-2 (SGLT2) inhibitor

Answer

Sacubitril/valsartan

Answer

Ivabradine

Answer

Digoxin

Question 9

What is the most appropriate initial treatment for a 58-year-old female with a history of breast cancer who presents with pulmonary embolism?

Accepted Answer

Low Molecular Weight Heparin (LMWH)

Answer

Inferior Vena Cava (IVC) filter without anticoagulation

Answer

Systemic thrombolysis for immediate treatment

Answer

Oral anticoagulants as initial therapy

Question 10

A 72-year-old female presents with dyspnea on exertion and an ejection systolic murmur best heard at the right upper sternal border. Echocardiography reveals a calcified aortic valve with restricted movement. What is the most likely diagnosis?

Accepted Answer

Aortic stenosis

Answer

Mitral regurgitation

Answer

Tricuspid regurgitation

Answer

Ventricular septal defect

Cardiology — MCQs

Cardiology — MCQs

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