Cardiology Practice Questions

Q: A 55-year-old male presents with severe, crushing chest pain and shortness of breath. ECG shows ST elevation in the inferior leads. What is the most appropriate immediate management?

Percutaneous coronary intervention. Percutaneous coronary intervention - The patient's symptoms (severe, crushing chest pain, shortness of breath, ST elevation in inferior leads) are classic for an ST-elevation myocardial infarction (STEMI) [1]. - Primary percutaneous coronary intervention (PCI) is the preferred treatment for STEMI when available within recommended timeframes, as it directly opens the occluded coronary artery to restore blood flow [2]. Beta blockers - While beta blockers are part of long-term STEMI management, they are not the most appropriate immediate intervention when revascularization is paramount. - They can be administrated after reperfusion therapy, typically within 24 hours (unless contraindicated), to reduce myocardial oxygen demand [2]. Oxygen and nitroglycerin - Oxygen is indicated for hypoxia, but routine use in normoxia has not shown benefit; nitroglycerin can relieve chest pain but does not address the underlying coronary occlusion in STEMI. - These therapies are largely supportive and do not treat the root cause of STEMI, which is an occluded coronary artery [1]. Thrombolysis - Thrombolysis is an alternative reperfusion strategy for STEMI when PCI is not available or cannot be performed within the recommended time [2]. - Given that the question does not suggest PCI is unavailable, it is not the most appropriate immediate choice in comparison to PCI for STEMI [2].

Q: A 55-year-old patient with cyanosis and a history of atrial fibrillation is at increased risk for which of the following complications?

Thromboembolism. ***Thromboembolism*** - **Atrial fibrillation** causes irregular and often rapid heart rates, leading to inefficient atrial emptying and **blood stasis** within the atria [1]. - This stasis promotes **clot formation**, and these clots can dislodge and travel to other parts of the body, causing **thromboembolic events** like stroke or peripheral arterial occlusion [1]. *Hypercalcemia* - **Hypercalcemia** is an elevated calcium level in the blood, typically associated with **parathyroid disorders** or malignancies. - It does not have a direct causal link to atrial fibrillation or cyanosis. *Hypovolemic shock* - **Hypovolemic shock** is a life-threatening condition resulting from **severe blood or fluid loss**, leading to inadequate organ perfusion. - While patients with heart conditions can experience various shocks, hypovolemic shock is not a direct consequence of atrial fibrillation or cyanosis. *Pulmonary edema* - **Pulmonary edema** is characterized by fluid accumulation in the lungs, often due to **heart failure** or acute respiratory distress syndrome. - While atrial fibrillation can contribute to heart failure, pulmonary edema is a *symptom* of severe heart dysfunction rather than a primary complication of atrial fibrillation in the context of increased embolic risk [2].

Q: A 40F with progressive exertional dyspnea and cyanosis. Physical examination reveals digital clubbing and a loud P2 heart sound. Most appropriate next step in diagnosis?

Echocardiography. ***Echocardiography*** - The presence of **exertional dyspnea**, **cyanosis**, **digital clubbing**, and a **loud P2 heart sound** strongly suggests pulmonary hypertension [1]. - An **echocardiogram** is crucial for directly visualizing the heart chambers and great vessels, allowing for the estimation of **pulmonary artery pressures** and assessing right ventricular function, which is key in diagnosing and evaluating **pulmonary hypertension** [1]. *Pulmonary function test* - While pulmonary function tests (PFTs) assess lung mechanics and volumes, they primarily help diagnose **obstructive** or **restrictive lung diseases**. - PFTs do not directly measure **pulmonary artery pressures** or assess cardiac structure, which are central to the patient's presentation. *Chest X-ray* - A chest X-ray can show signs of **pulmonary hypertension** such as **enlarged pulmonary arteries** or **cardiomegaly** [1], [2]. - However, it provides limited information regarding cardiac function and **pulmonary artery pressures** and is less specific than an echocardiogram for initial diagnosis [1]. *Electrocardiogram* - An ECG can detect signs of **right ventricular hypertrophy** or **right axis deviation**, which may be present in **pulmonary hypertension** [2]. - However, it offers no direct information on **pulmonary artery pressures** or structural abnormalities of the heart chambers.

Q: A 30-year-old woman presents with shortness of breath, cyanosis, and a loud S2 sound on auscultation. Which of the following is the most likely diagnosis?

Pulmonary hypertension. ***Pulmonary hypertension*** - **Shortness of breath** and **cyanosis** indicate severe **hypoxia** and **reduced cardiac output**, which are hallmarks of high **pulmonary artery pressure**. [1] - A **loud S2** results from increased pressure in the pulmonary artery causing a forceful closure of the **pulmonic valve**. *Aortic regurgitation* - Characterized by a **diastolic murmur** and **bounding peripheral pulses**; **cyanosis** and a loud S2 are not typical features. - Patients often present with **dyspnea on exertion**, but not usually with prominent **cyanosis** unless heart failure is very advanced. *Mitral stenosis* - Typically presents with **dyspnea**, **cough**, and a **loud S1**, along with a **diastolic rumble** at the apex. - While it can lead to **pulmonary hypertension**, a loud S2 alone in the absence of a characteristic murmur does not make it the primary diagnosis. *Pericarditis* - Presents with sharp, pleuritic **chest pain** that improves with leaning forward, and often includes a **pericardial friction rub**. - **Shortness of breath** may occur due to pain or tamponade, but **cyanosis** and a loud S2 are not characteristic features of uncomplicated pericarditis.

Q: A 45-year-old woman presents with clubbing and cyanosis. Chest X-ray shows a prominent pulmonary artery. Which congenital heart disease should be considered?

Atrial septal defect (ASD) with Eisenmenger syndrome.. Atrial septal defect (ASD) with Eisenmenger syndrome. - Clubbing, cyanosis, and a prominent pulmonary artery in a 45-year-old suggest long-standing pulmonary hypertension with shunt reversal, characteristic of Eisenmenger syndrome [1]. - An ASD is a common congenital heart defect that can lead to significant left-to-right shunting, eventually causing pulmonary hypertension [1]. and reversed shunt flow (Eisenmenger syndrome) over decades [2]. *Patent ductus arteriosus (PDA) with Eisenmenger syndrome.* - While PDA can also lead to Eisenmenger syndrome, it typically presents with a continuous murmur and often causes symptoms earlier in life if the shunt is large. - The patient's age and the specific features presented are more classic for an ASD progressing to Eisenmenger syndrome. *Tetralogy of Fallot* - This is a cyanotic congenital heart disease from birth or early childhood, commonly presenting with cyanosis and "tet spells" [3]. - While it causes cyanosis, a prominent pulmonary artery is not a typical feature; instead, there is often reduced pulmonary blood flow and a small pulmonary artery due to pulmonary outflow obstruction [3]. *Pulmonary stenosis (PS)* - Pulmonary stenosis primarily causes obstruction to blood flow out of the right ventricle, leading to right ventricular hypertrophy and potentially a systolic murmur. - While severe PS can cause cyanosis due to a right-to-left shunt through an ASD (if present), isolated PS is typically acyanotic and does not usually present with a prominent pulmonary artery or clubbing unless it's very severe and associated with other defects.

Q: A synchronous cardioversion is indicated in which of the following arrhythmias?

Unstable ventricular tachycardia. ***Unstable ventricular tachycardia*** - Synchronous cardioversion is indicated in **unstable ventricular tachycardia (VT)** because the heart still has organized electrical activity, but it's rapid and ineffective, leading to hemodynamic instability [1], [2]. - Synchronization prevents the electrical shock from being delivered during the vulnerable T-wave repolarization, which could induce **ventricular fibrillation** [1]. *Ventricular fibrillation* - Ventricular fibrillation is characterized by **chaotic, disorganized electrical activity** in the ventricles, preventing effective cardiac output [1], [3]. - Due to the lack of organized QRS complexes, **defibrillation (unsynchronized shock)** is the appropriate treatment, as there's no R-wave to synchronize with [3]. *Atrial flutter* - While atrial flutter can sometimes be treated with synchronized cardioversion if it causes hemodynamic instability, it is generally **less urgent** than unstable VT. - The primary indications for cardioversion in atrial flutter are drug-refractory cases or those causing **significant symptoms** or rapid ventricular rates. *Atrial fibrillation* - Synchronous cardioversion can be used for atrial fibrillation, especially if it's **new onset** or causing hemodynamic instability [4]. - However, in hemodynamically stable atrial fibrillation, **rate control** and **anticoagulation** are often the initial management strategies, and cardioversion is not immediately indicated for all cases.

Q: A 64-year-old male with coronary artery disease and hypertension presents with exertional chest pain, shortness of breath, and syncope. Examination reveals a harsh systolic murmur at the right second intercostal space radiating to the carotids. The ECG shows left ventricular hypertrophy, and the echocardiogram indicates increased left ventricular thickness and decreased valve area. Analyze and determine the diagnosis and the next step.

Aortic stenosis; surgical intervention. **Aortic stenosis; surgical intervention** - The patient's symptoms of exertional chest pain, shortness of breath, and syncope, along with a **harsh systolic murmur radiating to the carotids**, are classic signs of **aortic stenosis** [1]. - The echocardiogram findings of **increased left ventricular thickness** (due to pressure overload) and **decreased valve area** confirm severe aortic stenosis [1], necessitating surgical intervention such as **aortic valve replacement** [3]. *Mitral regurgitation; surgical repair* - **Mitral regurgitation** typically presents with a **holosystolic murmur** best heard at the apex and radiating to the axilla, often associated with symptoms of heart failure rather than syncope [4]. - While surgical repair is a treatment for severe mitral regurgitation, the clinical and echocardiographic findings do not support this diagnosis. *Heart failure; beta-blockers* - While the patient exhibits symptoms of heart failure (shortness of breath), **heart failure** is a *consequence* of the underlying valvular disease rather than the primary diagnosis here. - **Beta-blockers** are generally avoided or used with extreme caution in patients with severe aortic stenosis as they can worsen symptoms by reducing contractility and heart rate, leading to decreased cardiac output. *Hypertrophic cardiomyopathy; calcium channel blockers* - **Hypertrophic cardiomyopathy** also causes left ventricular hypertrophy and can lead to syncope [2], but the characteristic murmur is often crescendo-decrescendo and can vary with maneuvers (e.g., Valsalva), sometimes without significant radiation to the carotids. - In this case, the **decreased valve area** strongly points to **aortic stenosis** as the primary issue, and while calcium channel blockers can be used in hypertrophic cardiomyopathy, they are not the primary treatment for severe aortic stenosis.

Q: Which of the following is the most specific marker for detecting myocardial infarction?

Troponin I. ***Troponin I*** - **Cardiac troponin I** is highly specific to myocardial tissue and is released into the bloodstream following myocardial injury. [2] - It remains elevated for an extended period (up to 7-10 days), making it useful for later diagnosis as well. *CK-MB* - While CK-MB is found in cardiac muscle and can rise after myocardial infarction, it is **less specific** than troponin. [2] - CK-MB can also be elevated in conditions involving skeletal muscle damage, such as **rhabdomyolysis** or strenuous exercise. *LDH* - **Lactate dehydrogenase (LDH)** is a non-specific enzyme found in various tissues throughout the body, including the heart, liver, and red blood cells. [1] - Its elevation often indicates general tissue damage rather than specific myocardial injury. [1] *Myoglobin* - **Myoglobin** is one of the earliest markers to rise after myocardial injury due to its small size and rapid release. - However, it lacks cardiac specificity as it is also present in skeletal muscle, leading to false positives in cases of skeletal muscle injury.

Q: A 50-year-old woman with a history of breast cancer treated with radiation presents with shortness of breath and fatigue. Her echocardiogram shows a thickened pericardium and diastolic dysfunction. What is the most likely diagnosis?

Constrictive pericarditis. ***Constrictive pericarditis*** - The history of **radiation therapy** to the chest and echocardiogram findings of a **thickened pericardium** with **diastolic dysfunction** are classic for constrictive pericarditis [1]. - **Shortness of breath** and **fatigue** are common symptoms due to impaired ventricular filling and reduced cardiac output [1], [3]. *Dilated cardiomyopathy* - Characterized by **ventricular dilation** and **systolic dysfunction**, which are not indicated by the thickened pericardium or preserved systolic function in this case. - While it can cause shortness of breath and fatigue, the echocardiogram findings point away from this diagnosis. *Restrictive cardiomyopathy* - Involves **stiff, noncompliant ventricles** leading to diastolic dysfunction, similar to constrictive pericarditis in some regards [2]. - However, the underlying pathology for restrictive cardiomyopathy is myocardial infiltration or fibrosis, and typically does not involve a **thickened pericardium** as the primary finding [2]. *Hypertrophic cardiomyopathy* - Characterized by **ventricular hypertrophy** (thickening of the heart muscle), often asymmetrical, leading to diastolic dysfunction [2]. - There is no mention of ventricular hypertrophy, and the thickened pericardium points to an extrinsic cause rather than intrinsic myocardial disease [4].

Q: In a patient with essential hypertension, what is the target blood pressure according to the most recent guidelines?

Below 130/80 mmHg. ***Below 130/80 mmHg*** - Current guidelines from organizations like the **American College of Cardiology (ACC)** and the **American Heart Association (AHA)** recommend a target blood pressure of **less than 130/80 mmHg** for most adults with essential hypertension. - This target is associated with a reduction in cardiovascular events and all-cause mortality, especially in patients with a higher risk of **atherosclerotic cardiovascular disease (ASCVD)**. [1] *Below 140/90 mmHg* - This was a previous target for many hypertensive patients but has been revised to often be stricter to achieve better cardiovascular outcomes. - While it may still be adequate for very low-risk individuals or those with significant comorbidities where lower targets are unsafe, it's not the general target according to recent guidelines. *Below 120/80 mmHg* - A blood pressure of **120/80 mmHg** is considered **normal** or optimal, but aggressively targeting below this in all hypertensive patients may increase the risk of **adverse events** like syncope or renal dysfunction without significant additional benefit. - This target is not universally recommended for treatment of essential hypertension; rather, it is a healthy goal for the general population. *Below 150/90 mmHg* - This target is generally considered too high for most adults with essential hypertension and would not adequately reduce their risk of cardiovascular complications. - It might be considered for specific elderly populations where aggressive treatment carries more risks than benefits, but it is not the general recommendation.

Question 1

A 55-year-old male presents with severe, crushing chest pain and shortness of breath. ECG shows ST elevation in the inferior leads. What is the most appropriate immediate management?

Accepted Answer

Percutaneous coronary intervention

Answer

Beta blockers

Answer

Oxygen and nitroglycerin

Answer

Thrombolysis

Question 2

A 55-year-old patient with cyanosis and a history of atrial fibrillation is at increased risk for which of the following complications?

Accepted Answer

Thromboembolism

Answer

Hypercalcemia

Answer

Hypovolemic shock

Answer

Pulmonary edema

Question 3

A 40F with progressive exertional dyspnea and cyanosis. Physical examination reveals digital clubbing and a loud P2 heart sound. Most appropriate next step in diagnosis?

Accepted Answer

Echocardiography

Answer

Pulmonary function test

Answer

Chest X-ray

Answer

Electrocardiogram

Question 4

A 30-year-old woman presents with shortness of breath, cyanosis, and a loud S2 sound on auscultation. Which of the following is the most likely diagnosis?

Accepted Answer

Pulmonary hypertension

Answer

Aortic regurgitation

Answer

Mitral stenosis

Answer

Pericarditis

Question 5

A 45-year-old woman presents with clubbing and cyanosis. Chest X-ray shows a prominent pulmonary artery. Which congenital heart disease should be considered?

Accepted Answer

Atrial septal defect (ASD) with Eisenmenger syndrome.

Answer

Patent ductus arteriosus (PDA) with Eisenmenger syndrome.

Answer

Tetralogy of Fallot

Answer

Pulmonary stenosis (PS)

Question 6

A synchronous cardioversion is indicated in which of the following arrhythmias?

Accepted Answer

Unstable ventricular tachycardia

Answer

Ventricular fibrillation

Answer

Atrial flutter

Answer

Atrial fibrillation

Question 7

A 64-year-old male with coronary artery disease and hypertension presents with exertional chest pain, shortness of breath, and syncope. Examination reveals a harsh systolic murmur at the right second intercostal space radiating to the carotids. The ECG shows left ventricular hypertrophy, and the echocardiogram indicates increased left ventricular thickness and decreased valve area. Analyze and determine the diagnosis and the next step.

Accepted Answer

Aortic stenosis; surgical intervention

Answer

Mitral regurgitation; surgical repair

Answer

Heart failure; beta-blockers

Answer

Hypertrophic cardiomyopathy; calcium channel blockers

Question 8

Which of the following is the most specific marker for detecting myocardial infarction?

Accepted Answer

Troponin I

Answer

CK-MB

Answer

LDH

Answer

Myoglobin

Question 9

A 50-year-old woman with a history of breast cancer treated with radiation presents with shortness of breath and fatigue. Her echocardiogram shows a thickened pericardium and diastolic dysfunction. What is the most likely diagnosis?

Accepted Answer

Constrictive pericarditis

Answer

Dilated cardiomyopathy

Answer

Restrictive cardiomyopathy

Answer

Hypertrophic cardiomyopathy

Question 10

In a patient with essential hypertension, what is the target blood pressure according to the most recent guidelines?

Accepted Answer

Below 130/80 mmHg

Answer

Below 140/90 mmHg

Answer

Below 120/80 mmHg

Answer

Below 150/90 mmHg

Cardiology — MCQs

Cardiology — MCQs

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