Cardiology Practice Questions

Q: Which of the following is associated with WPW syndrome?

Ebstein anomaly. ***Ebstein anomaly*** - **Ebstein anomaly** is a congenital heart defect characterized by apical displacement of the septal and posterior leaflets of the tricuspid valve, which is strongly associated with **Wolff-Parkinson-White (WPW) syndrome.** - WPW syndrome, involving an **accessory pathway** that bypasses the AV node [1], is found in 5-25% of patients with Ebstein anomaly, predisposing them to re-entrant tachycardias [3]. *TOF* - **Tetralogy of Fallot (TOF)** is a complex cyanotic congenital heart defect that includes four main features: VSD, pulmonary stenosis, overriding aorta, and right ventricular hypertrophy [2]. - There is no direct or strong association between TOF and WPW syndrome. *VSD* - A **Ventricular Septal Defect (VSD)** is a common congenital heart defect where there is an opening in the interventricular septum, allowing blood to flow between the ventricles [4]. - While VSDs can occur with other cardiac anomalies, there is no specific or frequent association with WPW syndrome. *TAPVC* - **Total Anomalous Pulmonary Venous Connection (TAPVC)** is a rare congenital heart defect where all four pulmonary veins connect to the systemic venous circulation instead of the left atrium. - This condition does not have a recognized association with WPW syndrome.

Q: In which of the following conditions is differential cyanosis observed?

PDA with reversal of shunt. ***PDA with reversal of shunt*** - **Differential cyanosis** is characteristic of a **patent ductus arteriosus (PDA)** with **Eisenmenger syndrome**, where the shunt reverses due to pulmonary hypertension [1]. - Deoxygenated blood from the pulmonary artery shunts into the **descending aorta** distal to the origin of the subclavian arteries, resulting in cyanosis of the lower extremities while the upper extremities remain pink [1]. *VSD with reversal of shunt* - A **ventricular septal defect (VSD)** with reversed shunt typically causes **generalized cyanosis** because deoxygenated blood is shunted from the right ventricle to the left ventricle, affecting both systemic circulations [2]. - It does not produce differential cyanosis unless accompanied by coexisting cardiac anomalies that selectively affect blood flow to different parts of the body. *ASD with reversal of shunt* - An **atrial septal defect (ASD)** with reversed shunt leads to **generalized cyanosis**, as deoxygenated blood from the right atrium enters the left atrium and mixes with oxygenated blood, distributing cyanosis throughout the body [2]. - The mixing of blood occurs at the atrial level, affecting systemic circulation uniformly rather than differentially. *Tetralogy of Fallot* - **Tetralogy of Fallot** causes **generalized cyanosis** due to the right-to-left shunt through a large VSD, forcing deoxygenated blood into the systemic circulation [3]. - The degree of cyanosis depends on the severity of the right ventricular outflow tract obstruction, but it is not typically differential [3].

Q: In the management of a patient with acute myocardial infarction, which of the following is the most critical step in the initial treatment?

Administering aspirin. - **Aspirin** is crucial in the immediate management of **acute myocardial infarction (AMI)** due to its **antiplatelet effects**, which prevent further thrombus formation in the coronary arteries [1]. - It rapidly inhibits **cyclooxygenase-1 (COX-1)**, reducing **thromboxane A2** production and thus platelet aggregation, limiting infarct size and improving outcomes. *Performing coronary angiography* - While essential for definitive diagnosis and revascularization (e.g., PCI), **coronary angiography** is typically performed after initial medical stabilization and is not the *first* critical step [2]. - Delay in initial medical therapy to prioritize angiography can worsen myocardial damage. *Initiating thrombolytic therapy* - **Thrombolytic therapy** is a revascularization strategy, similar to PCI, used when immediate catheterization is not available, but it comes with a risk of bleeding [3]. - It is often initiated after **aspirin** and other immediate stabilizing medications, and its use depends on specific criteria and contraindications [3]. *Administering beta-blockers* - **Beta-blockers** are important in AMI management to reduce myocardial oxygen demand, control arrhythmias, and improve long-term outcomes. - However, their administration typically follows **aspirin** and other initial stabilizing measures, and they may be contraindicated in certain conditions like **acute heart failure** or **bradycardia** [2].

Q: Treatment of choice for prinzmetal's angina

Calcium Channel Blockers (CCBs). ***Calcium Channel Blockers (CCBs)*** - **Dihydropyridine** CCBs like nifedipine or amlodipine, and **non-dihydropyridine** CCBs like diltiazem or verapamil, are the **first-line agents** for Prinzmetal's angina [1]. - They work by **relaxing coronary smooth muscle**, preventing the vasospasm that causes the angina [1]. *Nitroglycerin* - **Nitroglycerin is effective** for acute relief of Prinzmetal's angina symptoms due to its **vasodilatory properties**. - However, it's typically used as **rescue therapy** and not as a long-term preventative treatment. *Beta-blockers* - Beta-blockers are **contraindicated** in Prinzmetal's angina as they can **worsen coronary vasospasm** by blocking beta-2 mediated vasodilation, leaving unopposed alpha-1 vasoconstriction [2]. - They can increase the **frequency and severity of attacks**. *Prazosin* - Prazosin is an **alpha-1 adrenergic blocker** used primarily for **hypertension** and benign prostatic hyperplasia. - While it can cause vasodilation, it is **not the treatment of choice** for Prinzmetal's angina and is less effective than CCBs in preventing coronary spasm.

Q: Creatine kinase is elevated in MI after

2-4 hours. ***2-4 hours*** - **Creatine kinase (CK)** levels typically begin to rise within **2-4 hours** after the onset of myocardial infarction. - This early elevation makes CK an effective, though non-specific, marker for **acute MI** in the initial stages [1]. *4-8 hours* - While CK levels may continue to rise during this period, the initial measurable elevation usually occurs earlier, within **2-4 hours**. - A significant elevation at 4-8 hours would indicate that the myocardial event occurred at least several hours prior. *12-24 hours* - Creatine kinase levels typically peak much earlier, between **12-24 hours**, rather than just beginning to elevate at this time. - By this time, other more specific markers like **troponins** would also be significantly elevated and are often preferred for diagnosis [1], [2]. *>24 hours* - Beyond 24 hours, CK levels usually start to decline, making it less useful for the initial detection of an acute MI that began many hours earlier. - For events occurring over 24 hours ago, a positive CK would indicate that the event had happened, but it's not the first time it would be elevated.

Q: Which of the following is a non- modifiable risk factor for CHD -

Old age. Old age - Age is a **non-modifiable risk factor** for Coronary Heart Disease (CHD) because it is an inherent biological process that cannot be changed [3]. - The risk of developing CHD **increases with age** due to cumulative exposure to other risk factors and natural wear and tear on the cardiovascular system [3]. *Diabetes* - Diabetes is a **modifiable risk factor** for CHD because it can be managed and controlled through lifestyle changes, medication, and regular monitoring [2]. - **Poorly controlled diabetes** significantly increases the risk of heart disease by damaging blood vessels and promoting atherosclerosis. *Smoking* - Smoking is a highly **modifiable risk factor** for CHD as it can be completely stopped [1], [2]. - **Cessation of smoking** significantly reduces the risk of heart attack and stroke over time [1]. *Hypertension* - Hypertension is a **modifiable risk factor** for CHD because blood pressure can be lowered through lifestyle interventions, such as diet and exercise, and pharmacotherapy [2]. - **Uncontrolled high blood pressure** places increased stress on the heart and blood vessels, accelerating the development of atherosclerosis [1].

Q: Kussmaul's sign is classically described in:

Chronic inflammatory heart condition. ***Chronic inflammatory heart condition*** - **Kussmaul's sign**, characterized by a paradoxical rise in **jugular venous pressure (JVP)** during inspiration, is classically seen in conditions like **constrictive pericarditis** [1], which is often a chronic inflammatory heart condition. - This sign reflects the heart's inability to accommodate increased venous return during inspiration due to a rigid, fibrotic pericardium [1]. *Acute cardiac compression* - **Cardiac tamponade** [3], a form of acute cardiac compression, typically presents with **pulsus paradoxus** and muffled heart sounds, not Kussmaul's sign. - While it involves elevated JVP, the paradoxical inspiratory rise is less common compared to constrictive pericarditis. *Acute myocardial damage* - **Acute myocardial infarction** [2] or myocarditis, leading to acute myocardial damage, primarily causes symptoms related to reduced cardiac output and arrhythmias, such as chest pain or dyspnea. - Kussmaul's sign is not a typical feature of acute myocardial damage because the pericardium is usually not rigid or constricting. *Chronic ventricular stiffening* - Conditions involving **chronic ventricular stiffening**, such as **restrictive cardiomyopathy**, can mimic some features of constrictive pericarditis, including elevated JVP and sometimes Kussmaul's sign. - However, the classic description and most prominent cases of Kussmaul's sign are associated with external compression from a diseased pericardium rather than intrinsic myocardial stiffness, although differentiation can be challenging.

Q: What is the most common complication of a large Patent Ductus Arteriosus (PDA)?

Congestive Heart Failure (CHF). ***Congestive Heart Failure (CHF)*** - A large PDA results in a significant **left-to-right shunt**, increasing pulmonary blood flow and leading to **pulmonary overcirculation**. [1] - This increased workload on the heart, particularly the left atrium and ventricle, can lead to **ventricular dysfunction** and ultimately CHF. [1] *Eisenmenger syndrome* - While a severe complication of an untreated large PDA, it represents a **late stage** where the left-to-right shunt has reversed due to **pulmonary hypertension**. [1] - It is not the *most common* initial complication, as CHF often develops earlier in the disease progression. *Infective endocarditis* - This is a potential long-term complication of a PDA, especially if untreated, due to the **turbulent blood flow** across the ductus. - However, it is less common than CHF, which results directly from the hemodynamic burden imposed by a large shunt. *None of the options* - This option is incorrect because **Congestive Heart Failure** is indeed a very common and significant complication of a large Patent Ductus Arteriosus.

Q: In Marfan's syndrome, Aortic aneurysm occurs most commonly in:

Ascending aorta. ***Ascending aorta*** - The **ascending aorta** is the most common site for aortic aneurysm and dissection in Marfan syndrome due to cystic medial degeneration weakening the vessel wall [1]. - This predisposition is linked to defects in the **fibrillin-1 gene (FBN1)**, severely impacting the structural integrity of the arterial media primarily in the ascending aorta [1]. *Descending aorta* - While possible, **descending aortic** involvement is less common than ascending aortic involvement in Marfan syndrome [2]. - Aneurysms here are more frequently associated with atherosclerosis or other connective tissue disorders. *Abdominal aorta* - **Abdominal aortic aneurysms** are relatively rare in Marfan syndrome and are more typically seen in older patients with atherosclerosis [3]. - The disease primarily affects the elastic tissue content, which is most abundant in the proximal aorta. *Arch of aorta* - Aortic arch aneurysms can occur, but they are still less frequent than those in the **ascending aorta** as the primary initial site of dilation and dissection in Marfan syndrome. - Arch involvement often represents an extension of a more proximal ascending aortic pathology.

Question 1

Which of the following is associated with WPW syndrome?

Accepted Answer

Ebstein anomaly

Answer

TOF

Answer

VSD

Answer

TAPVC

Question 2

In which of the following conditions is differential cyanosis observed?

Accepted Answer

PDA with reversal of shunt

Answer

VSD with reversal of shunt

Answer

ASD with reversal of shunt

Answer

Tetralogy of Fallot

Question 3

What is the most likely cause of fluid overload in a patient presenting with shortness of breath?

Accepted Answer

Cardiac failure

Answer

Nephritic syndrome

Answer

TB

Answer

Portal hypertension

Question 4

In the management of a patient with acute myocardial infarction, which of the following is the most critical step in the initial treatment?

Accepted Answer

Administering aspirin

Answer

Administering beta-blockers

Answer

Performing coronary angiography

Answer

Initiating thrombolytic therapy

Question 5

Treatment of choice for prinzmetal's angina

Accepted Answer

Calcium Channel Blockers (CCBs)

Answer

Nitroglycerin

Answer

Prazosin

Answer

Beta-blockers

Question 6

Creatine kinase is elevated in MI after

Accepted Answer

2-4 hours

Answer

4-8 hours

Answer

>24 hours

Answer

12-24 hours

Question 7

Which of the following is a non- modifiable risk factor for CHD -

Accepted Answer

Old age

Answer

Diabetes

Answer

Smoking

Answer

Hypertension

Question 8

Kussmaul's sign is classically described in:

Accepted Answer

Chronic inflammatory heart condition

Answer

Acute myocardial damage

Answer

Acute cardiac compression

Answer

Chronic ventricular stiffening

Question 9

What is the most common complication of a large Patent Ductus Arteriosus (PDA)?

Accepted Answer

Congestive Heart Failure (CHF)

Answer

Eisenmenger syndrome

Answer

Infective endocarditis

Answer

None of the options

Question 10

In Marfan's syndrome, Aortic aneurysm occurs most commonly in:

Accepted Answer

Ascending aorta

Answer

Descending aorta

Answer

Abdominal aorta

Answer

Arch of aorta

Cardiology — MCQs

Cardiology — MCQs

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