Cardiology — MCQs
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Pressure difference of 5 mm Hg between the two upper limbs occurs in which congenital heart disease?
All of the following are acyanotic congenital heart diseases except _________
Angle of tracheal bifurcation is increased in which chamber of heart enlargement.
Differential cyanosis is seen in
A patient with VSD in CCF develops clubbing with no cyanosis. The diagnosis is:
Organic cause for erectile dysfunction is most commonly:
A 27-year-old man was assaulted and stabbed on the left side of the chest between the areola and the sternum. He is hemodynamically unstable with jugular venous distention, distant heart sounds, and hypotension. Which of the following findings would be consistent with a diagnosis of hemodynamically significant cardiac tamponade?
Inability to perform any work without discomfort is
Tetralogy of Fallot (TOF) includes all of the following components except:
Epsilon waves are most specific for
Cardiology Indian Medical PG Practice Questions and MCQs
Question 1241: Pressure difference of 5 mm Hg between the two upper limbs occurs in which congenital heart disease?
- A. HOCM
- B. Coarctation of Aorta
- C. Supra-valvular aortic stenosis (Correct Answer)
- D. TOF
Explanation: ***Supra-valvular aortic stenosis*** - **Supravalvular aortic stenosis** causes a **pressure gradient** across the aortic valve, leading to a significant **pressure difference** between the upper limbs, typically with a **higher pressure** in the right arm. - This is due to the **Coanda effect**, where the high-velocity jet of blood preferentially flows up the **right subclavian artery** as it exits the aorta. *HOCM (Hypertrophic Obstructive Cardiomyopathy)* - HOCM is characterized by hypertrophy of the **left ventricular septum** causing **outflow tract obstruction**, but it does not typically cause a significant **pressure difference** between the upper limbs. - The obstruction primarily affects **ventricular ejection** rather than differential flow to major arteries. *Coarctation of Aorta* - **Coarctation of the aorta** causes a significant **blood pressure difference** between the upper and lower extremities, with higher pressures in the arms [1]. - However, it does not typically cause a marked **pressure difference between the two upper limbs**, unless the coarctation is pre-ductal and affects the subclavian artery circulation asymmetrically, which is less common for a difference of just 5 mmHg. *TOF (Tetralogy of Fallot)* - **Tetralogy of Fallot** is a cyanotic heart disease involving **pulmonary stenosis**, ventricular septal defect, overriding aorta, and right ventricular hypertrophy [2]. - While it causes significant circulatory abnormalities and potential for **hypoxia**, it does not inherently lead to a measurable **pressure difference** between the upper limbs.
Question 1242: All of the following are acyanotic congenital heart diseases except _________
- A. PDA
- B. VSD
- C. ASD
- D. Tetralogy of fallot (Correct Answer)
Explanation: ***Tetralogy of Fallot*** - This is a **cyanotic heart disease** due to the combination of four heart defects, leading to a **right-to-left shunt** and deoxygenated blood entering the systemic circulation [1]. - The four defects include a large **ventricular septal defect (VSD)**, **pulmonary stenosis**, an **overriding aorta**, and **right ventricular hypertrophy** [1]. *PDA* - A **patent ductus arteriosus (PDA)** allows blood to flow from the aorta to the pulmonary artery, creating a **left-to-right shunt**, which typically results in an acyanotic condition [3]. - While it can lead to complications like pulmonary hypertension, it does not usually cause cyanosis unless severe pulmonary hypertension develops (Eisenmenger syndrome). *VSD* - A **ventricular septal defect (VSD)** involves an opening between the ventricles, typically causing **left-to-right shunting** [2]. - This increased blood flow to the lungs defines it as an **acyanotic** condition because oxygenated blood from the left side is rerouted to the lungs. *ASD* - An **atrial septal defect (ASD)** is a hole in the septum separating the atria, usually leading to a **left-to-right shunt** from the left atrium to the right atrium [4]. - The increased blood flow to the right side of the heart and lungs makes it an **acyanotic** condition, as oxygenated blood continues to be delivered systemically.
Question 1243: Angle of tracheal bifurcation is increased in which chamber of heart enlargement.
- A. Left ventricle
- B. Right atrium
- C. Right ventricle
- D. Left atrium (Correct Answer)
Explanation: ***Left atrium*** - An enlarged **left atrium** can lift the **left main bronchus**, increasing the angle between the two main bronchi, known as the **carinal angle** (or angle of tracheal bifurcation), visible on a chest X-ray. - This is a common radiological sign seen in conditions causing left atrial enlargement, such as **mitral stenosis** [2]. *Left ventricle* - **Left ventricular enlargement** primarily causes the cardiac apex to shift downward and laterally, but it typically does not directly impinge on the main bronchi to increase the carinal angle [1]. - While it can indirectly affect lung fields due to **pulmonary congestion**, it doesn't cause this specific sign [1]. *Right atrium* - **Right atrial enlargement** causes a bulging of the right border of the heart on a chest X-ray [1]. - It does not directly interact with or displace the main bronchi in a way that would alter the **tracheal bifurcation angle**. *Right ventricle* - **Right ventricular enlargement** can cause the heart to push into the retrosternal space and elevate the apex, but it generally does not impinge upon the main bronchi to change the **carinal angle** [1]. - Its effects are more focused on the anterior and rightward aspects of the heart.
Question 1244: Differential cyanosis is seen in
- A. All of the options
- B. VSD
- C. PDA (Correct Answer)
- D. ASD
Explanation: ***PDA*** - **Differential cyanosis** occurs in **Patent Ductus Arteriosus (PDA)** with **pulmonary hypertension** and **reversed shunt** [1]. - Deoxygenated blood from the pulmonary artery shunts into the **descending aorta** distal to the subclavian artery, leading to cyanosis in the lower extremities, typically sparing the right upper extremity unless there is a pre-ductal coarctation or an anomalous right subclavian artery from the descending aorta. *All of the options* - This is incorrect because differential cyanosis is a specific finding associated predominantly with **right-to-left shunting** through a patent ductus arteriosus. - While other congenital heart defects can cause cyanosis, few cause the distinct pattern of differential cyanosis. *VSD* - **Ventricular Septal Defect (VSD)** typically causes a **left-to-right shunt**, leading to increased pulmonary blood flow, and eventually pulmonary hypertension [2]. - If Eisenmenger syndrome develops with a **reverses shunt (right-to-left)**, it would cause **generalized cyanosis**, not differential cyanosis, as the shunting occurs at the ventricular level before the great arteries diverge. *ASD* - **Atrial Septal Defect (ASD)** creates a **left-to-right shunt** at the atrial level, increasing pulmonary blood flow [3]. - The development of **Eisenmenger syndrome** with a right-to-left shunt in ASD would also lead to **generalized cyanosis** because deoxygenated blood mixes in the left atrium before being ejected into the systemic circulation.
Question 1245: A patient with VSD in CCF develops clubbing with no cyanosis. The diagnosis is:
- A. Subacute bacterial Endocarditis
- B. Right to left shunt (Correct Answer)
- C. Pulm. edema
- D. Left to right shunt
Explanation: ***Right to left shunt*** - The development of **clubbing** in a patient with a VSD suggests **chronic hypoxemia**, which in this context indicates a **right-to-left shunt**. [1] - While cyanosis is often present with significant right-to-left shunts, its absence might mean it is **subtle**, or the patient has adjusted to a **lower oxygen saturation threshold** for perceived cyanosis. [2] *Subacute bacterial Endocarditis* - Although **clubbing** can be a feature of **subacute bacterial endocarditis (SBE)**, this condition is more typically associated with systemic symptoms like fever, fatigue, and new or worsening heart murmurs. - The primary presentation here is clubbing in the context of a VSD and CCF, making SBE a less direct explanation for the immediate pathophysiology of clubbing. *Pulm. edema* - **Pulmonary edema** is characterized by **shortness of breath**, coughing, and crackles on pulmonary auscultation, resulting from fluid accumulation in the lungs. [3] - It does not directly cause **clubbing**, which is a sign of chronic tissue hypoxia. *Left to right shunt* - A **left-to-right shunt** in a VSD leads to **pulmonary hypertension** and congestive heart failure but generally does not cause **hypoxemia** or **clubbing**. - Clubbing is a sign of **cyanotic heart disease**, which requires at least a temporary or persistent **right-to-left shunt**.
Question 1246: Organic cause for erectile dysfunction is most commonly:
- A. Psychological
- B. Neuronal
- C. Vascular (Correct Answer)
- D. Hormonal
Explanation: ***Vascular*** - **Vascular disease** is the most common organic cause of erectile dysfunction, primarily due to conditions like **atherosclerosis** affecting penile arteries [3]. - Reduced blood flow to the penis, essential for achieving and maintaining an erection, directly results from vascular impairment [2]. *Psychological* - While **psychological factors** are common causes of ED, they are considered non-organic, involving anxiety, stress, or relationship issues [1]. - Psychological ED often presents with normal nocturnal erections, which are absent in organic causes. *Neuronal* - **Neuronal causes** (e.g., spinal cord injury, **multiple sclerosis**, diabetic neuropathy) can lead to ED but are less frequent than vascular causes [2]. - These conditions disrupt nerve signals necessary for penile erection, but typically involve other neurological symptoms. *Hormonal* - **Hormonal imbalances**, such as low testosterone (hypogonadism), contribute to ED but are responsible for a smaller percentage of cases compared to vascular issues [3]. - Patients with hormonal ED may also experience decreased libido, fatigue, and other symptoms related to the specific hormone deficiency.
Question 1247: A 27-year-old man was assaulted and stabbed on the left side of the chest between the areola and the sternum. He is hemodynamically unstable with jugular venous distention, distant heart sounds, and hypotension. Which of the following findings would be consistent with a diagnosis of hemodynamically significant cardiac tamponade?
- A. Decreased right atrial pressures on Swan-Ganz monitoring
- B. Equalization of pressures across the 4 chambers on Swan-Ganz monitoring (Correct Answer)
- C. More than a 10 mm Hg decrease in systolic blood pressure during inspiration (pulsus paradoxus)
- D. Compression of the left ventricle on echocardiography
Explanation: ***Equalization of pressures across the 4 chambers on Swan-Ganz monitoring*** - In **cardiac tamponade**, the accumulation of fluid in the pericardial sac elevates intracardiac and pericardial pressures, leading to **equalization of diastolic pressures** in the right atrium, right ventricle, left atrium, and left ventricle. - This equalization signifies a constricted heart unable to fill properly, a hallmark of hemodynamically significant tamponade. *Decreased right atrial pressures on Swan-Ganz monitoring* - **Decreased right atrial pressure** would indicate **hypovolemia** or **reduced venous return**, the opposite of what occurs in cardiac tamponade where elevated pressures are expected due to fluid accumulation. - In tamponade, the right atrial pressure is typically **elevated** and approximates other diastolic cardiac pressures. *More than a 10 mm Hg decrease in systolic blood pressure during inspiration (pulsus paradoxus)* - **Pulsus paradoxus** is a common and important finding in cardiac tamponade, but it is a **clinical sign** observed during blood pressure measurement, not a direct finding from Swan-Ganz monitoring. - While supportive of the diagnosis, the question asks for a finding consistent with **Swan-Ganz monitoring**, making equalization of pressures a more direct and specific answer in this context. *Compression of the left ventricle on echocardiography* - **Echocardiography** would show **compression of the right ventricle** and potentially the right atrium, particularly during diastole, due to increased pericardial pressure. - While significant, visualization of compressed chambers is an **echocardiographic finding**, not a measurement obtained from **Swan-Ganz monitoring**.
Question 1248: Inability to perform any work without discomfort is
- A. NYHA 4 (Correct Answer)
- B. NYHA 3
- C. NYHA 1
- D. NYHA 2
Explanation: ***NYHA 4*** - **Class IV** of the **New York Heart Association (NYHA) Functional Classification** describes individuals who are unable to carry on any physical activity without symptoms, and may even experience symptoms at rest [1]. - This classification indicates **severe heart failure**, where patients experience extreme limitations in their daily life due to discomfort, shortness of breath, or angina [1], [2]. *NYHA 3* - **Class III** patients experience **marked limitation of physical activity**; they are comfortable at rest but ordinary physical activity causes fatigue, palpitations, dyspnea, or anginal pain [1]. - This is a less severe functional impairment than Class IV, as patients are still comfortable at rest, unlike those in Class IV [1]. *NYHA 1* - **Class I** patients have **no limitation of physical activity**; ordinary physical activity does not cause undue fatigue, palpitations, dyspnea, or anginal pain [1]. - This represents the mildest form of heart failure, where there are no symptoms during normal activities [1]. *NYHA 2* - **Class II** patients have **slight limitation of physical activity**; they are comfortable at rest, but ordinary physical activity results in fatigue, palpitation, dyspnea, or anginal pain [1]. - While there is some limitation, it is not as profound as Class IV, where any activity results in discomfort, and symptoms can occur even at rest [1].
Question 1249: Tetralogy of Fallot (TOF) includes all of the following components except:
- A. VSD
- B. ASD (Correct Answer)
- C. Pulmonary stenosis
- D. RVH
Explanation: ***ASD*** - While an **atrial septal defect (ASD)** can be present in some complex congenital heart diseases, it is **not considered a primary component of Tetralogy of Fallot** [1]. - The four classic components of **TOF** are **ventricular septal defect (VSD)**, **pulmonary stenosis**, **overriding aorta**, and **right ventricular hypertrophy (RVH)** [1]. *VSD* - A **ventricular septal defect (VSD)** is a **mandatory component** of Tetralogy of Fallot, allowing for mixing of oxygenated and deoxygenated blood [1]. - It's typically a **large, subaortic defect** that enables the overriding aorta to receive blood from both ventricles [1]. *Pulmonary stenosis* - **Pulmonary stenosis** (obstruction of blood flow from the right ventricle to the pulmonary artery) is a **key component** determining the severity of Tetralogy of Fallot [1]. - The degree of **pulmonary stenosis** dictates the amount of right-to-left shunting and the clinical manifestation of **cyanosis** [1]. *RVH* - **Right ventricular hypertrophy (RVH)** develops as a compensatory mechanism due to the increased workload on the right ventricle from the **pulmonary stenosis** and the **VSD** [1]. - It is a **consequence** of the increased pressure required to eject blood past the stenotic pulmonary valve and into the systemic circulation through the VSD [1].
Question 1250: Epsilon waves are most specific for
- A. Arrhythmogenic RV Cardiomyopathy (Correct Answer)
- B. Hypokalemia
- C. Hypothermia
- D. PSVT
Explanation: ***Arrhythmogenic RV Cardiomyopathy*** - Epsilon waves are small, positive deflections seen at the end of the **QRS complex**, best observed in precordial leads (V1-V3), and are a characteristic ECG finding in **Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC)**. - They represent delayed and fragmented electrical activity due to fibrofatty replacement of the right ventricular myocardium in ARVC. *Hypokalemia* - **Hypokalemia** typically manifests on ECG with **U waves**, which are positive deflections following the T wave, not epsilon waves. - Other ECG changes in hypokalemia include flattened T waves and ST-segment depression. *Hypothermia* - **Hypothermia** is associated with the presence of **Osborn waves** (J waves), which are positive deflections at the junction of the QRS complex and the ST segment. - These waves are distinct from epsilon waves and represent slowed repolarization. *PSVT* - **Paroxysmal Supraventricular Tachycardia (PSVT)** is a type of arrhythmia characterized by a narrow QRS complex tachycardia with a regular rhythm. - It does not involve epsilon waves; its ECG features are related to abnormal conduction pathways in the atria or AV node.
Practice by Chapter
Coronary Artery Disease and Angina
Practice Questions
Acute Coronary Syndromes
Practice Questions
Heart Failure
Practice Questions
Cardiac Arrhythmias
Practice Questions
Valvular Heart Diseases
Practice Questions
Cardiomyopathies
Practice Questions
Pericardial Diseases
Practice Questions
Congenital Heart Disease in Adults
Practice Questions
Hypertension and Hypertensive Emergencies
Practice Questions
Pulmonary Hypertension
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Non-invasive Cardiac Diagnostics
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Preventive Cardiology
Practice Questions
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