Congenital Heart Disease in Adults — MCQs

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Congenital Heart Disease in Adults — MCQs

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Induction agent of choice in a child with cyanotic heart disease is

Tetralogy of Fallot's includes all except -

Eisenmenger complex is common in adult in –

Which of the following does not complicate into CHF –

Which of these acyanotic congenital heart diseases is associated with volume overload?

A 6-year-old with congenital heart disease presents with fever, new-onset murmur, and petechiae. Blood cultures are pending, but initial Gram stain shows Gram-positive cocci. What is the most appropriate initial intervention?

A judge can ask clarifying questions when:

Ketamine is contraindicated in which of the following situations?

Subarachnoid block as anaesthesia is contraindicated in –

Q10Medium

Which of the following is NOT a treatment for supraventricular tachycardia with hypotension in a patient under general anesthesia?

Congenital Heart Disease in Adults Indian Medical PG Practice Questions and MCQs

Question 1: Induction agent of choice in a child with cyanotic heart disease is

A. Thiopentone
B. Ketamine (Correct Answer)
C. Halothane
D. Midazolam

Explanation: ***Ketamine*** - **Ketamine** is preferred in cyanotic heart disease because it generally maintains or even **increases systemic vascular resistance** and **blood pressure**, which helps maintain systemic-pulmonary shunting and reduces right-to-left shunting. - It also has a **sympathomimetic effect**, supporting myocardial contractility and heart rate, which is beneficial in patients with compromised cardiac function. *Thiopentone* - **Thiopentone** can cause **myocardial depression** and **vasodilation**, leading to a decrease in systemic vascular resistance. - This reduction in SVR can exacerbate **right-to-left shunting** in cyanotic heart disease, worsening hypoxemia. *Halothane* - **Halothane** is a potent **myocardial depressant** and causes significant **peripheral vasodilation**, leading to decreased blood pressure and systemic vascular resistance. - These effects can lead to a severe decrease in **pulmonary blood flow** and an increase in **right-to-left shunting**, worsening cyanosis and hypoxemia. *Midazolam* - **Midazolam** is a benzodiazepine primarily used for **sedation** and anxiolysis, not as a primary induction agent in critically ill children. - While it has minimal effects on cardiac output at typical doses, it lacks the favorable hemodynamic profile of ketamine for maintaining **organ perfusion** and preventing increased right-to-left shunting in cyanotic heart disease.

Question 2: Tetralogy of Fallot's includes all except -

A. VSD
B. ASD (Correct Answer)
C. Pulmonary stenosis
D. RVH

Explanation: ***ASD*** - An **atrial septal defect (ASD)** is not considered one of the four classic components of **Tetralogy of Fallot (TOF)**. - While other cardiac defects can co-exist with TOF, an ASD is not a primary defining feature of the syndrome. - The **four classic components** of TOF are: VSD, pulmonary stenosis, RVH, and **overriding aorta**. *VSD* - A **ventricular septal defect (VSD)** is one of the four essential components of **Tetralogy of Fallot**, allowing communication between the ventricles. - It is typically a large, **malalignment VSD** that is a critical part of the pathophysiology. *Pulmonary stenosis* - **Pulmonary stenosis** (often infundibular, valvular, or supravalvular) is a key defining feature, leading to obstruction of blood flow from the right ventricle to the pulmonary artery. - The degree of pulmonary stenosis determines the severity of the **cyanosis** and clinical presentation. *RVH* - **Right ventricular hypertrophy (RVH)** develops as a compensatory mechanism due to the increased workload on the right ventricle to pump blood across the stenotic pulmonary valve. - This is a direct consequence of the **pulmonary stenosis** and is one of the four classic components of the syndrome.

Question 3: Eisenmenger complex is common in adult in –

A. Cushion defect
B. ASD
C. PDA
D. VSD (Correct Answer)

Explanation: ***VSD*** - A large, uncorrected **ventricular septal defect (VSD)** is the most common congenital heart defect to progress to **Eisenmenger syndrome** in adults. [1] - The bidirectional or right-to-left shunting through the VSD eventually leads to **pulmonary hypertension** and and systemic cyanosis. [1] *Cushion defect* - While **atrioventricular septal defects (AVSDs)**, or cushion defects, can lead to pulmonary hypertension, they are less common causes of Eisenmenger syndrome than VSDs in adults. [1] - They involve defects in both atrial and ventricular septa, often seen in individuals with **Down syndrome**. [1] *ASD* - **Atrial septal defects (ASDs)** typically involve left-to-right shunting, and while they can cause pulmonary hypertension over many decades, they rarely progress to full Eisenmenger syndrome due to the lower pressure differential between the atria. [1] - The elevated pulmonary pressures with ASD tend to be less severe and slower in onset compared to VSDs or PDAs. [1] *PDA* - A **patent ductus arteriosus (PDA)** can lead to Eisenmenger syndrome, but it is less common in adults than VSDs because PDAs are often recognized and closed earlier in life. [1] - An uncorrected large PDA results in chronic left-to-right shunting, leading to increased pulmonary blood flow and subsequent **pulmonary vascular disease**. [1]

Question 4: Which of the following does not complicate into CHF –

A. Patent ductus arteriosus
B. Transposition of great vessels
C. Coarctation of aorta
D. Tetralogy of Fallot (Correct Answer)

Explanation: ***Tetralogy of Fallot*** - This condition is characterized by **right-to-left shunting** due to a large ventricular septal defect (VSD) and right ventricular outflow tract obstruction, leading to **cyanosis** rather than heart failure. - The right ventricular hypertrophy and pulmonary stenosis in Tetralogy of Fallot actually **protect the pulmonary circulation** from volume overload, thus reducing the risk of CHF. *Patent ductus arteriosus* - A PDA causes a **left-to-right shunt** from the aorta to the pulmonary artery, increasing pulmonary blood flow and leading to **pulmonary hypertension** and eventually **left ventricular volume overload**, which can lead to CHF. - The continuous flow through the PDA can cause **volume overload** on the left ventricle and a subsequent increase in cardiac work leading to heart failure. *Transposition of great vessels* - In TGV, the aorta arises from the right ventricle and the pulmonary artery from the left ventricle, creating **two parallel circulations**. Complete TGV without a septal defect is incompatible with life. - If a VSD is present, it can lead to **volume overload** of the left ventricle and pulmonary hypertension, increasing the risk of CHF. *Coarctation of aorta* - This is a narrowing of the aorta, typically distal to the left subclavian artery, causing **increased afterload** on the left ventricle. - The increased workload and pressure overload on the left ventricle can lead to **left ventricular hypertrophy** and ultimately **heart failure**.

Question 5: Which of these acyanotic congenital heart diseases is associated with volume overload?

A. Aortic stenosis
B. None of the options
C. Ventricular septal defect (Correct Answer)
D. Coarctation of aorta

Explanation: ***Ventricular septal defect*** - A **ventricular septal defect (VSD)** causes a left-to-right shunt, leading to increased blood flow to the **pulmonary circulation** and the left side of the heart [1]. - This increased blood flow results in a **volume overload state** for the left atrium and left ventricle [1]. *Aortic stenosis* - **Aortic stenosis (AS)** is characterized by an obstruction to outflow from the left ventricle, leading to **pressure overload** on the left ventricle, not volume overload. - While prolonged AS can cause left ventricular hypertrophy, it doesn't primarily cause the type of volume overload seen with shunts. *None of the options* - This option is incorrect because **ventricular septal defect** is a specific acyanotic congenital heart disease that causes significant volume overload [1]. - **VSDs** are a classic example of conditions leading to increased pulmonary blood flow and chamber dilation due to shunting [1]. *Coarctation of aorta* - **Coarctation of the aorta** is a narrowing of the aorta, primarily causing **pressure overload** in the left ventricle due to increased resistance to systemic blood flow. - It does not cause a shunt or increased pulmonary blood flow, thus not leading to volume overload in the same way as VSD.

Question 6: A 6-year-old with congenital heart disease presents with fever, new-onset murmur, and petechiae. Blood cultures are pending, but initial Gram stain shows Gram-positive cocci. What is the most appropriate initial intervention?

A. Schedule for urgent valve replacement
B. Administer high-dose steroids
C. Start broad-spectrum antibiotics (Correct Answer)
D. Wait for susceptibility testing

Explanation: ***Start broad-spectrum antibiotics*** - The presentation of **fever**, **new-onset murmur**, **petechiae**, and **Gram-positive cocci** in a patient with **congenital heart disease** is highly suggestive of **infective endocarditis**. - Prompt initiation of **broad-spectrum antibiotics** is crucial to prevent further damage to the heart valves and systemic complications while awaiting definitive culture results. *Schedule for urgent valve replacement* - **Valve replacement** is a definitive treatment for severe valvular damage but is typically considered after initial medical management has failed or in cases of severe complications like heart failure or recurrent emboli. - It is not the initial intervention for suspected infective endocarditis. *Administer high-dose steroids* - **Steroids** are anti-inflammatory but are not indicated in the treatment of active bacterial infections like endocarditis. - Administering steroids could potentially worsen the infection by suppressing the immune response. *Wait for susceptibility testing* - **Waiting for susceptibility testing** to initiate treatment would delay critical care, allowing the infection to progress and increasing morbidity and mortality. - Initial treatment should be empiric, and antibiotics can be narrowed once susceptibility results are available.

Question 7: A judge can ask clarifying questions when:

A. At any time during the proceedings (Correct Answer)
B. Before cross-examination
C. During witness testimony only
D. After cross-examination

Explanation: ***At any time during the proceedings*** - A judge's primary role is to ensure **justice** and clarity in the courtroom. Therefore, they are permitted to ask **clarifying questions** at any juncture. - This ensures they understand the evidence, testimony, and arguments presented by all parties for a fair adjudication. *Before cross-examination* - While a judge can ask questions at this stage, limiting it to "before cross-examination" is **too restrictive** and does not accurately reflect their inherent authority throughout a trial. - Their ability to seek clarification is not bound by specific procedural intervals like the start of cross-examination. *During witness testimony only* - This option is **too narrow** as a judge may need to clarify points made during opening statements, closing arguments, or even legal motions, not just during direct or cross-examination of a witness. - Limiting it to witness testimony would **impede their ability** to fully understand all aspects of the case. *After cross exam* - This is also an **incomplete** statement, as waiting until after cross-examination could mean missing opportunities to clarify earlier ambiguities that might affect subsequent testimony or arguments. - A judge's power to clarify is **continuous** and not confined to the end of a specific examination phase.

Question 8: Ketamine is contraindicated in which of the following situations?

A. For analgesia & sedation
B. Obstetric hemorrhage
C. Status asthmaticus
D. Ischemic heart disease (Correct Answer)

Explanation: ***Ischemic heart disease*** - **Ketamine** causes a dose-dependent increase in **heart rate**, **blood pressure**, and **myocardial oxygen demand** due to sympathetic stimulation. - In patients with **ischemic heart disease**, this increased demand can precipitate **myocardial ischemia** or infarction, making it a contraindication. *Status asthmaticus* - **Ketamine** is often beneficial in **status asthmaticus** due to its **bronchodilatory effects**, resulting from direct smooth muscle relaxation and sympathetic stimulation. - It can be a useful alternative when conventional bronchodilators fail to relieve severe bronchospasm. *For analgesia & sedation* - **Ketamine** is widely used for both **analgesia** and **sedation**, particularly in emergency medicine and procedural sedation. - It provides **dissociative anesthesia**, profound pain relief, and maintenance of airway reflexes, making it a valuable agent. *Obstetric hemorrhage* - **Ketamine** can be safely used in **obstetric hemorrhage** as it maintains **uterine tone** and does not relax the uterus, unlike many other anesthetic agents. - This property makes it a preferred choice for anesthesia in parturients with significant bleeding or during Cesarean sections where uterine contraction is crucial.

Question 9: Subarachnoid block as anaesthesia is contraindicated in –

A. Atherosclerotic gangrene
B. Diabetic gangrene
C. Buerger's disease
D. Hemophilia (Correct Answer)

Explanation: ***Hemophilia*** - Subarachnoid block, which involves puncturing the dura, is contraindicated in patients with **hemophilia** due to the high risk of **spinal hematoma**. - A spinal hematoma can lead to **cord compression** and devastating neurological deficits. *Atherosclerotic gangrene* - This condition involves **peripheral vascular disease** and tissue necrosis, but does not inherently contraindicate subarachnoid block. - In fact, subarachnoid block can be beneficial by providing **sympathectomy**, improving blood flow to the affected limb. *Diabetic gangrene* - Similar to atherosclerotic gangrene, **diabetic gangrene** is a manifestation of peripheral vascular disease often complicated by neuropathy and infection. - There is no direct contraindication to subarachnoid block for this condition itself, provided there are no concurrent coagulopathies or active infections at the needle insertion site. *Buerger's disease* - **Buerger's disease** (thromboangiitis obliterans) is an inflammatory vasculitis of small and medium-sized arteries and veins, primarily in the limbs. - Subarachnoid block may even be indicated to improve blood flow by inducing **sympathectomy**, helping relieve ischemic pain or prevent further tissue damage.

Question 10: Which of the following is NOT a treatment for supraventricular tachycardia with hypotension in a patient under general anesthesia?

A. Carotid sinus massage
B. Adenosine 3-12 mg IV
C. Direct current cardioversion
D. Verapamil 5 mg IV (Correct Answer)

Explanation: ### Explanation The management of intraoperative supraventricular tachycardia (SVT) depends primarily on the patient's **hemodynamic stability**. **1. Why Verapamil is the Correct Answer (The "NOT" treatment):** In a patient with SVT and **hypotension** (hemodynamic instability), calcium channel blockers like Verapamil are **contraindicated**. Verapamil has potent negative inotropic and vasodilator properties. Administering it to a hypotensive patient can cause a further drop in systemic vascular resistance and myocardial contractility, potentially leading to cardiovascular collapse or cardiac arrest. **2. Analysis of Other Options:** * **Direct Current (DC) Cardioversion (Option C):** This is the **treatment of choice** for any tachyarrhythmia causing hemodynamic instability (hypotension, altered mentation, or pulmonary edema) under general anesthesia. Synchronized cardioversion (starting at 50-100J) provides immediate rhythm correction. * **Adenosine (Option B):** If the patient is unstable but IV access is immediately available, Adenosine (6mg, then 12mg) can be attempted as it has an ultra-short half-life and may terminate the reentry circuit without prolonged hemodynamic depression. * **Carotid Sinus Massage (Option A):** This is a non-invasive vagal maneuver that can be attempted quickly to increase vagal tone and slow AV node conduction while preparing for cardioversion. **Clinical Pearls for NEET-PG:** * **Unstable Tachycardia:** Always choose **Synchronized DC Cardioversion**. * **Stable SVT:** First-line is Vagal maneuvers, followed by Adenosine (Drug of Choice). * **Verapamil Warning:** Never give Verapamil in wide-complex tachycardias of unknown origin or in patients with WPW syndrome + Atrial Fibrillation, as it can lead to ventricular fibrillation. * **Amiodarone:** Preferred for stable ventricular tachycardia or refractory SVT.

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