Anesthesia for Interventional Cardiology Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Anesthesia for Interventional Cardiology. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Anesthesia for Interventional Cardiology Indian Medical PG Question 1: Which anesthetic agent is considered the least cardiotoxic?
- A. Isoflurane
- B. Enflurane
- C. Sevoflurane (Correct Answer)
- D. Halothane
Anesthesia for Interventional Cardiology Explanation: ***Sevoflurane***
- Sevoflurane is known for its **smooth induction** and rapid recovery, making it a common choice, especially in pediatric anesthesia [3].
- It has a relatively **low pungency** and minimal cardiovascular depressant effects compared to other volatile anesthetics, contributing to its favorable cardiotoxicity profile [1], [4].
*Enflurane*
- Enflurane can cause **myocardial depression** and may induce **seizures** at higher concentrations, limiting its use [1].
- Its widespread use has decreased due to concerns about its **cardiovascular effects** and potential for **renal toxicity**.
*Isoflurane*
- While Isoflurane is a commonly used anesthetic, it can cause **coronary steal phenomenon** in patients with coronary artery disease due to its potent vasodilatory effects.
- It also causes dose-dependent **myocardial depression** and can increase heart rate, which may be detrimental in some patients [4].
*Halothane*
- Halothane is known for significant **myocardial depression**, causing a decrease in cardiac output and systemic vascular resistance [2].
- It also sensitizes the myocardium to **catecholamines**, increasing the risk of arrhythmias, and is associated with **halothane hepatitis**, a rare but severe liver injury [3].
Anesthesia for Interventional Cardiology Indian Medical PG Question 2: MC late complication of central venous line is:
- A. Sepsis (Correct Answer)
- B. Thromboembolism
- C. Cardiac arrhythmias
- D. Air embolism
Anesthesia for Interventional Cardiology Explanation: **Sepsis**
- **Catheter-related bloodstream infections (CRBSIs)** are the most common late complication of central venous lines, leading to sepsis [1].
- The risk of sepsis increases with the **duration** of catheter placement, frequency of line access, and inadequate aseptic technique [1].
*Air embolism*
- An **air embolism** is typically an immediate or early complication during insertion or removal of the central line, or connection/disconnection of administration sets.
- It is not considered a late complication as it occurs due to a sudden entry of air into the venous system.
*Thromboembolism*
- While **thrombosis** can complicate central venous lines, leading to potential thromboembolism, it is less common than sepsis as a late complication [2].
- The formation of a thrombus is often localized to the catheter tip or vessel wall and may or may not lead to a symptomatic embolism [2].
*Cardiac arrhythmias*
- **Cardiac arrhythmias** can occur during central venous line insertion if the guidewire or catheter tip irritates the myocardium, making it an immediate or early complication.
- This is usually a transient event and not a long-term or late complication associated with the mere presence of the catheter.
Anesthesia for Interventional Cardiology Indian Medical PG Question 3: The most sensitive and practical technique for detection of myocardial ischemia in the perioperative period is -
- A. Direct measurement of end diastolic pressure
- B. Radio labeled lactate determination
- C. Magnetic Resonance Spectroscopy
- D. Regional wall motion abnormality detected with the help of 2D transoesophageal echocardiography (Correct Answer)
Anesthesia for Interventional Cardiology Explanation: ***Regional wall motion abnormality detected with the help of 2D transesophageal echocardiography***
- **Transesophageal echocardiography (TEE)** provides high-resolution images of the heart, allowing for the sensitive detection of **regional wall motion abnormalities (RWMA)**, an early and practical indicator of myocardial ischemia in the perioperative setting.
- The development of new or worsening RWMA is often the **first sign of ischemia**, preceding ECG changes or hemodynamic alterations, making it a highly sensitive and clinically useful tool.
*Direct measurement of end-diastolic pressure*
- While an elevated **end-diastolic pressure** can indicate ventricular dysfunction, it is an **indirect sign** and not specific enough for early myocardial ischemia detection.
- This measurement often requires invasive monitoring, which is less practical for routine detection compared to TEE.
*Radio-labeled lactate determination*
- **Lactate production** can increase in ischemic tissue, but its detection is a **biochemical marker** that typically lags behind the onset of ischemia.
- This technique is generally **research-oriented** and not a practical, bedside method for rapid perioperative ischemia detection.
*Magnetic Resonance Spectroscopy*
- **Magnetic Resonance Spectroscopy (MRS)** can provide detailed metabolic information about tissue, including changes related to ischemia.
- However, it is a **complex, time-consuming, and expensive imaging modality** that is not practical for routine, real-time perioperative monitoring of myocardial ischemia.
Anesthesia for Interventional Cardiology Indian Medical PG Question 4: A patient is on follow-up for recurrent abdominal pain. USG reveals an aortic aneurysm of 40 mm. What should be the next immediate step?
- A. Establish surveillance protocol with repeat imaging in 6-12 months. (Correct Answer)
- B. Initiate medical management with beta-blockers.
- C. Perform surgical intervention immediately.
- D. Start antihypertensive therapy immediately.
Anesthesia for Interventional Cardiology Explanation: ***Establish surveillance protocol with repeat imaging in 6-12 months.***
- A **40mm abdominal aortic aneurysm (AAA)** is below the threshold for elective surgical repair (typically **55mm for men, 50mm for women**).
- The **immediate next step** is to establish a **surveillance protocol** with repeat imaging at appropriate intervals (every **6-12 months** for 40-44mm AAAs).
- Surveillance allows monitoring of aneurysm growth rate and timely intervention if it expands to surgical threshold or becomes symptomatic.
- **Risk factor modification** (smoking cessation, BP control, statin therapy) should accompany surveillance but is secondary to establishing the monitoring plan.
*Initiate medical management with beta-blockers.*
- **Beta-blockers are NOT recommended** for AAA management and may actually be harmful by reducing aortic wall stress detection.
- Current guidelines do not support routine pharmacological therapy specifically to prevent AAA expansion, though **statins** may have some benefit.
*Perform surgical intervention immediately.*
- A **40mm AAA is well below surgical threshold** and does not require immediate intervention.
- Surgery is considered when AAA reaches **≥55mm (men) or ≥50mm (women)**, growth rate **>10mm/year**, or when **symptomatic/ruptured**.
*Start antihypertensive therapy immediately.*
- While **blood pressure control is important** in AAA management, it is not the immediate next step without first establishing a surveillance protocol.
- Antihypertensive therapy should be part of overall cardiovascular risk management but assumes the patient is hypertensive (not specified in the question).
Anesthesia for Interventional Cardiology Indian Medical PG Question 5: During cesarean section under general endotracheal anaesthesia, venous air embolism
- A. Induces severe hypertension
- B. Is associated with decreased end-tidal CO2 (Correct Answer)
- C. Should be treated with nitrous oxide
- D. Is associated with high end-tidal CO2
Anesthesia for Interventional Cardiology Explanation: ***Is associated with decreased end-tidal CO2***
- Venous air embolism causes **pulmonary artery obstruction**, leading to ventilation-perfusion mismatch and decreased blood flow to the lungs.
- This reduced pulmonary blood flow results in a significant **decrease in expired CO2**, as less CO2 is delivered to the alveoli for exhalation.
*Induces severe hypertension*
- Venous air embolism typically causes **hypotension** due to reduced cardiac output and right ventricular failure, not hypertension.
- Direct effects of air in the circulation include **vasodilation** and myocardial depression, contributing to a drop in blood pressure.
*Should be treated with nitrous oxide*
- **Nitrous oxide** should be avoided in cases of venous air embolism as it expands gas-filled spaces, potentially increasing the size of the air embolus and worsening patient outcomes.
- Treatment involves 100% oxygen, Trendelenburg position, left lateral decubitus, and aspiration of air from the right atrium, not the administration of additional gas.
*Is associated with high end-tidal CO2*
- A high end-tidal CO2 would indicate improved ventilation or perfusion, which is contrary to the effects of a venous air embolism that **reduces pulmonary blood flow** and thus CO2 exchange.
- The hallmark respiratory sign of venous air embolism is a **sudden profound decrease in end-tidal CO2** due to arterial obstruction.
Anesthesia for Interventional Cardiology Indian Medical PG Question 6: A patient after valve replacement will require follow up treatment with
- A. ACE inhibitors
- B. Beta blockers
- C. Thiazide
- D. Warfarin (Correct Answer)
Anesthesia for Interventional Cardiology Explanation: ***Warfarin***
- Patients with **mechanical prosthetic heart valves** require lifelong anticoagulation with **warfarin** to prevent life-threatening thromboembolic complications [1].
- The target **international normalized ratio (INR)** typically ranges from 2.5 to 3.5, depending on the valve type and position.
*ACE inhibitors*
- **ACE inhibitors** are primarily used for managing **hypertension**, **heart failure**, and **renal protection**, not as routine post-valve replacement prophylaxis [2].
- While they may be used if these co-morbidities exist, they are not a universal requirement after valve surgery.
*Beta blockers*
- **Beta blockers** are often prescribed to control heart rate, manage **hypertension**, or reduce myocardial oxygen demand, but they are not the primary follow-up treatment for all valve replacement patients.
- They do not address the critical need for **anticoagulation** in mechanical valve recipients.
*Thiazide*
- **Thiazide diuretics** are used to treat **hypertension** and **edema** by increasing salt and water excretion.
- They do not play a direct role in preventing **thromboembolism** post-valve replacement and are not generally indicated unless chronic heart failure or hypertension is present.
Anesthesia for Interventional Cardiology Indian Medical PG Question 7: Abbreviated laparotomy done for:
- A. Hemodynamically stable patients with minor trauma
- B. Damage control in hemodynamically unstable trauma patients (Correct Answer)
- C. Elective abdominal surgeries
- D. Early wound healing promotion
Anesthesia for Interventional Cardiology Explanation: ***Damage control in hemodynamically unstable trauma patients***
- **Abbreviated laparotomy** is a key component of **damage control surgery**, primarily indicated for hemodynamically unstable trauma patients.
- The goal is to rapidly control life-threatening issues like hemorrhage and contamination, then temporarily close the abdomen for physiologic stabilization before definitive repair.
*Hemodynamically stable patients with minor trauma*
- These patients typically do not require prompt surgical intervention; their injuries can often be managed non-operatively or with standard surgical techniques.
- An abbreviated laparotomy is an aggressive approach reserved for severe, life-threatening scenarios, not minor trauma in stable patients.
*Elective abdominal surgeries*
- Elective surgeries are planned procedures performed on stable patients with no immediate life-threatening conditions.
- They allow for complete surgical repair in a single setting, which is the opposite of the staged approach of an abbreviated laparotomy.
*Early wound healing promotion*
- The focus of an abbreviated laparotomy is on resuscitation and source control, not primarily on wound healing.
- The initial closure is temporary, often leaving the wound open, which is not conducive to early, primary wound healing.
Anesthesia for Interventional Cardiology Indian Medical PG Question 8: Problems which may result from hypotensive anesthesia include:
- A. Deep vein thrombosis
- B. Reactionary hemorrhage
- C. Retraction anemia
- D. All of the options (Correct Answer)
Anesthesia for Interventional Cardiology Explanation: ***All of the options***
- Hypotensive anesthesia is a technique used to reduce **blood pressure** during surgery, aiming to decrease **blood loss** and improve the **surgical field visibility**.
- While beneficial, it carries inherent risks including **deep vein thrombosis (DVT), reactionary hemorrhage**, and complications like **retraction anemia** if not managed properly.
*Deep vein thrombosis (DVT)*
- While hypotension might seem to reduce the risk by lowering **blood flow velocity**, prolonged immobility and potential for **venous stasis** during any surgery, especially under hypotension, can increase DVT risk.
- The combination of **endothelial dysfunction** and **hypercoagulability** often seen in surgical patients, coupled with reduced peripheral blood flow due to hypotension, can contribute to DVT formation.
*Reactionary hemorrhage*
- This is a common post-operative complication where bleeding restarts hours after surgery. With hypotensive anesthesia, **blood vessels** are constricted and may not be actively bleeding during the surgery.
- As the patient's **blood pressure** returns to normal post-operatively, these previously undetected bleeds can manifest as significant **hemorrhage** due to the increased pressure.
*Retraction anemia*
- This term is less commonly used in medical literature. However, it likely refers to the complications arising from prolonged tissue retraction during surgery, which, when combined with reduced **perfusion** from hypotensive anesthesia, can lead to **tissue ischemia** or damage akin to anemia in the affected area.
- The reduced **oxygen delivery** to tissues during hypotensive states, especially when further compromised by retraction, may result in localized tissue injury or contribute to systemic complications if severe or prolonged.
Anesthesia for Interventional Cardiology Indian Medical PG Question 9: Which of the following is not a component of the Goldman Revised Cardiac Risk Index?
- A. History of preoperative treatment with insulin
- B. History of preoperative serum creatinine >2.0 mg/dL
- C. Age > 80 yrs (Correct Answer)
- D. History of ischemic heart disease
Anesthesia for Interventional Cardiology Explanation: ***Age > 80 yrs***
- **Age** is not a parameter included in the Goldman Revised Cardiac Risk Index for predicting postoperative cardiac complications.
- The index focuses on specific medical conditions and surgical risk factors.
*History of preoperative treatment with insulin*
- This is a component of the **Goldman Revised Cardiac Risk Index**, indicating **insulin-dependent diabetes mellitus**.
- Diabetes requiring insulin treatment is a significant risk factor for cardiac complications during surgery.
*History of preoperative serum creatinine >2.0 mg/dL*
- An elevated **serum creatinine** (>2.0 mg/dL) is a recognized component of the index, reflecting **renal insufficiency**.
- **Renal impairment** is associated with increased cardiac risk in the perioperative period.
*History of ischemic heart disease*
- This is a key component of the Goldman Revised Cardiac Risk Index, as a history of **ischemic heart disease** (e.g., prior myocardial infarction, angina) significantly increases perioperative cardiac risk.
- Patients with existing heart disease are more susceptible to cardiac events during and after surgery.
Anesthesia for Interventional Cardiology Indian Medical PG Question 10: Patient shows ST depression, troponin rise 6h post-surgery. Next best step is:
- A. 12-lead ECG
- B. Echocardiogram
- C. Cardiology consult (Correct Answer)
- D. Start heparin
Anesthesia for Interventional Cardiology Explanation: ***Cardiology consult***
- A cardiology consult is the most appropriate next step given the presence of **ST depression** and a **troponin rise** post-surgery, indicating a likely myocardial infarction (MI).
- This allows for prompt comprehensive evaluation, risk stratification, and initiation of specialized cardiac management by an expert.
*12-lead ECG*
- While a 12-lead ECG is an important diagnostic tool, the patient's existing **ST depression** suggests it has already been performed or noted.
- A repeat ECG might be useful for tracking changes, but it doesn't replace the need for expert cardiac evaluation and management.
*Echocardiogram*
- An echocardiogram can assess **cardiac function**, wall motion abnormalities, and valvular issues, which are relevant in MI.
- However, it's a diagnostic test that should be ordered and interpreted in the context of a broader cardiac workup, which a cardiologist can best coordinate.
*Start heparin*
- **Heparin** is an anticoagulant that may be part of the management for an MI, especially in certain types or for prevention of clot extension.
- However, initiating anticoagulation should be done after a thorough assessment of the patient's cardiac status, bleeding risk post-surgery, and in consultation with cardiology, rather than as the immediate next best step.
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