Preoperative Evaluation and Management — MCQs

Preoperative Evaluation and Management Indian Medical PG Practice Questions and MCQs

Question 131: A 50 year old male is posted for elective laparoscopic cholecystectomy. No history of comorbidities. His surgery is scheduled at 2 PM on the day of surgery. Which of the following is against the ASA guidelines for preoperative fasting

A. Water at 12:00 PM
B. Black coffee at 5:30 AM
C. Pancakes at 10:00 AM (Correct Answer)
D. A non-clear liquid (e.g., orange juice) at 7:30 AM

Explanation: **Pancakes at 10:00 AM** - According to ASA guidelines, the fasting period for solid food is typically **6-8 hours** before surgery. Eating pancakes, which are solid food, at 10:00 AM for a 2:00 PM surgery (4-hour interval) violates this guideline. - This short fasting period for solids increases the risk of **pulmonary aspiration** during induction of anesthesia. *Water at 12:00 PM* - Water is considered a clear liquid, and ASA guidelines typically allow clear liquids until **2 hours** before surgery. Drinking water at 12:00 PM for a 2:00 PM surgery is within these guidelines. - Rapid gastric emptying of clear liquids minimizes the risk of aspiration. *Black coffee at 5:30 AM* - Black coffee is considered a clear liquid, and it is consumed well within the **2-hour** fasting window for clear liquids before a 2:00 PM surgery. - The absence of milk or cream ensures it is treated as a clear liquid, which empties quickly from the stomach. *A non-clear liquid (e.g., orange juice) at 7:30 AM* - Non-clear liquids, such as orange juice, are treated similarly to light meals and generally require a fasting period of **6 hours** before surgery. Drinking orange juice at 7:30 AM for a 2:00 PM surgery (6.5-hour interval) is compliant with these guidelines. - The protein and pulp in non-clear liquids delay gastric emptying compared to clear liquids.

Question 132: A patient was scheduled for surgery. Before giving anaesthesia, he was administered glycopyrrolate. What is rationale of giving glycopyrrolate before anaesthesia?

A. For muscle relaxation
B. As inducing agent
C. To decrease secretions (Correct Answer)
D. To allay anxiety

Explanation: ***To decrease secretions*** - Glycopyrrolate is an **anticholinergic drug** that blocks muscarinic receptors, thereby **inhibiting glandular secretions**, particularly salivary and bronchial secretions. - Reducing these secretions before anesthesia helps prevent aspiration of fluids into the lungs and improves visibility for airway management. *For muscle relaxation* - Muscle relaxants like **succinylcholine** or **rocuronium** are used for muscle relaxation during surgery, not glycopyrrolate. - Glycopyrrolate has no significant effect on skeletal muscle function. *As inducing agent* - Inducing agents, such as **propofol** or **etomidate**, are used to rapidly induce unconsciousness for surgery. - Glycopyrrolate does not possess sedative or hypnotic properties to induce anesthesia. *To allay anxiety* - **Benzodiazepines** like midazolam are commonly used as pre-operative anxiolytics to reduce patient anxiety. - While glycopyrrolate can have some CNS effects, its primary role in the pre-anesthetic setting is not anxiety reduction.

Question 133: A 65-year-old diabetic patient is scheduled for elective hernia repair. Which factor should be monitored closely during anesthesia?

A. Blood glucose levels (Correct Answer)
B. Serum potassium levels
C. Serum calcium levels
D. Arterial blood gases

Explanation: ***Blood glucose levels*** - Diabetic patients are prone to **hyperglycemia or hypoglycemia** during surgery due to stress response, altered metabolic needs, and anesthetic agents. - Close monitoring ensures glycemic control, preventing complications like delayed wound healing, infection, and neurological damage. *Serum potassium levels* - While electrolyte imbalances can occur, **potassium abnormalities** are not as directly or immediately impacted by surgery and anesthesia in a typically controlled diabetic as glucose levels. - Significant potassium shifts usually require specific interventions or pre-existing renal issues, which are not highlighted as the primary concern here. *Serum calcium levels* - **Calcium levels** are generally stable in the perioperative period unless there's a pre-existing parathyroid disorder or massive transfusions, which are not indicated for routine hernia repair. - Dysregulation of calcium is less common and less critical for immediate monitoring compared to glucose in a diabetic patient during surgery. *Arterial blood gases* - **Arterial blood gases (ABGs)** provide information on oxygenation, ventilation, and acid-base status, which are important in complex surgeries or patients with significant respiratory compromise. - For an elective hernia repair in a diabetic, **glucose control** is a more specific and immediate concern directly related to their underlying condition than routine ABG monitoring.

Question 134: In a patient with end-stage renal disease undergoing surgery, which anesthetic agent requires the most careful consideration regarding dosing and monitoring?

A. Propofol (Correct Answer)
B. Etomidate
C. Ketamine
D. Sevoflurane

Explanation: ***Propofol*** - While propofol itself is primarily metabolized in the liver, its **excipient, lipid emulsion**, can contribute to hypertriglyceridemia and fluid overload, which are significant concerns in **end-stage renal disease (ESRD)** patients. - Its high protein binding can be altered in uremia, potentially increasing the **free drug concentration** and enhancing its effects, requiring careful titration. *Etomidate* - Etomidate is primarily metabolized by **hepatic enzymes and plasma esterases** into inactive metabolites, with minimal renal excretion of the parent drug. - Its use can lead to **adrenal suppression** by inhibiting 11-beta-hydroxylase, a concern in critically ill patients but not directly related to renal clearance in ESRD. *Ketamine* - Ketamine is metabolized by the **liver** via N-demethylation to **norketamine**, which has some anesthetic activity but is primarily excreted renally. - While its metabolites are renally cleared, the **parent drug** itself is largely unaffected by renal impairment, and its hemodynamic stability can be advantageous in ESRD. *Sevoflurane* - Sevoflurane is primarily eliminated via the **lungs**, with very minimal metabolism in the liver. - However, its metabolism produces **compound A**, which can be nephrotoxic in animals (though less so in humans) and its accumulation is a theoretical concern in severely compromised kidneys, but it's not a primary factor affecting dosing in ESRD.

Question 135: What is the primary purpose of preoperative fasting?

A. To prevent dehydration
B. To reduce the risk of aspiration (Correct Answer)
C. To improve anesthetic efficacy
D. To increase postoperative comfort

Explanation: **To reduce the risk of aspiration** - The primary purpose of **preoperative fasting** is to ensure the stomach is empty, thereby minimizing the risk of **pulmonary aspiration** of gastric contents during anesthesia. - Aspiration can lead to severe complications such as **pneumonitis**, ARDS, and even death. *To prevent dehydration* - While prolonged fasting in some situations could contribute to dehydration, the standard fasting guidelines are specifically designed to balance the risk of aspiration with the need to avoid significant dehydration. - Dehydration is a concern, but it is a secondary consideration compared to the immediate, life-threatening risk of aspiration. *To improve anesthetic efficacy* - Fasting does not directly improve the efficacy of anesthetic agents, meaning it doesn't make them work better or more predictably. - The type and dosage of anesthetics are determined by patient factors and surgical needs, not by fasting status. *To increase postoperative comfort* - Preoperative fasting does not inherently increase postoperative comfort; in fact, a prolonged period without food or drink might contribute to thirst or hunger postoperatively. - Postoperative comfort is mainly managed through pain control and antiemetics, which are separate from fasting protocols.

Question 136: A patient with a history of chronic renal failure presents for preoperative evaluation. What is the most important consideration in selecting anesthetic agents for this patient?

A. Use agents that are metabolized by the liver
B. Avoid agents that are primarily excreted by the kidneys (Correct Answer)
C. Select agents with a short half-life
D. Use agents that provide analgesia and sedation

Explanation: ***Avoid agents that are primarily excreted by the kidneys*** - Patients with **chronic renal failure** have impaired kidney function, leading to delayed excretion and accumulation of renally cleared drugs and their active metabolites. This can result in prolonged drug effects and increased toxicity. - Anesthetic agents and their metabolites that are primarily excreted by the kidneys should be avoided or used with extreme caution with **reduced dosages** to prevent adverse outcomes. *Use agents that are metabolized by the liver* - While using **liver-metabolized** agents is generally preferred in renal failure, it is not the *most important* consideration, as some liver-metabolized drugs can still produce active metabolites that are renally excreted. - The liver's metabolic capacity may also be affected by systemic illness associated with **chronic renal failure**, making simple reliance on hepatic metabolism insufficient. *Select agents with a short half-life* - A short half-life is desirable for any anesthetic agent to allow for rapid recovery and titration, but it doesn't directly address the problem of **renal accumulation** if the excretion pathway is impaired. - Even agents with a short half-life can accumulate if their primary elimination route is significantly compromised, leading to **prolonged drug effects**. *Use agents that provide analgesia and sedation* - **Analgesia and sedation** are essential components of anesthesia but represent the therapeutic goals rather than the primary consideration for drug *selection* in the context of renal failure. - The choice of agents to achieve these goals must still prioritize **pharmacokinetic properties** suitable for patients with compromised renal function.

Question 137: A patient with chronic kidney disease is undergoing surgery. Which induction agent should be used with caution?

A. Propofol
B. Ketamine
C. Thiopental (Correct Answer)
D. Etomidate

Explanation: ***Thiopental*** - Thiopental is primarily metabolized by the liver, but its metabolites are **renally excreted**. In patients with **chronic kidney disease (CKD)**, these metabolites can accumulate, leading to prolonged sedation and delayed emergence from anesthesia. - Thiopental also causes **vasodilation** and **myocardial depression**, which can be poorly tolerated in CKD patients who often have underlying cardiovascular compromise. *Propofol* - Propofol is rapidly metabolized by the **liver** into inactive metabolites, with minimal renal excretion of the active drug. This makes it a generally safe choice for induction in patients with **CKD**. - It provides a smooth induction and rapid recovery, and its **hemodynamic effects** are predictable and manageable. *Ketamine* - Ketamine is metabolized by the liver into active and inactive metabolites, with subsequent renal excretion. While **some renal excretion** of metabolites occurs, it is generally considered safe for induction in CKD patients at usual doses. - Ketamine tends to **maintain blood pressure** and heart rate, which can be beneficial in patients with cardiovascular instability, often seen in CKD. *Etomidate* - Etomidate is primarily metabolized by **hepatic enzymes** into inactive metabolites, which are then renally excreted. Its pharmacokinetics are largely unaffected by renal impairment, making it generally safe for induction in CKD patients. - It provides **hemodynamic stability**, which is particularly advantageous in patients with compromised cardiovascular function or significant volume depletion.

Question 138: A 40-year-old male with a history of chronic alcohol use disorder is scheduled for elective surgery. What is the most important perioperative consideration for this patient?

A. Risk of alcohol withdrawal (Correct Answer)
B. Hypoglycemia management
C. Electrolyte imbalance correction
D. Vitamin K administration

Explanation: ***Risk of alcohol withdrawal*** - Patients with **chronic alcohol use disorder** are at very high risk for developing serious **alcohol withdrawal symptoms** during the perioperative period, especially if drinking is abruptly stopped. - Alcohol withdrawal can manifest as **tremors, hallucinations, seizures, and delirium tremens**, which can be life-threatening and complicate surgical recovery. *Hypoglycemia management* - While chronic alcohol use can affect glucose metabolism, **hypoglycemia** is a less common and less immediately life-threatening perioperative complication compared to acute alcohol withdrawal. - **Hyperglycemia** is also a concern due to stress response, requiring monitoring, but withdrawal remains the primary acute risk. *Electrolyte imbalance correction* - **Electrolyte imbalances** (e.g., hypokalemia, hypomagnesemia) are common in chronic alcohol use and require correction. - However, the acute and severe complications of **alcohol withdrawal** typically pose a more urgent and significant perioperative risk than electrolyte abnormalities alone. *Vitamin K administration* - **Vitamin K deficiency** can occur due to malnutrition and liver dysfunction in chronic alcohol users, leading to coagulopathy. - While important for preventing **bleeding complications**, addressing the potential for severe, acute alcohol withdrawal is generally considered the most critical initial perioperative concern.

Question 139: A 70-year-old patient with a history of hypertension and diabetes is scheduled for elective surgery. Which preoperative test is most appropriate for assessing his risk of perioperative complications?

A. LFTs
B. ECG (Correct Answer)
C. Chest X-ray
D. CBC

Explanation: ***ECG*** - An **ECG** is crucial for patients with a history of **hypertension** and **diabetes** as these conditions significantly increase the risk of undetected cardiac disease. - It helps identify **silent ischemia**, arrhythmias, left ventricular hypertrophy, and other cardiac abnormalities that could lead to perioperative complications like **myocardial infarction** or **cardiac arrest**. *Chest X-ray* - A chest X-ray is generally not routinely recommended for all preoperative patients. It is typically reserved for those with current respiratory symptoms, known pulmonary disease, or significant cardiac disease. - While helpful for identifying pulmonary issues, it does not directly assess the cardiac risk in the same way an ECG does for a patient with hypertension and diabetes. *CBC* - A **complete blood count (CBC)** assesses for **anemia**, infection, or clotting disorders, which are important general health indicators. - While important for surgical planning, a CBC does not specifically evaluate the **cardiovascular risk** associated with hypertension and diabetes. *LFTs* - **Liver function tests (LFTs)** evaluate liver health, which is important for drug metabolism and overall physiological function, especially if liver disease is suspected. - LFTs are not the primary test for assessing **cardiovascular risk** in a patient with hypertension and diabetes before surgery.

Question 140: A 45-year-old male patient with a history of COPD presents for elective surgery. Which of the following is the most appropriate step in preoperative management?

A. Continue bronchodilators and steroids (Correct Answer)
B. Discontinue bronchodilators
C. Switch to intravenous steroids
D. Administer a stress dose of hydrocortisone

Explanation: ***Continue bronchodilators and steroids*** - Maintaining bronchodilator and steroid therapy is crucial to optimize pulmonary function and prevent **exacerbations** in a patient with **COPD** undergoing surgery. - This approach minimizes the risk of **postoperative respiratory complications** such as bronchospasm and pneumonia. *Discontinue bronchodilators* - Discontinuing bronchodilators would increase the risk of **bronchospasm** and worsening **airflow limitation** during and after surgery. - This could lead to severe respiratory distress and prolong recovery. *Switch to intravenous steroids* - Switching to intravenous steroids is generally not necessary unless the patient is experiencing an acute COPD exacerbation or has severe systemic inflammation. - Oral or inhaled steroids are typically sufficient for maintenance therapy. *Administer a stress dose of hydrocortisone* - A stress dose of hydrocortisone is typically given to patients who have been on chronic systemic steroids to prevent **adrenal insufficiency** during the stress of surgery. - While this might be considered if the patient is on chronic oral steroids, continuing current bronchodilator-steroid therapy is the primary step for optimizing lung function, and a stress dose is a separate consideration for adrenal axis suppression.

Practice by Chapter

Preoperative Assessment Framework

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ASA Physical Status Classification

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Preoperative Laboratory Testing

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Cardiovascular Evaluation

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Pulmonary Evaluation

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Assessment of the Difficult Airway

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Medication Management

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NPO Guidelines

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Perioperative Anticoagulation Management

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Premedication

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Informed Consent

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Risk Stratification

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