Preoperative Evaluation and Management — MCQs

Preoperative Evaluation and Management Indian Medical PG Practice Questions and MCQs

Question 141: A 50-year-old male with severe obesity is scheduled for bariatric surgery. Which anesthetic consideration is crucial for this patient?

A. Use of short-acting agents
B. Caution with nitrous oxide use (Correct Answer)
C. Preoperative fasting of 12 hours
D. Standard doses of muscle relaxants based on actual body weight

Explanation: ***Caution with nitrous oxide use*** - **Nitrous oxide** can expand closed air spaces, such as those that may be present within the bowel of bariatric patients due to increased intra-abdominal pressure or surgical manipulation, potentially leading to **bowel distension** and surgical complications. - Bariatric patients often have compromised respiratory function and increased risk for **gastroesophageal reflux**, making the avoidance of agents that can worsen gas accumulation and pressure surges important. *Use of short-acting agents* - While short-acting agents are generally preferred for better control and faster emergence, this is a consideration for most surgeries and not specific to the **crucial anesthetic management** of severe obesity for bariatric surgery. - The impact of obesity on drug distribution and metabolism means that clearance of even short-acting agents might be altered, requiring careful titration rather than just choosing short-acting drugs. *Preoperative fasting of 12 hours* - Bariatric patients typically have **delayed gastric emptying** and increased gastric volume and acidity, which increases the risk of aspiration. - Current guidelines often recommend a shorter, not longer, fasting period (e.g., 6 hours for solids, 2 hours for clear liquids) to reduce hunger and thirst, often accompanied by gastric acid suppressants, but 12 hours is generally not indicated and may contribute to discomfort and metabolic stress. *Standard doses of muscle relaxants based on actual body weight* - Most **hydrophilic muscle relaxants** (e.g., rocuronium, vecuronium) should be dosed based on **ideal body weight** or **lean body weight** rather than actual body weight in obese patients to avoid over-dosing and prolonged paralysis. - This is because their volume of distribution is not significantly increased by adipose tissue, and dosing by actual body weight can lead to a much higher concentration in the plasma, increasing the duration of action and recovery time.

Question 142: A patient scheduled for elective inguinal hernia surgery has a history of myocardial infarction (MI) and underwent coronary artery bypass grafting (CABG). What should be included in the preoperative assessment?

A. History + c/e + routine labs + V/Q scan
B. History + c/e + routine labs
C. History + c/e + routine labs + stress test (Correct Answer)
D. History + c/e + routine labs + angiography to assess graft patency

Explanation: ***History + c/e + routine labs + stress test*** - A **stress test** is crucial in patients with a history of MI and CABG to assess **myocardial ischemia** and functional capacity, guiding perioperative management. - This evaluation helps determine the patient's **cardiac risk** for non-cardiac surgery and the need for further cardiac optimization. *History + c/e + routine labs + angiography to assess graft patency* - **Coronary angiography** is an invasive procedure and is generally not indicated as a routine preoperative assessment unless there are new, significant cardiac symptoms or signs of **graft dysfunction**. - Assessing graft patency through angiography carries risks and would only be justified if there were strong clinical indications suggesting acute or severe **cardiac ischemia**. *History + c/e + routine labs* - While critical for any preoperative assessment, **routine history, physical examination, and basic laboratory tests** are insufficient for a patient with a significant cardiac history like MI and CABG. - This approach would **underestimate the cardiac risk** and might miss undetected ischemia, leading to adverse perioperative cardiac events. *History + c/e + routine labs + V/Q scan* - A **ventilation-perfusion (V/Q) scan** is primarily used to diagnose **pulmonary embolism** or assess regional lung function. - It does not provide information about myocardial ischemia or cardiac functional capacity, making it **irrelevant** for assessing cardiac risk in this clinical scenario.

Question 143: Modified Mallampati grading is used in assessment of -

A. Difficulty of intubation (Correct Answer)
B. Obstruction of the airway
C. Aspiration-related death
D. Endotracheal intubation procedure

Explanation: ***Difficulty of intubation*** - The **Modified Mallampati score** assesses the visibility of pharyngeal structures, which directly correlates with the ease or difficulty of performing **direct laryngoscopy** and **endotracheal intubation**. - A higher Mallampati class (e.g., III or IV) indicates less visibility of the soft palate, uvula, and pillars, suggesting a more difficult airway and increased likelihood of a challenging intubation. *Obstruction of the airway* - While a high Mallampati score might indirectly indicate potential for **airway obstruction** during anesthesia due to anatomical features, its primary purpose is not to diagnose or quantify existing airway obstruction. - Airway obstruction is more directly assessed by monitoring breathing sounds, respiratory effort, and oxygen saturation. *Aspiration-related death* - The **Mallampati score** helps predict the difficulty of securing the airway but does not directly assess the risk of **aspiration**. - Aspiration risk is evaluated based on factors like gastric contents, gag reflex, and patient positioning. *Endotracheal intubation procedure* - The **Modified Mallampati score** helps in **planning the intubation procedure** by identifying potential difficulties but is not a measure of the intubation procedure itself. - It is a **pre-procedure assessment tool** to gauge airway anatomy, not a description or evaluation of the steps involved in endotracheal intubation.

Question 144: During preanaesthetic evaluation, an anaesthetist wrote a Mallampati grade 3. What does this signify?

A. Limited neck extension
B. An enlarged epiglottis
C. Jaw stiffness
D. Soft palate and base of uvula visible (Correct Answer)

Explanation: **Soft palate and base of uvula visible** - A **Mallampati grade 3** classification indicates that only the **soft palate** and the **base of the uvula** are visible when the patient opens their mouth and protrudes their tongue. - This grade suggests a moderate difficulty for **endotracheal intubation** because the visualization of the glottis may be partially obstructed. *Limited neck extension* - Limited **neck extension** is assessed separately during a preanesthetic evaluation and is not directly indicated by the Mallampati score. - It is a factor that can independently contribute to a difficult airway by limiting the ability to achieve the **sniffing position** for intubation. *An enlarged epiglottis* - The **epiglottis** is not visible during a standard awake Mallampati examination, which assesses oral pharyngeal structures. - Visualization of the epiglottis typically occurs during **laryngoscopy** and an enlarged epiglottis (e.g., in epiglottitis) is a medical emergency, not a Mallampati finding. *Jaw stiffness* - **Jaw stiffness** or limited mouth opening is assessed by measuring the **interincisor distance** and is not directly part of the Mallampati classification process. - Significant jaw stiffness can independently predict a difficult airway by restricting the view during laryngoscopy, even with a favorable Mallampati score.

Question 145: Preanaesthetic medication glycopyrrolate is primarily used for:

A. Decrease secretion (Correct Answer)
B. Antisialagogue effect
C. Prevent aspiration
D. Reduce bronchial secretions

Explanation: ***Decrease secretion*** - Glycopyrrolate is an **anticholinergic drug** that primarily works by blocking muscarinic acetylcholine receptors, thereby reducing glandular secretions throughout the body. - This effect includes reducing **salivary**, **bronchial**, and **gastric secretions**, which is beneficial during anesthesia. *Reduce bronchial secretions* - While glycopyrrolate does **reduce bronchial secretions**, this is a specific aspect of its broader effect of decreasing secretions, making "decrease secretion" a more comprehensive answer. - Reducing bronchial secretions helps in maintaining a **clear airway** and preventing atelectasis. *Prevent aspiration* - By decreasing gastric and salivary secretions, glycopyrrolate can indirectly help to **reduce the risk of aspiration** of gastric contents or saliva into the lungs. - However, preventing aspiration is a beneficial **consequence** of reduced secretions, not the direct pharmacological action described as "decrease secretion." *Antisialagogue effect* - The **antisialagogue effect**, which means reducing saliva production, is a prominent action of glycopyrrolate and is part of its overall secretion-decreasing property. - Reducing salivary secretions creates a **dry operative field** during procedures involving the oral cavity or airway.

Question 146: What is the most appropriate perioperative management regarding the antihypertensive medication of a 55-year-old male with a history of hypertension who has been taking ACE inhibitors for the past 5 years and is scheduled for elective hernia repair surgery?

A. Switch to a beta-blocker 48 hours before surgery
B. Continue ACE inhibitors until the morning of surgery (Correct Answer)
C. No changes needed in his medication regimen
D. Discontinue ACE inhibitors 24 hours prior to surgery to avoid hypotension.

Explanation: ***Continue ACE inhibitors until the morning of surgery*** - While it's common practice to hold ACE inhibitors on the day of surgery to prevent **intraoperative hypotension**, continuing them until the morning of surgery is often acceptable for elective procedures as it minimizes the risk of **rebound hypertension**. - Following the most recent guidelines, for patients undergoing elective non-cardiac surgery, ACE inhibitors can be continued, but it is important to check the specific institutional guidelines as the decision to hold or continue ACE inhibitors often varies based on the patient's individual risk profile and the type of surgery. *Switch to a beta-blocker 48 hours before surgery* - Switching to a beta-blocker acutely before surgery without a clear indication could lead to **uncontrolled hypertension** or other adverse effects if the patient is not accustomed to beta-blockers. - Beta-blockers are generally continued perioperatively if the patient is already taking them, but initiating them immediately before surgery is not a standard recommendation for routine hypertension management. *No changes needed in his medication regimen* - This is incorrect as current guidelines suggest at least some modification, such as holding the ACE inhibitor on the morning of surgery due to the risk of **refractory hypotension** under anesthesia. - ACE inhibitors can interact with anesthetic agents, making blood pressure management more challenging during surgery. *Discontinue ACE inhibitors 24 hours prior to surgery to avoid hypotension.* - While recommended by some older guidelines and for certain high-risk patients, discontinuing ACE inhibitors 24 hours prior is not universally recommended for all elective surgeries as it may increase the risk of **perioperative hypertension** or rebound effects. - The risk of perioperative hypotension with ACE inhibitors is real, however, in an elective setting, the current trend is to hold the dose on the morning of the surgery rather than a day before unless institution specific guidelines explicitly mention it.

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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