Preoperative Evaluation and Management Practice Questions

Q: 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?

History + c/e + routine labs + stress test. ***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.

Q: Modified Mallampati grading is used in assessment of -

Difficulty of intubation. ***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.

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

Soft palate and base of uvula visible. **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.

Q: Preanaesthetic medication glycopyrrolate is primarily used for:

Decrease secretion. ***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 1

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

Accepted Answer

Caution with nitrous oxide use

Answer

Use of short-acting agents

Answer

Preoperative fasting of 12 hours

Answer

Standard doses of muscle relaxants based on actual body weight

Question 2

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?

Accepted Answer

History + c/e + routine labs + stress test

Answer

History + c/e + routine labs + V/Q scan

Answer

History + c/e + routine labs

Answer

History + c/e + routine labs + angiography to assess graft patency

Question 3

Modified Mallampati grading is used in assessment of -

Accepted Answer

Difficulty of intubation

Answer

Obstruction of the airway

Answer

Aspiration-related death

Answer

Endotracheal intubation procedure

Question 4

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

Accepted Answer

Soft palate and base of uvula visible

Answer

Limited neck extension

Answer

An enlarged epiglottis

Answer

Jaw stiffness

Question 5

Preanaesthetic medication glycopyrrolate is primarily used for:

Accepted Answer

Decrease secretion

Answer

Antisialagogue effect

Answer

Prevent aspiration

Answer

Reduce bronchial secretions

Question 6

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?

Accepted Answer

Continue ACE inhibitors until the morning of surgery

Answer

Switch to a beta-blocker 48 hours before surgery

Answer

No changes needed in his medication regimen

Answer

Discontinue ACE inhibitors 24 hours prior to surgery to avoid hypotension.

Preoperative Evaluation and Management — MCQs

Preoperative Evaluation and Management — MCQs

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