FMGE 2024 — Anesthesiology

Q: Which of the following is the use of the Mallampatti classification?

Endotracheal intubation. ***Correct Option C: Endotracheal intubation*** - The Mallampati classification assesses the visibility of the soft palate, uvula, and tonsillar pillars, which directly correlates with the ease of achieving a satisfactory view during **direct laryngoscopy** - It is a critical component of the **pre-anesthetic airway assessment** used alongside thyromental distance and mouth opening to predict difficult airway management and guide intubation strategy - Classes I-IV predict increasing difficulty in intubation, with Class III-IV indicating potentially difficult airways *Incorrect Option A: To evaluate the fitness of the patient* - Patient fitness evaluation involves holistic assessment of **cardiopulmonary reserve** and functional capacity, ensuring the patient can safely tolerate the physiological stress of surgery and anesthesia - Fitness relies on optimizing chronic medical conditions and functional capacity, not just anatomical classification of the airway opening *Incorrect Option B: To evaluate the pros and cons of surgery* - This evaluation is a clinical and ethical judgment based on the patient's **disease severity**, anticipated benefits, potential complications, and mortality associated with the procedure - The Mallampati score does not directly contribute to weighing the overall risk-benefit ratio of the surgical procedure itself *Incorrect Option D: To evaluate the risk of surgery* - Surgical risk is determined using tools like the **ASA physical status classification** (P1-P6), comorbidities, and type of surgery - While a predicted difficult airway (Mallampati class III or IV) increases the **anesthesia-related risk**, it does not comprehensively define the overall surgical risk profile [Practice more Anesthesiology PYQs on OnCourse]

Q: Which of the following is the most common drug used in day care surgery/TIVA?

Propofol. ***Propofol***- **Propofol** is the anesthetic of choice for **TIVA** (Total Intravenous Anesthesia) and day care surgery due to its favorable pharmacokinetics, including rapid onset and smooth awakening.- Its **ultra-short duration of action** and rapid metabolic clearance ensure a quick, clear-headed recovery, which is essential for minimizing post-anesthesia care unit (PACU) time and facilitating early discharge.*Sodium thiopentone*- Although used for induction, **sodium thiopentone** has a longer context-sensitive half-time than propofol, resulting in **slower emergence** and potential for prolonged postoperative drowsiness.- Due to its slower recovery profile and higher risk of **residual sedation**, it is generally not preferred for short procedures in day care settings.*Halothane*- **Halothane** is a volatile **inhalational anesthetic** and, therefore, cannot be used for TIVA, which requires intravenous agents.- Modern volatile agents have largely replaced halothane due to the risk of severe side effects, notably cardiovascular depression and potentially fatal **halothane-induced hepatotoxicity**.*Ketamine*- **Ketamine** provides excellent analgesia and cardiovascular stability (sympathomimetic effects), but it frequently causes **psychomimetic side effects** (emergence delirium, hallucinations) during recovery, which are undesirable in day care.- Full Ketamine anesthesia often requires concurrent use with benzodiazepines (midazolam) to mitigate emergence phenomena, making it less suitable as a sole agent for smooth, rapid day care surgery recovery. [Practice more Anesthesiology PYQs on OnCourse]

Q: Which of the following inhalation agents has a blood-gas partition coefficient similar to nitrous oxide?

Desflurane. ***Correct: Desflurane*** - Desflurane has a **blood-gas partition coefficient** of 0.42, which is the closest value to that of **nitrous oxide (N2O)** (0.47) among the volatile agents listed. - This very low solubility in blood facilitates rapid **wash-in** and **wash-out**, translating to the fastest induction and emergence profiles among potent volatile anesthetics. *Incorrect: Isoflurane* - Isoflurane has a moderate-to-high blood-gas partition coefficient (around **1.4**), indicating high solubility compared to N2O. - Due to its high solubility, it has relatively slow **wash-in** and **wash-out** kinetics, leading to slower induction and emergence. *Incorrect: Sevoflurane* - Sevoflurane has a low blood-gas partition coefficient (around **0.65**), making its onset and offset faster than Isoflurane or Halothane. - Although it is considered a fast agent, its solubility is still higher than both **Desflurane** and **N2O**. *Incorrect: Halothane* - Halothane has the highest blood-gas partition coefficient of the agents listed (approximately **2.5**). - Its high solubility results in the slowest **induction** and **emergence** profiles because the blood must be saturated significantly before the partial pressure in the brain rises enough to cause anesthesia. [Practice more Anesthesiology PYQs on OnCourse]

Q: In epidural anesthesia, which of the following layers is least likely to be punctured during the procedure?

Arachnoid mater. ***Arachnoid mater*** - The **arachnoid mater** is located inside the dura mater. Puncturing it implies entering the subarachnoid (intrathecal) space, which is the goal of spinal anesthesia, not epidural. - Epidural anesthesia specifically targets the space external to the **dura mater** (the epidural space), and great care is taken to avoid puncturing the dura and the arachnoid layer beneath it. *Ligamentum flavum* - The **ligamentum flavum** is a crucial anatomical landmark that helps identify the entrance to the epidural space via the 'loss of resistance' technique. - The needle must be advanced **through** the ligamentum flavum to successfully enter the epidural space, meaning its puncture is necessary. *Supraspinous ligament* - The **supraspinous ligament** connects the tips of the spinous processes and is the most superficial central ligament encountered. - It is one of the initial layers that the needle **must penetrate** before proceeding deeper to the interspinous ligament and the ligamentum flavum. *Interspinous ligament* - The **interspinous ligament** connects adjacent spinous processes and lies between the supraspinous ligament and the ligamentum flavum. - This ligament must be traversed by the needle to reach the epidural space, and is **intentionally punctured** during the procedure. [Practice more Anesthesiology PYQs on OnCourse]

4 Previous Year Questions with Answers & Explanations

Questions

Which of the following is the use of the Mallampatti classification?

Which of the following is the most common drug used in day care surgery/TIVA?

Which of the following inhalation agents has a blood-gas partition coefficient similar to nitrous oxide?

In epidural anesthesia, which of the following layers is least likely to be punctured during the procedure?

FMGE 2024 - Anesthesiology FMGE Practice Questions and MCQs

Question 1: Which of the following is the use of the Mallampatti classification?

A. To evaluate the fitness of the patient
B. To evaluate the pros and cons of surgery
C. Endotracheal intubation (Correct Answer)
D. To evaluate the risk of surgery

Explanation: ***Correct Option C: Endotracheal intubation*** - The Mallampati classification assesses the visibility of the soft palate, uvula, and tonsillar pillars, which directly correlates with the ease of achieving a satisfactory view during **direct laryngoscopy** - It is a critical component of the **pre-anesthetic airway assessment** used alongside thyromental distance and mouth opening to predict difficult airway management and guide intubation strategy - Classes I-IV predict increasing difficulty in intubation, with Class III-IV indicating potentially difficult airways *Incorrect Option A: To evaluate the fitness of the patient* - Patient fitness evaluation involves holistic assessment of **cardiopulmonary reserve** and functional capacity, ensuring the patient can safely tolerate the physiological stress of surgery and anesthesia - Fitness relies on optimizing chronic medical conditions and functional capacity, not just anatomical classification of the airway opening *Incorrect Option B: To evaluate the pros and cons of surgery* - This evaluation is a clinical and ethical judgment based on the patient's **disease severity**, anticipated benefits, potential complications, and mortality associated with the procedure - The Mallampati score does not directly contribute to weighing the overall risk-benefit ratio of the surgical procedure itself *Incorrect Option D: To evaluate the risk of surgery* - Surgical risk is determined using tools like the **ASA physical status classification** (P1-P6), comorbidities, and type of surgery - While a predicted difficult airway (Mallampati class III or IV) increases the **anesthesia-related risk**, it does not comprehensively define the overall surgical risk profile

Question 2: Which of the following is the most common drug used in day care surgery/TIVA?

A. Sodium thiopentone
B. Ketamine
C. Propofol (Correct Answer)
D. Halothane

Explanation: ***Propofol***- **Propofol** is the anesthetic of choice for **TIVA** (Total Intravenous Anesthesia) and day care surgery due to its favorable pharmacokinetics, including rapid onset and smooth awakening.- Its **ultra-short duration of action** and rapid metabolic clearance ensure a quick, clear-headed recovery, which is essential for minimizing post-anesthesia care unit (PACU) time and facilitating early discharge.*Sodium thiopentone*- Although used for induction, **sodium thiopentone** has a longer context-sensitive half-time than propofol, resulting in **slower emergence** and potential for prolonged postoperative drowsiness.- Due to its slower recovery profile and higher risk of **residual sedation**, it is generally not preferred for short procedures in day care settings.*Halothane*- **Halothane** is a volatile **inhalational anesthetic** and, therefore, cannot be used for TIVA, which requires intravenous agents.- Modern volatile agents have largely replaced halothane due to the risk of severe side effects, notably cardiovascular depression and potentially fatal **halothane-induced hepatotoxicity**.*Ketamine*- **Ketamine** provides excellent analgesia and cardiovascular stability (sympathomimetic effects), but it frequently causes **psychomimetic side effects** (emergence delirium, hallucinations) during recovery, which are undesirable in day care.- Full Ketamine anesthesia often requires concurrent use with benzodiazepines (midazolam) to mitigate emergence phenomena, making it less suitable as a sole agent for smooth, rapid day care surgery recovery.

Question 3: Which of the following inhalation agents has a blood-gas partition coefficient similar to nitrous oxide?

A. Desflurane (Correct Answer)
B. Isoflurane
C. Halothane
D. Sevoflurane

Explanation: ***Correct: Desflurane*** - Desflurane has a **blood-gas partition coefficient** of 0.42, which is the closest value to that of **nitrous oxide (N2O)** (0.47) among the volatile agents listed. - This very low solubility in blood facilitates rapid **wash-in** and **wash-out**, translating to the fastest induction and emergence profiles among potent volatile anesthetics. *Incorrect: Isoflurane* - Isoflurane has a moderate-to-high blood-gas partition coefficient (around **1.4**), indicating high solubility compared to N2O. - Due to its high solubility, it has relatively slow **wash-in** and **wash-out** kinetics, leading to slower induction and emergence. *Incorrect: Sevoflurane* - Sevoflurane has a low blood-gas partition coefficient (around **0.65**), making its onset and offset faster than Isoflurane or Halothane. - Although it is considered a fast agent, its solubility is still higher than both **Desflurane** and **N2O**. *Incorrect: Halothane* - Halothane has the highest blood-gas partition coefficient of the agents listed (approximately **2.5**). - Its high solubility results in the slowest **induction** and **emergence** profiles because the blood must be saturated significantly before the partial pressure in the brain rises enough to cause anesthesia.

Question 4: In epidural anesthesia, which of the following layers is least likely to be punctured during the procedure?

A. Supraspinous
B. Arachnoid mater (Correct Answer)
C. Ligamentum flavum
D. Interspinous ligament

Explanation: ***Arachnoid mater*** - The **arachnoid mater** is located inside the dura mater. Puncturing it implies entering the subarachnoid (intrathecal) space, which is the goal of spinal anesthesia, not epidural. - Epidural anesthesia specifically targets the space external to the **dura mater** (the epidural space), and great care is taken to avoid puncturing the dura and the arachnoid layer beneath it. *Ligamentum flavum* - The **ligamentum flavum** is a crucial anatomical landmark that helps identify the entrance to the epidural space via the 'loss of resistance' technique. - The needle must be advanced **through** the ligamentum flavum to successfully enter the epidural space, meaning its puncture is necessary. *Supraspinous ligament* - The **supraspinous ligament** connects the tips of the spinous processes and is the most superficial central ligament encountered. - It is one of the initial layers that the needle **must penetrate** before proceeding deeper to the interspinous ligament and the ligamentum flavum. *Interspinous ligament* - The **interspinous ligament** connects adjacent spinous processes and lies between the supraspinous ligament and the ligamentum flavum. - This ligament must be traversed by the needle to reach the epidural space, and is **intentionally punctured** during the procedure.