BCSE Principles of Anesthesia 2

Question 1

Which volatile anesthetic has the lowest blood-gas partition coefficient, resulting in the fastest induction and emergence?

Accepted Answer

Desflurane

Answer

Desflurane has the lowest blood-gas partition coefficient (0.42) among modern volatile agents, enabling the most rapid induction and emergence.

Question 2

A patient develops masseter muscle rigidity immediately after succinylcholine administration. What is the most concerning diagnosis?

Accepted Answer

Malignant hyperthermia susceptibility

Answer

Masseter spasm after succinylcholine is a warning sign of malignant hyperthermia susceptibility and warrants discontinuation of triggering agents.

Question 3

Which mechanism best describes how propofol produces its hypnotic effect?

Accepted Answer

GABA-A receptor potentiation

Answer

Propofol enhances inhibitory chloride conductance through GABA-A receptor potentiation, producing sedation and hypnosis.

Question 4

During a difficult airway, which nerve block would anesthetize the supraglottic structures above the vocal cords?

Accepted Answer

Superior laryngeal nerve internal branch block

Answer

The internal branch of the superior laryngeal nerve provides sensory innervation to the supraglottic larynx above the vocal cords.

Question 5

A patient receiving neuraxial anesthesia develops hypotension and bradycardia. Which spinal level has most likely been blocked?

Accepted Answer

T4-T6

Answer

Blockade of T4-T6 sympathetic fibers can block cardiac accelerator fibers, causing both hypotension from vasodilation and bradycardia.

BCSE - Basic and Clinical Sciences Examination Practice Test