CSC Pharmacology of Sedative Agents 2

Question 1

Which benzodiazepine is most commonly used for conscious sedation due to its rapid onset and amnestic properties?

Accepted Answer

Midazolam

Answer

Midazolam is preferred for conscious sedation because of its rapid onset (2–3 min IV), short duration, and reliable anterograde amnesia.

Question 2

What is the primary mechanism by which propofol produces sedation?

Accepted Answer

GABA-A receptor potentiation

Answer

Propofol enhances GABA-A receptor-mediated chloride influx, producing CNS depression and sedation.

Question 3

A patient receives fentanyl for procedural sedation. Which effect is MOST likely to require intervention?

Accepted Answer

Respiratory depression

Answer

Fentanyl, like all opioids, can cause dose-dependent respiratory depression, which is the primary life-threatening risk.

Question 4

Which drug is the reversal agent for benzodiazepine-induced sedation?

Accepted Answer

Flumazenil

Answer

Flumazenil competitively antagonizes benzodiazepine binding at the GABA-A receptor, reversing sedation and respiratory depression.

Question 5

Ketamine produces dissociative sedation primarily through which receptor mechanism?

Accepted Answer

NMDA receptor antagonism

Answer

Ketamine blocks NMDA (N-methyl-D-aspartate) glutamate receptors, producing its unique dissociative anesthetic state.

(CSC) Conscious Sedation Certification Practice Test