**Question:** Induction agent that may cause adrenal coex suppression is

A. Propofol
B. Sedative-hypnotic agents (e.g., benzodiazepines)
C. Thiopentone
D. Midazolam

**Core Concept:** Adrenal coex suppression refers to the suppression of the adrenal glands' function due to anesthetic agents. This can lead to a decrease in cortisol and aldosterone production, which can have serious clinical implications.

**Why the Correct Answer is Right:** Propofol (A) is a short-acting intravenous anesthetic agent commonly used for induction and maintenance of general anesthesia. However, propofol can cause adrenal coex suppression, particularly when administered in high doses over a short period of time. This is because propofol inhibits the hypothalamic-pituitary-adrenal (HPA) axis, which regulates the release of adrenocorticotropic hormone (ACTH), cortisol, and aldosterone.

**Why Each Wrong Option is Incorrect:**

B. Sedative-hypnotic agents (e.g., benzodiazepines) do not cause significant adrenal coex suppression, as they primarily affect the central nervous system and do not directly interact with the HPA axis.

C. Thiopentone (also known as thiopental) is a barbiturate used for general anesthesia induction. However, the extent of adrenal coex suppression caused by thiopentone is less than that of propofol, but it still has the potential to cause adrenal suppression.

D. Midazolam, a benzodiazepine, is less likely to cause adrenal coex suppression than propofol due to its peripheral action on the CNS. However, like thiopentone, midazolam can lead to adrenal suppression, albeit to a lesser extent than propofol.

**Clinical Pearl:** Administering anesthetic agents judiciously and monitoring for signs of adrenal suppression, such as hypotension, hypoglycemia, and prolonged recovery time, is crucial to minimize the risk of adrenal coex suppression. It is essential to recognize the potential for adrenal suppression when using agents like propofol and thiopentone, which can lead to complications like hypotension, hypoglycemia, and delayed recovery. Monitoring patients' vital signs and cortisol levels during and after anesthesia can help identify and manage adrenal suppression promptly.