Modification of corticosteroid synthesis by etomidate/fentanyl and air anesthesia

Area of Science:

• Anesthesiology
• Endocrinology
• Surgical Research

Background:

• Cortisol synthesis is crucial for stress response during surgery.
• Etomidate is an anesthetic agent with known effects on adrenal function.
• Fentanyl is an opioid analgesic commonly used in anesthesia.

Purpose of the Study:

• To investigate the impact of etomidate/fentanyl combination on cortisol synthesis during major abdominal vascular surgery.
• To identify the specific site of action for any observed blockade in corticosteroidogenesis.

Main Methods:

• Seven patients undergoing major abdominal vascular surgery were studied.
• Measurements included cortisol, androstenedione, 11-deoxycortisol (Compound S), and ACTH.
• An ACTH1-24 stimulation test was performed in the fourth hour to assess adrenal response.

Main Results:

• ACTH and androstenedione levels remained stable; androstenedione response to ACTH was blunted but normal.
• Compound S and cortisol concentrations decreased during anesthesia.
• No significant increase in Compound S or cortisol was observed after ACTH1-24 stimulation.

Conclusions:

• Etomidate and fentanyl infusion may induce a blockade in corticosteroid synthesis.
• The blockade appears to occur at the conversion of cholesterol to pregnenolone.
• Clinical findings require confirmation through experimental laboratory studies.