[General anesthesia and preoperative changes in plasma beta-endorphin]

Area of Science:

• Anesthesiology
• Endocrinology
• Surgical Medicine

Context:

• Investigating patient stress responses during abdominal surgery.
• Comparing three distinct anesthetic regimens: neuroleptanalgesia (droperidol/fentanyl), pure analgesia (fentanyl), and halothane with fentanyl.
• Monitoring hormonal variations from premedication through the recovery phase.

Purpose:

• To analyze the differential effects of anesthetic techniques on plasmatic beta-endorphin and cortisol levels.
• To determine how specific anesthetic agents influence the neuroendocrine stress response in surgical patients.

Summary:

• Beta-endorphin levels remained stable with neuroleptanalgesia and pure analgesia but increased post-incision with halothane anesthesia.
• Cortisol levels were stable until incision across all groups, then significantly elevated in neuroleptanalgesia and halothane groups.
• Fentanyl-based anesthesia showed a delayed and attenuated cortisol increase compared to the other anesthetic strategies.

Impact:

• Provides insights into the neuroendocrine modulation of pain and stress by different anesthetic protocols.
• Informs anesthetic choices to potentially mitigate stress responses and optimize patient recovery.
• Highlights the distinct physiological impacts of volatile agents versus opioid-based anesthesia on stress markers.