Changes in vitamin E concentration after surgery and anesthesia

Area of Science:

• Anesthesiology and Perioperative Medicine
• Clinical Biochemistry
• Nutritional Science

Background:

• Cholecystectomy is a common surgical procedure.
• Anesthetic agents can potentially influence biochemical markers.
• Vitamin E's role in cellular protection warrants investigation in surgical contexts.

Purpose of the Study:

• To evaluate the impact of halothane versus isoflurane anesthesia on vitamin E concentrations in female patients undergoing cholecystectomy.
• To assess changes in liver enzyme activities (ALT, AST, GGT) post-surgery in relation to anesthetic choice.

Main Methods:

• Randomized study involving 32 female patients (age 30-60, ASA I) undergoing cholecystectomy.
• Vitamin E levels measured pre-operatively and at 1, 5, 24 hours, and 4 days post-surgery.
• High-pressure liquid chromatography used for vitamin E determination; liver enzymes (ALT, AST, GGT) also analyzed.

Main Results:

• A statistically significant decrease in vitamin E concentrations was observed at all measured time points post-surgery compared to pre-operative values (P < 0.05 to P < 0.01).
• The lowest vitamin E levels occurred 24 hours post-operation, with slightly higher, though not statistically significant, levels in the isoflurane group.
• No significant differences in liver enzyme activities (ALT, AST, GGT) were found between the anesthetic groups or over time.

Conclusions:

• Cholecystectomy under both halothane and isoflurane anesthesia leads to a significant reduction in circulating vitamin E levels.
• The observed changes in vitamin E are time-dependent, with a nadir at 24 hours post-surgery.
• Anesthetic choice (halothane vs. isoflurane) does not appear to significantly impact post-operative vitamin E levels or liver enzyme activity.