Tenoxicam i.v. for major gynaecological surgery--effects on renal function

Area of Science:

• Anesthesiology
• Pharmacology
• Nephrology

Background:

• Nonsteroidal anti-inflammatory drugs (NSAIDs) like tenoxicam inhibit cyclooxygenase, potentially affecting renal prostaglandins.
• Major surgery and anesthesia can impact renal function and fluid balance.
• Understanding the renal effects of NSAIDs in surgical patients is crucial for perioperative management.

Purpose of the Study:

• To investigate the effects of a single intravenous dose of tenoxicam on renal function and electrolyte balance in women undergoing major gynecological oncology surgery.
• To assess the impact of tenoxicam on prostaglandin and thromboxane levels in the perioperative period.

Main Methods:

• A randomized, double-blind, placebo-controlled trial involving 30 women undergoing major gynecological oncology surgery.
• Participants received either placebo or tenoxicam 20 mg intravenously prior to surgery.
• Plasma and urinary electrolytes, creatinine, prostaglandins (PgE2, PgF1 alpha), and thromboxane (TxB2) were measured preoperatively and for four days postoperatively.

Main Results:

• No significant differences were observed in plasma/urinary electrolytes, creatinine clearance, prostaglandins, or thromboxane between the tenoxicam and placebo groups.
• Creatinine clearance showed minimal changes, consistent with surgical stress and rehydration, not drug effects.
• Both groups required similar amounts of intraoperative ephedrine and intravenous fluids.

Conclusions:

• A single 20 mg dose of tenoxicam did not demonstrate significant effects on renal function, electrolyte balance, or prostaglandin levels in this surgical population.
• The findings underscore the importance of hemodynamic stability (blood pressure maintenance) and adequate fluid management for preserving renal function during major surgery.
• Larger studies would be needed to detect subtle effects of tenoxicam on renal parameters beyond surgical and anesthetic influences.