Serum glutathione S-transferase concentrations and creatinine clearance after sevoflurane anaesthesia

The effects of sevoflurane and isoflurane on serum glutathione S-transferase concentrations and creatinine clearance were compared in 50 ASA I–III patients aged over 18 years undergoing body surface surgery of 1–3 h predicted duration. Patients randomly received sevoflurane ( n  = 24) or isoflurane ( n  = 26) in nitrous oxide and oxygen ( F IO ₂ = 0.4) via a nonrebreathing system. Fluids were standardised and patient's lungs ventilated to normocapnia. Expired concentration of anaesthetic agent was adjusted to maintain systolic arterial pressure between 70 and 100% of baseline. Patients received significantly less (p < 0.05) sevoflurane (1.0 MAC-h) than isoflurane (1.5 MAC-h). Using serum glutathione S-transferase concentrations and creatinine clearance as markers of hepatic and renal function respectively, no statistically significant differences were identified between the groups.