Urine concentrating ability after prolonged sevoflurane anaesthesia

Area of Science:

• Anesthesiology
• Nephrology
• Pharmacology

Background:

• The vasopressin test is used to assess urine concentrating ability.
• Limited research exists on sevoflurane's impact on renal function post-anesthesia.
• Sevoflurane metabolism can produce fluoride ions, raising nephrotoxicity concerns.

Purpose of the Study:

• To compare the effects of prolonged sevoflurane anesthesia versus isoflurane on urine concentrating ability.
• To evaluate for subclinical nephrotoxicity after sevoflurane anesthesia using the vasopressin test.

Main Methods:

• A prospective study involving two groups of patients undergoing orthopedic procedures.
• Group 1 (n=11) received prolonged sevoflurane anesthesia; Group 2 (n=10) received isoflurane anesthesia.
• A vasopressin test was administered on postoperative day one to assess renal concentrating function.

Main Results:

• Mean sevoflurane dose was 10.6 MAC-h; mean isoflurane dose was 8.5 MAC-h.
• Peak serum fluoride concentration in the sevoflurane group averaged 41.9 µmol/L, exceeding 20 µmol/L for ~20 hours.
• Both anesthetic groups demonstrated similar responses to the vasopressin test, indicating comparable urine concentrating abilities.

Conclusions:

• Prolonged sevoflurane anesthesia did not impair the urine concentrating ability of patients.
• No evidence of subclinical nephrotoxicity was detected in patients who received sevoflurane anesthesia.
• Sevoflurane appears to be safe for prolonged use in orthopedic procedures regarding renal function.