PMID: 1239223Nov 1, 1975

A comparison of renal effects and metabolism of sevoflurane and methoxyflurane in enzyme-induced rats

Anesthesia and Analgesia
T L CookR I Mazze


Twenty-five 5-month-old male Fischer-344 rats were randomly divided into 5 groups: Group I, no anesthesia; Group II, 1.4 precent sevoflurane for 2 hours; Group III, 0.1 percent phenobarbital, ad lib, in drinking water for 7 days; followed by 1.4 percent sevoflurane for 2 hours; Group IV, 0.25 percent methoxyflurane, 1 hour; Group V, phenobarbital in water as in Group III, followed by methoxyflurane as in group IV. Pre- and postanesthetic serum and urinary osmolality, Na+, K+, urea nitrogen (BUN), inorganic fluoride (F-) levels, and 24-hour urine volume were measured. Kidney tissue was obtained for examination by light and electron microscopy. Sevoflurane was metabolized to F- to a lesser extent than was methoxyflurane; treatment with phenobarbital-sevoflurane doubled urinary F- excretion, resulting in a value similar to that seen after methoxyflurane alone. There was no functional or morphologic evidence of renal abnormalities in either group of rats anesthetized with sevoflurane. Methoxyflurane dosage was sufficiently low that renal abnormalities did not occur except in rats treated also with phenobarbital; these animals developed polyuria and the morphologic lesion typically associated with F--induced nephrotoxicity.


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Mar 1, 1992·The Veterinary Clinics of North America. Small Animal Practice·E P Steffey
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Anesthetic Effect
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