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Of 125 patients with postsurgical acute tubular necrosis, 87 died, 34 regained clinical normal renal function, and 4 survivors (9.5%) were left with severe permanent renal failure, two of whom required chronic dialysis and transplantation. Preoperatively these 4 patients had normal renal function. The 4 patients were above age 60, two had undergone methoxyflurane anesthesia, and nephrotoxic antibiotics were used in all. The incidence of permanent renal failure is much higher than ever reported and may reflect the survival of patients who previously died because of less ideal dialysis. We believe that the cause of this permanent lesion is multifactorial, including age (over 60 years), nephrotoxic antibiotics (particularly cephalothin and gentamicin sulfate), and nephrotoxic anesthetic (methoxyflurane) agents. This combination of factors should be avoided whenever possible.

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