To determine optimal dose, method and time of administration of aminophylline to enhance the recovery from general anesthesia. andTo estimate the recovery time from isoflurane closure in each group. We hypothesize that starting administration of loading and maintenance dose of aminophylline half an hour before discontinuing isoflurane will shorten the duration needed to extubate patients undergoing lumbar disc surgery. We hypothesized that it will yield superior results compared to bolus administration after discontinuing isoflurane.
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Recovery time
Timeframe: one hour