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Theophylline metabolism after cardiac surgery.

机译:心脏手术后茶碱代谢。

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The effect and metabolism of theophylline administration after cardiac surgery has never been reported. Two series of 2-hour intravenous aminophylline administrations (3 mg/kg/h) were conducted in 10 adult patients on the operative day (acute phase) and on the 4th or 5th postoperative day (recovery phase). Both blood and urine samples were collected for 24 hours after dosing. Heart rate increased in both phases, but the cardiac index increased with the decrease of diastolic blood pressure only in the acute phase (p < 0.05). Plasma concentration levels of theophylline tended to be slightly higher in the acute phase, and renal clearance increased in the recovery phase (p < 0.05). The urinary ratio of 3-methylxanthine to theophylline was significantly higher in the acute phase (p < 0.05). This suggests that cytochrome P4501A2 is partially activated rather than depressed and that N-demethylation is promoted more than hydroxylation immediately after surgery.
机译:从未报道过心脏手术后给予茶碱的作用和代谢。在手术当天(急性期)和术后第4或5天(恢复期)对10名成年患者进行了两次2小时的静脉内氨茶碱静脉内给药(3 mg / kg / h)。给药后24小时收集血液和尿液样品。这两个阶段的心率均增加,但仅在急性期,心脏指数随舒张压的降低而增加(p <0.05)。在急性期茶碱的血浆浓度水平趋于略高,在恢复期肾清除率增加(p <0.05)。在急性期,3-甲基黄嘌呤与茶碱的尿比例显着更高(p <0.05)。这表明细胞色素P4501A2被部分激活而不是被抑制,并且在手术后立即促进N-去甲基化而不是羟基化。

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