冠状动脉搭桥术病人围手术期褪黑激素昼夜节律性分泌的研究

目的　观察冠状动脉搭桥术病人围手术期褪黑激素昼夜节律性分泌。方法　将 4 0例在低温体外循环或非体外循环下行冠脉搭桥术的男性病人 ,分为体外循环组和非体外循环组 ,每组2 0例。所有病人均在麻醉诱导前 (基础值 )、气管插管后 10min、肝素化后 10min、转机后 30min(或切皮后 2h)、中和肝素前和术终各时点及术后每 3h抽血 1次 ,持续到术后 2 4h。采用酶联免疫方法检测血浆褪黑激素含量。结果　体外循环组病人在转中和转后褪黑激素浓度高于术前 ,非体外循环组病人术中血浆褪黑激素浓度没有变化。诱导后、转中和转后时点体外循环组病人和相应时点非体外循环组病人褪黑激素浓度分别为 7.2± 3.4、10 .5± 5 .2、9.5± 4 .0和 5 .5± 2 .5、6 .3± 2 .0、5 .7± 2 .1ng/ml(均P <0 .0 5 )。在术后 2 4h体外循环组和非体外循环组中各有 2例和 6例病人褪黑激素表现为昼夜节律性分泌 ,其余病人则无褪黑激素昼夜节律性分泌。结论　体外循环与非体外循环冠状动脉搭桥术后多数病人褪黑激素昼夜节律性分泌紊乱 ,但非体外循环组病人术后早期有褪黑激素昼夜分泌节律性的病例数多于体外循环组。体外循环可能是褪黑激素分泌节律紊乱的原因之一。

Perioperative melatonin circadian secretion in patients undergoing coronary artery bypass grafting surgery

OBJECTIVE: To investigate the circadian rhythm of perioperative melatonin secretion in patients undergoing coronary artery bypass grafting surgery. METHODS: Forty male patients scheduled for elective coronary artery bypass grafting surgery (CABG) under hypothermic cardiopulmonary bypass (CPB) or off-pump were allocated into two groups of 20 patients: CPB group and off-pump group. Blood samples were withdrawn from all patients immediately before the induction of anesthesia (baseline), 10 min after the induction of anesthesia, 10 min after heparinization, 30 min after commencement of CPB (or 2h after skin incision), before reversal of heparin with protamine, at the end of surgery, and. every 3 hours after operation until the twenty-fourth hour. The plasma concentration of melatonin was measured by using enzyme-linked immunosorbent assay. RESULTS: The plasma melatonin concentrations during and after CPB were higher than the baseline value in the CPB group. There were no differences in the melatonin concentrations in the off-pump group. In the CPB group the melatonin concentrations after induction, during CPB, and after CPB were 7.2 +/- 3.4, 10.5 +/- 5.2, and 9.5 +/- 4.0 respectively, all significantly higher than those in the off-pump (5.5 +/- 2.5, 6.3 +/- 2.0, and 5.7 +/- 2.1 respectively, all P < 0.05). During the twenty-four hours after operation, two patients in the CPB group and six patients in the off-pump group showed circadian rhythm of melatonin secretion. CONCLUSION: The perioperative circadian rhythm of melatonin secretion in patients undergoing CABG surgery with CPB or off-pump is disturbed, however relatively more patients under off-pump group regain secretion rhythm of melatonin in the immediate postoperative period. CPB may be one of the reasons for perioperative melatonin circadian secretion disturbance.