缺血后处理对婴幼儿法洛四联症根治术中心肌的保护作用

The myocardial protective effect of ischemic post-conditioning on infants with total repair for tetralogy of fallot

目的 探讨婴幼儿法洛四联症根治术中行心肌缺血后处理的心肌保护作用,以改善患者的近期预后.方法 64例婴幼儿法洛四联症患者随机分成两组,每组32例,对照组行常规手术,观察组给予3个周期的缺血后处理.观察手术临床指标：体外循环时间、主动脉阻断时间、自动复跳率、后并行至脱机时间、脱机后血压、脱机后多巴胺使用量、拔管时间、ICU滞留时间、术后并发症;并检测实验室指标：麻醉诱导后和主动脉阻断后10 min、主动脉开放后10 min、ICU 1 h、术后1 d、术后2 d血浆中肌钙蛋白Ⅰ和肌酸磷酸激酶同工酶的水平.结果 全组死亡2例（3.1%）.其余患儿均治愈出院.两组术中术后实验室指标差异均有统计学意义（均P＜0.05）,临床指标差异均无统计学意义（均P＞0.05）.但对于主动脉阻断时间大于60 min的亚组,临床指标差异均有统计学意义（均P＜0.05）.结论 缺血后处理在婴幼儿法洛四联症根治术中能增强心肌保护作用,对于主动脉阻断时间大于60 min的病例,其临床意义尤为明显.

Objective To investigate the myocardial protective effect of isehemic post-conditioning in total repair for tetralogy of fallot,in order to improve short-term prognosis of infant patients.Methods 64 cases of TOF infant patients were randomly divided into two groups,32 cases in the control group：conventional surgery without ischemic post-conditioning,and other 32 cases in the experimental group：given three cycles of ischemic post-conditioning.Then the clinical indieators：cardiopulmonary bypass time,aortic cross-clamping time,automatic re-jump rate,the latter parallel to the off-line time,the off-line blood pressure,the offline dopamine usage,extubation time,ICU stay time,postoperative complications,and the testing laboratory indicators：the cTnI and CK-MB levels in plasma after anesthesia induction,10min after aortic cross-clamping,10min after aortic opening,ICU1h,1d after surgery,and 2d after surgery were observed.Results Two patients were died and,mortality rate was 3.1%.The remaining patients were discharged from hospital.Laboratory indicators of the control group and the experimental group had significant differences （all P＜0.05）,while the clinical indicators of the two groups had no significant differences（all P＞0.05）.But for the sub-group which the aortic cross-clamping time were more than 60min,the clinical indicators were significantly different（all P＜0.05）.Conclusion Ischemic post-conditioning could enhance myocardial protection in total repair for tetralogy,of fallot.for the cases aortic cross-clamping time was more than 60min,their clinical meanings were more obvious.