CAJ | 학술논문

目的评价不同剂量谷胱甘肽(GSH)对体外循环(CPB)下心内直视手术患儿心肌损伤的影响.方法择期CPB下行室间隔缺损修补术患儿48例,年龄2～5岁,ASA分级Ⅱ或Ⅲ级,采用随机数字表法,将患儿随机分为4组(n＝12):对照组(C组)和不同剂量GSH组(G1-3组).G1～3组分别于含血停搏液中加入GSH 50、75、100 mg/kg,C组单用含血停搏液.分别于切皮前即刻(T0)、主动脉开放后30 min(T1)、停CPB后6、12、24 h(T2-4)时取颈内静脉血样,测定血浆心肌肌钙蛋白Ⅰ(cTnI)浓度.于主动脉阻断前即刻及主动脉开放后15 min取心肌组织,观察心肌超微结构,对心肌细胞行线粒体量化评分.结果与C组比较,G1,2组T3,4时、G3组T1～4时血浆cTnI浓度降低(P<0.05)；与G1组和G2组比较,G3组T1～4时血浆cTnI浓度降低(P<0.05)；与C组和G1,2组比较,G3组主动脉开放后15 min时心肌细胞线粒体量化评分降低(P<0.05).G3组心肌损伤程度较C组明显减轻.结论 GSH可呈剂量依赖性地减轻CPB下心内直视手术患儿心肌损伤,剂量100 mg/kg时效果较好.
목적 평개불동제량곡광감태(GSH)대체외순배(CPB)하심내직시수술환인심기손상적영향.방법 택기CPB하행실간격결손수보술환인48례,년령2～5세,ASA분급Ⅱ혹Ⅲ급,채용수궤수자표법,장환인수궤분위4조(n＝12):대조조(C조)화불동제량GSH조(G1-3조).G1～3조분별우함혈정박액중가입GSH 50、75、100 mg/kg,C조단용함혈정박액.분별우절피전즉각(T0)、주동맥개방후30 min(T1)、정CPB후6、12、24 h(T2-4)시취경내정맥혈양,측정혈장심기기개단백Ⅰ(cTnI)농도.우주동맥조단전즉각급주동맥개방후15 min취심기조직,관찰심기초미결구,대심기세포행선립체양화평분.결과 여C조비교,G1,2조T3,4시、G3조T1～4시혈장cTnI농도강저(P<0.05)；여G1조화G2조비교,G3조T1～4시혈장cTnI농도강저(P<0.05)；여C조화G1,2조비교,G3조주동맥개방후15 min시심기세포선립체양화평분강저(P<0.05).G3조심기손상정도교C조명현감경.결론 GSH가정제량의뢰성지감경CPB하심내직시수술환인심기손상,제량100 mg/kg시효과교호.
Objective To investigate the effects of cardioplegic solution enriched with different doses of glutathione on myocardial injury in children undergoing cardiac surgery under cardiopulmonary bypass (CPB).Methods Forty-eight ASA [Ⅱ or Ⅲ patients aged 2-5 yr undergoing repair of ventricular septal defect under CPB were randomly divided into 4 groups (n ＝ 12 each):control group (group C) and cardioplegic solution containing 3 different-dose of glutathione groups ( group G1-3 ).Glutathione 50,75,100 mg/kg were added to cardioplegic solution in group G1-3 respectively.Blood samples were collected before operation (T0),at 30 min after release of aortic cross-clamp (T1),at 6,12,24 h after termination of CPB (T2-4) for determination of plasma cTnI concentration.Myocardial specimens were obtained from right auricle before aortic cross-clamp and 15 min after release of aortic cross-clamp.The ultrastructure of myocardium was examined with scanning electron microscope.A mitochondrial FlaMeng semiquantitative analysis was done.Results The plasma concentration of cTnI at T3,4 were significantly lower in groups G1,2 than in group C.The plasma concentration of cTnI at T1-4 were significantly lower in group G3 than in group C and group G1,2.The quantization score of myocardial mitochondria at 15 min after release of aortic cross-clamp were significantly lower in group G3 than in group C and group G1,2.Micorscopic examination showed that the injury to myocardial ultrastructure was attenuated in group G3 compared with group C.Conclusion Cardioplegic solution enriched with glutathione can reduce myocardial injury induced by CPB in a dose dependent manner.Glutathione 100 mg/kg can exert a visibly protective effect on myocardium.