摘要
目的 评价肢体缺血预处理对重度失血性休克复苏大鼠心肌缺血再灌注损伤的影响.方法 健康成年雄性SD大鼠24只,体重300 ~ 350 g,采用随机数字表法,将其分为3组(n=8):对照组(C组)、重度失血性休克复苏组(HSR组)和肢体缺血预处理组(LIP组).经颈总动脉放血1h,放血量为总血容量50%,30 min后经颈静脉30 min内回输全部自体血以建立重度失血性休克复苏模型.LIP组于放血前40 min采用止血带阻断双侧后肢血流5 min,松开5min,反复4次,其余操作同HSR组.于放血前(T0)、放血结束即刻(T1)、血液回输前(T2)、血液回输结束即刻(T3)、回输后1 h(T4)和2h(T5)时记录MAP,采用彩色超声仪测量心输出量(CO)、左室射血分数(LVEF)和心肌作功指数(MPI),采用旁暗流成像仪测量舌下微循环总血管密度(TVD)、灌注血管密度(PVD)、灌注血管比例(PPV)、微血管流动指数(MFI),记录失血性休克复苏后72 h内大鼠的生存情况.结果 与C组比较,HSR组T1-5时、LIP组T1,2时MAP、CO、LVEF、TVD、PVD、PPV和MFI降低,MPI升高(P<0.01);与HSR组比较,LIP组T3-5时MAP、CO、LVEF、TVD、PVD、PPV和MFI升高,MPI降低,复苏后72 h生存率升高(P<0.01).结论 肢体缺血预处理可显著减轻重度失血性休克复苏大鼠心肌缺血再灌注损伤,有利于预后.
Objective To evaluate the effects of limb ischemic preconditioning on myocardial ischemiareperfusion injury in a rat model of severe hemorrhagic shock and resuscitation.Methods Twenty-four male Sprague-Dawley rats,weighing 300-350 g,were randomized into 3 groups (n =8 each) using a random number table:control group (group C); severe hemorrhagic shock and resuscitation group (HSR group); limb ischemic preconditioning group (group LIP).Hemorrhagic shock and resuscitation was induced by withdrawing blood (50% of the total blood volume) from the left common carotid artery over an interval of 1 h,and 30 min later the animals were then resuscitated by infusion of the shed blood via the jugular vein over 30 min.Limb ischemic preconditioning was induced by 4 cycles of 5 min limb ischemia followed by 5 min reperfusion at 40 min before ischemia in LIP group.Before withdrawing blood (T0),immediately after the end of withdrawing blood (T1),before infusion of the shed blood (T2),and at 0,1 and 2 h after infusion of the shed blood (T3-5),mean artery pressure (MAP) was measured,the cardiac output (CO),left ventricular ejection fraction (LVEF) and myocardial performance index (MPI) were detected using color Vivid flow imaging,and total vessel density (TVD),perfusing vessel density (PVD),proportion of perfused vessels (PPV),microvascular flow index (MFI) of sublingual microcirculation were measured using sidestream dark-field imaging.The survival rates within 72 h after hemorrhagic shock and resuscitation were recorded.Results Compared with C group,MAP,CO,LVEF,TVD,PVD,PPV and MFI were significantly decreased and MPI was increased at T1-5 in HSR group and at T1 and T2 in LIP group (P 〈 0.01).Compared with HSR group,MAP,CO,LVEF,TVD,PVD,PPV and MFI were significantly increased and MPI was decreased at T3-5,and the survival rate within 72 h was increased in LIP group (P 〈 0.01).Conclusion Limb ischemic preconditioning can significantly attenuate myocardial ischemiareperfusion injury induced by severe hemorrhagic shock and resuscitation in rats and is helpful for prognosis.
出处
《中华麻醉学杂志》
CAS
CSCD
北大核心
2014年第1期116-119,共4页
Chinese Journal of Anesthesiology
关键词
四肢
缺血预处理
休克
出血性
心肌再灌注损伤
Extremities
Ischemic preconditioning
Shock,hemorrhagic
Myocardial reperfusion injury