小型猪冠状动脉再狭窄模型中普通肝素用量的探讨

目的:评价低、中度肝素化在小型猪冠状动脉再狭窄模型中的应用效果,探讨该模型合理的普通肝素用量。方法:根据普通肝素用量将24只健康小型猪随机分为低度肝素化组(100U/kg)和中度肝素化组(150U/kg)。分别测定基础活化凝血时间(activating clotting time,ACT)值和静脉注射肝素后不同时间点ACT值。比较2组的抗凝效果,术后压迫止血情况及术中、术后24h的安全性。结果:中度肝素化组和低度肝素化组在静脉推注普通肝素后5minACT达到峰值〔(315.1±50.85)svs(276.2±59.38)s,P=0.110〕,20min时2组均维持较高ACT值,但中度肝素化组明显高于低度肝素化组〔(284.8±45.14)svs(206.3±32.44)s,P=0.003〕。60min时中度肝素化组仍维持较高的ACT值(193.9±21.87)s,而低度肝素化组ACT值明显回落(132.2±13.30)s,与前者相比差异有统计学意义(P0.001)。中度肝素化组术后徒手压迫止血时间显著长于低度肝素化组有〔(17.3±2.06)minvs(13.5±2.94)min,P=0.006〕。总体手术平均时间为(13.2±2.34)min。2组术中和术后24h均未发生冠状动脉事件。结论:在小型猪冠状动脉再狭窄模型中,若手术时间控制在20min内,则低度肝素化(100U/kg)既可保证手术的安全性又可缩短压迫止血时间。

The dose investigation of unfractionated heparin in minipig model for coronary artery restenosis

Backgroun:Currently,the investigation of new drug eluting stent is paid more attention.The use of the juvenile Chinese experimental mini-pigs model for coronary artery restenosis is increasing.In the past,The procedure needed under general anesthesia and tracheal cannula.We had to do femoral artery arteriotomy to creat the femoral approach.The time was long and the dose of unfractionated heparin in the model was high(about 200 U/kg) so as to keep a appropriate anticoagulation effect.As a result,the incidenc...