冠状动脉内多普勒技术评价急性冬眼心肌动物模型冠状动脉血流动力学特点

Assessing the characteristics of coronary hemodynamics in acute hibernating myocardium animal model by intracoronary doppler

目的 闭胸法建立急性冬眠心肌动物模型 ,评价其冠状动脉 (冠脉 )血流动力学特点。方法 将 13只小型中国家猪制备成急性冬眠心肌模型 ,采用冠脉内多普勒技术检测模型制备前后、有效复灌后冠脉平均峰值流速 (APV)、舒张收缩流速比值 (DSVR)、冠脉血流速度储备 (CFVR)等指标的变化。处死实验动物 ,对心肌行病理观察。结果 10只实验动物 (76 92 %)成功制备成模型 ,病理检查未见心肌细胞坏死。急性冬眠心肌动物模型相关冠脉狭窄远端的APV、CFVR均明显低于正常水平 [(4 5 6± 2 2 3)cm svs (2 2 13± 7 99)cm s,P <0 0 1];[(0 95± 0 2 2 )vs (2 37± 0 4 2 ) ,P <0 0 1],复灌后均明显改善 [(10 14± 2 11)cm svs (4 5 6± 2 2 3)cm s ,P <0 0 1];[(1 34± 0 19)vs (0 95± 0 2 2 ) ,P <0 0 1],但仍明显低于正常水平 (P <0 0 1) ,DSVR始终无明显改变。结论 急性冬眠心肌动物模型相关冠脉的APV、CFVR明显降低 ,有效的复灌在早期可使冠脉循环得到一定程度的改善。

Objective To observe the characteristics of coronary hemodynamics in acute hibernating myocardium (AHM) model by intracoronary doppler guidewire. Methods 13 little domestic Chinese swine were established to the model of AHM by interventional method (closed chest),intracoronary Doppler guidewire were used to measure average peak velocity (APV),diastolic systolic velocity ratio (DSVR) and coronary flow velocity reserve (CFVR) distal to the stenosis in the period of pre model,post model and reperfusion.Then animals were executed,the histomography changes of AHM cells were observed.Results 10 animals (76 92%) were established to the model of AHM successfully,myocardium necrosis were not found under microscopical examination.APV and CFVR distal to the stenosis decreased significantly in AHM model ( P <0 01),while partially improved after reperfusion ( P <0 01),DSVR didn′t change obviously.Conclusion APV and CFVR decreased significantly in AHM model,and reperfusion early can improve the function of coronary circulation partially.