CARTO电压标测识别猪急性心肌梗死模型中存活心肌的研究

目的 研究应用CARTO电压标测的方法识别猪急性心肌梗死模型中存活心肌的准确性和实用性.方法 用普通家猪13头,麻醉气管插管后行冠状动脉造影术,置入经皮腔内冠状动脉成形术球囊至冠状动脉左前降支远端,堵闭血流60～90 min,建立家猪心肌梗死模型.采用CARTO电压标测系统构建左心室,通过电压标测识别存活心肌.处死试验动物取出心脏,将心肌组织切成薄片后采用氯化三苯基四氮唑(TTC)染色法识别存活心肌.CARTO电压标测识别存活心肌的标准为0.5～1.5 mV为存活心肌,TTC染色存活心肌呈淡红色.将CARTO电压标测的结果与TTC染色结果进行对比.结果 所有猪均完成冠状动脉左前降支远端的封堵,2头分别在堵闭45和65 min时因心室颤动死亡.存活11头猪成功地建立急性心肌梗死模型.将猪的左心室分为16个节段,11头共176个节段,分别通过CARTO电压标测与TTC染色法对各节段心肌进行识别并评价两种方法的一致性,两者的一致性较好(Kappa=0.816,P＜0.001).以TTC染色检测出的存活心肌为标准,CARTO电压标测检测存活心肌的敏感度为71.8%,特异度为96.5%;准确度为90.9%.结论 运用经皮腔内冠状动脉成形术球囊封堵冠状动脉可成功建立猪急性心肌梗死模型.通过CARTO电压标测系统能够识别出模型中的存活心肌,为检测存活心肌提供了一个新的方法.

Viable myocardium detecting by CARTO voltage mapping in swine model of acute myocardial infarction

Objectiye To evaluate the accuracy and practicability of detecting viable myocardium by CARTO voltage mapping in swine model of acute myocardial infarction(MI). Methods MI was induced in 13 anesthetized swines via occluding the distal of left anterior descending coronary arteries by angioplasty balloon for 60-90 minutes. The viable myocardium detection by CARTO voltage mapping was made after reconstruction of the left ventricle using CARTO and the results were compared with TTC staining. The standard of CARTO voltage to detect viable myocardium was 0. 5 - 1.5 mV while viable myocardium showed pink color by TTC staining. Results Eleven out of 13 swines survived the operation and 2 swines died of ventricular fibrillation at 45 and 65 minutes post ischemia. Left ventricle was divided into 16 segments and 176 segments from 11 swines were analyzed. Viable myocardium detected by CARTO voltage mapping was identical as identified by TTC staining(Kappa =0. 816,P ＜0. 001). Taken the TTC result as standard, the sensitivity, specificity and accuracy rate of CARTO voltage mapping are 71.8%, 96.5% and 90.9%respectively. Conclusion CARTO voltage mapping could be used as a reliable tool to detect viable myocardium in this model.