QT间期离散度与心肌梗死患者左心功能及心律失常的关系

应用超声声学定量技术和动态心电图观察QT间期离散度（QTd）对冠心病亚急性及陈旧性（伴再发心绞痛）心肌梗死患者左心功能和心律失常的影响。结果发现，心肌梗死组的QTd较正常组明显延长（P＜0．01）；其左室收缩功能与舒张功能与正常对照组相比亦受损。心肌梗死合并室性心律失常组与合并窦性心律组相比，前者QTd明显延长（P＜0．01）；心肌梗死合并室性心律失常组的左室收缩功能与舒张功能与心肌梗死合并窦性心律组相比亦受损。由此可见，冠心病亚急性及陈旧性（伴再发心绞痛）心肌梗死患者QTd延长，QTd的延长可能与左室收缩功能与舒张功能的受损及心律失常的发生有关。

Influence of QTd on Left Ventricular Function and Cardiac Arrhythmias in Myocardiol Infarction Patients

Using acoustic quantification(AQ)techonology to observe influence of QTd on left ven-tricular function in 51 cases of myocardiol infarction patients.Using 24 hours dynamic electrocardiogram (DCG)to detect cardiac arrhythmias in 43/51 cases of myocardiol infarction patients,and compared with 30cases of normal control subjects.The results showed that QTd in myocardial infarction(MI)patients was signifficantly longer than that in normal group(P<0.01),and the left ventricular systolic and diastolic function were also demaged compared with normal group.QTd in MI accompanying cardiac arrhythmia group was signifficantly longer than that in MI accom-panying sinus rhythm group(P<0.01),and left ven-tricular systolic and diastolic function in MI accompa-nying cardiac arrhythmia group were demaged com-pared with MI accompanying sinus rhythm group.It is concluded that QTd in MI patients was longer,and it may have relationship with left ventricular dysfunc-tion and the incdence of cardiac arrhythmia in myocar-diol infarction patients.