PR间期与二尖瓣返流和左心室充盈的关系

目的 探讨异常PR间期对舒张期和收缩期二尖瓣返流的影响及对左心室充盈的影响。方法 选择心房心室分离患者为模型，采用数字化超声心动图技术观察PR间期与二尖瓣返流及左心室舒张期前向血流充盈时间的关系。结果 PR延长达一定程度将引起二尖瓣舒张期返流，本例患者PR间期临界宽度为0．27S；在一定范围内PR越长则二尖瓣舒张期返流持续时间越长；PR越长，舒张期前向血流充盈时间越短。结论 PR延长是形成二尖瓣舒张期返流的重要条件；同时，PR延长使左心室充盈时间显著缩短。

The relations between PR interval and mitral regurgitation as well as left ventricular filling

Objective To study the influence of abnormal PR interval on mitral regurgitation and left ventricular filling.Methods Selectting AV dissociation patient as test model,using digital echocardiography skill to observe the relationship between PR interval and mitral regurgitation as well as diastolic left ventricular forward flow filling times.Results When prolonged to some extent, the long PR interval will induce diastolic mitral regurgitation,the critical interval is 0.27S in the model patient.In a certain rang,the longer the PR interval,the longer the duration of the diastolic mitral regurgitation;the longer the PR interval,the shorter the left ventricular forward flow filling time.Conclusions long PR interval is an important condition to form diastolic mitral regurgitation;besides,long PR interval can reduce left ventricular filling significantly.