intermediate course

The main idea is that one intermediate track is added to the current common track initiation model,and that the whole track initiation process is processed by stages,for which different track initiation methods and thresholds are used.

其主要思想是在归纳现有普通航迹起始模型的基础上,在模型中增加了一级中间航迹,并对整个航迹起始过程进行了分阶段处理,在不同的处理阶段采用不同的航迹起始方法和门限。

Objective To discuss the influence of preexcatation syndrome on QRS middle vector and its clinical significance.

目的　探讨预激综合征对QRS中间向量的影响及临床意义。