目前国内普遍使用是单导联心电图机。一份完整心电图必须顺次记录法定的12个导联,而且每个导联记录不能短于3秒。有些疑难心律失常,为了观察其演变规律,需要延长记录某个或几个导联,这样既能解决问题又能节约图纸。 Currently widely used is the single lead ECG machine. A complete cardiogram must be recorded sequentially with the legal 12 leads, and each lead can not be recorded less than 3 seconds. Some difficult arrhythmia, in order to observe the evolution of the law, you need to extend the record of one or a few leads, this will not only solve the problem but also save the drawings.