It is a convenience ways for measuring the value of Pwd detected through various doctors at same time or one doctor at different time. Paper speed have no correlation to the value of Pwd.

• 采用不同人同一时间测量以及同一人不同时间测量的方法得出的Pwd具有较高的可靠性和较好的重复性 ,心电图的走纸速度对Pwd值的测定影响不大