Isochrones were displayed both during sinus rhythm and AF.Results During sinus rhythm,the atrial excitation wave front begins from sinus node spreading to right atrium(RA)and left atrium(LA). 在开胸状态下，使用自制的心外膜标测电极及信号采集系统分别对窦性心律及急性房颤心律进行心房心外膜标测，绘制等时图。
In the mathematical theory of dynamical systems, an isochron is a set of initial conditions for the system that all lead to the same long-term behaviour.