与逆钟向折返的房扑相比,顺钟向折返的房扑发生率较低,其折返波锋沿房间隔正向前传,沿右房游离壁逆向上传,而缓慢传导区仍位于下腔静脉与右房下部的欧氏瓣及其邻近部位。结果在心电图形成下壁Ⅱ、Ⅲ、aVF导联的F波直立,V_1导联的F波为负向。应当注意,正常时右房的电激动向左房突破的部位有三处,分别 Compared with atrial flutter reversed by reverse clock, the incidence of atrial flutter followed by a clockwise turn was lower, and the reentry wave front moved forward along the atrial septum and reversely along the free wall of the right atrium while the slow conduction region was still located in the lower cavity Veins and the lower right Eurasian valve and its adjacent parts. Results In the electrocardiographic inferior wall Ⅱ, Ⅲ, aVF lead wave F upright, V-lead F wave is negative. It should be noted that the normal right atrial electrical stimulation to the left atrial break through the site there are three, respectively