Abstract:Double heart rhythm which is formed by incomplete atrioventricular block accompanied with escape rhythm refers to that when the atrioventricular junction is suitable for conduction, atrioventricular conduction is delayed or partly blocked, resulting in the escape impulse by lower potential pacemaker. When the escape impulse is continuously sent three times or more, escape rhythm is formed. It only includes two kinds of rhythms, one from atrioventricular junction, and another from ventricle. In this paper, by analysing 7 cases of electrocardiogram which are in accord with the characteristics of double heart rhythm introduced above, it indicates that the incomplete atrioventricular block complicating lower potential escape rhythm is mainly second or high degree atrioventricular block, however, first degree atrioventricular block is unlikely complicated by escape beat from lower potential pacemaker. The appearance of the double heart rhythm indicates that we should attach importance to the treatment of primary diseases, the improvement of atrioventricular conduction, and the protection of escape rhythm. Meanwhile, the dynamic changes of electrocardiogram should be closely observed. Once the degree of atrioventricular block is aggravating and the corresponding circulation function declines, the installation of artificial cardiac pacemaker should be considered.