A pacemaker (AOO) was implanted in a subcutaneous pocket and attached to a screw-in epicardial lead in the right atrial appendage. The dogs in pacing group were paced at 400 bpm for 6 weeks.

• 在右心耳缝植螺旋型起搏电极,连接实验用AOO高频起搏器(400次/min),心房快速起搏6周,建立房颤犬模型;