5 cases were revealed in the AAI pacing group(5/83,6.02%),2 cases in the DDD pacing group(2/193,1.04%),and 2 cases in the VVI pacing group(2/814,0.25%).

• 双腔起搏 2例 ；发生率为 1.；0 4%25 (2 / 193) ; VVI起搏 2例；发生率为 0