Baseline AERP and AERPs after pacing 2,4,6 h were determined in all groups at driver cycle length(DCL) of 200 ms,150 ms and 130 ms.

• 在基础状态和快速心房起博后2、4、6 h,分别测定各组基础起搏周长为200 m s、150 m s、130 m s时的心房有效不应期(AERP)。