Waleffe A, Bruninx P, Demoulin J C, Kulbertus H E
Br Heart J. 1977 Apr;39(4):451-5. doi: 10.1136/hrt.39.4.451.
Two cases are described in which, during investigation of rhythm disturbances, it was shown that, by delivering atrial stimuli of increasing prematurity, a point was reached where the artificial stimulus failed to induce an atrial response. However, with even more premature stimulations, atrial responses were again observed. These observations are best explained by a gap phenomenon in which very early stimuli delivered during the effective refractory period of the atria were delayed long enough in the exit area around the pacing electrode to allow atrial recovery.
本文描述了两例病例，在对心律失常进行检查时发现，通过发放提前程度逐渐增加的心房刺激，会达到一个点，此时人工刺激无法诱发心房反应。然而，给予更提前的刺激时，又再次观察到心房反应。这些观察结果最好用间隙现象来解释，即在心房有效不应期内发放的极早期刺激在起搏电极周围的出口区域延迟足够长的时间，以使心房得以恢复。
