食管心房调搏时食管电极放置的探讨

The Orientation of Esophageal Electrode During Atrium Pacing

在对57例受检者实施食管心房调搏过程中,分别在 P 波呈向下、双向及向上3种波形情况下固定电极进行起搏,以探讨最佳起搏部位。发现起搏成功率(依次为87.72%、82.46%、91.23%)及起搏阈值(依次为24.83±4.82,24.07±5.44,23.91±4.24 V)分别相互进行比较,差异无显著性。进而固定起搏阈值20 V,在食管电极插入过程中记录到 P 波后,边起搏边调整电极位置,所有病例均能成功起搏,且3种 P 波出现机率相等。表明起搏阈值与心电图波形无关,只要食管导联记录到 P 波便可起搏,不必强求一定波形。

An optimum pacing position was explored during the procedure of transesophageal atrium pacing and the pacing was switched on according to three situations of electrode:P wave upward,double phase and downward.It was found that no difference existed in effective pacing rates (87.72%,82.46%,91.23%,respectively) and thresh- olds (24.83±4.82,24.07±5.44,23.91±4.24 V,respectively) in 57 cases,Choosing threshold at 20 V,the hearts of all cases were successfully paced as soon as the atrium activity appeared after the esophageal electrode was plugged in while the pacing was triggered as the adjustment of electrode position.Three kinds of P waves' probà- bilities of effective pacing were not different.This study shows that there is not relationship between the pacing threshold and the P wave figure.Pacing can be performed immediately after the atrium electrical activity was recorded on esophageal lead.