Kao T, Yu B C, Kong C W, Chen C Y, Chiang B N
Institute of Medical Engineering, Yang-ming Medical College, Taipei, Taiwan, R.O.C.
Pacing Clin Electrophysiol. 1988 Aug;11(8):1168-75. doi: 10.1111/j.1540-8159.1988.tb03968.x.
A noninvasive method employing the technique of signal averaging has been developed for recording sinoatrial (S-A) activity (pre-P wave). Recordings were obtained in man at the time of right heart catheterization. A bipolar esophageal electrode was utilized to record the prominent P waves that were used for triggering in the averaging process. After summing 150 beats, which had coefficients of correlation 0.97 or larger, deflections of small amplitude (less than 40 microV) were obtained preceding the atrial activity. Direct catheter recordings were also taken for comparison. With the new noninvasive method, the sinoatrial conduction time (SACT) estimated for patients with sick sinus syndrome (SSS) was 106 +/- 24 ms (101 +/- 20 ms for the same group measured directly). The SACT for healthy subjects used as the control group was 55 +/- 18 ms. There was good correlation between the pre-atrial activity recorded noninvasively by the esophageal electrode method and invasively from the direct catheter method. The linear correlation coefficient between these two techniques was 0.89 (P less than 0.001) in 17 patients.
已开发出一种采用信号平均技术的非侵入性方法来记录窦房（S-A）活动（P波前）。在右心导管插入术时对人体进行记录。使用双极食管电极记录用于平均过程触发的明显P波。在对150次相关性系数为0.97或更大的搏动进行求和后，在心房活动之前获得了小幅度（小于40微伏）的偏转。还进行了直接导管记录以作比较。采用新的非侵入性方法，病态窦房结综合征（SSS）患者的窦房传导时间（SACT）估计为106±24毫秒（同一组直接测量为101±20毫秒）。作为对照组的健康受试者的SACT为55±18毫秒。食管电极法非侵入性记录的心房前活动与直接导管法侵入性记录之间存在良好的相关性。在17例患者中，这两种技术之间的线性相关系数为0.89（P<0.001）。
