Aubert A E, Goldreyer B N, Wyman M G, Denys B G, Ector H, De Geest H
Am J Cardiol. 1987 Mar 1;59(6):610-4. doi: 10.1016/0002-9149(87)91179-9.
To compare the sensing characteristics of a solid tip, target tip (Medtronic) and orthogonal electrodes within the right atrial appendage, atrial electrograms were simultaneously recorded from 2 pacing leads in 11 patients. No significant differences were noted between atrial electrograms derived from target tip or a solid tip electrode in contact with atrial myocardium. Mean values for P-wave amplitudes of 3.0 vs 3.1 mV and slew rates 0.4 V/s vs 0.6 V/s, and QRS amplitudes of 1.0 vs 1.2 mV and slew rates 0.4 vs 0.2 V/s were obtained. The frequency content was also similar, with spectral maxima at 8 vs 9 Hz (P wave) and 7 vs 6 Hz (QRS). In contrast, atrial electrocardiograms derived from the orthogonal electrodes were significantly different: P-wave amplitude of 6.1 mV (p less than 0.025) and slew rate of 1 V/s and QRS of 0.13 mV and slew rate of 0.04 V/s. Spectral analysis was also dissimilar with maxima at 34 Hz (P wave) and 3 Hz (QRS). Orthogonal noncontacting sensing electrodes positioned within the atrial appendage offer substantially better electrographic P-wave amplitude detection and QRS rejection than contacting tip electrodes. These leads yield a significant improvement when discriminate atrial sensing is required.
为比较实心电极头、目标电极头（美敦力公司）及右心耳内正交电极的感知特性，对11例患者的2根起搏导线同步记录心房电图。源自目标电极头或与心房心肌接触的实心电极头的心房电图之间未发现显著差异。获得的P波振幅平均值分别为3.0 mV对3.1 mV、上升速率为0.4 V/s对0.6 V/s，QRS振幅平均值分别为1.0 mV对1.2 mV、上升速率为0.4对0.2 V/s。频率成分也相似，P波频谱最大值分别为8 Hz对9 Hz，QRS为7 Hz对6 Hz。相比之下，源自正交电极的心房心电图显著不同：P波振幅为6.1 mV（p小于0.025）、上升速率为1 V/s，QRS为0.13 mV、上升速率为0.04 V/s。频谱分析也不同，P波频谱最大值为34 Hz，QRS为3 Hz。置于心耳内的正交非接触感知电极在P波振幅检测和QRS波抑制方面比接触式电极头有显著更好的表现。当需要鉴别心房感知时，这些导线会带来显著改善。
