房室旁道电位的电生理特征及临床意义

以冠状窦内导管或大头消蚀导管记录10例预激综合征患者的房室旁道(AP)电位。8例前传AP电位均起源于同步ECG delta波前0～20ms,平均波幅为0.78 mV,A-AP间期多在30 ms以内,AP电位在V波前15 ms以上。4例逆传AP电位的平均波幅为0.46 mV,V-AP及AP-A分别为52 ms及34 ms。记录AP电位有助于房室旁道的准确定位及其传导特性的研究。

The Electrophysiologic Characteristics of Atrioventricular Accessory Pathway Potential and Its Clinical Significance

The atrioventricular (AV) accessory pathway (AP) potential in 10 patients with Wolff-Parkinson-White syndrom was recorded with close-space catheter in coronary sinus or largetip radiofrequency ablation catheter directly in the left ventricule. The potentials were recorded in eight patients during sinus rhythm. The atrium-pathway interval (A-AP) was29.4±9.4ms, APdelta wave interval 10.0±6.5ms and AP-ventricle interval 20.7±0.90ms. The amplitude of the AP was 0.78±0.41mV, Five AP potentials was recorded during AV reentrant tachycardia and the mean amplitude was 0.46±0.36mV. The ventricle-AP interval (V-AP) and AP-strium interval (AP-A) was 52.2±20.5ms and 34.0±23.0ms respectively. The sites of APs were determined by ablation catheter. All the pathways were blocked With radiofrequency ablation and AP potential disapeared in the same time. The results suggested that AP potential is an excellent marker for the location of accessory pathway and ablation.