[Preliminary experience in radiofrequency ablation of left-side atrioventricular accessory reentrant tachycardia]

Left side atrioventricular accessory reentrant tachycardias (AVRT) were ablated in 25 cases. The pathways were 5 (20%), 15 (60%) and 5 (20%) in left anterior, lateral and posterior wall respectively. Accessory pathway potentials (AP) were recorded in 16 (64.0%) cases. Most APs were recorded on the anterior side of the earliest atrium activation (EAA). The atrial side of accessory pathway is anterior to the ventricular side. The V and A wave were almost confused on the local area of successful ablating, and the average VA time is 35.5 +/- 7.8 ms, and in those cases whose VA time was less than 30 ms was 48%. The power of successful ablating is 36.9 +/- 6.0 W, the current is 0.58 +/- 0.1 A, impedance is 110.3 +/- 11.9 omega. The area of accessory pathway could be detected accurately through the findings of AP and EAA.