Mapping methodology of radiofrequency catheter ablation on patients with idiopathic ventricular tachycardia

Objective To study mapping method of radiofrequency catheter ablation(RFCA)on patients with idiopathic ventricular tachycardia(IVT).Methods Fifty-two patients under gone RFCA were mapped.Right-ventricle-pacing method was performed on 39 cases with IVT originated from right ventricle.Ablation target site was determined when the 12-lead pacing electrocardiogram displayed QRS wave with the shape and amplitude identical to that of the IVT running.In 12 patients with IVT originated from left ventricle,activation sequence mapping was used,in order to detect a potential of high frequency and low amplitude using the ablation catheter,when the potential was the earliest of the QRS waves of standard surface electrocardiogram,at least 20 ms ahead,the ablation target site was determined.The pacing method was performed on 1 patient with idiopathic left ventricular tachycardia.Results Success ratio of RFCA was 100%(13/13)in idiopathic left ventricular tachycardia,and 94.87%(37/39)in idiopathic right ventricular tachycardia,respectively.Conclusions The activation sequence mapping method is suitable for patients with idiopathic left ventricular tachycardia and the pacing mapping method is suitable for patients with idiopathic right ventricular tachycardia.