Radiofrequency catheter ablation (RFCA) is the first-line therapy for various tachyarrhythmias. The authors reports experience of RFCA for various types of tachyarrhythmia in 80 consecutive patients, 85 tracts of ablation, from May 2001 to October 2002. The mean age was 40 years, range 6-81 years. Seventy four and 13 tracts of ablation were supraventricular and ventricular arrhythmia, respectively. The results are shown below. [table: see text] CONCLUSIONS RFCA is an effective method to cure various types tachyarrhythmia. Long-term follow-up should be evaluated in patients with paroxysmal atrial fibrillation.