Successful radiofrequency catheter ablation of idiopathic ventricular fibrillation presented as recurrent syncope and diagnosed by an implanted loop recorder.

As a palliative therapy, an implantable cardioverter-defibrillator (ICD) could not prevent the occurrence of ventricular tachycardia or fibrillation (VT, VF), but only suppress it by overdrive pacing or direct current shocks. Recurrent VT or VF followed by frequent ICD shocks might thus put patients in a painful disaster. We presented a case of recurrent syncope diagnosed as recurrent VF by an implanted loop recorder (ILR). The VF was eliminated by radiofrequency catheter ablation (RFCA) of triggering ventricular premature complexes (VPCs).