Hi, your father is having a rhythm disturbance, an arrhythmia and doctors are trying to correct that. This may not be picked up by ECG,2D-echo and angiography. During the EPS, the electrical behavior of the heart that is responsible for controlling your heartbeat is recorded by placing conducting wires. Radiofrequency ablation, RFA, is a treatment that uses electrical energy to destroy tissues in the heart that are causing rhythm disturbances. This should help to restore his rhythm. Please clear all your doubts with your doctor before the procedure. Good luck.