A 16-year-old patient suddenly had a seizure during the examination at the military base palpitation. On the ECG, the following is observed: the rhythm is correct, the heart rate is 180 per 1 min, the PQ interval is 0.08 c. The QRS is slightly widened, on the rising knee of the R wave there is a delta wave, attacks heart palpitations bother often. What type of invasive intervention is indicated in this case?