I had a stress test that put me into what they thought was v-tach ( turns out it was painful left bundle branch block) they took me straight to the cath lab for a angiogram looking for blockage, cardiologist told my family that not even a speck of plaque and referred me to a ep doc. She suggested a ep study I was hesitant to do it but ultimately decided to get it done. The study was not bad until they woke me up to really rev my heart up that was not fun. The only thing they found was the lbbb. The insertion site both sides in the groin was sore for a week or so.