The EP is right
An ep is an electrophysiologist, a cardiologist who has sub-specialized in cardiac rhythm disturbances.
I would believe that person. Pvcs can originate in the rvot (right ventricular outflow tract) or from anywhere in the left ventricle. There are clues on the ekg which help to pin down the origin and definitive proof can be obtained during electrophsiolgic testing in an ep lab.