thedy

Hi, I am wondering how vagus nerve influence heart beats.The problem is,that I do not understand why vagus nerve irritation makes atrial extrasystoles.Because as I know,vagus nerve inhibit heart rythm. So how is it? What is the mechanism by which vagus or parasymphathetic causes extrasystoles or premature beats?If I irritate vagus I inhibit rythm,not even to make more beats.......Sympathetic irritation gives more logic to cause extrasystole,but parasympathetic??? Thanks for answers and sorry for my english.