I have had irregular heartbeat on and off since i was in my late 20's. Iam now in my 70's and they have become much worse. I have had several 24 hour halter monitors. So far i have been told i have SVT, premature heartbeats etc. My last 24 hour monitor showed 500 events. The doctor just blew it off. I sometimes find that a walk stops the irregularity. I take propanolol for it.