I have had a dual chamber pacer since I was 25. I'm 54 now. Six months ago, my NEW cardiologist shut off the
Ventricular side of the Dual chamber device because the leads eroded & were no longer pacing. Since that event, I have recurring episodes of a strained feeling (tightness) after any type of activity. Sometimes, labored breathing. A recent stress test showed no abnormalities. Nevertheless, I'm always uncomfortable, whether laying down or not.