Heart Dr. says I have Supraventricular tachycardia, or paroxysmal SVT,I have been noticing irregular heartbeats off & on this week especially while at rest but have no other smytoms? I'm on metoprolol er 50mg & a potassium pill at 20mg was wondering what could cause them also was wondering how to make them go away? Dr doesn't seem to concern! I seen him a couple weeks ago! I'm 33 & overweight & do have sleep apnea so was wondering if that had to do with it! Also I had heart surgery when 3 yr old on Arotic Valve? Some come & go but others last a fees mins longer! Thanks!