I tend to have a 'normal' irregular heartbeat anyway (doc is aware--my heart puts in an 'extra' beat when I inhale) but I have had occasional problems with missed heartbeats. I don't have any concern about the occasional one or two but sometimes if I start getting quite a few (sort of like hiccups) I find that what I need is magnesium, not potassium. I take a chelated magnesium and I find that taking about 1200mg (equivalent) will stop the skipped beats within about 30 minutes. I probably should take more magnesium (and other supplements) more often, but pills tend to make me gag so I don't take supplements regularly. I've recently found a nice liquid supplement that is all natural (organic) and while it doesn't taste particularly good it is tolerable. Being diabetic it's hard to find a liquid supplement that doesn't interfere with my sugars.