One of the Mayo Clinic cardiology team members who took care of me three years ago said something very useful. If I experience pain in the heart area (which I rarely do), it means the heart muscle is not getting enough oxygen and to take some deep breaths. I do this and it works well. I was wondering if this would also help with palpitations. I have some of these but not many, and I just tell my heart to calm down. I don't think they are that bothersome in my case.