Hi,
Dont know if this is old news, but found an excellent cardiologist on you tube from York UK. Having struggled to get a cardiologist to understand my stomach and heart problems are related I came across this guy who not only acknowledged it, but also explained in. He has lots of videos on heart including A fib, SVT, ectopics, palps and explains what they are and how to identify them. He also has a video on magnesium and I am now giving them a go. Check him out!