@kreteman
Asked your cardiologist about using magnesium.

It was recommended to me by my EP. I do take it per their instructions of 400 mg a day. Seems to be a supplement recommended to try by many cardiologists.

I did not see you mention having a EP (Electrophysiologist) whose specific specialty is electrical functions of heart. If you don't have one, I would suggest trying to see one. I would have thought Cleveland Clinic, and your UM would have had you seeing one.

I might have missed you already seeing one so forgive if I missed that.