I have just returned from a second cardioversion, heart normal at moment. This time I went in after being on one of those high powered drugs for a month, amiodarone, 400 mg. Taking this drug should ensure the cardioversion holds—dosage necessarily reduced to 200 mg from now on. NO serious side effects that I couldn’t live with for a little while. Having a second ablation with electrophysiologist this spring when hospitals clear. My first ablation lasted 3 years. Easiest invasive procedure I have ever had. So my experience has been very good. Good luck.