I can't help much since I am not well educated with this topic, but there is likely to be a familial component to high CAC. There are, I believe, known genetic markers for high CAC, and maybe it would help to pinpoint which, if any, you have. From there, a diet might help, or some other intervention that is unknown to me, possibly statin. If anyone has determined your CHADs-VASC score due to the transient AF, you might be better off in the long run with a DOAC (Direct Oral Anti-Coagulant) such as apixaban, perhaps only with a baby aspirin each day...but do get that squared away in your inteview.