Replied by Timh (Louisville, Ky) on 05/07/2012
Sam. There is a form of cardio myopathy associated w/ Selenium deficiency, other supplements include: Hawthorn, Ginger/Cayenne, Ginkgo, CoQ10 or Ubiquinol, Carnitine, D-Ribose, Coenzyme 1 (NADH), Magnesium.
Here is a link to heart page:
https://www.earthclinic.com/CURES/chest_pain.html
Hope this helps and good luck.