HI gd, yes AA can easily affect your heart! Have called emergency services a couple of times, found paramedics more sympathetic than hospital doctors!
My attacks were linked to difficulty with breathing due to muscle cramps around chest, which I now have every day.
Not very helpful, I know -
Re documented evidence, search in PubMed, this link explains what they're about!!!
en.m.wikipedia.org/wiki/PubMed
Best wishes Helen x