This article from Cardiology Advisor claims that:
The risk of developing acute coronary syndrome (ACS) significantly increased in patients after receiving mRNA COVID-19 vaccines, according to a report presented at the American Heart Association (AHA) Scientific Sessions 2021, held from November 13 to 15, 2021.
and:
The study author concluded that “mRNA [vaccines] dramatically increase inflammation on the endothelium and T cell infiltration of cardiac muscle and may account for the observations of increased thrombosis, cardiomyopathy, and other vascular events following vaccination.”
Reference
Gundry SR. mRNA COVID vaccines dramatically increase endothelial inflammatory markers and ACS risk as measured by the PULS cardiac test: a warning. Presented at: AHA Scientific Sessions 2021; November 13-15, 2021. Poster VMP41.
You can view the article here: