Do the #DiedSuddenly folks have a specific kind of cardiovascular damage they can look for before anything happens and an explanation of how/why it's occurring? Something that would allow them to distinguish between the MRNA vaxed and unvaxed?
Now the Anti-Vaccine World is Mad at ‘Died Suddenly,’ The Viral Anti-Vax Documentary

Predictable in-fighting, claims of psyops, and renewed arguments about snake venom. 

@wjmaggos can't speak for that documentary because I haven't seen it. I generally avoid anything related to Stew Peters.
The go-to tests I've seen mentioned by people I actually trust are d-dimer (for micro blood clotting) & troponin levels (for heart damage).
There are other concerns, but those are specifically the heart-related ones I've seen come up in discussion.
People forget that there are proprietary ingredients, unknown quality control, and doctors have been punished for reporting adverse events.
The only way to conclusively know in any instance are random independent autopsies. Anything else is just show.