My MIL was sick a few weeks ago and tested negative for Covid, but had many of the symptoms of the variant that seems to be going around (she was tested around day 6 of symptoms).
She was just taken to the hospital last night with stroke symptoms - mostly aphasia. They did all kinds of testing on her and her troponin levels were high, continued to rise, and now have started to drop. I haven't had time yet to see if there's a connection between Covid and troponin, plus she did test negative but it seems like quite a coincidence.