Lots of folks get pericarditis. When the amount of fluid between the heart and the pericardial sac is large...it can restrict the hearts ability to pump blood. Could the vaccine have exasperbated the problem.?..perhaps...but it more likely would have been apparent shortly after the vaccine administration.
Since it is known that the vaccine can affect the heart...they should do a study to measure biochemical evidence and physical evidence of any changes to the heart health post vaccination...to see if the heart issues develop and when and how serious it is.
“...they should do a study...”
The last thing they want to do is find any relationship to an adverse reaction.
Pfizer has been caught altering research data. Maybe they could do a study just to alter the data to fit their need.