Does this perhaps explain the autopsy findings in two adolescents who died after pfizer shots? https://meridian.allenpress.com/aplm/article/doi/10.5858/arpa.2021-0435-SA/477788/Autopsy-Histopathologic-Cardiac-Findings-in-Two

"Catecholamines also are a potential source of oxygen-derived free radicals which can interfere with sodium and calcium transporters, possibly resulting in myocyte dysfunction through increased transsarcolemmal calcium influx and cellular calcium overload".