Covid-19 vaccine: four years later, the list of persistent symptoms is growing – Page 7

10. Arrhythmias and palpitations (non-myocarditis cardiac events)

What: Heart rhythm disturbances post-vaccination sometimes reported; many are benign and transient.
Which vaccines: Reported across types in surveillance data.
How common: Uncommon; often self-limited and investigated to rule out myocarditis.
Multisystem inflammatory syndrome (MIS)-like presentations
- What: Hyperinflammatory syndrome (more commonly reported after infection, rare after vaccination).
- Which vaccines: Mostly linked to SARS-CoV-2 infection; very rare vaccine-associated reports exist and are investigated.
- How common: Extremely rare.
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