NCIt definition : Atrial fibrillation in a patient without prior history of atrial tachyarrhythmias
that started during probable or confirmed acute COVID-19 and persisted beyond four
weeks after the initial diagnosis of COVID-19.;
Alternative definition : ACC/AHA: AF in a patient without prior history of atrial tachyarrhythmias that started
during probable or confirmed acute COVID-19 and persisted beyond 4 wk after the initial
diagnosis of COVID-19. Preexisting cardiovascular conditions, or those that did not
develop until after COVID-19 had resolved, should not be listed here.;