[Correspondence] COVID-19 and myocardial infarction

Ioannis Katsoularis and colleagues1 found that COVID-19 is a risk factor for myocardial infarction and stroke through self-controlled case series evaluation, a method that has been used to establish the risk of myocardial infarction associated with influenza infection.2,3 Regarding myocardial infarction, as the investigators recognised, one of the possible limitations of this research is the inaccurate diagnosis and codification of myocardial injury or myocarditis as myocardial infarction, particularly because the current myocardial infarction definition (and diagnostic methods) differ from the definition at the time of the registry outcome validation study.