Table 2.

Diagnostic classification for patients with myocarditis

Criteria	Pathological Confirmation	ECG or Imaging
Possible subclinical acute myocarditis	Absent	Needed
In the clinical context of possible myocardial injury without cardiovascular symptoms but with at least 1 of the following
Biomarkers of cardiac injury raised
ECG findings suggestive of cardiac injury
Abnormal cardiac function on echocardiogram or cardiac MRI
Probable acute myocarditis	Absent	Needed
In the clinical context of possible myocardial injury with cardiovascular symptoms and at least 1 of the following:
Biomarkers of cardiac injury raised
ECG findings suggestive of cardiac injury
Abnormal cardiac function on echocardiogram or cardiac MRI
Definite myocarditis	Needed	Not needed
Histological or immunohistological