Cardiovascular magnetic resonance in myocardial infarction with non-obstructive coronary arteries patients: A review

Table 1 Cardiovascular magnetic resonance diagnostic criteria for acute myocarditis

	Original Lake Louise Criteria	2018 Lake Louise Criteria update
Main criteria	2 out of 3	2 out of 2
	T2-weighted imaging: Regional high T2 signal intensity or global T2 signal intensity ratio ≥ 2.0 in T2 weighted images	T2-based imaging: Regional high T2 signal intensity or global T2 signal intensity ratio ≥ 2.0 in T2 weighted images or regional or global increase of myocardial T2 relaxation time
	Early gadolinium enhancement signal intensity ratio myocardium/skeletal muscle of ≥ 4.0	T1-based imaging: regional or global increase of native myocardial T1 relaxation time or extracellular volume or areas with high signal intensity in a nonischemic distribution pattern in gadolinium enhancement images
	Late gadolinium enhancement: areas with high signal intensity in a nonischemic distribution pattern
Supportive criteria (not necessary nor sufficient for diagnosis)	Pericardial effusion	Pericardial effusion or High signal intensity of the pericardium in late gadolinium enhancement, T1- or T2-mapping
	Left ventricular wall motion abnormality	Systolic left ventricular wall motion abnormality

Adapted from Ferreira et al[29].