In patients with normal coronary arteries, the CMR was done as soon as the clinical situation allowed during the same hospitalisation using the 1.5-Tesla MRI scanner (Siemens Magnetom Avanto) with phased-array body coil, ECG monitoring and enhancing contrast Gadovist, Bayer Schering Pharma, Berlin, Germany and dedicated syngo.via MR Cardiac Analysis software. Diagnosis of acute myocarditis was confirmed according to the updated 2018 Lake Louise criteria on the whole population [1 (link), 7 (link), 21 (link), 25 (link)]. According to the protocols recommended by the Society for the Cardiovascular Magnetic Resonance, regional or global myocardial oedema and non-ischaemic myocardial injury were identified as areas of high-signal intensity T2-weighted imaging and the regional late gadolinium enhancement (LGE) signal increase, respectively [26 (link)].
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