CMR image analysis:
The acquired CMR images were independently analyzed by two cardiac radiologists with 12 and 10 years of MRI diagnosis experience. Discrepancies in the analysis of the two radiologists were adjudicated by a senior radiologist having 20 years of experience in MRI diagnosis. The CMR images were post processed and cardiac chamber volumes, mass and function were measured using software based automated cardiac contour detection along with manual correction if required. All the image sequences were analyzed as per the 16-segment model proposed by the American Heart Association.13 The location as well as the pattern (epicardial, mid-wall, or transmural) of LGE were assessed independently by two observers. The global T1/T2 values were computed by manually delineating the entire LV myocardium on the T1/T2 map. Myocarditis was diagnosed based on the 2018 revised Lake Louis criteria (LLC)14 in the presence of both of the main criteria: (1) myocardial edema (T2 mapping or T2 darkblood TIRM-Sequences) and (2) non-ischemic myocardial injury (abnormal T1, ECV or LGE).