CMR parameters based on severity of COVID-19 illness:
A significant proportion of severe COVID-19 patients had abnormalities on CMR as compared to mild and moderate cases. In terms of the conventional CMR parameters, there was a significant difference in only LVEF, LVEDV among the three groups based on severity of COVID-19 illness (Supplementary table 1). Myocardial native T1 values of severe COVID-19 patients were significantly higher as compared to mild and moderate COVID-19 patients (mild: 1253.9+ 35.6 ms vs moderate: 1283.2+ 37.6 ms vs severe: 1309.9+ 38.1 ms; P=0.007). Similarly, myocardial native T2 values of severe COVID-19 patients were also significantly higher as compared to mild and moderate COVID-19 patients (mild: 44.1+ 1.5 ms vs moderate: 48.5+ 6.1 ms vs severe: 57.4+ 23.8 ms; P=0.002).