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Funding Acknowledgements Type of funding sources: None. Introduction Coronavirus disease 2019 (COVID-19) infection can have multisystem involvements. The inflammation sequelae can cause myocarditis. The COVID-19 pandemic has impacted Ireland significantly. Understanding of myocardial involvement in COVID-19 is not fully elucidated but has been reported. The Centre for Cardiovascular Magnetic Resonance, Blackrock Clinic in Ireland is a high volume CMR centre with approximately 4500 cases per year and accepting referral from all hospital in Ireland. These analyses are to describe the CMR findings in COVID-19 positive and probable cases attending the centre. Methods Consecutive 65 referrals with mention of "COVID-19" from March 2020 to December 2020 was assessed. 56 cases were included in this analysis. Cases were categorised as COVID-19 positive cases or probable (viral illness like symptoms) cases. The demography and CMR parameters were collected. Serial imaging of selected cases was included. Descriptive analyses methods were applied. Results In the period of 10 months, there was 49 COVID-19 positive cases (65.3% male; median age 49 [32 : 61] years) and 7 COVID-19 probable cases (42.9% male; median age 39 [37 : 59] years). In the COVID-19 positive cases, 25 had normal CMR, 11 has evidence of myocarditis, 1 with pericarditis, 2 with infarction/ischaemia, 3 with dilated cardiomyopathy, 2 with hypertrophic cardiomyopathy and 5 with other findings. There were 3 COVID-19 positive cases with serial imaging showing resolving myocarditis (100% female; median age 41 [30 : 47] years). 2 professional athletes with COVID-19 positive test showed no evidence of myocarditis. There are no significant differences in the age of male COVID-19 positive versus female group (p= 0.0752). Different demography and CMR parameters and tissue characterisation are described in Table 1 and Table 2. Conclusions The prevalence of myocarditis in this cohort is approximately 1 in 5 (21.4%). Within the COVID-19 positive cases, the prevalence is 22.4%. These observations may reflect selection bias for CMR referral in those with cardiac symptoms or cardiac enzymes leak.

Cardiac magnetic resonance in COVID-19 positive and probable cases: A report from a high volume CMR centre in Ireland