Persistence of Late Gadolinium Enhancement on Follow-Up CMR Imaging in Children with Acute Myocarditis.

Cardiac magnetic resonance (CMR) imaging is the gold standard non-invasive test for the diagnosis of acute myocarditis. Late gadolinium enhancement (LGE) on CMR imaging signifies myocardial fibrosis or scar but information on long-term follow-up in pediatric patients is limited. The aim of this study is to evaluate the persistence of LGE in follow-up CMR imaging and highlight the need for serially following LGE after acute myocarditis in children. A retrospective review of the CMR images in pediatric patients less than 18 years of age at Children's Memorial Hermann Hospital was performed from October 31, 2010, to December 31, 2017. The ages of the patients included in the study ranged from 10 to 17 years. Out of 34 subjects, 12 subjects had a follow-up CMR imaging after the initial CMR imaging. Cardiac enzymes and inflammatory markers were elevated in all patients on initial presentation with normalization seen for all patients on follow-up testing. Baseline CMR imaging demonstrated depressed function in 50% of patients (6/12) with recovery of biventricular function seen in all except for one patient. LGE was detected in 10 out of 12 patients on baseline CMR and persisted in all on follow--up CMR imaging. Two patients did not have LGE at baseline CMR and had no evidence of LGE at follow-up CMR. Despite resolution of acute myocardial inflammation, LGE persisted in all of our study subjects. There is neither an agreement on time interval to perform follow-up CMR, nor on duration of follow-up. We recommend large-scale prospective CMR study for long-term follow-up evaluation of children after acute myocarditis.