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• W3217590390 abstract "Introduction: Atypical myocarditis, presenting as isolated chest pain, elevated troponin and preserved cardiac output in childhood is rare. Beyond small volume single center case series, limited data are reported on CMR characteristics at initial presentation and follow up. Methods: This is a pediatric multi-center retrospective study. Patients with chest pain and elevated cardiac troponin who underwent an echo and CMR within 30 days of each other were included. Clinical, echo and CMR parameters were collected at presentation and follow up. CMR global longitudinal strain (GLS) was performed with feature tracking technology (TomTec). Cases were divided into CMR myocarditis positive (Myo+) and CMR myocarditis negative (Myo-) based on Lake Louise criteria. Findings were compared to 19 age matched controls. Results: A total of 108 cases were included (88 Myo+ and 20 Myo-). Majority were male (88%) with average age of 15.6 ± 2.1 years. Median troponin was 13 (0.18-260.1 ng/mL), median BNP was 270.8 (12-3949 pg/ml). Abnormal ECG findings were present in 79% at presentation. While CMR LVEF did not differ between cases (56 ± 9%) and controls (60 ± 4%, p 0.06), GLS was significantly worse in cases (-16.2 ± 2.7%) compared to controls (-19.2 ± 2.1%, p <0.001). Unlike LVEF, GLS was significantly worse in Myo+ (-15.7 ± 2.8%) compared to Myo- cases (-18.0 ± 1.3%, p < 0.001). Fifty-four subjects had follow up data with 35 repeat CMRs. Median follow up was 204 (30-944) days. Late gadolinium enhancement (LGE) persisted in 82% of the Myo+ cases. Of the cases with abnormal GLS at presentation, 77% had persistent LGE. At follow up, 14% of cases were on heart failure medications, 33% had abnormal GLS and 39% had abnormal LVEF (<55%). Neither treatment with steroids or IVIG at presentation nor LGE on initial or follow up CMR were associated with the need for heart failure medications or persistent symptoms at follow up. Conclusions: In atypical myocarditis, CMR GLS can help differentiate between Myo+ and Myo- cases. Abnormal CMR GLS at presentation has higher association with persistence of LGE at follow up, irrespective of type of treatment. Future studies are needed to identify other characteristics that predict persistently abnormal findings important to clinical management and prognosis." @default.
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• W3217590390 date "2021-11-16" @default.
• W3217590390 modified "2023-10-06" @default.
• W3217590390 title "Abstract 10733: Cardiac Magnetic Resonance Characteristics Including Feature Tracking in a Multi-Center Pediatric Study of Atypical Myocarditis" @default.
• W3217590390 doi "https://doi.org/10.1161/circ.144.suppl_1.10733" @default.
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