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PurposesToassessthecorrelationbetweentheCMRfindingsatdifferentstagesandtheshort-termoutcomesoffulminant myocarditis(FM)inchildren MethodsCMRexaminationswereperformedineightchildrenwithFMatacute/subacutestageandatchronicstage.Left ventricular(LV)cardiacmorphologyandfunctionandmyocardialtissuecharacterizationattwostageswerecomparedusing pairedT-testandMann-WhitneyUtest.TheclinicaldataandCMRfindingsatacute/subacutestagewerealsoanalyzedtopredict short-termoutcomes. ResultsThemedianageofeightchildrenwas8.5yearsold(range,3to14).TheLVejectionfraction(LVEF)ofFMchildrenwithin 72hoursoftheonsetwas36.8±8.9(%).ThemedianintervalsfromonsettoinitialandthesecondCMRexaminationswere10 days(range,7to20)and55days(range,33to75),respectively.TheCMRfindingsatacute/subacutestageweremostcommon withearlygadoliniumenhancement(EGE,100%),followedbysignalincreasingonT2WIandlategadoliniumenhancement(LGE, 87.5%),increasedseptalthickness(75.0%)andincreasedLVEF(50.0%).AtthechronicstageofFM,onlythreeLGE(37.5%),one signalincreasingonT2WI(12.5%)andoneincreasedLVEF(12.5%)werefound.Statisticallysignificantdifferenceswerefound betweenCMRabnormalitiesatacute/subacutestageandatchronicstageintheseptalthickness,LVEDD,ESV,LVEF,LVmass,T2 ratioandLGEarea(P=0.011,P=0.042,P=0.016,P=0.001,P=0.003,P=0.011,P=0.020).Thechildrenwithfullrecoveryperformed higherincidenceofⅢ°AVB(5casesVS0case)andsmallerLGEarea(104.0±14.5mm2VS138.0±25.2mm2)atacute/subacute stageofFM. ConclusionTheCMRfindingsofFMinchildrenwerecharacteristicandusefulforearlydiagnosis.Fullrecoveryofclinical manifestations,immunologicalfeaturesandCMRfindingscouldbefoundinmostFMchildren.ThepresenceofⅢ°AVBand smallerLGEareaatacute/subacutestagemightindicatebettershort-termoutcomes.