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ObjectivesTo study (1) epidemiological factors, clinical profile and outcomes of COVID-19 related multisystem inflammatory syndrome in children (MIS-C), (2) clinical profile across age groups, (3) medium-term outcomes and (4) parameters associated with disease severity.DesignHospital-based prospective cohort study.SettingTwo tertiary care centres in Kerala, India.ParticipantsDiagnosed patients of MIS-C using the case definition of Centres for Disease Control and Prevention.Statistical analysisPearson χ2 test or Fisher’s exact test was used to compare the categorical variables and independent sample t-test or Mann-Whitney test was used to compare the continuous variables between the subgroups categorised by the requirement of mechanical ventilation. Bonferroni’s correction was used for multiple comparisons.ResultsWe report 41 patients with MIS-C, mean age was 6.2 (4.0) years, and 33 (80%) were previously healthy. Echocardiogram was abnormal in 23 (56%), and coronary abnormalities were noted in 15 (37%) patients. Immunomodulatory therapy was administered to 39 (95%), steroids and IVIg both were used in 35 (85%) and only steroids in 3 (7%) patients. Intensive care was required in 36 (88%), mechanical ventilation in 8 (20%), inotropic support in 21 (51%), and 2 (5%) patients died. Mechanical ventilation requirement in MIS-C was associated with hyperferritinaemia (p=0.001). Thirty-seven patients completed 3 months follow-up by April 2021, of whom 6 (16%) patients had some residual echocardiographic changes.ConclusionsPatients with MIS-C in our cohort had varied clinical manifestations ranging from fever with mild gastrointestinal and mucocutaneous involvement to fatal multiorgan dysfunction. Immediate and medium-term outcomes remain largely excellent except for the echocardiographic sequelae in a few patients which are also showing a resolving trend. Hyperferritinaemia was associated with the requirement of mechanical ventilation.

This article has been corrected since it published Online First. Reference 5 has been corrected. *22 ankylosing spondylitis, 7 psoriatic arthritis, 5 reactive arthritis. †1 Behcet's disease, 3 granulomatosis with polyangiitis, 2 polyarteritis nodosa, 1 Takayasu's arteritis.‡One each of fibrosing mediastinitis, common variable immunodeficiency (CVID), leprosy, drug reaction with eosinophilia and systemic symptoms, peripheral symmetric gangrene, pyoderma gangrenosum, and eosinophilic fasciitis, 5 each of gout and sarcoidosis.

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