Factors Differentiating Multisystem Inflammatory Syndrome in Children (MIS-C) From Severe/Critical COVID-19 Infection in Children.

Gupta, Neha; Talathi, Saurabh

OBJECTIVE To differentiate severe/critical coronavirus disease 2019 (COVID-19) infection from multisystem inflammatory syndrome in children (MIS-C). METHODS Single-center chart review comparing characteristics of children with 'MIS-C' and 'Severe/Critical COVID-19 infection'. Multivariate logistic regression was performed to create predictive models for predicting MIS-C. Results Of 68 patients, 28 (41.2%) had MIS-C while 40 (58.8%) had severe/critical COVID-19 infection. MIS-C patients had a higher prevalence of fever, mucocutaneous, cardiac and gastrointestinal involvement and a lower prevalence of respiratory symptoms (P<0.05). Significantly lower hemoglobin, platelet count, serum electrolytes, and significantly elevated inflammatory and coagulation markers were observed in MIS-C cohort. Upon multivariate logistic regression, the best model included C-reactive protein (CRP), platelet count, gastrointestinal and mucocutaneus involvement and absence of respiratory involvement (performance of 0.94). Using sensitivity analysis, CRP>40mg/L with either platelet count<150x103/mm3 or mucocutaneous involvement had specificity of 97.5% to diagnose MIS-C. CONCLUSION Elevated CRP, thrombocytopenia and mucocutaneous involvement at presentation are helpful in differentiating MIS-C from severe COVID-19.