Long-term Health Outcomes After Hospital Discharge Among Children Hospitalized for MIS-C or COVID-19, September 29, 2021, to June 21, 2022

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BACKGROUND: The long-term effects of children hospitalized with multisystem inflammatory syndrome in children (MIS-C) or acute COVID-19 are not well known. Our objective was to determine long-term outcomes. METHODS: Children hospitalized with MIS-C or COVID-19 at 3 US hospitals from March 2020, through February 2021 were followed to assess health through 2 years post-hospitalization using medical records and patient surveys. RESULTS: Medical record abstraction was performed for 183 patients hospitalized with MIS-C, 53 of whom participated in surveys, and 97 patients hospitalized with COVID-19, 35 of whom participated in surveys. Patients with MIS-C were younger (median, 9 vs. 14 years of age for COVID-19 patients; P = 0.004), more frequently male (62% vs. 39%; P < 0.001) and had more cardiac (14% vs. 2%; P = 0.001) and neurologic sequelae (8% vs. 1%; P = 0.023). Children with COVID-19 more often had other comorbidities (59% vs. 19%; P < 0.001). Full mental recovery at the time of survey 2 (median, 16 months post-hospitalization for patients with MIS-C and 20 months for patients with COVID-19) was 85% and 88%, respectively; full physical recovery was 87% and 81%, respectively; and nearly all had resumption of normal activities. Patients with MIS-C reported more frequent headache at 1 month (45% vs. 20%; P = 0.037). Patients with COVID-19 were more likely to report cough at 1 month (37% vs. 17%; P = 0.045). Fatigue persisted >1 year in 15%-20% of patients in both groups. CONCLUSIONS: Approximately 20% of children with MIS-C and COVID-19 continued to have symptoms including fatigue and headache >1 year after hospital discharge. The duration of these findings emphasizes the importance of providers following patients until sequelae have resolved.

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