Longitudinal Outcomes for Multisystem Inflammatory Syndrome in Children.

Area of Science:

• Pediatric critical care medicine
• Infectious diseases
• Immunology

Background:

• Multisystem inflammatory syndrome in children (MIS-C) emerged in spring 2020, linked to SARS-CoV-2.
• The long-term effects of MIS-C on children are not well understood.
• This study investigates longitudinal outcomes of MIS-C patients.

Purpose of the Study:

• To describe the longitudinal outcomes of children diagnosed with MIS-C.
• To assess the resolution of inflammatory and cardiac manifestations.
• To identify any persistent immunological changes post-MIS-C.

Main Methods:

• A cohort of children under 21 admitted with MIS-C in 2020 was followed.
• Follow-up assessments occurred at 1-4 weeks, 1-4 months, and 4-9 months post-discharge.
• Data collected included clinical status, inflammatory markers, and echocardiographic findings.

Main Results:

• Most of the 45 MIS-C patients required intensive care and cardiovascular support.
• Elevated inflammatory markers and significant echocardiographic abnormalities, including coronary issues, were common on admission.
• While most markers normalized by 1-4 weeks, persistent lymphocytosis and elevated double-negative T cells were observed, with most cardiac findings resolving by 1-4 weeks.

Conclusions:

• The majority of critically ill children with MIS-C experienced rapid resolution of inflammatory and cardiac symptoms.
• Longitudinal follow-up revealed a high rate of persistent T-cell alterations.
• Overall, MIS-C outcomes were favorable, with most children recovering well over time.