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Multisystem inflammatory syndrome in children: A dysregulated autoimmune disorder following COVID-19
1Department of Pediatrics, National Taiwan University Children's Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.
Insights
Multisystem inflammatory syndrome in children (MIS-C) is an autoimmune illness following COVID-19, affecting multiple organs, primarily the GI and cardiovascular systems. MIS-C shares similarities with Kawasaki disease (KD), suggesting a common immune response trigger.
Area of Science:
- Pediatric rheumatology
- Infectious disease immunology
- Autoimmune disorders
Background:
- Multisystem inflammatory syndrome in children (MIS-C) is a post-COVID-19 condition.
- It affects genetically susceptible individuals, typically aged 6-11 years.
- Commonly involves gastrointestinal, cardiovascular, hematological, and mucocutaneous systems.
Purpose of the Study:
- To describe the clinical characteristics and potential pathogenesis of MIS-C.
- To compare MIS-C with Kawasaki disease (KD).
- To explore shared triggers and immune responses between MIS-C and KD.
Main Methods:
- Review of clinical data and manifestations of MIS-C patients.
- Comparative analysis of MIS-C and KD features.
- Discussion of proposed pathogenic mechanisms involving immune dysregulation.
Main Results:
- MIS-C presents with diverse organ involvement, with GI and cardiovascular systems most affected.
- Mucocutaneous findings and coronary artery abnormalities are noted, complicating differential diagnosis with KD.
- Mortality rate is 1-3%, with management and prognosis similar to KD.
Conclusions:
- MIS-C and KD may share common pathogenic pathways, potentially triggered by infectious agents.
- Both conditions may result from exaggerated humoral immune responses.
- Further research into shared triggers and immune dysregulation is warranted.
Abstract:
Multisystem inflammatory syndrome in children (MIS-C) is a dysregulated autoimmune-mediated illness in genetically susceptible patients following COVID-19 with an interval of 2-6 weeks. The median age of patients with MIS-C is 6-11 years. Most common manifestations are involvement of gastrointestinal tract, cardiovascular system, hematological system, and mucocutaneous system. Respiratory tract, neurological system, musculoskeletal system, and kidney are less frequently affected. Mucocutaneous manifestations and coronary artery abnormalities characteristic for Kawasaki disease (KD) may be observed in a significant proportion of MIS-C patients that may make the differential diagnosis be difficult for some patients, especially in the post-pandemic era. The mortality rate is 1-3%. Management and prognosis of MIS-C are similar to that of KD. MIS-C and KD may share a common pathogenic process. Based on the observation of MIS-C-like illness in uninfected neonates, i.e. multisystem inflammatory syndrome in neonates, both MIS-C and KD may be a consequence of dysregulated, over-exaggerated humoral immune responses triggered by a specific infectious agent.
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