Background/Purpose: Distinguishing Multisystem Inflammatory Syndrome in Children (MIS-C) associated with Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV2) from acute, pyrexial childhood illness can be challenging. We present a case series from two tertiary hospitals and compare the clinical phenotype of MIS-C with mimicking systemic inflammatory disorders.

Methods: Children with MIS-C admitted to two tertiary hospitals in a province between 22 June 2020 and 5 March 2021 were recruited. At one of the two hospitals, children with suspected MIS-C with an ultimate alternate diagnosis (inflammatory controls) were also recruited. Clinical data were collected. Statistics were performed using SPSS V. 27.

Results: During the time period, 70 children had confirmed MIS-C and 27 suspected MIS-C cases had an alternate diagnosis including typhoid, tuberculosis, sepsis and appendicitis among others. Sixty five percent of children with MIS-C had no SARS-CoV2 contact but all had evidence of SARS-CoV2 exposure by antibody (90%) or PCR tests (14%). There was no difference in age, sex or ethnic distribution between children with MIS-C and inflammatory controls (Table 1). The most common presenting features of MIS-C were fever (100%), tachycardia (99%), rash (86%), conjunctivitis (79%), and abdominal pain (60%). Compared to inflammatory controls, the presence of tachycardia, abdominal pain and conjunctivitis resulted in 96%; 93% and 91% respectively increased odds of a diagnosis of MIS-C after controlling for all other presenting features. Compared to inflammatory controls, children with MIS-C had lower platelets, sodium and albumin and higher troponin-T and pro-brain natriuretic peptide (pro-BNP)(Table 1).

The median minimum ejection fraction in MIS-C was lower than inflammatory controls (52% vs 63%, p=0.048). Ninety four percent of MIS-C patients received at least one dose of intravenous immunoglobulin (IVIG), 63% required methylprednisolone and 6% received IL-6 inhibition. Children with MIS-C were more commonly admitted to the intensive care unit (ICU) compared to inflammatory controls (38% vs 12.5%, p=0.013) although there was no difference in mean hospital stay which was 8.2 days in MIS-C. There was no difference in requirement for inotropes (p=0.142) or ventilation (p=0.493). No children died.

Conclusion: Distinguishing MIS-C from acute infectious or inflammatory causes of childhood fever may be challenging. The presence of conjunctivitis, tachycardia or abdominal pain associates with higher odds of MIS-C in this population. Differences in widely available blood tests like sodium, albumin and platelets may be useful to differentiate MIS-C in the acute setting.

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ACR Meeting Abstracts - https://acrabstracts.org/abstract/multisystem-inflammatory-syndrome-in-children-at-two-tertiary-hospitals-in-cape-town-south-africa-clinical-phenotype-and-distinguishing-features-from-similar-acute-inflammatory-conditions/