Characteristics and outcomes of cases of children and adolescents with pediatric inflammatory multisystem syndrome in a tertiary care centre in Mexico City.
Background: pediatric inflammatory multisystem syndrome (PIMS) is a complication of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in children that resembles Kawasaki syndrome and poses children at high risk of cardiorespiratory instability and/or cardiac damage. This study aims to describe the clinical presentation and outcomes of patients with PIMS in Mexico City. Methods: this was an observational study (May 1, 2020, to September 30, 2021) of children with PIMS according to Centers of Disease Control and Prevention case definition criteria, hospitalized in a single tertiary care pediatric center in Mexico City. Demographic characteristics, epidemiological data, medical history, laboratory tests, cardiology evaluations, treatment, and clinical outcomes were analyzed. Results: Seventy-five cases fulfilled case-definition criteria for PIMS (median age 10.9 years, IQR: 5.6-15.6). Fifteen (20%) had a severe underlying disease. Forty-eight cases (64%) were admitted to the intensive care unit, 33 (44%) patients required invasive mechanical ventilation, and 39 (52%) received vasopressor support. Two distinct groups of patients were identified: cluster 1 (n=60) who had rash or gastrointestinal symptoms and cluster 2 (n=15) with predominantly respiratory manifestations. Two cases (2.7%) died, both with severe underlying conditions. Five cases (6.7%) developed coronary aneurysms, all of them from cluster 1. Conclusion: clinical manifestations and outcomes are in general comparable what has been previously reported in international series. In our series, there was a high proportion of patients with severe respiratory involvement and positive RT-PCR SARS-CoV-2 and a low frequency of coronary aneurysms which suggests a possible higher proportion of children with severe acute COVID-19 in our included cases.