Clinical, laboratory, and echocardiographic characteristics of critical multisystem inflammatory syndrome in children: a retrospective, observational study

Objective: Multisystem inflammatory syndrome in children (MIS-C) is a critical childhood disease that is associated with coronavirus disease (COVID-19). We aimed to describe the clinical, laboratory, and echocardiographic characteristics and outcome of critical MIS-C cases in Egyptian children during the first wave of the COVID-19 pandemic. Design A retrospective, observational study. Setting A single-center tertiary pediatric intensive care unit (PICU).In Ain Shams university hospitals Cairo Egypt Methods Children admitted to the PICU diagnosed with severe MIS-C as per the Centers for Disease Control's definition from June 23, 2020, to August 22, 2020, were included. Results The patient's mean age was 7.45 (interquartile range [IQR], 4.23) years, and the cause of PICU admission was hypotension and shock. All patients had a fever for 4.8 (IQR, 2.5) days before shock developed. Overall, 68% had a gastrointestinal manifestation, and 55.6% had a rash. Thirty-five of 45 patients had >= 4 elevated inflammatory markers. The cardiac troponin I level was elevated in 35 of 45 patients. The most common cardiac condition was valvulitis (tricuspid regurgitation, 29/45; mitral valve regurgitation, 28/45; pulmonary valve regurgitation, 5/45; atrial valve regurgitation, 4/45). Twenty-one patients had an impaired ejection fraction < 50%, and 17 patients had coronary dilatation. Six patients had pericardial effusion, 1 patient had dilated pulmonary arteries, and 6 patients (13.3%) died of their associated comorbidities. The mean PICU length of stay among patients with no associated comorbidities was 7 days. Conclusions Critical cases of MIS-C had a spectrum of different cardiac conditions, with valvulitis being the most common one. The worst outcome occurred in patients with comorbidities and infants.