Outpatient Pediatric Cardiology Follow-Up of Patients with Multisystem Inflammatory Syndrome in Children (MIS-C): A Single-Institution, Medium-Term Follow-Up Study.

We are continuing to learn about the multisystem inflammatory syndrome in children (MIS-C) associated with SARS-CoV-2 infection. There are many published studies regarding the acute management of MIS-C; however, there is still much to learn regarding the long-term outcomes of patients with MIS-C. In this study, we report the outcomes of patients admitted at our institution with MIS-C and the follow-up practices in Pediatric Cardiology over the last three years. We included patients who were admitted at Lucile Packard Children's Hospital between January 1, 2020 and October 31, 2022, who met the CDC criteria for MIS-C, and were followed in the Pediatric Cardiology Outpatient Clinic at our institution. There were 25 patients who met our inclusion criteria. Eighteen patients (72%) had their initial follow-up visit within 1-2 weeks of discharge and seven patients (28%) had their initial follow-up visit within 4-6 weeks of discharge. Six patients out of the 25 (24%) had decreased left ventricular ejection fraction (LVEF < 50%) during their hospitalization. No patients had left main coronary artery aneurysm (z-score > 2.5), two patients (8%) had proximal right coronary artery aneurysm (z-score > 2.5), and one patient (4%) had left anterior descending coronary artery aneurysm (z-score > 2.5) during hospitalization. Patients who were admitted with the diagnosis of MIS-C showed normalization of left ventricular dysfunction at their initial follow-up visit as early as 2-4 weeks after discharge. In this cohort of MIS-C patients, a 4-6-week window for the first follow-up visit after discharge seems reasonable.