Systemic Arterial Function after Multisystem Inflammatory Syndrome in Children Associated with COVID-19

Introduction: Multisystem inflammatory syndrome in children (MIS-C) is a new disease entity occurring in the pediatric population two to six weeks after coronavirus exposure due to a systemic arteritis. We investigated post-hospital-discharge arterial function at short- and mid-term intervals using pulse wave velocity. We assessed associations between arterial function, left ventricular diastolic and systolic function and left ventricular mass. Materials and methods: Retrospective data collection was carried out on 28 patients with MIS-C with at least two outpatient pediatric cardiology clinic visits post hospital admission. The patients underwent assessment of systemic arterial function and cardiac function. Data included pulse wave velocity between carotid and femoral arteries and echocardiographic assessment of left ventricular systolic function (shortening and ejection fraction, longitudinal strain), diastolic function and left ventricular mass. Results: Pulse wave velocity significantly decreased from visit 1 to visit 2 (5.29 ± 1.34 m/s vs. 4.51 ± 0.91 m/s, p = 0.009). Left ventricular mass significantly decreased from visit 1 to visit 2 (42 ± 9 g/m2.7 vs. 38 ± 7 g/m2.7, p = 0.02). There was a significant negative correlation between the pulse wave velocity and E/A mitral inflow (−0.41, p < 0.05). Conclusions: Children have elevated pulse wave velocity and left ventricular mass in the short-term relative to mid-term values after hospital discharge. These results suggest that MIS-C is associated with transient systemic arterial dysfunction, which, in turn, may play a role in cardiac changes.