Population-based study of multisystem inflammatory syndrome associated with COVID-19 found that 36% of children had persistent symptoms.
Robin KahnStefan BergLillemor BerntsonElisabet BertholdPetter BrodinFredrik BäckströmMichele CompagnoAnders FasthJenny Lingman FrammeAnnaCarin HorneJosefin HättingPetra KrólAntti J KukkaMaria MossbergBengt MånssonCharlotta NordenhällSelma Idring NordströmFatine Khammari NyströmKarin PalmbladReza RastiAndré RudolphKarin RydenmanErik SundbergEva Säve-SöderberghMaria AltmanPublished in: Acta paediatrica (Oslo, Norway : 1992) (2021)
More than a third (36%) of the patients had persistent symptoms 8 weeks after MIS-C, and 5% had abnormal echocardiograms. Older age and higher levels of initial care appeared to be risk factors. Structured follow-up visits are important after MIS-C.