Clinical features and long-term outcomes in pediatric cyclic vomiting syndrome: A 9-year experience at three tertiary academic centers

Background: Pediatric cyclic vomiting syndrome (CVS) is a little-known clinical condition, frequently diagnosed with delay. This study aims to describe the clinical presentation and management and to define possible predictive factors of the disease outcome. Methods: In this retrospective study, all children who were diagnosed with CVS during the period 2010-2019 in three tertiary academic centers were included. The association between clinical variables and outcomes was investigated. Key results: Fifty-seven children were included (male/female ratio 1.3:1; mean age at diagnosis 8.2 years). At the time of diagnosis, 63% of children had at least one episode every month. One or more prodromes were reported by 75% of patients. Family history of migraine was reported for 47% of children. Nearly, all of the children were started on prophylactic treatment. The median follow-up period was 29 months ± 15. Overall, 56% of children had resolution of vomiting. Twenty-six percent of children developed migraine. There were no differences in gender, age at onset, duration of follow-up, severity, medication, family history, or trigger factors between children who underwent resolution of vomiting and those who did not, or between children who suffered from migraine or not at follow-up. Four types of disease outcome were recognized, that is, resolution of vomiting with or without associated symptoms; persistence of vomiting with or without associated symptoms. Conclusions and inferences: Cyclic vomiting syndrome clinical presentation has inter-individual variability. Most children recover at follow-up, but often develop further somatic symptoms. In this study, no clinical variable clearly predicted the evolution of the syndrome toward one or the other outcome.