Cyclic vomiting syndrome, a common language? A 20-year bibliometric study

Cyclic vomiting syndrome (CVS) is recognized as an episodic syndrome associated with migraine in the last version of the International Classification of Headache Disorders (ICHD-3). It manifests as stereotypical episodes of intense nausea and vomiting, occurring preferentially in childhood. Over the last 2 decades, the knowledge of this disorder has increased. The diagnostic criteria have been modified, through the evolution of several successive classifications. Actually, two classifications are prominent in the literature: the ICHD-3 and the Rome IV classification. The predictable periodicity of episodes is only recognized in the ICHD-3.

We aimed to analyze the evolution of CVS literature in the last 2 decades, with a focus on CVS criteria used in these papers.

We conducted a bibliometric study. We searched in the Web of Science database all papers in English literature with the term CVS in the abstract or title, in the category "article" or "review", published from 2001 to 2020. We searched within the paper which classification was used or mentioned.

In total, 213 papers were analyzed. 116 papers exclusively concerned childhood and adolescence CVS, or were written by pediatric practitioners. For most of the papers, the corresponding author was specialized in the field of gastroenterology. The Rome III classification was the main classification used or mentioned. The ICHD-3 and its beta version were mostly used or mentioned by the authors affiliated to the neurologic field.

This study shows the growth in the number of publications on CVS. It highlights the lack of reference to the ICHD, in particular by practitioners in the field of gastroduodenal disorders. This should encourage the achievement of a common classification with the different scientific societies.