ABSTRACT
PURPOSE: The aim of the current study was to depict a comprehensive geographical picture of the existing literature on psychogenic nonepileptic seizures (PNES) and to highlight the needs for future works. METHODS: We searched the electronic database PubMed on June 8, 2019 for articles that included any of the related key words to analyze all the relevant literature. We applied the advance search; field was adjusted to the title and dates were adjusted to 01/01/2000 until 06/08/2019. We selected the relevant articles. Location of the study was determined according to the affiliation(s) of the authors. RESULTS: 1017 papers were included. Interest in research and publication on PNES has risen over the past two decades. Six hundred and nine full length research original papers and 199 review articles were published on PubMed from 2000 until 2019. Continent-wise, most articles were from North America and Europe (41.1% of the whole publications from Europe and 40.8% from North America; 833 papers totally), followed by Asia (92 papers), Oceania (36 papers) and South America (31 publications), while only 0.9% of the papers (9 papers) were from Africa. CONCLUSION: A global campaign is necessary to inform and educate the world on the issue of PNES and its significance. While PNES merit further epidemiological investigations, there is a significant disparity with regard to the location of the studies. There is a huge need to invest more on studies on various aspects of PNES in many places in the world, including African nations, India, and China.
