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Higuchi S
National Hospital Organization Kurihama Medical and Addiction Center, Yokosuka, Japan

The Internet has revolutionized the world since its inception in the early 1960s. Since then the medium has experienced exponential growth, facilitated by technological innovations in both Internet services and Internet enabled electronic devices, particularly over the last 15 years. With the increasing ubiquity of the Internet has come attendant concerns about excessive online usage and its consequences for health and social functioning. According to a recent review, prevalence of a condition called Internet use disorder (IUD), ranged from 0.8% in Italy to 26.7% in Hong Kong. Despite this magnitude of problems, globally accepted diagnostic criteria or guidelines for IUD have not been established. Recently, the American Psychiatric Association published an updated version of the DSM and included the diagnostic criteria for Internet gaming disorder (IGD) in Section III, as a condition requiring further research. ICD has been used worldwide and the development of ICD-11 is currently in progress. However, the beta draft version of ICD-11 does not include IUD or IGD as a disorder. Consequently, WHO convened meetings of experts in the fields of IUD and behavioural addiction in 2014 and 2015, in Tokyo and Seoul, respectively. As a result, a draft clinical description and diagnostic guidelines for gaming disorder (GD), including predominantly online and offline options were developed, based on a careful review of current evidence.
My presentation will start by introducing diagnostic criteria and guidelines for IUD that have been published, including those for IGD. It will also present the results of an open clinical trial of the draft diagnostic guidelines for GD using patients with IUD that took place at our center’s specialized outpatient clinic. These will provide some insight into the reliability and clinical utility of the guidelines, and will facilitate discussion of the draft.