A naturalistic longitudinal study of at-risk mental state with a 2.4 year follow-up at a specialized clinic setting in Japan

Masahiro Katsura, Noriyuki Ohmuro, Chika Obara, Tatsuo Kikuchi, Fumiaki Ito, Tetsuo Miyakoshi, Hiroo Matsuoka, Kazunori Matsumoto

研究成果: Article査読

31 被引用数 (Scopus)

抄録

Objective: The notion of at-risk mental state (ARMS) is valuable for identifying individuals in a putative prodromal state of psychosis and for reducing conversion risk by pharmacological and psychological interventions. However, further systematic study is required because 1) diagnostic reliability in various clinical settings is not yet established; 2) predictive ability is insufficient; 3) optimal interventions in diversified populations are elusive; and 4) little evidence from non-Western regions exists. Methods: A naturalistic longitudinal study was conducted at a specialized clinic for early psychosis at a university hospital in Sendai, Japan. Individuals with ARMS (n. =. 106) were recruited and followed up with case-by-case treatment. Results: Two-thirds of the participants were psychiatrist referrals, and 83 were followed up for at-least 1. year (mean follow-up. =. 2.4. years). Fourteen developed psychosis and the estimated (by Kaplan-Meier) cumulative transition rate was 11.1% at 12, 15.4% at 24, and 17.5% at 30. months. At the end-point, about 30% of the 83 followed-up participants including 11 converters received antipsychotic medication. Compared to non-converters, converters showed more severe attenuated psychotic symptoms, including ego-boundary disturbance, formal thought disorder, and emotional disturbance. Conclusions: The present study replicated previous major Western longitudinal studies, in terms of clinical characteristics, psychosis transition rate, and antipsychotic prescription rate. Our results emphasize the importance of phenomenological assessment of ARMS and intensive care in a clinical setting.

本文言語English
ページ(範囲)32-38
ページ数7
ジャーナルSchizophrenia Research
158
1-3
DOI
出版ステータスPublished - 2014

ASJC Scopus subject areas

  • 精神医学および精神衛生
  • 生物学的精神医学

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