Outcome of acute and transient psychotic disorder in an index episode: A study from a tertiary care centre in North India

•Acute and transient psychotic disorder (F23.8) was the most commonly diagnosed subtype ATPD.•Acute and transient psychotic disorder (F23.8) has poor diagnostic stability.•The index acute psychotic episode, may evolve into a mood disorder or schizophrenia.

BackgroundAcute and Transient Psychotic Disorder (ATPD) is a psychotic disorder of brief duration with acute onset and uncertain diagnostic stability.AimTo study the diagnostic stability of ATPD during the index episode.Method140 patients diagnosed with ATPD as per ICD-10, attending a tertiary care hospital in North India were evaluated at follow ups.ResultsOther acute and transient psychotic disorder (ICD10: F23.8) was the most common (69.3%) subtype of ATPD. In 14.28% patients, there was a past episode of ATPD. In our study, 66.3% patient's episodes resolved as ATPD, 32.7% patients converted into either a mood disorder or schizophrenia spectrum disorders.ConclusionThe diagnostic stability of ATPD during the index episode was 66.3% during three months follow up period. Nearly two third of patients with ATPD evolve to either, schizophrenia or mood disorders during the index episode.