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

Background: Acute and Transient Psychotic Disorder (ATPD) is a psychotic disorder of brief duration with acute onset and uncertain diagnostic stability.

Aim: To study the diagnostic stability of ATPD during the index episode.

Method: 140 patients diagnosed with ATPD as per ICD-10, attending a tertiary care hospital in North India were evaluated at follow ups.

Results: Other 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.

Conclusion: The 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.