Abstract
This lecture will summarise the achievements and challenges of detection, prognosis, prevention of individuals at Clinical High Risk for Psychosis (CHR-P). CHR-P individuals are typically young (mean [SD] age, 20.6 [3.2] years), more frequently male (58%), and predominantly present with attenuated psychotic symptoms lasting for more than 1 year before their presentation at specialized services. CHR-P individuals accumulate several sociodemographic risk factors compared with control participants.
Substance use, comorbid mental disorders, suicidal ideation, and self-harm are also frequently seen in CHR-P individuals. CHR-P individuals show impairments in work (Cohen d = 0.57) or educational functioning (Cohen d = 0.21), social functioning (Cohen d = 1.25), and quality of life (Cohen d = 1.75). Several neurobiological and neurocognitive alterations have been confirmed. The prognostic accuracy of CHR-P instruments is good, provided they are used in clinical samples. Overall, risk of psychosis is 22% at 3 years, and the risk is the highest in the brief and limited intermittent psychotic symptoms subgroup (38%).
Baseline severity of attenuated psychotic (Cohen d = 0.35) and negative symptoms (Cohen d = 0.39) as well as low functioning (Cohen d = 0.29) are associated with an increased risk of psychosis. Controlling risk enrichment and implementing sequential risk assessments can optimize prognostic accuracy. No robust evidence yet exists to favour any indicated intervention over another for preventing psychosis or ameliorating any other outcome in CHR-P individuals. However, because the uncertainty of this evidence is high, needs-based and psychological interventions should still be offered.