Predicting prognosis in patients with first-episode psychosis using auditory P300: A 1-year follow-up study.

OBJECTIVE

To clarify the role of auditory P300 in predicting prognosis in patients with first-episode psychosis (FEP) during a 1-year follow-up.

METHODS

Auditory P300 of 24 patients with FEP and 24 matched healthy control (HC) participants were measured at baseline. The clinical status of the FEP patients was assessed at baseline and reassessed after 1 year. P300 amplitudes and latencies among the groups were analyzed using repeated measures analysis of variance. Multiple regression analysis was conducted to assess the predictive value of P300 in patients with FEP during the 1-year follow-up.

RESULTS

Auditory P300 amplitudes were significantly smaller in FEP patients than HCs. Higher baseline P300 amplitudes at CPz significantly predicted better improvements in the Positive and Negative Syndrome Scale total, positive, and general scores, as well as in the Global Assessment of Functioning and Brief Psychiatric Rating Scale.

CONCLUSIONS

P300 may predict improvements in symptoms, functional status, and overall psychiatric status in patients with FEP.

SIGNIFICANCE: We first show that P300 amplitude at baseline predicts symptomatic and functional improvements after 1 year of treatment in patients with FEP. This finding may aid in effective interventions from the beginning of a psychotic episode to improve subsequent outcomes in clinical practice.