Korean J Schizophr Res.  2017 Apr;20(1):15-22. 10.16946/kjsr.2017.20.1.15.

Predicting Prognosis in Patients with First Episode Psychosis Using Mismatch Negativity : A 1 Year Follow-up Study

Affiliations
  • 1Seoul National University College of Medicine, Seoul, Korea.
  • 2Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea. verte82@snu.ac.kr
  • 3Department of Brain and Cognitive Science-World Class University Program, Seoul National University College of Natural Science, Seoul, Korea.

Abstract


OBJECTIVES
It has been shown that early intervention is crucial for favorable outcome in patients with schizophrenia. However, development of biomarkers for predicting prognosis of psychotic disorder still requires more research. In this study, we aimed to investigate whether baseline mismatch negativity (MMN) predict prognosis in patients with first episode psychosis (FEP).
METHODS
Twenty-four patients with FEP and matched healthy controls (HCs) were examined with MMN at baseline, and their clinical status were re-assessed after 1 year. Repeated-measures analysis of variance was performed to compare baseline MMN between the two groups. Multiple regression analysis was used to identify factors predicting prognosis in FEP patients during the follow-up period.
RESULTS
MMN amplitudes at baseline were significantly reduced in patients with FEP compared to healthy controls. In the multiple regression analysis, baseline MMN amplitude significantly predicted later improvement of performances on digit span and delayed recall of California Verbal Learning Test. However, baseline MMN did not predicted improvement of clinical symptoms.
CONCLUSION
These results indicate that MMN may be a possible predictor of improvement in cognitive functioning in patients with FEP. Future study with larger sample and longer follow-up period would be needed to confirm the findings of the current study.

Keyword

Event related potential; Mismatch negativity; First episode psychosis; Schizophrenia; Cognitive function; Prognosis

MeSH Terms

Biomarkers
California
Cognition
Early Intervention (Education)
Follow-Up Studies*
Humans
Polytetrafluoroethylene
Prognosis*
Psychotic Disorders*
Schizophrenia
Verbal Learning
Biomarkers
Polytetrafluoroethylene

Figure

  • Fig. 1. A : The grand averaged Mismatch negativity waveforms at Fz and FCz electrode sites in patients with FEP and HC. B : Two-dimensional topographic maps of MMN across FEP and HC groups. Color bar with numbers indicates MMN amplitude (μV). FEP : first episode psychosis, HC : healthy controls.

  • Fig. 2. Association between baseline MMN amplitude at FCz electrode site and improvement in performances of neurocognitive function tests. CVLT : California Verbal Learning Test.


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