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Impacts of duration of untreated psychosis on cognition and negative symptoms in first-episode schizophrenia: a 3-year prospective follow-up study

Published online by Cambridge University Press:  07 December 2012

W. C. Chang ,
C. L. M. Hui ,
J. Y. M. Tang ,
G. H. Y. Wong ,
S. K. W. Chan ,
E. H. M. Lee  and
E. Y. H. Chen
W. C. Chang*
Affiliation:
Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong
C. L. M. Hui
Affiliation:
Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong
J. Y. M. Tang
Affiliation:
Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong
G. H. Y. Wong
Affiliation:
Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong
S. K. W. Chan
Affiliation:
Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong
E. H. M. Lee
Affiliation:
Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong
E. Y. H. Chen
Affiliation:
Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong
*
*Address for correspondence: W. C. Chang, Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong. (Email: changwc@hku.hk)
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Abstract

Background

Cognitive impairment is a core feature of schizophrenia. Its relationship with duration of untreated psychosis (DUP), a potentially malleable prognostic factor, has been less studied, with inconsistent findings being observed in the literature. Previous research investigating such a relationship was mostly cross-sectional and none of those prospective studies had a follow-up duration beyond 2 years.

Method

A total of 93 Hong Kong Chinese aged 18 to 55 years presenting with first-episode schizophrenia-spectrum disorder were studied. DUP and pre-morbid adjustment were measured using a structured interview incorporating multiple sources of information. Psychopathological evaluation was administered at intake, after clinical stabilization of the first psychotic episode, and at 12, 24 and 36 months. Cognitive functions were measured at clinical stabilization, and at 12, 24 and 36 months.

Results

DUP exerted differential effects on various cognitive domains, with memory deficits being the most related to DUP even when potential confounders including pre-morbid adjustment and sex were adjusted. Prolonged DUP was associated with more severe impairment in visual memory at clinical stabilization and verbal memory at 24 and 36 months. Further, patients with a long DUP were found to have worse outcomes on negative symptoms at 36 months. The effects of DUP on verbal memory remained significant even when negative symptoms were taken into consideration.

Conclusions

Our findings provided further supportive evidence that delayed treatment to first-episode psychosis is associated with poorer cognitive and clinical outcomes. In addition, DUP may specifically affect memory function and its adverse impact on verbal memory may only become evident at a later stage of the recovery process.

Keywords

Cognitive impairmentduration of untreated psychosis (DUP)first-episode schizophrenianegative symptomsprospective follow-up

Information

Type
Original Articles
Information
Psychological Medicine , Volume 43 , Issue 9 , September 2013 , pp. 1883 - 1893
Copyright
Copyright © Cambridge University Press 2012 

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