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Impairment of olfactory identification ability in individuals at ultra-high risk for psychosis who later develop

Warrick J Brewer¹, Stephen J Wood, Patrick D McGorry

¹Department of Psychiatry, University of Melbourne, Melbourne, Australia. w.brewer@unimelb.edu.au

The American Journal of Psychiatry

|September 30, 2003

Abstract

Objective:

Previous investigation has revealed stable olfactory identification deficits in neuroleptic-naive patients experiencing a first episode of psychosis, but it is unknown if these deficits predate illness onset.

Method:

The olfactory identification ability of 81 patients at ultra-high risk for psychosis was examined in relation to that of 31 healthy comparison subjects. Twenty-two of the ultra-high-risk patients (27.2%) later became psychotic, and 12 of these were diagnosed with a schizophrenia spectrum disorder.

Results:

There was a significant impairment in olfactory identification ability in the ultra-high-risk group that later developed a schizophrenia spectrum disorder but not in any other group.

Conclusions:

These findings suggest that impairment of olfactory identification is a premorbid marker of transition to schizophrenia, but it is not predictive of psychotic illness more generally.

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