Schizophrenia-like psychosis following traumatic brain injury: a chart-based descriptive and case-control study.
BACKGROUND
Head injury has been reported to increase the likelihood of the development of schizophrenia-like psychosis (SLP), but its features and risk factors have been insufficiently investigated.


METHODS
Between 1987 and 1997, we examined 45 referred patients with SLP following brain trauma. These subjects were matched with 45 head-injured subjects without SLP on age (current and at injury) and gender, and their case records reviewed systematically. The groups were compared and logistic regression analyses performed.


RESULTS
The psychoses had a mean age of onset of 26.3 years, a mean latency of 54.7 months after head injury, usually a gradual onset and a subacute or chronic course. Prodromal symptoms were common and depression often present at onset. Paranoid delusions and auditory hallucinations were the predominant features, with formal thought disorder, catatonic features and negative symptoms being uncommon. The SLP group had more widespread brain damage on neuroimaging, especially in the left temporal and right parietal regions, and were more impaired cognitively. Fewer (non-significantly) SLP subjects had epilepsy which was more likely to be well-controlled in this group. On regression analysis, a positive family history of psychosis and duration of loss of consciousness were the best predictors of SLP.


CONCLUSIONS
Head injury-related psychosis is usually paranoid-hallucinatory and subacute or chronic in its presentation. A genetic predisposition to schizophrenia and severity of injury with significant brain damage and cognitive impairment may be vulnerability factors.
School of Psychiatry, University of New South Wales and Neuropsychiatric Institute, Prince of Wales Hospital, Randwick, Australia.
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Sachdev
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JS
Smith
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Cathcart
D000293:Adolescent; D000328:Adult; D001930:Brain Injuries / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D016022:Case-Control Studies; D003072:Cognition Disorders / Q000175:diagnosis / Q000209:etiology; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006212:Hallucinations / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D010259:Paranoid Disorders / Q000175:diagnosis / Q000209:etiology; D010296:Parietal Lobe / Q000503:physiopathology; D011618:Psychotic Disorders / Q000175:diagnosis* / Q000209:etiology*; D012044:Regression Analysis; D012307:Risk Factors; D012559:Schizophrenia / Q000209:etiology*; D013702:Temporal Lobe / Q000503:physiopathology