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  • Title: Long-term outcome of quetiapine use for psychosis among Parkinsonian patients.
    Author: Fernandez HH, Trieschmann ME, Burke MA, Jacques C, Friedman JH.
    Journal: Mov Disord; 2003 May; 18(5):510-4. PubMed ID: 12722164.
    Abstract:
    To evaluate the long-term efficacy and tolerability of quetiapine for psychosis among parkinsonian patients, a retrospective analysis of all parkinsonian patients taking quetiapine for psychosis in a single movement disorders center was carried out. Demographic data, including type and severity of psychosis, presence of dementia, treatment response, before and after Unified Parkinson's Disease Rating Scale (UPDRS)-motor scores and Hoehn and Yahr (H&Y) scale were obtained. One hundred six parkinsonian patients with a mean age of 76.6 years were on an average levodopa (L-dopa) dose of 415 mg/d. Seventy-eight of 106 (74%) remained on quetiapine for a mean duration of 15 months at an average dose of 60 mg per day. Eighty-seven (82%) patients had partial or complete resolution of their psychosis whereas 19 (18%) patients had no improvement on quetiapine. Motor worsening was noted in 34 (32%) patients but was uncommonly sufficient to warrant quetiapine discontinuation. More quetiapine non-responders were noted to be demented, delusional, and experienced threatening psychosis but only the presence of dementia remained significant on multivariate analysis (OR = 11.6; 95% CI = 1.4-92.9). Also, patients who developed motor worsening while on quetiapine tended to be more demented (P = 0.07).
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