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Pathophysiology and Treatment of Psychosis in Parkinson’s Disease

A Review

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Abstract

Psychotic symptoms in Parkinson’s disease (PD) are relatively common and, in addition to creating a disturbance in patients’ daily lives, have consistently been shown to be associated with poor outcome. Our understanding of the pathophysiology of psychosis in PD has expanded dramatically over the past 15 years, from an initial interpretation of symptoms as dopaminergic drug adverse effects to the current view of a complex interplay of extrinsic and disease-related factors.

PD psychosis has unique clinical features, namely that it arises within a context of a clear sensorium and retained insight, there is relative prominence of visual hallucinations and progression occurs over time. PD psychosis tends to emerge later in the disease course, and disease duration represents one risk factor for its development. The use of anti-PD medications (particularly dopamine receptor agonists) has been the most widely identified risk factor for PD psychosis. Other risk factors discussed in the literature include older age, disease severity, sleep disturbance, cognitive impairment, dementia and/or depression.

Recent efforts have aimed to explore the complex pathophysiology of PD psychosis, which is now known to involve an interaction between extrinsic, drug-related and intrinsic, disease-related components. The most important extrinsic factor is use of dopaminergic medication, which plays a prominent role in PD psychosis. Intrinsic factors include visual processing deficits (e.g. lower visual acuity, colour and contrast recognition deficits, ocular pathology and functional brain abnormalities identified amongst hallucinating PD patients); sleep dysregulation (e.g. sleep fragmentation and altered dream phenomena); neurochemical (dopamine, serotonin, acetylcholine, etc.) and structural abnormalities involving site-specific Lewy body deposition; and genetics (e.g. apolipoprotein E ɛ4 allele and tau H1H1 genotype). Preliminary reports have also shown a potential relationship between deep brain stimulation surgery and PD psychosis.

When reduction in anti-PD medications to the lowest tolerated dose does not improve psychosis, further intervention may be warranted. Several atypical antipsychotic agents (i.e. clozapine, olanzapine) have been shown to be efficacious in reducing psychotic symptoms in PD; however, use of clozapine requires cumbersome monitoring and olanzapine leads to motor worsening. Studies of ziprasidone and aripiprazole are limited to open-label trials and case reports and are highly variable; however, it appears that while each may be effective in some patients, both are associated with adverse effects. While quetiapine has not been determined efficacious in two randomized controlled trials, it is a common first-line treatment for PD psychosis because of its tolerability, ease of use and demonstrated utility in numerous open-label reports. Cholinesterase inhibitors currently represent the most promising pharmacological alternative to antipsychotics. Tacrine is rarely tried because of hepatic toxicity, and controlled trials with donepezil have not shown significant reductions in psychotic symptoms, due perhaps to methodological limitations. However, results from an open-label study and a double-blind, placebo-controlled trial involving 188 hallucinating PD patients support the efficacy of rivastigmine. With regard to non-pharmacological interventions, case reports suggest that electroconvulsive therapy has the potential to reduce psychotic symptoms and may be considered in cases involving concurrent depression and/or medication-refractory psychosis. Limited case reports also suggest that specific antidepressants (i.e. clomipramine and citalopram) may improve psychosis in depressed patients. Finally, studies in the schizophrenia literature indicate that psychological approaches are effective in psychosis management but, to date, this strategy has been supported only qualitatively in PD, and further studies are warranted.

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Acknowledgements

No funding has been received for the conduct of this study and/or the preparation of this review.

Hubert Fernandez has, over the past 5 years, been a paid consultant, paid speaker or performed clinical research under contract to Amarin, Allergan, AstraZeneca, Aventis, Boehringer Ingelheim, Boston Life Sciences, Biogen Idec, Cephalon, Eisai, Elan, Forest Laboratories, GlaxoSmithKline, Huntington Study Group, Ipsen, Kyowa, Merck, Merz, Michael J. Fox Foundation, Mylan Bertek, National Parkinson Foundation, Neurotrax, National Institutes of Health/National Institute of Neurological Disorders and Stroke, Novartis, Parkinson Study Group, Society of Progressive Supranuclear Palsy, Solstice, Solvay, Teva, United Biosource Corporation, Valeant and Vernalis, but has no owner interest in any pharmaceutical company. Laura Zahodne has no conflicts of interest that are directly relevant to the content of this review.

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Zahodne, L.B., Fernandez, H.H. Pathophysiology and Treatment of Psychosis in Parkinson’s Disease. Drugs Aging 25, 665–682 (2008). https://doi.org/10.2165/00002512-200825080-00004

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