Letters

Decline in cognitive function in Parkinson's disease may be due to dementia with Lewy bodies

BMJ 1998; 316 doi: https://doi.org/10.1136/bmj.316.7136.1022 (Published 28 March 1998) Cite this as: BMJ 1998;316:1022
  1. Jan Grace, Clinical research associate,
  2. I G McKeith, Professor of old age psychiatry
  1. Department of Old Age Psychiatry, Newcastle General Hospital, Newcastle upon Tyne NE4 6BE
  2. Institute for the Health of the Elderly, University of Newcastle, Newcastle General Hospital, Newcastle upon Tyne NE4 6BE

    EDITOR—Donnellan et al report on four patients with Parkinson's disease in whom prescription of oxybutynin was associated with worsening cognitive function.1 Cognitive impairment in Parkinson's disease is common. It has been suggested that when a progressive decline in cognitive function in Parkinson's disease is accompanied by visual hallucinations and fluctuating cognition a secondary diagnosis of dementia with Lewy bodies is made.2 Dementia with …

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