In Parkinson disease with dementia, which pattern best describes the cognitive progression relative to motor symptoms?

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Multiple Choice

In Parkinson disease with dementia, which pattern best describes the cognitive progression relative to motor symptoms?

In Parkinson disease with dementia, the motor system is affected first and the cognitive changes come later. The typical progression is that motor symptoms such as tremor, rigidity, and bradykinesia appear before noticeable cognitive decline, with the cognitive changes emerging after motor symptoms have already begun. Clinically, a useful rule is that if dementia starts after motor symptoms by about a year or more, it fits the pattern of PD dementia rather than dementia with Lewy bodies, where cognitive symptoms appear early or around the same time as motor symptoms. So the idea that motor symptoms precede cognitive decline by roughly one year best reflects the usual course in PD with dementia. The other options misstate the sequence or the possibility of cognitive involvement, or they overstate its absence or timing.

In Parkinson disease with dementia, the motor system is affected first and the cognitive changes come later. The typical progression is that motor symptoms such as tremor, rigidity, and bradykinesia appear before noticeable cognitive decline, with the cognitive changes emerging after motor symptoms have already begun. Clinically, a useful rule is that if dementia starts after motor symptoms by about a year or more, it fits the pattern of PD dementia rather than dementia with Lewy bodies, where cognitive symptoms appear early or around the same time as motor symptoms. So the idea that motor symptoms precede cognitive decline by roughly one year best reflects the usual course in PD with dementia. The other options misstate the sequence or the possibility of cognitive involvement, or they overstate its absence or timing.

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