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Parkinson Disease Dementia (cont.)

Parkinson's Disease Dementia Symptoms

Cognitive impairment in Parkinson's disease may range from a single isolated symptom to severe dementia.

  • The appearance of a single cognitive symptom does not mean that dementia will develop.
  • Cognitive symptoms in Parkinson's disease usually appear years after physical symptoms are noted.
  • Cognitive symptoms early in the disease suggest dementia with Parkinsonian features, a somewhat different condition.

Cognitive symptoms in Parkinson's disease include the following:

  • Loss of decision-making ability
  • Inflexibility in adapting to changes
  • Disorientation in familiar surroundings
  • Problems learning new material
  • Difficulty concentrating
  • Loss of short- and long-term memory
  • Difficulty putting a sequence of events in correct order
  • Problems using complex language and comprehending others' complex language

Persons with Parkinson's disease, with or without dementia, may often respond slowly to questions and requests. They may become dependent, fearful, indecisive, and passive. As the disease progresses, many people with Parkinson's disease may become increasingly dependent on spouses or caregivers.

Major mental disorders are common in Parkinson's disease. Two or more of these may appear together in the same person.

  • Depression: Sadness, tearfulness, lethargy, withdrawal, loss of interest in activities once enjoyed, insomnia or sleeping too much, weight gain or loss
  • Anxiety: Excessive worry or fear that disrupts everyday activities or relationships; physical signs such as restlessness or extreme fatigue, muscle tension, sleeping problems
  • Psychosis: Inability to think realistically; symptoms such as hallucinations, delusions (false beliefs not shared by others), paranoia (suspicious and feeling controlled by others), and problems with thinking clearly; if severe, behavior may be seriously disrupted; if milder, behavior that is bizarre, strange, or suspicious may occur.

The combination of depression, dementia, and Parkinson's disease usually means a faster cognitive decline and more severe disability. Hallucinations, delusions, agitation, and manic states can occur as adverse effects of drug treatment of Parkinson's disease, this might complicate the diagnosis of Parkinson's dementia.

Medically Reviewed by a Doctor on 4/30/2014

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Read What Your Physician is Reading on Medscape

Parkinson Disease Dementia »

Parkinson disease (Parkinson's disease, PD) is a disabling, progressive condition that is predominantly thought of as a movement disorder.

Read More on Medscape Reference »


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