Definition | Causes | Risk Factors | Symptoms | Diagnosis | Treatment | Prevention

Definition

Dementia is a general loss of mental abilities. It can include a loss of ability to think, reason, learn, and understand. To be considered dementia, these mental losses must be severe enough to interfere with day-to-day activities. Dementia must also have:

  • Memory problems
  • Mental loss that is severe enough to cause problems with one or more of the following:
    • Language
    • Visuospatial function
    • Executive function (foresight, planning, anticipation, insight)
    • Praxis (learned motor skills)

Some Areas of the Brain Affected by Dementia

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Causes

Causes of dementia include:

Risk Factors

Risk factors for dementia include:

Symptoms

Symptoms often begin mildly. They often get more severe over time. Symptoms vary according to the cause of the dementia, but often include:

  • Increasing trouble remembering things, such as:
    • How to get to familiar locations
    • What the names of family and friends are
    • Where common objects are usually kept
    • How to do simple math
    • How to do usual tasks, such as cooking, dressing, bathing, etc.
    • How to drive
    • How to pay bills
  • Having difficulty concentrating on tasks
  • Having difficulty completing sentences due to lost/forgotten words (may continue to a complete inability to speak)
  • Forgetting the date, time of day, season
  • Getting lost in familiar surroundings
  • Having mood swings
  • Being withdrawn, losing interest in usual activities
  • Having personality changes
  • Walking in a slow, shuffling way
  • Having poor coordination
  • Losing purposeful movement

Diagnosis

Your doctor may diagnose dementia through:

  • An extensive medical history from you and your family
  • Observing your behavior
  • A physical exam
  • Tests for your nervous system
  • Mental status and psychological tests

There are no blood tests or exams that can diagnose Alzheimer's disease. Certain types of brain imaging such as a SPECT or a PET scan may aid in a diagnosis. Tests to rule out other causes of dementia and other medical conditions that may mimic dementia include:

  • Blood tests—to look for syphilis, vitamin B12, folate, thiamine (B1) thyroid, liver, and kidney function
  • CT scan—a type of x-ray that uses a computer to make pictures of structures inside the head
  • MRI scan—a test that uses magnetic waves to make pictures of structures inside the head
  • PET or SPECT scans—tests that use dyes to measure the activity levels of various areas of the brain (used in some cases)
  • Lumbar puncture—a test of the fluid around the brain and spine to look for infection or bleeding, prion diseases, and potential markers of Alzheimer’s disease and other disorders
  • Electroencephalogram (EEG)—a test that records the brain's activity by measuring electrical signals from the brain

The doctor will also check to see if you have depression. It can often present like dementia.

Treatment

Currently, there are no treatments to cure many types of dementia. Some medication may help to decrease the symptoms of dementia or slow its course.

Two types of medicines that may be used to reduce the symptoms of Alzheimer's disease include:

  • Cholinesterase inhibitors—approved and recommended for mild to moderate Alzheimer's disease (such as donepezil [Aricept], rivastigmine [Exelon], galantamine [Reminyl])
  • N-methyl-D-aspartate (NMDA) receptor antagonist—approved for moderate to severe Alzheimer's disease (such as memantine)

Treatments that are being studied include:

This type of support is critical for people with dementia. Behavioral and environmental support includes:

People with dementia often develop psychiatric symptoms. You may need appropriate treatment, such as:

  • Antidepressants
  • Anxiolytics—to treat anxiety
  • Antipsychotics—to treat severe confusion, paranoia, and/or hallucinations
    • Must be used with caution. Generally not recommended in people with dementia.
    • These medications may cause an increased risk for stroke or death in elderly patients with dementia.
  • Mood stabilizers—to treat dangerous or disruptive behaviors

Caring for a person with dementia is very difficult. Those providing care will need support. The Alzheimer’s Association is an excellent resource for families and caregivers.

Prevention

While the exact cause of dementia is not known, these steps may help to reduce your risk:

  • Eat a healthy diet. This will help you to maintain good levels of vitamin B12 and cholesterol.
  • Exercise regularly. This can also enhance cardiovascular health, which may delay the onset of vascular dementia.
  • Alcohol may have some benefits if you use it in moderation. This means no more than two drinks per day for a man, and one drink per day for a woman. Moderate amounts of alcohol may decrease your risk of dementia. But higher amounts of alcohol can increase your risk of dementia.
  • Avoid drug abuse and practice safe sex. This can reduce the risk of AIDS-related dementia.
  • Engage in mentally stimulating activity. This may also reduce the risk of Alzheimer’s disease.