Alzheimer’s disease and vascular dementia (sometimes called vascular cognitive impairment) are both types of dementia. They have several symptoms and characteristics that overlap, but there are also some clear differences between the two.
Vascular: Statistics vary widely as to the prevalence of vascular dementia, but it's estimated that between one and four percent of people over the age of 65 develop vascular dementia. That percentage doubles every five to 10 years after age 65.
Alzheimer’s: Alzheimer's disease is by far the most common kind of dementia. There are about 5.4 million Americans with Alzheimer’s disease.
Vascular: Vascular dementia is often caused by an acute, specific event such as a stroke or transient ischemic attack where the blood flow to the brain has been interrupted. It can also develop more gradually over time from very small blockages or slow downs of blood flow.
Alzheimer’s: While there are several ways to decrease the chance of developing Alzheimer’s such as exercise and maintaining an active mind, we’re still not sure what causes Alzheimer’s to develop. There appear to be many components that may contribute to developing Alzheimer disease such as genetics, lifestyle and other environmental factors.
Alzheimer's: Risk factors include age, genetics (heredity) and general health.
Vascular: Cognitive abilities often seem to decline more suddenly related to an event like a stroke or a transient ischemic attack and then remain more stable. These changes are often described as step-like since in between them, brain functioning may hold steady.
Alzheimer’s: While cognition can vary somewhat in Alzheimer’s, the person’s ability to think and use his memory gradually declines over time. There is not usually a sudden change from one day to the next.
Forming and accessing memories is a typical impairment in the early stages of Alzheimer's.
Walking and Physical Movement:
Vascular: Vascular dementia is often accompanied by some physical challenge. For example, if your loved one had a stroke, she may have limited movement on one side of her body. Both the cognitive and physical impairments related to vascular dementia usually develop at the same time since they are often the result of a sudden condition like a stroke.
Alzheimer’s: Often, mental abilities like memory or judgment decline initially, and then as Alzheimer's progresses into the middle stages, physical abilities like balance or walking show some deterioration.
Vascular: Several tests can help assess your loved one's memory, judgment, communication and general cognitive ability. Along with those tests, an MRI can often clearly identify a specific area in the brain where a stroke or a transient ischemic attack affected his brain.
Alzheimer's: Similar cognitive tests are used to evaluate cognition, but Alzheimer's is often diagnosed by ruling other causes out, rather than being able to pinpoint the diagnosis through a brain scan. There's not one clear test to diagnose Alzheimer's at this time, so physicians generally eliminate other reversible causes of confusion such as vitamin B12 deficiency and normal pressure hydrocephalus,, as well as other types of dementia or delirium.
Vascular: Since there is such a variety of causes and different amounts of damage, it's difficult to predict survival time for vascular dementia. Progression of vascular dementia depends on a number of factors including the extent of the damage in the brain.
Alzheimer’s: The median survival time for individuals with Alzheimer’s is 84.6 years old, and the survival rate after the beginning of symptoms is 8.4 years.
Alzheimer's Association. Risk Factors. Accessed July 31, 2012. http://www.alz.org/alzheimers_disease_causes_risk_factors.asp
Alzheimer’s Association. Vascular Dementia. Accessed June 26, 2012. http://www.alz.org/dementia/vascular-dementia-symptoms.asp">http://www.alz.org/dementia/vascular-dementia-symptoms.asp
Clin Interv Aging. 2006 September; 1(3): 229–235. Vascular dementia: prevention and treatment. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2695177/
Geriatrics and Aging. 2007;10(1):36-41. Vascular Dementia and Alzheimer's Disease: Diagnosis and Risk Factors. Accessed July 31, 2012. http://www.medscape.com/viewarticle/555220_1