Alzheimer’s disease is the most common type of dementia; accounts for 60 to 80 percent of cases. Difficulty remembering names and recent events is often an early clinical symptom; later symptoms include impaired judgment, disorientation, confusion, behavior changes and trouble speaking, swallowing and walking. Hallmark abnormalities are deposits of the protein fragment beta-amyloid (plaques) and twisted strands of the protein tau (tangles).
Vascular Dementia is considered to be the second-most-common type of dementia. Impairment is caused by decreased blood flow to parts of the brain, often due to a series of small strokes that block arteries. Symptoms often overlap with those of Alzheimer’s, although memory may not be as seriously affected.
Pick's disease is a relatively rare form of dementia that causes a slow shrinking of brain cells due to excess protein build-up. Patients with Pick’s initially exhibit marked personality and behavioral changes, and then a decline in the ability to speak coherently.
Dementia with Lewy Bodies
Dementia with Lewy bodies is a progressive disease. This means that over time the symptoms will become worse. In general, DLB progresses at about the same rate as Alzheimer's disease, typically over several years.
A person with DLB will usually have some of the symptoms of Alzheimer's and Parkinson's diseases.
They may experience problems with attention and alertness, often have spatial disorientation and experience difficulty with 'executive function', which includes difficulty in planning ahead and co-ordinating mental activities. Although memory is often affected, it is typically less so than in Alzheimer's disease....