Alzheimer's
disease
Dementia is a
chronic state of confusion in which the patient
finds it hard to remember, learn, and communicate.
There is a gradual
impairment of memory and association with
previously acquired brain functions.
The most common
cause of dementia occurring in patients over 45
yrs of age is Alzheimer's disease.
There are several
suspected causes of Alzheimer's including chemical
and genetic theories.
Studies have shown
an impairment of various neurotransmitters
including acetyl choline in Alzheimer's patients.
It is also
characterized by the formation of senile plaque
involving the accumulation of beta amyloid, and
abnormal neurofibrillary tangles.
Beta amyloid is
derived from a larger molecule called amyloid
precursor protein (APP). APP is normally present
on the cell surfaces and the cleavage of APP
results in the formation of beta amyloid.
Neurofibrillary
tangles consist of insoluble twisted fibers that
are found inside of the brain's cells. They
primarily consist of a protein called tau, which
forms part of a structure called a microtubule. In
Alzheimer's the tau protein is abnormal and the
microtubule structures collapse.
Recent drugs like inhibitors of cerebral
acetylcholine esterase have been shown to be of
some benefit to Alzheimer's patients
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