3. PARKINSON'S DISEASE
Parkinsan's disease (PD) is typically considered a
chronic, progressive neurodegenerative
movement disorder. Lake of Dopamine is
responsible for the Parkinson's disease.
4.
5. Dopamine
Dopamine is an amine synthesized by removing a
carboxyl group from a molecule of its precursor
chemical L-DOPA,which is synthesized in the brain
and kidneys.
7. Tremor
Rest tremor, easily recognized, is unilateral,
occurs at frequencies between 4 & 6 Hz, is almost
always prominent in distal extremities, and
disappears with action and during sleep.
Supination-pronation (pillrolling) tremor spread
from one hand to the other. Rest tremor can also
involve the lips, chin, jaw and legs. The neck,
head, or voice are usually uninvolved.
8. Rigidity
Rigidity is increased resistance, usually
demonstrated by the cogwheel phenomenon
circular jerking rigidity in flexion and extension in
a background of tremor, which continues
throughout an entire range of movement. It can
be painful, and painful shoulder is one of PD's
most frequent initial manifestations. Rigidity of
the neck and trunk may cause postural
deformities, generally late in the disease.
9. Bradykinesia
Bradykinesia, or slow movement, is PD's most
characteristics clinical feature. Initially, it creates
difficulty with ordinary activities and slow
movement and reaction times. Eventually,
patients become frozen and cannot gesture, drool
because of impaired swallowing, loose facial
expression. Bradykinesia appears to be related to
degree of dopamine deficiency.
10. Postural Instability
Postural instability occurs as the patient loses
postural reflexes, often at the late stage of PD'S.
Postural instability frequently causes falls, many
of which lead to hip fractures.
13. Pathophysiology
Decreased stimulation of the motor cortex by the
basal ganglia, usually due to the madequate
production and action of dopamine.
The specific region affected seems to be the pars
compact in the substantia nigra where there is a
marked loss in dopaminergic cells.
High presence of lewy bodies in dopaminergic
cells.
