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due to stroke
carries major morbidity in elderly.The reversal of stroke events inside the brain depend on the time treatment started .The paralytic limbs gain strength by good physiotherapy
and control of hypertension
.Though after 4 years of paralysis the results are not quick and marked , you should try physiotherapy.Regular physiotherapy can bring back the muscle strength and a scope to recover.
So , I advise you to visit Physiotherapist near your area and get regular therapy done.