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Parkinson's disease is a progressive neurodegenerative disorder characterized by motor symptoms including tremor, rigidity, bradykinesia, and postural instability. The condition results from the death of dopamine-producing neurons in the substantia nigra of the brain. Early diagnosis and appropriate treatment can significantly improve quality of life and slow disease progression.
Parkinson's disease involves the progressive degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to decreased dopamine levels in the striatum. This dopamine deficiency disrupts the normal balance between dopamine and acetylcholine in the basal ganglia circuitry, resulting in impaired motor control. Alpha-synuclein protein aggregates form Lewy bodies within neurons, contributing to cellular dysfunction and death.
Diagnosis relies on clinical presentation of cardinal motor features: resting tremor, muscle rigidity, bradykinesia, and postural instability, typically with asymmetric onset. Non-motor symptoms like anosmia, REM sleep behavior disorder, and constipation may precede motor symptoms by years. Treatment focuses on dopamine replacement therapy with levodopa/carbidopa as the gold standard, along with dopamine agonists, MAO-B inhibitors, and physical therapy to manage symptoms and maintain function.