Parkinson’s disease is the most common form of Parkinsonism and the second most common neurodegenerative disorder. It involves a progressive depletion of dopaminergic neurons in the basal ganglia, particularly the substantia nigra. Parkinson disease can be defined as parkinsonism for which no cause can be determined (idiopathic)
PD usually manifests at approximately 60 years of age. The typical clinical picture seen in PD is called Parkinsonism and features the classical cardinal symptom of bradykinesia along with resting tremor and/or rigidity.
Though PD is the main cause, parkinsonism may also result from other factors, e.g. medication (secondary parkinsonism), and as a feature of neurodegenerative diseases ( Atypical parkinsonism)
Types
Cardinal Motor feature
Bradykinesia : slowness of movement with decreased amplitude or speed
Classical pill rolling tremor: Resting tremor that subsides with voluntary movements
Rigidity
Parkinsonian gait – shuffling gait with quickened and short steps
Postural instability
Other motor features
Microphagia
Masked facies
Reduced eye blinking ( hypomimia)
Soft voice (hypophonia)
Dysphagia
Freezing : sudden brief inability to start movement or to continue rhythmic, repeated movements, such as finger tapping, writing or walking
Turning en block : often known as pivot sign
Camptocormia : Abnormal, severe, and involuntary forward flexion of the thoracolumbar spine which becomes manifested during standing and walking and subsides in the recumbent position
Dystonia, Scoliosis, drooling
Re-emergence of primitive reflex like glabellar tap
Non motor features
Anosmia
Constipation
Sensory disturbances like pain
Depression
Sleep disturbances
Cognitive impairment
Sexual dysfunction
Gastro intestinal & Genito urinary disturbances
Differential diagnosis
Secondary parkinsonism
Parkinson plus syndromes
Investigation
Usually a clinical diagnosis is made
Levodopa challenge test : the result is positive if administration of levodopa /apomorphine relieves symptoms
MRI: To rule out other possible causes of parkinsonism ( strokes, tumours)
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