A movement disorder resulting from degeneration and malfunction of the CNS common in old age
Causes
Primary Parkinsonism:
• Cause is unknown
Secondary Parkinsonism:
• Infections, eg. sleeping sickness, syphilis
• Poisoning, eg. manganese, carbon monoxide
• Drugs, eg. chlorpromazine, haloperidol
• Hormone disorders, eg. phaeochromocytoma
• Vascular disorders
• Degeneration of basal ganglia
• Intracranial tumour
• Trauma
Clinical features
• Mainly in males
• Intentional tremor
• Excessive salivation
• Vacant facial expression (mask face)
• Muscle rigidity
• Walking with short quick steps (shuffling gait)
• Urinary incontinence (sometimes occurs)
Differential diagnosis
• Any causes of tremor
• Thyrotoxicosis
• Dementia
Investigations
Good history and clinical examination
Management (adults)
HC4
benzhexol 2-15mg daily in 1-3 divided doses
or benzatropine 1-2mg IM or IV
- repeat if symptoms reappear
Caution
Benzhexol, benzatropine: use lower doses in the elderly as they may otherwise cause confusion as a side-effect
Prevention
• Only for secondary type
• Avoid antecedent causes