Vascular parkinsonism (VP), also known as arteriosclerotic parkinsonism, is a neurodegenerative movement disorder characterized by parkinsonian features resulting from cerebrovascular disease, primarily affecting the basal ganglia and white matter. It accounts for approximately 3-6% of all parkinsonism cases and represents a distinct clinical entity from idiopathic Parkinson's disease.
VP was first described in detail in the early 20th century, with Critchley popularizing the concept of "arteriosclerotic parkinsonism" in 1929. The condition is now recognized as one of the atypical parkinsonian disorders, with distinct clinical features, imaging findings, and treatment responses compared to Parkinson's disease.
- Prevalence: 3-6% of all parkinsonism cases (approximately 0.5-1 per 100,000)
- Age of onset: Typically >65 years
- Sex ratio: Male predominance (1.5-2:1)
- Risk factors: Hypertension, diabetes, hyperlipidemia, smoking, prior stroke/transient ischemic attack
¶ Etiology and Pathophysiology
VP results from ischemic or hemorrhagic lesions affecting multiple brain regions:
| Region |
Lesion Type |
Clinical Impact |
| Basal ganglia (putamen, caudate, globus pallidus) |
Lacunar infarcts, hemorrhage |
Disrupted motor circuitry |
| Subcortical white matter |
White matter hyperintensities |
Impaired cortico-striatal connections |
| Thalamus |
Strategic infarcts |
Sensory and motor integration deficits |
| Brainstem (midbrain, pons) |
Small vessel disease |
Nigrostriatal damage |
| Substantia nigra |
Rarely involved |
Variable dopaminergic loss |
- Direct neuronal damage: Ischemic injury to dopaminergic neurons in the substantia nigra pars compacta
- Striatal disruption: Damage to striatal medium spiny neurons disrupting motor output
- White matter injury: Lesions affecting cortico-striatal-pallidal-thalamic circuits
- Small vessel disease: Chronic hypoperfusion and endothelial dysfunction
- Multi-infarct state: Cumulative effect of multiple small strokes
- Hypertension: Most significant risk factor
- Diabetes mellitus: Contributes to small vessel disease
- Hypercholesterolemia: Atherosclerosis
- Smoking: Endothelial damage
- Atrial fibrillation: Cardioembolic events
- Previous stroke: Direct vascular injury
- Bradykinesia: Prominent, often axial (trunk) > limbs
- Rigidity: Axial (neck and trunk) > limb, "lead-pipe" quality
- Gait difficulty: Early, prominent freezing of gait
- Postural instability: Frequent falls, often within first year
| Feature |
Vascular Parkinsonism |
Parkinson's Disease |
| Onset |
Symmetric |
Often unilateral |
| Tremor |
Minimal/restless |
Classic resting tremor |
| Lower body |
Prominent involvement |
Less prominent |
| Progression |
Stepwise |
Gradual |
| Levodopa response |
Poor to moderate |
Good initially |
| Rigidity distribution |
Axial > limbs |
Limb > axial |
- Lower body parkinsonism: Legs more affected than arms
- Gait freezing: Early and prominent
- Start hesitation: Difficulty initiating walking
- Festination: Short, shuffling steps
- Cortical sensory loss: Impaired position sense
- Pseudobulbar affect: Emotional lability
Cognitive impairment:
- Executive dysfunction prominent
- Vascular dementia common
- Memory deficits
- Psychomotor slowing
Mood disorders:
- Depression (very common)
- Apathy
- Emotional lability
Autonomic dysfunction:
- Orthostatic hypotension
- Urinary incontinence (especially advanced)
- Constipation
- Sexual dysfunction
Other features:
- Dysphagia
- Dysarthria
- Sleep disorders (REM behavior disorder less common than in PD)
Proposed diagnostic criteria for VP:
-
Essential features:
- Parkinsonism (bradykinesia + ≥1 other sign: rigidity, tremor, postural instability)
- Evidence of cerebrovascular disease on neuroimaging
- Relationship between vascular lesions and parkinsonian features
-
Supportive features:
- Lower body parkinsonism
- Symmetric onset
- Poor levodopa response
- Early gait freezing
- Early cognitive impairment
- Presence of vascular risk factors
-
Exclusion criteria:
- History of idiopathic Parkinson's disease before stroke
- Other causes of parkinsonism (drug-induced, normal pressure hydrocephalus)
- Clinical features suggesting alternative diagnosis
MRI Brain:
- White matter hyperintensities (Fazekas scale: grade 2-3)
- Lacunar infarcts in basal ganglia, thalamus, white matter
- Periventricular leukoaraiosis
- Old hemorrhagic lesions
- May show substantia nigra involvement
DaTscan (DaT-SPECT):
- Reduced dopamine transporter uptake in striatum
- Typically more symmetric than in PD
- Helps differentiate from essential tremor
CT Head:
- Periventricular hypodensities
- Basal ganglia calcifications
- Evidence of old infarcts
| Condition |
Key Distinguishing Features |
| Idiopathic Parkinson's Disease |
Unilateral onset, resting tremor, good levodopa response |
| Progressive Supranuclear Palsy |
Vertical gaze palsy, early falls, axial rigidity |
| Multiple System Atrophy |
Autonomic failure, cerebellar signs |
| Normal Pressure Hydrocephalus |
Urinary incontinence, cognitive decline, gait apraxia |
| Drug-Induced Parkinsonism |
Temporal relation to dopamine antagonists |
- Secondary stroke prevention: Antiplatelets, anticoagulation if indicated
- Vascular risk factor control: Blood pressure, glucose, lipids
- Lifestyle modification: Smoking cessation, exercise
Limited efficacy is characteristic of VP:
| Medication |
Response |
Notes |
| Levodopa/Carbidopa |
30-40% |
Often requires high doses; response incomplete |
| Dopamine agonists |
Variable |
May help some patients |
| MAO-B inhibitors |
Limited |
Selegiline, rasagiline |
| Amantadine |
May help |
May reduce freezing |
| Anticholinergics |
Not recommended |
Cognitive side effects |
- Cognitive dysfunction: Acetylcholinesterase inhibitors (cautiously)
- Depression: SSRIs, SNRIs
- Orthostatic hypotension: Hydration, compression stockings, fludrocortisone
- Urinary incontinence: Anticholinergic medications, bladder training
- Falls: Physical therapy, balance training, home safety evaluation
Physical Therapy:
- Gait training
- Balance exercises
- Fall prevention
- Aquatic therapy
Occupational Therapy:
- Home safety assessment
- Assistive device training
- Energy conservation techniques
Speech Therapy:
- Dysarthria management
- Swallowing evaluation
- Communication strategies
- Progression: Stepwise rather than gradual, tied to new vascular events
- Functional decline: Often rapid following strokes
- Median survival: 5-9 years from diagnosis
- Cause of death: Stroke recurrence, pneumonia, falls
Poor prognosis:
- Extensive white matter disease
- Multiple lacunar infarcts
- Early falls
- Poor levodopa response
- Rapid cognitive decline
- Recurrent strokes
Relatively better prognosis:
- Fewer vascular risk factors
- Controlled blood pressure
- Good rehabilitation
- Limited lesion burden
- Vascular protection: Endothelial stabilizers
- Tissue plasminogen activator: Acute treatment considerations
- Neurogenesis: Stem cell approaches (experimental)
- Tau-focused treatments: Given overlap with tauopathies
- Neurofilament light chain: Disease burden marker
- Advanced MRI: Diffusion tensor imaging for white matter integrity
- PET imaging: Tau and amyloid imaging
- Focus on disease modification
- Neuroprotective strategies
- Targeted vascular therapies