Neurology · PANCE / PANRE

Vascular Dementia

Cognitive impairment due to cerebrovascular disease; second most common dementia cause.

Also known as: VaD, vascular cognitive impairment, multi-infarct dementia, VCI

Overview

Cognitive impairment caused by cerebrovascular disease — large-vessel infarcts, small-vessel ischemia (lacunes, leukoaraiosis), strategic single infarcts, or hypoperfusion. Vascular cognitive impairment (VCI) is the broader continuum from mild cognitive impairment to dementia.

Epidemiology

Second most common cause of dementia after Alzheimer disease; accounts for ~15-20% as a pure form, but coexists with AD in many older patients ('mixed dementia'). Prevalence increases with age and cardiovascular risk factors.

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Risk factors

Hypertension (especially midlife)
Diabetes mellitus
Dyslipidemia
Smoking
Atrial fibrillation
History of stroke or TIA
Carotid stenosis, peripheral vascular disease
Chronic kidney disease
Obstructive sleep apnea
Sedentary lifestyle, obesity

Pathophysiology

Diverse mechanisms: (1) large-vessel cortical infarcts producing cognitive deficits; (2) small-vessel disease causing lacunar infarcts in basal ganglia/thalamus/internal capsule and confluent white matter ischemia disrupting frontosubcortical circuits; (3) a single strategically located infarct (e.g., thalamus, angular gyrus, anterior cerebral artery territory); (4) hypoperfusion or watershed injury; (5) cerebral amyloid angiopathy with microbleeds. Frontal-subcortical disconnection causes executive dysfunction and slowed processing characteristic of subcortical VaD.

Clinical presentation

Symptoms

Stepwise decline temporally related to vascular events (classic but not universal); subcortical VaD may progress gradually
Executive dysfunction (planning, multitasking, attention) and slowed processing — prominent early features
Memory impairment milder than in AD initially, with better cueing benefit
Mood symptoms: depression, apathy, emotional lability ('pseudobulbar affect')
Gait disturbance early (often before significant cognitive decline) — small-stepped, magnetic, frontal gait
Urinary urgency/incontinence
Focal neurologic deficits depending on infarct location: hemiparesis, dysarthria, hemianopia, sensory loss

Signs / physical exam

Focal corticospinal findings: pyramidal weakness, hyperreflexia, Babinski
Pseudobulbar palsy (dysarthria, dysphagia, emotional lability)
Subcortical signs: bradykinesia, gait apraxia
Carotid bruits, irregular pulse (AF), vascular risk-factor stigmata
Hachinski Ischemic Score ≥7 suggests vascular over AD etiology

Classic findings

Stepwise decline + focal neurologic findings + extensive white matter disease/lacunes on MRI.

Differential diagnosis

Alzheimer disease — Insidious onset, predominant memory impairment, medial temporal atrophy; AD and VaD frequently coexist (mixed dementia)
Lewy body dementia — Fluctuating cognition, visual hallucinations, parkinsonism, REM sleep behavior disorder
Normal pressure hydrocephalus — Gait apraxia (magnetic), urinary incontinence, cognitive impairment; ventriculomegaly out of proportion to atrophy
Frontotemporal dementia — Behavioral/language onset, younger age, focal frontal/temporal atrophy
CADASIL — Young-to-middle-age onset, family history (NOTCH3 mutation), migraine with aura, recurrent subcortical strokes, anterior temporal pole white matter changes
Recurrent strokes from cardioembolic source — Atrial fibrillation, valvular disease, PFO; consider anticoagulation
Vasculitis (CNS or systemic) — Subacute progression, headache, multi-territory infarcts, abnormal ESR/CRP, beading on angiography

Diagnostic workup

Diagnostic criteria

NINDS-AIREN or VASCOG criteria: cognitive decline + cerebrovascular disease on imaging + temporal/causal relationship. Probable VaD when both are clear; possible when imaging-clinical relationship less certain.

Labs

Stroke risk factor workup: lipid panel, A1c, fasting glucose, BMP, TSH, B12
Hypercoagulable workup only if young or recurrent unexplained stroke
ESR, CRP if vasculitis suspected

Imaging

MRI brain (preferred): cortical/subcortical infarcts, lacunes, confluent white matter hyperintensities (leukoaraiosis), microbleeds (susceptibility-weighted imaging) suggesting cerebral amyloid angiopathy
CT acceptable if MRI contraindicated
Carotid duplex, echocardiogram (TTE/TEE) if embolic source suspected
Holter or extended cardiac monitoring for occult atrial fibrillation

Diagnostic algorithm

Feature	Alzheimer Disease	Vascular Dementia
Onset	Insidious	Often abrupt or stepwise
Course	Gradual, continuous decline	Stepwise; may plateau
Earliest deficit	Episodic memory (storage)	Executive function, processing speed
Focal neuro findings	Absent early	Present (hemiparesis, dysarthria)
Gait disturbance	Late	Early (frontal/apractic)
Imaging	Medial temporal atrophy	Infarcts, lacunes, white matter disease
Risk factors	Age, APOE4, family history	HTN, DM, AFib, smoking
Disease-modifying therapy	Anti-amyloid mAbs (early AD)	Vascular risk-factor control

Comparing Alzheimer disease and vascular dementia.

Treatment

First-line

Aggressive cardiovascular risk-factor control (the only intervention that slows progression):
Antihypertensive therapy targeting individualized BP goal (typically <130/80 mmHg if tolerated)
Statin therapy (high-intensity for established atherosclerotic disease)
Antiplatelet (aspirin 81 mg, clopidogrel) for non-cardioembolic; anticoagulation for AF (DOAC preferred — apixaban, rivaroxaban, edoxaban, dabigatran)
Glycemic control: target A1c per patient frailty (<7-8%)
Smoking cessation, weight loss, exercise, Mediterranean/DASH diet
Treat OSA with CPAP

Second-line / adjunct

Symptomatic cognitive therapy: cholinesterase inhibitors (donepezil, galantamine, rivastigmine) and memantine show modest benefit, especially in mixed AD/VaD; not FDA-approved for pure VaD but commonly used
Depression: SSRIs (sertraline, escitalopram, citalopram)
Pseudobulbar affect: dextromethorphan-quinidine combination
Physical therapy and gait training; falls risk reduction
Speech therapy if dysarthria/dysphagia
Avoid anticholinergics and benzodiazepines; minimize sedating medications
Caregiver support, advance care planning

Complications

Recurrent stroke
Progressive cognitive and functional decline
Falls and fractures from gait/balance disorder
Aspiration pneumonia from pseudobulbar dysphagia
Pressure ulcers, immobility
Depression (high prevalence — vascular depression hypothesis)
Adverse effects of polypharmacy
Caregiver burden

PANCE pearls

Mixed dementia (AD + VaD) is the most common pathology in advanced age — risk factor control still matters.
Subcortical ischemic vascular dementia (Binswanger-type) presents with gait disturbance and executive dysfunction; memory may be relatively preserved early.
Hypertension control in midlife is the single most modifiable risk factor for late-life cognitive impairment (SPRINT-MIND).
Aspirin does NOT prevent vascular dementia in primary prevention populations (ASPREE).
CADASIL in a younger patient with multiple subcortical strokes, family history, and anterior temporal pole white matter changes — confirm with NOTCH3 testing.
Cerebral amyloid angiopathy presents with recurrent lobar microbleeds and cognitive impairment; avoid anticoagulation when possible.

References

AHA/ASA 2011 — Vascular Contributions to Cognitive Impairment and Dementia (Gorelick et al., Stroke 2011)
AAN — Practice Parameter: Diagnosis of Dementia (Knopman et al., Neurology 2001; reaffirmed)
SPRINT-MIND — Effect of Intensive vs Standard BP Control on Probable Dementia (Williamson et al., JAMA 2019)
NINDS-AIREN — Vascular Dementia: Diagnostic Criteria for Research Studies (Roman et al., Neurology 1993)

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