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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Question 1NeurologyMedium
A 74-year-old man with long-standing hypertension, type 2 diabetes, and a prior transient ischemic attack is brought in by his wife for cognitive decline. She reports that over the past 2 years his thinking has worsened in abrupt steps, each following a period of slurred speech or arm weakness that partly recovered, rather than gradually. He has trouble planning and multitasking and is slow to respond, but recalls recent events fairly well when given cues. He developed a small-stepped, shuffling gait and urinary urgency early in the course. Exam shows brisk reflexes with a left Babinski sign. MRI shows multiple lacunar infarcts and confluent white matter hyperintensities. Which of the following is the most likely diagnosis?
ADementia with Lewy bodies
BNormal pressure hydrocephalus
CVascular dementia
DAlzheimer disease
Reveal answer & full explanation
Correct answer: C — Vascular dementia
ADementia with Lewy bodies
BNormal pressure hydrocephalus
CVascular dementia✓
DAlzheimer disease
Why Vascular dementia is correct
Stepwise decline tied to discrete vascular events, prominent executive dysfunction with relatively preserved cued memory, early gait disturbance, and focal corticospinal signs (hyperreflexia, Babinski) are the classic clinical signature.
MRI showing lacunar infarcts plus confluent white matter hyperintensities (leukoaraiosis) confirms cerebrovascular disease, and the dense vascular risk profile (hypertension, diabetes, prior TIA) supports the etiology.
NINDS-AIREN / VASCOG criteria require cognitive decline, cerebrovascular disease on imaging, and a temporal/causal relationship between them, all present here; a high Hachinski Ischemic Score (>=7) favors vascular over Alzheimer etiology.
Why the others are wrong
Alzheimer disease is an insidious, steadily progressive decline with early, prominent memory loss that does NOT improve with cueing and medial temporal atrophy; it lacks the stepwise course, early focal signs, and extensive lacunar/white-matter burden seen here.
Dementia with Lewy bodies is defined by fluctuating cognition, recurrent visual hallucinations, spontaneous parkinsonism, and REM sleep behavior disorder, none of which are described.
Normal pressure hydrocephalus produces the triad of magnetic gait, urinary incontinence, and cognitive impairment, but with ventriculomegaly out of proportion to atrophy on imaging rather than lacunes and white matter ischemia, and without stepwise infarct-related decline or pyramidal signs.
Question 2NeurologyMedium
A 74-year-old man is brought in by his wife for cognitive changes that have worsened in distinct steps over the past 2 years, with abrupt declines following two episodes of slurred speech and arm weakness. He has trouble planning and multitasking but recalls events well when given cues. His history includes long-standing hypertension, type 2 diabetes, and a 40-pack-year smoking history. On exam he has a small-stepped, magnetic gait, brisk reflexes with a left Babinski sign, and emotional lability. Mini-Mental State Examination is 24/30 with disproportionate executive dysfunction. Which of the following is the most appropriate next diagnostic test to establish the diagnosis?
ALumbar puncture for CSF amyloid and tau
BFluorodeoxyglucose PET of the whole brain
CBrain MRI with gradient-echo sequences
DCarotid duplex ultrasonography of the neck
Reveal answer & full explanation
Correct answer: C — Brain MRI with gradient-echo sequences
ALumbar puncture for CSF amyloid and tau
BFluorodeoxyglucose PET of the whole brain
CBrain MRI with gradient-echo sequences✓
DCarotid duplex ultrasonography of the neck
Why Brain MRI with gradient-echo sequences is correct
Vascular dementia is diagnosed clinically (NINDS-AIREN / VASCOG criteria) by combining cognitive decline with imaging evidence of cerebrovascular disease and a temporal/causal link between them.
MRI is the preferred study because it best demonstrates the defining lesions: cortical/subcortical infarcts, lacunes, confluent white matter hyperintensities (leukoaraiosis), and microbleeds on gradient-echo/susceptibility-weighted sequences.
This patient's stepwise decline, focal corticospinal signs, magnetic gait, executive-predominant deficits, and vascular risk factors make documenting the vascular burden on MRI the key next step.
Why the others are wrong
Lumbar puncture for CSF amyloid and tau is a biomarker workup aimed at Alzheimer disease; it does not establish vascular disease, and the ischemic lesions driving this clearly vascular picture need to be confirmed on imaging first.
Carotid duplex ultrasonography is a reasonable part of secondary-stroke-prevention evaluation to look for an embolic source, but it images vessels, not brain parenchyma, so it cannot confirm the infarcts or white matter disease that define the diagnosis.
Fluorodeoxyglucose PET helps differentiate neurodegenerative dementias by regional hypometabolism patterns; it is a later, adjunctive test, not the first study to demonstrate cerebrovascular disease.
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CADASIL — Young-to-middle-age onset, family history (NOTCH3 mutation), migraine with aura, recurrent subcortical strokes, anterior temporal pole white matter changes
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.
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
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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