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Dementia
9 notes available
1 Last Minute Review 2 Alzheimer Disease 3 Frontotemporal Dementia 4 Lewy Body & Parkinson Dementia 5 Vascular Cognitive Impairment 6 Rapidly Progressive Dementias 7 Reversible & Secondary Dementias 8 Mild Cognitive Impairment & Dementia Workup 9 Behavioral & Psychiatric Features
Clinical › Dementia

Vascular Cognitive Impairment

Vascular Cognitive Impairment

What You'll Learn

  • VCI is a spectrum: Ranges from vascular MCI (subjective/mild deficits) through vascular dementia — encompasses all cognitive impairment attributable to cerebrovascular disease
  • Executive dysfunction > memory loss early on: Processing speed and executive function are disproportionately affected compared to AD, where episodic memory loss predominates
  • Strategic single infarct dementia: A single stroke in a critical location (thalamus, caudate, angular gyrus, PCA territory, hippocampus) can cause dementia — high-yield board topic
  • CADASIL: NOTCH3 mutation (chromosome 19), autosomal dominant; migraine with aura → strokes → subcortical dementia; anterior temporal WMH + external capsule involvement; GOM on skin biopsy; IV thrombolysis is not absolutely contraindicated in CADASIL — case series show feasibility but increased theoretical ICH risk due to microbleed burden, so decision is individualized (CADASIL is not listed as a contraindication in AHA/ASA guidelines)
  • CAA and cognition: Lobar microbleeds sparing deep structures, superficial siderosis, lobar ICH; significant overlap with AD; Boston criteria 2.0 for diagnosis
  • Mixed dementia (AD + VCI): Most common dementia pathology in the elderly; vascular and neurodegenerative pathologies are additive/synergistic
  • Treatment: Vascular risk factor management is the cornerstone (hypertension is #1); no FDA-approved cognitive enhancers; cholinesterase inhibitors have modest evidence only
HighYield Pearls
  • Subcortical pattern: Executive dysfunction + processing speed slowing + gait disorder + urinary urgency + frontal release signs > episodic memory loss — opposite of AD; supports VCI / Binswanger over AD
  • Strategic infarct dementia: Single lesion in thalamus (anterior nucleus), caudate, angular gyrus, or medial frontal → acute-onset dementia after one stroke — classic vignette
  • Binswanger: Long-standing HTN + extensive periventricular WMH + lacunes + cortical sparing + executive/gait predominant — mimics NPH; imaging distinguishes
  • CADASIL = NOTCH3 (chr 19) AD: Mid-life migraine WITH aura → recurrent lacunar strokes → subcortical dementia; anterior temporal pole + external capsule WMH; GOM on skin biopsy; earlier onset than sporadic SVD
  • CARASIL = HTRA1 AR: Alopecia + spondylosis + early-onset SVD — "CADASIL minus migraine plus hair/spine"
  • Microbleed distribution: Strictly LOBAR = CAA (Boston 2.0); DEEP / mixed = hypertensive arteriolopathy — drives anticoag decision
  • Mixed VaD+AD is most common elderly dementia pathology; cholinesterase inhibitors + memantine give only modest benefit — mostly via AD component
  • SPRINT-MIND: Intensive BP control (target SBP <120; broadly <130/80) significantly reduced MCI and the composite of MCI + probable dementia; probable dementia ALONE was NOT significantly reduced — HTN treatment remains the single highest-yield preventive intervention
  • NINDS-AIREN criteria for VaD: Cognitive impairment + cerebrovascular disease on imaging + temporal relationship (within 3 months of stroke or stepwise/fluctuating course)
  • FDG-PET: Patchy multi-focal hypometabolism in VCI vs symmetric temporoparietal/posterior cingulate in AD — helps when CSF/amyloid PET unavailable
🔍 Quick ReferenceClinical · Imaging · Etiology / treatment
Clinical phenotype
  • Stepwise cognitive decline with focal deficits → Multi-infarct dementia
  • Executive dysfunction + gait disorder + urinary incontinence + long-standing HTN → Binswanger (subcortical ischemic VaD)
  • Acute dementia after single thalamic stroke (anterior nucleus) → Strategic infarct dementia
  • Mid-life migraine with aura → recurrent lacunar strokes → subcortical dementia, AD inheritance → CADASIL
  • Early-onset SVD + alopecia + lumbar spondylosis, AR inheritance → CARASIL
  • Elderly with recurrent lobar ICH + transient focal neuro episodes + cognitive decline → Cerebral amyloid angiopathy (CAA)
Imaging signs
  • Anterior temporal pole + external capsule WMH → CADASIL
  • Strictly LOBAR microbleeds + cortical superficial siderosis → CAA (Boston 2.0 criteria)
  • Deep / basal ganglia / brainstem microbleeds → Hypertensive arteriolopathy
  • Confluent periventricular WMH + multiple lacunes (<15 mm) with cortical sparing → Binswanger / subcortical ischemic SVD
  • Fazekas 3 WMH + ≥3 deep lacunes → High-burden SVD predicting cognitive decline
  • Patchy multi-focal cortical hypometabolism on FDG-PET → Vascular cognitive impairment (vs symmetric posterior in AD)
  • STRIVE features: WMH, lacunes, microbleeds, enlarged perivascular spaces, atrophy → Small vessel disease neuroimaging standard
Etiology / treatment
  • NOTCH3 mutation on chromosome 19 + granular osmiophilic material (GOM) on skin biopsy → CADASIL
  • HTRA1 mutation, autosomal recessive → CARASIL
  • Intensive BP control (SBP <120) reduces MCI and the composite of MCI + probable dementia (probable dementia alone NOT significant) → SPRINT-MIND trial
  • Multidomain lifestyle intervention (diet, exercise, cognitive, vascular) prevents decline → FINGER trial
  • Anticoagulation for AF → Reduces vascular cognitive decline
  • Antiplatelet for symptomatic ICVD, NOT for asymptomatic SVD/WMH → Standard secondary prevention principle
  • Cholinesterase inhibitors + memantine give only modest benefit → Mixed VaD + AD (effect largely via AD component)
VCI Spectrum & Subtypes

The VCI Continuum

  • Vascular cognitive impairment (VCI) = umbrella term for all cognitive disorders attributable to cerebrovascular disease
  • Replaces the older, narrower term “vascular dementia”
  • Spectrum:
    • Vascular MCI: Objective cognitive deficits (typically executive/processing speed) with preserved functional independence
    • Vascular dementia: Cognitive deficits severe enough to impair daily functioning
  • Can be caused by large vessel disease, small vessel disease, strategic infarcts, hemorrhage, or hypoperfusion

Major Subtypes

Subtype Mechanism Key Features
Multi-infarct dementia Cumulative volume of multiple cortical/subcortical infarcts Stepwise decline; focal neurological signs; bilateral infarcts on imaging; threshold effect (~50–100 mL total infarct volume)
Strategic single infarct dementia Single infarct in a cognitively critical location Acute-onset cognitive decline after stroke in thalamus, caudate, angular gyrus, PCA territory, hippocampus, or ACA/medial frontal
Subcortical ischemic vascular dementia (Binswanger disease) Chronic small vessel disease → diffuse WMH + lacunes Insidious executive dysfunction, psychomotor slowing, gait disorder, urinary incontinence; extensive periventricular WMH
Post-stroke dementia Dementia developing within 3–6 months after stroke Affects ~30% of stroke survivors; pre-existing neurodegeneration + acute vascular insult; left hemisphere and recurrent strokes increase risk
Mixed dementia (VCI + AD) Co-existing vascular and Alzheimer pathology Most common pathology at autopsy in elderly dementia; additive/synergistic cognitive effects; lower threshold for clinical dementia
💎 Board Pearl
  • Binswanger disease = subcortical ischemic vascular dementia: Diffuse WMH + lacunes + executive dysfunction + gait disorder + urinary incontinence in a patient with long-standing hypertension. The triad of cognitive decline + gait + urinary symptoms mimics normal pressure hydrocephalus (NPH) — imaging distinguishes the two
  • Post-stroke dementia affects ~30% of stroke survivors — pre-existing subclinical neurodegeneration (especially AD) lowers the threshold for dementia after acute vascular insult
VICCCS 2014/2017 Classification

VICCCS Subtypes of Vascular Cognitive Impairment

  • VICCCS (Vascular Impairment of Cognition Classification Consensus Study) — 2014/2017 international consensus harmonizing VCI nomenclature
  • Defines four major subtypes of vascular dementia:
    • Post-Stroke Dementia (PSD): Dementia developing within 6 months of a clinically symptomatic stroke event
    • Subcortical Ischemic Vascular Dementia (SIVD): Dementia from chronic small vessel disease (lacunes + WMH); includes Binswanger disease
    • Multi-Infarct Dementia (MID): Dementia caused by multiple cortical/subcortical infarcts with cumulative cognitive burden
    • Mixed Dementia: Vascular pathology coexisting with AD or other neurodegenerative disease (DLB, FTD, etc.)
  • VICCCS also defines “Mild VCI” (formerly vascular MCI) and “Major VCI” (vascular dementia) along the severity axis
💎 Board Pearl
  • VICCCS 4 subtypes: PSD, SIVD, MID, Mixed — memorize this list for board recall
  • Mixed dementia under VICCCS requires evidence of BOTH vascular pathology AND a neurodegenerative process (AD most common)
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