# Vascular Dementia > Vascular dementia for NEET-PG Medicine: stepwise decline, subcortical pattern, Hachinski score, strategic infarcts, imaging findings and CADASIL essentials. - Canonical URL: https://prepelephant.com/topics/neet-pg/medicine/vascular-dementia - Exam / course: NEET-PG · Subject: Medicine - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Vascular Dementia", PrepElephant, https://prepelephant.com/topics/neet-pg/medicine/vascular-dementia ## Direct answer Stepwise decline with early gait slowing, not smooth amnesia, is the bedside signature of vascular dementia — cognitive impairment caused by cerebrovascular disease, diagnosed by a dementia syndrome plus imaging evidence of ischaemic burden (lacunes, white matter hyperintensities, or infarcts) and a temporal or logical link between the vessels and the mind. A Hachinski ischaemic score of 7 or more traditionally supports the vascular contribution, and management is aggressive risk-factor control, since no drug repairs infarcted tissue. ## What you must remember - Typical tempo: stepwise deterioration with plateaus, often abutting a clinically evident stroke; onset is usually later than Alzheimer's, with vascular risk factors prominent. - Subcortical ischaemic vascular disease (Binswanger type): periventricular white matter change with slow gait, executive dysfunction, pseudobulbar features (labile affect, dysarthria, dysphagia) and early urinary urgency. - Strategic infarct dementia: single small infarcts in the wrong place — dominant thalamus, angular gyrus, basal forebrain — can produce dementia without widespread disease. - Hachinski ischaemic score: 7 or more supports vascular dementia, 4 or less suggests degenerative disease; items include abrupt onset, stepwise progression, fluctuation, nocturnal confusion, depression, somatic complaints, emotional incontinence, hypertension, strokes and focal signs. - Imaging: MRI shows lacunar infarcts, confluent white matter hyperintensities (Fazekas scale grades severity) and often associated atrophy; "mixed dementia" — vascular plus Alzheimer pathology — is common and is not a diagnosis of exclusion but an expectation. - CADASIL: NOTCH3 mutation, autosomal dominant, migraine with aura, recurrent subcortical strokes and early dementia in mid-life, with characteristic anterior temporal white matter changes and external capsule involvement on MRI; no disease-modifying therapy exists. - Management: blood pressure control is the single best-evidenced intervention, plus statins, diabetes control, smoking cessation and antiplatelet therapy where ischaemic disease warrants it. - Cholinesterase inhibitors and memantine show, at best, modest and inconsistent benefit; they are not the treatment backbone the way vascular risk control is. ## Reasoning through a bedside differential A 72-year-old hypertensive man is brought for "memory loss". The history does the diagnosing: his family describes two discrete drops in function — one after a hospitalisation for a right-sided weak spell, one eight months later with a fall — and between episodes he was stable, though slower. He now shuffles with small steps out of proportion to his parkinsonian signs, laughs and cries abruptly, and has begun rushing to the toilet. Contrast the alternative: an Alzheimer presentation drifts — the family cannot date the start, recent memory leads the complaint, gait remains preserved until late, and disorientation to place precedes incontinence. His examination shows brisk reflexes with a right plantar response, and his Hachinski score counts abrupt onset, stepwise course, emotional incontinence, hypertension, prior stroke history and focal signs — well past 7. MRI then quantifies the burden: lacunes in the basal ganglia, confluent periventricular hyperintensities, and a small old dominant-hemisphere infarct. Three clinical pieces now lock — tempo, subcortical-predominant syndrome and imaging — and the plan follows: blood pressure to target (the strongest evidence in this whole field), statin and antiplatelet for his ischaemic indications, glycaemic and lifestyle control, and honest counselling that donepezil may help cognition modestly at best. Had he been 46 with migraines since youth and a father institutionalised with "early dementia", the same MRI logic points to CADASIL — and to NOTCH3 testing plus family counselling. ## How the exam frames it The most common framing contrasts tempo and profile: stepwise versus gradual, gait-and-executive early versus memory early, fluctuating mood and pseudobulbar features versus insidious amnesia — and the single best-answer hinge is often the Hachinski cutoff or the "strategic infarct" concept (a thalamic infarct causing dementia in one question stem). CADASIL is the fashionable pick: NOTCH3, migraine with aura, white matter changes in the anterior temporal pole, and the absence of hypertension — that last detail separating it from ordinary hypertensive small-vessel disease. "Mixed dementia" appears as the correct answer when vascular imaging coexists with a classic Alzheimer's history. ## Frequently asked questions ### Which clinical score supports a vascular contribution to dementia? The Hachinski ischaemic score — 7 or more traditionally favours vascular dementia, 4 or less a degenerative cause. ### What is strategic infarct dementia? Dementia produced by a single infarct in a cognition-critical region, such as the dominant thalamus or angular gyrus, rather than by widespread ischaemic burden. ### Which monogenic vascular dementia has MRI-sensitive anterior temporal changes? CADASIL, from NOTCH3 mutations — migraine with aura, recurrent subcortical strokes and early dementia, inherited autosomal dominantly. ### Which intervention has the best evidence in vascular dementia? Vascular risk factor control above all — blood pressure management, plus statins, glycaemic control and smoking cessation; cholinesterase inhibitors offer at best modest benefit. ### How does the gait of subcortical vascular disease present? Short-stepped, wide-based "magnetic" gait with freezing, disproportionate to weakness, accompanying executive dysfunction and urinary urgency — the small-vessel triad.