Vascular Dementia: When Strokes and BP Damage the Memory

Vascular dementia (VaD) — dementia caused by cerebrovascular disease — is the second most common cause of dementia worldwide, accounting for 15–20% of cases, and in India, where hypertension and stroke rates are high and younger in onset, vascular contributions to dementia are proportionally even greater. Unlike Alzheimer's disease, vascular dementia is largely preventable — the risk factors are the same as those for stroke, and aggressive management of these factors can slow or prevent progression.

Types of Vascular Dementia

Post-stroke dementia: Occurring after one or more strokes — either a single strategic stroke (affecting memory-critical areas like the hippocampus or thalamus) or multiple strokes (multi-infarct dementia). Onset is often abrupt — the patient is "different" after the stroke — with stepwise progression (stable periods punctuated by abrupt worsening with each new stroke event).

Small vessel disease (SVD): The most common form. Chronic hypertension and diabetes damage the small penetrating arteries supplying the deep white matter and basal ganglia. The changes accumulate silently over years — seen as leukoaraiosis (white matter changes) on MRI. Causes insidious cognitive slowing, executive dysfunction, slowed gait, and urinary urgency — sometimes called "subcortical" dementia.

How It Differs from Alzheimer's

Alzheimer's: typically insidious onset; episodic memory (forgetting recent events) is the earliest feature; language affected early; MRI shows hippocampal atrophy. Vascular: stepwise or insidious; executive function (planning, processing speed) affected early; gait problems common early; MRI shows strokes or white matter change.

Prevention and Treatment

No medication reverses vascular dementia — prevention is everything. Blood pressure control (target below 130/80) is the most important intervention. Diabetes management; antiplatelet therapy after stroke; statin therapy; smoking cessation; regular exercise. Cognitive stimulation and exercise have modest benefit in slowing progression. Sri Anand CNC, Chanda Nagar, Hyderabad. Call +91 90633 66983.