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Dementia resulting from stroke

People with vascular dementia present with progressive cognitive impairment, acutely or sub acutely as in mild cognitive impairment, frequently step wise, after multiple strokes. Signs and symptoms are cognitive, motor, behavioral, and for a significant proportion of people, also affective. These changes typically occur over a period of 5–10 years. Signs are typically the same as in other dementias, but mainly include cognitive decline and memory impairment of sufficient severity as to interfere with activities of daily living, sometimes with presence of focal neurological signs, and evidence of features consistent with cerebrovascular disease on brain imaging (CT or MRI). In the more severely affected people, or those affected by infarcts in Wernicke's or Broca's areas, specific problems with speaking called dysarthria and aphasias may be present.

Vascular dementia can be caused by ischemic or hemorrhagic infarcts affecting multiple brain areas, including the anterior cerebral artery territory, the parietal lobes, or the cingulate gyrus. A history of stroke increases the risk of developing dementia by around 70%, and recent stroke increases the risk by around 120%. Brain vascular lesions can also be the result of diffuse cerebrovascular disease, such as small vessel disease. The recommended investigations for cognitive impairment include: blood tests (for anemia, vitamin deficiency, thyrotoxicosis, infection, among others), chest xray, ECG, and neuroimaging, preferably a scan with a functional or metabolic sensitivity beyond a simple CT or MRI. The screening blood tests typically include full blood count, liver function tests, thyroid function tests, lipid profile, erythrocyte sedimentation rate, C reactive protein, syphilis serology, calcium serum level, fasting glucose, urea, electrolytes, vitamin B 12, and folate.

Gross examination of the brain may reveal noticeable lesions and damage to blood vessels. Microinfarcts may also be present in the gray matter (cerebral cortex), sometimes in large numbers. Since stroke is an essential part of vascular dementia, These medications include angiotensin converting enzyme inhibitors, diuretics, calcium channel blockers, sympathetic nerve inhibitors, angiotensin II receptor antagonists or adrenergic antagonists. A 2023 review found that therapy with statin drugs was ineffective in treating or preventing stroke or dementia in people without a history of cerebrovascular disease.

As of 2024, there are no medications used specifically for prevention or treatment of vascular dementia. If the person was hospitalized for dementia, the mortality was even higher than in people hospitalized for cardiovascular disease. another 2014 study found that the prognosis for people with vascular dementia was worse for male and older people. Vascular dementia may be a direct cause of death due to the possibility of a fatal interruption in the brain's blood supply.

Vascular dementia is the second most common form of dementia after Alzheimer's disease in older adults. A 2018 meta analysis identified 36 studies of prevalent stroke (1.9 million participants) and 12 studies of incident stroke (1.3 million participants). For prevalent stroke, the pooled hazard ratio for all cause dementia was 1.69; for incident stroke, the pooled risk ratio was 2.18. Study characteristics did not modify these associations, with the exception of sex, which explained 50.2% of between study heterogeneity for prevalent stroke. These results confirm that stroke is a strong, independent, and potentially modifiable risk factor for all cause dementia.