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a general loss of cognitive abilities, including impairment of memory as well as one or more of the following: aphasia, apraxia, agnosia, or disturbed planning, organizing, and abstract thinking abilities. It does not include loss of intellectual functioning caused by clouding of consciousness (as in delirium), depression, or other functional mental disorder (pseudodementia). Causes include a large number of conditions, some reversible and some progressive, that result in widespread cerebral damage or dysfunction. The most common cause is Alzheimer's disease; others include cerebrovascular disease, central nervous system infection, brain trauma or tumors, vitamin deficiencies, anoxia, metabolic conditions, endocrine conditions, immune disorders, prion diseases, Wernicke-Korsakoff syndrome, normal-pressure hydrocephalus, Huntington's chorea, multiple sclerosis, and Parkinson's disease.
dementia of the Alzheimer type official name for alzheimer's disease.
Binswanger's dementia a progressive dementia of presenile onset due to demyelination of the subcortical white matter of the brain, with sclerotic changes in the blood vessels supplying it.
boxer's dementia a syndrome more serious than boxer's traumatic encephalopathy, the result of cumulative injuries to the brain in boxers; characterized by forgetfulness, slowness in thinking, dysarthric speech, and slow, uncertain movements, especially of the legs.
epileptic dementia a progressive mental and intellectual deterioration that occurs in a small fraction of cases of epilepsy; it is thought by some to be caused by degeneration of neurons resulting from circulatory disturbances during seizures.
multi-infarct dementia vascular d.
paralytic dementia (dementia paraly´tica) general paresis.
dementia prae´cox (obs.) schizophrenia.
presenile dementia name given to dementia of the Alzheimer type when it occurs in persons younger than age 65.
senile dementia name given to dementia of the Alzheimer type when it occurs in persons aged 65 or older.
substance-induced persisting dementia that resulting from exposure to or use or abuse of a substance, such as alcohol, sedatives, anxiolytics, anticonvulsants, lead, mercury, carbon monoxide, or organophosphate insecticides, but persisting long after exposure to the substance ends, usually with permanent and worsening deficits. Individual cases are named for the specific substance involved.
vascular dementia patchy deterioration of intellectual function resulting from damage by a significant cerebrovascular disorder.
dementia of Alzheimer disease developing after age 65.
A progressive, abnormally accelerated deterioration of mental faculties and emotional stability in old age, occurring especially in Alzheimer's disease.
dementia occurring in older persons, usually over the age of 65. Because most cases are due to Alzheimer's disease, the term is sometimes used as a synonym for dementia of the Alzheimer type, late onset.
Binswanger's dementiaA form of small-vessel vascular dementia caused by ischaemic demyelination of hemispheric white matter.
Impaired executive functions—planning, cognitive flexibility, abstract thinking, initiating appropriate actions and inhibiting inappropriate actions, and selecting relevant sensory information—but have normal episodic or declarative memory, which contrasts sharply with Alzheimer’s disease, which is characterised by intact executive function but memory defects.
Chronic hypertension, advanced age.
CT, MRI, MR spectrography.
senile dementiaThe cognitive decline and progressive neurodegeneration typical of older adults; ischemia of periventricular white matter may cause a significant proportion of SD, which disconnects the relatively intact cerebral cortex, resulting in true subcortical dementia or Binswanger type dementia. Cf Alzheimer's disease, Lacunar state, Multi-infarct dementia, Pseudodementia.
se·nile de·men·ti·a(sen'il dĕ-men'shē-ă)
Cognitive impairment first occurring in the seventh or eighth decade of life, usually due to Alzheimer disease or cerebrovascular impairment.
senile dementiaSee DEMENTIA.
senile dementiaprogressive mental deterioration associated with ageing/old age; characterized by marked short-term memory loss, stubbornness, difficulty with novel experiences, self-centredness and childish behaviour
se·nile de·men·ti·a(sen'il dĕ-men'shē-ă)
Dementia of Alzheimer disease developing after age 65.