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Neurogenic shock may be caused by severe brain injury. [6] However, in case of increased intracranial pressure , according to the Cushing triad , blood pressure will be increased (unless decreased from hypovolemia ), respirations will be irregular and bradycardia will also be a feature.
Dementia may occur when neurodegenerative and cerebrovascular pathologies are mixed, as in susceptible elderly people (75 years and older). [2] [5] Cognitive decline can be traced back to occurrence of successive strokes. [4] ICD-11 lists vascular dementia as dementia due to cerebrovascular disease. [1]
Orthostatic syncope refers to syncope resulting from a postural decrease in blood pressure, termed orthostatic hypotension. [1]Orthostatic hypotension occurs when there is a persistent reduction in blood pressure of at least 20mmHg systolic or 10mmHg diastolic within three minutes of standing or being upright to 60 degrees on the head-up tilt table.
Cerebral atrophy is a common feature of many of the diseases that affect the brain. [1] Atrophy of any tissue means a decrement in the size of the cell, which can be due to progressive loss of cytoplasmic proteins.
[6] [7] Regional volume reduction is not uniform; some brain regions shrink at a rate of up to 1% per year, whereas others remain relatively stable until the end of the life-span. [8] The brain is very complex, and is composed of many different areas and types of tissue, or matter.
Older patients affected with the cerebral form will present with similar symptoms. Untreated, cerebral ALD is characterized by progressive demyelination leading to a vegetative state and death. [2] Adult males with an adrenomyeloneuropathy presentation typically present initially with muscle stiffness, paraparesis and sexual dysfunction. [3]
Even small increases in the blood pressure may be sufficient to maintain blood flow to the brain on standing. [33] In dysautonomic patients who do not have a diagnosis of high blood pressure, drinking 2–3 liters of fluid a day and taking 10 g of salt can improve symptoms, by maximizing the amount of fluid in the bloodstream. [33]
In the elderly, hypoglycemia can produce focal stroke-like effects or a hard-to-define malaise. [medical citation needed] The symptoms of a single person do tend to be similar from episode to episode. In the large majority of cases, hypoglycemia severe enough to cause seizures or unconsciousness can be reversed without obvious harm to the brain.