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Blood flow may increase up to twice the normal flow but no more. If the increased blood flow is sufficient to supply the brain's oxygen needs then no symptoms will result. [6] However, if blood flow cannot be increased or if doubled blood flow does not correct the problem, symptoms of cerebral hypoxia will begin to appear.
Ischemia, meaning insufficient blood flow to a tissue, can also result in hypoxia in the affected tissues. This is called 'ischemic hypoxia'. Ischemia can be caused by an embolism, a heart attack that decreases overall blood flow, trauma to a tissue that results in damage reducing perfusion, and a variety of other causes.
A cerebral vasodilator is a drug which acts as a vasodilator in the brain. [1] [2] They are used to improve blood flow in people with cerebrovascular insufficiency and to treat neurological disorders secondary to this condition. [2] A number of different cerebral vasodilators exist.
These drugs increase the permeability of the blood–brain barrier temporarily by increasing the osmotic pressure in the blood which loosens the tight junctions between the endothelial cells. By loosening the tight junctions normal injection of drugs through an [IV] can take place and be effective to enter the brain. [ 8 ]
Scientists observed that slow synchronized oscillations of the neurotransmitter norepinephrine, along with cerebral blood and cerebrospinal fluid (CSF), combine during non-rapid eye movement sleep ...
Antidepressants are a class of medications used very commonly to treat depression. In fact, nearly 13 percent of people 12 and over in the U.S. used antidepressants in 2017, according to the ...
Barbiturates reduce the metabolic rate of brain tissue, as well as the cerebral blood flow. With these reductions, the blood vessels in the brain narrow, resulting in a shrunken brain, and hence lower intracranial pressure. The hope is that, with the swelling relieved, the pressure decreases and some or all brain damage may be averted. Several ...
Beta-blockers are a class of medications that are mostly used to treat cardiovascular diseases like high blood pressure. But beta blockers can make it harder for people to sweat and appropriately ...