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Localized tissue anemia as a result of obstruction of the blood supply or to vasoconstriction.



a local deficiency of blood; insufficient blood in an organ or tissue because of the narrowing or complete occlusion of the lumen of an afferent artery.

Transitory ischemia (like hyperemia) may result from physiological regulation of the blood supply, such as in reflex spasm of an artery caused by a mental factor (fright); the influence of pain, cold, chemical substances (epinephrine, ergotin), and biological stimuli (bacteria, toxins); the obstruction of an artery by a thrombus or embolus; constriction of the lumen of a blood vessel in connection with an atherosclerotic or inflammatory process in the wall; or compression of an artery by a tumor, scar, or foreign body. The aftereffects of ischemia depend on the degree of disruption of the blood flow, the rate of development and duration of the ischemia, the sensitivity of the tissue to oxygen deficiency, and the general condition of the body. Ischemia may end in complete restoration of the structure and function of the affected organ or tissue, but it also may lead to necrosis (infarct). The central nervous system and heart muscle are particularly sensitive to ischemia.


References in periodicals archive ?
Ischaemic heart disease is the most common form of heart disease and a common cause of death in countries around the world.
If an ischaemic stroke is diagnosed, and it has been less than four and a half hours since symptoms started, you may be given a medicine directly into a vein called Alteplase.
Among 58 308 without a history of ischaemic heart disease at baseline, 2 782 developed ischaemic heart disease.
A transient ischaemic attack (TIA), often called a mini-stroke, happens when the brain's blood supply is interrupted for a brief time.
3 cases per 100 000 children per year, of which 80% were arterial ischaemic stroke (AIS).
There are two main types of strokes, ischaemic and haemorrhagic.
4-fold increased risk of ischaemic heart disease (IHD) compared with nurses who reported work pressure to be suitable.
Worldwide, low intake of fruits and vegetables is estimated to cause about 19 percent of gastrointestinal cancer, about 31 percent of ischaemic heart disease and 11 percent stroke," the WHO says on its website.
Patient group: Adults with ischaemic stroke or transient ischaemic attacks (TIAs).
For the latest study, 102 patients who had suffered a first or recurrent ischaemic stroke (caused by a clot) in the previous six months were recruited.
A TIA - a transient ischaemic attack - is essentially a miniature stroke which is caused by a temporary interruption in the blood flow to the brain.
The combined influence of leisure time physical activity and weekly alcohol intake on fatal ischaemic heart disease and all cause mortality.