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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 ?
I want to draw the attention of the reader to the need for further research on the Ajwa extract for the treatment and prevention of ischaemic heart disease.
9% of patients with Ischaemic vascular disease were prescribed antiplatelet medications in 2007-2008 while the rates were even lower in primary care.
Ischaemic heart disease is the most common cause of death after dementia, yet there is concern that patients in North Wales are not receiving timely investigation and treatment.
It also aimed to clarify possible differences in sleep disturbances between ischaemic heart disease and stroke.
Rubeosis iridis was noted in 3 patients (25%) with ischaemic CRVO within four to six months and they went on to develop neovascular glaucoma one to two months later.
6 times as likely to experience an ischaemic stroke but were no more likely to develop dementia.
There is only one drug currently approved to treat ischaemic stroke in the UK.
The cavernous blood gases (Table 1) showed hypoxia, hypercapnia, and acidosis which confirmed the diagnosis of ischaemic priapism.
Ischaemic stroke is caused by interruption to the blood flow to the brain due to clot.
Identifying patients who have ischaemic but still viable tissue, the penumbra, is important, as is not selecting patients with large established infarcts.
Clinical examination allows the practitioner to define the type of RVO and establish whether it is ischaemic or non-ischaemic.
Louis, MO) solution was injected intravenously into the femoral vein to distinguish ischaemic from nonischaemic areas.