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ischemia (is-ke´me-a)

Local anemia due to mechanical obstruction (mainly arterial narrowing) of the blood supply. [G. ischo, to keep back, + haima, blood]
myocardial i. inadequate circulation of blood to the myocardium, usually as a result of coronary artery disease. See also angina pectoris, myocardial infarction.
postural i. the reduced blood pressure and flow induced in a part, e.g., the leg or foot, by raising it above the heart level; used to reduce bleeding during surgical operations on the extremities.
i. ret´inae diminished blood supply in the retina due to failure of the arterial circulation; it may occur as a result of arterial embolism or spasm; poisoning, as by quinine; or exsanguination from recurring profuse hemorrhages (e.g., in parturition, gastric and duodenal ulcers, and pulmonary tuberculosis); bilateral transitory or permanent blindness may result.
silent i. myocardial i. without accompanying signs or symptoms of angina pectoris; can be detected by EKG and other lab techniques. See also silent myocardial infarction.


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