| myocardial ischemia | A disorder of cardiac function caused by insufficient blood flow to the muscle tissue of the heart. The decreased blood flow may be due to narrowing of the coronary arteries (coronary arteriosclerosis), to obstruction by a thrombus (coronary thrombosis), or less commonly, to diffuse narrowing of arterioles and other small vessels within the heart. Severe interruption of the blood supply to the myocardial tissue may result in necrosis of cardiac muscle (myocardial infarction). (12 Dec 1998) |
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| cerebral ischemia | Deficiency in blood supply to the brain. (12 Dec 1998) |
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| cerebral ischemia, transient | Nonconvulsive, reversible, focal neurologic deficits lasting minutes up to about 24 hours, resulting mainly from arteriosclerosis, emboli, or hypertensive episodes. (12 Dec 1998) |
| postural ischemia | 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. (05 Mar 2000) |
| silent ischemia | Myocardial ischemia without accompanying signs or symptoms of angina pectoris; can be detected by EKG and other lab techniques. See: silent myocardial infarction. (05 Mar 2000) |
| hypoxia-ischemia | See hypoxia. Ischemia refers to blood flow to cells and organs that is not sufficient to maintain their normal function. (12 Dec 1998) |
| ischemia | <physiology> A low oxygen state usually due to obstruction of the arterial blood supply or inadequate blood flow leading to hypoxia in the tissue. Origin: Gr. Haima = blood (13 Nov 1997) |
| ischemia-modifying factors | Various factors that play a role in determining the extent of necrosis with cerebral stroke; these include blood viscosity and osmolality, the blood pressure, and the anatomy of the neck and intracranial arteries. (05 Mar 2000) |
| ischemia retinae | 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 haemorrhages (e.g., in parturition, gastric and duodenal ulcers, and pulmonary tuberculosis); bilateral transitory or permanent blindness may result. (05 Mar 2000) |
| anterior myocardial infarction | Infarction involving the anterior wall of the heart, and producing indicative electrocardiographic changes in the anterior chest leads and often in limb lead I. (05 Mar 2000) |
| anteroinferior myocardial infarction | Infarction involving both anterior and inferior walls of the heart simultaneously. (05 Mar 2000) |
| anterolateral myocardial infarction | Extensive anterior infarction producing indicative changes across the precordium as well as in leads I and aVL. (05 Mar 2000) |
| anteroseptal myocardial infarction | An anterior infarction in which indicative electrocardiographic changes are confined to the medial chest leads (V1-V4). (05 Mar 2000) |
| biopsy, myocardial | <investigation, procedure, surgery> A procedure which involves the removal of a small specimen of cardiac muscle tissue for microscopic analysis. This is generally performed at the same time as a cardiac catheterisation or as a very similar, yet separate, procedure. A small piece of heart tissue is taken via a small forceps inserted into the cardiac catheter site (usually threaded through a vein in the neck). This test may reveal the cause of a cardiomyopathy, myocarditis, amyloidosis or a heart transplant rejection. (21 Mar 1998) |
| myocardial | Refers to the heart's muscle mass. (09 Oct 1997) |
| myocardial biopsy | <procedure> A procedure which involves the removal of a small specimen of cardiac muscle tissue for microscopic analysis. This is generally performed at the same time as a cardiac catheterisation or as a very similar, yet separate, procedure. A small piece of heart tissue is taken via a small forceps inserted into the cardiac catheter site (usually threaded through a vein in the neck). This test may reveal the cause of a cardiomyopathy, myocarditis, amyloidosis or a heart transplant rejection. (27 Sep 1997) |