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infarction

infarction (in-fark´shun)

1. Sudden insufficiency of arterial or venous blood supply due to emboli, thrombi, vascular torsion, or pressure that produces a macroscopic area of necrosis; the heart, brain, spleen, kidney, intestine, lung, and testes are likely to be affected, as are tumors, especially of the ovary or uterus. 2. infarct
anterior myocardial i. i. involving the anterior wall of the heart, and producing indicative electrocardiographic changes in the anterior chest leads and often in limb lead I.
anteroinferior myocardial i. i. involving both anterior and inferior walls of the heart simultaneously.
anterolateral myocardial i. extensive anterior i. producing indicative changes across the precordium as well as in leads I and aVL.
anteroseptal myocardial i. an anterior i. in which indicative electrocardiographic changes are confined to the medial chest leads (V1-V4).
cardiac i. myocardial i
diaphragmatic myocardial i. inferior myocardial i
inferior myocardial i. i. in which the inferior or diaphragmatic wall of the heart is involved, producing indicative changes in leads II, III, and aVF in the electrocardiogram.diaphragmatic myocardial i;
inferolateral myocardial i. i. involving the inferior and lateral surfaces of the heart and producing indicative changes in the electrocardiogram in leads II, III, aVF, V5, and V6.
lateral myocardial i. i. involving only the lateral wall of the heart, producing indicative electrocardiographic changes confined to leads I, aVL, V5, and V6.
myocardial i. (MI) i. of an area of the heart muscle, usually as a result of occlusion of a coronary artery.cardiac i;
myocardial i. in dumbbell form i. involving the septum along with both inferior and anterior walls to make an H- or dumbbell-shaped configuration.Roesler-Bressler infarct;
nontransmural myocardial i. (NTMI) necrosis of heart muscle that fails to extend from the endocardium to the epicardium, often erroneously considered relatively benign.
posterior myocardial i. i. involving the posterior wall of the heart; also formerly used erroneously of i.'s involving the inferior or diaphragmatic surface of the heart.
silent myocardial i. i. that produces none of the characteristic symptoms and signs of myocardial i.
subendocardial myocardial i. i. that involves only the layer of muscle subjacent to the endocardium.
through-and-through myocardial i. transmural myocardial i
transmural myocardial i. i. that involves the whole thickness of the heart muscle from endocardium to epicardium.through-and-through myocardial i;
watershed i. cortical i. in an area where the distribution of major cerebral arteries meet or overlap.

 

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