| MVC | maximum voluntary contraction; motor vehicle crash; mucin; multivane collimator; myocardial vascular... |
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| AMI | acquired monosaccharide intolerance; acute myocardial infarction; amitriptyline; anterior myocardial... |
| IMI | immunologically measurable insulin; impending myocardial infarction; Imperial Mycological Institute ... |
| MD | Doctor of Medicine [Lat. Medicinae Doctor]; magnesium deficiency; main duct; maintenance dose; major... |
| MI | first meiotic metaphase; maturation index; medical illustrator; medical informatics; medical inspect... |
| 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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| myocardial necrosis | Irreversible destruction of myocardial (heart muscle) cells. (27 Sep 1997) |
| myocardial perfusion imaging | <radiology> (thallium scanning) thallium (Tl) 201, acts as potassium analog, dose 2.0 - 3.0 mCi at peak exercise, 4% of injected dose reaches myocardium, imaging: exercise (1-5 min), redistribution (3-4 hrs), views: anterior, LAO 45', left lateral, interpretation: normal, reversible abnormalitymost likely to be exercise-induced ischemia, nonreversible abnormalitymost likely to be prior myocardial infarction, reverse redistribution most likely to be normal areas wash out faster, lung activity most likely to be LV failure during exercise see also: dipyridamole test, nuclear cardiology (12 Dec 1998) |
| myocardial reperfusion | Generally, restoration of blood supply to heart tissue which is ischemic due to decrease in normal blood supply. The decrease may result from any source including atherosclerotic obstruction, narrowing of the artery, or surgical clamping. Reperfusion can be induced to treat ischemia. Methods include chemical dissolution of an occluding thrombus, administration of vasodilator drugs, angioplasty, catheterization, and artery bypass graft surgery. However, it is thought that reperfusion can itself further damage the ischemic tissue, causing myocardial reperfusion injury. (12 Dec 1998) |
| myocardial reperfusion injury | Functional, metabolic, or structural changes in ischemic heart muscle thought to result from reperfusion to the ischemic areas. Changes can be fatal to muscle cells and may include oedema with explosive cell swelling and disintegration, sarcolemma disruption, fragmentation of mitochondria, contraction band necrosis, enzyme washout, and calcium overload. Other damage may include haemorrhage and ventricular arrhythmias. One possible mechanism of damage is thought to be oxygen free radicals. Treatment currently includes the introduction of scavengers of oxygen free radicals, and injury is thought to be prevented by warm blood cardioplegic infusion prior to reperfusion. (12 Dec 1998) |
| myocardial revascularization | The restoration of blood supply to the myocardium. (12 Dec 1998) |
| myocardial rigor mortis | Irreversible contraction of the left ventricle of the heart as a complication seen in the early period of cardiopulmonary bypass and now avoided by appropriate cardioplegic solutions. Synonym: myocardial rigor mortis, stone heart. (05 Mar 2000) |
| myocardial stunning | Prolonged dysfunction of the myocardium after a brief episode of severe ischemia, with gradual return of contractile activity. It occurs frequently, both in the experimental laboratory and in clinical medicine. Since stunned myocardium occurs adjacent to necrotic tissue after prolonged coronary occlusion, many myocardial infarcts may be a mixture of necrotic and stunned tissue. (12 Dec 1998) |
| posterior myocardial infarction | Infarction involving the posterior wall of the heart; also formerly used erroneously of infarction's involving the inferior or diaphragmatic surface of the heart. (05 Mar 2000) |
| silent myocardial infarction | Infarction that produces none of the characteristic symptoms and signs of myocardial infarction. (05 Mar 2000) |
| subendocardial myocardial infarction | Infarction that involves only the layer of muscle subjacent to the endocardium. (05 Mar 2000) |
| nontransmural myocardial infarction | Necrosis of heart muscle that fails to extend from the endocardium to the epicardium, often erroneously considered relatively benign. (05 Mar 2000) |
| diaphragmatic myocardial infarction | Infarction in which the inferior or diaphragmatic wall of the heart is involved, producing indicative changes in leads II, III, and aVF in the electrocardiogram. Synonym: diaphragmatic myocardial infarction. (05 Mar 2000) |
| inferior myocardial infarction | Infarction in which the inferior or diaphragmatic wall of the heart is involved, producing indicative changes in leads II, III, and aVF in the electrocardiogram. Synonym: diaphragmatic myocardial infarction. (05 Mar 2000) |
| inferolateral myocardial infarction | Infarction involving the inferior and lateral surfaces of the heart and producing indicative changes in the electrocardiogram in leads II, III, aVF, V5, and V6. (05 Mar 2000) |