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- W2083219900 abstract "Effective therapy for patients with unstable angina or evolving myocardial infarction following coronary bypass surgery requires accurate delineation of the pathoanatomy and prompt intervention. We therefore performed cardiac catheterization in 10 consecutive patients: four with acute myocardial infarction and six with refractory unstable angina (NYHA class IV). All patients with acute myocardial infarction were found to have completely thrombosed vein grafts supplying totally occluded native coronary arteries. In three patients with evolving myocardial infarction occurring within 4 weeks of coronary bypass surgery, graft thrombosis was caused by venous valves in two patients and a suboptimal anastomosis in a third. The fourth patient sustained a myocardial infarction 7 years after coronary bypass surgery with atherosclerotic plaque rupture causing vein graft thrombosis. Therapy with intragraft streptokinase resulted in complete clearing of thrombus, pain relief, and control of injury current in all four patients. Rest angina with concomitant ST and T wave changes occurred in six patients. In two patients symptoms occurred early (within 6 months), whereas angina developed 4 to 10 years after coronary bypass graft surgery in four patients. In the two patients with early recurrence of symptoms suboptimal anastomosis was found in one, while the other patient had a venous valve in the vein graft in conjunction with a stenosis in the native coronary artery. In three of four patients with late recurrence of angina, symptoms developed as a result of atherosclerotic stenosis in their vein grafts; in the fourth patient an occluded graft was found to supply a stenosed native coronary artery. Transluminal angioplasty was successfully performed in all six patients. We conclude: (1) myocardial infarction and unstable angina occurring early after coronary bypass surgery are caused by graft thrombosis as a result of mechanical graft problems, (2) late events are caused by atherosclerotic stenosis and plaque rupture, and (3) interventional catheterization with streptokinase and angioplasty are effective therapy for patients with recurrent ischemia or infarction following coronary bypass graft surgery." @default.
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- W2083219900 date "1985-04-01" @default.
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- W2083219900 title "Unstable angina and evolving myocardial infarction following coronary bypass surgery: Pathogenesis and treatment with interventional catheterization" @default.
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- W2083219900 doi "https://doi.org/10.1016/0002-8703(85)90633-7" @default.
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