TY - CHAP M1 - Book, Section TI - Cardiomyopathy, Ischemic A1 - Doherty, Gerard M. PY - 2010 T2 - Quick Answers Surgery AB - • Normal coronary blood flow: 1 mL per gram of myocardium per minute• Oxygen extraction from coronary bed: 75% at rest, 100% during stress• Coronary flow primarily during diastole• Mean coronary resistance is 3-6 times the totally vasodilated value, implying extreme vasodilator reserve• Atherosclerosis progression: Intimal incorporation of lipids → expanding plaque with fibrosis and calcification → finally rupture of plaque causing thrombosis → acute infarction• Subtotal occlusions important in pathogenesis of unstable angina• Usual pattern-Short, proximal stenoses of left coronary artery-In right coronary artery, disease more diffuse, involving proximal and middle portions of artery-Patients with type 1 diabetes mellitus have diffuse disease• Blood flow may be adequate at rest; exercise and stress may produce ischemia• Acute coronary insufficiency (angina pectoris): Immediate decrease in myocardial work• After only 15 minutes of reversible ischemia, may take 24-48 hrs for complete recovery SN - PB - The McGraw-Hill Companies CY - New York, NY Y2 - 2024/03/29 UR - accesssurgery.mhmedical.com/content.aspx?aid=58106317 ER -