When the acute occlusion in coronary artery happens, coronary blood flow stops, and if not enough collateral flow, infarction results. What happens next?
Shortly after the onset of the infarct a small amount of blood will begin to works its way into the infarcted area. Local vessels dilate and filled w/stagnant blood. Because the muscle fibers are continuing to use up whatever O2 avail. The HgB becomes deoxygenated. The color that the infarcted area takes on is bluish/brownish hue because of deoxygenated HgB. Blood vessels engorged blue/brown color. As progression, vessel walls becomes highly permeable and fluid leaks out, local tissue around area of infarct becomes edematous. Decrease cell metabolism, no blood supply effectively so at this point the muscle dies