1. Infarction is localized tissue death caused by reduced blood supply, usually from arterial blockage. 2. The main causes of infarction are arterial obstruction, capillary occlusion, or venous obstruction which leads to ischemia, hypoxia, thrombus formation, and ultimately necrosis in the affected tissue. 3. Infarctions are classified based on their color (red hemorrhagic or white anemic) and presence of infection. Factors that influence infarction development include the anatomy of blood supply, rate of occlusion, tissue susceptibility to hypoxia, and degree of hypoxemia. Common sites of infarction include the heart, brain, intestines, kidneys, and liver.