Infarction
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In medicine, an infarction results in the death of a macroscopic area of tissue in an organ due to loss of adequate blood supply. This dead tissue is then known as necrotic. The supplying arteries may be blocked by an obstruction (e.g. a blood clot or fatty cholesterol deposit), may be mechanically compressed, or ruptured by trauma.
An infarction is commonly associated with atherosclerosis; where an atherosclerotic plaque ruptures, a thrombus forms on the surface occluding the blood flow and occasionally forming an embolus that occludes other blood vessels downstream. Infarctions can also involve mechanical blockage of the blood supply, such as when part of the gut herniates or twists.
[edit] Classification
Infarctions are divided into two types according to the amount of hemorrhaging present:
- White infarctions (anemic infarcts) affect solid organs such as the heart, spleen, and kidneys. The occlusion is most often composed of platelets, and the organ becomes white, or pale.
- Red infarctions (hemorrhagic infarcts), generally affecting the lungs. The occlusion consists more of red blood cells and fibrin strands.
[edit] Diseases
Diseases commonly associated with infarctions include:
- Myocardial infarction (heart attack)
- Pulmonary embolism ("lung attack")
- Cerebrovascular accident (stroke – 80% are due to infarction)
- Peripheral artery occlusive disease (the most severe form of which is gangrene)
- Antiphospholipid syndrome
- Sepsis
- Giant-cell arteritis (GCA)
- Hernia
- Volvulus
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