Emboli

Embolism
Classification and external resources
Specialty	Vascular surgery
ICD-10	I74, I82, O88, T79.0-T79.1
ICD-9-CM	444.9
DiseasesDB	18165
MeSH	D004617
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An embolism is the lodging of an embolus, a blockage-causing piece of material, inside a blood vessel. The embolus may be a blood clot (thrombus), a fat globule, a bubble of air or other gas (gas embolism), or foreign material. An embolism can cause partial or total blockage of blood flow in the affected vessel. Such a blockage (a vascular occlusion) may affect a part of the body distant from where the embolus originated. An embolism in which the embolus is a piece of thrombus is called a thromboembolism. Thrombosis, the process of thrombus formation, often leads to thromboembolism.

An embolism is usually a pathologic event (that is, part of illness or injury). Sometimes it is created intentionally for a therapeutic reason, such as to stop bleeding or to kill a cancerous tumor by stopping its blood supply. Such therapy is called embolization.

The word embolism comes from the Greek ἐμβολισμός, meaning "interposition".

There are different types of embolism, some of which are listed below.

Embolism can be classified as to where it enters the circulation either in arteries or in veins. Arterial embolism are those that follow and, if not dissolved on the way, lodge in a more distal part of the systemic circulation. Sometimes, multiple classifications apply; for instance a pulmonary embolism is classified as an arterial embolism as well, in the sense that the clot follows the pulmonary artery carrying deoxygenated blood away from the heart. However, pulmonary embolism is generally classified as a form of venous embolism, because the embolus forms in veins, e.g. deep vein thrombosis.

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