Arterial embolism

Definition

Arterial embolism is a sudden interruption of blood flow to an organ or body part due to a clot (embolus).

Causes

An embolus is a blood clot or a piece of plaque that acts in the same manner as a clot. Emboli means more than one clot. If the clot travels from the site where it formed to another location in the body it is called an embolism.

An arterial embolism may be caused by one or more clots. The clots can get stuck in an artery and block blood flow. The blockage starves tissues of blood and oxygen, which can result in damage or tissue death (necrosis).

Arterial emboli often occur in the legs and feet. Some may occur in the brain, causing a stroke, or the heart, causing a heart attack. Less common sites include the kidneys, intestines, and the eyes.

Atrial fibrillation is a major risk factor for an arterial embolism. The risk of an embolism increases when factors that tend to form clots are increased. Such factors may include injury or damage to an artery wall and conditions that increase blood clotting (such as increased platelet count).

Another condition that poses a high risk for embolization (especially to the brain) is mitral stenosis. Endocarditis (infection of the inside of the heart) can also cause an arterial emboli.

Paradoxical embolization can take place when a clot in a vein enters the right side of the heart and passes through a hole into the left side. The clot can then cause blockage of blood flow to the brain (stroke) or other organs.

If a clot involves the arteries supplying blood flow to the lungs, it is called a pulmonary embolus.