See also: List of states and territories of the United States. This table includes abbreviations for three independent nations related to the United States through Compacts of Free Association, and other comparable postal abbreviations, including those now obsolete. Codes and abbreviations for U.S. states, territories and other regions.
Pulmonary embolism is the sudden blockage of a major blood vessel (artery) in the lung, usually by a blood clot . In most cases, the clots are small and are not deadly, but they can damage the lung. But if the clot is large and stops blood flow to the lung, it can be deadly.
Pulmonary embolism is caused by a sudden blockage of a major blood vessel-- the artery--usually caused by a large blood clot, which in most cases emanates from the deep veins in the leg, commonly known as deep vein thrombosis (DVT) When the clot travels to the lungs, it blocks the lung artery, stopping blood flow to the lungs.