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.
Leg Clots as a Cause of Pulmonary Embolism. Leg clots can form when blood flow is restricted and slows down. This occurs when you do not move around for long periods of time, such as: 1  After some types of surgeries. 2  During a long trip in a car or on an airplane. 3  If you must stay in bed for an extended period of time.