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.
Causes. 1  The condition of blood clots in heart can occur when the inner blood vessel walls also known as endothelium get damaged. 2  Rheumatoid arthritis and pregnancy can also result in the formation of clots in the heart. 3  People who have undergone a surgery are more prone to suffer from this condition.