A cardiac perfusion scan is done to: 1  Find the cause of unexplained chest pain or pressure. 2  Find the cause of chest pain or pressure brought on by exercise. 3  Check for the location and amount of damage caused by a heart attack.hy It Is Done. A cardiac perfusion scan is done to: 1  Find the cause of unexplained chest pain or pressure. 2  Find the cause of chest pain or pressure brought on by exercise. 3  Check for the location and amount of damage caused by a heart attack. 4  Identify coronary artery disease (CAD) .
About Washington D.C. Satellite view is showing Washington D.C., the national capital of the United States, located in the central eastern part of the US on the Potomac River, bordering the U.S. state of Virginia in west and the U.S. state of Maryland in east.
The state of Maryland borders the District of Columbia to the north, east, and west, and the state of Virginia borders the District on the southern shore of the Potomac River. 1  In 1790 the U.S. Congress established a 100-square-mile (260-square-km) territory to serve as the permanent seat of the federal government.