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.
Prior to establishing the nation's capital in Washington, D.C., the United States Congress and its predecessors had met in Philadelphia (Independence Hall and Congress Hall), New York City (Federal Hall), and a number of other locations (Maryland State House in Annapolis, Maryland, Nassau Hall in Princeton, New Jersey).