In this article. Mitral valve prolapse is a common cause of a heart murmur caused by a leaky heart valve. Most cases of mitral valve prolapse are not serious and only need to be monitored. Mitral valve prolapse is associated with many other symptoms and conditions.n mitral valve prolapse, the valve slips backward due to the abnormal size of or damage to the mitral valve tissues. For most people with mitral valve prolapse, the cause is unknown.
Illinois is the most populous of the states and North Dakota the least. A 2012 report from the United States Census put the population of the Midwest at 65,377,684. The Midwest is divided by the Census Bureau into two divisions. The East North Central Division includes Illinois, Indiana, Michigan, Ohio and Wisconsin, all of which are also part of the Great Lakes region.
However, as david argues, the midwest region globally includes many areas outside of what we traditionally refer to as the midwest, USA. It seems to me that the term midwest arose domestically (likely before 1884), not as a global indicator. Read this from North Dakota State University: http://www.ext.nodak ...