The American frontier comprises the geography, history, folklore, and cultural expression of life in the forward wave of American westward expansion that began with English colonial settlements in the early 17th century and ended with the admission of the last mainland territories as states in 1912.
Atrial Flutter Causes. Atrial flutter may be caused by abnormalities or diseases of the heart, by a disease elsewhere in the body that affects the heart, or by consumption of substances that change the way electrical impulses are transmitted through the heart. In some people, no underlying cause is ever found.
Causes of Heart flutters that are very common. Causes of Heart flutters that are common. Causes of Heart flutters that are very rare. Causes of Heart flutters without any prevalence information. The following causes of Heart flutters are ones for which we do not have any prevalence information.