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.
Atrial flutter â Atrial flutter is an atrial arrhythmia that can be treated with cardioversion. The success rate is 90 to 100 percent. Success is not related to the duration of this arrhythmia. Anticoagulation is also given prior to and after cardioversion, as it is in patients with AF.