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.
When we see slower ventricular rates and conduction ratios of 3:1 or more, it is usually due to medications or other causes of enhanced refractoriness of the AV node. Atrial flutter can lead to fast rates at 2:1 conduction, and VERY fast rates at 1:1 conduction. In patients with accessory pathways that bypass the slow conduction of the AV node, like Wolff-Parkinson-White Syndrome, 1:1 conduction of atrial flutter or atrial fib can be life-threatening.