One night when Blackwell was eleven, a fire destroyed her father's business. In 1832, the family emigrated to the United States and set up a refinery in New York City. The Blackwells were very religious Quakers, believing that all men and women were equal in the eyes of God.
What causes atrial flutter? Atrial flutter may be caused by abnormalities of the heart, by diseases of the heart, or by diseases elsewhere in the body that affect the heart. Atrial flutter may also be caused by consuming substances that change the way electrical impulses are transmitted through the heart. Atrial flutter can occur after open heart surgery.
Atrial flutter is a milder form of atrial arrhythmia than is atrial fibrillation; the atrial rate is slower but still â300 activations/min. Often, every second beat is conducted to the ventricles, yielding a heart rate of â150 beats/min. Atrial flutter can progress to atrial fibrillation, and its causes are similar.