Elizabeth Blackwell (3 February 1821 â 31 May 1910) was the first female doctor in the United States and the first on the UK Medical Register. She was the first openly identified woman to graduate from medical school, a pioneer in educating women in medicine in the United States, and was prominent in the emerging women's rights movement.
According to Medilexicon's medical dictionary, atrial fibrillation is fibrillation in which the normal rhythmic contractions of the cardiac atria are replaced by rapid irregular twitchings of the muscular wall; the ventricles respond irregularly to the dysrhythmic bombardment from the atria..
Atrial fibrillation, or A-Fib, is a common arrhythmia in which the heart's upper chambers (the atria) quiver rather than contract (squeeze) normally, sometimes as many as 600 times per minute. This causes the heart's lower chambers (the ventricles) to contract out of rhythm and faster than normal. Without treatment, A-Fib can lead to other serious heart problems, like enlargement of the heart (called cardiomyopathy) and heart failure (when the heart cannot fill or pump enough blood to meet the body's needs).