www.zfforaf.com Atrial fibrillation (AF or AFib) is an irregular heart rhythm originating in the top chambers of the heart, called atria, and often causes a rapid heart rate with ineffective contractions of the lower chambers of the heart, called ventricles. The pumping efficiency of the heart is reduced by about 20% in the presence of AF alone. This explains the shortness of breath and fatigue that is often associated with AF.
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