An elderly woman with severe anemia was hospitalized because of severe debility. On admission her electrocardiogram showed atrial fibrillation. After a transfusion of packed erythrocytes her rhythm converted to a normal sinus mechanism.
Buxbaum J, Furgerson W. Atrial Fibrillation in Severe Anemia. JAMA. 1970;212(11):1958–1959. doi:10.1001/jama.1970.03170240160025
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