These findings support the hypothesis that enhanced basal endothelium-derived relaxing factor activity makes an important contribution to the low systemic vascular resistance in chronic severe anemia.

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SUMMARYThe development of atrial fibrillation in 2 patients, following an electrical shock is reported. One patient, with an underlying pre-excitation syndrome, had to be cardioverted due to rapid ventricular rate and hypotension. The other, with normal conduction, tolerated the arrhythmia well and atrial fibrillation reverted spontaneously after 24 hours.