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Figure 1 Relationship between the pacing cycle length and atrial effective refractory periods (ERPs) measured in the high right atrium (HRA) (A) and distal coronary sinus (DCS) (B) in patients with atrial fibrillation (AF) and control subjects before and after intravenous infusion of dl-sotalol. Solid squares = control subjects at baseline; solid triangles = patients with AF at baseline; open squares = control subjects after dl-sotalol infusion; open triangles = patients with AF after dl-sotalol infusion.
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