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Figure 2 Atrial electrograms recorded before (A, B) and after sotalol infusion (C, D) using two basket electrodes in the RA and LA, respectively. Recordings at A4 and B4 of the RA and at B2, B3 and B4 of the LA were excluded from analysis because the atrial electrograms were too small. These areas might represent areas facing the mitral and tricuspid valve opening, and only ventricular electrograms were recorded. At baseline, the A-A intervals were shorter in the LA (157 ms) than in the RA (182 ms). Sotalol infusion caused a prolongation of the A-A intervals in both atria while the prolongation was larger in the RA (182 to 215 ms) than in the LA (157 to 174 ms). LA = left atrium; RA = right atrium.
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