Figure 1.

Representative action potential duration at 90% repolarization (APD90) and effective refractory period (ERP) of the left atrium in the 2K1C and sham-operated groups

APD90, action potential duration at 90% repolarization; ERP, effective refractory period

LA fibrosis was examined by Masson’s trichrome staining of tissue sections. At 4 months, the degree of LA fibrosis was markedly greater in the 2K1C group than in the sham-operated group (Fig. 2a). The mean percentage of fibrosis in sections from the 2K1C group was also greater than that observed in the sham-operated group (Fig. 2b; 16.96%±3.57% vs. 4.32%±1.98%; p=0.012).