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Figure 6 Relation between interatrial conduction delay and the cardiac hemodynamic variables. The maximal interatrial conduction delay (Max CD) was correlated with the improvements in the hemodynamic variables when pacing site was changed from HRA or CS pacing to BiA pacing. For S-A peak, A Vmax, CO, and TVI, r = 0.54 and r = 0.57, r = 0.58 and r = 0.56, r = 0.51 and r = 0.51, and r = 0.59 and r = 0.56, respectively. S-A peak (%) = (S-A peak [BiA] – S-A peak [HRA or CS]) / S-A peak (HRA or CS) x 100. A Vmax (%) = (A Vmax [BiA] – A Vmax [HRA or CS]) / A Vmax (HRA or CS) x 100. CO (%) = (CO [BiA] – CO [HRA or CS]) / CO (HRA or CS) x 100. TVI (%) = (TVI [BiA] – TVI [HRA or CS])/ TVI (HRA or CS) x 100. Other abbreviations as in Figure 2.