FIGURE 4.

The ventricular pacing percentage (Vp%) over time using the VpS (Ventricular pace Suppression) algorithm and the IRSplus (Intrinsic Rhythm Support plus) algorithm. The pacemaker's atrioventricular delay was fixed at programmed intervals for the first 3 months. After that, the ventricular pacing minimization algorithm was introduced at 6 months (9 months) and 12 months (15 months). Upper and lower box lines denote 75th and 25th percentiles, and the median is displayed in horizontal lines within boxes. The whiskers denote 5%–95% percentiles, while the individual data points (circles, squares, and triangles) indicate outliers. (A) A trend of initial Vp% reduction with the VpS algorithm at 9 months, followed by a slight increase at 15 months. In contrast, (B), with the IRSplus algorithm, displays a more pronounced and stable reduction in Vp% at 9 months, which is maintained at 15 months. However, there were no statistical differences between the two groups (see text).