Table 3 shows an overall complete success rate of 96,5% in case of leads in the RV with the new Evolution R/L sheath, which is significantly higher (p=0.0354) compared to the old Evolution (76.7%). Also we observe an significant increase (p=0.0130) in complete success rate of the Pace/sense leads in favor of the R/L sheath (61.2% VS 89.6%).