Maximize global contractility. SmartDelay™ AV delay optimization is fast and automatic, and recommends personalized sensed and paced AV delays to maximize each patient’s hemodynamic response to CRT.

Smart-AV Study 2010

Overall results showed SmartDelay was non-inferior to fixed AV and Echo. 

Smart-AV Study 2017

82% response rate achieved in patients with long RV-LV delay and SmartDelay™.

1014 patients evaluated at 3 and 6 months


No difference in improvement in left ventricular end-systolic volume at 6 months was observed between the SmartDelay and echocardiography arms (P=0.52) or the SmartDelay and fixed arms (P=0.66).1


419 patient SMART AV sub-study


  • With long RV-LV delay, SmartDelay resulted in a significant improvement in LVESV (-43.6 vs. -18.9)
  • 82% response rate or a 4-fold increase in response over fixed AV timing was  achieved in patients with long RV-LV delay who were programmed using SmartDelay2