AV-Optimization using Electrical Cardiometry (EC)

Friday, June 16, 2006

B. Ismer, T. Körber,W.Voss et al. (Cardiology Division at the University Hospital Rostock)

Individual AV delay optimization is essential in the followup of biventricular paced congestive heart failure patients and should be performed in bradycardia pacing, too. It requires easy to use and time saving methods.

Electrical velocimetry is a noninvasive method to measure changes in thoracic electrical conductivity in order to determine hemodynamic parameters. Therefore, it could be utilized to perform a serial AV delay optimization in DDD pacemaker patients. In contrast to common impedance cardiography, results of electrical velocimetry are based on a new algorithm interpreting blood conductivity changings by changing orientation of moving erythrocytes.


  • The study demonstrates good correlation between results of individual AV delay optimization by electrical velocimetry and by echo.
  • Thus, electrical velocimetry can be utilized as a valid serial method to routinely individualize AV delay in DDD pacing for both, congestive heart failure and AV block.
  • Generally, serial AVD optimization can always be reduced to either VDD or DDD mode if the individual pacemaker-related interatrial conduction intervals are known.