Patent ID: 7215998
Filing Date: 2007-05-08
Classification: A61N

Abstract:
1. An implantable cardiac pacing system capable of delivering atrial pace signals at a determined pacing rate and synchronously generating ventricular pace signals at a determined AV delay following delivery of atrial pacing signals and including an AV delay optimizing subsystem, said AV delay optimizing subsystem comprising: test means for initiating a test to determine an optimal AV delay corresponding to a pacing rate at about a lower rate limit (LRL); rate means for setting a cardiac pacing rate at or near the LRL; AV delay means for varying a AV delay interval value to each one of a plurality of respective AV values and for maintaining the AV delay interval value at each said respective AV value for a time t; QT means operative during the time t of each maintained AV delay value for measuring variation of QT over said time t and for determining a QT differential (QTD) over said time t; and optimizing means for determining the optimal AV delay, wherein said optimal AV delay corresponds to a minimal QTD, and for programming said optimal AV delay as an operating AV delay.