Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Reexamination Certificate
2007-05-08
2007-05-08
Pezzuto, Robert E. (Department: 3766)
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
C607S017000
Reexamination Certificate
active
10751365
ABSTRACT:
A system and method for use in an implanted cardiac pacing device, whereby an optimal AV delay is determined at or near lower rate (pacing) limit (LRL) by determining measuring the variance, or instability, of the QT interval for a set of intervals. In one embodiment, asynchronous “LRL pacing” with a first programmed AV delay determines a measure of QT variance. The difference between the maximum QT and the minimum QT is expressed as QT difference (QTD). For each programmed AV delay the QT variance is again measured and the optimal AV delay produces minimum QTD. In another embodiment, AV delay is modulated around base values for a time. The difference between QT for the modulated AV and for the base AV (dQT) is measured at each base value, and the optimal AV delay corresponds to the smallest dQT.
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Oort Geeske Van
Wesselink Willem
Chapik Daniel G.
Heller Tammie K.
McDowall Paul H.
Medtronic Inc.
Pezzuto Robert E.
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