Self limited rate response
First Claim
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1. A method comprising:
- measuring an AV interval;
determining an averaged AV interval over a predetermined number of cardiac cycles; and
setting a minimum A-A interval equal to the averaged AV interval plus a predetermined constant; and
delivering cardiac pacing in a rate responsive, atrial based pacing mode;
comprising;
sensing a physiologic parameter other than the AV interval;
determining an atrial pacing rate based upon the sensed physiological parameter; and
employing the set minimum A-A interval as an upper limit to the determined atrial pacing rate.
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Abstract
Rate responsive pacing is limited in an atrial based pacing mode by the AV interval in order to avoid or minimize ventricular encroachment of atrial pacing. The AV or VA interval is used to permit rate responsiveness; modulate rate responsiveness or to determine a dynamic upper sensor rate.
107 Citations
20 Claims
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1. A method comprising:
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measuring an AV interval; determining an averaged AV interval over a predetermined number of cardiac cycles; and setting a minimum A-A interval equal to the averaged AV interval plus a predetermined constant; and delivering cardiac pacing in a rate responsive, atrial based pacing mode;
comprising;sensing a physiologic parameter other than the AV interval; determining an atrial pacing rate based upon the sensed physiological parameter; and employing the set minimum A-A interval as an upper limit to the determined atrial pacing rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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measuring an AV interval; determining an averaged AV interval over a predetermined number of cardiac cycles; setting a minimum A-A interval equal to the averaged AV interval plus a predetermined constant; delivering cardiac pacing in a rate responsive, atrial based pacing mode employing the set minimum A-A interval as an upper rate limit; analyzing the measured AV interval; determining if the measured AV interval is associated with a pattern; and excluding the measured AV interval from the averaged AV interval unless the measured AV interval is associated with the pattern wherein the measured AV interval is associated with the pattern if a duration of the measured AV interval varies by less than a predetermined amount from previously measured subset of AV intervals. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification