Rate responsive pacemaker and pacing method
First Claim
1. Method for pacing along a decay curve having a decay time constant, the pacing method comprising the steps of:
- a. selecting a set of predetermined achievement criteria;
b. selecting a first pacing switch rate threshold;
c. determining whether said achievement criteria have been met; and
d. if said achievement criteria have been met, then modifying the decay time constant of the decay curve from a first value to a second value, as the pacing rate drops below said first pacing switch rate threshold, such that said second value is different from said first value.
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Abstract
A rate responsive pacemaker and a pacing method for optimizing the pacing decay curve after a period of increased activity. The pacing method includes the steps of selecting a set of predetermined achievement criteria such as an achievement rate and an achievement time interval. The achievement rate is selected between an upper pacing rate and a first pacing switch rate threshold. The pacing method then determines whether the achievement criterion has been met. If the achievement criterion has been met, then the decay time constant of the decay curve changes from a first value to a second value, as the pacing rate drops below the first pacing switch rate threshold. A second pacing switch rate threshold lower than the first pacing switch rate threshold is then selected, and, if the achievement criteria have been met, then the decay time constant of the decay curve is modified from the second value to a third value, as the pacing rate drops below the second pacing switch rate threshold.
29 Citations
16 Claims
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1. Method for pacing along a decay curve having a decay time constant, the pacing method comprising the steps of:
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a. selecting a set of predetermined achievement criteria; b. selecting a first pacing switch rate threshold; c. determining whether said achievement criteria have been met; and d. if said achievement criteria have been met, then modifying the decay time constant of the decay curve from a first value to a second value, as the pacing rate drops below said first pacing switch rate threshold, such that said second value is different from said first value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A cardiac pacemaker of the type having a pulse generator for generating stimulus pulses, comprising:
- means for pacing along a decay curve having a decay time constant, comprising;
i) means for selecting a set of predetermined achievement criterion; ii) means for selecting a first pacing switch rate threshold; iii) means for determining whether said achievement criterion has been met; and iv) means for modifying the decay time constant of the decay curve from a first value to a second value, as the pacing rate drops below said first pacing switch rate threshold, such that said second value is different from said first value, if said achievement criterion has been met. - View Dependent Claims (16)
- means for pacing along a decay curve having a decay time constant, comprising;
Specification