Implantable cardiac stimulation device and method for optimizing sensing performance during rate adaptive bradycardia pacing
First Claim
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1. An implantable cardiac stimulation device including a ventricular defibrillator and a rate adaptive cardiac pacer comprising:
- pulse generating means for applying stimulation pulses to a patient'"'"'s heart at a variable stimulation rate that is a function of a sensed physiologic demand;
sensing means for sensing ventricular activity of the heart responsive to a plurality of sensing parameters including post-stimulation sensing parameters including an initial sensing threshold; and
adjusting means for adjusting the initial sensing threshold responsive to a calculated stimulation rate.
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Abstract
An implantable cardiac stimulation device including a ventricular defibrillator and a rate adaptive cardiac pacer automatically adjusts post-pacing sensing parameters dependent upon pacing rate. The device includes a pulse generator that applies stimulation pulses to a heart at a calculated variable stimulation rate as a function of physiologic demand. A sensing circuit senses ventricular activity of the heart responsive to a plurality of sensing parameters including post-pace sensing parameters and a processor adjusts the post-pace sensing parameters responsive to the selected pacing rate.
24 Citations
23 Claims
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1. An implantable cardiac stimulation device including a ventricular defibrillator and a rate adaptive cardiac pacer comprising:
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pulse generating means for applying stimulation pulses to a patient'"'"'s heart at a variable stimulation rate that is a function of a sensed physiologic demand;
sensing means for sensing ventricular activity of the heart responsive to a plurality of sensing parameters including post-stimulation sensing parameters including an initial sensing threshold; and
adjusting means for adjusting the initial sensing threshold responsive to a calculated stimulation rate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An implantable cardiac stimulation device including a ventricular defibrillator and a cardiac pacer comprising:
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a pulse generator that applies stimulation pulses to a heart at a variable stimulation rate;
a sensing circuit that senses ventricular activity of the heart responsive to a plurality of sensing parameters including post-stimulation sensing parameters;
a processor that adjusts the post-stimulation sensing parameters responsive to a calculated stimulation rate; and
wherein the sensing circuit has an initial sensing threshold, wherein the initial sensing threshold is one of the post-stimulation sensing parameters and wherein the processor adjusts the initial sensing threshold responsive to the calculated stimulation rate. - View Dependent Claims (8, 9, 10, 11, 12)
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13. In an implantable stimulation device including a ventricular defibrillator and a rate adaptive cardiac pacer, a method of applying stimulation pulses to a heart and sensing ventricular activity after applying a stimulation pulse including the steps of:
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applying stimulation pulses to a heart at a stimulation rate that varies as a function of physiologic demand;
sensing ventricular activity of the heart responsive to a plurality of sensing parameters including post-stimulation sensing parameters; and
adjusting one of the post-stimulation sensing parameters comprising an initial sensing threshold responsive to a calculated stimulation rate. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. An implantable cardiac stimulation device including a ventricular defibrillator and a rate adaptive cardiac pacer comprising:
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pulse generating means for applying stimulation pulses to a patient'"'"'s heart at a variable stimulation rate that is a function of a sensed physiologic demand;
sensing means for sensing ventricular activity of the heart responsive to a plurality of sensing parameters including post-stimulation sensing parameters including a decreasing sensing threshold which begins decreasing a delay time after application of a stimulation pulse; and
adjusting means for adjusting the delay time responsive to the calculated stimulation rate.
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22. An implantable cardiac stimulation device including a ventricular defibrillator and a cardiac pacer comprising:
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a pulse generator that applies stimulation pulses to a heart at a variable stimulation rate;
a sensing circuit that senses ventricular activity of the heart responsive to a plurality of sensing parameters including post-stimulation sensing parameters;
a processor that adjusts the post-stimulation sensing parameters responsive to a calculated stimulation rate; and
wherein the sensing circuit has a decreasing sensing threshold which begins decreasing a delay time after application of a stimulation pulse, wherein the delay time is one of the post-stimulation sensing parameters, and wherein the process adjusts the delay time responsive to the calculated stimulation rate.
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23. In an implantable stimulation device including a ventricular defibrillator and a rate adaptive cardiac pacer, a method of applying stimulation pulses to a heart and sensing ventricular activity after applying a stimulation pulse including the steps of:
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applying stimulation pulses to a heart at a stimulation rate that varies as a function of physiologic demand;
sensing ventricular activity of the heart by setting a sensing threshold and decreasing the sensing threshold a delay time after applying a stimulation pulse; and
adjusting the delay time responsive to a calculated stimulation rate.
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Specification