System and method for far-field R-wave detection
First Claim
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1. In an implantable cardiac stimulation device, a method comprising:
- sensing a plurality of ventricular events and atrial events;
calculating a plurality of ventricular-to-atrial interval values based on the sensed ventricular and atrial events;
processing the interval values to determine if the interval values are substantially constant; and
initiating a predetermined action if the interval values are substantially constant;
wherein initiating a predetermined action comprises preventing mode switching.
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Abstract
A system and corresponding method are disclosed for discriminating between far field R-waves and actual atrial events that are sensed on an atrial sense channel. In one embodiment, such information is used to prevent mode switching. In another embodiment, the information is used to extend an atrial blanking period so that the far field R-waves are no longer sensed on an atrial channel.
164 Citations
46 Claims
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1. In an implantable cardiac stimulation device, a method comprising:
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sensing a plurality of ventricular events and atrial events; calculating a plurality of ventricular-to-atrial interval values based on the sensed ventricular and atrial events; processing the interval values to determine if the interval values are substantially constant; and initiating a predetermined action if the interval values are substantially constant; wherein initiating a predetermined action comprises preventing mode switching.
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2. In an implantable cardiac stimulation device, a method comprising:
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sensing a plurality of ventricular events and atrial events; calculating a plurality of ventricular-to-atrial interval values based on the sensed ventricular and atrial events; processing the interval values to determine if the interval values are substantially constant; initiating a predetermined action if the interval values are substantially constant; and determining if the patient is at an increased activity level, and performing the acts of sensing, calculating, processing, and initiating only if the patient is at an increased activity level. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In an implantable cardiac stimulation device, a method comprising:
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sensing a plurality of ventricular events and subsequent atrial events; calculating interval values between the ventricular events and subsequent atrial events for a plurality of pairs of events; processing the interval values to determine if the interval values are substantially constant; extending an atrial blanking period if the interval values are substantially constant; and stopping an ongoing mode switch if the interval values are substantially constant. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. In an implantable cardiac stimulation device, a method comprising:
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sensing a plurality of ventricular events and subsequent atrial events; calculating interval values between the ventricular events and subsequent atrial events for a plurality of pairs of events; processing the interval values to determine if the interval values are substantially constant; and extending an atrial blanking period if the interval values are substantially constant; and determining if the patient is at an increased activity level, and performing the acts of sensing, calculating, processing, and extending only if the patient is at an increased activity level.
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25. In an implantable cardiac stimulation device, a method comprising:
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sensing a plurality of ventricular events and subsequent atrial events; calculating interval values between the ventricular events and subsequent atrial events for a plurality of pairs of events; processing the interval values to determine if the interval values are substantially constant; and preventing mode switching if the interval values are substantially constant. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An implantable cardiac stimulation device comprising:
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sensing circuitry that is operative to sense a plurality of ventricular events and subsequent atrial events; and control circuitry that is operative to calculate interval values, between a ventricular event and a subsequent atrial event, for a plurality of pairs of events, to compare the plurality of interval values to determine if the interval values are substantially stable, and to take predetermined action if a stable interval exists; wherein the control circuitry is operative to determine if the patient is at an increased activity level, and is responsive to the patient not being at the increased activity level to ignore the interval values. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44)
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45. An implantable cardiac stimulation device comprising:
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sensing circuitry that is operative to sense a plurality of ventricular events and subsequent atrial events; and control circuitry that is operative to calculate interval values, between a ventricular event and a subsequent atrial event, for a plurality of pairs of events, to compare the plurality of interval values to determine if the interval values are substantially stable, and to take predetermined action if a stable interval exists; wherein the control circuitry is operative to prevent mode switching if far-field sensing exists.
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46. An implantable cardiac device comprising:
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means for sensing ventricular and atrial events; means for calculating a plurality of ventricular-to-atrial interval values; means for ignoring the interval values if the patient is not at an increased activity level; means for determining if the interval values are substantially constant; and means for initiating a predetermined action if the interval values are substantially constant.
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Specification