Evoked response sensing for ischemia detection
First Claim
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1. A method for operating a cardiac pacemaker, comprising:
- sensing intrinsic cardiac activity in one or more cardiac chambers from a sensing channel;
delivering paces to a cardiac chamber in accordance with a programmed pacing mode;
recording an evoked response electrogram from the sensing channel when a pace is delivered;
storing a representation of a previously recorded reference evoked response electrogram that indicates any baseline current of injury;
looking for an increased current of injury by cross-correlating the recorded electrogram with the reference electrogram in order to detect a change indicative of ischemia; and
,adjusting one or more pacing parameters that reduce the extent of pacing if a change indicative of cardiac ischemia is detected.
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Abstract
A cardiac pacemaker in which an electrogram is recorded from an evoked response sensing channel in order to detect changes indicative of cardiac ischemia. If such changes are detected, the maximum allowable pacing rate can be decreased for those pacing modes that allow the pacing rate to change with metabolic demand.
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11 Claims
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1. A method for operating a cardiac pacemaker, comprising:
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sensing intrinsic cardiac activity in one or more cardiac chambers from a sensing channel; delivering paces to a cardiac chamber in accordance with a programmed pacing mode; recording an evoked response electrogram from the sensing channel when a pace is delivered; storing a representation of a previously recorded reference evoked response electrogram that indicates any baseline current of injury; looking for an increased current of injury by cross-correlating the recorded electrogram with the reference electrogram in order to detect a change indicative of ischemia; and
,adjusting one or more pacing parameters that reduce the extent of pacing if a change indicative of cardiac ischemia is detected. - View Dependent Claims (2, 3, 4, 5, 9)
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6. A cardiac pacemaker, comprising:
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a sensing channel for sensing intrinsic cardiac activity and for sensing an evoked response to a pace; a pacing channel for pacing a cardiac chamber; a controller for delivering paces to the cardiac chamber in accordance with a programmed pacing mode wherein the controller is programmed to record an evoked response electrogram from the sensing channel when a pace is delivered; wherein the controller is programmed to store a representation of a previously recorded reference evoked response electrogram that indicates any baseline current of injury; wherein the controller is programmed to look for an increased current of injury by cross-correlating the recorded electrogram with the reference electrogram in order to detect a change indicative of cardiac ischemia; and
,wherein the controller is programmed to adjust one or more pacing parameters that reduce the extent of pacing if a change indicative of cardiac ischemia is detected. - View Dependent Claims (7, 8, 10, 11)
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Specification