Adaptive sensing threshold for cross-chamber refractory period
First Claim
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1. A cardiac rhythm management device, comprising:
- first and second sensing channels for sensing electrical activity in a first heart chamber and a second heart chamber, respectively;
circuitry for detecting a first chamber sense when the sensed electrical activity in the first sensing channel exceeds a first channel sensing threshold which has a minimum level equal to a specified first channel steady-state value;
circuitry for detecting a second chamber sense when the sensed electrical activity in the second sensing channel exceeds a second channel sensing threshold which has a minimum level equal to a specified second channel steady-state value;
circuitry for measuring a peak amplitude of a post-sense far-field signal generated in the first sensing channel after a second chamber sense is detected; and
, circuitry for rendering the first sensing channel refractory for a post-sense cross-chamber refractory period after detection of a second chamber sense by raising the first channel sensing threshold above the first channel steady-state value, wherein the first channel sensing threshold is raised during the post-sense cross-chamber refractory period to a post-sense cross-chamber maximum refractory value derived from the measured peak amplitude of the post-sense far-field signal.
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Abstract
A cross-chamber refractory period with an adaptively adjusted sensing threshold for use by a cardiac pacemaker is disclosed. In response to a cross-chamber event, the sensing threshold of a sensing channel is raised to an adaptively adjusted cross-chamber maximum refractory value. The cross-chamber maximum refractory value is derived from a peak amplitude measurement of the far-field signal resulting from the cross-chamber event.
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Citations
36 Claims
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1. A cardiac rhythm management device, comprising:
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first and second sensing channels for sensing electrical activity in a first heart chamber and a second heart chamber, respectively;
circuitry for detecting a first chamber sense when the sensed electrical activity in the first sensing channel exceeds a first channel sensing threshold which has a minimum level equal to a specified first channel steady-state value;
circuitry for detecting a second chamber sense when the sensed electrical activity in the second sensing channel exceeds a second channel sensing threshold which has a minimum level equal to a specified second channel steady-state value;
circuitry for measuring a peak amplitude of a post-sense far-field signal generated in the first sensing channel after a second chamber sense is detected; and
,circuitry for rendering the first sensing channel refractory for a post-sense cross-chamber refractory period after detection of a second chamber sense by raising the first channel sensing threshold above the first channel steady-state value, wherein the first channel sensing threshold is raised during the post-sense cross-chamber refractory period to a post-sense cross-chamber maximum refractory value derived from the measured peak amplitude of the post-sense far-field signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A cardiac rhythm management device, comprising:
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first and second sensing channels for sensing electrical activity in a first heart chamber and a second heart chamber, respectively;
circuitry for detecting a first chamber sense when the sensed electrical activity in the first sensing channel exceeds a -first channel sensing threshold which has a minimum level equal to a specified first channel steady-state value;
circuitry for detecting a second chamber sense when the sensed electrical activity in the second sensing channel exceeds a second channel sensing threshold which has a minimum level equal to a specified second channel steady-state value;
circuitry for delivering paces to the second chamber;
circuitry for measuring the peak amplitude of a post-pace far-field signal generated in the first sensing channel upon delivery of a second chamber pace; and
circuitry for rendering the first sensing channel refractory for a post-pace cross-chamber refractory period after delivery of a second chamber pace by raising the first channel sensing threshold above the first channel steady-state value, wherein the first channel sensing threshold is raised during the post-pace cross-chamber refractory period to a post-pace cross-chamber maximum refractory value derived from the measured peak amplitude of the post-pace far-field signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for operating a cardiac rhythm management device, comprising:
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sensing electrical activity in a first heart chamber through a first sensing channel and generating a first chamber sense when the sensed electrical activity exceeds a first channel sensing threshold which has a minimum level equal to a specified first channel steady-state value;
sensing electrical activity in a second heart chamber through a second sensing channel and generating a second chamber sense when the sensed electrical activity exceeds a second channel sensing threshold which has a minimum level equal to a specified second channel steady-state value;
measuring a peak amplitude of a post-event far-field signal generated in the first sensing channel after a specified second chamber event occurs; and
,rendering the first sensing channel refractory for a cross-chamber post-event refractory period after occurrence of the second chamber event by raising the first channel sensing threshold above the first channel steady-state value, wherein the first channel sensing threshold is raised during the cross-chamber post-event refractory period to a maximum cross-chamber post-event refractory value derived from the measured peak amplitude of the post-event far-field signal. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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Specification