Method and apparatus for determining changes in heart failure status
First Claim
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1. A method for delivering pacing therapy to a heart failure patient, comprising:
- operating an implantable cardiac rhythm management device that generates sensing signals from sensed cardiac activity and delivering cardiac pacing therapy through one or more pacing channels to one or more heart chambers;
computing a clinical state vector as a combination of a plurality of parameters related to a patient'"'"'s heart failure status, wherein the plurality of parameters define an n-dimensional vector space with n being the number of parameters and with each parameter mapped to an ordinal scale that represents a coordinate axis in the n-dimensional vector space, and further wherein the n parameters include at least one parameter derived from a sense signal; and
,computing a difference vector between the computed clinical state vector and a previously computed state vector, wherein the magnitude of the difference vector indicates the extent of change in the patient'"'"'s heart failure status and the direction of the difference vector indicates whether the patient'"'"'s heart failure status is improving or worsening.
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Abstract
A method for operating a cardiac rhythm management device in which a clinical state vector is computed as a combination of a plurality of parameters related to a patient'"'"'s heart failure status and compared to a previously computed clinical state vector to determine a clinical trajectory indicative of changes in the patient'"'"'s heart failure status. Such detected changes in status can be used both as a clinical tool to evaluate treatment and to automatically adjust the operation of the device.
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29 Claims
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1. A method for delivering pacing therapy to a heart failure patient, comprising:
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operating an implantable cardiac rhythm management device that generates sensing signals from sensed cardiac activity and delivering cardiac pacing therapy through one or more pacing channels to one or more heart chambers; computing a clinical state vector as a combination of a plurality of parameters related to a patient'"'"'s heart failure status, wherein the plurality of parameters define an n-dimensional vector space with n being the number of parameters and with each parameter mapped to an ordinal scale that represents a coordinate axis in the n-dimensional vector space, and further wherein the n parameters include at least one parameter derived from a sense signal; and
,computing a difference vector between the computed clinical state vector and a previously computed state vector, wherein the magnitude of the difference vector indicates the extent of change in the patient'"'"'s heart failure status and the direction of the difference vector indicates whether the patient'"'"'s heart failure status is improving or worsening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A cardiac rhythm management device, comprising:
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one or more sensing channels for generating sense signals corresponding to cardiac depolarizations; a controller for controlling the delivery of paces to a pacing site in accordance with a programmed pacing mode, wherein the controller is further programmed to; compute a clinical state vector as a combination of a plurality of parameters related to a patient'"'"'s heart failure status, wherein the plurality of parameters define an n-dimensional vector space with n being the number of parameters and with each parameter mapped to an ordinal scale that represents a coordinate axis in the n-dimensional vector space, and further wherein the n parameters include at least one parameter derived from a sense signal; and
,compute a difference vector between the computed clinical state vector and a previously computed state vector, wherein the magnitude of the difference vector indicates the extent of change in the patient'"'"'s heart failure status and the direction of the difference vector indicates whether the patient'"'"'s heart failure status is improving or worsening. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification