Method and apparatus for determining changes in heart failure status
First Claim
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1. A system, comprising:
- an implantable device having one or more sensing modalities;
an external programmer for the implantable device;
a telemetry interface enabling communication between the external programmer and the implantable device;
wherein the external programmer is 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 data transmitted by the implantable device; and
, wherein the external programmer is further programmed to 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.
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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.
96 Citations
20 Claims
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1. A system, comprising:
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an implantable device having one or more sensing modalities;
an external programmer for the implantable device;
a telemetry interface enabling communication between the external programmer and the implantable device;
wherein the external programmer is 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 data transmitted by the implantable device; and
,wherein the external programmer is further programmed to 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 (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An external programmer for an implantable medical device, comprising:
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means for 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 data transmitted by the implantable device; and
,means for 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 (17, 18, 19, 20)
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Specification