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US 9,066,659 B2Granted
Transient sensor response to posture as a measure of patient status
AssigneeCardiac Pacemakers, Inc.
InventorsPramodsingh Hirasingh Thakur, Abhilash Patangay, John D. Hatlestad, Kenneth C. Beck
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Abstract
Patient posture information can be received, such as to indicate a change in patient posture by at least a threshold amount. A transient response signal indicative of a change in a physiological parameter can be received at multiple instances near a change in patient posture. Waveform morphology features can be extracted from a transient response signal and used to provide an indication of a cardiac status, such as a heart failure status.
Claims20
An apparatus, comprising:
- a processor circuit, including:
- a first data input configured to receive information indicative of a change in posture status;
- a second data input configured to receive, at multiple instances temporally near or at the change in posture status, a transient response signal of a physiological parameter in response to the change in posture status, the transient response signal representing temporal variation of the physiological parameter occurring during the change in posture status;
- and
- a processor-readable medium, including instructions that, when performed by the processor circuit, configure the apparatus to:
- extract a waveform morphology feature from the transient response signal, the waveform morphology feature occurring during the change in posture status;
- provide an indication of a cardiac status using the extracted waveform morphology feature;
- and
- display the indication in an output device;
- and
- a therapy delivery circuit configured to deliver a therapy based at least on the indication of the cardiac status.
8 more elements
A method for operating an apparatus, the method comprising, by the apparatus:
- receiving information indicative of a change in posture status;
- receiving, at multiple instances temporally near or at the change in posture status, a transient response signal of a physiological parameter in response to the change in posture status the transient response signal representing temporal variation of the physiological parameter occurring during the change in posture status;
- extracting a waveform morphology feature from the transient response signal, the waveform morphology feature occurring during the change in posture status;
- providing an indication of a cardiac status using the extracted waveform morphology feature;
- displaying the indication in an output device;
- and
- delivering a therapy based at least on the indication of the cardiac status.
4 more elements
An apparatus, comprising:
- a processor circuit, including:
- a first data input configured to receive information indicative of a change in posture status;
- a second data input configured to receive, at multiple instances temporally near or at the change in posture status, a transient response signal of a physiological parameter in response to the change in posture status, the transient response signal representing temporal variation of the physiological parameter occurring during the change in posture status;
- and
- a processor-readable medium, including instructions that, when performed by the processor circuit, configure the apparatus to:
- model the transient response signal representing the temporal variation of the physiological parameter during the change in posture status as a first or second order system response signal occurring during the change in posture status;
- extract a characteristic parameter of the modeled first or second order system signal, the characteristic parameter including at least one of a delay duration, a decay duration, a natural frequency of oscillation, or a magnitude change, of a portion of the system response signal that includes the temporal variation of the physiological parameter during the change in posture status;
- provide, using the extracted characteristics parameter, an indication of worsening heart failure;
- and
- display the indication in an output device;
- and
- a therapy delivery circuit configured to deliver a therapy based at least on the indication of the cardiac status.
9 more elements
Dependencies are inferred from the claim text.