CARDIAC CYCLE SYNCHRONIZED SAMPLING OF IMPEDANCE SIGNAL
First Claim
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1. A cardiac management system comprising:
- an implantable device, including;
an intrinsic cardiac signal sensor;
an impedance measurement circuit configured for generating a sampled transthoracic impedance signal; and
a processor, coupled to the intrinsic cardiac signal sensor and the impedance measurement circuit, the processor configured to;
initiate sampling of a transthoracic impedance signal in a timed relationship synchronized to instances of a fiducial marker in a sensed intrinsic cardiac signal, the sampling to remove a cardiac stroke component from the transthoracic impedance signal and to preserve a respiratory component of the transthoracic impedance signal.
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Abstract
A cardiac rhythm management device for obtaining transthoracic impedance. The device comprises a sensor for obtaining a signal indicative of an action of a heart, an impedance measurement circuit adapted to measure transthoracic impedance and a processor for utilizing the signal indicative of the action of the heart to sample the transthoracic impedance at sampling intervals commenced by fiducial markers in the signal indicative of the action of the heart, where the sampling of the impedance signal removes the component of a stroke volume of the heart from the signal and thereby provides lung ventilation information.
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Citations
26 Claims
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1. A cardiac management system comprising:
an implantable device, including;
an intrinsic cardiac signal sensor;
an impedance measurement circuit configured for generating a sampled transthoracic impedance signal; and
a processor, coupled to the intrinsic cardiac signal sensor and the impedance measurement circuit, the processor configured to;
initiate sampling of a transthoracic impedance signal in a timed relationship synchronized to instances of a fiducial marker in a sensed intrinsic cardiac signal, the sampling to remove a cardiac stroke component from the transthoracic impedance signal and to preserve a respiratory component of the transthoracic impedance signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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sensing an intrinsic cardiac signal;
generating a transthoracic impedance signal; and
sampling the transthoracic impedance signal in a timed relationship synchronized to instances of a fiducial marker in the sensed intrinsic cardiac signal, wherein the sampling removes a cardiac stroke component from the transthoracic impedance signal and preserves a respiratory component of the transthoracic impedance signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification