Method and apparatus for continuous pulse contour cardiac output
First Claim
1. A method, comprising:
- sensing a cardiac electrogram (EGM) signal of the heart;
sensing a right ventricular pressure (RVP) signal;
computing an estimated stroke volume using the sensed EGM signal and the sensed RVP signal.
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Accused Products
Abstract
A system and method are provided for sensing cardiac electrogram (EGM) signals and ventricular pressure signals and for using the sensed EGM and sensed pressure signals for estimating stroke volume (SV). A measure of cardiac output can be computed from the estimated SV and a heart rate determined from the EGM signals. The sensed ventricular pressure signal and the sensed EGM signal are used to derive landmark points such as an estimated pulmonary diastolic pressure, a mean pulmonary artery pressure, a peak right ventricular pressure (RVP), and various time intervals used in computing an area or a pulse contour integral. The pulse contour integral is used to estimate SV. The estimated pulmonary diastolic pressure, mean pulmonary artery pressure and CO computed from the estimated SV can be used to compute a pulmonary vascular resistance.
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Citations
21 Claims
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1. A method, comprising:
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sensing a cardiac electrogram (EGM) signal of the heart;
sensing a right ventricular pressure (RVP) signal;
computing an estimated stroke volume using the sensed EGM signal and the sensed RVP signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for monitoring the hemodynamic status of a patient, comprising:
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sensing a cardiac electrogram (EGM) signal of the heart;
sensing a right ventricular pressure (RVP) signal;
computing an estimated stroke volume using the sensed EGM signal and the sensed RVP signal;
deriving a mean pulmonary artery pressure using the RVP signal and the EGM signal; and
deriving an estimated pulmonary artery diastolic pressure using the right ventricular pressure signal and the EGM signal. - View Dependent Claims (18, 19, 20)
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21. A system for monitoring a patient, comprising:
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a sensor adapted for implanting in a ventricle of a heart to measure pressure;
a circuit to measure cardiac electrogram (EGM) signals; and
a processing circuit coupled to receive signals indicative of the ventricular pressure and the EGM signals and to determine there from an estimated stroke volume.
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Specification