System and method for detecting pulmonary congestion based on stroke volume using an implantable medical device
First Claim
1. A method for use with an implantable medical device for implant within a patient, the method comprising:
- detecting values representative of right ventricular (RV) stroke volume within the patient using at least one of a sensor and electrodes;
detecting values representative of left ventricular (LV) stroke volume within the patient using at least one of the sensor and electrodes;
evaluating differences, utilizing one or more microcontrollers, between the RV stroke volume values and the LV stroke volume values wherein the evaluating differences include calculating an accumulated difference between the RV stroke volume values and the LV stroke volume values; and
detecting, utilizing the one or more microcontrollers, an indication of pulmonary congestion based on a comparison between an accumulation threshold and the accumulated difference between the RV stroke volume values and the LV stroke volume values.
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Accused Products
Abstract
Techniques are provided for detecting pulmonary congestion based on an increase in right ventricular (RV) stroke volume over left ventricular (LV) stroke volume. In one example, the device generates an index based on accumulated differences between RV stroke volume and LV stroke volume while RV stroke volume exceeds LV stroke volume, such that the index is indicative of an ongoing imbalance between RV and LV stroke volume. The index is compared to a suitable threshold to detect a severe imbalance indicative of pulmonary edema. Additionally, techniques are described for estimating RV and LV stroke volumes based on pulmonary artery pressure, left atrial pressure, aortic pressure, LV strain or on various intracardiac or extracardiac impedance measurements.
78 Citations
26 Claims
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1. A method for use with an implantable medical device for implant within a patient, the method comprising:
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detecting values representative of right ventricular (RV) stroke volume within the patient using at least one of a sensor and electrodes; detecting values representative of left ventricular (LV) stroke volume within the patient using at least one of the sensor and electrodes; evaluating differences, utilizing one or more microcontrollers, between the RV stroke volume values and the LV stroke volume values wherein the evaluating differences include calculating an accumulated difference between the RV stroke volume values and the LV stroke volume values; and detecting, utilizing the one or more microcontrollers, an indication of pulmonary congestion based on a comparison between an accumulation threshold and the accumulated difference between the RV stroke volume values and the LV stroke volume values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system for use with an implantable medical device for implant within a patient, the system comprising:
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a right ventricular (RV) stroke volume detector comprising at least one of a sensor and electrodes operative to detect values representative of RV stroke volume within the patient; a left ventricular (LV) stroke volume detector comprising at least one of the sensor and electrodes operative to detect values representative of LV stroke volume within the patient; an RV/LV stroke volume difference evaluation system operative to calculate an accumulated difference between the RV stroke volume values and the LV stroke volume values; and a pulmonary congestion indicator system operative to detect an indication of pulmonary congestion based on a comparison between an accumulation threshold and the accumulated difference between the RV stroke volume values and the LV stroke volume values.
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26. A system for use with an implantable medical device for implant within a patient, the system comprising:
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means for detecting values representative of right ventricular (RV) stroke volume within the patient, the means for detecting comprising at least one of a sensor and electrodes; means for detecting values representative of left ventricular (LV) stroke volume within the patient, the means for detecting comprising at least one of the sensor and electrodes; means for calculating an accumulated difference between the RV stroke volume values and the LV stroke volume values; and means for detecting an indication of pulmonary congestion based on a comparison between an accumulation threshold and the accumulated difference between the RV stroke volume values and the LV stroke volume values.
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Specification