System and method for evaluating heart failure based on ventricular end-diastolic volume using an implantable medical device
First Claim
1. A system for evaluating progression of heart failure within a patient using an implantable medical device, comprising:
- a ventricular end-diastolic volume (EDV) detection unit for detecting values representative of ventricular EDV;
wherein the system is coupled to at least two electrodes configured for implant within the patient'"'"'s ventricles and wherein the EDV detection unit is adapted to;
(i.) identify a baseline point in time within each of a plurality of cardiac cycles for detecting the values representative of ventricular EDV, wherein the baseline point in time within each of the plurality of cardiac cycles is identified by tracking a pre-ejection interval and then selecting a point in time within the pre-ejection interval;
(ii.) detect a signal representative of an impedance between the two ventricular electrodes at each baseline point in time; and
(iii.) determine a baseline ventricular EDV value based on the impedance signal detected at each baseline point in time; and
wherein the system further comprises a ventricular EDV-based heart failure evaluation unit operative to detect progression of heart failure within the patient based on detecting changes, if any, over time in the baseline ventricular EDV values.
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Abstract
Briefly, values representative of ventricular end-diastolic volume (EDV) are detected using ventricular electrodes and then heart failure, if occurring within the patient, is evaluated based on ventricular EDV. In this manner, ventricular EDV is used as a proxy for ventricular end-diastolic pressure. By using ventricular EDV instead of ventricular end-diastolic pressure, heart failure is detected and evaluated without requiring sophisticated sensors or complex algorithms. Instead, ventricular EDV is easily and reliably measured using impedance signals sensed by implanted ventricular pacing/sensing electrodes. The severity of heart failure is also evaluated based on ventricular EDV values and heart failure progression is tracked based on changes, if any, in ventricular EDV values over time.
40 Citations
26 Claims
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1. A system for evaluating progression of heart failure within a patient using an implantable medical device, comprising:
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a ventricular end-diastolic volume (EDV) detection unit for detecting values representative of ventricular EDV; wherein the system is coupled to at least two electrodes configured for implant within the patient'"'"'s ventricles and wherein the EDV detection unit is adapted to; (i.) identify a baseline point in time within each of a plurality of cardiac cycles for detecting the values representative of ventricular EDV, wherein the baseline point in time within each of the plurality of cardiac cycles is identified by tracking a pre-ejection interval and then selecting a point in time within the pre-ejection interval; (ii.) detect a signal representative of an impedance between the two ventricular electrodes at each baseline point in time; and (iii.) determine a baseline ventricular EDV value based on the impedance signal detected at each baseline point in time; and wherein the system further comprises a ventricular EDV-based heart failure evaluation unit operative to detect progression of heart failure within the patient based on detecting changes, if any, over time in the baseline ventricular EDV 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)
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23. A system for tracking progression of heart failure within a patient using an implantable medical device, comprising:
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means for determining ventricular end-diastolic volume (EDV) values; wherein the means for determining ventricular EDV values is coupled to at least two electrodes configured for implant within the patient'"'"'s ventricles and comprises; (i.) means for identifying a baseline point in time within each of a plurality of cardiac cycles for detecting the ventricular EDV values, wherein the baseline point in time within each of the plurality of cardiac cycles is identified by tracking a pre-ejection interval and then selecting a point in time within the pre-ejection interval; (ii.) means for detecting a signal representative of an impedance between the at least two ventricular electrodes at each baseline point in time; and (iii.) means for determining a baseline ventricular EDV values based on the impedance signal detected at each baseline point in time; and wherein the system further comprises means for tracking progression of heart failure, if any, within the patient based on detecting changes, if any, over time in the baseline ventricular EDV values. - View Dependent Claims (24, 25, 26)
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Specification