Systems and methods for monitoring pulmonary edema dynamics
First Claim
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1. A system for use with a physiologic pressure sensor, the system comprising:
- a processor comprising;
a pressure sensor input configured to receive information indicative of a bodily pressure from the physiologic pressure sensor; and
an impedance sensor input configured to receive impedance information indicative of a pulmonary fluid level;
wherein the processor is configured to generate a pressure baseline using the information indicative of the bodily pressure received from the physiologic pressure sensor;
wherein the processor is configured to generate a pulmonary fluid level baseline using the impedance information indicative of the pulmonary fluid level;
wherein the processor is configured to identify a critical pressure (Pc) using the information indicative of the bodily pressure received from the physiologic pressure sensor and the received impedance information indicative of the pulmonary fluid level information, wherein the critical pressure (Pc) is the pressure at which the received impendence falls below the pulmonary fluid level baseline; and
wherein the processor is configured to compute a critical time (Tc) using the information indicative of the bodily pressure received from the physiologic pressure sensor and the received impedance information indicative of the pulmonary fluid level, wherein the critical time (Tc) defines a duration beginning when the information indicative of the bodily pressure deviates from the pressure baseline and ending when the pressure reaches the critical pressure (Pc).
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Abstract
This document discusses, among other things, systems and methods for measuring the dynamics of pulmonary congestion in heart failure subjects over time to monitor the subjects susceptibility to pulmonary edema, including sensing and receiving information indicative of a bodily pressure and information indicative of pulmonary fluid, and using the transient responses of these measurements to compute parameters related to the dynamics of thoracic fluid accumulation, such as a critical pressure (Pc), a critical time (Tc), or a filtration index (Kfi).
13 Citations
20 Claims
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1. A system for use with a physiologic pressure sensor, the system comprising:
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a processor comprising; a pressure sensor input configured to receive information indicative of a bodily pressure from the physiologic pressure sensor; and an impedance sensor input configured to receive impedance information indicative of a pulmonary fluid level; wherein the processor is configured to generate a pressure baseline using the information indicative of the bodily pressure received from the physiologic pressure sensor; wherein the processor is configured to generate a pulmonary fluid level baseline using the impedance information indicative of the pulmonary fluid level; wherein the processor is configured to identify a critical pressure (Pc) using the information indicative of the bodily pressure received from the physiologic pressure sensor and the received impedance information indicative of the pulmonary fluid level information, wherein the critical pressure (Pc) is the pressure at which the received impendence falls below the pulmonary fluid level baseline; and wherein the processor is configured to compute a critical time (Tc) using the information indicative of the bodily pressure received from the physiologic pressure sensor and the received impedance information indicative of the pulmonary fluid level, wherein the critical time (Tc) defines a duration beginning when the information indicative of the bodily pressure deviates from the pressure baseline and ending when the pressure reaches the critical pressure (Pc). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for use with a physiologic pressure sensor, the system comprising:
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a processor comprising; a pressure sensor input configured to receive information indicative of a bodily pressure from the physiologic pressure sensor; and an impedance sensor input configured to receive impedance information indicative of a pulmonary fluid level; wherein the processor is configured to generate a pressure baseline using the information indicative of the bodily pressure received from the physiologic pressure sensor; wherein the processor is configured to generate a pulmonary fluid level baseline using the impedance information indicative of the pulmonary fluid level; wherein the processor is configured to identify a critical pressure (Pc) using the information indicative of the bodily pressure received from the physiologic pressure sensor and the received impedance information indicative of the pulmonary fluid level information, wherein the critical pressure (Pc) is a pressure at which the received impedance information indicative of the pulmonary fluid level falls below the pulmonary fluid level baseline; and wherein the processor is configured to compute an estimated pressure slope (Pes) using the information indicative of the bodily pressure received from the physiologic pressure sensor, and wherein the processor is configured to compute an estimated critical time (Tec) using a current pressure determined using the information indicative of the bodily pressure received from the physiologic pressure sensor, the critical pressure (Pc), and the computed estimated pressure slope (Pes), and wherein the processor is configured to use the estimated critical time (Tec) to predict an impending patient event. - View Dependent Claims (17, 18, 19)
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20. A system for use with a physiologic pressure sensor, the system comprising:
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a processor comprising; a pressure sensor input configured to receive information indicative of a bodily pressure from the physiologic pressure sensor; and an impedance sensor input configured to receive impedance information indicative of a pulmonary fluid level; wherein the processor is configured to generate a pressure baseline using the information indicative of the bodily pressure received from the physiologic pressure sensor; wherein the processor is configured to generate a pulmonary fluid level baseline using the impedance information indicative of the pulmonary fluid level; wherein the processor is configured to identify a critical pressure (Pc) using the information indicative of the bodily pressure received from the physiologic pressure sensor and the received impedance information indicative of the pulmonary fluid level information, wherein the critical pressure (Pc) is a pressure at which the received impedance information indicative of the pulmonary fluid level falls below the pulmonary fluid level baseline; and wherein the processor is configured to compute a critical time (Tc) using the information indicative of the bodily pressure received from the physiologic pressure sensor and the received impedance information indicative of the pulmonary fluid level, wherein the critical time (Tc) defines a duration beginning when the information indicative of the bodily pressure deviates from the pressure baseline and ending when the pressure reaches the critical pressure (Pc); wherein the processor is configured to compute a filtration index (Kfi) as a function of a slope of the information indicative of the bodily pressure received from the physiologic pressure sensor leading up to or during a pulmonary fluid overload event and a slope of the impedance information indicative of the pulmonary fluid level leading up to or during the pulmonary fluid overload event, wherein the pulmonary fluid overload event includes at least one of a user-confirmed pulmonary fluid overload event or an automatically detected pulmonary fluid overload event, wherein the user-confirmed event includes at least one of a hospitalization or a change in medication, and wherein the automatically detected event includes at least one of information exceeding a threshold or a baseline, the information including at least one of a value or a slope.
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Specification