METHOD AND SYSTEM FOR DETERMINING FLUID STATUS BASED ON A DYNAMIC IMPEDANCE SURROGATE FOR CENTRAL VENOUS PRESSURE
First Claim
1. A method for determining fluid status with a central venous system of a heart, the method comprising:
- collecting dynamic impedance (DI) data and static impedance (SI) data over multiple cardiac cycles (CC) for a persistent time period of interest (POI), the DI and SI data collected along a central venous (CV) vector that extends through a superior vena cava (SVC);
analyzing the DI and SI data, collected over the persistent time POI, to obtain DI long-term variation (LTV) information and SI LTV information, respectively;
detecting whether the DI LTV information and the SI LTV information include decreasing persistent trends in the DI and SI data; and
when decreasing persistent trends are detected in the DI and SI data, generating an overload output indicating that the heart is experiencing a volume overload state.
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Abstract
A method and system are provided for determining fluid status with a central venous system of a heart. Dynamic impedance (DI) data and static impedance (SI) data are collected over multiple cardiac cycles (CC) for a persistent time period of interest (POI). The DI and SI data are collected along a central venous (CV) vector that extends through a superior vena cava (SVC). The DI and SI data are analyzed to obtain DI long-term variation (LTV) information and SI LTV information, respectively, and to detect whether the DI LTV information and the SI LTV information include decreasing persistent trends in the DI and SI data. When decreasing persistent trends are detected in the DI and SI data, an overload output is generated to indicate that the heart is experiencing a volume overload state. The DI and SI data represent a surrogate for central venous pressure.
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Citations
22 Claims
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1. A method for determining fluid status with a central venous system of a heart, the method comprising:
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collecting dynamic impedance (DI) data and static impedance (SI) data over multiple cardiac cycles (CC) for a persistent time period of interest (POI), the DI and SI data collected along a central venous (CV) vector that extends through a superior vena cava (SVC); analyzing the DI and SI data, collected over the persistent time POI, to obtain DI long-term variation (LTV) information and SI LTV information, respectively; detecting whether the DI LTV information and the SI LTV information include decreasing persistent trends in the DI and SI data; and when decreasing persistent trends are detected in the DI and SI data, generating an overload output indicating that the heart is experiencing a volume overload state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for determining fluid status with a central venous system of a heart, the system comprising:
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inputs configured to receive dynamic impedance (DI) data and static impedance (SI) data that is collected over multiple cardiac cycles (CC) for a persistent time period of interest (POI), the DI and SI data collected along a central venous (CV) vector that extends through a superior vena cava (SVC); an impedance analysis (IA) module configured to analyze the DI and SI data, collected over the persistent time POI, to obtain DI long-term variation (LTV) information and SI LTV information, respectively; and a trend detection (TD) module configured to detect when the DI LTV information and the SI LTV information include decreasing persistent trends in the DI and SI data, the trend detection module configured to generate an overload output indicating that the heart is experiencing volume overload when the trend detection module detects the decreasing persistent trend in the DI and SI data. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification