System and method for detecting fluid responsiveness of a patient
First Claim
1. A medical monitor for determining a fluid responsiveness index of a subject, the monitor comprising:
- an electrical input to receive a physiological signal from a sensor;
a processor configured to;
determine a value indicative of fluid responsiveness based on modulations of the physiological signal;
determine a value indicative of changes in vascular tone of the subject based on one or more metrics of the physiological signal; and
determine a fluid responsiveness index of the subject based on the value indicative of fluid responsiveness and the value indicative of changes in vascular tone.
2 Assignments
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Accused Products
Abstract
A system is configured to determine a fluid responsiveness index of a patient from a physiological signal. The system may include a sensor configured to be secured to an anatomical portion of the patient, and a monitor operatively connected to the sensor. The sensor is configured to sense a physiological characteristic of the patient. The monitor is configured to receive a physiological signal from the sensor. The monitor may include an index-determining module configured to determine the fluid responsiveness index through formation of a ratio of one or both of amplitude or frequency modulation of the physiological signal to baseline modulation of the physiological signal.
137 Citations
21 Claims
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1. A medical monitor for determining a fluid responsiveness index of a subject, the monitor comprising:
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an electrical input to receive a physiological signal from a sensor; a processor configured to; determine a value indicative of fluid responsiveness based on modulations of the physiological signal; determine a value indicative of changes in vascular tone of the subject based on one or more metrics of the physiological signal; and determine a fluid responsiveness index of the subject based on the value indicative of fluid responsiveness and the value indicative of changes in vascular tone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining a fluid responsiveness index of a subject from a physiological signal, the method comprising:
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receiving a photoplethysmograph (PPG) signal from a pulse oximetry sensor at a pulse oximetry monitor; determining, using the pulse oximetry monitor, a fluid responsiveness value based on the PPG signal; determining, using the pulse oximetry monitor, a value indicative of changes in vascular tone of the subject based on the PPG signal; and determining, using the pulse oximetry monitor, a fluid responsiveness index of the subject based on the fluid responsiveness value and the value indicative of changes in vascular tone of the subject. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A tangible and non-transitory computer readable medium that includes one or more sets of instructions configured to direct a computer to:
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receive a photoplethysmograph (PPG) signal from a pulse oximetry sensor secured to a subject; determine a fluid responsiveness value based on the PPG signal; determine a value indicative of changes in vascular tone of the subject based on the PPG signal; and determine a fluid responsiveness index of the subject based on the fluid responsiveness value and the value indicative of changes in vascular tone of the subject. - View Dependent Claims (20, 21)
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Specification