FLUID TITRATION SYSTEM
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Abstract
A fluid titration system has an optical sensor, a physiological monitor, a titration controller and an infusion device. The optical sensor transmits multiple wavelengths of light into a tissue site of a person and detects the optical radiation after attenuation by pulsatile blood flowing within the tissue site. The physiological monitor receives a resulting sensor signal and derives a plethysmograph that corresponds to the pulsatile blood flow. The monitor also calculates a plethysmograph variability measure that is responsive to changes in perfusion at the tissue site. A titration controller generates a fluid control output according to the variability measure. The infusion device administers a liquid solution via an intravenous (IV) connection to the person according to the fluid control output so as to regulate at least one of a fluid flow start, rate and stop.
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Citations
39 Claims
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1-19. -19. (canceled)
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20. A method of managing a blood volume of a patient, the method comprising:
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noninvasively detecting, with a detector of an optical sensor, light attenuated by tissue of the patient at a measurement site; outputting, with the optical sensor, a signal responsive to the light; determining, with one or more hardware processors, a first measure of variability from at least a ratio of a pulsatile component to a nonpulsatile component of the signal, the pulsatile component and the nonpulsatile component being indicative of a blood volume in the tissue, the pulsatile component being responsive to variable absorption and the nonpulsatile component being responsive to static absorption; determining, with the one or more hardware processors, that the first measure of variability indicates a need for the patient to receive a liquid solution; and in response to determining that the first measure of variability indicates the need, outputting a first infusion indication for presentation to a caregiver, the first infusion indication indicating to administer the liquid solution to the patient. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification