Medical device for assessing intravascular blood volume and technique for using the same
First Claim
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1. A method, comprising:
- using a processor;
receiving a plethysmographic waveform signal from a sensor, wherein the plethysmographic waveform signal is representative of a blood oxygen saturation of a patient;
receiving information related to a patient parameter that influences the plethysmographic waveform signal; and
determining a plethysmographic waveform variability based at least in part on the plethysmographic waveform signal; and
correcting the plethysmographic waveform variability to generate a corrected variability value based on the information related to the patient parameter, wherein the information related to the patient parameter comprises a tissue carbon dioxide level.
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Abstract
Embodiments of the present invention relate to a system and method for determining a physiologic parameter of a patient. Specifically, embodiments of the present invention include methods and systems for correcting a pulse oximetry plethysmographic waveform variability measurement based on parameters that may influence the waveform variability. The corrected measurement may be used to estimate intravascular blood volume and/or fluid responsiveness of a patient.
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18 Claims
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1. A method, comprising:
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using a processor; receiving a plethysmographic waveform signal from a sensor, wherein the plethysmographic waveform signal is representative of a blood oxygen saturation of a patient; receiving information related to a patient parameter that influences the plethysmographic waveform signal; and determining a plethysmographic waveform variability based at least in part on the plethysmographic waveform signal; and correcting the plethysmographic waveform variability to generate a corrected variability value based on the information related to the patient parameter, wherein the information related to the patient parameter comprises a tissue carbon dioxide level. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A monitor, comprising:
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an input circuit configured to receive a plethysmographic waveform signal and information relating to a patient parameter that influences the plethysmographic waveform signal; a memory storing an algorithm configured to calculate a corrected plethysmographic waveform variability based at least in part on the plethysmographic waveform signal and the information related to the patient parameter wherein the information relating to the patient parameter comprises information that the patient is undergoing positive end expiratory pressure ventilation, and wherein the algorithm is configured to increase the plethysmographic waveform variability based on the information; and an output circuit configured to provide an indication of the corrected plethysmographic waveform variability. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method, comprising:
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using a processor; receiving a plethysmographic waveform signal from a sensor, wherein the plethysmographic waveform signal is representative of a blood oxygen saturation of a patient; receiving information related to a patient parameter that influences the plethysmographic waveform signal; and determining a plethysmographic waveform variability based at least in part on the plethysmographic waveform signal; and correcting the plethysmographic waveform variability to generate a corrected variability value based on the information related to the patient parameter, wherein the information related to the patient parameter comprises a tissue water fraction. - View Dependent Claims (15, 16, 17, 18)
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Specification