System and method for characterizing circulatory blood flow
First Claim
1. A method for characterizing a circulatory blood flow, the method comprising:
- receiving, by a computing device, a biological signal emulating an arterial pulse wave from a sensor associated with a human body;
calculating, by the computing device, a fundamental frequency and a plurality of integer harmonics of a heart rate from the biological signal, wherein each of the fundamental frequency and the plurality of integer harmonics is characterized by a frequency amplitude;
calculating, by the computing device, at least one normalized parameter based on at least one pre-determined parameter baseline and at least one of the plurality of frequency amplitudes;
comparing, by the computing device, the at least one normalized parameter to a pre-determined threshold value;
characterizing the circulatory blood flow from the comparison of the at least one normalized parameter to the predetermined threshold value; and
providing an output of the characterization of the circulatory blood flow to a clinician monitoring the human body.
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Abstract
A computer-implemented method for characterizing circulatory blood volume is disclosed. The method has the steps of acquiring a biological signal that emulates the arterial pulse wave from a sensor. Two derived parameters, circulatory stress, which reflects a harmonic of heart rate, and circulatory blood flow, which reflects the amplitude of the unprocessed biological signal, are extrapolated from the biological signal, and are each compared to a threshold value and assessed to determine an adequacy of circulatory blood volume. In embodiments, the assessment of circulatory blood volume is used to manage a patient'"'"'s cardiovascular autoregulatory function or the adequacy of transfer of fluids to and from the circulatory system, with the ultimate goal of achieving a circulatory blood volume that adequately supplies the demands of the patient'"'"'s tissues and organs.
59 Citations
24 Claims
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1. A method for characterizing a circulatory blood flow, the method comprising:
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receiving, by a computing device, a biological signal emulating an arterial pulse wave from a sensor associated with a human body; calculating, by the computing device, a fundamental frequency and a plurality of integer harmonics of a heart rate from the biological signal, wherein each of the fundamental frequency and the plurality of integer harmonics is characterized by a frequency amplitude; calculating, by the computing device, at least one normalized parameter based on at least one pre-determined parameter baseline and at least one of the plurality of frequency amplitudes; comparing, by the computing device, the at least one normalized parameter to a pre-determined threshold value; characterizing the circulatory blood flow from the comparison of the at least one normalized parameter to the predetermined threshold value; and providing an output of the characterization of the circulatory blood flow to a clinician monitoring the human body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22, 24)
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20. A method for characterizing a circulatory blood flow in a human body in a response to a stress, the method comprising:
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calculating a measure of a steady-state circulatory blood volume by; receiving, by a computing device, a first biological signal emulating an arterial pulse wave from a sensor associated with the human body, calculating, by the computing device, a first fundamental frequency and a first plurality of integer harmonics of a heart rate from the first biological signal, wherein each of the first fundamental frequency and the first plurality of integer harmonics is characterized by a first frequency amplitude; calculating, by the computing device, at least one first normalized parameter based on at least one predetermined first parameter baseline and at least one of the first plurality of frequency amplitudes, and calculating the measure of the steady-state circulating blood flow based on the at least one first normalized parameter; applying at least one stress to the human body; calculating a measure of stressed circulatory blood flow by; receiving, by the computing device, a second biological signal emulating an arterial pulse wave from a sensor associated with the human body, calculating, by the computing device, a second fundamental frequency and a second plurality of integer harmonics of a heart rate from the second biological signal, wherein each of the second fundamental frequency and the second plurality of integer harmonics is characterized by a second frequency amplitude; calculating, by the computing device, at least one second normalized parameter based on at least one predetermined second parameter baseline and at least one of the second plurality of frequency amplitudes, and calculating the measure of stressed circulatory blood flow based on the at least one second normalized parameter; calculating a comparison of the measure of the steady-state circulatory blood flow to the measure of stressed circulatory blood flow; and providing an output of the comparison to a clinician monitoring the human body. - View Dependent Claims (21, 23)
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Specification