Method of Assessing Blood Volume Using Photoelectric Plethysmography
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Abstract
A method and system for assessing blood volume within a subject includes generating a cardiovascular waveform representing physiological characteristics of a subject and determining blood volume of the subject by analyzing the cardiovascular waveform. The step of analyzing includes generating a first trace of the per heart-beat maximums of the cardiovascular waveform, which is representative of the systolic pressure upon the cardiovascular signal, generating a second trace of the per heart-beat minimums of the cardiovascular waveform, which is representative of the diastolic pressure upon the cardiovascular signal, and comparing the respective first trace and the second trace to generate an estimate of relative blood volume within the subject. In accordance with an alternate method of analyzing harmonic analysis is applied to the cardiovascular waveform, extracting a frequency signal created by ventilation and applying the extracted frequency signal in determining blood volume of the subject.
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Citations
93 Claims
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1-65. -65. (canceled)
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66. A method enabling detection of physiological changes in a subject, the method comprising:
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generating a cardiovascular waveform representing physiological characteristics of a subject; and analyzing the cardiovascular waveform, wherein the analyzing the cardiovascular waveform includes; identifying a first component of the cardiovascular waveform related to the amplitude of the cardiovascular waveform; and calculating an index responsive to changes in the first component of the cardiovascular waveform;
wherein index variations are reflective of physiological changes in the subject. - View Dependent Claims (67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78)
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79. A method for detecting physiological changes in a subject, the method comprising:
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generating a cardiovascular waveform representing physiological characteristics of a subject; and analyzing the cardiovascular waveform, wherein the analyzing the cardiovascular waveform includes; identifying a first component of the cardiovascular waveform; identifying a second component of the cardiovascular waveform; wherein one of the first and second components of the cardiovascular waveform is related to the amplitude of the cardiovascular waveform; comparing the first and second components of the cardiovascular waveform relative to one another; and calculating an index responsive to the changes in the comparison of the first and the second components of the cardiovascular waveform relative to one another;
whereby the index is also responsive to changes in the one of the first and second components related to the amplitude of the cardiovascular waveform, wherein index variations are reflective of physiological changes in the subject. - View Dependent Claims (80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93)
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Specification