System and method for evaluating the autonomic nervous system of a living subject
First Claim
1. A system for evaluating an autonomic nervous system of a living subject, comprising:
- a first pulse wave detection circuit that detects first pulse waves from a first portion of the living subject;
a second pulse wave detection circuit that detects second pulse waves from a second portion of the living subject;
a time-difference determining circuit that determines time differences between predetermined periodic points of the first pulse waves to predetermined periodic points of corresponding second pulse waves; and
a sympathetic nervous system evaluation circuit that determines an activity level of a sympathetic nervous system of the living subject based on frequency components present in fluctuations of the time differences determined by the time-difference determining circuit.
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Accused Products
Abstract
A system and method evaluates the autonomic nervous system of a living subject based on the high frequency components present in the fluctuations of the living subject'"'"'s pulse cycle and on the low frequency components present in the fluctuations of the living subject'"'"'s blood pressure. The autonomic nervous system evaluation system includes an electrocardiographic waveform determiner that detects an electrocardiographic waveform of the living subject. A pulse cycle determining circuit determines a pulse cycle of the living subject based on the electrocardiographic waveform. A blood pressure estimating circuit estimates the living subject'"'"'s blood pressure based on time differences between predetermined periodic points on the electrocardiographic waveform and predetermined periodic points on corresponding pulse waves. An autonomic nervous system evaluation circuit evaluates the autonomic nervous system of the living subject based on the frequency content of fluctuations present in the blood pressure and pulse cycle of the living subject.
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Citations
29 Claims
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1. A system for evaluating an autonomic nervous system of a living subject, comprising:
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a first pulse wave detection circuit that detects first pulse waves from a first portion of the living subject; a second pulse wave detection circuit that detects second pulse waves from a second portion of the living subject; a time-difference determining circuit that determines time differences between predetermined periodic points of the first pulse waves to predetermined periodic points of corresponding second pulse waves; and a sympathetic nervous system evaluation circuit that determines an activity level of a sympathetic nervous system of the living subject based on frequency components present in fluctuations of the time differences determined by the time-difference determining circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for evaluating an autonomic nervous system of a living subject, comprising:
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an electrocardiographic waveform detector that detects an electrocardiographic waveform of the living subject; a pulse wave detector that detects pulse waves of the living subject; a pulse cycle measuring circuit that measures a pulse cycle of the living subject; a time-difference determining circuit that determines time differences between predetermined periodic points of the electrocardiographic waveform of the living subject to predetermined periodic points of corresponding pulse waves of the living subject; a blood pressure estimating circuit that estimates a blood pressure of the living subject based on the time differences determined by the time-difference determining device; and an autonomic nervous system evaluation device that determines an activity level of a parasympathetic nervous system of the living subject based on frequency components present in fluctuations of the measured pulse cycle, and determines an activity level of a sympathetic nervous system of the living subject based on frequency components present in fluctuations of the estimated blood pressure. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification