Surgery – Diagnostic testing – Cardiovascular
Patent
1997-06-03
1998-11-03
Kamm, William E.
Surgery
Diagnostic testing
Cardiovascular
600513, 600492, 600493, A61B 502
Patent
active
058301488
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.
REFERENCES:
patent: 4832038 (1989-05-01), Arai et al.
patent: 5131391 (1992-07-01), Sakai et al.
patent: 5299119 (1994-03-01), Kraf et al.
Inukai Hidekatsu
Sakai, deceased Hiroshi
Colin Corporation
Evanisko George R.
Kamm William E.
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