Monitoring mayer wave effects based on a photoplethysmographic signal
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United States of America Patent
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Oct 19, 2004
Grant Date -
Aug 28, 2003
app pub date -
Feb 22, 2002
filing date -
Feb 22, 2002
priority date (Note) -
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Abstract
A photoplethysmographic instrument is used to obtain physiological parameter information related to low frequency heart rate and blood volume variability. In one implementation, a plethysmographic signal is filtered relative to a Mayer Wave frequency to provide an output related to low frequency blood volume variability. In another implementation, the photoplethysmographic signal is first processed to obtain a heart rate signal and the heart rate signal is in turn processed to obtain information regarding low frequency heart rate variability. In either case, a Mayer Wave effect having potential diagnostic significance can be monitored using a photoplethysmographic instrument such as a pulse oximeter.
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