Monitoring mayer wave effects based on a photoplethysmographic signal
First Claim
1. A method for use in monitoring a patient, comprising the steps of:
- configuring a photoplethysmographic (“
pleth”
) instrument relative to a patient for a pleth analysis;
causing a respiration rate of said patient to be at least at a given threshold, wherein a frequency of said respiration rate is elevated above a frequency range associated with a Mayer Wave;
first operating said pleth instrument to obtain a pleth signal for said patient; and
second operating said pleth instrument to process said pleth signal for identifying an effect related to said Mayer Wave and providing an output related to said Mayer Wave effect.
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Accused Products
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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Citations
8 Claims
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1. A method for use in monitoring a patient, comprising the steps of:
-
configuring a photoplethysmographic (“
pleth”
) instrument relative to a patient for a pleth analysis;
causing a respiration rate of said patient to be at least at a given threshold, wherein a frequency of said respiration rate is elevated above a frequency range associated with a Mayer Wave;
first operating said pleth instrument to obtain a pleth signal for said patient; and
second operating said pleth instrument to process said pleth signal for identifying an effect related to said Mayer Wave and providing an output related to said Mayer Wave effect. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification