Monitoring respiration based on plethysmographic heart rate signal
First Claim
1. A method for use in monitoring a patient, comprising the steps of:
- obtaining a photoplethysmographic (“
pleth”
) signal that is modulated based on interaction of a transmitted optical signal with a patient'"'"'s blood;
first processing said pleth signal to obtain heart rate information regarding a heart rate of said patient; and
second processing said heart rate information to obtain respiration information regarding respiration of said patient.
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Accused Products
Abstract
A pleth signal is analyzed to identify a heart rate variability parameter associated with respiration rate. In one embodiment, an associated process involves obtaining a photoplethysmograpic signal, processing the pleth signal to obtain heart rate samples, monitoring the heart rate sample to identify a heart rate variability associated with respiration, and determining a respiration rate based on the heart rate variability. The photoplethysmographic signal may be based on one or more channel signals of a conventional pulse oximeter. The invention thus allows for noninvasive monitoring of respiration rate and expands the functionality of pulse oximeters.
82 Citations
24 Claims
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1. A method for use in monitoring a patient, comprising the steps of:
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obtaining a photoplethysmographic (“
pleth”
) signal that is modulated based on interaction of a transmitted optical signal with a patient'"'"'s blood;
first processing said pleth signal to obtain heart rate information regarding a heart rate of said patient; and
second processing said heart rate information to obtain respiration information regarding respiration of said patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for use in monitoring a patient, comprising the steps of:
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obtaining a photoplethysmographic (“
pleth”
) signal that is modulated based on interaction of a transmitted optical signal with a patient'"'"'s blood;
processing said pleth signal using at least one filter so as to distinguish a signal component of interest having a frequency corresponding to a respiration rate of said patient from a potentially interfering signal component having a frequency between 0-0.5 Hz; and
providing an output indicative of said respiration rate of said patient based on said signal component of interest. - View Dependent Claims (16, 17, 18)
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19. An apparatus for use in monitoring a patient, comprising:
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a port for receiving a photoplethysmograph (“
pleth”
) signal that is modulated based on interaction of a transmitted optical signal with a patient'"'"'s blood; and
a processor operative for first processing said pleth signal to obtain heart rate information regarding a heart rate of said patient and second processing said heart rate information to obtain respiration information regarding respiration of said patient. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification