Deriving respiration from photoplethysmographic pulse width

A method for deriving respiration from the pulse photoplethysmographic (PPG) signal is presented. This method is based on the pulse width variability (PWV), and it exploits the respiratory information present in the pulse wave velocity and dispersion. It allows to estimate respiration signal from on...

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Bibliographic Details
Published in:Medical & biological engineering & computing 2013-02, Vol.51 (1-2), p.233-242
Main Authors: Lázaro, Jesús, Gil, Eduardo, Bailón, Raquel, Mincholé, Ana, Laguna, Pablo
Format: Article
Language:English
Subjects:
Adult
Analysis
Biomedical and Life Sciences
Biomedical Engineering and Bioengineering
Biomedicine
Biotechnology
Blood pressure
Computer Applications
Electrocardiography
Female
Human Physiology
Humans
Imaging
Male
Methods
Original Article
Oxygen saturation
Photoplethysmography - methods
Physiology
Pulse
Pulse oximetry
Radiology
Respiration
Respiratory system
Signal Processing, Computer-Assisted
Sleep apnea
Studies
Time Factors
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Summary:A method for deriving respiration from the pulse photoplethysmographic (PPG) signal is presented. This method is based on the pulse width variability (PWV), and it exploits the respiratory information present in the pulse wave velocity and dispersion. It allows to estimate respiration signal from only a pulse oximeter which is a cheap and comfortable sensor. Evaluation is performed over a database containing electrocardiogram (ECG), blood pressure (BP), PPG, and respiratory signals simultaneously recorded in 17 subjects during a tilt table test. Respiratory rate estimation error is computed obtaining of 1.27 ± 7.81 % (0.14 ± 14.78 mHz). For comparison purposes, we have also obtained a respiratory rate estimation from other known methods which involve ECG, BP, or also PPG signals. In addition, we have also combined respiratory information derived from different methods which involve only PPG signal, obtaining a respiratory rate error of −0.17 ± 6.67 % (−2.16 ± 12.69 mHz). The presented methods, PWV and combination of PPG derived respiration methods, avoid the need of ECG to derive respiration without degradation of the obtained estimates, so it is possible to have reliable respiration rate estimates from just the PPG signal.
ISSN:0140-0118
1741-0444
DOI:10.1007/s11517-012-0954-0