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Modulation of finger photoplethysmographic traces during forced respiration: venous blood in motion?

Phillips, J. P., Belhaj, A., Shafqat, K. , Langford, R. M., Shelley, K. H. & Kyriacou, P. A. (2012). Modulation of finger photoplethysmographic traces during forced respiration: venous blood in motion?. 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), pp. 3644-3647. doi: 10.1109/EMBC.2012.6346756


Photoplethysmographic (PPG) signals were recorded from the fingers of 10 healthy volunteers during forced respiratory inspiration. The aim of this pilot study was to assess the effect of negative airway pressure on the blood volumes within the tissue bed of the finger, and the resultant modulation of PPG signals. The acquired signals were analysed and oxygen saturations estimated from the frequency spectra in the cardiac and respiratory frequency ranges. Assuming that respiratory modulation affects blood volumes in veins to a greater extent than in arteries, the local venous oxygen saturation was estimated. Estimated venous oxygen saturation was found to be 3.1% (±4.2%) lower than the estimated arterial saturation.

Publication Type: Article
Additional Information: © 2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Subjects: R Medicine > R Medicine (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Science & Technology > Engineering
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