| Literature DB >> 23366717 |
Justin P Phillips1, Alla Belhaj, Kamran Shafqat, Richard M Langford, Kirk H Shelley, Panayiotis A Kyriacou.
Abstract
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.Entities:
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Year: 2012 PMID： 23366717 DOI： 10.1109/EMBC.2012.6346756
Source DB: PubMed Journal: Conf Proc IEEE Eng Med Biol Soc ISSN： 1557-170X