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Journal of Biomedical Optics

Photoplethysmographic measurements from the esophagus using a new fiber-optic reflectance sensor
Author(s): Justin P. Phillips; Panayiotis A. Kyriacou; Deric P. Jones; Richard M. Langford; Serene H. Chang
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Paper Abstract

A prototype fiber-optic reflectance-mode pulse oximetry sensor and measurement system is developed for the purposes of estimating arterial oxygen saturation in the esophagus. A dedicated probe containing miniature right-angled glass prisms coupled to light sources and a photodetector by means of optical fibers is designed and used to record photoplethysmographic (PPG) signals from the esophageal epithelium in anesthetized patients. The probe is inserted simply by an anesthesiologist in all cases, and signals are recorded successfully in all but one of 20 subjects, demonstrating that esophageal PPG signals can be reliably obtained. The mean value of the oxygen saturation recorded from the esophagus for all subjects is 94.0 ± 4.0%. These results demonstrate that SpO2 may be estimated in the esophagus using a fiber-optic probe.

Paper Details

Date Published: 1 July 2011
PDF: 10 pages
J. Biomed. Opt. 16(7) 077005 doi: 10.1117/1.3598858
Published in: Journal of Biomedical Optics Volume 16, Issue 7
Show Author Affiliations
Justin P. Phillips, The City Univ. (United Kingdom)
Panayiotis A. Kyriacou, The City Univ. (United Kingdom)
Deric P. Jones, The City Univ. (United Kingdom)
Richard M. Langford, St. Bartholomew's Hospital (United Kingdom)
Serene H. Chang, St. Bartholomew's Hospital (United Kingdom)

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