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Photoplethysmographic measurements from the esophagus using a new fiber-optic reflectance sensor

Phillips, J. P., Langford, R. M., Chang, S. H. , Kyriacou, P. A. & Jones, D. P. (2011). Photoplethysmographic measurements from the esophagus using a new fiber-optic reflectance sensor. Journal of Biomedical Optics (JBO), 16(7), 77005. doi: 10.1117/1.3598858


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.

Publication Type: Article
Additional Information: Copyright 2011 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Publisher Keywords: pulse oximetry; esophagus; fiberoptic; photoplethysmography; oxygen saturation
Subjects: R Medicine > RE Ophthalmology
Departments: School of Science & Technology > Engineering
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