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Design and evaluation of a new electro-optical system for monitoring oesophageal photoplethysmographs

Kyriacou, P. A., Choi, D. M., Moye, A. R., Langford, R. M. and Jones, D. P. (1999). Design and evaluation of a new electro-optical system for monitoring oesophageal photoplethysmographs. Medical & Biological Engineering & Computing, 37(1),

Abstract

When peripheral perfusion is poor and barely pulsatile, arterial blood oxygen saturation (SpO2) readings from commercial pulse oximeter probes placed peripherally can become unreliable or cease. The human oesophagus has been investigated as a potential measurement site on the hypothesis that perfusion may be better preserved at this central site. A new reflectance photoplethysmographic (PPG) optical sensor and a signal processing and data acquisition system have been developed. Oesophageal PPG signals were obtained from 16 anaesthetised patients and displayed on a laptop computer. PPGs with high signal-to-noise ratio at two wavelengths (red and infrared) and five oesophageal depths were recorded. Signals from the middle oesophagus were larger than those from the upper and deep oesophagus.

Publication Type: Article
Subjects: R Medicine
T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering
School of Mathematics, Computer Science & Engineering > Engineering > Electrical & Electronic Engineering
URI: http://openaccess.city.ac.uk/id/eprint/14685
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