Title :
The human esophagus: Investigation of its suitability for monitoring SpO2
Author :
Kyriacou, P.A. ; Choi, D.M.A. ; Moye, A.R. ; Langford, R.M. ; Jones, D.P.
Author_Institution :
Dept. of Med. Electron. & Phys., Queen Mary & Westfield Coll., London, UK
Abstract :
Pulse oximeter probes placed peripherally may fail to give accurate values of arterial blood oxygen saturation (SpO2) when peripheral perfusion is poor. Since central blood flow may be preferentially preserved, the esophagus was investigated as an alternative monitoring site. A new esophageal photoplethysmographic (PPG) probe and a signal processing system were developed. Esophageal PPG signals and standard ECG traces were obtained from 13 anesthetized patients and displayed on a laptop computer. PPGs with good signal-to-noise ratio were recorded from five esophageal depths. The mid to lower esophagus appeared to be the optimal site for monitoring SpO 2. The pulse transit times (PTT) to the esophagus were 95±36 ms
Keywords :
biomedical measurement; blood; chemical variables measurement; medical signal processing; oxygen; patient monitoring; plethysmography; surgery; 655 nm; 880 nm; O2; SpO2 monitoring; alternative monitoring site; anesthetized patients; arterial blood oxygen saturation; central blood flow; esophageal PPG signals; esophageal depths; esophageal photoplethysmographic probe; human esophagus; laptop computer; optimal site; peripheral perfusion; pulse oximeter probes; pulse transit times; signal processing system; signal-to-noise ratio; standard ECG traces; Blood flow; Computerized monitoring; Condition monitoring; Electrocardiography; Esophagus; Humans; Patient monitoring; Portable computers; Probes; Signal processing;
Conference_Titel :
[Engineering in Medicine and Biology, 1999. 21st Annual Conference and the 1999 Annual Fall Meetring of the Biomedical Engineering Society] BMES/EMBS Conference, 1999. Proceedings of the First Joint
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-5674-8
DOI :
10.1109/IEMBS.1999.804007
