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Assessment of photoplethysmographic signals for the determination of splanchnic oxygen saturation in humans
Author(s) -
CrerarGilbert A. J.,
Kyriacou P. A.,
Jones D. P.,
Langford R. M.
Publication year - 2002
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1046/j.0003-2409.2001.02453.x
Subject(s) - medicine , pulse oximetry , splanchnic , photoplethysmogram , oxygenation , plethysmograph , splanchnic circulation , oxygen saturation , pulse (music) , anesthesia , biomedical engineering , oxygen , hemodynamics , chemistry , organic chemistry , filter (signal processing) , detector , computer science , electrical engineering , computer vision , engineering
Summary The need for a clinically applicable method of detecting splanchnic hypoxia has led to experimental animal studies which indicated the usefulness of intestinal pulse oximetry. Pulse oximetry relies on detection of photoplethysmographic signals. Before developing a pulse oximeter for the measurement of organ oxygen saturation peri‐operatively, we designed a system based on a reflectance photoplethysmographic probe to investigate photoplethysmographic signals from human viscera (bowel, liver, and kidney). Recordings were obtained simultaneously from the abdominal viscera and the finger using identical probes. The probe was held sequentially for up to 2 min on the surface of viscera of 12 patients during routine laparotomy. Measurable splanchnic photoplethysmographic signals were recorded for the first time in humans. There were no statistically significant differences between photoplethysmographic amplitudes from viscera and those from the finger. Our results indicate the feasibility of pulse oximetry for the measurement of visceral oxygenation in humans.