Intraoperative monitoring of intestinal viability: Evaluation of a new combined sensor

A dual wavelength photoplethysmography (PPG) and laser Doppler flowmetry (LDF) sensor was developed to investigate the suitability of these techniques for monitoring bowel viability intraoperatively. Clinical measurements were obtained from thirty patients undergoing bowel surgery. Three measurement...

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Bibliographic Details
Published in:2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) 2015-01, Vol.2015, p.5126-5129
Main Authors: McGuinness-Abdollahi, Zahra, Thaha, Mohamed A., Ramsanahie, Anthony, Ahmed, Shafi, Kyriacou, Panayiotis A., Phillips, Justin P.
Format: Article
Language:English
Subjects:
Blood flow
Cancer
Doppler effect
Monitoring
Probes
Surgery
Online Access:Request full text
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Summary:A dual wavelength photoplethysmography (PPG) and laser Doppler flowmetry (LDF) sensor was developed to investigate the suitability of these techniques for monitoring bowel viability intraoperatively. Clinical measurements were obtained from thirty patients undergoing bowel surgery. Three measurements were performed at different stages of the operation. The amplitude of infrared PPG decreased from the baseline measurement to the pre-anastomosis measurement by 36% and LDF flux decreased by 21% for the same measurements. An increase of 33% in amplitude for infrared PPG was observed from the pre-anastomotic to post-anastomosis measurement; the equivalent increase was not seen for LDF flux. The results revealed that the sensor could potentially indicate changes in perfusion and blood flow at critical phases of surgery, thereby assisting in the early detection of inadequate blood supply in bowel tissue. The results also suggest that laser Doppler is more sensitive to movement artefact compared to PPG.
ISSN:1094-687X
1558-4615
2694-0604
DOI:10.1109/EMBC.2015.7319545