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14 October 2003 Development of a fluorescence endoscopic system for pH mapping of gastric tissue
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Measurement of gastro intestinal intramucosal pH (pHim) has been recognized as an important factor in the detection of hypoxia induced dysfonctions. However, current pH measurements techniques are limited in terms of time and spatial resolutions. A major advance in accurate pH measurement was the development of the ratiometric fluorescent indicator dye, 2',7'-bis(carboxyethyl)-5,6-carboxyfluorescein (BCECF). BCECF which pKa is in the physiological pH range is suitable for pH tissue measurements in vivo. This study aimed to develop and evaluate an endoscopic imaging system for real time pH measurements in the stomach in order to provide to ICU a new tool for gastro intestinal intramucosal pH (pHim) measurements. This fluorescence imaging technique should allow the temporal exploration of sequential events, particularly in ICU where the pHim provides a predictive information of the patient' status. The experimental evaluations of this new and innovative endoscopic fluorescence system confirms the accuracy of pH measurement using BCECF.
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Philippe Rochon, Serge Mordon, Bruno Buys, Guy Dhelin, Jean Claude Lesage, and Claude Chopin "Development of a fluorescence endoscopic system for pH mapping of gastric tissue", Proc. SPIE 5143, Novel Optical Instrumentation for Biomedical Applications, (14 October 2003);

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