Real-time optical monitoring of tissue vitality in vivo

Avraham Mayevsky; Tamar Manor; Eliyahu Pevzner; Assaf Deutsch; Revital Etziony; Nava Dekel

doi:10.1117/12.463821

26 March 2002 Real-time optical monitoring of tissue vitality in vivo

Avraham Mayevsky, Tamar Manor, Eliyahu Pevzner, Assaf Deutsch, Revital Etziony, Nava Dekel

Proceedings Volume 4616, Optical Fibers and Sensors for Medical Applications II; (2002) https://doi.org/10.1117/12.463821
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

Evaluation of tissue O₂ balance (Supply/Demand) could be done by monitoring in real-time 2 out of the 3 components of the tissue O₂ balance equation. In our previous publication (Mayevsky et al, SPIE Vol. 4255:33-39, 2001) we had shown the use of the multiparametric monitoring approach in the neurosurgical operating room, using a device combined of laser Doppler flowmeter (LDF) and surface fluorometer reflectometer. The two instruments having two different light sources, were connected to the tissue via a combined bundle of optical fibers. In order to improve the correlation between tissue blood flow and mitochondrial NADH redox state, the new Tissue Spectroscope (TiSpec) that was designed has a single light source and a single bundle of optical fibers. Preliminary results show very clear correlation between TBF and NADH redox state. In addition, the reflected light at the excitation wavelength could be used as an indication for blood volume changes. The results obtained by the TiSpec enabled us to compare tissue O₂ delivery (TBF) with O₂ balance (NADH redox state) in the brain of gerbils and rats exposed to ischemia, anoxia and spreading depression. Real-time monitoring of the metabolic state of the tissue has immense potential during surgical procedures.

Citation Download Citation

Avraham Mayevsky, Tamar Manor, Eliyahu Pevzner, Assaf Deutsch, Revital Etziony, and Nava Dekel "Real-time optical monitoring of tissue vitality in vivo", Proc. SPIE 4616, Optical Fibers and Sensors for Medical Applications II, (26 March 2002); https://doi.org/10.1117/12.463821

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