Perfusion assessment in rat spinal cord tissue using photoplethysmography and laser Doppler flux measurements

Phillips, J. P., Cibert-Goton, V., Langford, R. M. & Shortland, P. J. (2013). Perfusion assessment in rat spinal cord tissue using photoplethysmography and laser Doppler flux measurements. Journal of Biomedical Optics, 18(3), 037005. doi: 10.1117/1.JBO.18.3.037005

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Abstract

Animal models are widely used to investigate the pathological mechanisms of spinal cord injury (SCI), most commonly in rats. It is well known that compromised blood flow caused by mechanical disruption of the vasculature can produce irreversible damage and cell death in hypoperfused tissue regions and spinal cord tissue is particularly susceptible to such damage. A fiberoptic photoplethysmography (PPG) probe and instrumentation system were used to investigate the practical considerations of making measurements from rat spinal cord and to assess its suitability for use in SCI models. Experiments to assess the regional perfusion of exposed spinal cord in anesthetized adult rats using both PPG and laser Doppler flowmetry (LDF) were performed. It was found that signals could be obtained reliably from all subjects, although considerable intersite and intersubject variability was seen in the PPG signal amplitude compared to LDF. We present results from 30 measurements in five subjects, the two methods are compared, and practical application to SCI animal models is discussed.

Item Type: Article
Additional Information: Phillips, JP, Cibert-Goton, V, Langford, RM & Shortland, PJ. Perfusion assessment in rat spinal cord tissue using photoplethysmography and laser Doppler flux measurements. JOURNAL OF BIOMEDICAL OPTICS, 18(3) 037005 (2013). Copyright 2013 Journal of Biomedical Optics. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Uncontrolled Keywords: spinal cord injury; fiberoptic; photoplethysmography; laser Doppler; perfusion; ischemia
Subjects: R Medicine > RC Internal medicine
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: School of Engineering & Mathematical Sciences > Engineering
URI: http://openaccess.city.ac.uk/id/eprint/8139

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