Document Detail


Dual-wavelength phosphorimetry for determination of cortical and subcortical microvascular oxygenation in rat kidney.
MedLine Citation:
PMID:  16357065     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study presents a dual-wavelength phosphorimeter developed to measure microvascular PO2 (microPO2) in different depths in tissue and demonstrates its use in rat kidney. The used phosphorescent dye is Oxyphor G2 with excitation bands at 440 and 632 nm. The broad spectral gap between the excitation bands combined with a relatively low light absorption of 632 nm light by tissue results in a marked difference in penetration depths of both excitation wavelengths. In rat kidney, we determine the catchments depth of the 440-nm excitation to be 700 microm, whereas the catchments depth of 632 nm is as much as 4 mm. Therefore, the measurements differentiate between cortex and outer medulla, respectively. In vitro, no difference in PO2 readings between both channels was found. On the rat kidney in vivo, the measured cortical microPO2 was on average 20 Torr higher than the medullary microPO2 over a wide PO2 range induced by variations in inspired oxygen fraction. Examples provided from endotoxemia and resuscitation show differences in responses of mean cortical and medullary PO2 readings as well as in the shape of the PO2 histograms. It can be concluded that oxygen-dependent quenching of phosphorescence of Oxyphor G2 allows quantitative measurement of microPO2 noninvasively in two different depths in vivo. Oxygen levels measured by this technique in the rat renal cortex and outer medulla are consistent with previously published values detected by Clark-type oxygen electrodes. Dual-wavelength phosphorimetry is excellently suited for monitoring microPO2 changes in two different anatomical layers under pathophysiological conditions with the characteristics of providing oxygen histograms from two depths and having a penetration depth of several millimeters.
Authors:
Tanja Johannes; Egbert G Mik; Can Ince
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Publication Detail:
Type:  Comparative Study; In Vitro; Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-12-15
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  100     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-03-16     Completed Date:  2007-01-04     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1301-10     Citation Subset:  IM    
Affiliation:
Department of Physiology, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Animals
Anoxia / metabolism
Endotoxemia / metabolism
Fiber Optic Technology / methods
Kidney Cortex / anatomy & histology,  blood supply,  metabolism*
Kidney Medulla / anatomy & histology,  blood supply,  metabolism*
Luminescent Agents / chemistry
Luminescent Measurements / instrumentation*
Male
Metalloporphyrins / chemistry
Microcirculation
Oxygen / analysis*,  metabolism
Oxygen Consumption
Rats
Rats, Wistar
Reproducibility of Results
Time Factors
Chemical
Reg. No./Substance:
0/Luminescent Agents; 0/Metalloporphyrins; 0/oxyphor G2; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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