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Proceedings Paper

Analysis of downregulation of cellular energy demand by 2D measurements of intracapillary HbO2, Hb, pO2, and redox state of cytochromes
Author(s): Alfons Krug; Manfred D. Kessler; Jens Hoeper; S. Zellner; Valerie Sourdoulaud
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Paper Abstract

Rapid microlightguide spectrometers (EMPHO IIa/b) and a multiwire pO2 electrode are applied for measurements of heterogeneous distribution of tissue oxygenation and redox state of respiratory enzymes in heart and rat liver. Optical and pO2 measurements are noninvasively performed by use of sensors placed on the surface of tissue. Measurements in isolated perfused rat and in dog heart in situ were performed in order to investigate the relation between myocardial oxygenation and function. The tissue monitoring in liver was initiated by optical and polarographic monitoring in the hemoglobin free perfused organ. Subsequently, erythrocytes were added to the perfusate in several steps. The experiments reveal clear evidence that a protective system of tissue is activated when critical pO2 values at the lethal corner of micro vessels fall off a critical threshold around 5 mmHg, thus causing a depletion of oxidative metabolism.

Paper Details

Date Published: 12 April 1995
PDF: 12 pages
Proc. SPIE 2387, Advances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases II, (12 April 1995); doi: 10.1117/12.206830
Show Author Affiliations
Alfons Krug, Institut fuer Physiologie und Kardiologie (Germany)
Manfred D. Kessler, Institut fuer Physiologie und Kardiologie (Germany)
Jens Hoeper, Institut fuer Physiologie und Kardiologie (Germany)
S. Zellner, Institut fuer Physiologie und Kardiologie (Germany)
Valerie Sourdoulaud, Institut fuer Physiologie und Kardiologie (Germany)


Published in SPIE Proceedings Vol. 2387:
Advances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases II
Robert R. Alfano, Editor(s)

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