What question did this study set out to answer?

To determine the kinetics, tissue distribution spaces, and cellular uptake mechanisms of tracer oxygen in isolated perfused rat livers across varying temperatures and hematocrit levels.

September 1, 1992HepatologyOpen Access

Flow–Limited Tracer Oxygen Distribution in the Isolated Perfused Rat Liver: Effects of Temperature and Hematocrit

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Authors

IKIbrahim KassissiaCanadian Sleep & Circadian Network CRColin P. RoseGeneral / Preventive / Lipids CGCarl A. GoreskyMedical Council of Canada

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Implication

Ex vivo perfusion study demonstrates flow-limited oxygen distribution in rat liver, indicating tissue uptake is determined by blood delivery rather than cellular diffusion barriers.

Key Points

To determine the kinetics, tissue distribution spaces, and cellular uptake mechanisms of tracer oxygen in isolated perfused rat livers across varying temperatures and hematocrit levels.
Perfused isolated rat livers with blood in a nonrecirculating system and administered single simultaneous portal vein injections of 51Cr-labeled 18O2-saturated red blood cells alongside vascular, interstitial, and cellular tracers.
Collected timed anaerobic hepatic vein outflow samples and analyzed them via mass spectrometry for 18O2 enrichment and scintillation counting for radioactivity across temperatures of 32°C and 37°C under high and low hematocrit conditions.
Tracer oxygen distribution followed a flow-limited rather than barrier-limited pattern, showing substantially diminished consumption with recovery approaching vascular references at 32°C and high intracellular sequestration at 37°C.
Oxygen consumption at both 32°C and 37°C was independent of hematocrit, although the oxygen distribution space relative to vascular sinusoids decreased at higher hematocrit and increased at lower hematocrit.
The derived liver cell-to-plasma oxygen partition coefficient averaged 2.62 ml/ml across conditions and remained independent of hematocrit.

Cite This Study

Kassissia et al. (1992) studied this question.

synapsesocial.com/papers/6a9195bc62841d9e29fb82e9 https://doi.org/10.1002/hep.1840160324

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Implication

Ex vivo perfusion study demonstrates flow-limited oxygen distribution in rat liver, indicating tissue uptake is determined by blood delivery rather than cellular diffusion barriers.

Flow–Limited Tracer Oxygen Distribution in the Isolated Perfused Rat Liver: Effects of Temperature and Hematocrit

Discussion

Member takes

Implication

Key Points

Cite This Study

Flow–Limited Tracer Oxygen Distribution in the Isolated Perfused Rat Liver: Effects of Temperature and Hematocrit

Discussion

Member takes

Implication

Key Points

Cite This Study

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