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pO2 measurements in arteriolar networks

I P Torres Filho1, H Kerger, M Intaglietta

  • 1Departamento de Ciências Fisiológicas, UERJ, Rio de Janeiro, Brazil.

Microvascular Research
|March 1, 1996
PubMed
Summary

Arterioles lose oxygen along their length in hamsters, with oxygen levels decreasing significantly from larger to smaller vessels. This indicates arterioles play a key role in delivering oxygen to the skin.

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Area of Science:

  • Physiology
  • Microcirculation Research
  • Biomedical Engineering

Background:

  • Previous studies indicated lower arteriolar partial pressure of oxygen (pO2) than systemic arterial pO2 in hamster skinfold preparations.
  • The existence and extent of longitudinal pO2 gradients within precapillary vessels remained to be fully elucidated.

Purpose of the Study:

  • To test the hypothesis of a longitudinal pO2 gradient along precapillary (arteriolar) vessels in vivo.
  • To quantify oxygen loss within the arteriolar network and its contribution to tissue oxygenation.

Main Methods:

  • Experiments utilized Syrian golden hamsters with dorsal skin chambers for microcirculation observation.
  • Intravascular pO2 was measured using oxygen-dependent phosphorescence quenching of palladium-porphyrin complexes.
  • Arterioles were classified by order, and measurements included diameter, red blood cell velocity, and systemic blood gases.

Main Results:

  • A significant decrease in pO2 was observed along the arteriolar network, from 51.8 mmHg in first-order to 34.0 mmHg in terminal arterioles.
  • An average longitudinal arteriolar oxygen saturation gradient of 3.4%/mm was measured.
  • Oxygen loss was detected in arterial vessels larger than 100 micrometers in diameter.

Conclusions:

  • Arteriolar pO2 is dependent on vessel position within the microcirculatory network.
  • The arteriolar network significantly contributes to oxygen delivery in hamster skin.
  • The capillary network's contribution to tissue oxygenation appears relatively small due to a minimal pO2 gradient between terminal arterioles and venules.

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