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Departments of 1 Biomedical Engineering, 2 Chemical Engineering, and 3 Neurobiology and Physiology, and 4 Institute for Neuroscience, Northwestern University, Evanston, Illinois 60208-3107
Tissue
PO2 was measured in the primary
visual cortex of anesthetized, artificially ventilated, normovolemic
cats to evaluate the effect of small doses [1 g perfluorocarbon
(PFC)/kg] of a PFC emulsion (1 g PFC/1.1 ml emulsion; Alliance
Pharmaceutical, San Diego, CA) on brain oxygenation. The
change in tissue PO2 (
PO2), resulting from briefly
changing the respiratory gas from room air to 100% oxygen, was
measured before and after intravenous infusion of the emulsion. Before
emulsion,
PO2 was 51.1 ± 45.6 Torr (n = 8 cats).
Increases in
PO2 of 34.0 ± 26.1 (SD) % (n = 8) and 16.3 ± 8.4% (n = 6) were observed after the
first and second emulsion infusions, respectively. The further increase
in
PO2 after the third dose (7.9 ± 10.5%; n = 7) was not
statistically significant. The observed increases in tissue oxygenation
as a result of the PFC infusions appear to be the result of enhanced
oxygen transport to the tissue.
tissue oxygen tension; brain
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