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PO2 measurements in the rat intestinal microcirculation
M Sinaasappel1, C Donkersloot, J van Bommel
1Department of Anesthesiology, Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands. m.sinaasappel@amc.uva.nl
The American Journal of Physiology
|June 11, 1999
Summary
Optical fiber measurements of microvascular partial oxygen pressure (PO2) using palladium-porphyrin accurately reflect capillary and venule PO2 in rat intestines. This validates the fiber technique for studying microcirculatory oxygenation.
Area of Science:
- Physiology
- Biomedical Engineering
- Microcirculation Research
Background:
- Microvascular partial oxygen pressure (PO2) is crucial for understanding tissue oxygenation, especially in shock models.
- Optical fiber techniques using palladium-porphyrin (Pd-porphyrin) offer a method for PO2 measurement.
- The specific microcirculatory compartment interrogated by fiber-based PO2 measurements remains unclear.
Purpose of the Study:
- To determine if intestinal microvascular PO2 measured by a fiber phosphorometer accurately represents the microcirculatory compartment.
- To validate a novel intravital phosphorometer with enhanced sensitivity for high PO2 levels.
Main Methods:
- Development and validation of a new intravital phosphorometer sensitive to PO2 up to 180 mmHg.
- Measurement of PO2 in rat ileal arterioles, capillaries, and venules under varying inspired oxygen fractions (15%, 25%, 50%).
- Simultaneous PO2 measurement using an optical fiber attached to a separate phosphorometer.
Main Results:
- PO2 measurements using the fiber phosphorometer demonstrated a strong correlation with PO2 in capillaries and first-order venules (r² = 0.94, slope = 0.99).
- The developed phosphorometer showed improved sensitivity for high PO2 levels.
Conclusions:
- The fiber phosphorometer technique accurately reflects capillary and venular PO2 in the intestinal microcirculation.
- This validates the use of fiber-based optical methods for assessing microcirculatory oxygenation in physiological and pathological states.