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Correlation between ventilation and perfusion determines VA/Q heterogeneity in endotoxemia
A J Gerbino1, S McKinney, R W Glenny
1Department of Medicine, University of Washington, Seattle 98195, USA. gerbino@u.washington.edu
Journal of Applied Physiology (Bethesda, Md. : 1985)
|June 14, 2000
Summary
Endotoxin increases lung ventilation-to-perfusion (VA/Q) heterogeneity, mainly by disrupting the correlation between ventilation and perfusion, driven by altered blood flow distribution.
Area of Science:
- Pulmonary Physiology
- Respiratory Medicine
- Critical Care
Background:
- Endotoxin administration is known to increase ventilation-perfusion ratio (VA/Q) heterogeneity in the lungs.
- The specific alterations in alveolar ventilation (VA) and perfusion contributing to this heterogeneity remain unclear.
Purpose of the Study:
- To investigate how endotoxin impacts the distributions of ventilation and perfusion.
- To determine the effect of these changes on overall VA/Q heterogeneity.
Main Methods:
- Utilized juvenile pigs under anesthesia and mechanical ventilation.
- Administered E. coli endotoxin intravenously.
- Measured regional ventilation and perfusion simultaneously using fluorescent microspheres.
Main Results:
- Endotoxemia significantly reduced the correlation between regional ventilation and perfusion.
- Perfusion heterogeneity increased, with significant redistribution of blood flow between lung regions.
- Ventilation heterogeneity remained unchanged, with only modest redistribution.
Conclusions:
- VA/Q heterogeneity increases during endotoxemia primarily due to decreased correlation between ventilation and perfusion.
- This decoupling is predominantly driven by alterations in pulmonary perfusion patterns.