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A Swine Model of Neonatal Asphyxia
Published on: October 11, 2011
Regional hypoxic pulmonary vasoconstriction in prone pigs
I R Starr1, W J E Lamm, B Neradilek
1Department of Medicine, Univ. of Washington, Seattle, WA, USA.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 19, 2005
Summary
Hypoxic pulmonary vasoconstriction (HPV) causes regional blood flow shifts in the lungs. Different HPV response patterns were identified in specific lung regions, even with matched ventilation/perfusion.
Area of Science:
- Physiology
- Pulmonary Medicine
- Cardiovascular Research
Background:
- Hypoxic pulmonary vasoconstriction (HPV) influences pulmonary blood flow distribution.
- Regional differences in HPV response within well-matched lungs remain unclear.
Purpose of the Study:
- To investigate regional variations in the HPV response in lungs with matched ventilation/perfusion.
- To identify distinct patterns of pulmonary blood flow changes during hypoxia.
Main Methods:
- Utilized a prone porcine model with mechanical ventilation.
- Applied the fluorescent microsphere technique to quantify regional pulmonary blood flow and ventilation.
- Analyzed blood flow patterns across varying inspired oxygen fractions (FI(O2)) and clustered responses.
Main Results:
- Identified unique regional patterns of pulmonary blood flow response to hypoxia.
- Observed blood flow redistribution from cranial to caudal lung regions with increasing hypoxia.
- Found distinct HPV response clusters spatially located in cranial, central, and caudal lung portions.
Conclusions:
- Pulmonary blood flow changes due to HPV create distinct regional response patterns.
- These patterns are consistent across similar lung regions in the porcine model.
- Regional HPV responses can vary even in lungs with initially matched ventilation/perfusion.
