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Reduced erythrocyte deformability alters pulmonary hemodynamics
M P Doyle1, W R Galey, B R Walker
1Department of Physiology, School of Medicine, University of New Mexico, Albuquerque 87131.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 1, 1989
Summary
Stiffened red blood cells (RBCs) significantly increase pulmonary arterial pressure and hemodynamic resistance in rat lungs, independent of vasoconstriction. This highlights the impact of RBC deformability on pulmonary circulation.
Area of Science:
- Physiology
- Biophysics
- Cardiovascular Research
Background:
- Altered red blood cell (RBC) deformability can impact blood flow dynamics.
- Pulmonary hemodynamics are sensitive to changes in blood viscosity and cellular properties.
Purpose of the Study:
- To investigate the effect of reduced red blood cell (RBC) deformability on pulmonary hemodynamics in isolated rat lungs.
- To quantify the relationship between RBC stiffening and pulmonary arterial pressure.
Main Methods:
- Isolated rat lungs were perfused with normal and glutaraldehyde-stiffened RBC suspensions.
- Pressure-flow (P/Q) curves were generated to measure pulmonary arterial pressure (Ppa) at various flow rates.
- RBC deformability was assessed using filtration time, and experiments included vasoconstriction challenges.
Main Results:
- Glutaraldehyde treatment decreased RBC deformability by 6% and 21%, leading to significant increases in Ppa.
- Increased Ppa correlated with the degree of RBC stiffening, affecting P/Q curves.
- Stiffened RBCs and vasoconstriction had additive effects on Ppa.
Conclusions:
- Decreased red blood cell (RBC) deformability elevates pulmonary hemodynamic resistance.
- RBC stiffening contributes to pulmonary hypertension independently of vasoactivity.
- Maintaining RBC deformability is crucial for normal pulmonary circulation.