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Updated: Jul 14, 2026
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Visualization and Quantification of the Cell-free Layer in Arterioles of the Rat Cremaster Muscle
Published on: October 19, 2016
Temporal and spatial variations of cell-free layer width in arterioles.
Sangho Kim1, Robert L Kong, Aleksander S Popel
1Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093-0412, USA.
Summary
The cell-free layer in arterioles varies with vessel diameter and shows significant, non-Gaussian temporal fluctuations. This layer impacts blood viscosity and wall shear stress in microcirculation.
Area of Science:
- Physiology
- Biophysics
- Microcirculation Research
Background:
- Red blood cell (RBC) separation from plasma forms a cell-free layer (CFL) at vessel walls.
- The CFL is crucial for blood viscosity and wall shear stress, particularly in arterioles where pressure loss and flow regulation are significant.
Purpose of the Study:
- To quantify the width and temporal variations of the CFL in rat cremaster muscle arterioles.
- To investigate the influence of vessel diameter and RBC aggregability on CFL dynamics.
Main Methods:
- Utilized a novel method for rapid and repeated measurement of CFL width in arterioles (10-50 µm diameter).
- Analyzed temporal variations, correlation length, and the impact of RBC aggregability under normal arterial pressure.
Main Results:
- CFL width is diameter-dependent, increasing from 0.8 to 3.1 µm with diameter.
- Temporal variations in CFL width are non-Gaussian, increasing from 30% to 70% of the mean with diameter.
- CFL width showed inverse relationships on opposite sides of the vessel, which was reduced by increased RBC aggregability.
Conclusions:
- Arteriolar CFL width is diameter-dependent and exhibits significant non-Gaussian temporal variations.
- Temporal variations increase with arteriolar diameter and are inversely related across the vessel.
- RBC aggregability influences CFL distribution but not temporal variation correlation length.
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