The cell-free layer in microvascular blood flow.

Area of Science:

• Physiology
• Biophysics
• Microcirculation Research

Background:

• The cell-free layer (CFL) at the microvessel wall is increasingly recognized for its physiological significance.
• Advancements in imaging and measurement techniques allow for detailed examination of CFL characteristics.
• Understanding CFL dynamics is crucial for comprehending microvascular function.

Purpose of the Study:

• To review the formation of the cell-free layer in microcirculation.
• To emphasize the influence of blood rheological parameters on CFL formation.
• To discuss the potential effects of CFL on microvascular functions.

Main Methods:

• Review of existing literature on microcirculation and blood rheology.
• Analysis of factors influencing cell-free layer formation, including vessel diameter, flow rate, and blood properties.
• Examination of the role of the glycocalyx in CFL formation within microvessels.

Main Results:

• Cell-free layer formation is dependent on vessel diameter, flow rate, and blood rheological properties (hematocrit, red blood cell aggregation, deformability).
• The glycocalyx layer significantly affects CFL formation in microvessels.
• The omnipresent nature of CFL in microcirculation suggests widespread functional impacts.

Conclusions:

• The cell-free layer's characteristics are shaped by blood rheology and vessel properties.
• CFL variations can alter critical microvascular parameters like wall shear stress, local hematocrit, and nitric oxide production.
• Further research into CFL is essential for a comprehensive understanding of microvascular physiology and pathophysiology.