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Erythrocyte deformability in Waldenström's macroglobulinemia
S Ramakrishnan1, R Degenhardt, K Vietzke
1Curriculum Development Centre, Anna University, Madras, Chennai, India. ramki@annauniv.edu
Clinical Hemorheology and Microcirculation
|March 11, 2000
Summary
Erythrocyte deformability is reduced in Waldenström's Macroglobulinemia (WM) patients, especially under high shear stress. This impaired red blood cell function may impact microvascular blood flow.
Area of Science:
- Hematology
- Biophysics
- Medical Physics
Background:
- Waldenström's Macroglobulinemia (WM) is a rare B-cell lymphoproliferative disorder.
- Erythrocyte deformability is crucial for microvascular circulation.
- Altered blood rheology is implicated in various hematological conditions.
Purpose of the Study:
- To investigate the in vitro deformability of erythrocytes from Waldenström's Macroglobulinemia patients.
- To compare erythrocyte deformability in WM patients with healthy controls under varying shear stress conditions.
Main Methods:
- Erythrocytes from WM patients and healthy volunteers were analyzed using a shear stress diffractometer.
- Red blood cell elongation index was measured at shear forces ranging from 0.3 to 60 Pa.
- Laser diffraction patterns were used to quantify erythrocyte deformation.
Main Results:
- Erythrocyte deformability showed a shear-dependent decrease in WM patient samples.
- A significant reduction in the deformability index was observed at high shear forces (>12 Pa) in WM patients compared to controls.
- No significant difference in deformability was found at low shear forces.
Conclusions:
- Erythrocytes from WM patients exhibit reduced deformability, particularly under higher shear stress.
- Impaired erythrocyte deformability, alongside elevated plasma viscosity and aggregation, may contribute to microvascular flow stagnation in WM.
- These findings highlight the clinical relevance of rheological alterations in Waldenström's Macroglobulinemia.