Comparison of three instruments for measuring red blood cell aggregation

Area of Science:

• Hemorheology
• Biomedical Engineering
• Hematology

Background:

• Red blood cell (RBC) aggregation is a critical factor in hemorheology.
• Accurate measurement of RBC aggregation is essential for understanding various physiological and pathological conditions.

Purpose of the Study:

• To compare the performance of three instruments: LORCA, Myrenne Aggregometer, and RheoScan-A for measuring RBC aggregation.
• To assess the intra-assay reproducibility, biological variability, and sensitivity of these instruments under different conditions.

Main Methods:

• Workshop comparing LORCA, Myrenne Aggregometer, and RheoScan-A.
• Measurements included RBCs in diluted plasma, dextran, and glutaraldehyde-treated cells.
• Assessed intra-assay reproducibility, biological variability, and instrument sensitivity using standardized difference values.

Main Results:

• Intra-assay variations were generally below 5%, with exceptions for RheoScan-A amplitude (AMP) and surface area (SA).
• Biological variability was highest for half-time (T1/2), with other indices showing similar variability across devices.
• All instruments detected changes with plasma dilution; Myrenne and LORCA detected differences in dextran, but RheoScan-A did not.
• Glutaraldehyde treatment significantly affected parameters on all instruments, with varying sensitivity.

Conclusions:

• LORCA, Myrenne, and RheoScan-A demonstrate acceptable precision for detecting reduced RBC aggregation due to plasma dilution.
• The RheoScan-A may not detect significantly enhanced RBC aggregation, and the Myrenne M1 index might be insensitive to minor increases in cell rigidity.
• Further research is needed to define the optimal operating range for each instrument in RBC aggregation analysis.