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Comparison of Backscattering and Transmission Methods for Measuring RBC Aggregation
Yijie Yang(양 이지에),Jaeyong Ko(고재용),Jeonghun Nam(남정훈),ChangBeom Kim(김창범),Sehyun Shin(신세현) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The aggregation characteristics of red blood cells (RBCs) play an important role in the microvascular flow system and increased RBC aggregation has been observed in various pathological diseases, such as thrombosis and myocardial infarction. Currently available techniques for measuring RBC aggregation used to adopt optical methods such as backscattering and transmission. The present study aims to compare these two methods in measuring RBC aggregation based on a disposable microchip with a magnetic stirring mechanism and a laser-light backscattering/transmission detection system. In the results, the backscattering method showed higher value of aggregation index than the transmission method. In order to discussed the cause of the difference between two methods and optical characteristics in RBC suspensions, two methods were investigated with varying chamber height of microchip, hematocrit and fibrinogen concentration.
A Novel Stress-Scanning Microfluidic Assay of RBC Aggregation Characteristics
Yijie Yang(양 이지에),Jianxun Hou(호우 지엔쉰),Jaeyong Ko(고재용),Jeonghun Nam(남정훈),ChangBeom Kim(김창범),Sehyun Shin(신세현) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Red blood cell (RBC) aggregation is a hemorheological characteristic which plays an important role in microcirculation. This paper presents a new approach using optical method and shear stress-scanning mechanism to measuring RBC aggregation in varied shear flow. The backscattered light intensity and shear stress were measured in a microchannel with respect to time. Then, the critical time and critical shear stress were introduced, as newly-proposed indexes of aggregation, after analysis of the time recording of the backscattered light intensity and shear stress. It is experimentally proven that the new indexes quantitatively represent the aggregation characteristics of RBC-plasma suspensions with varying fibrinogen concentrations. The present approach to measuring RBC aggregation offers a new concept in the study of hemorheology and has potential to be applied to basic science research and point-of-care use.