Biomaterial Database

[Study of erythrocyte deformability using visco-diffractometry (ektacytometry) in hereditary hemolytic anemias]. 1984

A Herrera, and C J Feo

Deformability is a basic characteristic of red blood cells; its regulating factors are presently well known (surface volume ratio, internal viscosity, viscoelastic properties of the membrane). The contribution of each of these factors in the pathogeny of hemolytic anemias has not been fully established. We report 64 hereditary hemolytic anemias in which we studied the deformability, using a visco-diffractometric method (ektacytometer) on whole blood and various subpopulations separated by density. Comparison of the response of the cells submitted to isotonic and hypotonic media allows the determination of the respective contribution of viscosity and surface volume ratio. Deformability is always decreased in red blood cell membrane diseases and in homozygous or double heterozygous hemoglobinopathies; on the other hand, deformability is normal in all the enzymopathies studied. This decrease could be due either to one regulation factor (increase of internal viscosity easily demonstrated by this method in hereditary xerocytosis and hemoglobin CC) or to several parameters: increase of internal viscosity and decrease of surface volume ratio in hereditary spherocytosis.

UI	MeSH Term	Description	Entries
D001809	Blood Viscosity	The internal resistance of the BLOOD to shear forces. The in vitro measure of whole blood viscosity is of limited clinical utility because it bears little relationship to the actual viscosity within the circulation, but an increase in the viscosity of circulating blood can contribute to morbidity in patients suffering from disorders such as SICKLE CELL ANEMIA and POLYCYTHEMIA.	Blood Viscosities,Viscosities, Blood,Viscosity, Blood
D004912	Erythrocytes	Red blood cells. Mature erythrocytes are non-nucleated, biconcave disks containing HEMOGLOBIN whose function is to transport OXYGEN.	Blood Cells, Red,Blood Corpuscles, Red,Red Blood Cells,Red Blood Corpuscles,Blood Cell, Red,Blood Corpuscle, Red,Erythrocyte,Red Blood Cell,Red Blood Corpuscle
D005434	Flow Cytometry	Technique using an instrument system for making, processing, and displaying one or more measurements on individual cells obtained from a cell suspension. Cells are usually stained with one or more fluorescent dyes specific to cell components of interest, e.g., DNA, and fluorescence of each cell is measured as it rapidly transverses the excitation beam (laser or mercury arc lamp). Fluorescence provides a quantitative measure of various biochemical and biophysical properties of the cell, as well as a basis for cell sorting. Other measurable optical parameters include light absorption and light scattering, the latter being applicable to the measurement of cell size, shape, density, granularity, and stain uptake.	Cytofluorometry, Flow,Cytometry, Flow,Flow Microfluorimetry,Fluorescence-Activated Cell Sorting,Microfluorometry, Flow,Cell Sorting, Fluorescence-Activated,Cell Sortings, Fluorescence-Activated,Cytofluorometries, Flow,Cytometries, Flow,Flow Cytofluorometries,Flow Cytofluorometry,Flow Cytometries,Flow Microfluorometries,Flow Microfluorometry,Fluorescence Activated Cell Sorting,Fluorescence-Activated Cell Sortings,Microfluorimetry, Flow,Microfluorometries, Flow,Sorting, Fluorescence-Activated Cell,Sortings, Fluorescence-Activated Cell
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000745	Anemia, Hemolytic, Congenital	Hemolytic anemia due to various intrinsic defects of the erythrocyte.	Anemia, Hemolytic, Hereditary,Congenital Hemolytic Anemia,Hemolytic Anemia, Congenital,Hemolytic Anemia, Hereditary,Hereditary Hemolytic Anemia,Anemia, Congenital Hemolytic,Anemia, Hereditary Hemolytic,Anemias, Congenital Hemolytic,Anemias, Hereditary Hemolytic,Congenital Hemolytic Anemias,Hemolytic Anemias, Congenital,Hemolytic Anemias, Hereditary,Hereditary Hemolytic Anemias