Effects of Static Magnetic Fields on Erythrocyte Rheology

The acute influence of an external static magnetic field on the erythrocyte rheology is briefly reviewed. 1) The magnetohydrodynamic action may be effective to alter the fast blood flow in aorta at a field over 5 T, but no experimental study has been made. 2) The diamagnetic interaction, between the normal blood component and uniform magnetic field, has been found: i.e., the biconcave disk-shaped erythrocytes and platelets orient their flat plane parallel to the field direction above several T. 3) The paramagnetic interaction, effective only on a slow flow of deoxygenated erythrocytes, affects the distribution of erythrocytes within a vessel by the paramagnetic attractive force, which is proportional to the product of [flux density] × [spatial gradient], the magnetic susceptibility of erythrocytes. and the reciprocal of the flow velocity. Our model study showed that the paramagnetic interaction may be effective under an anemic situation and under an inhomogeneous magnetic field over above 100 T2/m for the product of [flux density] × [spatial gradient].

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