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Repeat low density lipoprotein (LDL) apheresis and blood flow determinations in the forearm and leg were performed in 10 patients (age range, 13-49 years; four male, six female) with familial hypercholesterolemia (eight homozygous, two heterozygous). To perform LDL apheresis, plasma was first separated by a polysulphone hollow fiber filter; then, LDL was selectively removed from plasma by dextran sulphate cellulose beads packed in columns. Blood flows in the forearm and leg were determined at rest and during a reactive hyperemia test (peak flow). This test was performed noninvasively by a strain-gauge plethysmograph with semicontinuous registration of arterial blood flow variables before the first apheresis and 3 weeks after the last of six procedures for apheresis. Resting arterial blood flows in the forearm and leg were slightly increased after repeat LDL apheresis (p less than 0.05). Peak blood flow in the leg significantly increased (+34%, p less than 0.01). No change in peak blood flow in the forearm was observed. Systolic blood pressures were slightly but significantly reduced (p less than 0.05); forearm peripheral resistances were also reduced (p less than 0.05). Flow response was not related to LDL receptor status. Blood and plasma viscosities were determined before and 7 days after the last apheresis. Blood viscosity was significantly reduced after LDL apheresis at shear rates of 11.25-450 sec-1. Plasma viscosity did not change.

Hemodynamic changes in the peripheral circulation after repeat low density lipoprotein apheresis in familial hypercholesterolemia.