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Continuous-flow centrifugation hemapheresis in the horse.

In a continuous-flow centrifugation apheresis technique adapted for blood-component separation and collection in horses, hydroxyethyl starch was not required for erythrocyte sedimentation. The efficacy and separation characteristics of whole blood from 10 horses were evaluated at various gravitational forces (700 to 1,500 rpm), using a constant withdrawal rate (100 ml/min). Maximum leukocyte collection occurred at 700 rpm (P less than 0.01), and optimal neutrophil collection occurred at 700 to 750 rpm (P less than 0.01). Although neutrophil counts decreased and lymphocyte counts remained constant at higher rpm settings, an optimal rpm range could not be determined for lymphocyte collection. Peak platelet collection occurred at 1,500 rpm. The response of whole blood from 5 horses was evaluated at lower (500 to 700 rpm) and higher (1,400 to 2,200 rpm) centrifuge speeds. A constant whole blood withdrawal rate of 100 ml/min and a leukocyte collection rate of 3 ml/min were maintained. The optimal rpm settings were determined and compared with values obtained from the 10 horses. Significant differences (P less than 0.01) did not exist between maximum numbers of leukocytes collected at low and high speeds. There was a significant (P less than 0.01) decrease in neutrophils and a concomitant increase in the numbers of lymphocytes recovered at the higher rpm. Platelet yields increased as rpm was increased to 2,000.