title: Evaluation of the Haemonetics V50--time saver protocol.
abstract: 196 platelet apheresis procedures using the cell separator Haemonetics V 50 were performed applying 8 cycles under varying conditions. The anticoagulant ACD-A was used in a whole-blood to anticoagulant ratio of 8:1. The flow rate was selected for a range of 40-70 ml/min and the centrifuge speed was established at 4,800 and 4,400 rpm. The PWC factor was chosen between 0 and 4. 162 procedures could be statistically evaluated. 34 apheresis were accompanied with technical complications. The mean yield was (4.3 +/- 1.05) x 10(11) platelets, and the average of extraction efficiency (EE) was 53.9 +/- 8.2%. An analysis of variance confirmed that a higher flow rate decreased the EE (p < 0.002) and also the leukocyte counts (p < 0.0005). Increasing the PWC factor led to a higher EE; however, the leukocyte counts of the platelet concentrate were also increased (p < 0.0005). The g force has an essential effect. A high g force of the centrifuge permits to obtain a large quantity of platelets which is combined with a higher leukocyte contamination. Decreasing the centrifuge speed to 4,400 rpm by using PWC factors of 0 and 4 with different flow rates (50 and 60 ml/min) decreased the EE and the leukocyte counts in the product.
authors.affiliation: Hmapherese Einheit, Klinik I für Innere Medizin, Universität zu Köln.
authors.forename: F
authors.initials: F
authors.lastname: Soudavar
authors.forename: H
authors.initials: H
authors.lastname: Borberg
mesh_terms: D000328:Adult; D001782:Blood Donors; D004867:Equipment Design; D004869:Equipment Safety; D006801:Humans; D010976:Platelet Count; D010983:Plateletpheresis / Q000295:instrumentation*; D013997:Time Factors