Extended storage of single‐donor platelet concentrate collected by a blood cell separator

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Abstract
Use of a sealless blood pathway in a blood cell sepaator (CS-3000, Fenwal) permits collection of platelets in a "closed system" when saline and anticoagulant solutions are integrally attached; this in turn allows storage of instrument-collected platelet concentrates (PCs) beyond 24 hours. To evaluate extended storage of high yield PCs, cells collected with the instrument were stored (200 ml plasma) for 8 days (flatbed agitation) in either 3-liter polyvinylchloride (PL 146) containers (n = 6), polyolefin bags (PL 732) (n = 8), or two 1-liter polyolefin (double PL 732) containers (n = 8). A mean of 4.45, 4.09, and 3.94 .times. 1011 platelets wer stored in PL 146, single PL 732, and double PL 732, respectively; total white cells per container averaged 0.3, 0.2, and 0.2 .times. 109 for the three container systems. By day 1, platelet pO2 dropped to 14 and 16 torr in PL 146 and PL 732 PCs (pCO2, 127, and 82 torr). In contrast, double PL 732 maintained high pO2 (.simeq. 80 torr) and low pCO2 (.simeq. 80 torr) through a day eight. Glucose declined at faster rates in PL 146 and single PL 732 containers, while lactate increased more raidly (338 and 197 ml/dl of lactate on day four vs. 116 mg/dl for double PL 732 units). Morphology scores dropped from 400 to 98 (PL 146) and 216 (PL 732) at day four (pH values of 6.3 and 7.0), while a score of 330 was seen in double PL 732 PCs. Morphology score (170) and pH (7.2) were maintained well through day seven in double PL 732 as was platelet aggregation response. Electron microscopic studies paralleled morphology scores; 7-day storage of platelets colleced with the instrument appears feasible.