Evaluation of apheresis platelet concentrates collected with a reduced (30-ml) collection chamber with resuspension and storage in a synthetic medium.

Recently, the CS-3000 Plus Blood Cell Separator with the TNX-6 platelet separation chamber insert has been furnished with a small-volume (30-ml) collection chamber. In this study, a platelet synthetic medium containing glucose and bicarbonate (PSM) was used for resuspension and storage of this highly concentrated platelet product. Eighteen donors participated in a paired study design where each participant donated platelets on two occasions, once following collection in a standard chamber with resuspension and storage in plasma and once following collection in the new chamber with resuspension and storage in PSM. Substantially higher total platelet counts were obtained using platelets collected in the small chamber and stored in PSM as compared to control (4.4 +/- 0.9 x 10(11) vs. 3.5 +/- 0.9 x 10(11) platelets, p < 0.01 by paired t test). After 5 days of storage, PSM-stored platelets demonstrated higher ATP levels, less lactate dehydrogenase in the supernatant and increased lactate production with resulting lower pH at day 5 of storage (6.94 +/- 0.15 vs. 7.08 +/- 0.09, p < 0.05). There were no statistically significant differences of the survival by multiple-hit estimation of PSM-stored as compared to plasma-stored platelets as determined by 111In labeling and infusion. A slight decrease in the initial percent recovery with the additive-suspended as compared to suspended plasma cells was noted: 50 +/- 8 versus 54 +/- 9%, respectively (p < 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)