Platelet Concentrates Stored at 22°C Need Oxygen The Significance of Plastics in Platelet Preservation

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Abstract
Platelet concentrates prepared by platelet apheresis were stored in plastic blood bags with different gas permeability properties. Inadequate O2 supply gave an insufficient ATP regeneration and a compensatory increase in glycolysis and lactic acid production, giving a rapidly falling pH. At pH below 6.0 the glycolysis was inhibited, O2 consumption ceased, and ATP dropped towards depletion. Adequate O2 supply kept the lactic acid production low with small pH changes only, and allowed a sufficient ATP regeneration. The release of .alpha.-granular platelet factor 4 (PF4) was almost total at pH below 6.0, while at intact metabolic function there was a slow release of PF4. Platelet preservation is enhanced by the use of blood bags with adequate gas exchange properties. One polyvinyl chloride plastic (PVC) bag gave poor results, while another PVC bag and a polyolefin bag showed intact metabolism for 5 days and a moderate release of PF4.