Posttransfusional Recovery of Defective Respiratory Function of Stored Blood in Dogs

Abstract

Changes in the oxygenation properties and the relevant biochemical parameters of canine blood were followed during its storage in acid-citrate-dextrose (ACD) medium (4°C) and after transfusion of the stored blood. Reductions of the blood P₅₀ (pH 7.40, P_CO2 40Torr, 37°C) and 2, 3-diphosphoglycerate (DPG) during storage was much slower than in human blood. Half-decay time for DPG was 21 and 5 days for canine and human blood, respectively. The DPG decay could be extensively accelerated in the presence of bisulfite in ACD. The stored and DPG- depleted red cells required a considerably long period of time for the complete posttransfusional restoration of the DPG and P₅₀. In five dogs whose blood were exchanged by 84% in average with the stored blood of mean DPG depletion of 88%, mean extents of the DPG and P₅₀ restoration were 74 and 89% of the normal values after 24h. After 5 days both the parameters were within the normal ranges. The red cell extra- along with intra-cellular pH fell immediately after the transfusion, and restored to the normal level after 24h. From these results, correlations between P₅₀ or red cell transmembrane pH gradient at the extracellular pH of 7.40 (ΔpH) and red cell DPG/hemoglobin molar ratio (x) were derived as P₅₀=10.92x+14.2 (r=0.91) or ΔpH=0.60x+0.135 (r=0.70).