within three days or less. In these suspensions there was no hemolysis either before or after the addition of saline solution. For patients with a more temporary type of anemia the cells can be stored for five to seven days before being used. It has been shown that the survival time of transfused erythrocytes in stored whole blood decreases rapidly after a storage period of more than seven days.9The English workers 10 have used red cell suspensions in a more or less concentrated form, i. e. with little or no addition of aqueous solutions. This is definitely advantageous for patients with cardiac insufficiency and anemia. It would also make possible the transfusion of larger amounts of cells over a short period of time.In the present work, saline solution has been added to decrease the viscosity of the blood and consequently to facilitate the flow through the transfusion system. It would be just as well to add only 100 or 150 cc. of saline solution to the cells from 500 cc. of blood or to omit the saline solution entirely.11
COMMENTThe main value of red cell transfusions is to increase the erythrocyte count in patients with anemia. After severe hemorrhage, spontaneous recovery of the anemia takes about six weeks or longer. In such a case the daily administration of red cells from a liter of blood will bring the erythrocyte count to normal within a few days. If cells could be made available to the armed forces, it would materially hasten the rehabilitation of wounded men who have suffered from hemorrhage. In patients with severe iron deficiency, the hemoglobin value can be raised rapidly with red cell transfusions. During the gradual destruction of the transfused cells, iron is released for further hemoglobin formation. Red cell transfusions are also effective in other types of anemia. Their use in progressive refractory anemia has already been emphasized. The chief advantage of transfusions with red cell sus¬ pensions over whole blood is the factor of economy. With the widespread use of plasma, great quantities of red cells will continue to be a by-product. Should red cell transfusions come into common use, it will be pos¬ sible to divide the cost of whole blood between the plasma and the cells. If and when red cell suspensions become generally available at a low cost, it is rational that they should be used in larger amounts and more frequently in the treatment of anemia than whole blood is used at the present time.
SUMMARYRed cell transfusions are a satisfactory substitute for whole blood transfusions in the treatment of anemia.A patient with progressive refractory anemia has been sustained for a year with transfusions of the red cell suspensions obtained from 25.5 liters of blood. Because red cells are a by-product in the preparation of blood plasma, it is practical to give them in larger amounts and more frequently than heretofore has been the practice with whole blood. 9. Wiener, A. S., and Schaefer, George: Limitations in the Use of Preserved Blood for Transfusions: A Study of the Fate of the Transfused Eryt...