ABSTRACT
The anti-CD47 monoclonal antibody, one of the immune checkpoint inhibitors, can interfere with pretransfusion testing by binding to the cluster of differentiation 47 (CD47) proteins expressed on the surface of red blood cells (RBCs). We report the experience of mitigating interference in the pretransfusion test in two patients treated with ALX148, an anti-CD47 monoclonal antibody, by using multiple RBC alloadsorption. Two patients with a history of advanced head and neck squamous cell carcinoma were referred for a pretransfusion and cross-matching test. The blood group type of the two patients was B, RhD＋, but antibody screening, autocontrol, direct globulin, and cross-matching of the RBC units showed high-intensity agglutination. Medical records revealed that the patients were enrolled in an anti-CD47 monoclonal antibody clinical trial. To eliminate interference by the drug, we attempted alloadsorption using pooled O, RhD＋ RBCs, and the patient’s plasma in the ratio of 4:1. After three alloadsorption sessions using pooled allogeneic RBCs, the antibody screening and cross-matching issues of the globulin phase were resolved. The method used in this case is meaningful in that it can be easily used when drug interference occurs in a blood bank. (Korean J Blood Transfus 2023;34:26-31)
ABSTRACT
BACKGROUND: The management of red blood cell inventory in hospital's blood bank is crucial. The Australian Red Cross Blood Service developed a RBC safety stock calculation method (abbreviated as the ‘Australian formula’). In this study, we applied this method to four Korean hospitals to calculate the safe RBC stock level. METHODS: The hospitals included in this study were three tertiary teaching hospitals and one teaching hospital. The number of hospital beds in these hospitals were 1093, 1330, 1400, and 854, respectively. The data were collected from the Korea Blood Inventory Monitoring System of Centers for Disease Control & Prevention. The target/minimal/maximal RBC inventory levels and inventory days (inventory level/average daily usage) by ABO blood types were calculated using the daily red cell transfusion, wastage, and supply data between May and October 2016. RESULTS: The enrolled hospitals showed different levels for the target/minimal/maximal RBC inventory according to each blood group. The average of RBC inventory days in the four hospitals was 4.2 days. For each blood group, RBC inventory days were 3.2~4.4 days for O blood group type, 3.5~4.7 days for A blood group, 3.9~4.5 days for B blood group, and 3.9~5.5 days for AB blood group. CONCLUSION: Because the optimal RBC inventory levels are different depending on the hospital characteristics and the ABO blood group, it is necessary to set the RBC inventory levels for each hospital distinctly. The data obtained in this study will help manage blood product inventory in various hospital blood banks.
Subject(s)
Blood Banks , Erythrocytes , Hospitals, Teaching , Korea , Methods , Red CrossABSTRACT
Living overseas affects heath significantly. This needs to be addressed adequately for Japanese who live in the U. S. based on the existing evidence of negative impacts on health such as increased coronary heart disease mortality and stress. In addition to care at individual level as primary care providers, community-oriented primary care (COPC) provides primary care physicians with great potential to use as a tool of community medicine to improve their health at the community level. In this article, we report our case of COPC activity ; defining the community, choosing the health issue, implementing an intervention and its initial evaluation as well as the process of involving the community targeting Japanese in Pittsburgh, USA. The present article also includes a hypothesis-driven research question, measurement, analysis and the results followed by discussion with the lessons learned through our COPC activities. This article will not only inform readers of the COPC case but also provide practical and applicable insight to community medicine in readers' settings.