Late-onset adverse body reactions after blood donation are a serious problem when considering the safety of donors. However, predicting these reactions at the donation office can be difficult because their pathophysiology is poorly understood. We non-invasively monitored the cardiac output (CO) and stroke volume (SV) of 72 donors during autologous blood donation using an AESCULON mini device. The original preoperative autologous blood donation adverse reaction scale (PADARS) was used to estimate the severity of post-donation body reactions. The relationship between the total PADARS score and AESCULON mini measurements and other backgrounds was evaluated using a multivariate linear regression model. During the donation, the average decrease in CO and SV was 0.79±0.43l/min and 9.4±6.7ml, respectively. Among 30 donors who answered the questionnaire, 14 (47%) and 2 (7%) were aware of some subjective symptoms and suffered from relatively severe body reactions (score ≥ 5), respectively. A multivariate linear regression analysis revealed that age and SV value at the end of donation were inversely correlated with the total PADARS score (p < 0.05). In addition to younger age, a low post-donation SV value measured by AESCULON mini can be a risk factor for late-onset adverse body reactions.

Daratumumab (DARA), a human monoclonal antibody which targets CD38 in the treatment of multiple myeloma (MM), can interfere with the indirect antiglobulin test (IAT) due to the weak expression of CD38 on red blood cell (RBC) membranes. To eliminate this interference in pretransfusion testing, RBCs should be treated with DTT. We experienced two cases in which irregular antibodies were identified in patients treated with DARA. In case 1, anti-E was detected on testing for irregular antibodies before DARA administration, which allowed the selection of E antigen-negative RBC in advance of the transfusion test after DARA administration. In case 2, anti-C was detected after transfusion of 8 units of RBCs following receipt of DARA, even though the results of antibody screening were negative before receipt of DARA. A clinically relevant delay in the selection of compatible RBCs can be prevented in cases in which antibody screening and identification is performed before DARA administration, such as in case 1. However, a serious delay in preparing compatible blood may arise in cases in which antibodies are detected following DARA administration, such as in case 2, due to the repeated requirement of DTT treatment of RBCs in pretransfusion testing. The enzyme method may be effective in detecting Rh antibodies, due to the rare interference by DARA in this test.