Analysis of hematologic parameters of donors, patients, and granulocyte concentrates to predict successful granulocyte transfusion

BACKGROUND: Granulocyte transfusion (GTx) is performed as a supportive therapy in severe neutropenic patients caused by various conditions. The study aimed to analyze the hematologic parameters of donors, patients, and granulocyte concentrates to predict successful GTx. METHODS: This study was performed in 281 donors, with their granulocyte concentrates being collected through apheresis, and in 54 severe neutropenic patients who had various hematologic diseases. Complete blood cell counts of donors pre- and post-apheresis, granulocyte concentrates, and patients pre- and post-GTx were analyzed. Patients were divided into two groups according to survival at discharge (Group S, survival; Group D, dead) to compare various factors including age, infection status, pre- and post-GTx total white blood cell counts (TWBCC) and absolute neutrophil counts (ANC), total number of GTx, infused TWBCC and ANC per weight, and use of G-CSF during therapy. RESULTS: Overall data of patients showed that both TWBCC and ANC were significantly increased after GTx (median values at pre-GTx, TWBCC=0.40×109/L, ANC=0.14×109/L; post-GTx, TWBCC=0.57×109/L, ANC=0.29×109/L, both P<0.0001). After GTx, Group S (N=25) showed significantly higher TWBCC and ANC than Group D (N=29) (P=0.01 and P=0.04, respectively). Using different cutoff levels, post-GTx TWBCC greater than 0.5×109/L showed statistically significant difference between the two groups (P<0.01). None of the other factors showed statistically significant differences. CONCLUSION: The TWBCC and ANC after GTx were significant factors to predict patients' outcome. Therefore, follow-up of those two parameters may be helpful to select or consider other therapeutic modalities including additional GTx.

EDTA Treatment for Overcoming the Prozone Effect and for Predicting C1q Binding in HLA Antibody Testing

The Luminex-based single antigen bead (SAB) assay is widely used to detect HLA antibody in transplant recipients. However, one limitation of the SAB assay is the prozone effect, which occurs mostly as a result of complement interference. We investigated the efficacy of EDTA treatment for overcoming the prozone effect and predicting C1q binding of HLA antibody. We subjected 27 non-treated (naïve) and EDTA-treated serum samples from highly sensitized patients to IgG-SAB assays, and we confirmed the prozone effect in 53% and 31% of class I and class II antibody tests, respectively, after EDTA treatment. When we conducted additional assays after dithiothreitol treatment and serum dilution, EDTA was the most efficacious in eliminating the prozone effect. Reducing the prozone effect by EDTA treatment strengthened the correlation between IgG mean fluorescence intensity (MFI) and C1q MFI values (ρ=0.825) as compared with the naïve sera (ρ=0.068). Although C1q positivity was dependent on the concentration of HLA antibody in EDTA-treated sera, the correlations varied individually. Overall, our results confirmed the efficacy of EDTA treatment for overcoming the prozone effect. EDTA treatment showed a positive effect on the correlation between IgG MFI and C1q MFI values.

Evaluation of Hemoglobin Trigger and Appropriateness of Perioperative Red Cell Transfusion in Surgical Departments / 대한수혈학회지

BACKGROUND: Red blood cell (RBC) transfusion is an essential practice during surgery to accommodate for bleeding. As such, there are efforts being made to allow for a safe and appropriate transfusion due to shortages of blood components and to minimize transfusion-related adverse reactions. However, a conventional transfusion decision with relatively high hemoglobin (Hb) threshold is still performed in clinical setting. In this study, we investigated the threshold of Hblevel and appropriateness of RBC transfusion in patients receiving perioperative RBC transfusion in surgical departments. METHODS: We investigated the pre-transfusion Hb level of 1,379 patients (2,170 episodes) receiving perioperative RBC transfusion in five surgical departments, including cardiothoracic surgery (CS), general surgery (GS), neurosurgery (NS), obstetrics and gynecology (OBGY), and orthopedics (OS), between June 2017 and March 2018. The appropriateness of transfusion was evaluated with two criteria: 1) pretransfusion Hb level ≤10 g/dL and 2) posttransfusion Hb level ≤10 g/dL. RESULTS: The median pretransfusion Hb level was 8.5 g/dL (interquartile range 7.7~9.4); that of each department was as follows: 8.6 g/dL (7.9~9.2) in CS, 7.9 g/dL (7.3~8.6) in GS, 9.1 g/dL (8.5~9.8) in NS, 8.5 g/dL (7.7~9.8) in OBGY, and 8.7 g/dL (7.9~9.7) in OS. With a criteria of pretransfusion of Hb level ≤10 g/dL, 85.4% of total episodes were appropriate. With criteria of post-transfusion of Hb level ≤10 g/dL, 44.7% were appropriate. CONCLUSION: This study presents a fundamental data observing the trend of RBC transfusion in a single institution. A significant proportion of inappropriate RBC transfusion are still being conducted in surgical setting. Continuous and effective education of clinicians and implementation of monitoring systems to assess the appropriateness of RBC transfusion may be necessary.