Effects of allogeneic leukocytes in blood transfusions during cardiac surgery on inflammatory mediators and postoperative complications.
ABSTRACT To investigate whether the higher prevalence of postoperative complications in cardiac surgery after transfusion of leukocyte-containing red blood cells can be related to inflammatory mediators.
Analysis of inflammatory markers interleukin-6, interleukin-10, interleukin-12, and procalcitonin in patients participating in a randomized trial comparing leukocyte-depleted with leukocyte-containing, buffy-coat-depleted red blood cells.
Two university-affiliated hospitals in the Netherlands.
A total of 346 patients undergoing cardiac valve surgery with a complete series of pre- and postoperative blood samples.
There were no differences in the cytokines and procalcitonin concentrations between both study arms when the patients arrived in the intensive care unit. In subgroups, patients who received zero to three red blood cell transfusions showed similar cytokine concentrations in both study arms, whereas patients with > or = 4 red blood cell transfusions had significantly higher interleukin-6 concentrations in the leukocyte-containing, buffy-coat-depleted red blood cell group. Patients who developed postoperative infections and multiple organ dysfunction syndrome showed, respectively, increased concentrations of interleukin-6 and interleukin-12 in the leukocyte-containing, buffy-coat-depleted, red blood cell group. The interaction tests in these subgroups showed significantly different reaction patterns in the leukocyte-containing, buffy-coat-depleted red blood cell group compared with leukocyte-depleted red blood cell group for interleukin-6 and interleukin-12. Multivariate analysis showed a high interleukin-6 concentration with multiple organ dysfunction syndrome and both high interleukin-6 and interleukin-10 concentrations with hospital mortality.
Allogeneic leukocyte-containing blood transfusions compared with leukocyte-depleted blood transfusions induce dose-dependent significantly higher concentrations of proinflammatory mediators in the immediate postoperative period after cardiac surgery. High concentrations of interleukin-6 are strong predictors for development of multiple organ dysfunction syndrome, whereas both interleukin-6 and interleukin-10 are associated with hospital mortality. These findings suggest that leukocyte-containing red blood cells interfere with the balance between postoperative proinflammatory response, which may further affect the development of complications after cardiac surgery.
Full-textDOI: · Available from: YM Bilgin, May 29, 2015
[Show abstract] [Hide abstract]
ABSTRACT: Background Transfused blood may have immunomodulatory and proinflammatory effects. We report the first randomized study exploring whether leukoreduced red blood cell (RBC) transfusion increases circulating proinflammatory mediators, markers of neutrophil activation, and the acute-phase response in critically ill adults.Study Design and Methods Eighty-four patients were recruited from six general intensive care units in the United Kingdom as part of a laboratory study nested within a parallel-group randomized trial comparing restrictive and liberal leukoreduced RBC transfusion strategies in critically ill patients aged more than 55 years with measured hemoglobin concentrations of not more than 90 g/L (ClinicalTrials.gov NCT00944112). Forty-one patients received transfusion and 43 did not receive transfusion. Plasma was sampled at baseline, 6 hours, and 24 hours after randomization or transfusion, and concentrations of interleukin (IL)-1β, IL-2, IL-4, IL-5, IL-6, IL-8, IL-10, IL-12-p70, interferon-γ, tumor necrosis factor-α, human neutrophil elastase, soluble L-selectin, and C-reactive protein were measured using cytokine bead array analysis and an enzyme-linked immunosorbent assay.ResultsPatients who received transfusion did not have significantly different inflammatory biomarker plasma concentrations at the time points compared to those who did not receive transfusion, with the exception of IL-8 concentrations at 24 hours, which were reduced in the transfused group (p = 0.02). After adjustment for baseline inflammatory biomarker concentrations, there were no significant differences between patients who received transfusion and those who did not.Conclusion Concentrations of measured biomarkers were not significantly increased during the first 24 hours after leukoreduced RBC transfusion. These data do not support the contention that leukoreduced RBC transfusion is associated with a proinflammatory response in the general adult critically ill population.Transfusion 06/2014; 54(10). DOI:10.1111/trf.12669 · 3.57 Impact Factor
[Show abstract] [Hide abstract]
ABSTRACT: Objective To evaluate the effect of leukoreduction (LR) as compared to standard nonleukoreduced (NLR) units on cytokine concentrations in canine erythrocyte concentrates during regular storage time.DesignRandomized, experimental study.SettingUniversity teaching hospital.AnimalsTen random-source research dogs.InterventionsOne unit of whole blood was collected from each dog and randomized to standard processing (NLR, n = 5) or prestorage LR (n = 5). All units were stored at 4°C. Samples were aseptically collected from each unit weekly for 5 weeks. On day 35, 1 mL of blood was collected from each unit and submitted for aerobic culture.Measurement and Main ResultsAn ELISA assay was used to analyze the concentrations of IL-1β, IL-8, TNF-α, and IL-10. There were no significant effects of either group or storage time for IL-1β, IL-10, or TNF-α. IL-8 concentration was significantly increased over the storage period in NLR units, and was significantly higher compared to LR units on days 28 and 35. Aerobic culture was negative on all units.Conclusions This study demonstrated a marked, storage time-dependent accumulation of IL-8 in canine erythrocyte concentrates. Prestorage LR attenuated the accumulation of IL-8. This chemokine may contribute to the proinflammatory effects of transfusion of stored erythrocyte concentrates.04/2014; DOI:10.1111/vec.12160
Conference Paper: Learning methods in space technology[Show abstract] [Hide abstract]
ABSTRACT: To begin, we must agree on what we mean by a learning system and a learning control system. A system is called learning if the information pertaining to the unknown features of a process or its environment is acquired by the system, and the obtained experience is used for future estimation, recognition, classification, decision or control such that the performance of the system will be improved. A learning system is called a learning control system if the acquired information is used to control a process with unknown features (these standardized definitions are taken from Reference 1). The attribute of "learning" that is associated with learning systems, derives from psychological learning theories, especially reinforcement learning theories.Decision and Control including the 13th Symposium on Adaptive Processes, 1974 IEEE Conference on; 01/1974