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Decreased Erythrocyte Deformability After Transfusion and the Effects of Erythrocyte Storage Duration

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National Institutes of Health Anesth Analg. Author manuscript; available in PMC 2014 May 1. Published in final edited form as: Anesth Analg. 2013 May; 116(5): 975–981. Published online 2013 Feb 28. doi: 10.1213/ANE.0b013e31828843e6 PMCID: PMC3744176 NIHMSID: NIHMS447000 PMID: 23449853

Decreased Erythrocyte Deformability After Transfusion and the Effects of Erythrocyte Storage Duration

Steven M. Frank, MD, Bagrat Abazyan, MD, Masahiro Ono, MD, Charles W. Hogue, MD, David B. Cohen, MD, MPH, Daniel E. Berkowitz, MD, Paul M. Ness, MD, and Viachaslau M. Barodka, MD

Steven M. Frank

Department of Anesthesiology/Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland

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Bagrat Abazyan

Department of Anesthesiology/Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland

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Masahiro Ono

Department of Surgery; Division of Cardiac Surgery, The Johns Hopkins Medical Institutions, Baltimore, Maryland

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Charles W. Hogue

Department of Anesthesiology/Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland

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David B. Cohen

Department of Orthopedic Surgery, The Johns Hopkins Medical Institutions, Baltimore, Maryland

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Daniel E. Berkowitz

Department of Anesthesiology/Critical Care Medicine and Biomedical Engineering, The Johns Hopkins Medical Institutions, Baltimore, Maryland

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Paul M. Ness

Department of Pathology, The Johns Hopkins Medical Institutions, Baltimore, Maryland

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Viachaslau M. Barodka

Department of Anesthesiology/Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland

Find articles by Viachaslau M. Barodka Author information Copyright and License information Disclaimer Steven M. Frank, Department of Anesthesiology/Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland; Contributor Information. Corresponding Author: Steven M. Frank, MD Department of Anesthesiology/Critical Care Medicine The Johns Hopkins Medical Institutions, Baltimore, Maryland 1800 Zayed – Room 6208 Baltimore, Maryland 21287 Phone: 410-955-8465 Fax: 410-955-0994 [email protected] Copyright notice The publisher's final edited version of this article is available at Anesth Analg See other articles in PMC that cite the published article.

Abstract

Background

Erythrocyte cell membranes undergo morphologic changes during storage, but it is unclear whether these changes are reversible. We assessed erythrocyte cell membrane deformability in patients before and after transfusion to determine the effects of storage duration and whether changes in deformability are reversible after transfusion.

Methods

Sixteen patients undergoing posterior spinal fusion surgery were studied. Erythrocyte deformability was compared between those who required moderate transfusion (≥5 units erythrocytes) and those who received minimal transfusion (0–4 units erythrocytes). Deformability was measured in samples drawn directly from the blood storage bags before transfusion, and in samples drawn from patients before and after transfusion (over 3 postoperative days). In samples taken from the blood storage bags, we compared deformability of erythrocytes stored for a long duration (≥21 days), those stored for a shorter duration (<21 days), and cell-salvaged erythrocytes. Deformability was assessed quantitatively using the elongation index (EI) measured by ektacytometry, a method which determines the ability for the cell to elongate when exposed to shear stress.

Results

Erythrocyte deformability was significantly decreased from the preoperative baseline in patients after moderate transfusion (EI decreased by 12±4 to 20±6 %) (P = 0.03) but not after minimal transfusion (EI decreased by 3±1 to 4±1 %) (P = 0.68). These changes did not reverse over 3 postoperative days. Deformability was significantly less in erythrocytes stored for ≥21 days (EI = 0.28±0.02) than in those stored for <21 days (EI = 0.33±0.02) (P = 0.001) or those drawn from patients preoperatively (EI = 0.33±0.02) (P = 0.001). Cell-salvaged erythrocytes had intermediate deformability (EI = 0.30±0.03) that was greater than that of erythrocytes stored ≥21 days (P = 0.047), but less than that of erythrocytes stored <21 days (P = 0.03).

Conclusions

The findings demonstrate that increased duration of erythrocyte storage is associated with decreased cell membrane deformability and that these changes are not readily reversible after transfusion.

Introduction

Blood transfusion, the most commonly performed procedure in United States hospitals,a has been associated with adverse outcomes in some clinical situations. Although most outcome studies of transfusion are retrospective and thus subject to confounding variables, a growing body of evidence, albeit controversial, indicates that transfusion, especially with blood stored for a long duration, may not improve oxygen delivery1,2 and may be associated with increased morbidity and mortality.3,4 Of primary concern is the quality of transfused erythrocytes after storage, because multiple biochemical and biomechanical changes occur in the cells that adversely influence erythrocyte function.5,6 These changes, referred to as the “storage lesion” have been recognized for more than two decades.7 One particular erythrocyte characteristic that is susceptible to change during storage is the ability for the cell membrane to deform, which allows erythrocytes (6–8 μm in diameter) to traverse capillaries of similar, or even smaller diameter (5– 10 μm).8

The various components of the storage lesion include depletion of nitric oxide,9 2,3-diphosphoglycerate (DPG),10 and adenosine triphosphate (ATP);11 increased free hemoglobin concentration from hemolysis;9 and increased erythrocyte aggregability.12 Storage-related changes in cell membrane structure and function include membrane phospholipid vesiculation,13 protein oxidation,14 lipid peroxidation,15 and loss of cell membrane deformability.16 Although decreased deformability has been described after erythrocyte storage, the mechanism is poorly understood. Because nitric oxide and ATP levels are thought to maintain and enhance cell membrane deformability,17-19 and given that nitric oxide and ATP are quickly replenished after transfusion of erythrocytes,20,21 it is possible that the loss of deformability is reversible. In this study, we tested the hypotheses that longer duration of erythrocyte storage is associated with loss of cell membrane deformability and that this change is reversible after transfusion.

Methods

Patient and Anesthetic Management

After receiving IRB approval (Johns Hopkins Hospital) and written informed consent, we enrolled 16 patients scheduled for posterior cervical, thoracic and/or lumbar spinal fusion surgery. Exclusion criteria included sickle cell disease or other red blood cell disorders. Intraoperative care was standardized, and all patients received general anesthesia with a combination of midazolam, fentanyl, isoflurane, nitrous oxide, and vecuronium. Intraoperatively, both allogeneic and cell-salvaged erythrocyte units were given to maintain hemoglobin concentration above 9 g/dL. Duration of erythrocyte storage was not controlled and was based on the usual practice at our institution for which the average storage duration is approximately 18 days. The a priori definition of moderate transfusion was ≥5 units (~ one-half of total blood volume) of either allogeneic or cell-salvaged erythrocytes given intraoperatively. Any intraoperative transfusion of 0–4 units was defined as minimal transfusion. In the first 3 postoperative days, erythrocytes were transfused at the discretion of the surgical team to maintain the hemoglobin concentration above 9 g/dL.

All patients had radial arterial catheters that were used for obtaining blood samples during and after surgery. Blood samples were drawn from the patient into heparinized syringes before incision, upon completion of surgery, and on the morning of postoperative days 1, 2, and 3. After the arterial catheter was removed, venous samples were obtained by phlebotomy. A sample was drawn directly from the blood storage bag for most of the blood units that were transfused during surgery (including cell-salvaged units). Samples were stored on ice until the end of surgery and then taken promptly to the laboratory where the deformability tests were performed. The duration of storage for each transfused unit was recorded. Duration of storage was calculated according to the expiration date of Adsol-preserved units; the storage duration limit was 42 days. Thirteen (87%) of 15 cell-salvaged blood units, and 36 (68%) of 53 allogeneic blood units, were tested for deformability.

Ektacytometry

To standardize measurements with regard to temperature, all blood samples were allowed to warm to room temperature, and measurements were made using prewarmed cuvettes (37°C) for all samples. Erythrocyte deformability was measured with a microfluidic slit-flow ektacytometer (Rheo Meditech, Seoul, South Korea). The principle behind this measurement has been described in detail.22 For deformability measurements, erythrocytes were suspended (final hematocrit ~ 0.5%) in a highly viscous polyvinylpyrrolidone solution (viscosity ~30 cP) with slow mixing and then loaded onto a sample reservoir of a microfluidics chip. During operation, a vacuum-generating mechanism allowed the sample to flow toward the waste reservoir through the micro-channel at a range of shear stresses (0.5 to 20 Pa), while the elliptical diffraction patterns of the flowing cells were generated by a laser beam (wavelength = 635 nm from a 1.5 mW laser diode) focused onto the micro-channel. Deformability is expressed as elongation index (EI), which was defined as (L − W)/(L + W), where L and W are the major and minor axes of the ellipse, respectively, at various shear stress values. The EI values used for analysis were those measured at the shear stress level of 3 Pa, as suggested by Baskurt.23

Data Analysis

The percentage change in the EI from the preoperative baseline measurement was used to assess erythrocyte deformability after surgery in patients who received minimal or moderate transfusion. Differences within groups and between groups were analyzed by repeated measures ANOVA with a Tukey-Kramer post hoc test for multiple comparisons of means. We compared mean EI for units with a long storage duration (≥21 days), units with a short storage duration (<21 days), and cell-salvage units to the EI of preoperative patient blood samples using a one-way ANOVA and unpaired Students t-tests. Dichotomous variables were analyzed by the Chi squared test. All data are presented as mean ± SD, and P < 0.05 was used to define significance.

Results

Intraoperatively, six patients received moderate transfusion (5–15 erythrocyte units), and 10 patients received minimal transfusion (0–3 erythrocyte units; Table 1). The mean duration of storage for erythrocyte units was 22 ± 4 days for units given to the moderately transfused patients, and 25 ± 5 days for units given to the minimally transfused patients (P = 0.23). In total, the 16 patients received 53 units of allogeneic and 13 units of cell-salvaged erythrocytes (~250 mL per unit) during surgery. Postoperatively, the average number of units transfused was 2.4 ± 1.3 in the moderate transfusion group and 0.8 ± 0.6 in the minimal transfusion group. The duration of storage for these units was 24 ± 10 and 32 ± 12 days, in the moderate and minimal transfusion groups, respectively (P = 0.19).

Table 1

Demographic Data and Intraoperative Allogeneic and Cell Salvage Blood Transfusion Requirements

PatientAgeSexSurgical ProcedureMinimal orNo. ofNo. ofMean (range) Number(yrs)ModerateIntraoperativeAlIntraoperatiDuration of Transfusionlogeneic RBCve CellStorage for UnitsSalvageAllogeneic TransfusedUnits*RBCs (days) Transfused#1 56 M T7 - L4 Thoracolumbar fusion Moderate 13 2 18 ± 8 (12-33) #2 67 M T11 - S2, Thoracolumbosacral Moderate 9 3 20 ± 5 (15-24) fusion #3 49 F T - S1 Thoracolumbar fusion Moderate 7 2 28 ± 5 (22-38) #4 68 F T3 - S1 Thoracolumbar fusion Moderate 6 1 18 ± 1 (17-20) #5 64 F T11 - S1 Thoracolumbar Moderate 5 1 31 ± 2 (28-32) fusion #6 51 M L2 - L5 Lumbar fusion Moderate 4 1 25 ± 1 (20-26) #7 58 F 7C - T1 Cervical thoracic Minimal 3 0 19 ± 8 (14-28) fusion #8 42 M T11 - L5 Thoracolumbar fusion Minimal 2 1 40 ± 0 (40, 40) #9 35 F T6 - T9 Thoracic fusion Minimal 2 0 27 ± 2 (25-28) #10 39 M L2 - L5 Lumbar fusion Minimal 1 2 18 ± 0 (18) #11 63 M L1 - L4 Lumbar fusion Minimal 1 0 20 ± 0 (20) #12 48 F C4 - C7 Cervical fusion Minimal 0 0 - #13 68 F T1 - T4, Thoracic fusion Minimal 0 0 - #14 45 F T2 - L2 Thoracolumbar fusion Minimal 0 0 - #15 42 M L5 - S1 Lumbar fusion Minimal 0 0 - #16 48 F L2 - L5 Lumbar fusion Minimal 0 0 - Open in a separate window *Each unit was 250 mL.

RBC = erythrocyte

To illustrate the data acquired by ektacytometry, representative curves were plotted to show the measured EI at each shear stress value for four different individual blood samples taken from a preoperative patient, an allogeneic blood unit stored for a short duration (14 days), a cell-salvaged blood unit, and a blood unit stored for a long duration (38 days; Fig. 1). The accepted standard for assessing deformability at 3 Pa of shear stress is indicated and is approximately the halfway point to the maximum EI, which was measured at the highest level of shear stress (20 Pa). Of these four samples, the most deformable erythrocytes were from the preoperative patient blood sample, followed by erythrocytes stored for 14 days and the cell-salvaged erythrocytes; the least deformable erythrocytes were those stored for 38 days.

Open in a separate window Fig. 1

Representative curves plotting the elongation index (EI) at increasing levels of shear stress as measured by ektacytometry. Erythrocytes with a greater EI are more deformable and thereby can transition from the normally round-shaped cell to an elongated, elliptical-shaped cell when subjected to shear stress.

For patients who required moderate transfusion, the mean EI decreased significantly from that measured preoperatively (baseline) to that measured at the end of surgery (12±4 % decrease inEI) (P = 0.03). This difference persisted in the moderately transfused patients without additional significant change on postoperative days 1, 2, and 3 (Fig. 2). The maximum decrease in EI from baseline was 20±6 %, on postoperative day 3. This decrease in EI was statistically significant between and within the moderate and minimal transfusion groups (P = 0.008). The changes in EI for patients who required minimal transfusion were small (3±1 to 4±1 % decrease in EI), and not significantly different from preoperative measurements (P = 0.68).

Open in a separate window Fig. 2

Erythrocytes drawn from patients who underwent moderate blood transfusion (≥5 units) exhibited a greater decrease in elongation index (EI) (loss of deformability) compared to erythrocytes drawn from patients who underwent minimal transfusion (0–3 blood units). The EI was significantly lower at the end of surgery than at the preoperative baseline (P = 0.03), and this decreased deformability persisted through postoperative day (POD) 3. The small decrease in deformability from baseline in the minimal transfusion group over the 3-day period was not significant. Overall, the differences between and within groups were statistically significant (P = 0.008). *Significantly different from preoperative patient blood and minimal transfusion group.

The mean EI for samples drawn directly from the allogeneic blood units stored ≥21 days, units stored <21 days, and cell-salvaged units, were compared to the mean EI from preoperative patient blood samples (Fig. 3). The differences among groups were significant (P = 0.008). When individual means were compared, the mean EI for erythrocytes stored ≥21 days (EI = 0.28±0.02) was significantly less than that for both erythrocytes stored <21 days (EI = 0.33±0.02) (P = 0.001) and erythrocytes drawn preoperatively (EI = 0.33±0.02) (P = 0.001). The EI for cell-salvaged erythrocytes (EI = 0.30±0.03) was significantly greater than that for erythrocytes stored ≥21 days (P = 0.047) but less than that for both preoperative patient erythrocytes (P = 0.01), and erythrocytes stored <21 days (P = 0.03).

Open in a separate window Fig. 3

Comparison of erythrocyte elongation index (EI) in blood drawn preoperatively (preop), in cell salvage blood, and in allogeneic blood units stored for ≥21 days or <21 days. A greater EI indicates a more deformable erythrocyte cell membrane. The differences among the four groups were significant (P = 0.008). Deformability for erythrocytes stored for the longer duration (≥21 days) was significantly less than that for erythrocytes stored <21 days (P = 0.001) and erythrocytes drawn from patients preoperatively (P = 0.001). Deformability for cell salvage erythrocytes was significantly greater than that of erythrocytes stored ≥21 days (P = 0.047) and less than that of both preoperative patient blood (P = 0.01) and blood stored <21 days (P = 0.03). *Significantly less than preoperative patient blood and blood stored <21 days; #significantly less than preoperative patient blood and blood units of <21 day storage duration, and significantly greater than blood units of ≥21 day storage duration.

The EI measured in samples taken from units of blood transfused intraoperatively was plotted against storage duration (Fig. 4). The preoperative patient blood samples (0 days’ storage) are plotted on the left side of the figure, and each sample from the transfused blood units is shown on the right side. There was a statistically significant and progressive decrease in the EI with increasing storage duration, with a drop-off at approximately 20 days of storage. The majority (15 of 17, 88%) of samples drawn from blood units stored <21 days had values higher than 0.30, whereas the majority (12 of 19, 63%) of units stored ≥21 days had measured values below 0.30 (P=0.002).

Open in a separate window Fig. 4

Comparison of erythrocyte deformability in preoperative patient blood, blood units stored for a short duration (12–20 days), and blood units stored for a long duration (21–40 days). Loss of deformability as measured by ektacytometry is indicated by a decreased elongation index (EI). Erythrocyte deformability was significantly less in samples drawn from blood units of longer storage duration than in samples drawn from preoperative patient blood or samples drawn from blood units with shorter storage duration. *P = 0.001 compared to preoperative patient blood and blood units stored 12–20 days.

Discussion

The results indicate that erythrocytes from moderately transfused patients are significantly less deformable postoperatively than those from minimally transfused patients. The finding of impaired deformability did not reverse over a 3-day period, contrary to our hypothesis. Additionally, erythrocytes stored ≥21 days were less deformable than erythrocytes stored for a shorter duration or fresh erythrocytes from preoperative blood samples. Cell-salvaged erythrocytes had intermediate deformability that was between that of fresh erythrocytes and that of erythrocytes stored for ≥21 days, suggesting that they may undergo some detrimental changes during the cell salvage processing procedure. Another explanation for this finding may be that a significant proportion of the cell-salvaged erythrocytes were actually a mixture of older and younger allogeneic transfused cells and native patient erythrocytes that were shed during bleeding and recovered by the cell-salvage system.

The biochemical changes that occur during blood storage, such as depletion of nitric oxide, 2,3-DPG, and ATP, are rapidly reversed after stored erythrocytes are transfused back into the circulation. Nitric oxide, which is thought to contribute to the maintenance of normal deformability,17,18 is replenished rapidly (within hours),24 and ATP concentrations recover within 2 days.20 The effects of storage on cell membrane properties are less well understood. The cell membrane undergoes multiple storage-related changes, including oxidative damage to the spectrin-actin-protein complex,14 which binds the phospholipid bilayer of the red cell cytoskeleton and leads to microvesiculation of the cell membrane.25,26 Lipid peroxidation also occurs,15 and all of these changes have been associated with loss of membrane deformability.19 Our findings suggest that the structural cell membrane changes associated with storage, unlike the biochemical changes, may be irreversible. The further decline in deformability over the first 3 postoperative days in the moderately transfused patients, although not a statistically significant change from the “end-of-surgery” measurement, may be related to the greater number of postoperative transfused blood units (2.8 units) compared to the minimally transfused patients (0.8 units), and the fact that the average age of these units was 24 days.

One particular feature of the storage lesion is the presence of spherocytes and echinocytes, which become prevalent after 2 weeks of storage.26 These shape changes are associated with loss of deformability as measured by filterability,5,27 ektacytometry,28 and increased osmotic fragility,29 and this decreased deformability is associated with decreased erythrocyte survival.30 Storage has also been associated with an increased inflammatory response,31 increased endothelial adhesion32 and a decrease in microvascular flow.33 These changes are thought to become significant even after short (7-14 days) duration of storage.34 Animal2,35 and human36 studies have shown that transfusion with erythrocytes that have been stored for a long duration delivers less oxygen to the intestinal mucosa than transfusion with fresh erythrocytes. These studies illustrate that blood cells with lengthy storage times do not improve oxygen delivery at the tissue level and may predispose patients to tissue hypoxia.

Whether longer storage duration is related to adverse clinical outcomes is a topic of significant controversy. A meta-analysis that was published recently included 21 studies and more than 400,000 patients and had as its primary outcome death within 30 days or during the hospitalization.3 Overall, transfusion of blood that had been stored for longer periods was associated with increased mortality (odds ratio = 1.16, P = 0.0001). The studies included in the meta-analysis generally defined older blood as that which had been stored for longer than 14–21 days, and younger blood as that stored for less than 8–14 days. In the subgroup analyses, multiple organ dysfunction and pneumonia were increased in adult patients as a function of blood storage duration, and the increased mortality was recognized in trauma patients and in those undergoing both cardiac and noncardiac surgery. Limitations of the meta-analysis were that only three of the 21 studies were randomized clinical trials, trials that were randomized included small numbers of patients, and very old blood (4–6 weeks storage) was not used in most of the studies included.

Larger, more definitive, randomized clinical trials on blood storage duration and clinical outcomes are continuing and include the RECESS and the ABLE trials.37,38 Recently, the first large randomized trial to be completed showed no difference in outcomes in 377 neonatal patients randomized to receive fresh blood (average of 5.1 days old) or standard blood (average of 14.6 days old).39 Death rate was no different (16% in each group), and the incidence of infections and length of stay were also similar between groups. Of interest is that all of these patients received blood units of relatively shorter storage duration (compared to our study), because the investigators perceived “ethical” problems in giving blood units of longer storage duration to neonatal patients, although that was not the institutional standard of care.

Since cell-salvaged erythrocytes are not stored and are thought to be fresh, we anticipated that deformability measurements of such cells would be similar to those of preoperative patient blood samples. The finding of intermediate deformability was thus intriguing, and we can only speculate about the reasons. As previously mentioned, some of these cells may actually have been allogeneic transfused cells that were shed during bleeding, but those cells should make up a small proportion of salvaged cells, unless there is massive transfusion. Shear forces during suctioning from the surgical field as well as the effect of centrifugation during processing may cause changes in cell membrane integrity and structure.40 Although morphologic abnormalities are seen consistently in salvaged blood cells,41 24-hour survival for salvaged cells is not altered,42 and 2,3-DPG concentrations43 and the oxyhemoglobin dissociation curve44 remain normal after cell salvage. When all of these factors are considered, transfusion of cell-salvaged blood is still preferable to stored allogeneic blood, especially when cost, risk of immunologic challenge and viral transmission, and the detrimental effects of storage are considered.

Certain limitations in our study should be recognized. First, the duration of follow-up after transfusion was limited to 3 days; therefore, we are unable to determine whether additional changes to cell membrane deformability occur after this time. The posttransfusion trend, however, was in the direction of less deformability, so return to baseline with longer follow-up seems unlikely. Second, we did not randomize or control the duration of blood storage for the units that were transfused. Thus, we did not have patients who received erythrocytes of exclusively shorter or longer storage duration, and we are unable to clearly delineate whether storage duration or the number of units transfused was the primary variable associated with decreased deformability in postoperative patient blood samples. Third, we did not include blood units with very short duration of storage, simply because they are not commonly given to adults in our institution, and they were not issued to the patients in our study. Lastly, we were unable to sample every unit of transfused blood to obtain deformability measurements. Most units given intraoperatively were sampled and tested, but none of the units transfused postoperatively was tested; however, the latter is a relatively small number.

In summary, erythrocytes sampled from patients who have undergone moderate transfusion (≥ one-half of total blood volume) have decreased deformability compared to fresh erythrocytes, and this abnormality is not reversed during the subsequent 3 days. In addition, our findings suggest that storage of erythrocytes for more than 21 days has a detrimental effect on the cell membrane that causes a loss of the cell’s normal ability to deform under shear stress. Our findings also suggest that both the “dose” of blood as well as the “age of blood” are important when considering the rheological properties of circulating erythrocytes after transfusion. Reliable evidence indicates that loss of erythrocyte deformability may render the cells less effective in delivering oxygen at the tissue level, as they must traverse capillaries that are similar, or even smaller in diameter to the erythrocytes themselves. The clinical implications of these findings will not be fully evident until the ongoing large, randomized clinical trials are completed, but our findings add to the growing body of evidence that allogeneic transfusion, especially with erythrocytes that have long storage times, may not fully restore the ability of circulating blood to deliver oxygen to tissues.

Acknowledgments

Funding: Support was provided from institutional and/or departmental sources and from The New York Community Trust, New York, NY, (to SMF) and the National Institutes of Health RO1 AG021523 (to DEB) and RO1 HL092259-01 (to CWH).

Footnotes

DISCLOSURES: Name: Steven M. Frank, MD

Contribution: This author helped design the study, conduct the study, collect the data, analyze the data, and prepare the manuscript.

Attestation: Steven M. Frank approved the final manuscript. Steven M. Frank attests to the integrity of the original data and the analysis reported in this manuscript. Steven M. Frank is the archival author.

Conflicts of Interest: The author has no conflicts of interest to declare.

Name: Bagrat Abazyan, MD

Contribution: This author helped conduct the study, collect the data, analyze the data, and edit the manuscript.

Attestation: Bagrat Abazyan approved the final manuscript. Bagrat Abazyan attests to the integrity of the original data and the analysis reported in this manuscript.

Conflicts of Interest: The author has no conflicts of interest to declare.

Name: Masahiro Ono, MD

Attestation: Masahiro Ono approved the final manuscript. Masahiro Ono attests to the integrity of the original data and the analysis reported in this manuscript.

Conflicts of Interest: The author has no conflicts of interest to declare.

Name: Charles W. Hogue MD

Contribution: This author helped design the study and prepare the manuscript.

Attestation: Charles W. Hogue approved the final manuscript.

Conflicts of Interest: The author has no conflicts of interest to declare.

Name: David B. Cohen, MD, MPH

Contribution: This author helped design the study and prepare the manuscript.

Attestation: David B. Cohen approved the final manuscript.

Conflicts of Interest: The author has no conflicts of interest to declare.

Name: Daniel E. Berkowitz, MD

Contribution: This author helped design the study and prepare the manuscript.

Attestation: Dan E. Berkowitz approved the final manuscript.

Conflicts of Interest: The author has no conflicts of interest to declare.

Name: Paul M. Ness, MD

Contribution: This author helped design the study and prepare the manuscript.

Attestation: Paul M. Ness approved the final manuscript.

Conflicts of Interest: Paul M. Ness has consulted for TerumoBCT (Lakewood, Colorado) and Fenwal Labs (Lake Zurich, Illinois), both companies involved with blood storage. Nothing in this study directly benefits these companies.

Name: Viachaslau M. Barodka MD

Contribution: This author helped design the study, collect the data, analyze the data, and prepare the manuscript.

Attestation: Viachaslau M. Barodka approved the final manuscript.

Conflicts of Interest: The author has no conflicts of interest to declare.

Recuse Note: Dr. Charles W. Hogue is the Associate Editor-in-Chief for Cardiovascular Anesthesiology for the Journal. This manuscript was handled by Dr. Jerrold H. Levy, Section Editor for Hemostasis and Transfusion Medicine, and Dr. Hogue was not involved in any way with the editorial process or decision.

Reprints will not be available from the authors.

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Contributor Information

Steven M. Frank, Department of Anesthesiology/Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland.

Bagrat Abazyan, Department of Anesthesiology/Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland.

Masahiro Ono, Department of Surgery; Division of Cardiac Surgery, The Johns Hopkins Medical Institutions, Baltimore, Maryland.

Charles W. Hogue, Department of Anesthesiology/Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland.

David B. Cohen, Department of Orthopedic Surgery, The Johns Hopkins Medical Institutions, Baltimore, Maryland.

Daniel E. Berkowitz, Department of Anesthesiology/Critical Care Medicine and Biomedical Engineering, The Johns Hopkins Medical Institutions, Baltimore, Maryland.

Paul M. Ness, Department of Pathology, The Johns Hopkins Medical Institutions, Baltimore, Maryland.

Viachaslau M. Barodka, Department of Anesthesiology/Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland.

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