Volume 50, Issue 6 pp. 1185-1195

Duration of red blood cell storage and survival of transfused patients (CME)

Gustaf Edgren

Gustaf Edgren

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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Mads Kamper-Jørgensen

Mads Kamper-Jørgensen

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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Sandra Eloranta

Sandra Eloranta

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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Klaus Rostgaard

Klaus Rostgaard

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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Brian Custer

Brian Custer

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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Henrik Ullum

Henrik Ullum

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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Edward L. Murphy

Edward L. Murphy

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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Michael P. Busch

Michael P. Busch

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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Marie Reilly

Marie Reilly

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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Mads Melbye

Mads Melbye

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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Henrik Hjalgrim

Henrik Hjalgrim

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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And Olof Nyrén

And Olof Nyrén

From the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; the Department of Epidemiology Research, Statens Serum Institut, and the Department of Clinical Immunology, Center of Clinical Investigation, Copenhagen University Hospital, Copenhagen, Denmark; the Blood Systems Research Institute and the Department of Laboratory Medicine, University of California, San Francisco, California; and the Pharmaceuticals Outcomes Research and Policy Program, University of Washington, Seattle, Washington.

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First published: 01 June 2010
Citations: 116
Dr Gustaf Edgren, Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Box 281, SE-171 77, Stockholm, Sweden; e-mail: [email protected].

This study was funded by the National Heart, Lung, and Blood Institute of the U.S. National Institutes of Health (N01-HB-47174). The creation of the SCANDAT database was funded by the National Heart, Lung, and Blood Institute and the National Cancer Institute of the U.S. National Institutes of Health (N01-CP-21175). GE has received funding through a postdoctoral stipend from Svenska Sällskapet för Medicinsk Forskning (SSMF). MKJ and HH have received funding from the Danish Medical Research Council (271-08-0831). ELM has received a career development award (K24-HL-75036) from the U.S. National Heart, Lung, and Blood Institute. The funding organization did not participate in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.

Abstract

BACKGROUND: Disquieting reports of increased complication and death rates after transfusions of red blood cells (RBCs) stored for more than 14 days prompted us to perform an observational retrospective cohort study of mortality in relation to storage time.

STUDY DESIGN AND METHODS: We conducted a cohort study utilizing data on all recipients of at least one RBC transfusion in Sweden and Denmark between 1995 and 2002, as recorded in the Scandinavian Donations and Transfusions (SCANDAT) database. Relative risks of death in relation to storage time were estimated using Cox regression, adjusted for several possible confounding factors.

RESULTS: After various exclusions, 404,959 transfusion episodes remained for analysis. The 7-day risk of death was similar in all exposure groups, but a tendency for a higher risk emerged among recipients of blood stored for 30 to 42 days (hazard ratio, 1.05; 95% confidence interval [CI], 0.97-1.12), compared to recipients of blood stored for 10 to 19 days. With 2-year follow-up, this excess remained at the same level (hazard ratio, 1.05; 95% CI, 1.02-1.08). No dose-response pattern was revealed and no differential effect was seen when the analyses were restricted to recipients of leukoreduced units only.

CONCLUSION: Although a small excess mortality was noted in recipients of the oldest RBCs, the risk pattern was more consistent with weak confounding than with an effect of the momentary exposure to stored RBCs. It seems, thus, that any excess mortality conferred by older RBCs in the combined Swedish and Danish transfusion recipient population is likely less than 5%, which is considerably smaller than in the hitherto largest investigation.

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