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Published in: Systematic Reviews 1/2021

Open Access 01-12-2021 | Anemia | Research

Role of preoperative intravenous iron therapy to correct anemia before major surgery: a systematic review and meta-analysis

Authors: Abdelsalam M. Elhenawy, Steven R. Meyer, Sean M. Bagshaw, Roderick G. MacArthur, Linda J. Carroll

Published in: Systematic Reviews | Issue 1/2021

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Abstract

Background

Preoperative anemia is a common comorbidity that often necessitates allogeneic blood transfusion (ABT). As there is a risk associated with blood transfusions, preoperative intravenous iron (IV) has been proposed to increase the hemoglobin to reduce perioperative transfusion; however, randomized controlled trials (RCT) investigating this efficacy for IV iron are small, limited, and inconclusive. Consequently, a meta-analysis that pools these studies may provide new and clinically useful information.

Methods/design

Databases of MEDLINE, EMBASE, EBM Reviews; Cochrane-controlled trial registry; Scopus; registries of health technology assessment and clinical trials; Web of Science; ProQuest Dissertations and Theses; Clinicaltrials.gov; and Conference Proceedings Citation Index-Science (CPCI-S) were searched. Also, we screened all the retrieved reference lists.

Selection criteria

Titles and abstracts were screened for relevance (i.e., relevant, irrelevant, or potentially relevant). Then, we screened full texts of those citations identified as potentially applicable.

Results

Our search found 3195 citations and ten RCTs (1039 participants) that met our inclusion criteria. Preoperative IV iron supplementation significantly decreases ABT by 16% (risk ratio (RR): 0.84, 95% confidence interval [CI]: 0.71, 0.99, p = 0.04). In addition, preoperatively, hemoglobin levels increased after receiving IV iron (mean difference [MD] between the study groups: 7.15 g/L, 95% CI: 2.26, 12.04 g/L, p = 0.004) and at follow-up >  4 weeks postoperatively (MD: 6.46 g/L, 95% CI: 3.10, 9.81, p = 0.0002). Iron injection was not associated with increased incidence of non-serious or serious adverse effects across groups (RR: 1.13, 95% CI: 0.78, 1.65, p = 0.52) and (RR: 0.96, 95% CI: 0.44, 2.10, p = 0.92) respectively.

Conclusions

With moderate certainty, due to the high risk of bias in some studies in one or two domains, we found intravenous iron supplementation is associated with a significant decrease in the blood transfusions rate, and modest hemoglobin concentrations rise when injected pre-surgery compared with placebo or oral iron supplementation. However, further full-scale randomized controlled trials with robust methodology are required. In particular, the safety, quality of life, and cost-effectiveness of different intravenous iron preparations require further evaluation.
Appendix
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Metadata
Title
Role of preoperative intravenous iron therapy to correct anemia before major surgery: a systematic review and meta-analysis
Authors
Abdelsalam M. Elhenawy
Steven R. Meyer
Sean M. Bagshaw
Roderick G. MacArthur
Linda J. Carroll
Publication date
01-12-2021
Publisher
BioMed Central
Keyword
Anemia
Published in
Systematic Reviews / Issue 1/2021
Electronic ISSN: 2046-4053
DOI
https://doi.org/10.1186/s13643-021-01579-8

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