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Preoperative acute normovolemic hemodilution: a meta-analysis
Jodi B Segal1, Elena Blasco-Colmenares, Edward J Norris
1Department of Medicine, Bloomberg School of Public Health, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA. jsegal@jhmi.edu
Transfusion
|April 24, 2004
Summary
Preoperative acute normovolemic hemodilution (ANH) shows modest benefits, with similar transfusion risks but reduced blood loss. However, its safety remains unproven, limiting widespread adoption.
Area of Science:
- Anesthesiology
- Surgical Blood Conservation
- Evidence-Based Medicine
Background:
- Acute normovolemic hemodilution (ANH) is a technique involving blood withdrawal and fluid replacement to maintain blood volume.
- Preoperative ANH aims to reduce allogeneic blood transfusions and associated risks.
Purpose of the Study:
- To systematically review and meta-analyze the efficacy and safety of preoperative ANH.
Main Methods:
- Systematic review and meta-analysis of 42 randomized controlled trials (RCTs).
- Data abstracted from MEDLINE and Cochrane Controlled Trials Database, supplemented by hand searching.
- Outcomes including allogeneic transfusion, bleeding, and adverse events were pooled using random-effects models.
Main Results:
- ANH did not significantly alter the risk of allogeneic transfusion compared to usual care or other blood conservation methods.
- Patients undergoing ANH received 1-2 fewer units of allogeneic blood and experienced less total bleeding (91 mL).
- Increased intraoperative bleeding was noted, and adverse events were reported in only one-third of studies.
Conclusions:
- Preoperative ANH offers only modest clinical benefits.
- The safety profile of ANH is not adequately established by current evidence.
- Widespread clinical adoption of ANH is not currently recommended.