Background: Previous meta-analyses comparing low molecular weight heparin (LMWH) and unfractionated heparin for thrombosis prophylaxis after surgical interventions need updating.
Methods: This is a publication-based meta-analysis of 36 double-blind studies including 16583 patients. Main outcome measures are incidence of deep vein thrombosis (efficacy) and wound haematoma (safety).
Results: In general surgery there is no increased efficacy in favour of LMWH (odds ratio (OR) 0.88, 95 per cent confidence interval (c.i.) 0.60-1.30) but there exists a higher incidence of bleeding complications (OR 1.47, 95 per cent c.i. 1.07-2.01). Low-dose LMWH is equally efficacious (OR 1.03, 95 per cent c.i. 0.85-1.26) but safer than unfractionated heparin (OR 0.68, 95 per cent c.i. 0.56-0.82). In orthopaedic surgery there is a trend towards an increased efficacy for LMWH (OR 0.83, 95 per cent c.i. 0.68-1.02) with equivalent safety (OR 0.96, 95 per cent c.i. 0.68-1.36).
Conclusion: A superiority of LMWH is suggested but heterogeneity might make generalizability to future patients questionable. A meta-analysis on individual patient data should be the next step before randomizing additional patients in future trials.
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