Postoperative Prophylactic Anticoagulation in Flap Surgery: A Review of the Evidence and Challenging Common Beliefs.

In 30 seconds

This systematic review and meta-analysis assessed postoperative prophylactic anticoagulation and outcomes after microsurgical flap reconstruction. Across 11 studies, seven comparisons of anticoagulation with no anticoagulation found more hematomas with anticoagulation (5.0% vs. 3.0%; p = 0.03), without significant differences in flap failure or reoperation. Subgroup analyses linked increased hematoma risk to unfractionated heparin, but not LMWH. In four studies, adding aspirin to anticoagulation was associated with more reoperations (17.5% vs. 10.0%; p < 0.01), with no significant difference in flap failure.

Key findings

• Postoperative anticoagulation was associated with more hematomas than no anticoagulation (5.0% vs. 3.0%; p = 0.03).
• Flap failure and reoperation rates did not differ significantly between anticoagulated and non-anticoagulated groups.
• In subgroup analyses, unfractionated heparin was associated with increased hematoma risk; LMWH showed no significant effect.
• Adding aspirin to anticoagulation was associated with more reoperations (17.5% vs. 10.0%; p < 0.01), without a significant difference in flap failure.

Why it matters

The findings highlight a potential trade-off in postoperative flap management: anticoagulation may increase bleeding-related complications without a demonstrated improvement in flap survival. The reported differences by anticoagulant regimen and the higher reoperation rate with added aspirin underscore the importance of weighing potential harms against expected benefit rather than assuming that more prophylaxis improves flap outcomes.

What to keep in mind

The review included 11 studies, and the evidence comes from comparisons across studies rather than a single randomized trial; the abstract does not report further details on study quality or heterogeneity.