Anticoagulants and hematomas in free flap surgery

Area of Science:

• Plastic Surgery
• Vascular Surgery
• Anesthesiology

Background:

• Systemic anticoagulation is often used in free flap procedures to prevent thrombosis.
• The optimal anticoagulant regimen and its associated risks, such as hematoma formation, require further investigation.

Purpose of the Study:

• To evaluate the risk of hematoma formation associated with systemic anticoagulant use in free flap procedures.
• To assess the impact of different anticoagulation strategies on flap outcomes, including flap loss and pedicle thrombosis.

Main Methods:

• Retrospective review of 517 free flap procedures.
• Patients were categorized into five groups based on anticoagulation strategy: no anticoagulation, low-dose heparin, intraoperative heparin bolus, high-dose heparin infusion, and dextran 40 infusion.
• Outcomes analyzed included hematoma formation, intraoperative blood loss, flap loss rate, and pedicle thrombosis rate.

Main Results:

• Hematoma rates varied across groups, with low-dose heparin (6.7%) and intraoperative bolus (6.5%) showing similar rates to no anticoagulation (5.3%). High-dose heparin infusion had the highest rate (20%).
• Flap loss and pedicle thrombosis rates were numerically lower in the low-dose and intraoperative bolus heparin groups compared to the no-anticoagulation group, but these differences were not statistically significant.
• Intraoperative blood loss was comparable across all groups.

Conclusions:

• Low-dose heparin administration in free flap surgery does not appear to significantly increase the risk of hematoma or intraoperative bleeding.
• While a causal link could not be definitively established, low-dose heparin demonstrated a trend towards improved flap viability by reducing pedicle thrombosis and flap loss.
• Further prospective studies are warranted to confirm the efficacy and safety of low-dose heparin in free flap procedures.