Evolution of antithrombin III during the postoperative period

Area of Science:

• Vascular Surgery
• Thrombosis Research
• Anesthesiology

Background:

• Deep venous thrombosis (DVT) is a significant risk following major abdominal surgery.
• Antithrombin III (AT III) plays a crucial role in regulating coagulation.
• Understanding DVT risk factors is essential for patient management.

Purpose of the Study:

• To evaluate the preoperative antithrombin III (AT III) level as a predictor of postoperative deep venous thrombosis (DVT) risk.
• To analyze the changes in AT III levels during the early postoperative period.
• To determine the relationship between AT III level evolution and DVT development.

Main Methods:

• Prospective study of 57 patients undergoing major abdominal surgery without anticoagulant prophylaxis.
• Antithrombin III (AT III) levels measured preoperatively, immediately postoperatively, and daily for 8 days.
• Bilateral radiological phlebography performed on postoperative day 8 to diagnose deep venous thrombosis (DVT).

Main Results:

• Preoperative antithrombin III (AT III) levels did not correlate with the risk of developing postoperative deep venous thrombosis (DVT).
• A significant incidence of DVT (49%) was observed in the study cohort.
• Postoperative AT III levels decreased immediately after surgery but normalized within 8 days, with no difference between DVT and non-DVT groups.

Conclusions:

• Preoperative antithrombin III (AT III) is not a reliable marker for predicting deep venous thrombosis (DVT) risk in patients undergoing major abdominal surgery.
• The observed changes in AT III levels post-surgery are not associated with the development of DVT.