Relationship between Surgery and Trauma and Risk of Recurrence in Patients with an Associated First Venous Thrombotic...

Area of Science:

• Cardiology
• Vascular Medicine
• Thrombosis Research

Background:

• Anticoagulation duration for venous thromboembolism (VTE) hinges on whether the event was provoked or unprovoked.
• Major surgery or trauma are known VTE provoking factors with low recurrence risk, but risk after minor surgery/trauma is unclear.

Purpose of the Study:

• To compare VTE recurrence rates in patients provoked by minor surgery/trauma versus major surgery/trauma.
• To investigate the magnitude of VTE recurrence risk associated with minimally provoked events.

Main Methods:

• Nested case-control study including patients with a first VTE within 90 days of surgery or trauma.
• Excluded patients with unprovoked VTE or VTE provoked by cancer/non-surgical factors.
• Calculated crude and adjusted odds ratios with 95% confidence intervals, adjusting for confounders.

Main Results:

• Recurrence incidence after VTE provoked by minor surgery (6.5%) was more than double that after major surgery (3.0%).
• This difference persisted after adjustment for known VTE risk factors.
• No significant difference in recurrence rates was observed between VTE provoked by minor versus major trauma.

Conclusions:

• VTE recurrence risk is elevated in patients whose VTE was provoked by minor surgery compared to major surgery.
• Findings support the hypothesis that minimally provoked VTE carries a higher recurrence risk than VTE provoked by major transient factors.