Oral anticoagulation in surgical procedures: risks and recommendations.

Area of Science:

• Cardiology
• Vascular Surgery
• Pharmacology

Background:

• Managing anticoagulation therapy during surgery presents a significant clinical challenge.
• Discontinuing or reversing anticoagulation (e.g., coumarin) to mitigate bleeding risks can increase thromboembolic events.
• A comprehensive understanding of perioperative complication frequencies is crucial for patient safety.

Purpose of the Study:

• To determine the incidence of bleeding and thromboembolic complications in patients undergoing routine surgery while on anticoagulation.
• To investigate the influence of patient characteristics and anticoagulation levels on these perioperative outcomes.

Main Methods:

• A retrospective study of 603 patients treated at Leiden Anticoagulation Clinic for mechanical heart valves, atrial fibrillation, or myocardial infarction between 1994 and 1998.
• Patients underwent routine surgery at Leiden University Medical Centre.
• Outcome events (bleeding, thromboembolism) were monitored during the perioperative period.

Main Results:

• An overall complication rate of 11.9% was observed (9.5% bleeding, 2.5% thromboembolism).
• Younger patients and those with atrial fibrillation showed a trend towards higher complication rates.
• High postoperative anticoagulation levels (International Normalized Ratio > 3) were associated with a slightly increased risk.

Conclusions:

• Routine surgery in anticoagulated patients is associated with substantial perioperative bleeding and thromboembolic risks.
• While patient factors and anticoagulation levels showed some association, the type of surgery, particularly thoracic surgery, was a significant risk determinant.