Perioperative Anticoagulation Management for Pacemaker Implantation in Patients with Prosthetic Heart Valves

Introduction to Anticoagulation Management

Patients with mechanical heart valves have a high thrombotic risk that outweighs the bleeding concerns associated with pacemaker implantation 1
The American College of Cardiology/American Heart Association guidelines recommend continuing aspirin throughout the perioperative period for patients with high thrombotic risk, including those with prosthetic heart valves 1, 2

The American College of Cardiology recommends continuing aspirin (81-325 mg daily) without interruption through the perioperative period to provide essential protection against valve thrombosis, which carries significant morbidity and mortality risk 4
Aspirin therapy increases the risk of pocket hematoma slightly but is generally well-tolerated, with the risk of valve thrombosis outweighing the risk of pocket hematoma 4

Lovenox (enoxaparin) should be discontinued at least 24 hours before the pacemaker procedure to minimize bleeding risk 3
For procedures with moderate bleeding risk like pacemaker implantation, the last dose of Low Molecular Weight Heparin (LMWH) should be administered >12 hours before the procedure 3
Lovenox can be resumed 24-48 hours after the procedure, depending on hemostasis assessment, and if used for thromboprophylaxis rather than bridging, it can be resumed 24 hours after the procedure if hemostasis is adequate 3

If the patient is bridging from warfarin, resume warfarin on the evening of the procedure, and do not discontinue both anticoagulants simultaneously to avoid excessive thrombotic risk for a patient with a prosthetic valve 3, 4

Monitor the implantation site for signs of bleeding or hematoma formation, and if significant bleeding occurs, consider holding the next dose of Lovenox but continue aspirin if possible 4
Do not use Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) for post-procedure pain as they increase bleeding risk when combined with aspirin 5
Resume full anticoagulation as soon as hemostasis is adequate, and do not delay restarting anticoagulation beyond 48-72 hours to avoid increased thrombotic risk 3, 4