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Difficulty: MediumSurgical and Procedural Interventions

A 68-year-old woman is evaluated in the preoperative clinic prior to an elective laparoscopic partial colectomy for recurrent diverticulitis. Her medical history is significant for a mechanical mitral valve replacement placed 4 years ago and a deep vein thrombosis 8 years ago. She currently takes warfarin and an angiotensin-converting enzyme (ACE) inhibitor. Her vital signs are within normal limits. Her international normalized ratio (INR) today is 2.8. The surgery is scheduled for 7 days from today. What are the mandatory perioperative management steps for this patient? (Select all that apply)

  1. Discontinuation of warfarin 5 days prior to the planned surgeryAnswer
  2. Initiation of therapeutic-dose bridging anticoagulation once the INR falls below the therapeutic rangeAnswer
  3. C
    Administration of fresh frozen plasma the evening before surgery to rapidly normalize the coagulation profile
  4. D
    Continuation of the angiotensin-converting enzyme inhibitor on the morning of the procedure
  5. E
    Routine screening with bilateral lower extremity venous duplex ultrasound to rule out recurrent venous thromboembolism

Answer

The correct steps are discontinuing warfarin 5 days prior to surgery and initiating therapeutic-dose bridging anticoagulation when the INR falls below the therapeutic range.
Patients with mechanical mitral valves are at high risk for fatal thromboembolic events and require continuous anticoagulation. However, for major abdominal surgery, the bleeding risk is also high. The evidence-based standard of care is to stop warfarin 5 days before the procedure to allow the INR to drop below 1.5, reducing surgical bleeding risk. Due to the high risk of valve thrombosis, therapeutic bridging anticoagulation must be initiated as soon as the INR falls below the therapeutic range and should be discontinued 24 hours prior to the surgical incision.

Step-by-Step Solution

1
Assess the patient's thromboembolic risk profile.
The patient has a mechanical mitral valve, placing her at high risk for thromboembolism if anticoagulation is stopped.
Identifying high-risk patients determines the need for perioperative bridging therapy.
2
Determine the appropriate timing for warfarin cessation.
Warfarin must be stopped 5 days before the scheduled elective surgery.
This duration allows sufficient time for the INR to normalize (fall below 1.5), significantly reducing the risk of intraoperative hemorrhage.
3
Implement the bridging protocol.
Therapeutic low-molecular-weight heparin or unfractionated heparin should be started once the INR becomes subtherapeutic.
Bridging maintains systemic anticoagulation to protect against valve thrombosis while warfarin is clearing from the patient's system.
4
Review other chronic medications for perioperative contraindications.
The ACE inhibitor should be held 24 hours prior to the procedure.
To prevent refractory vasoplegia and intraoperative hypotension associated with general anesthesia.

Key Concept

Perioperative optimization for high-risk patients requires discontinuing warfarin 5 days prior to surgery, utilizing bridging anticoagulation to prevent thromboembolism, and holding ACE inhibitors to avoid intraoperative hypotension.
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Topics

Surgical and Procedural Interventions

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