<h2>Key Takeaway</h2>
<ul>
 <li>This study shows that among surgical patients receiving post-operative enoxaparin for venous thromboembolism (VTE) prevention, those having initial low vs in-range/high anti-Factor Xa (aFXa) were at significantly higher risk for 90-day post-operative VTE.</li>
 <li>High aFXa levels were not associated with 90-day clinically relevant bleeding (CRB) or major bleeding (MB).</li>
</ul>

<h2>Why This Matters</h2>
<ul>
 <li>Despite receiving chemical anticoagulation, surgical patients are at increased risk for “breakthrough” VTE.</li>
 <li>Moreover, surgical patients exhibit variable pharmacodynamic responses to enoxaparin, which are demonstrated by differences in aFXa levels, a marker of the extent of anticoagulation.</li>
</ul>

<h2>Study Design</h2>
<ul>
 <li>This is a pooled analysis of 8 clinical trials conducted at the University of Utah including 985 patients (mean age, 51.8 years) who underwent surgery and were receiving post-surgery prophylactic enoxaparin.</li>
 <li>Peak aFXa level in response to initial enoxaparin dosage was recorded in all patients, who were then followed up for 90 days.</li>
 <li>Following endpoints were evaluated: 
 <ul>
 <li>90-day symptomatic VTE (symptomatic deep vein thrombosis [DVT], pulmonary embolus, portal vein thrombosis, inferior vena cava thrombosis and central venous catheter-associated DVT);</li>
 <li>CRB (requiring treatment change, including enoxaparin discontinuation, unexpected transfusion, interventional/bedside procedure, return to operating room and unexpected visit to emergency room); and</li>
 <li>MB (defined by the International Society of Thrombosis and Hemostasis). 
 &nbsp;</li>
 </ul></li>
 <li>Funding: Plastic Surgery Foundation; others.</li>
</ul>

<h2>Key Results</h2>
<ul>
 <li>Included patients underwent reconstructive (n=507), thoracic (n=198), colorectal (n=116), orthopaedic (n=109) and trauma (n=55) surgeries.</li>
 <li>Among patients (n=376) receiving once-daily (OD) enoxaparin, 62.5%, 35.1% and 2.4% had low (&lt;0.3 IU/mL), in-range (0.3-0.5 IU/mL) and high (&gt;0.5 IU/mL) initial aFXa levels, respectively.</li>
 <li>Among patients (n=537) receiving twice-daily (BD) enoxaparin, 27%, 59% and 14% had low (&lt;0.2 IU/mL), in-range (0.2-0.4 IU/mL) and high (&gt;0.4 IU/mL) initial aFXa levels, respectively.</li>
 <li>Overall, 23 (2.3%) patients had 90-day VTE, with no differences observed in those receiving BD vs OD enoxaparin (2.6% vs 2.0%; P=0.67).</li>
 <li>Patients with initial low vs in-range/high aFXa levels had higher risk for VTE (4.2% vs 1.3%; logrank P=0.007). 
 <ul>
 <li>Initial low aFXa predicted VTE risk in patients receiving BD (6.2% vs 1.5%; logrank P=0.003) and not OD enoxaparin (3.0% vs 0.7%; logrank P=0.14). 
 &nbsp;</li>
 </ul></li>
 <li>41 (4.2%) and 21 (2.1%) patients had CRB and MB, respectively.</li>
 <li>Patients receiving BD vs OD enoxaparin were at higher risk for CRB (5.6% vs 2.2%; P=0.009) and MB (3.3% vs 0.5%; P=0.003).</li>
 <li>However, high aFXa vs low/in-range aFXa was not associated with 90-day CRB (4.8% vs 2.9%; logrank P=0.34) and MB (3.6% vs 1.6%; P=0.18).</li>
</ul>

<h2>Limitations</h2>
<ul>
 <li>Trials from only 1 institution were included.</li>
 <li>Low aFXa as a direct cause of VTE could not be proved.</li>
 <li>Day-to-day care may have been under-reflected.</li>
 <li>Real-time effects of enoxaparin dose adjustments on VTE were not assessed.</li>
 <li>Regression analysis was not performed.</li>
 <li>Possibility of high aFXa levels in patients who bled before enoxaparin reached a steady state was not investigated.</li>
</ul>

Reference

Low anti-Factor Xa indicative of inadequate enoxaparin dosing is associated with a higher incidence of post-surgical Venous Thromboembolism.

Risk for Post-operative Venous Thromboembolism in Patients Receiving Enoxaparin Prophylaxis

THROMBOSIS

CARDIOLOGY

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Risk for Post-operative Venous Thromboembolism in Patients Receiving Enoxaparin Prophylaxis