Management of Elevated WBC After Femoral Bypass Without Fever

Understanding Post-Surgical Leukocytosis

The American College of Cardiology and other societies suggest that an elevated WBC count after femoral bypass surgery without fever is a common physiologic response to surgery and does not automatically warrant aggressive infection workup in the absence of other clinical signs of infection, evaluate for infection only if WBC >14,000 cells/mm³ OR left shift present 1, 2, 3, 4

Evaluate for infection only if WBC >14,000 cells/mm³ OR left shift present, with a likelihood ratio of 3.7 for bacterial infection 4
Look for wound examination: Erythema, warmth, purulent drainage, or wound dehiscence at the surgical site 2
Assess for systemic signs: Hypotension, tachycardia, altered mental status, or rigors 1, 2
Check for graft-specific complications: New onset of limb pain, coolness, or loss of pulses suggesting graft thrombosis with secondary infection 5
Evaluate respiratory symptoms: Tachypnea, hypoxemia, or productive cough suggesting pneumonia 1, 2

If clinical signs of infection are present, obtain blood cultures before initiating antibiotics 1, 2
Culture any wound drainage if present 1
Consider imaging if deep infection or fluid collection is suspected around the graft 4
Initiate broad-spectrum antibiotics covering skin flora while awaiting culture results 1, 2

Do not ignore a left shift, even with WBC <14,000, a significant left shift warrants infection assessment 1, 2, 3
Avoid invasive procedures through potentially infected tissue until infection is excluded 4

Bilateral procedures and higher comorbidity burden are factors associated with higher postoperative WBC counts 5