Management of Infectious Phlebitis

Evaluation and Diagnosis

The Infectious Diseases Society of America recommends suspecting suppurative thrombophlebitis when bacteremia or fungemia persists after 3 days of adequate antimicrobial therapy without another identifiable source of intravascular infection 1, 2, 3
Diagnosis requires positive blood cultures plus demonstration of a thrombus through radiographic studies (computed tomography, ultrasonography, or other methods) 1
Obtain catheter and peripheral blood cultures, as well as culture of the insertion site exudate with Gram stain 4, 5
Look for clinical signs: pain (83% of cases), erythema and edema (63%), palpable and tender venous cord, especially in upper limbs 2

The Infectious Diseases Society of America recommends immediate catheter removal in all cases of infectious phlebitis 1, 5, 3, 6
For peripheral catheters with pain, induration, erythema, or exudate: mandatory removal 5
For short-term central venous catheters with Candida infection: mandatory removal and sending the catheter tip for culture 1
For hemodialysis catheters with S. aureus infection: immediate removal if there is persistent bacteremia >72 hours, severe sepsis, or metastatic infection 7
Place a new catheter at a different site if continuous venous access is required 4, 5

The Infectious Diseases Society of America recommends starting vancomycin plus coverage for gram-negative bacilli based on local antibiogram (third-generation cephalosporin, carbapenem, or beta-lactam/beta-lactamase inhibitor) 7, 4
Staphylococci and S. aureus are the most common pathogens (80% gram-positive organisms) 5
Most of these pathogens exhibit methicillin resistance, justifying empirical vancomycin 5
Consider that vancomycin has lower clinical success if the minimum inhibitory concentration (MIC) is ≥2 μg/mL 5

The Infectious Diseases Society of America recommends a minimum of 3-4 weeks of antimicrobial therapy for confirmed suppurative thrombophlebitis 1, 2, 3
Uncomplicated bacteremia with catheter removal: 7-14 days 1
Persistent bacteremia >72 hours after catheter removal: 4-6 weeks 7
Endocarditis or metastatic infection: 4-6 weeks 7
Osteomyelitis: 6-8 weeks 7

The Infectious Diseases Society of America recommends limiting surgical resection of the involved vein to patients with superficial purulent veins, infection extending beyond the vessel wall, or failure of conservative therapy with appropriate antimicrobial regimen 1, 3
Surgery has a success rate of 80-90% in selected cases 3

Perform transesophageal echocardiography (TEE) for patients with persistent bacteremia/fungemia >3 days after starting appropriate therapy and catheter removal 1
Look for infective endocarditis, especially in cases of S. aureus 1
Evaluate for septic pulmonary emboli and metastatic infections (10-20% incidence) 3
Approximately 10% of patients with symptomatic superficial venous thrombosis develop thromboembolic complications (DVT, PE) at 3 months 2

Obtain surveillance blood cultures 1 week after completing the course of antibiotics if the catheter was retained 7
Evaluate the site daily for progression of sensitivity, erythema, heat, and swelling 6
Monitor for signs of systemic infection: fever, purulent drainage, systemic symptoms 6

Do not apply topical antimicrobial ointments or creams to the phlebitis site, as they provide no benefit 6
Do not leave the catheter in situ waiting for the phlebitis to resolve on its own with treatment 6
Do not use intravenous thrombolytic agents (such as urokinase) as adjunctive treatment for catheter-related infection 5
Do not use lower limb sites for subsequent intravenous therapy; use only upper limb sites 6