Treatment of Tunneled Catheter Infection

Initial Assessment and Management

The Infectious Diseases Society of America recommends removing the catheter immediately and administering 7-10 days of systemic antibiotics for tunnel infections without bacteremia; if bacteremia is present, extend treatment to 10-14 days for uncomplicated cases or 4-6 weeks for complicated infections 1
Obtain blood cultures from both the catheter and a peripheral vein before initiating antibiotics to confirm catheter-related bloodstream infection (CRBSI) 1, 2
Assess for complications including septic thrombosis, endocarditis, metastatic infections, port abscess, or tunnel infection through clinical examination and appropriate imaging 1, 3
Perform transesophageal echocardiography (TEE) if Staphylococcus aureus bacteremia is documented to rule out endocarditis 3, 4

Remove the catheter immediately in all cases of tunnel infection or port abscess 1, 5
For Coagulase-Negative Staphylococci, attempt catheter salvage with systemic antibiotics plus antibiotic lock therapy for 14 days 3, 2
For Staphylococcus aureus, remove the catheter due to high risk of metastatic infection and treat with 10-14 days of systemic antibiotics if TEE is negative and infection is uncomplicated 3, 6
For Fungal Infections (Candida species), remove the catheter immediately and administer antifungal therapy for 14 days after the last positive blood culture and resolution of symptoms 7, 6, 5

Prepare antibiotic lock solution with concentrations 100-1000 times higher than the minimum inhibitory concentration (MIC) 3, 2
Instill into catheter lumen after each dialysis session and allow to dwell until the next session 2
Continue for 14 days in conjunction with systemic antibiotics 3, 2

Add antipseudomonal coverage (ceftazidime, cefepime, piperacillin-tazobactam, or carbapenem) for neutropenic patients, severe sepsis, or gram-negative infection 7, 6
Adjust therapy based on culture and susceptibility results once available 2

Wait until blood cultures are negative and appropriate systemic antimicrobial therapy has been initiated 4
For endocarditis or complicated infections requiring 4-6 weeks of antibiotics, complete the full course plus an additional 5-10 days, then obtain repeat surveillance blood cultures before placing a new catheter 4

Do not attempt catheter salvage for tunnel infections, port abscesses, fungal infections, S. aureus bacteremia, or hemodynamically unstable patients 1, 5
Do not treat endocarditis for less than 4-6 weeks, as this increases relapse risk 4
Monitor for persistent bacteremia (≥3 days after catheter removal despite appropriate antibiotics), which requires aggressive evaluation for septic thrombosis or metastatic infection 4
Recognize that Enterobacter species can develop resistance during therapy, particularly to third-generation cephalosporins 2