Vancomycin Lock Therapy for Staphylococcus aureus–Positive Internal Jugular Catheters

Indications and Clinical Context

• Vancomycin lock therapy is an established option for catheter‑related bloodstream infections when preservation of the central venous catheter is desired, and it is used together with systemic antibiotics. 1, 2
• Vancomycin is the preferred lock agent for methicillin‑resistant Staphylococcus aureus (MRSA), whereas cefazolin (5 mg/mL) is preferred for methicillin‑susceptible S. aureus (MSSA). 1, 2, 3

Lock Solution Preparation

• The recommended vancomycin lock concentration is 5 mg/mL. 1, 2, 3
• Higher concentrations (5 mg/mL) are more effective than lower concentrations (1 mg/mL) for eradicating staphylococci embedded in catheter biofilm. 1, 2
• The lock solution may be prepared with or without heparin at 0, 2 500, or 5 000 IU/mL. 1, 2, 3

Typical preparation (5 mg/mL vancomycin with 2 500 IU/mL heparin):

Administration Technique

• Prior to locking, withdraw any blood or fluid from the catheter lumen. 3
• Fill the entire catheter lumen with the lock solution; the volume should match the catheter’s internal volume (approximately 0.1–0.3 mL for central lines). 1, 2
• Maintain the lock solution dwelling continuously for 72 hours before draining and replacing the lock. 1

Concurrent Systemic Therapy

• Systemic vancomycin (or another appropriate anti‑staphylococcal antibiotic) must be administered concurrently with the lock solution. 4
• For empiric therapy while awaiting culture results, vancomycin is appropriate when MRSA is suspected. 4

Alternative Lock Solutions

• For MSSA infections, a cefazolin lock at 5 mg/mL is preferred over vancomycin. 1, 2, 3
• A 70 % ethanol lock may be considered for mixed gram‑positive and gram‑negative catheter infections. 1, 2, 3

Catheter Removal Considerations

• Catheter removal should be strongly considered in patients with severe sepsis or hemodynamic instability, metastatic complications (e.g., endocarditis, osteomyelitis, abscess), or when the catheter is no longer required for clinical care. 4