Catheter-Related Bloodstream Infection on Home PN

The most likely diagnosis is catheter-related bloodstream infection (CRBSI). The patient has fever and rigors temporally related to infusion, positive cultures from both the catheter and a peripheral vein with the same organism, no alternative source, and a clean exit site without tunnel infection. Staphylococcus epidermidis is a common skin commensal and a frequent cause of CRBSI, especially in patients with long-term central access.

The differential time to positivity is about two hours, with the catheter culture turning positive earlier than the peripheral culture. A differential time of greater than two hours is widely used as a criterion supporting catheter-related infection, because a much higher organism burden in the catheter lumen leads to earlier growth. A two-hour difference is at the threshold and should be interpreted with the clinical picture rather than alone. The hypotension and rigors indicate a systemic response and make this a complicated or potentially complicated episode, not an uncomplicated exit-site infection.

Catheter removal is generally recommended for CRBSI complicated by severe sepsis, hemodynamic instability, persistent bacteremia, suppurative thrombophlebitis, endocarditis, or infection with Staphylococcus aureus, Pseudomonas, or Candida. This patient is hypotensive and has rigors, so removal should be strongly considered, especially if hypotension persists after fluid resuscitation or if blood cultures remain positive. However, coagulase-negative staphylococci such as S. epidermidis are sometimes managed with catheter salvage in stable, uncomplicated patients because the organism is less virulent.

The decision should be individualized with infectious diseases. If the catheter is removed, systemic vancomycin should continue based on susceptibility, typically for 7-14 days depending on the clinical course and whether there is persistent bacteremia. If salvage is attempted, systemic antibiotics plus an antibiotic lock solution are used for approximately 10-14 days, with repeat blood cultures at 48-72 hours. Given the hypotension, I would lean toward removal rather than salvage, and I would not resume home PN through the same catheter until the patient is clinically stable and cultures have cleared.

I would recommend a catheter care bundle with observed hand hygiene, hub disinfection with an appropriate antiseptic and friction time, sterile dressing changes, and a dedicated PN lumen when possible. Staff and patient education should include avoiding unnecessary line breaks, minimizing manipulation, and recognizing early signs of infection. The program should audit compliance with hub scrubbing, dressing technique, and hand hygiene, and track CRBSI rates per 1,000 catheter-days.

Additional measures include standardized PN compounding and administration procedures, clear written instructions for patients and caregivers, and a process for prompt reporting of fever or rigors during infusion. Some programs use ethanol or antibiotic lock prophylaxis in selected high-risk patients, but this should be guided by local policy and infectious diseases because of resistance and safety concerns. A root-cause review of this episode should ask whether the line was accessed under sterile conditions, whether the PN was infused through a dedicated lumen, and whether the patient had received adequate training. The findings should feed back into education and bundle revisions.