Gentamicin Bladder Instillation on CAUTI

Catheter Associated Urinary Tract Infection (CAUTI) is a hospital acquired infection considered preventable by the Center for Medicare & Medicaid Services (CMS) and originally estimated to cost each individual patient approximately $4700 per infection in 2009 US dollars1. In the inpatient population, more contemporary calculations have associated the per patient cost to have risen to a mean of $13,793 per patient (range $4,694-$29,743)2, with an increased median length of stay of 3.6 days, and a 1.37 increased odds ratio of death3.

CMS understandably has declared CAUTI a "never event", a term coined by the National Quality Forum and used to describe preventable hospital acquired infections4. Since 2008 they have tied this quality metric to severe hospital payment penalties to incentivize prioritization of strategies to decrease CAUTIs.

Despite considerable efforts to remain in compliance with this guidance, and hospitals nationwide implementing safer catheter placement training as well as aggressive early catheter removal protocols, it has become clear that CAUTIs are almost never a never event5. Quantitative analyses of these events have estimated that only 65-70% of CAUTIs are truly preventable with current evidence-based prevention strategies6.

In our intensive care units the pragmatic reasons explaining this phenomenon are abundantly clear. Trauma patients critically injured with multiple spinal, pelvic and long bone fractures, intubated on a ventilator and immobile have substantially higher rates of urine retention when foley catheters are removed aggressively within 72 hours of admission per current infection control protocols. Similarly, neuro critical care patients who incurred a massive stroke or traumatic brain injury who are immobilized from their disabilities do not routinely succeed with early catheter removal protocols. Replacing indwelling foley catheters after multiple failed intermittent urinary catheterizations incurs increased urethral trauma and pain for the patient, increased risk of procedural complications, and increased risk of CAUTI due to repeated urethral instrumentation.

On the basis of and in response to a clear need to develop novel strategies to eliminate CAUTIs in those patients for whom early catheter removal is not deemed clinically appropriate, we collected 8 months of pilot data at our level I trauma center ICU in which we prophylactically instilled an antibiotic containing irrigation solution into the indwelling foley catheters in patients who required catheterization for greater than 3 days. Over the observed pilot period zero CAUTI events were recorded as compared to a comparison control group of trauma patients with identical inclusion criteria for whom 9 "never event" CAUTIs were incurred. These differences were statistically significant.

The current proposal aims to expand this pilot data and conduct a full randomized trial to validate the efficacy of gentamicin antibiotic irrigation in critically ill patients with an indwelling foley catheter of greater than 3 days duration. We plan to expand our patient population to include critically ill patients admitted to the trauma, neuro-critical care and medical ICU units.

The current proposal aims to expand this pilot data and conduct a randomized trial to validate the efficacy of gentamicin antibiotic irrigation in critically ill patients with an indwelling foley catheter of greater than 3 days duration. We plan to expand our patient population to include critically ill patients admitted to the trauma, neuro-critical care and medical ICU units. Our primary research question is: Is prophylactic gentamicin bladder irrigation associated with decreased CAUTI in a cohort of catheterized trauma and neuro critical care patients.

Inclusion criteria

• age greater than 18
• admitted with a trauma, surgical, or neuro-critical care diagnosis
• indwelling foley catheter in place

Exclusion criteria

• Documented positive UA or Urine Culture within the past 7 days or upon admission
• Traumatic bladder injury
• Gross hematuria
• Chronic indwelling urethral or chronic suprapubic foley catheter
• allergy to gentamicin or similar aminoglycosides