A 68-year-old male with a history of Alzheimer’s dementia and incontinence presents with failure to thrive
by Kristin Furfari, MD, and Heidi Wald, MD, MSPH
A 68-year-old male with a history of Alzheimer’s dementia and incontinence presents with failure to thrive. A Foley catheter is placed due to the patient’s incontinence and fall risk. Three days after admission while awaiting placement in a skilled nursing facility (SNF), he develops a urinary tract infection (UTI) complicated by delirium delaying his transfer to the SNF. What could have been done to prevent this complication?
It has been 50 years since Beeson, et al., recognized the potential harms stemming from urethral catheterization and penned an editorial to the American Journal of Medicine titled “The case against the catheter.”1
Since then, there has been considerable exploration of ways to limit urethral catheterization and ultimately decrease catheter-associated urinary tract infections (CAUTIs). Unfortunately, little progress has been made; indwelling urinary catheters remain ubiquitous in hospitals and CAUTIs remain the most common hospital-acquired infection in the United States.2 Given the emphasis on the quality and costs of healthcare, it is an opportune time to revisit catheter management and use as a way to combat the clinical and economic consequences of CAUTIs.
Clinicians may be lulled into thinking the clinical impact of CAUTI is less than that of other nosocomial infections. However, beyond the obvious patient harm from UTIs, associated bacteremia, and even death, the public health implications of CAUTI cannot be denied. Urinary tract infections constitute 40% of all nosocomial infections; accounting for an estimated 1 million cases annually.3 Further, 80% of all UTIs are associated with indwelling catheter use.
On average, nosocomial UTI necessitates one extra hospital day per patient, or approximately one million excess hospital days per year.4 Pooled cost analysis shows that UTIs consume an additional $400-$1,700 per event, or an estimated $425 million per year in the United States.5,6 Clearly, we cannot wait another 50 years to address this problem.
Catheter duration as a risk factor for CAUTI: The indwelling catheter creates a portal of entry into a usually sterile body cavity and provides a surface on which microorganisms can colonize. At a finite rate of colonization—the incidence of bacteriuria is 3% to 10% per catheter day—the duration of urinary catheterization becomes the strongest predictor of catheter-associated bacteriuria.7 Even in relatively short-term catheter use of two to 10 days, the pooled cumulative incidence of developing bacteriuria is 26%.
Given the magnitude of these numbers, it should be no surprise that after one month of catheterization, bacteriuria develops in almost all patients. Twenty-four percent of patients with bacteriuria develop symptomatic UTIs with close to 5% suffering bacteremia. Consequently, nosocomial UTIs cause 15% of all hospital-acquired bacteremia.
Optimal catheter management: The easiest and most effective means to prevent CAUTI is to limit the use of urinary catheters to clearly identified medical indications (see Table 1, above). However, as simple as this prevention practice may sound, studies have demonstrated that as many as 20% of patients have indwelling catheters initially placed for unjustified or even unknown medical indications.8 Additionally, continued catheter use is inappropriate in one-third to one-half of all catheter days.9 These data confirm misuse and overuse of indwelling urinary catheters in the hospital setting is common.
In 1981, the Centers for Disease Control and Prevention (CDC) recognized the importance of addressing this situation and published a guideline to aid prevention of CAUTIs.10 The CDC urged the limitation of catheter use to a carefully selected patient population. Furthermore, the report strongly stressed the importance of catheter removal as soon as possible and advised against the use of catheters solely for the convenience of healthcare workers.
Evidence-based techniques for insertion and catheter care also were outlined in the guideline (see Table 2, p. 31). However, these recommendations have been poorly implemented, likely due to the competing priorities of providers and the difficulty operationalizing the guidelines. Additionally, evidence from the intervening 25 years has not yet been incorporated into the guideline, although a revision currently is underway.
Until that revision is complete, the Joanna Briggs Institute guideline published in 2001 addresses some of the same management techniques and incorporates newer evidence.11 Of note, practices that have been discredited due to contradictory evidence include aggressive meatal cleaning, bladder irrigation, and the application of antimicrobial agents in the drainage bag.12
Strategies to reduce unnecessary catheter days: One of the remediable reasons for catheter misuse lies in the fact physicians often are unaware of the presence of an indwelling catheter in their hospitalized patients.
Saint, et al., showed physicians were unaware of catheterization in 28% of their patients and that attending physicians were less conscious of a patient’s catheter status than residents, interns, or medical students.13 Further, the “forgotten” catheters were more likely to be unnecessary than those remembered by the healthcare team.
This information has prompted the use of various computer-based and multidisciplinary feedback protocols to readdress and re-evaluate the need for continued catheterization in a patient. For example, a study at the VAMC Puget Sound demonstrated that having a computerized order protocol for urinary catheters significantly increased the rate of documentation as well as decreased the duration of catheterization by an average of three days.14
Similar interventions to encourage early catheter removal have included daily reminders from nursing staff, allowing a nurse to discontinue catheter use independent of a physician’s order, and feedback in which nursing staff is educated about the incidence of UTI.15-17 All these relatively simple interventions showed significant improvement in the catheter removal rate and incidence of CAUTIs as well as documented cost savings.
Alternatives to indwelling catheters: In addition to efforts to decrease catheter days, alternatives to the indwelling catheters also should be explored. One such alternative method is intermittent catheterization.
Several studies in postoperative patients with hip fractures have demonstrated that the development of UTI is lower with intermittent catheterization when compared with indwelling catheterization.18 Nevertheless, since the risk of bacteriuria is 1% to 3% per episode of catheterization, after a few weeks the majority of patients will have bacteriuria. However, as the bulk of this bacteriuria often is asymptomatic, intermittent catheterization may still be an improvement. This is particularly true in postoperative patients undergoing rehabilitation and those patients only requiring catheterization for a limited number of days.
More recent studies have evaluated the use of bedside bladder ultrasound in an attempt to determine when intermittent catheterization is needed and thereby limit its use compared with standard timed catheterization. Frederickson, et al., demonstrated that this intervention resulted in significantly fewer catheterizations in surgical patients, thus delaying or avoiding the need for catheterization in 81% of the cases.19 Given this drastic improvement, it is no surprise bladder ultrasound use reduced the rates of UTI.20
External condom catheters present another alternative to indwelling catheter use but the outcomes data is conflicting. While the risk of bacteriuria is approximately 12% per month, this rate becomes increasingly higher with frequent manipulation of the condom catheter. 21,22
Two parallel cohort studies in a VA nursing home showed the incidence of symptomatic UTI to be 2.5 times greater in men with an indwelling catheter than those with a condom catheter.23 On the other hand, a cross-sectional Danish study reported higher rates of UTI with external condom catheters than urethral catheters in hospitalized patients.24 Complications from condom catheters include phimosis and local skin maceration, necessitating meticulous care with the use of these devices. Although the data surrounding external catheterization is somewhat contradictory, this device warrants consideration in incontinent males without urinary tract obstruction.
There are several other alternatives to urethral catheterization (see Table 3, p. 31), many of which have excellent face validity even in the absence of rigorous evidence.
Antimicrobial catheters: The development of antimicrobial urinary catheters, including silver-alloy and nitrofurazone-coated catheters, has been greeted with much excitement, however, the jury is still out about their best use. A 2006 systematic literature review reported that in comparison to standard catheters, antimicrobial catheters can delay or even prevent the development of bacteriuria with short-term usage.25
However, not all antimicrobial catheters are equally effective; assorted studies lack data about clinically relevant endpoints such as prevention of symptomatic UTI, bloodstream infection or death.26, 27 In addition, there are no good trials comparing nitrofurazone to silver-alloy catheters. Therefore, the level of excitement surrounding antimicrobial catheters—particularly silver-alloy catheters—must be tempered by the additional costs incurred by their use.
To date, the cost-effectiveness of antimicrobial catheters has not been demonstrated. Although additional research in this topic is still needed, some experts currently recommend the consideration of silver-alloy catheters in patients at the highest risk for developing serious consequences from UTIs.
Efforts to reduce CAUTI: In response to significant public interest in hospital-acquired infections including CAUTI, the federal government and many state governments are beginning to demand change. In August 2007, the Centers for Medicare and Medicaid Services instituted a mandate making hospitals financially responsible for selected preventable hospital-acquired harms, including CAUTIs.28 In addition, beginning with Pennsylvania in 2006, several states have mandated public reporting of hospital-acquired infections.29
Given the available information about CAUTI prevalence, risks, and preventive techniques, it is surprising the majority of hospitals in the United States have not taken appropriate measures to limit indwelling catheter use. A recent study by Saint, et al., demonstrated the startling fact that only a minority of hospitals monitor the use of urethral catheters in their patients.30
Among study hospitals, there was no widely used technique to prevent CAUTI including evidence-based practices such as daily catheter reminders. The results of this investigation illustrate the urgent need for a national strategy to reduce CAUTI. Until that time, however, hospital-based physicians must take the lead to champion collaborative efforts, to promote evidence-based catheter use.
As incontinence and fall risk are not medically appropriate indications for a urethral catheter, a Foley catheter should not have been utilized. Alternatives to indwelling catheterization in this patient would include a bedside commode with nursing assistance, a timed voiding program, intermittent catheterization with or without bladder ultrasound, incontinence pads, or a condom catheter.
Attentiveness to the appropriate medical indications for catheter use, familiarity with catheter alternatives, and recognition of the clinical and economic impact of CAUTI may have prevented this patient’s UTI-induced delirium and facilitated his early transfer to SNF. TH
Dr. Wald is a getriatric hospitalist and assistant professor of medicine at the University of Colorado, Denver. Dr. Furfari is a hospital medicine fellow at the University of Colorado Denver.
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