Peter P. Patterson MD, Covenant Health Network, Phoenix, AZ and Emily Schmitz PharmD, SRx Consultant Group, LLC, Chandler, AZ
This edition of Elder Care addresses diagnosis and treatment of urinary tract infections (UTI) in non-catheterized patients in long-term care facilities. UTIs are said to be the most common infections in residents of long-term care facilities as well as in home-bound and ambulatory older adults. It is also the most frequent indication for starting antibiotics in older adults. There is growing realization, however, that many older adults treated for a UTI do not actually meet the standard case definition for having a UTI (Table 1).
|Table 1. Case Definition of UTI in Non-Catheterized patients
Microbiologic and clinical criteria must both be met
Up to 50% of older adults residing in long-term care facilities will have a positive urine culture without meeting the clinical criteria for UTI. These individuals have asymptomatic bacteriuria and do not require antibiotic therapy. Yet, nearly 70% of long-term care facility residents receive at least one course of antibiotics every year, and many receive multiple courses, often to treat what has been diagnosed as a "recurrent" or "chronic" UTI, but which is often simply asymptomatic bacteriuria.
Sometimes patients have non-specific symptoms such as confusion or lethargy, a urine dipstick positive for leukocyte esterase and/or nitrites, and a urine culture with a colony count of 25,000 to >100,000 with an identified organism and antibiotic susceptibilities. While the patient may have those symptoms, this clinical picture is a "non-UTI" as the patient does not meet the criteria in Table 1. Nonetheless, this non-UTI scenario often masquerades as a UTI and leads clinicians to prescribe antibiotics. Some other common masquerade scenarios and the appropriate responses to those scenarios are shown in Table 2. The risks of inappropriate antibiotic use in these scenarios include the emergence of multi-drug resistant organisms, an increased risk of Clostridium difficile infection, and adverse effects from antibiotic medications.
|Table 2. Common Scenarios in Which Asymptomatic Bacteriuria Is Misinterpreted as UTI in Non-Catheterized Patients|
Best practice standards say that when there is uncertainty about a UTI in an older adult who lives in a long-term care facility, the correct approach to managing the uncertainty is withholding empiric antibiotic treatment, not ordering urine studies initially, increasing fluid intake, and actively observing the patient for 24-48 hours. At the end of the observation period, symptoms have often resolved and unnecessary antibiotics will have been avoided.
If the clinical picture has not resolved, or if the patient's condition deteriorates at any time during observation, urine studies can then be obtained. If results of the urine studies are positive and the patient also has clinical findings that meet the definition of UTI (Table 1), antibiotic treatment can be initiated.
Practical implementation of this approach in a long-term care facility depends on updating the facility's policies and an education campaign aimed at all members of the care team who have direct patient contact. Educating facility residents and their families is equally important, and can be accomplished through the facility's admission orientation packet and presentations at resident meetings and family nights.
Analogous care in outpatient clinics and office practices should emphasize the same basic approach of withholding antibiotics unless the patient meets criteria for UTI, along with encouraging fluid intake, non-pharmacologic alternatives, (e.g., cranberry juice) and urinary analgesics (e.g., phenazopyridine) for low-grade dysuria symptoms.
When a UTI has been diagnosed and treatment is indicated, fluoroquinolones are no longer the drugs of first choice for uncomplicated UTI in non-hospital settings. Current guidelines from professional societies emphasize either nitrofurantoin or trimethoprim-sulfamethoxazole as a first-line drug. Duration of therapy for uncomplicated UTI (cystitis) is now recommended to be 3-5 days. Repeat urine culture as a test of cure is not necessary or recommended.
The approach outlined in this edition of Elder Care is a change from long-standing practice standards. Much of the existing literature discussing UTI in older adults is based on outmoded concepts and clinical definitions that have not been updated as our understanding of the human urinary tract microbiome has evolved.
For example, it was formerly believed that a normal urinary bladder should be free of bacteria and that a colony count of as little as 100 colony-forming unit/ml in a catheterized specimen represented significant bacteriuria calling for treatment. We now know that older adults can be asymptomatically colonized with one or more organisms in the bladder at colony counts up to or exceeding 100,000. In the past, a finding of two or more organisms in the urine at or near these levels might have been considered a UTI, but now is considered prima facie evidence of asymptomatic colonization because poly-microbial UTIs do not occur. In addition, note that current National Healthcare Safety Network criteria for diagnosing UTI no longer make a distinction between clean-voided and catheter-drawn specimens.
The predominant force generating widespread antimicrobial resistance to antibiotics is antibiotic overuse. Unnecessary antibiotic treatment of the various asymptomatic bacteriuria scenarios that are misinterpreted UTI (Table 2) provides no clinical benefit and only contributes to increased multi-drug resistance. Avoiding over-diagnosis and over-treatment of UTI is an important step in the campaign to preserve the effectiveness of antibiotics - a mainstay of modern healthcare.
References and Resources
- Falagas ME, Kotsantis IK et al. Antibiotics versus Placebo in the Treatment of Women with Uncomplicated Cystitis: A Meta-analysis of Randomized Controlled Trials. J Infect 2009; 58: 91-102.
- Finucane TE. 'Urinary Tract Infection' - Requiem for a Heavyweight. J Am Geri Soc 2017; 65(8): 1650-1655.
- Nance, et al. Clinical Uncertainties in the Approach to Long Term Care Residents with Possible Urinary Tract Infection. JAMDA 2014; 15: 133-139.
- Patterson PP. Guest editorial. Steering a Transition in Antibiotic Prescribing: Just-in-Time not Just-in-Case. Caring for the Ages 2017; 18(8): p. 8.
- Ryan S, Gillespie E and Stuart RL. Urinary Tract Infection Surveillance in Residential Aged Care. Am J Infection Control 2018; 46(1):67-72.
- Stone ND. Surveillance Definitions of Infections in Long-Term Care Facilities: Revisiting the McGeer Criteria. Infect Control Hosp Epidemiol 2012; 33(10): 965-977.