Urinary Tract Infections in Elderly Patients

Diagnosis and Treatment

In elderly males with >100,000 CFU of coagulase-negative staphylococcus in urine culture but without urinary symptoms, antimicrobial treatment is strongly recommended against as this represents asymptomatic bacteriuria (ASB), not a urinary tract infection requiring treatment, as recommended by the Infectious Diseases Society of America 1
The Infectious Diseases Society of America strongly recommends against treating ASB in elderly patients, with high certainty for harm from antibiotics and low certainty of any benefit from treatment 1

There is high certainty for harm from antibiotics and low certainty of any benefit from treatment in elderly patients with ASB, including an increased risk of antibiotic-associated diarrhea, promotion of antimicrobial resistance, and adverse drug reactions 1

Antibiotic treatment is associated with an increased risk of antibiotic-associated diarrhea, including C. difficile infection, promotion of antimicrobial resistance, and adverse drug reactions 1

There is no evidence that treating ASB improves mental status, falls, or other outcomes, or reduces the risk of sepsis, death, or hospitalizations in elderly patients 1

Current evidence does not suggest a causal relationship between bacteriuria and changes in mental status or falls in the elderly, and non-specific symptoms like altered mental status or falls should not be attributed to bacteriuria without other UTI symptoms, as recommended by the European Urology guidelines 1
Elderly patients with dementia and suspected infection require careful consideration of antibiotic treatment due to age-related physiological changes, immunosenescence, and reduced physiological reserve, as recommended by the American Urological Association and the European Urology guidelines 2, 3, 4

The American Urological Association recommends amoxicillin-clavulanate 875 mg orally twice daily as the empiric antibiotic choice for elderly patients with dementia who have lethargy and suspected infection, due to its broad coverage of both skin/soft tissue and urinary tract pathogens 5
Levofloxacin 500 mg PO daily has excellent coverage for UTI pathogens and good coverage for most wound pathogens, but caution is advised due to the risk of tendinopathy and CNS effects in elderly patients, as recommended by the American Urological Association 5

Recommended antibiotics for UTIs include:

Antibiotic	Dose
Cefpodoxime	200 mg twice daily for 10 days (normal renal function)
Cefpodoxime	200 mg once daily (mild renal impairment), 200 mg every 24-48 hours (severe renal impairment)
Ciprofloxacin	500 mg every 12 hours (normal renal function), 250-500 mg every 12 hours (creatinine clearance 30-50 mL/min)

6, 7, 3

Assess for changes in urine color, odor, cloudiness, or hematuria in elderly individuals with suspected UTI, and check for dysuria, frequency, urgency, incontinence, or costovertebral angle tenderness, although these symptoms may be absent, as recommended by the European Urology guidelines 3
Recognize sepsis indicators, including fever, rigors/shaking chills, delirium or altered mental status, tachycardia, hypotension, cool extremities, and decreased urine output, as recommended by the European Urology guidelines 4, 3

Obtain urine and blood cultures before starting antibiotics, and request urinalysis with microscopic examination for WBCs, and order a Gram stain of uncentrifuged urine, as recommended by the Infectious Diseases Society of America 8

Initiate immediate aggressive fluid resuscitation with crystalloids (30 ml/kg within 3 hours) and administer broad-spectrum antibiotics within 1 hour of recognizing sepsis in elderly patients with dementia and UTI, as recommended by the American College of Critical Care 9
Apply oxygen to achieve saturation >90%, as recommended by the Intensive Care Medicine guidelines 4
Aim for a urine output of approximately 1 L/24 hours unless contraindicated, and regulate fluid intake with careful monitoring to avoid both dehydration and fluid overload, as recommended by the National Kidney Foundation 10

Maintain adequate hydration (unless contraindicated), void after intercourse, avoid prolonged holding of urine, and avoid disruption of normal vaginal flora with harsh cleansers to reduce UTI risk, as recommended by 11, 3
Ensure adequate nutrition and avoid desnutrition to negatively affect renal function and complicate UTI treatment, as noted by 12, 3
Consider vaginal estrogen replacement in postmenopausal women, methenamine hippurate, immunoactive prophylaxis, and continuous or postcoital antimicrobial prophylaxis for prevention, as recommended by the European Urology guidelines 6

Referral to a urologist is warranted for patients with symptoms or test results such as DRE suspicious of prostate cancer, hematuria, abnormal PSA, pain, recurrent infection, palpable bladder, neurological disease, or significant weight loss, according to the American Urological Association 13
Patients should be reassessed in 48-72 hours to evaluate clinical response, and if symptoms persist or worsen, obtain urine culture and consider alternative antibiotics, as recommended by the European Urology guidelines 6
Discontinue or minimize nephrotoxic drugs, adjust dosages of renally excreted medications, and avoid coadministration of known nephrotoxic drugs in managing impaired renal function in elderly patients, with a strength of evidence classified as moderate, as recommended by the American Heart Association 12, 14