Management of Recurrent Urinary Tract Infection in the Elderly

Recurrent UTI is ≥2 culture-proven symptomatic episodes in 6 months or ≥3 in 12 months.

Distinguish relapse (same organism within 2 weeks — suggests an unresolved focus such as prostatitis, stone or abscess) from reinfection (different organism or later — suggests host susceptibility).

UTI is the commonest infection in the elderly and is especially frequent in debilitated and institutionalised individuals.

Obstructive uropathy is the strongest pathogenetic association — benign prostatic hyperplasia in men, and pelvic organ prolapse or cystocele in women.

Non-obstructive predisposing factors: vaginal and urethral atrophy from oestrogen deficiency, “puddling” of urine from bed rest and immobility, and bladder catheterisation.

Incomplete bladder emptying with a raised post-void residual, detrusor underactivity, constipation and faecal incontinence.

Diabetes, immunosenescence, functional dependence, cognitive impairment and previous antibiotic exposure with resistant flora.

In men, chronic bacterial prostatitis must be excluded — it classically presents as recurrent UTI with the same organism in the absence of catheterisation.

Confirm the diagnosis: symptomatic episodes with a positive urine culture on each occasion — do not diagnose recurrent UTI on urinalysis or on asymptomatic positive cultures.

Review all previous cultures and sensitivities to guide empirical therapy and to detect ESBL or carbapenem-resistant organisms.

Post-void residual by bladder ultrasound; ultrasound of the kidneys, ureters and bladder for stones, hydronephrosis and prostatic size.

Cystoscopy and upper-tract imaging if there is visible or persistent microscopic haematuria, suspected malignancy, obstruction, stone, or persistent infection with a urea-splitting organism.

Assess and treat the whole geriatric context: hydration, mobility, toileting access, constipation, incontinence, atrophic vaginitis, glycaemic control and nutrition.

Fluid intake: increase to at least 1.5 litres per day where intake is low — a simple measure with randomised evidence.

Topical vaginal oestrogen in postmenopausal women restores lactobacilli and vaginal pH and significantly reduces recurrence; oral oestrogen is not effective and is not recommended.

Behavioural and hygiene measures: complete bladder emptying, double voiding, post-coital voiding, avoiding spermicides, treating constipation, and timed toileting in the cognitively impaired.

Methenamine hippurate 1 g twice daily — converted to formaldehyde in acidic urine; a urinary antiseptic that does not select for resistance.

Cranberry products and D-mannose may be offered, with a clear explanation of modest and inconsistent evidence; probiotics have weak supporting data.

Remove or avoid catheters — this is often the single most effective intervention in the institutionalised patient.

Antibiotic prophylaxis is reserved for those failing non-antibiotic measures: continuous low-dose nightly (nitrofurantoin, co-trimoxazole, cefalexin), post-coital single dose, or patient-initiated self-start therapy in cognitively intact women.

Prophylaxis should be time-limited (typically 3–6 months) and reviewed, with awareness that benefit is lost once it stops. Nitrofurantoin should be avoided in eGFR <45 mL/min and with long-term use because of pulmonary and hepatic toxicity.

Do not treat asymptomatic bacteriuria, and do not perform test-of-cure cultures in asymptomatic patients — both drive resistance and Clostridioides difficile infection without benefit.