A nurse is assessing an older adult client who has a urinary tract infection (UTI). Which of the following findings should the nurse identify as unique for this age group?

Choice A rationale While low back pain (flank pain) can be a non-specific symptom, its presence often suggests pyelonephritis (kidney infection) due to inflammation of the renal capsule. This symptom is not unique to older adults but rather indicates upper urinary tract involvement in people of any age, although older adults might report it less overtly or with reduced severity. Choice B rationale Incontinence (new onset or worsening) is a common symptom of a UTI in all adults due to bladder wall irritation (cystitis) and detrusor muscle spasms. However, it's a less specific finding than confusion in the older adult, as incontinence has numerous other causes in this demographic (e.g., mobility issues, polypharmacy). Choice C rationale Confusion or acute delirium is a unique and often the sole or primary presenting symptom of a urinary tract infection in older adults. This phenomenon is due to the altered immune response, decreased physiological reserve, and impaired blood-brain barrier common in the elderly, leading to systemic inflammatory mediators crossing the barrier and disrupting cognitive function. Choice D rationale Urinary retention (inability to completely empty the bladder) is a common finding in older men due to Benign Prostatic Hyperplasia (BPH) and is a risk factor for UTIs. However, retention is a cause/risk factor or a general urinary symptom, not the unique hallmark presentation of an active UTI in the elderly population.