Asymptomatic bacteriuria in older adults: the most fragile women are prone to long-term colonization

Autor: Michael Biggel, Stefan Heytens, Katrien Latour, Robin Bruyndonckx, Herman Goossens, Pieter Moons
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: BMC Geriatrics, Vol 19, Iss 1, Pp 1-11 (2019)
Druh dokumentu: article
ISSN: 1471-2318
DOI: 10.1186/s12877-019-1181-4
Popis: Abstract Background The diagnosis of urinary tract infections (UTIs) in institutionalized older adults is often based on vague symptoms and a positive culture. The high prevalence of asymptomatic bacteriuria (ABU), which cannot be easily discriminated from an acute infection in this population, is frequently neglected, leading to a vast over-prescription of antibiotics. This study aimed to identify subpopulations predisposed to transient or long-term ABU. Methods Residents in a long-term care facility were screened for ABU. Mid-stream urine samples were collected during two sampling rounds, separated by 10 weeks, each consisting of an initial and a confirmative follow-up sample. Results ABU occurred in approximately 40% of the participants and was mostly caused by Escherichia coli. Long-term ABU (> 3 months) was found in 30% of the subjects. The frailest women with urinary incontinence and dementia had drastically increased rates of ABU and especially long-term ABU. ABU was best predicted by a scale describing the functional independence of older adults. Conclusions Institutionalized women with incontinence have ABU prevalence rates of about 80% and are often persistent carriers. Such prevalence rates should be considered in clinical decision making as they devalue the meaning of a positive urine culture as a criterion to diagnose UTIs. Diagnostic strategies are urgently needed to avoid antibiotic overuse and to identify patients at risk to develop upper UTI.
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