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LONGITUDINAL STUDY ASSESSING THE EFFECTS OF METHENAMINE HIPPURATE ON THE URINARY MICROBIOME OF POSTMENOPAUSALWOMEN WITH RECURRENT UTI
Female Pelvic Medicine and Reconstructive Surgery ; 28(6):S33-S34, 2022.
Article in English | EMBASE | ID: covidwho-2008694
ABSTRACT

Introduction:

Postmenopausal women with recurrent urinary tract infections (RUTI) are repeatedly exposed to antibiotics and therefore at risk for colonization by multi-drug resistant organisms. Methenamine hippurate (MH) is FDAapproved for the prevention of RUTI;however, the mechanism of action of MH or, more specifically, the role of MH in the alteration of the urobiome is not known. Since preliminary data has shown that MH may be effective against some bacteria (e.g., Escherichia coli), but not others (e.g., Enterococcus faecalis), we hypothesize that resident bladder microbiota will be altered by administration of MH.

Objective:

Our objective is to determine the longitudinal effect of MH on the urobiome of postmenopausal women with RUTI.

Methods:

A longitudinal study with a convenient sample of 10 postmenopausal women with a clinical history of RUTI was conducted (Figure 1). UDI6 questionnaires, voided urine, catheterized urine, and peri-urethral swabs were obtained at baseline and three months after daily MH use. Expanded quantitative urine culture (EQUC) was performed on these specimens. In addition, during the 3-month timeframe, four self-collection windows were completed (windows A-D) (A) prior to initiating MH (baseline urobiome), (B) one week after starting MH, (C) two weeks before the 3-month follow-up, and (D) one week before the 3-month follow-up. Voided urine and peri-urethral swabs were collected daily for one week during windows A-D to determine how the urobiome changed. Sequencing of samples from these collection windows is pending.

Results:

Ten participants enrolled;however, three participants were not able to complete the study due to allergic reaction, improper handling of samples, and COVID infection. Six participants have completed the study;microbiological studies for one participant are still in process. There were no episodes of acute cystitis for any participant during the length of the study. UDI6 results suggested a trend towards a decrease in frequency, leakage with urgency, and abdominal pain;however, none of these were statistically significant (Table 1). Of the six remaining participants, the average baseline urine pH was 5.8 ± 0.8. For the completed participants, an initial microbiological comparison of EQUC results at baseline and 3-month visits show differences in sample diversity. Specifically, the number of species detected (richness) in catheterized urine increased for all but one participant (Figures 2A and 2B) though there was little or no changes in overall diversity (Shannon Index, Figure 2B) or evenness (Pielou's Index, Figure 2C) for any sample type. Exposure to MH did not result in the loss of uropathogenic species present in catheterized urine at baseline;instead, additional uropathogenic and commensal microbiota were detected at the 3-month visit.

Conclusions:

UDI6 trended towards symptom improvement in frequency, urge incontinence, and pain, consistent with RUTI prevention and symptoms control. Microbiological results suggest that MH increases the richness of the bladder urobiome. This consistent trend suggests MH may reduce RUTI events by altering the urobiome community richness instead of eliminating uropathogenic microbiota from the bladder. Further studies are needed to understand the interaction between MH and a host that is susceptible to uropathogen overgrowth (Table Presented).
Keywords

Full text: Available Collection: Databases of international organizations Database: EMBASE Type of study: Cohort study / Experimental Studies / Observational study / Prognostic study Language: English Journal: Female Pelvic Medicine and Reconstructive Surgery Year: 2022 Document Type: Article

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Full text: Available Collection: Databases of international organizations Database: EMBASE Type of study: Cohort study / Experimental Studies / Observational study / Prognostic study Language: English Journal: Female Pelvic Medicine and Reconstructive Surgery Year: 2022 Document Type: Article