Association Between Proton Pump Inhibitor Use and Extended-Spectrum Beta-Lactamase Urinary Tract Infection in Adults: A Retrospective Study

PURPOSE: To study the association between proton pump inhibitor (PPI) use and the risk of urinary tract infection (UTI) caused by extended-spectrum beta-lactamase-producing Enterobacteriaceae (ESBL). PATIENTS AND METHODS: A retrospective cross-sectional study was conducted between October 2018 and September 2019. Adults with ESBL-UTIs were compared to adults with UTIs caused by gram-negative bacteria (GNB) and those with UTIs caused by miscellaneous organisms. The association between ESBL infection and PPI use was assessed. RESULTS: A total of 117 of 277 ESBL cases, 229 of 679 non-ESBL GNB controls, and 57 of 144 non-ESBL miscellaneous controls were exposed to PPIs within 3 months prior to admission. The univariate analysis indicated unadjusted odds ratio for PPI exposure with ESBL infection versus the GNB controls was 1.43 (95% CI 1.07–1.90, P = 0.015) while the odds ratio for PPI exposure with ESBL infection versus miscellaneous organisms was 1.10 (95% CI 0.73–1.67, P = 0.633) indicating positive association (PPI exposure increases risk of ESBL infection). Multivariate analysis revealed a positive association between ESBL infection and PPI use versus the GNB controls with an odds ratio of 1.74 (95% CI 0.91–3.31). While Esomeprazole was positively associated with ESBL infection, particularly compared with the miscellaneous group (adjusted OR 1.35, 95% CI 0.47–3.88), Lansoprazole was inversely associated (adjusted OR 0.48, 95% CI 0.18–1.24 and adjusted OR 0.40, 95% CI 0.11–1.41 for ESBL versus GNB controls and ESBL versus miscellaneous organisms, respectively). CONCLUSION: Exposure to PPIs in the preceding 3 months showed an association with increased risk of ESBL-UTI. While Esomeprazole showed a positive association, Lansoprazole had an inverse association for ESBL-UTI. Restricting the use of PPIs may be beneficial in the fight against antimicrobial resistance.