Multidrug-resistant bacteria in urine culture among patients with spinal cord injury and disorder: Time to first detection and analysis of risk factors

Study design: Retrospective cohort study.

Objectives: The aim of this study was to assess the time to first detection of multidrug-resistant bacteria (MDRB) in urine culture and identify risk factors associated with the first detection of MDRB (1^st MDRB).

Setting: Spinal Care Ward and Department of Microbiology, Regional Hospital Liberec a.s., Liberec, Czech Republic.

Method: We cultured urine samples from patients in the acute phase of spinal cord injury or disorder (SCI/D). Multidrug resistance (MDR) was defined as acquired nonsusceptibility to at least one agent from three or more antimicrobial categories. Multivariate logistic regression was used to assess the association of bladder management, broad-spectrum antibiotic exposure, mechanical ventilation, pressure ulcers, positive urine culture on admission, and other risk factors with 1^st MDRB. We used only the first urine culture with MDRB for evaluation.

Results: A total of 655 urine cultures from 246 individuals were evaluated, and 829 isolates were obtained. The MDRB prevalence among all isolates was 40.2%. MDRB was detected in 146 (59.3%) patients for the first time, and 76.0% of these isolates were from patients with asymptomatic bacteriuria. The median time to 1^st MDRB was 37 days (95% CI, 33-41). According to multivariate logistic regression, 1^st MDRB was associated with bladder management with urethral or suprapubic catheterization (OR: 2.8, 95% CI, 1.1-7.2).

Conclusion: The prevalence of infections caused by MDRB was high among the SCI/D population, with three-quarters from patients with asymptomatic bacteriuria. Bladder management with an indwelling catheter is associated with an increased risk of 1^st MDRB.