New urinary microbiome study could be first step in providing personalized care to patients with ureteral stents

LONDON, ONTARIO - For patients with kidney stones, ureteral stents (hollow devices placed in the ureter – the tube between the kidney and bladder) can be used temporarily to relieve urinary obstruction. Despite the use of antibiotics, ureteral stents often become encrusted with minerals and coated with bacteria. This can lead to complications like infection and the need for replacement surgery. 

Published today in Cell Reports Medicine, researchers at Lawson Health Research Institute and Western University conducted a novel microbiome study to examine bacteria associated with ureteral stents. They found that nearly all the stents, whether visibly coated or not, had unique bacterial profiles that were most associated with a patient’s medical condition rather than antibiotic use. For patients with ureteral stents, they may benefit from a personalized approach to care and antibiotic treatment. 

The study included 241 patients from St. Joseph’s Health Care London. The research team collected and analyzed patient urine samples and ureteral stents following surgical removal, as well as relevant patient information such as antibiotic use and history of infections.  

“We wanted to know which bacteria were present and whether the bacteria found in urine samples corresponded to the bacteria found on a patient’s stent,” explains Dr. Kait Al, Postdoctoral Fellow at Lawson and at Western’s Schulich School of Medicine & Dentistry. “We found that there was a bacterial community present on almost all stents, even if they were not visibly affected, and that it differed from the bacterial community found in a patient’s urine.”

These findings challenge long-held beliefs that the urinary tract is a sterile environment devoid of bacteria.

The study revealed that the bacteria present were determined by an individual patient’s medical condition. They differed significantly based on comorbidities like irritable bowel syndrome, obesity and hypertension. Antibiotic use within the past 30 days did not seem to have an effect on the types of bacteria detected on the stents. 

“While more research is needed, our study suggests that antibiotic use during the placement of these stents could one day be more conservative or targeted based on each patient’s condition,” says Dr. Jeremy Burton, Lawson Scientist and Associate Professor at Schulich Medicine & Dentistry.

The team also discovered that in patients needing multiple stents, the bacterial community remained stable over time, suggesting that infections on a patient’s previous stent could direct the course of treatment for their future device placements. 

“This is the largest study of its kind, investigating bacteria both in urine and adhered to ureteral stents,” states Dr. Hassan Razvi, Urologist at St. Joseph’s, Lawson Associate Scientist and Professor at Schulich Medicine & Dentistry. “We hope this will be the first step towards personalized care, ultimately leading to fewer stent-associated infections.” 

The study was made possible through the generous support of The W. Garfield Weston Foundation and St. Joseph’s Health Care Foundation.

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Scanning electron microscopy images showing organic material, crystals, and bacteria present on the surface of the ureteral stents.

Recovered ureteral stent encrusted with minerals and bacteria. 

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