Bacterial Analysis of Kidney Stones Removed by Percutaneous Nephrolithotomy
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|ClinicalTrials.gov Identifier: NCT02739919|
Recruitment Status : Completed
First Posted : April 15, 2016
Last Update Posted : May 2, 2018
|Condition or disease|
Kidney stone disease is common, affecting nearly 10% of the population with increasing prevalence and increasing cost associated to treat this disease. While struvite stones (composed of magnesium, ammonium and phosphate crystals) have been associated with the presence of infection, the association between bacteria and non-infection stones is not well characterized. Previous studies have found bacteria present in stones of patients without active infection and with negative pre-operative urine tests.
There are various compositions of kidney stones, including calcium oxalate, calcium phosphate, struvite and uric acid, with calcium oxalate being the most common. It is well known that struvite stones are associated with active infection, however the role of bacteria in the formation of other types of kidney stones, including calcium oxalate, is not well understood. The investigators hypothesize that bacteria present in the urinary tract of patients without active infection have the ability to facilitate calcium oxalate crystal formation by providing a surface for stones to grow. An understanding of the role of bacteria in the formation of non-infection stones could help prevent stone formation by altering the bacteria present within patients to decrease or eliminate their risk of kidney stone disease.
|Study Type :||Observational|
|Actual Enrollment :||6 participants|
|Official Title:||Bacterial Analysis of Kidney Stones Removed by Percutaneous Nephrolithotomy|
|Study Start Date :||June 2016|
|Actual Primary Completion Date :||February 23, 2017|
|Actual Study Completion Date :||February 24, 2017|
- Amount of stone formation in artificial urine with isolated bacteria from non-infection kidney stones compared to control measured using FTIR-Microscopy and SEM (concentration measured in mg/mL). [ Time Frame: Through study completion, approximately 2 years ]Bacteria will be isolated from non-infection kidney stones allowed to form a biofilm. Next, the bacteria will be incubated in supersaturated artificial urine to precipitate stone formation in vitro and compared to control urine consisting of the same artificial urine without bacteria. Over time, crystallization in the biofilm will be measured using FTIR-Microscopy and SEM.
- Bacteria isolated from non-infection kidney stone compared to those identified on pre-operative urine test quantified by simple serial dilution and CFU counting (measured in CFU/mL) and identified using DNA sequencing. [ Time Frame: Through study completion, approximately 2 years ]Bacteria will be quantified using simple serial dilution and CFU counting and identified using DNA sequencing. Bacteria will then be correlated with the bacteria identified on pre-operative urine test.
Biospecimen Retention: Samples With DNA
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Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02739919
|Canada, British Columbia|
|The Stone Centre, VGH/UBC|
|Vancouver, British Columbia, Canada, V5Z 1M9|
|Principal Investigator:||Dirk Lange, MSc, PhD||University of British Columbia|
|Study Director:||Ben H Chew, MD||University of British Columbia|