DOI: 10.36347/sasjs.2021.v07i10.005

Pages: 549-552

The Chemical composition of urinary stones at the Military Teaching Hospital of Cotonou. Objective: To determine the chemical composition of urinary stones in our patients. Patients and method: We collect surgically removed urinary stones from our patients and send them abroad for infrared spectroscopic analysis. Results: The infrared spectroscopic analysis was performed on urinary stones from 26 patients, i.e. 21 males (80.8%) and 5 females (19.2%). Their mean age was 48 years (range: 21-71). The mean proportions of chemical components in the stones were: 40.8% whewellite (0-97), 29.4% weddellite (0-95), 12.7% uric acid (0-90), 5.4% struvite (0-70), 5.2% carbonate apatite (0-20), 1.9% ammonium urate (0-20), 1.7% silicate (0-45), 1.3% protein (0-10), 1.2% whitlockite (0-10) and 0.1% hydroxyapatite (0-2). All stones were a mixture of 2 or 3 of the identified chemical components. Based on the main component, there were 3 groups of stones: the calcium oxalate stones (77%), the uric acid stones (15.4%) and struvite stones (7.7%). One calcium oxalate stone from a female comprised 45% silicate and 5% protein. There was no stone chemical composition difference between males and females. Conclusion: The stones from the 26 patients were mainly non pure calcium oxalate stones (73%), uric acid stones 8%) and struvite stones (4%).