Infective Urolithiasis: A Descriptive Study


Abstract:Objective: To demonstrate the relation between the type of calculi and the presence of pathogenic bacteria.Patients and methods: A group of 53 patients (35 males & 18 females) with urolithiasis were studied from January 2009 to January 2011. Their age ranged (13 – 69 years) with a mean age of 36.5 years. Calculi were obtained by different means & then submitted to chemical analysis. Cultures of pre-operative mid stream urine samples for bacteria were performed in all patients. Results: The overall incidence of renal stone was more in males (66%) in comparison to females (34%); however the rate of infection stones was more in females (83.33%). Chemical analysis revealed that calcium oxalate was the most common & frequently occurring calculi (54.7% pure & 9.5% mixed) while triple phosphate stones were only (11.3%). The commonest pathogen recovered from pre-operative urine culture was E-coli (40%) followed by Proteus (30%). Out of 20 infection stones, 5 stones which were composed of triple phosphate showed the highest incidence of infection (83.33%).Conclusion: Despite overall increased incidence of renal stones in men, women are more prone to struvite stones than men due to chronic bacterial infection in the urinary tract which women are more prone to get.