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  • Title: [Changes in kidney stones type according to sex and age in Tunisian patients].
    Author: Alaya A, Nouri A, Belgith M, Saad H, Hell I, Hellara W, Jouini R, Najjar MF.
    Journal: Actas Urol Esp; 2012 Mar; 36(3):171-7. PubMed ID: 22178342.
    Abstract:
    BACKGROUND: Studies that evaluate the effect of age and gender on the stone composition are scarce. The aim of this study is to highlight the modification of epidemiological characteristics of this pathology according to patients' sex and age. PATIENTS AND METHODS: We studied 1269 urolithiasic patients ranging from 6 months to 92 years old and known as having urinary stones (752 males and 517 females). Stone analysis was performed respectively using a stereomicroscope and infrared spectroscopy to determine, respectively, the morphological type and molecular composition of each. RESULTS: The annual average incidence of new stone formation was 30.25 per 100,000 inhabitants. In 1041 patients (81%), calculi were located in the upper urinary tract. Children and old man were more affected by bladder stone. Calcium oxalate monohydrate remains the most frequent stone component even if its frequency fell according to age (63.2% in teenagers and 40.6% in elderly [p<0.05]) in favour of the increase of uric acid stones (3,5% in teenagers and 41.5% in elderly [p<0.05]). Struvite stones were rare (3.5%) and more frequent in children. CONCLUSION: The analysis of these data shows that urinary stones in Tunisia are tending to evolve in the same direction as in industrialized countries.
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