These findings suggest that changing the gastric pH alone does not modify the net intestinal absorption of several minerals from food. Therefore, it is unlikely that moderate hypochlorhydria resulting from short-term omeprazole treatment substantially increases the risk for developing calcium, phosphorus, magnesium, or zinc deficiencies due to mineral malabsorption.

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Introduction. Сurrently, existing methods for determining the chemical composition of the stone in vivo do not have the necessary accuracy. In this regard, the development of methods for high-precision determination of the chemical nature of urinary stones using modern technologies is relevant for modern urology. Materials and methods. 72 patients with urolithiasis who were treated at the Institute of urology and interventional radiology. N.A. Lopatkin – a branch of the Federal state budgetary institution «NMIC of radiology» of the Ministry of health of Russia, along with standard methods of examination, performed the determination of the chemical composition of urinary stones using infrared spectroscopy. Urinary stones were classified according to the predominant mineral component into six main types (calcium-oxalate, uric acid, calcium phosphate, magnesium-ammonium-phosphate, urate–ammonium and mixed), as well as determining the nutrition stereotype for 25 nutrients using an electronic questionnaire. The classification model was built using the tools of a modern set of Data mining methods-IBM SPSS Modeler 18.0 (IBM Corporation, USA). Results. the data set includes the results of the survey of pattern of food and chemical composition analysis of urinary stones on the basis of which a model was produced, allowing high-precision to predict in vivo chemical type of urinary stones. The constructed machine-learning model (C5.0 algorithm) has high predictive accuracy (98.6-100%), specificity (98.2-100%), and sensitivity (100% for the main types of stones and 75.0% for mixed ones). Conclusions. the Developed method for determining the chemical composition of urinary calculus in vivo based on the indicators of the patients nutrition stereotype has a high specificity, sensitivity and accuracy, which allows using this prognostic model in clinical practice.

Introduction. The lithogenesis causes study is extremely important for the surgical treatment tactics determining and for urolithiasis metaphylaxis. Materials and methods. It was used data published in the PubMed databases, the scientific electronic library eLibrary.ru, and on the website of the European Association of Urology. Results. According to modern concepts of the lithogenesis, urolithiasis is a polyetiological and polypathognomonic disease. Renal tubular acidosis (RTA) is the most studied tubulopathy leading to stone formation. Present literature review introduce genetic mutations, describes diseases and conditions leading to urolithiasis and RTA. We have given in detail the features of the urolithiasis course in RTA patients. Methods for RTA diagnosing, features of drug therapy and urolithiasis metaphylaxis in RTA patients, and criteria for evaluating the effectiveness of therapy are in a special place in the review. Conclusion. It is important for a practicing urologist to remember that distal RCA may be one of the causes of lithogenesis in patients with recurrent urolithiasis. The main diagnostic criteria are specific changes in the parameters of the biochemical analysis of blood, daily urine, as well as specific indicators of urine pH.