The article describes the results of a study of changes in the composition and hydrogeochemical parameters of individual areas and fields of the Bukhara-Khiva region based on well materials. Vertical zonality of hydrogeochemical parameters associated with deep fluid flow and heat and mass transfer is noted. The manifestation of tectonodynamic conditions in the Mesozoic-Cenozoic history of the region, which served as a prerequisite for the formation of weakened zones (channels of deep heat and mass transfer) in the field of tensile stresses for the vertical migration of fluids and juvenile gases, is noted. A hydrogeological criterion for identifying zones of deep heat and mass transfer and vertical fluid migration is proposed. Keywords: wells; oil and gas; formation waters; fluids; hydrogeochemical indicators of formation waters; heat and mass transfer.
Aim. To evaluate the late results of staged endoscopic treatment of patients with corrosive bile duct strictures.Materials and methods. The study included 41 patients with corrosive bile duct strictures varying in etiology and localization. The patients were observed over a seven-year period, most of whom had already undergone endoscopic treatment.Results. The technical success rate amounted to 100%. The procedure of staged stenting was completed in 34 out of 37 patients under observation. The clinical success rate, defined as the release of a stricture, reached 94%. In the postoperative period, the incidence of complications amounted to 8.8%. Only 2 out of 34 patients who had undergone stenting exhibited stricture recurrence.Conclusion. The staged placement of multiple plastic stents is characterized by high technical and clinical success rates while involving few complications, as well as a consistently low rate of stricture recurrence in the long-term period.
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