Objective: to analyze short-term and long-term results of one-step surgery in resectable pancreatic head cancer (PHC), complicated by obstructive jaundice. Material and methods. The retrospective analysis of 123 consecutive cases of the surgical treatment of PHC has been performed. Group I (N = 33) consisted of patients with the total bilirubin level up to 100 µmol/l, group II (N = 31) - with the level of total bilirubin of 100-287 µmol/l who had undergone the one-step surgery. Group III (N = 59) included patients having undergone the surgical treatment with preoperative biliary drainage (PBD) in the form of the biliodigestive anastomoses or external drainage, with the total bilirubin level of 125-720 µmol/l. The frequency of postoperative complications, 90-day lethality and the overall survival rate were assessed by the Kaplan-Meier method. Results. The frequency of complications in the patients of groups I, II and III was 42.4, 48.4 and 35.6 %, lethality - 3.0, 3.2 and 6.8 %, respectively (P > 0.05); the 5-year survival rate - 39.7 ± 8.8 %, 30.1 ± 11.8 % and 4.9 ± 3.1 % (P = 0.004). Conclusion. The one-step surgical treatment of PHC with moderately severe obstructive jaundice was not accompanied with the increased frequency of postoperative complications and mortality. The overall survival rates were significantly higher in the patients undergoing the one-step surgery and did not correlate with the total bilirubin levels. The two-step surgery was accompanied by extremely low survival rates. The cancellation of the routine PBD procedure can be considered as one of the ways to improve the long-term outcomes of the PHC treatment.

Objective: to analyze the dynamics of the immediate and long-term results of the treatment of resectable pancreatic head cancer (PHC) for the period from 1989 to 2019. Material and methods. The retrospective analysis of 123 consecutive cases of the treatment of resectable PHC has been performed. During period I (from 1989 to 2000) 11 patients were operated, during period II (from 2001 to 2013) - 72, and period III (from 2014 to 2019) - 40 patients. The structure and frequency rate of postoperative complications, 90-day mortality and the overall survival rate (by the Kaplan-Meier method) have been assessed. Results. The frequency rate of the postoperative complications in I, II, and III periods were 63.6, 48.6, and 52.5%, mortality - 0, 5,6 and 5.0 %, respectively (P > 0.05). The most common complication and cause of death in all the cases were pancreatic fistula. The indicators of the 3-year survival in I, II, and III periods were 10.0 ± 9.5 %, 18.5 ± 4.7 % and 35.3 ± 9.6 %, the median survival - 10, 13, and 22 months, respectively (P = 0.07). Conclusion . A high frequency rate of the postoperative complications with a relatively low rate of the postoperative mortality was observed in all the analyzed periods. Pancreatic fistula prevailed in the structure of the complications and was the cause of death in all the cases. In the last period there was a clear tendency to improve the long-term results of the treatment, which may be due to more active surgical tactics, increased frequency of combined operations with the resection of vessels and proportional decrease in the share of palliative (R2) operations, standardization of the volume of lymph node dissection, an increased proportion of one-stage operations and increasing the number of patients receiving adjuvant chemotherapy.

The article is devoted to the theoretical substantiation of new direction in geological exploration of the Bazhenov Formation – the technology of pulsed electromagnetic cross-well exploration, which is based on the idea of involving a system of vertical and horizontal wells drilled in target objects of Lower Cretaceous and Upper Jurassic deposits. The high potential and new capabilities of the proposed technology are demonstrated on realistic models of well sections of the East-Surgut field (Latitudinal Ob Region). Based on the results of numerical simulation, it was found that electromagnetic signals have a high level and sensitivity to the geoelectric parameters of the Bazhenov Formation, which ensures its cross-well exploration at a considerable distance between wells with sources and receivers. The performed research significantly expands opportunities of electromagnetic sounding by the method of transient processes as applied to the tasks of oilfield geophysics in new formulations.

The work describes a clinical case of urgent percutaneous dilational tracheostomy in complicated conditions. The surgery was performed on a 47-year-old patient with decompensated stenosis of the larynx associated with a massive recurrent malignant tumor of the thyroid gland. It was not possible to perform a standard tracheostomy procedure due to widespread tumor infiltration of the trachea and soft tissues of the neck, extensive scars after previous operations, the inability to extend the neck due to Bekhterev’s disease. In addition, the patient developed severe dyspnoea in the supine position. Given the above, low percutaneous dilational tracheostomy was performed under local anesthesia directly above the jugular notch of the sternum in the patient’s sitting position. Due to the absence of specialized tools at the General Surgery Department of the Central District Hospital, a set for percutaneous nephrostomy was used. This technique can be used in urgent situations when it is impossible to perform standard conicotomy or tracheostomy.

This work is devoted to a numerical analysis of influence of the well zenith angle and geoelectrical parameters of the medium on signals of the electromagnetic logging tool with toroidal coils, based on 3D finite-difference modeling.