Introduction. There are various alternatives available for renal pelvis drainage following pyeloplasty. One of them is the use of an internal-external diversion stent, which according to our protocol, is knotted 48 hours following surgery, prior to discharge, and removed 7 days later on an outpatient consultation basis, with no sedation or analgesia required.Objective. To analyze the results of patients under one year of age who underwent open pyeloplasty associated with an outpatient internal-external diversion stent.Materials and methods. A retrospective, descriptive analysis of 28 patients (31 renal units) undergoing surgery from 2011 to 2021 was carried out. Diagnostic methods, indications, surgical approach, and postoperative progression were assessed.Results. 28 patients (23 male) prenatally diagnosed with hydronephrosis confirmed by ultrasonography and/or renogram underwent pyeloplasty at a median age of 3 months (15 days-11 months). Pyeloplasty was conducted according to the Anderson-Hynes technique or dismembered pyeloplasty in 28 renal units, and according to the Culp-DeWeerd technique or spiral flap in 3. In all cases, an internal-external diversion stent was used according to our protocol. Mean hospital stay was 3.5 days (2-7 days), with a good postoperative progression. 2 patients had complications (urinary infection requiring intravenous antibiotics, and pyonephrosis requiring re-pyeloplasty).Conclusions. Using an internal-external diversion stent following pyeloplasty in patients under 1 year of age with ureteropelvic junction obstruction is a simple and safe option that allows for early discharge with outpatient management. It also avoids a second general anesthesia for drainage catheter removal purposes.

Introduction. The various surgical specialties in our center have used the simulation and experimental surgery resources available for their training tasks in minimally invasive surgery (MIS) in an individualized manner. With this learning model, a great dispersion of effort and expense was observed, so it was decided to create a unified program based on the following: shared learning, synergy among specialties, moderation of the economic cost, and rational use of the facilities.Objective. To describe and assess our consensually designed training program in order to consolidate a shared learning strategy that will enable our residents to acquire and perfect surgical skills in MIS.Materials and methods. The program consists of various increasingly complex phases implemented on a continuous basis throughout the period of specialized training in the virtual laboratory and experimental operating room. The assessment methods were based on quantifiable criteria: percentage of efficiency and completion time of the "McGill Inanimate System for Training and Evaluation of Laparoscopic Skills" (MISTELS) exercises at the beginning and end of the program. An economic study was also conducted.Results. 20 residents have completed the program. Mean times show a significant reduction in each of the exercises. The efficiency percentages at the end of the program were higher than at the beginning (p < 0.001). The cost of the program represented a saving of 67.89%. Conclusion.The new MIS training program improved the quality of learning in a safe environment, establishing common criteria among the different specialties and an improved use of resources.