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Laparoscopic Transperitoneal Pyeloplasty for Ureteropelvic Junction Obstruction: Preliminary Results from 26 Cases

Surgical Science 2023年第5期14卷 309-320页

作者： Cyril Kamadjou Divine Enoru Eyongeta Annie Kameni Wadeu patrick fotso gwabap Bertin Njinou Ngninkeu Edouard Hervé Moby Medico Surgical Centre of Urology and Mini Invasive Surgery Douala Cameroon Department of Surgery and Specialties Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Department of Surgery Faculty of Health and Sciences University of Buea Buea Cameroon Clinic of Aeroport Douala Cameroon

Background and Objectives: Pyelo-Ureteral Junction Syndrome (PUJS) is the most common obstructive malformation of the upper urinary tract in children and adults. The standard treatment is open pyeloplasty using the Kuss-Anderson technique. Because of the minimally invasive nature of the laparoscopic approach, it has become the approach of choice for the management of this pathology. We present the results of laparoscopic transperitoneal pyeloplasty used in the management of PUJS. Materials and Methods: This was a retrospective study from 2015 to 2020, including 26 patients who underwent laparoscopic transperitoneal pyeloplasty for PUJS. Results: Twenty-six patients, including 18 (69.2%) men and 6 (30.8%) women, with a mean age of 35.42 ± 13.62 years, were treated. Renal colic was the primary symptom in the majority of the cases (22, 84.6%)). The diagnosis was confirmed in all patients through an abdominal CT scan, which revealed that all 26 patients had hydronephrosis. Half of the patients (50.0%) were classified as Valayer-Cendron Type II, and eight (30.8%) patients had associated stones. Seventeen (65.4%) patients had pathologies on the left side, and all patients were treated using the Kuss-Anderson technique with a median operating time of 108.5 (90.0 - 136.0) minutes. The uncrossing of lower pole vessels was performed in 10 patients. The average duration of hospitalisation was 2.23 ± 0.82 days. No conversion was observed, and after an average follow-up of 53.69 days, the success rate was 92.3%. Conclusion: Laparoscopic pyeloplasty is a minimally invasive technique of choice for the treatment of pyelo-ureteral junction obstruction. It is dependable, repeatable, and produces good functional outcomes that are equal to those of traditional surgery.

关键词： Pyelo-Ureteral Junction Lower Pole Vessel Pyeloplasty Double J Stent

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Generating Efficient Solutions in Bilevel Multi-Objective Programming Problems

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American Journal of Operations Research 2013年第2期3卷 289-298页

作者： Calice Olivier Pieume Patrice Marcotte Laure Pauline fotso patrick Siarry Department of Computer Science and Operations Research University of Montreal Montreal Canada Department of Computer Sciences Faculty of Science University of Yaoundé I Yaoundé Cameroon Department of Mathematics Faculty of Science University of Yaoundé I Yaoundé Cameroon LISSI Faculty of Sciences and Technology University of Paris XII Val-de-Marne Créteil France

In this paper, we address bilevel multi-objective programming problems (BMPP) in which the decision maker at each level has multiple objective functions conflicting with each other. Given a BMPP, we show how to construct two artificial multiobjective programming problems such that any point that is efficient for both the two problems is an efficient solution of the BMPP. Some necessary and sufficient conditions for which the obtained result is applicable are provided. A complete procedure of the implementation of an algorithm for generating efficient solutions for the linear case of BMPP is presented. A numerical example is provided to illustrate how the algorithm operates.

关键词： Multi-Objective Programming Bilevel Programming Efficient Solution Efficient Edge Hierarchical Systems

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Solving Bilevel Linear Multiobjective Programming Problems

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American Journal of Operations Research 2011年第4期1卷 214-219页

作者： Calice Olivier Pieume Patrice Marcotte Laure Pauline fotso patrick Siarry 不详

This study addresses bilevel linear multi-objective problem issues i.e the special case of bilevel linear programming problems where each decision maker has several objective functions conflicting with each other. We introduce an artificial multi-objective linear programming problem of which resolution can permit to generate the whole feasible set of the upper level decisions. Based on this result and depending if the leader can evaluate or not his preferences for his different objective functions, two approaches for obtaining Pareto- optimal solutions are presented.

关键词： Multiobjective Programming Bilevel Programming Feasible Solution Pareto-Optimal Solutions

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A Mathematical Model of Tuberculosis with Drug Resistance Effects

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Applied Mathematics 2016年第12期7卷 1303-1316页

作者： Marilyn Ronoh Rym Jaroudi patrick fotso Victor Kamdoum Nancy Matendechere Josephine Wairimu Rose Auma Jonnes Lugoye University of Nairobi Nairobi Kenya University of Tunis El Manar Tunis Tunisia University of Dschang Yaounde Cameroon Kenyatta University Nairobi Kenya University of Dar es Salaam Dar es Salaam Tanzania

Despite the enormous progress in prevention and treatment, tuberculosis disease remains a leading cause of death worldwide and one of the major sources of concern is the drug resistant strain, MDR-TB (multidrug resistant tuberculosis) and XDR-TB (extensively drug resistant tuberculosis). In this work, we extend the standard SEIRS epidemiology model of tuberculosis to include MDR-TB. For that, we considered compartments of susceptible, exposed, infected, resistant to a first line of treatment and recovered humans and we modeled the natural growth, the interactions between these populations and the effects of treatments. We calculate the basic reproduction number, , using the next generation method. The DFE and the EE are established and their stability analysis done to show that they are locally and globally asymptotically stable. Numerical analysis for the model with and without delay is done and demonstrated that in the case of patients with both active tuberculosis and MDR tuberculosis, both strains will still persist due to lack of permanent immunity to tuberculosis while the recovered can still lose their immunity to become susceptible again.

关键词： Tuberculosis Mtb MDR Reproduction Number DFE EE Stability

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