25 results on '"Pereira X"'
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2. Laparoscopic hepatectomy for hepatocellular carcinoma: A study on the adoption at a large academic center
- Author
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Pereira, X., primary, Mandujano, C.C., additional, Romero-Velez, G., additional, Bellemare, S., additional, Kinkhabwala, M., additional, and Rocca, J.P., additional
- Published
- 2020
- Full Text
- View/download PDF
3. Diseño, simulación y validación por elementos finitos de sistemas flexure para aplicaciones micro-robóticas
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Angulo-Elizari, E. (Enrique), Celigüeta-Lizarza, J.T. (Juan Tomás), and Justo Pereira, X.(Xabier)
- Abstract
El documento aquí presentado corresponde a la memoria de un proyecto realizado durante el primer semestre del año 2017 en el Centro de Estudios e Investigaciones Técnicas de Guipúzcoa bajo la dirección de Juan Tomás Celigüeta. El proyecto busca otorgar el título de ingeniero mecánico a Enrique Angulo Elizari, graduado por la Escuela de Ingenieros de la Universidad de Navarra, TECNUN, en el grado de ingeniería mecánica. Hoy en día, las aplicaciones tecnológicas buscan la miniaturización de los productos de forma que sean más manejables. Dicha necesidad lleva a la tecnología a crear nuevas maneras de trabajar, dando lugar así a la micro-robótica. Este desarrollo de nuevas tecnologías ha facilitado muchos procesos. A pesar de esto, el reto está en producirlos a un coste económico. Las aplicaciones son variadas, desde el sector de la automoción hasta la biomedicina, donde está siendo imprescindible su desarrollo. El proyecto se basa en el diseño y validación de unos sistemas flexibles para aplicaciones micro-robóticas, centradas en el mundo clínico. El proyecto consiste en diseñar un sistema de varios grados de libertad que permita realizar movimientos, principalmente giros, del orden micro y nano. Para esto es imprescindible la geometría y los materiales usados. El proyecto tiene tres fases principales: el análisis de sistemas ya existentes sometidos a esfuerzos comparados con sus modelos matemáticos teóricos, el diseño de nuevos sistemas y su validación por métodos numéricos usando programas de simulación por elementos finitos. En una cuarta fase, se estudiará la posibilidad de medir experimentalmente los resultados obtenidos anteriormente mediante un sistema de galgas extensiométricas. Además, se estudiarán sus técnicas de fabricación. En este documento están desarrolladas las tres primeras partes del proyecto total. The following document corresponds to the report of a project carried out during the first semester of the year 2017 in the Centre of Studies and Technical Research of Guipúzcoa under the guidance of Juan Tomás Celigüeta. The project seeks to award the title of mechanical engineer to Enrique Angulo Elizari, graduated by the School of Engineers of the University of Navarra, TECNUN, with mechanical engineering bachelor. Nowadays, the technology seeks the miniaturization of the products in order to make them more portable and more manageable. This necessity urges to the technology to develop new working methods, thus giving rise to micro-robotics. This development has provided advantages to many processes. Besides this, the challenge is to produce them at an economic cost. The applications are multiple, from the automotive uses until biomedicine, where its development is being essential. The project is based on the design and validation of some flexure systems with micro-robotics applications, focused on medical uses. The project consists on the design a system of several degrees of freedom, which allows to produce movements, mainly rotations, measuring in micro and nano orders. For that is essential the geometry and materials used. The project has three phases: the analysis of some commercial systems submitted to efforts and comparing with their theoretical mathematical models, the design of new systems and their validation with numeric methods using finite elements simulation programs. In a fourth phase, the project will study the availability of measuring, experimentally, with strain gauges the results obtained in the simulations. Moreover, the project will study the fabrication methodologies available for those systems. In this report the three first phases of the whole project are described.
- Published
- 2019
4. Proceso de fabricación y sistema de medición de sistemas flexure para aplicaciones micro-robóticas
- Author
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Angulo-Elizari, E. (Enrique), Celigüeta-Lizarza, J.T. (Juan Tomás), and Justo Pereira, X.(Xabier)
- Abstract
El documento aquí presentado corresponde a la memoria de un proyecto realizado durante el primer semestre del año 2017 en el Centro de Estudios e Investigaciones Técnicas de Guipúzcoa bajo la dirección de Juan Tomás Celigüeta. El proyecto busca otorgar el título de ingeniero mecánico a Enrique Angulo Elizari, graduado por la Escuela de Ingenieros de la Universidad de Navarra, TECNUN, en el grado de ingeniería mecánica. Hoy en día, las aplicaciones tecnológicas buscan la miniaturización de los productos de forma que sean más manejables. Dicha necesidad lleva a la tecnología a crear nuevas maneras de trabajar, dando lugar así a la micro-robótica. Este desarrollo de nuevas tecnologías ha facilitado muchos procesos. A pesar de esto, el reto está en producirlos a un coste económico. Las aplicaciones son variadas, desde el sector de la automoción hasta la biomedicina, donde está siendo imprescindible su desarrollo. El proyecto se basa en el diseño y validación de unos sistemas flexibles para aplicaciones micro-robóticas, centradas en el mundo clínico. El proyecto consiste en diseñar un sistema de varios grados de libertad que permita realizar movimientos, principalmente giros, del orden micro y nano. Para esto es imprescindible la geometría y los materiales usados. El proyecto tiene tres fases primarias: el análisis de sistemas ya existentes sometidos a esfuerzos comparados con sus modelos matemáticos teóricos, el diseño de nuevos sistemas y su validación por métodos numéricos usando programas de simulación por elementos finitos. En una cuarta fase, se estudiará la posibilidad de medir experimentalmente los resultados obtenidos anteriormente mediante un sistema de galgas extensiométricas. Además, se estudiarán sus técnicas de fabricación. Este documento desarrolla la cuarta y quinta fase del proyecto que consisten en los procesos de fabricación y el sistema de medida que se va a instalar en las piezas. Se presentan diversas metodologías de fabricación y sobre estas se realiza una propuesta para los sistemas tratados en este proyecto. Con la parte de medición, se va a proponer una instalación para cada uno de los sistemas bajo la misma metodología de galgas extensiométricas. The following document corresponds to the report of a project carried out during the first semester of the year 2017 in the Centre of Studies and Technical Research of Guipúzcoa under the guidance of Juan Tomás Celigüeta. The project seeks to award the title of mechanical engineer to Enrique Angulo Elizari, graduated by the School of Engineers of the University of Navarra, TECNUN, with mechanical engineering bachelor. Nowadays, the technology seeks the miniaturization of the products in order to make them more portable and more manageable. This necessity urges to the technology to develop new working methods, thus giving rise to micro-robotics. This development has provided advantages to many processes. Besides this, the challenge is to produce them at an economic cost. The applications are multiple, from the automotive uses until biomedicine, where its development is being essential. The project is based on the design and validation of some flexure systems with micro-robotics applications, focused on medical uses. The project consists on the design a system of several degrees of freedom, which allows to produce movements, mainly rotations, measuring in micro and nano orders. For that is essential the geometry and materials used. The project has three phases: the analysis of some commercial systems submitted to efforts and comparing with their theoretical mathematical models, the design of new systems and their validation with numeric methods using finite elements simulation programs. In a fourth phase, the project will study the availability of measuring, experimentally, with strain gauges the results obtained in the simulations. Moreover, the project will study the fabrication methodologies available for those systems. In this report the fourth and fifth phases are described. This are the fabrication processes and the measurement system which is going to be installed in the systems. First, some fabrication processes are presented and taking account all of them, one proposal will be done for the systems developed. According to the measurement system, there will be a different proposal for each system but all of them under strain gauges bases.
- Published
- 2017
5. Processos e problemas na urbanização da América Latina: teoria e história
- Author
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Pereira X. P. C., Paulo Cesar, primary
- Published
- 2016
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6. INVESTORS IN PEOPLE, A STRATEGY TO IMPROVE EXISTING GOOD PRACTICE.
- Author
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Nadarajah, V. D., Yusoff, N., Ogle, J. J., and Pereira, X.
- Published
- 2003
7. Transfer reactions induced with $^{56}$Ni: shell gaps and np pairing
- Author
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Georgiadou, A., Assié, M., Blumenfeld, Y., Le Crom, B., Guillot, J., Flavigny, F., Achouri, L., Aouadi, M., Bastin, B., Benitez, A., Borcea, R., Catford, W., Clement, E., Corsi, A., Defrance, G., Delattre, M-C, Delaunay, F., Séréville, N., Deshayes, Q., Fernandez, B., Fisichella, M., Franchoo, S., Gibelin, J., Gillibert, A., Hammache, F., Kamalou, O., Knapton, A., Lapoux, V., Leblond, S., Marques, M., Matta, A., Morfouace, P., Orr, N., Pancin, J., Pereira, X., Perrot, L., Pollacco, E., Ramos, D., Roger, T., Rotaru, F., Scarpaci, J-A, Matthieu Sénoville, Sorlin, O., Stanoiu, M., Stefan, I., Suzuki, D., Thomas, J-C, Vandebrouck, M., Verde, G., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Pairing ,Transfer reaction ,Nuclear structure ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment - Abstract
International audience; The structure of the unstable doubly magic nucleus $^{56}$Ni has been investigated by measuring one-and two-nucleon transfer reactions. The radioactive beam of $^{56}$Ni was produced at GANIL-Caen, France at 30 MeV/u by means of the LISE spectrometer. The experimental setup used consists of the TIARA-MUST2-EXOGAM combination which provides an almost 4$\pi$ coverage and the ability to perform particle-$\gamma$ coincidences. To probe the N=28 gap, we studied the spectroscopy of $^{55}$Ni through one-nucleon transfer reactions on $^{56}$Ni. The excitation energy spectrum is deduced by measuring the light ejec-tiles only, while particle-$\gamma$ coincidences are used to improve the resolution of the populated states and select the main ones. Comparison between the extracted angular distributions and DWBA calculations allows the extraction of the spectroscopic strength of the hole-and particle-states populated by these one neutron pickup reactions.
8. Self-reported tobacco smoking practices among medical students and their perceptions towards training about tobacco smoking in medical curricula: A cross-sectional, questionnaire survey in Malaysia, India, Pakistan, Nepal, and Bangladesh
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Shah Mohsin, Pereira Xavier V, Islam Md R, Rahman Mahbubur, Kumar HN Harsha, Menezes Ritesh G, Suri Sushil, Sreeramareddy Chandrashekhar T, Sathian Brijesh, Shetty Ullasa, and Vaswani Vina R
- Subjects
Public aspects of medicine ,RA1-1270 ,Social pathology. Social and public welfare. Criminology ,HV1-9960 - Abstract
Abstract Background Tobacco smoking issues in developing countries are usually taught non-systematically as and when the topic arose. The World Health Organisation and Global Health Professional Student Survey (GHPSS) have suggested introducing a separate integrated tobacco module into medical school curricula. Our aim was to assess medical students' tobacco smoking habits, their practices towards patients' smoking habits and attitude towards teaching about smoking in medical schools. Methods A cross-sectional questionnaire survey was carried out among final year undergraduate medical students in Malaysia, India, Nepal, Pakistan, and Bangladesh. An anonymous, self-administered questionnaire included items on demographic information, students' current practices about patients' tobacco smoking habits, their perception towards tobacco education in medical schools on a five point Likert scale. Questions about tobacco smoking habits were adapted from GHPSS questionnaire. An 'ever smoker' was defined as one who had smoked during lifetime, even if had tried a few puffs once or twice. 'Current smoker' was defined as those who had smoked tobacco product on one or more days in the preceding month of the survey. Descriptive statistics were calculated. Results Overall response rate was 81.6% (922/1130). Median age was 22 years while 50.7% were males and 48.2% were females. The overall prevalence of 'ever smokers' and 'current smokers' was 31.7% and 13.1% respectively. A majority (> 80%) of students asked the patients about their smoking habits during clinical postings/clerkships. Only a third of them did counselling, and assessed the patients' willingness to quit. Majority of the students agreed about doctors' role in tobacco control as being role models, competence in smoking cessation methods, counseling, and the need for training about tobacco cessation in medical schools. About 50% agreed that current curriculum teaches about tobacco smoking but not systematically and should be included as a separate module. Majority of the students indicated that topics about health effects, nicotine addiction and its treatment, counselling, prevention of relapse were important or very important in training about tobacco smoking. Conclusion Medical educators should consider revising medical curricula to improve training about tobacco smoking cessation in medical schools. Our results should be supported by surveys from other medical schools in developing countries of Asia.
- Published
- 2010
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9. Implementation and finite-element analysis of shell elements confined by Through-The-Thickness uniaxial devices
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SESSA, SALVATORE, ROSATI, LUCIANO, Serpieri, Roberto, Salvatore Sessa, Roberto Serpieri, Luciano Rosati, H. Varum, J. M. Castro, L. Macedo, N. Pereira, X. Romao, G. Monti, Sessa, Salvatore, Serpieri, Roberto, and Rosati, Luciano
- Subjects
OpenSees, Shell, Through-the-Thickness, Confinement, Jacketing - Abstract
This contribution presents the implementation in OpenSees of an integration procedure based on a recently developed theory concerning stress integration along the chords of a shell element reinforced with uniaxial transverse links. Such a model has been developed in order to account for transverse confinement effects induced by through-the-thickness jacketing of masonry and reinforced concrete existing structures. In particular, transverse confinement induces a triaxial stress state in the core material of the shell increasing the stress spherical part and resulting in strength and ductility increments. In order to perform structural analyses with reduced computational costs, the presented tool permits to compute the response of plane elements confined by uniaxial devices. To this end, the implemented object accounts for the mutual interaction of uniaxial reinforcements with a triaxial core by means of equilibrium and compatibility equations involving several object classes of the OpenSees framework. Integration of the triaxial stress state along the thickness of a shell element is therefore performed by numerically solving the equilibrium/compatibility equation system. The adopted implementation strategy is summarized and modeling features are discussed. In conclusion, numerical examples show some possible applications of the proposed tool in common structural design practices.
- Published
- 2017
10. Gastric bypass revisional surgery: percentage total body weight loss differences among three different techniques.
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Estrada A, Rodriguez-Quintero JH, Pereira X, Moran-Atkin E, Choi J, and Camacho D
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- Adult, Female, Humans, Male, Middle Aged, Cohort Studies, Retrospective Studies, Gastric Bypass methods, Obesity, Morbid surgery, Reoperation, Weight Loss
- Abstract
Introduction: Suboptimal weight loss or weight regain may occur after Roux-en-Y gastric bypass (RYGB). For this reason, revisional surgery has gained increasing interest. We aimed to compare the percentage of total body weight loss (%TBWL) at one-year follow-up among three different techniques: Jejuno-jejunostomy distalization (JJD), Sleeve resection of the gastrojejunostomy and gastric pouch (SRGJP), and the combination of both (JJD + SRGJP)., Methods: This retrospective cohort study included all patients who underwent revisional surgery after RYGB (2020-2021). The cohort was stratified by the type of revisional technique performed. Postoperative bariatric outcomes and nutritional deficiencies were compared among groups., Results: A total of 78 patients underwent revisional surgery after RYGB: JJD was performed in 8 (10.3%), SRGJP in 34 (43.6%), and JJD + SRGJP in 36 (46.1%) patients. The most common indication for surgery was weight regain, in 72 (92.3%) patients. The median lengths of the BP limbs before and after distalization, were 50 cm (IQR 40-75 cm) and 175 cm (IQR 150-200 cm), respectively. The median length of the new common limb (NCL) and total alimentary limb length (TALL) were 277 cm (IQR 250-313 cm) and 400 cm (IQR 375-475 cm), respectively. Median percentage of total body weight loss (%TBWL) at one year was 15% (IQR 15-19%) for JJD, 20% (IQR 13-26%) for SRGJP, and 21% (IQR 15- 28%) for JJD + SRGJP (p = 0.40)., Conclusions: In this study, the combined procedure (JJD + SRGJP) exhibited higher %TBWL at one year, however no statistically significant difference was identified among the three techniques., (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
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- 2024
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11. Decreasing Surgical Site Infection Associated with the Use of Circular Staplers During Roux-En-Y Gastric Bypass.
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Garcia Cabrera AT, Romero-Velez G, Pereira X, Vazzana JT, and Camacho DR
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- Humans, Surgical Wound Infection epidemiology, Surgical Wound Infection prevention & control, Povidone-Iodine, Body Mass Index, Gastric Bypass adverse effects, Abdominal Wall
- Abstract
Background: Laparoscopic Roux-en-Y gastric bypass (LRYGB) has been established as a leading treatment of obesity. Surgical site infections (SSIs) remain the most common complication., Objective: To compare the incidence of SSIs before and after the implementation of our technique., Methods: Our intraoperative technique limits enteric contact with the abdominal wall through a wound protector at the end-to-end anastomosis stapler port site, with enteric retrieval with a specimen bag followed by betadine irrigation. We analyzed our SSIs outcomes before and after implementation of our technique in all RYGB and laparoscopic sleeve-to-bypass conversions at our institution performed by two providers between January 1, 2009 to December 31, 2011 and January 1, 2019 to December 31, 2021. We compared patient age, sex, body mass index, American Society of Anesthesiologists class; and comorbidities including hypertension, diabetes, and hyperlipidemia. The χ
2 , Fischer exact, Wilcoxon Rank Sum tests, and multivariate analysis were performed., Results: Four hundred twenty-nine patients underwent LRYGB and sleeve-to-bypass conversion during the two study periods. Group 1 (162 patients, 37.76%) all underwent RYGB. Group 2 (267 patients, 62.24%) of whom 199 underwent RYGB and 68 underwent a laparoscopic sleeve-to-bypass conversion. The SSI rate was 9.26% in Group 1 and 2.62% in Group 2 (p = 0.002514). Statistical significance was also noted for operating room time (137 min vs 123 min, p = 0.02) and hospital length of stay (2 - 3 interquartile range vs 1 - 2 interquartile range, p = 0.04)., Conclusion: We propose a safe, reproducible technique that significantly reduces SSI rates during LRYGB., (© 2022 by SLS, Society of Laparoscopic & Robotic Surgeons.)- Published
- 2022
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12. Safety and efficacy of roux-en-y gastric bypass in older aged patients.
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Quintero JHR, Grosser R, Velez GR, Ramos-Santillan VO, Pereira X, Flores FM, Choi J, Moran-Atkin E, Camacho D, and Lima DL
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- Aged, Gastrectomy, Humans, Middle Aged, Retrospective Studies, Treatment Outcome, Weight Loss, Bariatric Surgery, Gastric Bypass adverse effects, Laparoscopy adverse effects, Obesity, Morbid surgery
- Abstract
Introduction: laparoscopic Roux-en-Y Gastric Bypass (LRYGB) has been a revolutionary intervention for weight loss with reduction of up to 60-70% of excess body weight. However, these outcomes are not as well validated at the extremes of age, where the safety of the intervention still has some caveats. The aim of this study is to assess the efficacy and safety of primary LRYGB among different age groups., Methods: the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program (MBSAQIP) database was queried for patients who underwent primary LRYGB from January 2014 to December 2017 at a single institution. Four groups were created and compared by dividing our sample by age quartiles. The primary outcome was percent excess weight loss (%EWL) at 1 year. Additional operative outcomes and complications were also compared across groups., Results: a total of 1013 patients underwent non-revisional LRYGB during the study period. Mean %EWL at one year was 55%. When compared between quartiles, there was a statistically significant difference in %EWL: 1st 62%, 2nd 57%, 3rd 54% and 4th 47% (p=0.010). The differences in the secondary outcomes between age groups did not demonstrate statistical significance., Conclusions: though patients in the fourth age quartile (range) did not demonstrate a statistically significant increase in adverse outcomes, they did lose less weight compared to other cohorts. The %EWL at one year after RYGB varied by age in our cohort. Goals after bariatric surgery should be individualized as weight loss is less robust with aging.
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- 2022
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13. VERSATILITY OF POLY-4-HYDROXYBUTYRATE (PHASIX™) MESH IN ABDOMINAL WALL SURGERY.
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Lima DL, Estrada A, Pereira X, Alcabes A, Sreeramoju P, and Malcher F
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- Adolescent, Adult, Aged, Aged, 80 and over, Child, Escherichia coli, Humans, Hydroxybutyrates, Middle Aged, Polymers, Recurrence, Retrospective Studies, Surgical Mesh, Treatment Outcome, Young Adult, Abdominal Wall surgery, Hernia, Ventral surgery
- Abstract
Background: Poly-4-hydroxybutyrate (P4HB) is a naturally occurring polymer derived from transgenic E. coli bacteria with the longest degradation rate when compared to other available products. This polymer has been manufactured as a biosynthetic mesh to be used as reinforcement when repairing a variety of abdominal wall defects., Objective: We aim to describe our center initial experience with this mesh and discuss the possible indications that may benefit from the use of P4HB mesh., Methods: This is a descriptive retrospective study of patients who underwent abdominal wall repair with a P4HB mesh from October 2018 to December 2020 in a single, large volume, academic center., Results: A total of 51 patients (mean age 54.4 years, range 12-89) underwent abdominal wall reconstruction with a P4HB mesh between October 2018 and December 2020. The mean BMI was 30.5 (range 17.2-50.6). Twenty-three (45%) patients had a prior hernia repair at the site. We grouped patients into six different indications for the use of P4HB mesh in our cohort: clean-contaminated, contaminated or infected field (57%), patient refusal for permanent meshes (14%), those with high risk for post-operative infection (12%), visceral protection of second mesh (10%), recurrence with related chronic pain from mesh (6%), and children (2%). Median follow-up was 105 days (range 8-648). Two patients had hernia recurrence (4%) and 8 (16%) patients developed seroma., Conclusion: P4HB mesh is a safe and a viable alternative for complex hernias and high-risk patients with a low complication rate in the short-term.
- Published
- 2022
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14. Preoperative botulinum A toxin as an adjunct for abdominal wall reconstruction: a single-center early experience at an Academic Center in New York.
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Mandujano CC, Lima DL, Alcabes A, Friedmann P, Pereira X, and Malcher F
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- Abdominal Muscles surgery, Adult, Aged, Aged, 80 and over, Hernia, Ventral surgery, Herniorrhaphy, Humans, Middle Aged, New York, Preoperative Care, Abdominal Wall surgery, Botulinum Toxins, Type A therapeutic use, Neuromuscular Agents therapeutic use
- Abstract
Introduction: the botulinum toxin A (BTA) has been used to achieve a chemical component separation, and it has been used with favorable outcomes for the repair of complex ventral hernia (CVH) with and without loss of domain (LD). The aim of this study is to describe our early experience with the chemical component separation in the United Sates., Methods: a retrospective observational study of all patients who underwent ventral hernia repair for CVH with or without LD between July 2018 and June 2020. Preoperative BTA was injected in all patients via sonographic guidance bilaterally, between the lateral muscles to achieve chemical denervation before the operation. Patient demographics, anatomical location of the hernia, perioperative data and postoperative data are described., Results: 36 patients underwent this technique before their hernia repair between July 2018 to June 2020. Median age was 62 years (range 30-87). Median preoperative defect size was 12cm (range 6-25) and median intraoperative defect size was 13cm (range 5-27). Median preoperative hernia sac volume (HSV) was 1338cc (128-14040), median preoperative abdominal cavity volume (ACV) was 8784cc (5197-18289) and median volume ration (HSV/ACV) was 14%. The median OR time for BTA administration was 45 minutes (range 28-495). Seroma was the most common postoperative complication in 8 of the patients (22%). Median follow up was 43 days (range 0-580)., Conclusion: preoperative chemical component separation with BTA is a safe and effective adjunct to hernia repair in CVH repairs where a challenging midline fascial approximation is anticipated.
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- 2022
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15. ROBOTIC TRANS-ABDOMINAL PREPERITONEAL APPROACH (TAPP) APPROACH FOR LATERAL INCISIONAL HERNIAS.
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Cabrera ATG, Lima DL, Pereira X, Cavazzola LT, and Malcher F
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- Herniorrhaphy, Humans, Retrospective Studies, Surgical Mesh, Hernia, Ventral surgery, Incisional Hernia surgery, Laparoscopy
- Abstract
Background: Lateral incisional hernias arise between the linea alba and the posterior paraspinal muscles. Anatomical boundaries contain various topographic variations, such as multiple nearby bony structures and paucity of aponeurotic tissue that make it particularly challenging to repair., Aim: To describe a robotic assisted surgical technique for incisional lumbar hernia repair., Methods: Retrospective data was collected from four patients who underwent robotic-assisted repair of their lumbar hernias after open nephrectomies., Results: Age ranged from 41-53 y. Two patients had right sided flank hernias while the other two on the left. One patient had a recurrent hernia on the left side. The patients were placed in lateral decubitus position contralateral to the hernia defect side. A trans-abdominal preperitoneal approach was used in all cases. Each case was accomplished with two 8 mm robotic ports, a 12 mm periumbilical port, and a 5 mm assistance port that allowed docking on the ipsilateral hernia side. The hernias were identified, a preperitoneal plane was created, and the hernia sac completely dissected allowing for complete visualization of the defect. All defects were primarily closed. Polypropylene or ProGripTM mesh was applied with at least 5 cm overlap and secured using either #0 Vicryl® transfacial sutures, Evicel® or a combination of both. The peritoneal space was closed with running suture and the ports were removed and closed. The average surgical length was 4 hr. The post-operative length of stay ranged from 0-2 days., Conclusion: The robotics platform may provide unique advantages in the repair of lateral incisional hernias and represents a safe, feasible and effective minimally invasive approach for the correction of lateral incisional hernias.
- Published
- 2021
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16. Cecal bascule - A rare cause of cecal volvulus after cesarean section.
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Bakshi C, Pereira X, Massad N, Lima DL, Peskin-Stolze M, and Malcher F
- Abstract
Introduction and Importance: Cecal bascule is a rare form of a cecal volvulus characterized by an anterior and superiorly displaced cecum in turn causing compression of the ascending colon that can result in a large bowel obstruction. We report a case of cecal bascule in a newly postpartum patient, with emphasis on clinical presentation, radiologic findings and treatment., Case Presentation: A 37-year-old female who underwent an uncomplicated c-section and bilateral salpingectomy developed severe abdominal pain, vomiting, and peritonitis 12 h after surgery. A computerized tomography of the abdomen and pelvis revealed a dilated and superiorly displaced cecum. The diagnosis of cecal bascule was confirmed intraoperatively and a right hemicolectomy was performed. The patient recovered appropriately and was discharged on postoperative day six., Discussion: Cecal bascule is the rarest form of cecal volvulus. In the context of obstetrics and gynecology, it has mostly been mentioned perioperatively after cesarean, but was also reported in an antepartum patient. It usually occurs in patients with redundant or mobile cecum, which is a result of incomplete fixation of the cecum to the retroperitoneum during embryogenesis. Other risk factors include recent surgery, previous abdominal surgery, ileus, chronic constipation, and distal colonic obstruction. An association has also been shown with pregnancy or the postpartum abdomen and is hypothesized to be due to mass effect., Conclusion: Cecal bascule is a serious entity requiring a high index of suspicion and warranting greater awareness in the post-natal patient. Clinical diagnosis, prompt imaging, and surgery are important to avoid bowel ischemia and perforation., (Copyright © 2021 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2021
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17. Neuroendocrine Tumor of the Common Bile Duct Associated With von Hippel-Lindau Disease.
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Romero-Velez G, Pereira X, Yang J, Panarelli NC, and McAuliffe JC
- Abstract
We report a case of a common bile duct neuroendocrine tumor discovered in a patient with von Hippel-Lindau disease to emphasize the importance of recognizing this unusual diagnosis. This case illustrates the importance of endoscopic evaluation and the potential diagnostic pitfalls which may impact its appropriate management: the anatomic proximity of more common von Hippel-Lindau disease-related tumors, pathologic evaluation, and staging. Therefore, awareness of this rare diagnosis is important for appropriate treatment., (© 2021 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of The American College of Gastroenterology.)
- Published
- 2021
- Full Text
- View/download PDF
18. Traumatic Brown-Séquard syndrome: modern reminder of a neurological injury.
- Author
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Rodríguez-Quintero JH, Romero-Velez G, Pereira X, and Kim PK
- Subjects
- Adult, Brown-Sequard Syndrome diagnosis, Diagnosis, Differential, Humans, Magnetic Resonance Imaging, Male, Spinal Cord Injuries diagnostic imaging, Tomography, X-Ray Computed, Wounds, Stab diagnostic imaging, Brown-Sequard Syndrome etiology, Spinal Cord Injuries complications, Wounds, Stab complications
- Abstract
Brown-Séquard syndrome (BSS) presents as an ipsilateral loss of motor function, proprioception and vibratory sensation accompanied by contralateral pain and temperature loss two to three levels below the level of the injury. It is one of the syndromes associated with incomplete transection of the spinal cord. Classic BSS is rare as most patients present with mixed neurological deficits related to damage of the spinal cord and surrounding structures. BSS remains prevalent in areas with high trauma burden, where assaults with sharp weapons are common. We present the case of a man aged 38 years who sustained a stab injury to the left back. BSS was diagnosed. He underwent removal of the weapon in the operating room and had an uneventful recovery to near baseline functional level after a course of rehabilitation. Despite being a rare aetiology, BSS continues to be an excellent reminder to trauma providers of the anatomy and physiology of neuroanatomical tracts., Competing Interests: Competing interests: None declared., (© BMJ Publishing Group Limited 2020. No commercial re-use. See rights and permissions. Published by BMJ.)
- Published
- 2020
- Full Text
- View/download PDF
19. A Rare Case of Intestinal Obstruction Secondary to Amyloidosis.
- Author
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Lee SY, Romero-Velez G, Dickinson G, and Pereira X
- Published
- 2020
- Full Text
- View/download PDF
20. Where have the surgical patients gone during the COVID-19 pandemic?
- Author
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Pereira X, Lima DL, Moran-Atkin E, and Malcher F
- Subjects
- Humans, SARS-CoV-2, COVID-19, Pandemics, Quarantine, Surgical Procedures, Operative trends
- Abstract
A Commentary on Emergency Surgery at the Epicenter of the COVID-19 Pandemic.
- Published
- 2020
- Full Text
- View/download PDF
21. Prevalence and factors associated with burnout among university professors.
- Author
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de Araújo Leite TI, Costa Fernandes JP, da Costa Araújo FL, de Brito Fernandes Pereira X, de Azevedo DM, and Souza Lucena EE
- Abstract
Background: Burnout is one of the main examples of health disorders directly related to work. This is a psychological syndrome that results from exposure to stressors in the workplace and represents a considerable psychosocial problem., Objective: To establish the prevalence of and factors associated with burnout among professors at public and private universities., Methods: We administered two self-report questionnaires-one for sociodemographic, psychosocial, occupational and health-related data, and the other based on the Maslach Burnout Inventory-Educators Survey-to professors at four public and private universities in Caicó, Rio Grande do Norte, Brazil. We subjected the data to univariate and bivariate analysis and also fitted a logistic regression model., Results: About 60% of the participants were categorized as in the earliest stage of burnout syndrome. Having a chronic disease and teaching a large number of courses were the only variables significantly associated with burnout. The average score on domain depersonalization was significantly higher among the participants who had a second job, those who reported to need professional updating and the ones who taught a large number of courses. The average score on domain emotional exhaustion was higher among the participants with some chronic disease and those with high blood pressure., Conclusion: The prevalence of burnout was high in the analyzed sample of university professors. Early detection of burnout symptoms might favor early treatment.
- Published
- 2020
- Full Text
- View/download PDF
22. Gemella morbillorum as a source bacteria for necrotising fasciitis of the torso.
- Author
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Romero-Velez G, Pereira X, Narula A, and Kim PK
- Subjects
- Administration, Intravenous, Aged, Debridement, Diagnosis, Differential, Fasciitis, Necrotizing microbiology, Gram-Positive Bacterial Infections microbiology, Humans, Male, Anti-Bacterial Agents therapeutic use, Fasciitis, Necrotizing drug therapy, Gemella isolation & purification, Gram-Positive Bacterial Infections drug therapy, Torso microbiology
- Abstract
A 66-year-old man presented with upper back cellulitis and imaging findings consistent with a necrotising soft tissue infection. He was started on broad-spectrum intravenous antibiotics and was taken to the operating room for immediate surgical debridement. On postoperative day 5, the culture was noted to be growing Gemella morbillorum, an exceedingly rare cause of necrotising soft tissue infections in immunocompetent hosts. His condition improved, and he was transitioned to oral antibiotics and discharged home., Competing Interests: Competing interests: None declared., (© BMJ Publishing Group Limited 2020. No commercial re-use. See rights and permissions. Published by BMJ.)
- Published
- 2020
- Full Text
- View/download PDF
23. Endoscopic Diagnosis of Early Acute Appendicitis in an Asymptomatic Patient.
- Author
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Pereira X, Romero-Velez G, Dickinson G, and Mandujano CC
- Published
- 2020
- Full Text
- View/download PDF
24. Depression in primary care, part 1: screening and diagnosis.
- Author
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Zainab A and Pereira X
- Abstract
One of the commonest psychological problems that a clinician would encounter in primary care is depression. The prevalence of depression is high in women, the elderly and those with underlying physical problems or during the postpartum period. The spectrum of clinical presentations is wide and somatic complaints are more common in primary care clinics. Depression may present as a primary disorder and co-morbidity with other psychological problems or physical illnesses is high. A good clinical interview is an important form of assessment and a quick screening of depression can be done with the administration of proper rating scales, such as the Patient Health Questionnaire, Hamilton Depression Rating Scale or Geriatric Depression Scale. Repeated use of the same scale in a patient would help the clinician to monitor the progress objectively.
- Published
- 2007
25. Depression in primary care part 2: management.
- Author
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Pereira X and Zainab A
- Abstract
The management of depression in the primary care setting should ideally take a biological, psychological, and sociological approach. Antidepressants are the most commonly used biological agents in the treatment of depression. Psychological therapies and psychosocial interventions improve the outcome of treatment when combined with pharmacotherapy. Clinical depression is treatable and thus efforts should be made to alleviate the suffering of patients with depression.
- Published
- 2007
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