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Verdugo-Paiva F, Vergara C, Ávila C, Castro J, Cid J, Contreras V, Jara I, Jiménez V, Lee MH, Muñoz M, Rojas-Gómez AM, Rosón-Rodríguez P, Serrano-Arévalo K, Silva-Ruz I, Vásquez-Laval J, Zambrano-Achig P, Zavadzki G, Rada G. COVID-19 L·OVE repository is highly comprehensive and can be used as a single source for COVID-19 studies. J Clin Epidemiol 2022; 149:195-202. [PMID: 35597369 PMCID: PMC9116966 DOI: 10.1016/j.jclinepi.2022.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 04/05/2022] [Accepted: 05/04/2022] [Indexed: 11/15/2022]
Abstract
Background and Objective The coronavirus disease 2019 Living OVerview of Evidence (COVID-19 L·OVE) is a public repository and classification platform for COVID-19 articles. The repository contains more than 430,000 articles as of September 20, 2021 and intends to provide a one-stop shop for COVID-19 evidence. Considering that systematic reviews conduct high-quality searches, this study assesses the comprehensiveness and currency of the repository against the total number of studies in a representative sample of COVID-19 systematic reviews. Methods Our sample was generated from all the studies included in the systematic reviews of COVID-19 published during April 2021. We estimated the comprehensiveness of COVID-19 L·OVE repository by determining how many of the individual studies in the sample were included in the COVID-19 L·OVE repository. We estimated the currency as the percentage of studies that was available in the COVID-19 L·OVE repository at the time the systematic reviews conducted their own search. Results We identified 83 eligible systematic reviews that included 2,132 studies. COVID-19 L·OVE had an overall comprehensiveness of 99.67% (2,125/2,132). The overall currency of the repository, that is, the proportion of articles that would have been obtained if the search of the reviews was conducted in COVID-19 L·OVE instead of searching the original sources, was 96.48% (2,057/2,132). Both the comprehensiveness and the currency were 100% for randomized trials (82/82). Conclusion The COVID-19 L·OVE repository is highly comprehensive and current. Using this repository instead of traditional manual searches in multiple databases can save a great amount of work to people conducting systematic reviews and would improve the comprehensiveness and timeliness of evidence syntheses. This tool is particularly important for supporting living evidence synthesis processes.
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Affiliation(s)
| | - C Vergara
- Epistemonikos Foundation, Santiago, Chile
| | - C Ávila
- Epistemonikos Foundation, Santiago, Chile
| | - J Castro
- Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - J Cid
- School of Dentistry, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | - I Jara
- Epistemonikos Foundation, Santiago, Chile
| | - V Jiménez
- Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - M H Lee
- Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - M Muñoz
- Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - A M Rojas-Gómez
- Epistemonikos Foundation, Santiago, Chile; Unidad de investigación en medicina estomatológica preventiva y social (UIMEPS), Universidad del Magdalena, Santa Marta, Colombia
| | | | | | - I Silva-Ruz
- School of Dentistry, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | | | - G Zavadzki
- School of Medicine, Federal University of São Paulo, São Paulo, Brazil
| | - G Rada
- Epistemonikos Foundation, Santiago, Chile; UC Evidence Center, Cochrane Chile Associated Center, Pontificia Universidad Católica de Chile, Santiago, Chile; Internal Medicine Department, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
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Maisonnasse P, Aldon Y, Marc A, Marlin R, Dereuddre-Bosquet N, Kuzmina NA, Freyn AW, Snitselaar JL, Gonçalves A, Caniels TG, Burger JA, Poniman M, Chesnais V, Diry S, Iershov A, Ronk AJ, Jangra S, Rathnasinghe R, Brouwer P, Bijl T, van Schooten J, Brinkkemper M, Liu H, Yuan M, Mire CE, van Breemen MJ, Contreras V, Naninck T, Lemaître J, Kahlaoui N, Relouzat F, Chapon C, Ho Tsong Fang R, McDanal C, Osei-Twum M, St-Amant N, Gagnon L, Montefiori DC, Wilson IA, Ginoux E, de Bree GJ, García-Sastre A, Schotsaert M, Coughlan L, Bukreyev A, van der Werf S, Guedj J, Sanders RW, van Gils MJ, Le Grand R. COVA1-18 neutralizing antibody protects against SARS-CoV-2 in three preclinical models. Res Sq 2021:rs.3.rs-235272. [PMID: 33619476 PMCID: PMC7899470 DOI: 10.21203/rs.3.rs-235272/v1] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
One year into the Coronavirus Disease 2019 (COVID-19) pandemic caused by Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2), effective treatments are still needed 1-3 . Monoclonal antibodies, given alone or as part of a therapeutic cocktail, have shown promising results in patients, raising the hope that they could play an important role in preventing clinical deterioration in severely ill or in exposed, high risk individuals 4-6 . Here, we evaluated the prophylactic and therapeutic effect of COVA1-18 in vivo , a neutralizing antibody isolated from a convalescent patient 7 and highly potent against the B.1.1.7. isolate 8,9 . In both prophylactic and therapeutic settings, SARS-CoV-2 remained undetectable in the lungs of COVA1-18 treated hACE2 mice. Therapeutic treatment also caused a dramatic reduction in viral loads in the lungs of Syrian hamsters. When administered at 10 mg kg - 1 one day prior to a high dose SARS-CoV-2 challenge in cynomolgus macaques, COVA1-18 had a very strong antiviral activity in the upper respiratory compartments with an estimated reduction in viral infectivity of more than 95%, and prevented lymphopenia and extensive lung lesions. Modelling and experimental findings demonstrate that COVA1-18 has a strong antiviral activity in three different preclinical models and could be a valuable candidate for further clinical evaluation.
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Affiliation(s)
- P Maisonnasse
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
| | - Y Aldon
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - A Marc
- Université de Paris, INSERM, IAME, F-75018 Paris, France
| | - R Marlin
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
| | - N Dereuddre-Bosquet
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
| | - N A Kuzmina
- Department of Pathology, University of Texas Medical Branch at Galveston, Texas, USA
- Galveston National Laboratory, Texas, USA
| | - A W Freyn
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York (NY), USA
| | - J L Snitselaar
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - A Gonçalves
- Université de Paris, INSERM, IAME, F-75018 Paris, France
| | - T G Caniels
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - J A Burger
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - M Poniman
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - V Chesnais
- Life and Soft, 92350 Le Plessis-Robinson, France
| | - S Diry
- Life and Soft, 92350 Le Plessis-Robinson, France
| | - A Iershov
- Life and Soft, 92350 Le Plessis-Robinson, France
| | - A J Ronk
- Department of Pathology, University of Texas Medical Branch at Galveston, Texas, USA
- Galveston National Laboratory, Texas, USA
| | - S Jangra
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York (NY), USA
| | - R Rathnasinghe
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York (NY), USA
- Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York (NY), USA
| | - Pjm Brouwer
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - Tpl Bijl
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - J van Schooten
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - M Brinkkemper
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - H Liu
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - M Yuan
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - C E Mire
- Galveston National Laboratory, Texas, USA
- Department of Microbiology, University of Texas Medical Branch at Galveston, Texas, USA
| | - M J van Breemen
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - V Contreras
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
| | - T Naninck
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
| | - J Lemaître
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
| | - N Kahlaoui
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
| | - F Relouzat
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
| | - C Chapon
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
| | - R Ho Tsong Fang
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
| | - C McDanal
- Duke Human Vaccine Institute & Department of Surgery, Durham, NC 27710, USA
| | | | | | | | - D C Montefiori
- Duke Human Vaccine Institute & Department of Surgery, Durham, NC 27710, USA
| | - I A Wilson
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - E Ginoux
- Life and Soft, 92350 Le Plessis-Robinson, France
| | - G J de Bree
- Internal Medicine of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - A García-Sastre
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York (NY), USA
- Department of Medicine, Division of Infectious Diseases, Icahn School of Medicine at Mount Sinai, New York (NY), USA
- The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York (NY), USA
- Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York (NY), USA
| | - M Schotsaert
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York (NY), USA
- Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York (NY), USA
| | - L Coughlan
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York (NY), USA
- University of Maryland School of Medicine, Department of Microbiology and Immunology and Center for Vaccine Development and Global Health (CVD), 685 W. Baltimore Street, HSF1, Office #380E, Baltimore, MD 21201
| | - A Bukreyev
- Department of Pathology, University of Texas Medical Branch at Galveston, Texas, USA
- Galveston National Laboratory, Texas, USA
- Department of Microbiology, University of Texas Medical Branch at Galveston, Texas, USA
| | - S van der Werf
- Molecular Genetics of RNA Viruses, Department of Virology, Institut Pasteur, CNRS UMR 3569, Université de Paris, Paris, France
- National Reference Center for Respiratory Viruses, Institut Pasteur, Paris, France
| | - J Guedj
- Université de Paris, INSERM, IAME, F-75018 Paris, France
| | - R W Sanders
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
- Department of Microbiology and Immunology, Weill Medical College of Cornell University, New York, NY 10021, USA
| | - M J van Gils
- Departments of Medical Microbiology of the Amsterdam UMC, University of Amsterdam, Amsterdam Institute for Infection and Immunity, 1105 AZ, Amsterdam, The Netherlands
| | - R Le Grand
- Université Paris-Saclay, Inserm, CEA, Center for Immunology of Viral, Auto-immune, Hematological and Bacterial diseases (IMVA-HB/IDMIT), Fontenay-aux-Roses & Le Kremlin-Bicêtre, Paris, France
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3
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De Damas Medina M, Prior I, Moreno M, Contreras V, Arraiza C, Martínez M. Gastrostomy tube insertion techniques: our experience from “complejo hospitalario de jaÉn”. Clin Nutr ESPEN 2020. [DOI: 10.1016/j.clnesp.2020.09.518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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Sepúlveda P, Cortinez LI, Irani M, Egaña JI, Contreras V, Sánchez Corzo A, Acosta I, Sitaram R. Differential frontal alpha oscillations and mechanisms underlying loss of consciousness: a comparison between slow and fast propofol infusion rates. Anaesthesia 2019; 75:196-201. [PMID: 31788791 DOI: 10.1111/anae.14885] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/16/2019] [Indexed: 12/19/2022]
Abstract
Mechanisms underlying loss of consciousness following propofol administration remain incompletely understood. The objective of this study was to compare frontal lobe electroencephalography activity and brainstem reflexes during intravenous induction of general anaesthesia, in patients receiving a typical bolus dose (fast infusion) of propofol compared with a slower infusion rate. We sought to determine whether brainstem suppression ('bottom-up') predominates over loss of cortical function ('top-down'). Sixteen ASA physical status-1 patients were randomly assigned to either a fast or slow propofol infusion group. Loss of consciousness and brainstem reflexes were assessed every 30 s by a neurologist blinded to treatment allocation. We performed a multitaper spectral analysis of all electroencephalography data obtained from each participant. Brainstem reflexes were present in all eight patients in the slow infusion group, while being absent in all patients in the fast infusion group, at the moment of loss of consciousness (p = 0.010). An increase in alpha band power was observed before loss of consciousness only in participants allocated to the slow infusion group. Alpha band power emerged several minutes after the loss of consciousness in participants allocated to the fast infusion group. Our results show a predominance of 'bottom-up' mechanisms during fast infusion rates and 'top-down' mechanisms during slow infusion rates. The underlying mechanisms by which propofol induces loss of consciousness are potentially influenced by the speed of infusion.
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Affiliation(s)
- P Sepúlveda
- Department of Anaesthesiology, Clínica Alemana - UDD, Santiago de Chile
| | - L I Cortinez
- Department of Anaesthesia, School of Medicine, Pontificia Universidad Católica Santiago de Chile
| | - M Irani
- Department of Psychiatry and Division of Neuroscience, Pontificia Universidad Católica Santiago de Chile
| | - J I Egaña
- Department of Anaesthesiology and Peri-operative Medicine, Faculty of Medicine, Universidad de Chile
| | - V Contreras
- Department of Adult and Aging Health, School of Nursing, Pontificia Universidad Católica Santiago de Chile
| | - A Sánchez Corzo
- Department of Psychiatry and Division of Neuroscience, Pontificia Universidad Católica Santiago de Chile
| | - I Acosta
- Department of Neurology, Clínica Alemana Santiago de Chile
| | - R Sitaram
- Department of Psychiatry and Division of Neuroscience, Pontificia Universidad Católica Santiago de Chile.,Institute for Biological and Medical Engineering, Pontificia Universidad Católica Santiago de Chile.,Center for Brain-Machine Interfaces and Neuromodulation, Pontificia Universidad Católica Santiago de Chile
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5
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Gaytán L, Rascón CR, Angel-García O, Véliz FG, Contreras V, Mellado M. Factors influencing English Bulldog bitch fertility after surgical uterine deposition of fresh semen. Theriogenology 2019; 142:315-319. [PMID: 31711693 DOI: 10.1016/j.theriogenology.2019.10.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 07/30/2019] [Accepted: 10/15/2019] [Indexed: 11/17/2022]
Abstract
The aim of this study was to evaluate the effect of body weight, oxytocin deposition in the uterus at artificial insemination (AI), vaginal cytology, serum progesterone (P4) concentration at AI, semen volume and total sperm cells per AI on whelping rate and litter size of English Bulldogs bitches following intrauterine surgical semen deposition. Seventy-eight English Bulldog bitches were artificially inseminated via semen infusion (number of sperm cells inseminated 300-2500 × 106) at the uterine body with fresh semen without extender and under general anesthesia. Whelping rate was greater (P < 0.05) in bitches with >23 kg than bitches with <23 kg (83.9 vs 63.8%). Whelping rate was greater (P < 0.01) in bitches with >75% vaginal cornified epithelium at AI (85.1%) than animals with <75% cornified epithelium (51.6%). Whelping rates were influenced (P < 0.01) by the semen volume at AI (54.3% vs 86.1% for bitches receiving <4 mL or >4 mL of semen). Litter size was larger (P < 0.05) in bitches >23 kg than lighter animals (3.72 ± 1.79 and 2.30 ± 1.46 pups per litter, respectively). Litter size was not influenced by sperm concentration, semen volume, vaginal cytology, serum P4 concentration and infusion of oxytocin in the uterus at AI (P > 0.1). The results of this study indicate that increasing body weight of English Bulldog bitches is related to higher whelping rates and larger litter size. Also, >75% of superficial cornified vaginal cells (squamous) at AI and >4 mL semen volume maximize whelping rates in this breed of dogs.
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Affiliation(s)
- L Gaytán
- Autonomous Agrarian University Antonio Narro, Department of Veterinary Science, Torreon, 27056, Mexico
| | - C R Rascón
- Autonomous Agrarian University Antonio Narro, Department of Veterinary Science, Torreon, 27056, Mexico
| | - O Angel-García
- Autonomous Agrarian University Antonio Narro, Department of Veterinary Science, Torreon, 27056, Mexico
| | - F G Véliz
- Autonomous Agrarian University Antonio Narro, Department of Veterinary Science, Torreon, 27056, Mexico
| | - V Contreras
- Autonomous Agrarian University Antonio Narro, Department of Veterinary Science, Torreon, 27056, Mexico
| | - M Mellado
- Autonomous Agrarian University Antonio Narro, Department of Animal Nutrition, Saltillo, 25315, Mexico.
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Urquiza–Haas T, Tobón W, Kolb M, Lira–Noriega A, Contreras V, Alarcón J, Koleff P. Assessing best practice for selecting surrogates and target–setting methods in a megadiverse country. Anim Biodiv Conserv 2019. [DOI: 10.32800/abc.2019.42.0187] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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7
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De Santiago-Miramontes A, Cruz E, Luna X, Contreras V, Angel O, Véliz-Deras F. PSXV-7 Static effect of nutrition on the sexual performance of creole male goats in northern Mexico. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.1046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - E Cruz
- Universidad Autonoma Agraria Antonio Narro,Saltillo, Mexico
| | - X Luna
- Universidad Autonoma Agraria Antonio Narro,Saltillo, Mexico
| | - V Contreras
- Universidad Autonoma Agraria Antonio Narro,Saltillo, Mexico
| | - O Angel
- Universidad Autonoma Agraria Antonio Narro,Saltillo, Mexico
| | - F Véliz-Deras
- Universidad Autonoma Agraria Antonio Narro,Saltillo, Mexico
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De Santiago-Miramontes A, Luna X, Cruz E, Contreras V, Ángel O, Véliz-Deras F. PSXV-8 Nutritional supplementation + testosterone treatment, increases, body weight, sexual odor, scrotal circumference and libido in male goats during sexual resting. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.1047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | - X Luna
- Universidad Autonoma Agraria Antonio Narro,Saltillo, Mexico
| | - E Cruz
- Universidad Autonoma Agraria Antonio Narro,Saltillo, Mexico
| | - V Contreras
- Universidad Autonoma Agraria Antonio Narro,Saltillo, Mexico
| | - O Ángel
- Universidad Autónoma Agraria Antonio Narro, Torreón,Mexico
| | - F Véliz-Deras
- Universidad Autonoma Agraria Antonio Narro,Saltillo, Mexico
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Sanchez-Torralvo F, Contreras V, Gonzalez-Almendros I, Ruiz-Vico M, Abuin-Fernandez J, Cantero-Gonzalez A, Garin J, Olveira G. Subjective global assessment against other anthropometric and functional parameters as predictor of hospital length of stay and mortality in oncologic patients. Clin Nutr 2018. [DOI: 10.1016/j.clnu.2018.06.1325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Bracesco N, Sosa V, Blanc L, Contreras V, Candreva EC, Salvo VA, Hocart S, Mechoso B, Nunes E. Analysis of radioprotection and antimutagenic effects of Ilex paraguariensis infusion and its component rutin. ACTA ACUST UNITED AC 2018; 51:e7404. [PMID: 30020319 PMCID: PMC6050948 DOI: 10.1590/1414-431x20187404] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Accepted: 05/23/2018] [Indexed: 02/08/2023]
Abstract
DNA repair pathways, cell cycle checkpoints, and redox protection systems are essential factors for securing genomic stability. The aim of the present study was to analyze the effect of Ilex paraguariensis (Ip) infusion and one of its polyphenolic components rutin on cellular and molecular damage induced by ionizing radiation. Ip is a beverage drank by most inhabitants of Argentina, Paraguay, Southern Brazil, and Uruguay. The yeast Saccharomyces cerevisiae (SC7Klys 2-3) was used as the eukaryotic model. Exponentially growing cells were exposed to gamma rays (γ) in the presence or absence of Ip or rutin. The concentrations used simulated those found in the habitual infusion. Surviving fractions, mutation frequency, and DNA double-strand breaks (DSB) were determined after treatments. A significant increase in surviving fractions after gamma irradiation was observed following combined exposure to γ+R, or γ+Ip. Upon these concomitant treatments, mutation and DSB frequency decreased significantly. In the mutant strain deficient in MEC1, a significant increase in γ sensitivity and a low effect of rutin on γ-induced chromosomal fragmentation was observed. Results were interpreted in the framework of a model of interaction between radiation-induced free radicals, DNA repair pathways, and checkpoint controls, where the DNA damage that induced activation of MEC1 nodal point of the network could be modulated by Ip components including rutin. Furthermore, ionizing radiation-induced redox cascades can be interrupted by rutin potential and other protectors contained in Ip.
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Affiliation(s)
- N Bracesco
- Radiobiology Laboratory, Department of Biophysics, Faculty of Medicine, University of the Republic, Montevideo, Uruguay
| | - V Sosa
- Radiobiology Laboratory, Department of Biophysics, Faculty of Medicine, University of the Republic, Montevideo, Uruguay
| | - L Blanc
- Radiobiology Laboratory, Department of Biophysics, Faculty of Medicine, University of the Republic, Montevideo, Uruguay
| | - V Contreras
- Radiobiology Laboratory, Department of Biophysics, Faculty of Medicine, University of the Republic, Montevideo, Uruguay
| | - E C Candreva
- Radiobiology Laboratory, Department of Biophysics, Faculty of Medicine, University of the Republic, Montevideo, Uruguay
| | - V A Salvo
- Cancer Research Laboratory, Ponce School of Medicine Health Sciences, Ponce, Puerto Rico.,Cardiovascular Research Laboratory, Ponce School of Medicine Health Sciences, Ponce, Puerto Rico
| | - S Hocart
- Peptide Research, Department of Medicine, Tulane University, New Orleans, LA, USA
| | - B Mechoso
- Radiobiology Laboratory, Department of Biophysics, Faculty of Medicine, University of the Republic, Montevideo, Uruguay
| | - E Nunes
- Radiobiology Laboratory, Department of Biophysics, Faculty of Medicine, University of the Republic, Montevideo, Uruguay
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Rolle A, Paredes S, Cortínez LI, Anderson BJ, Quezada N, Solari S, Allende F, Torres J, Cabrera D, Contreras V, Carmona J, Ramírez C, Oliveros AM, Ibacache M. Dexmedetomidine metabolic clearance is not affected by fat mass in obese patients. Br J Anaesth 2018; 120:969-977. [PMID: 29661414 DOI: 10.1016/j.bja.2018.01.040] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 12/28/2017] [Accepted: 01/27/2018] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Obesity has been associated with reduced dexmedetomidine clearance, suggesting impaired hepatic function or reduced hepatic blood flow. The aim of this study was to clarify the effect of obesity in dexmedetomidine metabolic clearance. METHODS Forty patients, ASA I-III, 18-60 yr old, weighing 47-126 kg, scheduled for abdominal laparoscopic surgery, were enrolled. Anaesthetic agents (propofol, remifentanil, and dexmedetomidine) were dosed based on lean body weight measured by dual X-ray absorptiometry. Serial venous samples were drawn during and after dexmedetomidine infusion. A pharmacokinetic analysis was undertaken using non-linear mixed-effect models. In the modelling approach, the total body weight, lean body weight, and adjusted body weight were first tested as size descriptors for volumes and clearances. Hepatic blood flow, liver histopathology, liver enzymes, and gene expression of metabolic enzymes (UGT2B10 and UGT1A4) were tested as covariates of dexmedetomidine metabolic clearance. A decrease in NONMEM objective function value (ΔOFV) of 3.84 points, for an added parameter, was considered significant at the 0.05 level. RESULTS A total of 637 dexmedetomidine serum samples were obtained. A two-compartmental model scaled to measured lean weight adequately described the dexmedetomidine pharmacokinetics. Liver blood flow was a covariate for dexmedetomidine clearance (ΔOFV=-5.878). Other factors, including fat mass, histopathological damage, and differential expression of enzymes, did not affect the dexmedetomidine clearance in the population studied (ΔOFV<3.84). CONCLUSIONS We did not find a negative influence of obesity in dexmedetomidine clearance when doses were adjusted to lean body weight. Liver blood flow showed a significant effect on dexmedetomidine clearance. CLINICAL TRIAL REGISTRATION NCT02557867.
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Affiliation(s)
- A Rolle
- División de Anestesiología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - S Paredes
- División de Anestesiología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - L I Cortínez
- División de Anestesiología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - B J Anderson
- Department of Anaesthesiology, University of Auckland, Auckland, New Zealand
| | - N Quezada
- Departamento de Cirugía Digestiva, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - S Solari
- Departamento de Laboratorio Clínico, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - F Allende
- Departamento de Laboratorio Clínico, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - J Torres
- Departamento de Anatomía Patológica, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - D Cabrera
- Departamento de Gastroenterología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile; Departamento de Ciencias Químicas y Biológicas, Facultad de Salud, Universidad Bernardo O'Higgins, Santiago, Chile
| | - V Contreras
- División de Anestesiología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - J Carmona
- División de Anestesiología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - C Ramírez
- División de Anestesiología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - A M Oliveros
- División de Anestesiología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - M Ibacache
- División de Anestesiología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
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Paredes S, Cortínez L, Contreras V, Silbert B. Post-operative cognitive dysfunction at 3 months in adults after non-cardiac surgery: a qualitative systematic review. Acta Anaesthesiol Scand 2016; 60:1043-58. [PMID: 27027720 DOI: 10.1111/aas.12724] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 02/09/2016] [Accepted: 02/11/2016] [Indexed: 12/11/2022]
Abstract
BACKGROUND Post-operative cognitive dysfunction is defined as a decline in cognitive functions that occurs after surgery, but different diagnostic criteria and incidences have been reported in medical literature. Our aim was to determine incidence of post-operative cognitive dysfunction 3 months after non-cardiac surgery in adults. METHODS A systematic review of available evidence was performed by PRISMA guidelines. A search was done in May-July 2015 on PubMed, EMBASE, CINAHL, LILACS, Scielo, Clinical Trials, and Grey Literature Reports. Inclusion criteria were prospective design studies with patients over 18 years old, surgery under general or regional anesthesia, follow-up for 3 months, and use of a neurocognitive battery for diagnosis. We excluded studies made on cardiac or brain surgery patients. Risk of bias was assessed using tools from National Heart Lung and Blood Institute. RESULTS We selected 24 studies. Average age was 68 years. Only five studies reported incidence of cognitive decline for a non-surgical control group. Median number of tests used was 5 (range 3-13). Pooled incidence of post-operative cognitive dysfunction at 3 months was 11.7% [95% CI 10.9-12.5] but with several methodological differences between studies. Increasing age was the most consistent risk factor identified (seven studies). CONCLUSIONS Post-operative cognitive dysfunction in patients is frequent, especially in patients over 60 years old. Limitations include methodological differences in studies. Efforts must be made to reach a consensus in definition and diagnosis for future research.
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Affiliation(s)
- S. Paredes
- Anesthesiology Division; Pontificia Universidad Catolica de Chile; Santiago Chile
| | - L. Cortínez
- Anesthesiology Division; Pontificia Universidad Catolica de Chile; Santiago Chile
| | - V. Contreras
- Anesthesiology Division; Pontificia Universidad Catolica de Chile; Santiago Chile
| | - B. Silbert
- Centre for Anaesthesia and Cognitive Function; Department of Anaesthesia; St Vincent's Hospital; Melbourne Fitzroy Vic. Australia
- Anaesthesia; Perioperative and Pain Medicine Unit; Melbourne Medical School; University of Melbourne; Melbourne Vic. Australia
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13
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Contreras V, Máttar S, González M, Álvarez J, Oteo JA. Coxiella burnetii in bulk tank milk and antibodies in farm workers at Montería, Colombia. REV COLOMB CIENC PEC 2015. [DOI: 10.17533/udea.rccp.v28n2a07] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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14
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Villamar M, Contreras V, Kuntz R, Fregni F. The reporting of blinding in physical medicine and rehabilitation randomized controlled trials: A systematic review. J Rehabil Med 2013; 45:6-13. [DOI: 10.2340/16501977-1071] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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15
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Contreras V, Meneses-Nava MA, Barbosa-García O, Maldonado JL, Ramos-Ortiz G. Double-pulse and calibration-free laser-induced breakdown spectroscopy at low-ablative energies. Opt Lett 2012; 37:4591-4593. [PMID: 23164848 DOI: 10.1364/ol.37.004591] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The use of double-pulse laser-induced breakdown spectroscopy (DP-LIBS) in quantitative analysis generally depends on standards and calibration curves. To our knowledge, in this Letter, we report the first quantitative analysis based on DP-LIBS at low ablative energies with a self-calibrated method. We compare the effects of plasmas on the calibration-free LIBS technique, generated by DP-LIBS, and the traditional single-pulse (SP) LIBS on a steel sample. Our analyses reveal that when SP-LIBS and DP-LIBS reach comparable emission line intensities, plasma parameters and quantitative analysis are practically the same for both experiments. Additionally, we report the behavior of the emission enhancement of some elements (Fe and Cr) at low ablative pulse energies (0.2-8 mJ) using the orthogonal reheating DP-LIBS configuration.
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Affiliation(s)
- V Contreras
- Centro de Investigaciones en Óptica A. C., Loma del Bosque 115, León, Gto. 37150, Mexico.
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16
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Flamar A, Le Grand R, Contreras V, Zurawski S, Dereuddre-Bosquet N, Mangeot I, Martinon F, Oh S, Banchereau J, Zurawski G, Levy Y. Targeting HIV Gag p24 to DICR on dendritic cells induces T cell and potent and long-lasting antibody responses in non-human primates. Retrovirology 2012. [PMCID: PMC3442058 DOI: 10.1186/1742-4690-9-s2-p358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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17
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Contreras V, Carrasco-Labra A, Andrews N, Brignardello-Petersen R, Pantoja R. [Cross-sectional study of deviated nasal septum in unilaterally operated fissures]. Cir Pediatr 2012; 25:75-77. [PMID: 23113393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
INTRODUCTION Nasal septum deviation is one the most significant nasal deformities among cleft and lip patients and its anatomical variations along the anterior-posterior axis within the nasal cavity has not been specified. AIM To define whether there are differences in the degree of nasal septum deviation between the anterior, middle and posterior areas of the nasal cavity in operated unilateral cleft lip and palate patients. MATERIAL AND METHOD Twenty-nine unilateral complete cleft lip and palate patients, between 5 and 17 years, attending San Borja Arriarán Hospital and the University of Chile's School of Dentistry were included. The nasal septum deviation index was measured at different depths across the anteroposterior axis by cone-beam computed tomography. A random effects model was performed for data analysis. RESULTS The nasal septum deviation index presented differences between the three planes studied. The plane with lesser deviation was the anterior, while the plane with greater deviation was the posterior. These differences resulted statistically significant (P < 0.05). CONCLUSION In complete unilateral cleft and lip patients mainly the posterior part of the nasal septum should be corrected, because there is a greater deviation in that area.
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Affiliation(s)
- V Contreras
- Servicio de Cirugía Máxilo-Facial, Hospital Clínico San Borja Arriarán, Santiago de Chile.
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18
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Contreras V, Riquelme M, Kakarieka E, Pantoja R. [A pre-auricular tumour]. ACTA ACUST UNITED AC 2012; 113:136-7. [PMID: 22406197 DOI: 10.1016/j.stomax.2012.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Accepted: 01/23/2012] [Indexed: 11/15/2022]
Affiliation(s)
- V Contreras
- Service de chirurgie maxillo-faciale, hôpital San Borja-Arriarán, Santiago du Chili, Chili
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19
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Bracesco N, Sanchez AG, Contreras V, Menini T, Gugliucci A. Recent advances on Ilex paraguariensis research: minireview. J Ethnopharmacol 2011; 136:378-84. [PMID: 20599603 DOI: 10.1016/j.jep.2010.06.032] [Citation(s) in RCA: 204] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2010] [Revised: 05/04/2010] [Accepted: 06/04/2010] [Indexed: 05/07/2023]
Abstract
Ilex paraguariensis dried and minced leaves are made into a brewed tea, prepared in a sui generis manner by large populations in South America, having evolved from a tea drunk by the Guarani ethnic group to a beverage that has a social and almost ritualistic role in some South American modern societies. It is used both as a source of caffeine, in lieu or in parallel with tea and coffee, but also as a therapeutic agent for its alleged pharmacological properties. Although with some exceptions, research on biomedical properties of this herb has had a late start and strongly lags behind the impressive amount of literature on green tea and coffee. However, in the past 15 years, there was a several-fold increase in the literature studying Ilex paraguariensis properties showing effects such as antioxidant properties in chemical models and ex vivo lipoprotein studies, vaso-dilating and lipid reduction properties, antimutagenic effects, controversial association with oropharyngeal cancer, anti-glycation effects and weight reduction properties. Lately, promising results from human intervention studies have surfaced and the literature offers several developments on this area. The aim of this review is to provide a concise summary of the research published in the past three years, with an emphasis on translational studies, inflammation and lipid metabolism. Ilex paraguariensis reduces LDL-cholesterol levels in humans with Ilex paraguariensis dyslipoproteinemia and the effect is synergic with that of statins. Plasma antioxidant capacity as well as expression of antioxidant enzymes is positively modulated by intervention with Ilex paraguariensis in human cohorts. A review on the evidence implicating Ilex paraguariensis heavy consumption with some neoplasias show data that are inconclusive but indicate that contamination with alkylating agents during the drying process of the leaves should be avoided. On the other hand, several new studies confirm the antimutagenic effects of Ilex paraguariensis in different models, from DNA double breaks in cell culture models to mice studies. Novel interesting work has emerged showing significant effect on weight reduction both in mice and in rat models. Some mechanisms involved are inhibition of pancreatic lipase, activation of AMPK and uncoupling of electron transport. Intervention studies in animals have provided strong evidence of anti-inflammatory effects of Ilex paraguariensis, notably protecting cigarette-induced lung inflammation acting on macrophage migration and inactivating matrix-metalloproteinase. Research on the effects of Ilex paraguariensis in health and disease has confirmed its antioxidant, anti-inflammatory, antimutagenic and lipid-lowering activities. Although we are still waiting for the double-blind, randomized prospective clinical trial, the evidence seems to provide support for beneficial effects of mate drinking on chronic diseases with inflammatory component and lipid metabolism disorders.
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Affiliation(s)
- N Bracesco
- Lab Radiobiología Dpt. Biofísica, Facultades de Medicina y Ciencias, University de la República, Uruguay
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Lorente CE, Holgado S, Elias ADC, Sanchez Segura M, Aleman M, Almada G, Benegas L, Bustos B, Cano Busnelli V, Contreras V, Grondona MP, Jimenez M, Manfredi MP, Ocampo C, Zarba JJ. Promoting healthy youth through a uterine cervical cancer screening program in Tucuman, Argentina. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e12019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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21
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Rosales C, Contreras V, Matos M, Perera R, Villarreal N, García-López D, Pastor JM. Morphological, rheological and mechanical characterization of polypropylene nanocomposite blends. J Nanosci Nanotechnol 2008; 8:1762-1774. [PMID: 18572576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In the present work, the effectiveness of styrene/ethylene-butylene/styrene rubbers grafted with maleic anhydride (MA) and a metallocene polyethylene (mPE) as toughening materials in binary and ternary blends with polypropylene and its nanocomposite as continuous phases was evaluated in terms of transmission electron microscopy (TEM), scanning electron microscopy (SEM), oscillatory shear flow and dynamic mechanical thermal analysis (DMA). The flexural modulus and heat distortion temperature values were determined as well. A metallocene polyethylene and a polyamide-6 were used as dispersed phases in these binary and ternary blends produced via melt blending in a corotating twin-screw extruder. Results showed that the compatibilized blends prepared without clay are tougher than those prepared with the nanocomposite of PP as the matrix phase and no significant changes in shear viscosity, melt elasticity, flexural or storage moduli and heat distortion temperature values were observed between them. However, the binary blend with a nanocomposite of PP as matrix and metallocene polyethylene phase exhibited better toughness, lower shear viscosity, flexural modulus, and heat distortion temperature values than that prepared with polyamide-6 as dispersed phase. These results are related to the degree of clay dispersion in the PP and to the type of morphology developed in the different blends.
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Affiliation(s)
- C Rosales
- Departmento de Mecánica, GPUSB, Universidad Simón Bolívar, Apartado 89000, Caracas 1080A, Venezuela
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22
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Contreras V, Bannura G, Barrera A, Zúñiga C, Melo C, Soto D. [Results of long-term follow-up after local excision for well-selected low rectal cancers]. Rev Esp Enferm Dig 2007; 99:206-9. [PMID: 17590102 DOI: 10.4321/s1130-01082007000400004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE to evaluate our results about local failure, total recurrence and survival. METHOD twenty-one patients underwent a complete local transanal excision for low rectal cancer in our institution during an 18-year period (1985-2003). Preoperative staging included clinical, endoscopic, CT, EUSR, and histopathological findings; pathological specimens were 4 T1, 13 T2 and 4 T3 tumors. None of the T1 patients received another treatment; 6 out of 13 T2 and all of T3 cases were treated with chemoradiotherapy. None of the latter underwent radical surgery. RESULTS follow-up (median 74 months) proved 23.8% for total recurrence and 19.0% for local failure (out of all 3 T2 cases only one received chemoradiotherapy, and one T3 received adjuvant treatment). Five-year survival is 95.2%. CONCLUSIONS this experience allows us to assert that local excision is a good choice in well-selected low rectal cancer patients; for T2 tumors chemoradiotherapy is necessary; in T3 patients radical surgery must be prompt.
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Affiliation(s)
- V Contreras
- Departamento de Cirugía (Centro), Facultad de Medicina, Universidad de Chile, Hospital Clíinico San Borja-Arriarán, Chile.
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Contreras V, Cafiero M, Da Silva S, Rosales C, Perera R, Matos M. Characterization and tensile properties of ternary blends with PA-6 nanocomposites. POLYM ENG SCI 2006. [DOI: 10.1002/pen.20572] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Araque W, Plasencia E, Cortés C, Contreras V. Field evaluation of a diagnostic protocol for Chagas' disease and rangeliosis. Acta Cient Venez 1998; 47:238-43. [PMID: 9460249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The present paper evaluates the protocol for the diagnosis of Chagas' diseases and rangeliosis that is suitable for use in remote and scarcely populated rural areas. Beginning with a blood sample taken by venipuncture in the rural dispensary from 350 inhabitants of Caserío La Sierra, Cojedes State, Venezuela, samples were analyzed at a laboratory located at a distance of 150 Km. Each blood sample was analyzed for blood and clot culture, artificial xenodiagnosis, inoculation into mice, complement fixation reaction (CFR), and indirect fluorescent antibodies test (IFA). Nine isolates of trypanosomes were obtained and identified as Trypanosoma rangeli, 29.4% of the blood samples showed seropositivity for Trypanosoma cruzi, 7.1% of total of persons between 6 and 18 years were found infected with T. rangeli, suggesting active transmission of this trypanosome in an endemic area for Chagas' disease. Results indicate that this protocol of study is reliable, economical and sufficiently versatile to study both rangeliosis and Chagas' disease.
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Affiliation(s)
- W Araque
- Centro de Biología Molecular de Parásitos (Centro BioMolP), Facultad de Ciencias de la Salud, Universidad de Carabobo, Valencia, Venezuela
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Affiliation(s)
- F J Singelyn
- Department of Anesthesiology, Universite Catholique De Louvain School of Medicine, St. Luc Hospital, Brussels, Belgium
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Medina E, Contreras V, Valenzuela M. [Epidemiological aspects of chronic rheumatic diseases in Chile]. Rev Med Chil 1987; 115:889-93. [PMID: 3509827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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27
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Gatica H, Cuchacovich M, Contreras V. [Takayasu's arteritis: study of 11 cases]. Rev Med Chil 1987; 115:737-42. [PMID: 2899339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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28
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Pera M, Fernández-Cruz L, Targarona E, Contreras V. [Non-functioning pancreatic islet cell tumor treated by total pancreatectomy]. Rev Clin Esp 1987; 180:177-8. [PMID: 3033755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Astorga G, Contreras V, Donoso I, Rohmann I, Soto-Aguilar MC. [Synovial chondromatosis of the knee (author's transl)]. Rev Med Chil 1981; 109:740-5. [PMID: 7342251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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30
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Contreras V. [The training of the rheumatologist (author's transl)]. Rev Med Chil 1976; 104:52-3. [PMID: 1085969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Pumarino H, Contreras V, Litvak J, Generini G, Armendariz R, Garces N. [Osteomalacis. II. Chemical and functional studies. Diagnostic criteria]. Rev Med Chil 1972; 100:615-20. [PMID: 5083346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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32
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Pumarino H, Contreras V, Litvak J, Wortsman J. [Osteomalacia. I. Clinical and radiological aspects]. Rev Med Chil 1972; 100:606-14. [PMID: 5083345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Litvac J, Pumarino H, Contreras V, Armendaris R, Alliende I. [Pathogenic and therapeutic studies in resistant osteomalacia to vitamin D]. Rev Med Chil 1970; 98:69-73. [PMID: 5455812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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34
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Muñoz AJ, Contreras V, Etchart M. [Hypertrophic osteoarthropathy in bronchial carcinoma]. Rev Med Chil 1969; 97:649-54. [PMID: 5396751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Litvak J, Contreras V, Oberhauser E, Armendaris R, Alliende I. Acquired nonfamilial osteomalaci. Factors in pathogenesis and the results of long-term treatment with oral phosphate. Am J Med 1968; 44:474-82. [PMID: 5641307 DOI: 10.1016/0002-9343(68)90118-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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36
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Saenz E, Andreis M, Contreras V, Pinto E. [Synovial fluid in various arthropathies]. Rev Med Chil 1968; 96:98-103. [PMID: 5720746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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37
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Contreras V, Litvak J, Wortsman J, Michaud P, Armendaris R, Rojas A. [Urinary hydroxyproline in collagen diseases]. Rev Med Chil 1967; 95:352-5. [PMID: 4157382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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