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Tjader NP, Beer AJ, Ramroop J, Tai MC, Ping J, Gandhi T, Dauch C, Neuhausen SL, Ziv E, Sotelo N, Ghanekar S, Meadows O, Paredes M, Gillespie J, Aeilts A, Hampel H, Zheng W, Jia G, Hu Q, Wei L, Liu S, Ambrosone CB, Palmer JR, Carpten JD, Yao S, Stevens P, Ho WK, Pan JW, Fadda P, Huo D, Teo SH, McElroy JP, Toland AE. Association of ESR1 germline variants with TP53 somatic variants in breast tumors in a genome-wide study. medRxiv 2023:2023.12.06.23299442. [PMID: 38106140 PMCID: PMC10723566 DOI: 10.1101/2023.12.06.23299442] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
Background In breast tumors, somatic mutation frequencies in TP53 and PIK3CA vary by tumor subtype and ancestry. HER2 positive and triple negative breast cancers (TNBC) have a higher frequency of TP53 somatic mutations than other subtypes. PIK3CA mutations are more frequently observed in hormone receptor positive tumors. Emerging data suggest tumor mutation status is associated with germline variants and genetic ancestry. We aimed to identify germline variants that are associated with somatic TP53 or PIK3CA mutation status in breast tumors. Methods A genome-wide association study was conducted using breast cancer mutation status of TP53 and PIK3CA and functional mutation categories including TP53 gain of function (GOF) and loss of function mutations and PIK3CA activating/hotspot mutations. The discovery analysis consisted of 2850 European ancestry women from three datasets. Germline variants showing evidence of association with somatic mutations were selected for validation analyses based on predicted function, allele frequency, and proximity to known cancer genes or risk loci. Candidate variants were assessed for association with mutation status in a multi-ancestry validation study, a Malaysian study, and a study of African American/Black women with TNBC. Results The discovery Germline x Mutation (GxM) association study found five variants associated with one or more TP53 phenotypes with P values <1×10-6, 33 variants associated with one or more TP53 phenotypes with P values <1×10-5, and 44 variants associated with one or more PIK3CA phenotypes with P values <1×10-5. In the multi-ancestry and Malaysian validation studies, germline ESR1 locus variant, rs9383938, was associated with the presence of TP53 mutations overall (P values 6.8×10-5 and 9.8×10-8, respectively) and TP53 GOF mutations (P value 8.4×10-6). Multiple variants showed suggestive evidence of association with PIK3CA mutation status in the validation studies, but none were significant after correction for multiple comparisons. Conclusions We found evidence that germline variants were associated with TP53 and PIK3CA mutation status in breast cancers. Variants near the estrogen receptor alpha gene, ESR1, were significantly associated with overall TP53 mutations and GOF mutations. Larger multi-ancestry studies are needed to confirm these findings and determine if these variants contribute to ancestry-specific differences in mutation frequency.
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Affiliation(s)
- Nijole P. Tjader
- Department of Cancer Biology and Genetics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Abigail J. Beer
- Department of Cancer Biology and Genetics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Johnny Ramroop
- The City College of New York, City University of New York, New York, NY, USA
| | - Mei-Chee Tai
- Cancer Research Malaysia, Subang Jaya, Selangor 47500, Malaysia
| | - Jie Ping
- Division of Epidemiology, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Nashville, TN 37203
| | - Tanish Gandhi
- Biomedical Sciences, The Ohio State University College of Medicine, Columbus, OH 43210, USA
- The Ohio State University Medical School, Columbus, OH, 43210, USA
| | - Cara Dauch
- Department of Cancer Biology and Genetics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
- The Ohio State University Wexner Medical Center, Clinical Trials Office, Columbus, OH 43210, USA
| | - Susan L. Neuhausen
- Beckman Research Institute of City of Hope, Department of Population Sciences, Duarte, CA, USA
| | - Elad Ziv
- University of California, Helen Diller Family Comprehensive Cancer Center, San Francisco, San Francisco, CA, USA
- University of California, Department of Medicine, San Francisco, San Francisco, CA, USA
- University of California San Francisco, Institute for Human Genetics, San Francisco, CA, USA
| | - Nereida Sotelo
- Department of Cancer Biology and Genetics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Shreya Ghanekar
- Department of Cancer Biology and Genetics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Owen Meadows
- Biomedical Sciences, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Monica Paredes
- Biomedical Sciences, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Jessica Gillespie
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - Amber Aeilts
- Department of Internal Medicine, Division of Human Genetics, The Ohio State University, Columbus, OH, 43210, USA
| | - Heather Hampel
- Department of Medical Oncology & Therapeutics Research, City of Hope National Medical Center, Duarte, CA, USA
| | - Wei Zheng
- Division of Epidemiology, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Nashville, TN 37203
| | - Guochong Jia
- Division of Epidemiology, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Nashville, TN 37203
| | - Qiang Hu
- Department of Biostatistics and Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Lei Wei
- Department of Biostatistics and Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Song Liu
- Department of Biostatistics and Bioinformatics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Christine B. Ambrosone
- Department of Cancer Control and Prevention, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Julie R. Palmer
- Slone Epidemiology Center at Boston University, Boston, MA, USA
| | - John D. Carpten
- City of Hope Comprehensive Cancer Center, Duarte, CA, USA
- Department of Integrative Translational Sciences, City of Hope, Duarte, CA
| | - Song Yao
- Department of Cancer Control and Prevention, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Patrick Stevens
- The Ohio State University Comprehensive Cancer Center, Bioinformatics Shared Resource, Columbus, OH, USA
| | - Weang-Kee Ho
- Cancer Research Malaysia, Subang Jaya, Selangor 47500, Malaysia
- School of Mathematical Sciences, Faculty of Science and Engineering, University of Nottingham Malaysia, Semenyih, Selangor 43500, Malaysia
| | - Jia Wern Pan
- Cancer Research Malaysia, Subang Jaya, Selangor 47500, Malaysia
| | - Paolo Fadda
- The Ohio State University Comprehensive Cancer Center, Genomics Shared Resource, Columbus, OH, USA
| | - Dezheng Huo
- Department of Public Health Sciences, University of Chicago, Chicago, IL, 60637, USA
| | - Soo-Hwang Teo
- Cancer Research Malaysia, Subang Jaya, Selangor 47500, Malaysia
- Faculty of Medicine, University Malaya Cancer Research Institute, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Joseph Paul McElroy
- The Ohio State University Center for Biostatistics, Department of Biomedical Informatics, Columbus, OH, USA
| | - Amanda Ewart Toland
- Department of Cancer Biology and Genetics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
- Department of Internal Medicine, Division of Human Genetics, The Ohio State University, Columbus, OH, 43210, USA
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Villodre C, Taccogna L, Zapater P, Cantó M, Mena L, Ramia JM, Lluís F, Afonso N, Aguilella V, Aguiló J, Alados JC, Alberich M, Apio AB, Balongo R, Bra E, Bravo-Gutiérrez A, Briceño FJ, Cabañas J, Cánovas G, Caravaca I, Carbonell S, Carrera-Dacosta E, Castro EE, Caula C, Choolani-Bhojwani E, Codina A, Corral S, Cuenca C, Curbelo-Peña Y, Delgado-Morales MM, Delgado-Plasencia L, Doménech E, Estévez AM, Feria AM, Gascón-Domínguez MA, Gianchandani R, González C, Hevia RJ, González MA, Hidalgo JM, Lainez M, Lluís N, López F, López-Fernández J, López-Ruíz JA, Lora-Cumplido P, Madrazo Z, Marchena J, de la Cuadra MB, Martín S, Casas MI, Martínez P, Mena-Mateos A, Morales-García D, Mulas C, Muñoz-Forner E, Naranjo A, Navarro-Sánchez A, Oliver I, Ortega I, Ortega-Higueruelo R, Ortega-Ruiz S, Osorio J, Padín MH, Pamies JJ, Paredes M, Pareja-Ciuró F, Parra J, Pérez-Guarinós CV, Pérez-Saborido B, Pintor-Tortolero J, Plua-Muñiz K, Rey M, Rodríguez I, Ruiz C, Ruíz R, Ruiz S, Sánchez A, Sánchez D, Sánchez R, Sánchez-Cabezudo F, Sánchez-Santos R, Santos J, Serrano-Paz MP, Soria-Aledo V, Tallón-Aguilar L, Valdivia-Risco JH, Vallverdú-Cartié H, Varela C, Villar-Del-Moral J, Zambudio N. Simplified risk-prediction for benchmarking and quality improvement in emergency general surgery. Prospective, multicenter, observational cohort study. Int J Surg 2022; 97:106168. [PMID: 34785344 DOI: 10.1016/j.ijsu.2021.106168] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/24/2021] [Accepted: 11/03/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND AIMS Emergency General Surgery (EGS) conditions account for millions of deaths worldwide, yet it is practiced without benchmarking-based quality improvement programs. The aim of this observational, prospective, multicenter, nationwide study was to determine the best benchmark cutoff points in EGS, as a reference to guide improvement measures. METHODS Over a 6-month period, 38 centers (5% of all public hospitals) attending EGS patients on a 24-h, 7-days a week basis, enrolled consecutive patients requiring an emergent/urgent surgical procedure. Patients were stratified into cohorts of low (i.e., expected morbidity risk <33%), middle and high risk using the novel m-LUCENTUM calculator. RESULTS A total of 7258 patients were included; age (mean ± SD) was 51.1 ± 21.5 years, 43.2% were female. Benchmark cutoffs in the low-risk cohort (5639 patients, 77.7% of total) were: use of laparoscopy ≥40.9%, length of hospital stays ≤3 days, any complication within 30 days ≤ 17.7%, and 30-day mortality ≤1.1%. The variables with the greatest impact were septicemia on length of hospital stay (21 days; adjusted beta coefficient 16.8; 95% CI: 15.3 to 18.3; P < .001), and respiratory failure on mortality (risk-adjusted population attributable fraction 44.6%, 95% CI 29.6 to 59.6, P < .001). Use of laparoscopy (odds ratio 0.764, 95% CI 0.678 to 0.861; P < .001), and intraoperative blood loss (101-500 mL: odds ratio 2.699, 95% CI 2.152 to 3.380; P < .001; and 500-1000 mL: odds ratio 2.875, 95% CI 1.403 to 5.858; P = .013) were associated with increased morbidity. CONCLUSIONS This study offers, for the first time, clinically-based benchmark values in EGS and identifies measures for improvement.
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Affiliation(s)
- C Villodre
- Hospital Gran Canaria Doctor Negrín, Las Palmas de Gran Canarias, Spain Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain Hospital Lluís Alcanyís de Xàtiva, Valencia, Spain Hospital Universitario de Badajoz, Badajoz, Spain Hospital Universitario de Bellvitge, Barcelona, Spain Hospital Marina Baixa, Alicante, Spain Hospital Juan Ramón Jiménez, Infanta Elena, Huelva, Spain Hospital Infanta Cristina, Parla, Madrid, Spain Hospital Universitario de Canarias, Tenerife, Spain Hospital Reina Sofía de Córdoba, Córdoba, Spain H. Ramón y Cajal, Madrid, Spain Hospital Parc Taulí de Sabadell, Barcelona, Spain Hospital General Universitario de Alicante, Alicante, Spain Complejo Hospitalario Universitario de Vigo, Hospital Pontevedra, Spain Hospital Trueta de Girona, Girona, Spain Hospital Universitario Rio Hortega, Valladolid, Spain Hospital Mutua Terrassa, Barcelona, Spain Consorci Hospitalari de Vic, Barcelona, Spain POVISA, Pontevedra, Spain Hospital Universitario Nuestra Señora de Candelaria, Tenerife, Spain Hospital Universitario Basurto, Bizkaia, Spain Hospital Universitario Marqués de Valdecilla, Santander, Spain Hospital de Viladecans, Barcelona, Spain Hospital Clínico de Valencia, Valencia, Spain Hospital Universitario Insular de Gran Canaria, Las Palmas, Spain Hospital Vírgen de la Macarena, Sevilla, Spain Hospital Cabueñes, Gijón, Spain Complejo Hospitalario de Jaén, Jaén, Spain Hospital Universitari Sant Joan de Reus, Tarragona, Spain Hospital Universitario Infanta Sofía, Madrid, Spain Complejo Hospitalario Torrecárdenas, Almería, Spain Hospital Sant Pau i Santa Tecla, Tarragona, Spain Hospital General Rafael Méndez de Lorca, Murcia, Spain Hospital Vírgen del Rocío, Sevilla, Spain Hospital Morales Meseguer, Murcia, Spain Hospital del Vinalopó, Alicante, Spain Hospital Universitario del Vinalopó, Alicante, Spain Hospital Universitario Virgen de las Nieves, Granada, Spain Department of Surgery, General University Hospital of Alicante, Alicante, Spain Department of Clinical Pharmacology, General University Hospital of Alicante, Alicante, Spain Computing, BomhardIP, Alicante, Spain Department of Clinical Documentation, General University Hospital of Alicante, Alicante, Spain Institute of Health and Biomedical Research of Alicante, ISABIAL, Alicante, Spain
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Gallegos C, Paredes M, Liu Y, Spatz E, Miller E. 360Sex differences in imaging referral patterns and angiographic referral rates among emergency department chest pain unit patients. Eur Heart J Cardiovasc Imaging 2019. [DOI: 10.1093/ehjci/jez146.007] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- C Gallegos
- Yale University, New Haven, United States of America
| | - M Paredes
- Yale University, New Haven, United States of America
| | - Y Liu
- Yale University, New Haven, United States of America
| | - E Spatz
- Yale University, New Haven, United States of America
| | - E Miller
- Yale University, New Haven, United States of America
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McCoy C, Paredes M, Allen S, Blackey J, Nielsen C, Paluzzi A, Jonas B, Radovich P. Catheter-Associated Urinary Tract Infections: Implementing a Protocol to Decrease Incidence in Oncology Populations
. Clin J Oncol Nurs 2017; 21:460-465. [PMID: 28738041 DOI: 10.1188/17.cjon.460-465] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND The impact of catheter-associated urinary tract infections (CAUTIs) on immunocompromised patients with cancer requires preventive intervention from bedside nurses.
. OBJECTIVES This protocol aims to prevent CAUTIs in the inpatient oncology population by implementing an evidence-based, nurse-driven protocol for discontinuing indwelling urinary catheters (IUCs).
. METHODS Following a literature review of 34 articles, a nurse-driven CAUTI prevention protocol was developed and implemented on two 26-bed oncology units. Unit staff were educated on the protocol and use of the audit tool.
. FINDINGS Although CAUTI rates remained unchanged, infections per 1,000 IUC days decreased, and adherence among oncology nurses rose 66%-90% within the first two months. The protocol encouraged preventive intervention from RNs to protect patients with cancer from CAUTIs.
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Torres G, Paredes M, Hernández A, García C, Sánchez Bueno F, Canteras M, Parrilla P, Gómez J. [Epidemiology and risk factors of patients with intra-abdominal postsurgical infection treated with tigecycline: a cohort study]. Rev Esp Quimioter 2017; 30:28-33. [PMID: 28010058] [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: 06/06/2023]
Abstract
OBJECTIVE To study a cohort of patients with intra-abdominal postsurgical infection treated with tigecycline to analyze its effectiveness and mortality related factors. METHODS Prospective study of patients with intra-abdominal postsurgical infection with microbiological isolation and treated with tigecycline. RESULTS Out of 103 patients only 61 full fit inclusion criteria. Mean age was 67 year-old and 72% were male. Charlson score was ≥ 3 in 65.5%, being diabetes and colon cancer the most prevalent diseases. Cancer surgery was the most frequent procedure (n=44, 72%) and previous antibiotic administration was present in 43 cases (69%). Pitt score was ≥ 3 in 69% and most prevalent bacteria were Escherichia coli (38 %), Enterococcus spp. (34%; mainly Enterococcus faecium) and Klebsiella pneumoniae together with Enterobacter cloacae (28%). Tigecycline was prescribed alone (17; 28%) or in combination with other antibiotics (44; 72%), mainly meropenem (25; 57%) or amikacin (19, 43%). 11 patients died (18%), all of which suffered extended cancer surgery and isolation of extended-spectrum betalactamase producing Enterobacteriaceae. Factors statistically associated to death in univariate analysis were Charlson score >3, pH <7.3 and leucocyte count >20.000 cells/mm3. CONCLUSIONS As being a cohort of patients treated with tigecycline, E. faecium isolation was very frequent. Non-fatal evolution was achieved in 82% cases, being tigecycline a potentially good option in the empiric treatment of very severe infections.
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Affiliation(s)
| | | | | | | | | | | | | | - J Gómez
- Joaquín Gómez, Servicio de Medicina Interna-Infecciosas del HCUVA. Departamento de Medicina Interna. Facultad de Medicina Universidad de Murcia. IMIB Arrixaca
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Matamala F, Cornejo R, Paredes M, Farfán E, Garrido O, Alves N. Análisis Comparativo del Número de Neurofilamentos en Nervios Isquiáticos de Rata Sometidos a Neuropraxia Tratadas con Láser de Baja Intensidad y Ultrasonido Terapéutico. INT J MORPHOL 2014. [DOI: 10.4067/s0717-95022014000100058] [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: 11/17/2022]
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Paredes M, Gomez Y, Torres M, Fernandez M, Tovar M. P3.067 Prevalence of Chlamydia Trachomatis and Neisseria Gonorrhoeae in High School Students Between 14 and 19 Years-Old Using a Non-Invasive Technique. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0527] [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: 11/04/2022]
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Monteiro F, Rodrigues H, Kalil J, Castro MC, Panajotopoulos N, Paredes M, Massarolo P, Mies S. Pre- and posttransplant monitoring of alloantibodies by complement-dependent cytotoxicity and luminex methodologies in liver transplantation. Transplant Proc 2013; 44:2411-2. [PMID: 23026608 DOI: 10.1016/j.transproceed.2012.07.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND This study evaluated the influence of circulating anti-HLA antibodies on outcomes of 97 liver allografts from deceased donors. METHODS Human leukocyte antigen (HLA) antibody screening was performed by both complement-dependent cytotoxicity (CDC) and multiparameter Luminex microsphere-based assays (Luminex assay). RESULTS The agreements between T- and B- cell CDC and Luminex assays were 67% and 77% for pre- and posttransplant specimens, respectively. Graft dysfunction was not associated with either positive pretransplant CDC or Luminex panel-reactive antibody (PRA) values. Likewise, positive posttransplant T- or B- cell CDC PRA values were not associated with graft dysfunction. In contrast, posttransplant Luminex PRA values were significantly higher among patients with graft dysfunction compared with subjects with good outcomes (P = .017). CONCLUSION Posttransplant monitoring of HLA antibodies with Luminex methodology allowed identification of patients at high-risk for poor graft outcomes.
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Affiliation(s)
- F Monteiro
- Laboratory of Transplantation Immunology, University of São Paulo Medical School, São Paulo, Brazil.
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Prieto L, Alves C, Zimmermann B, Tagliabracci A, Prieto V, Montesino M, Whittle M, Anjos M, Cardoso S, Heinrichs B, Hernandez A, López-Parra A, Sala A, Saragoni V, Burgos G, Marino M, Paredes M, Mora-Torres C, Angulo R, Chemale G, Vullo C, Sánchez-Simón M, Comas D, Puente J, López-Cubría C, Modesti N, Aler M, Merigioli S, Betancor E, Pedrosa S, Plaza G, Masciovecchio M, Schneider P, Parson W. GHEP-ISFG proficiency test 2011: Paper challenge on evaluation of mitochondrial DNA results. Forensic Sci Int Genet 2013; 7:10-5. [DOI: 10.1016/j.fsigen.2012.04.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Revised: 04/06/2012] [Accepted: 04/20/2012] [Indexed: 11/16/2022]
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Montesino M, Tagliabracci A, Zimmermann B, Gusmao L, Burgos G, Heinrichs B, Prieto V, Paredes M, Hernandez A, Cardoso S, Vullo C, Marino M, Whittle M, Velázquez M, Sánchez-Simón M, Maxud K, Anjos M, Vargas-Díaz L, López-Parra A, Bobillo C, García-Segura R, Puente J, Pedrosa S, Streintenberger E, Moreno F, Chemale G, Pestano J, Merigioli S, Espinoza M, Comas D, López-Cubría C, Bogus M, Prieto L, Parson W. GHEP-ISFG Proficiency Test 2011: Paper challenge on evaluation of mitochondrial DNA results. Forensic Science International: Genetics Supplement Series 2011. [DOI: 10.1016/j.fsigss.2011.10.015] [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: 11/29/2022]
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Monteiro F, Rodrigues H, Kalil-Filho JE, Paredes M, Massarolo P, Mies S. POST-TRANSPLANT HLA ANTIBODIES DETECTED BY LUMINEX DONOR-SPECIFIC CROSSMATCH CORRELATE WITH POOR LIVER GRAFT OUTCOME. Transplantation 2010. [DOI: 10.1097/00007890-201007272-00529] [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: 11/25/2022]
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Monteiro F, Rodrigues H, Kalil-Filho JE, Adams P, Paredes M, Massarolo P, Mies S. CLINICAL RELEVANCE OF PRE- AND POST- TRANSPLANT ALLOANTIBODIES DETECTED BY COMPLEMENT-DEPENDENT CYTOTOXICITY AND LUMINEX METHODOLOGIES IN LIVER TRANSPLANTATION. Transplantation 2010. [DOI: 10.1097/00007890-201007272-00187] [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: 11/25/2022]
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Koch E, Romero T, Romero CX, Akel C, Manríquez L, Paredes M, Román C, Taylor A, Vargas M, Kirschbaum A. Impact of education, income and chronic disease risk factors on mortality of adults: does 'a pauper-rich paradox' exist in Latin American societies? Public Health 2009; 124:39-48. [PMID: 20036407 DOI: 10.1016/j.puhe.2009.11.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2009] [Revised: 10/27/2009] [Accepted: 11/18/2009] [Indexed: 11/15/2022]
Abstract
OBJECTIVES To test the hypothesis that an inverse association exists between socio-economic position and all-cause mortality in a developing country in Latin America. STUDY DESIGN Prospective cohort study carried out in Chile using data from a simple random sample of 920 apparently healthy subjects (weighted population 11,600 aged 30-89 years) followed for 8 years. METHODS Education level (0-8 years, 9-12 years and > or = 13 years) and income quartiles were established at the outset of the study, along with behavioural and biological risk factors for chronic diseases: smoking, alcohol use, obesity, diabetes, hypertension, lipids and family history of death by cardiovascular disease. Relative risks of all-cause mortality were estimated using age-adjusted Cox regression models. RESULTS During the follow-up period, 46 deaths were observed. Adjusting for age, gender, and behavioural and biological risk factors, the mortality risk for increasing categories of education after controlling for income was 1.0, 0.76 and 0.33 (P for trend<0.01). In contrast, the relative risk for increasing levels of income after controlling for education was 1.0, 0.98, 1.33 and 1.17 (P for trend=0.07). CONCLUSION While education level had a protective effect on mortality risk of Chilean adults, income had a slightly unfavourable effect on survival. This finding is described as suggestive of a 'pauper-rich paradox', since the higher income quantiles in this study correspond with the lower income levels in most developed countries. Nevertheless, due to the small number of deaths, additional research is required to assess the validity of these findings.
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Affiliation(s)
- E Koch
- Department of Family Medicine, Faculty of Medicine, University of Chile, San Miguel, Santiago, Chile.
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Paredes M, Norambuena M, Molina B. Diversidad genética de 12 LOCI microsatelitales utilizados en pruebas de paternidad equina en Chile. Arch zootec 2009. [DOI: 10.4321/s0004-05922009000100012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Koch E, Bogado M, Araya F, Romero T, Díaz C, Manriquez L, Paredes M, Román C, Taylor A, Kirschbaum A. Impact of parity on anthropometric measures of obesity controlling by multiple confounders: a cross-sectional study in Chilean women. J Epidemiol Community Health 2008; 62:461-70. [PMID: 18413461 DOI: 10.1136/jech.2007.062240] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIM To find out whether there is an association between parity and obesity, evaluated through body mass index (BMI), waist circumference (WC), waist-to-hip ratio (WHR) and waist-to-height ratio (WHtR) in Chilean women after controlling for sociodemographic characteristics, health risk and gynaeco-obstetric factors. DESIGN Cross-sectional study, using baseline data of the San Francisco Project. SETTING San Francisco de Mostazal, located in the central region of Chile, 6512 Chilean-Hispanic women (Spanish heritage with a variable indigenous component). METHODS A weighted random sample of 508 women who had their first pregnancy inside the primary child-bearing ages. Data were collected between 1997 and 1999. Statistical associations between parity and different anthropometric measurements of adiposity in multiple linear (MLnR) and logistic regression models (MLtR) were evaluated. RESULTS In MLnR a modest parity-related increment in BMI and practically null increment in WC, WHR and WHtR was observed. Covariates that showed a statistically significant association with anthropometric measures of adiposity were age, low education, marital status, employment, smoking, smoking cessation, hypertension, diabetes, dyslipidaemia, parent's obesity, menarche and fetal macrosomia. Crude odds ratio (OR) showed a strong association between parity and anthropometric markers of obesity. Nevertheless, after adjustments in MLtR models, the association remained only for BMI. All the measures of abdominal obesity related to parous women showed OR smaller than 1 (95% confidence intervals 0.57 to 0.96). CONCLUSIONS Parity modestly influences BMI, but does not seem to be related to WC, WHR and WHtR after controlling by confounders. Parity can increase adiposity but not necessarily following an abdominal pattern.
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Affiliation(s)
- E Koch
- Division of Epidemiology, School of Public Health, Faculty of Medicine, University of Chile, Santiago, Chile.
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Paredes M, Norambuena MC, Molina B. Diversidad genética de 12 LOCI microsatelitales utilizados en pruebas de paternidad equina en Chile. ARCH ZOOTEC 2007. [DOI: 10.21071/az.v58i221.5326] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Se investigó la diversidad genética de 12 loci microsatelitales (HMS2, HMS3, HMS6, HMS7, HTG4, HTG6, AHT4, AHT5, VHL20, ASB2, HTG7 y HTG10) utilizados en pruebas de filiación equina en Chile en una muestra poblacional de 45 caballos Criollos chilenos por medio del contenido de información polimórfica, heterocigosis y exceso o déficit de heterocigotos. Además, se estimó la probabilidad de exclusión de paternidad por locus y general considerando los 12 loci. Los resultados indican que la variabilidad genética de los microsatélites analizados es significativamente elevada en la población estudiada. Todos los loci analizados resultaron polimórficos. El número de alelos por locus, varió entre 4 y 10. La heterocigosis esperada promedio (He), considerando todos los loci, fue de 0,76, con un rango que osciló entre 0,52 y 0,88. El promedio de la heterocigosis observada (Ho) sobre el conjunto de todos los marcadores fue de 0,65. La probabilidad de exclusión de paternidad por locus osciló entre 14 a 59%. Al considerar los 12 loci en conjunto, la exclusión de paternidad se puede atribuir con 99,7% de certeza.
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Becerra V, Paredes M, Madariaga R, Bariana HS, Mellado M, Rojo C. High genetic diversity in Chilean populations of wheat yellow rust (Puccinia striiformis f. sp. tritici West.) assessed by RAPD and AFLP. ACTA ACUST UNITED AC 2007. [DOI: 10.1071/ar07127] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Wheat yellow rust (Puccinia striiformis f. sp. tritici West. PST) is one of the main fungal diseases that causes major yield losses in the central and southern wheat production area of Chile. Chilean plant breeding programs have been using specific resistance genes to control this disease and resistance was frequently lost due to the appearance of new pathotypes of this pathogen. This resulted in a frequent change of wheat cultivars in the country. The objective of this work was to determine the genetic polymorphism among PST samples collected in wheat fields throughout the country, using randomly amplified polymorphic DNA (RAPD), and amplified fragment length polymorphism (AFLP). Twenty-nine PST populations from 5 locations were analysed with 64 RAPD primers and 6 combinations of AFLP primers. The coefficients of similarity (53% for RAPD and 14% for AFLP) indicated that the populations of yellow rust in Chile are highly diverse, in contrast with similar studies performed in other countries. This observation is supported by the virulence spectrum of PST population. This stressed the need to pyramid 2 or more major genes in commercial cultivars. Alternatively, the deployment of adult plant resistance gene combinations should be conducted. AFLP technique was more robust for analysis of the genetic diversity of PST compared with RAPD, because of its reproducibility and high level of polymorphism. The analysis of genetic similarity data among yellow rust populations grouped most of the PST population according to their geographic origin.
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Montesino M, Salas A, Crespillo M, Albarrán C, Alonso A, Alvarez-Iglesias V, Cano JA, Carvalho M, Corach D, Cruz C, Di Lonardo A, Espinheira R, Farfán MJ, Filippini S, García-Hirschfeld J, Hernández A, Lima G, López-Cubría CM, López-Soto M, Pagano S, Paredes M, Pinheiro MF, Rodríguez-Monge AM, Sala A, Sóñora S, Sumita DR, Vide MC, Whittle MR, Zurita A, Prieto L. Analysis of body fluid mixtures by mtDNA sequencing: An inter-laboratory study of the GEP-ISFG working group. Forensic Sci Int 2006; 168:42-56. [PMID: 16899347 DOI: 10.1016/j.forsciint.2006.06.066] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2006] [Revised: 06/15/2006] [Accepted: 06/17/2006] [Indexed: 10/24/2022]
Abstract
The mitochondrial DNA (mtDNA) working group of the GEP-ISFG (Spanish and Portuguese Group of the International Society for Forensic Genetics) carried out an inter-laboratory exercise consisting of the analysis of mtDNA sequencing patterns in mixed stains (saliva/semen and blood/semen). Mixtures were prepared with saliva or blood from a female donor and three different semen dilutions (pure, 1:10 and 1:20) in order to simulate forensic casework. All labs extracted the DNA by preferential lysis and amplified and sequenced the first mtDNA hypervariable region (HVS-I). Autosomal and Y-STR markers were also analysed in order to compare nuclear and mitochondrial results from the same DNA extracts. A mixed stain prepared using semen from a vasectomized individual was also analysed. The results were reasonably consistent among labs for the first fractions but not for the second ones, for which some laboratories reported contamination problems. In the first fractions, both the female and male haplotypes were generally detected in those samples prepared with undiluted semen. In contrast, most of the mixtures prepared with diluted semen only yielded the female haplotype, suggesting that the mtDNA copy number per cell is smaller in semen than in saliva or blood. Although the detection level of the male component decreased in accordance with the degree of semen dilution, it was found that the loss of signal was not consistently uniform throughout each electropherogram. Moreover, differences between mixtures prepared from different donors and different body fluids were also observed. We conclude that the particular characteristics of each mixed stain can deeply influence the interpretation of the mtDNA evidence in forensic mixtures (leading in some cases to false exclusions). In this sense, the implementation of preliminary tests with the aim of identifying the fluids involved in the mixture is an essential tool. In addition, in order to prevent incorrect conclusions in the interpretation of electropherograms we strongly recommend: (i) the use of additional sequencing primers to confirm the sequencing results and (ii) interpreting the results to the light of the phylogenetic perspective.
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Lu Q, Mukhopadhyay NK, Griffin JD, Paredes M, Medina M, Kosik KS. Brain armadillo protein delta-catenin interacts with Abl tyrosine kinase and modulates cellular morphogenesis in response to growth factors. J Neurosci Res 2002; 67:618-24. [PMID: 11891774 DOI: 10.1002/jnr.10151] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
delta-Catenin associates with adhesive junctions and facilitates cellular morphogenesis (Lu et al., 1999). Here we show that delta-catenin colocalizes with actin filaments and Abl tyrosine kinase in the growth cones of cultured hippocampal neurons. PC12 cells induced to express delta-catenin show accelerated neurite extension upon nerve growth factor (NGF) stimulation. STI571, an Abl family kinase inhibitor, further accentuates these stimulatory effects. delta-Catenin is a potent substrate for Abl in vitro using an immunocomplex assay and most of the Abl-induced tyrosine phosphorylation within cells is present in the N-terminus of delta-catenin. When delta-catenin-expressing epithelial cells are induced to scatter in response to hepatocyte growth factor (HGF), STI571 leads to the rapid redistribution of delta-catenin and changes in cellular morphology. We suggest that delta-catenin is a possible Abl substrate and acts downstream of Abl to orchestrate actin-based cellular morphogenesis.
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Affiliation(s)
- Q Lu
- Center for Neurologic Diseases, Brigham and Women's Hospital, Boston, Massachusetts, USA.
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20
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Mora M, Skiles R, McKinney B, Paredes M, Buckler D, Papoulias D, Klein D. Environmental contaminants in prey and tissues of the peregrine falcon in the Big Bend Region, Texas, USA. Environ Pollut 2002; 116:169-176. [PMID: 11808550 DOI: 10.1016/s0269-7491(01)00207-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Peregrine falcons (Falco peregrinus) have been recorded nesting in Big Bend National Park, Texas, USA and other areas of the Chihuahuan Desert since the early 1900s. From 1993 to 1996, peregrine falcon productivity rates were very low and coincided with periods of low rainfall. However, low productivity also was suspected to be caused by environmental contaminants. To evaluate potential impacts of contaminants on peregrine falcon populations, likely avian and bat prey species were collected during 1994 and 1997 breeding seasons in selected regions of western Texas, primarily in Big Bend National Park. Tissues of three peregrine falcons found injured or dead and feathers of one live fledgling also were analyzed. Overall, mean concentrations of DDE [1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene], a metabolite of DDT [1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane], were low in all prey species except for northern rough-winged swallows (Stelgidopteryx serripennis, mean = 5.1 microg/g ww). Concentrations of mercury and selenium were elevated in some species, up to 2.5 microg/g dw, and 15 microg/g dw, respectively, which upon consumption could seriously affect reproduction of top predators. DDE levels near 5 microg/g ww were detected in carcass of one peregrine falcon found dead but the cause of death was unknown. Mercury, selenium, and DDE to some extent, may be contributing to low reproductive rates of peregrine falcons in the Big Bend region.
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Affiliation(s)
- M Mora
- US Geological Survey, Columbia Environmental Researeh Center, Wildlife and Fisheries Sciences, Texas A&M University, College Station 77843-2258, USA.
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Abstract
OBJECTIVE The purpose of this study was to explore how mothers' developmental history and current functioning affects their sexually abused children's functioning and recovery. METHOD A sample of 67 African-American mothers and their sexually abused children participated in this study. Interviews and a range of adult and child measures were administered in order to assess maternal developmental history and current functioning, and child functioning. RESULTS Mothers' past experiences as children were associated with their children's behavior and general functioning following the sexual abuse. Mothers who experienced more discontinuity of childhood care, who were sexually abused as children, and/or had more problems in their family of origin had children who showed poorer functioning and more behavioral symptomatology. In addition, mothers who currently were experiencing more trauma symptomatology, reported substance abuse, and/or were less able to provide support to their children, had children with more behavior problems and poorer functioning. CONCLUSIONS The findings from this study point to the impact of mothers' developmental history and current functioning upon the symptomatology of their sexually abused children.
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Affiliation(s)
- M Paredes
- Illinois School of Professional Psychology, Chicago, USA
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22
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Paredes M, Weir E, Gil K. [Reproduction of the bird Mimus gilvus (Passeriformes: Mimidae) in Maracaibo, Venezuela]. REV BIOL TROP 2001; 49:1143-6. [PMID: 12189795] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023] Open
Abstract
Four pairs of the poorly understood tropical mockingbird Mimus gilvus were captured and color banded at a grassland in Maracaibo, Venezuela in June 1997. Throughout the following 8 months, individuals were observed two days per week for 4 hours each. We recorded courtship behaviour, nest construction, incubation, parental care, territory defense and timing of reproductive cycle. Pairs lived in defined territories defended primarily by the male. Both sexes participated in nest building which began at the start of two rainy seasons: April and October. Between April and June, 80% of nests were parasited by the shiny cowbird (Molothrus bonariensis). No parasitism was recorded in the later nesting season. Consequently, breeding success for the April and October seasons was 20% and 83% respectively. Only the female incubated and the mean clutch size was 2.2 eggs.
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Affiliation(s)
- M Paredes
- Universidad del Zulia, Departamento de Biología, Módulo 1, Laboratorio de Ecología, Apdo. 526, Maracaibo, Venezuela.
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Marin DB, Flynn S, Mare M, Lantz M, Hsu MA, Laurans M, Paredes M, Shreve T, Zaklad GR, Mohs RC. Reliability and validity of a chronic care facility adaptation of the Clinical Dementia Rating scale. Int J Geriatr Psychiatry 2001; 16:745-50. [PMID: 11536340 DOI: 10.1002/gps.385] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
OBJECTIVE This study investigated the reliability and validity of a chronic care facility adaptation of the Clinical Dementia Rating scale (CDR-CC). METHOD Sixty-two residents in a chronic care facility participated in an inter-rater and 1 month test-retest reliability study. The instrument was validated against the Mini-Mental State Examination (MMSE). RESULTS Inter-rater and 1 month test-retest reliability for the global CDR-CC score were excellent (intraclass correlation coefficients 0.99 and 0.92, respectively). The CDR-CC domain and global scores were negatively correlated with the MMSE. CONCLUSIONS The CDR-CC is a global assessment tool that reliably and validly measures cognitive and functional impairment in a chronic care setting.
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Affiliation(s)
- D B Marin
- Department of Psychiatry, Mount Sinai School of Medicine, New York, NY 10029, USA.
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Culasso C, Carvajal L, Paolucci R, Ceballos A, Paredes M. [Streptococcus pneumoniae: evolution of antibiotic resistance in a pediatric hospital in Córdoba, Argentina]. Rev Argent Microbiol 2001; 33:149-54. [PMID: 11594005] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023] Open
Abstract
The wide variety of prevalence of antimicrobial resistant Streptococcus pneumoniae in different countries confirms the importance of determining local patterns of resistance. From 1992 to 2000, we studied the pattern of antimicrobial resistance in S. pneumoniae and its evolution along the years, using 468 strains isolated in the Hospital de Niños de Córdoba. A total of 177 isolates (37.8%) were not susceptible to penicillin, with 19% intermediate and 18.8% resistant strains. High and intermediate resistance levels to cefotaxime were 4.9% and 10.9%, respectively. Decreased susceptibility to trimethoprim/sulfamethoxazole (TMS), erythromycin, chloramphenicol, and rifampin was found in 194 isolates (41.5%), 32 (6.8%), 13 (2.8%) and 3 (0.6%), respectively. No isolates resistant to vancomycin were detected. The most commonly combined resistance patterns were: penicillin/TMS (35.6%) and penicillin/TMS/cefotaxime (11.8%). This study highlights the increased rate of drug resistant S. pneumoniae during the last years, and the importance of antimicrobial resistance surveillance of adequate empirical therapy involving local and regional susceptibility patterns.
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Affiliation(s)
- C Culasso
- Hospital de Niños de la Santísima Trinidad, Guido Spano y Bajada Pucará, Barrio Crisol, 5000 Córdoba, Argentina.
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Crespillo M, Luque JA, Paredes M, Fernández R, Ramírez E, Valverde JL. Mitochondrial DNA sequences for 118 individuals from northeastern Spain. Int J Legal Med 2001; 114:130-2. [PMID: 11197620 DOI: 10.1007/s004140000158] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A population database was generated from 118 unrelated Caucasoid individuals living in Spain. Sequence polymorphisms of the mitochondrial DNA (mtDNA) control region, hypervariable regions I and II (HVRI and HVRII) were determined using the polymerase chain reaction (PCR) and direct sequencing. A total of 102 different sequences were found as defined by 105 variable positions. The most common sequence occurred six times, and this sequence is also the most frequent in other European populations such as Austria, Germany and Britain. The mean pair-wise difference for the two HVR regions taken together was 7.74. The study revealed that transitions made up the majority of the variations (88%), whereas we observed a significantly lower frequency of transversions (8%). Also one individual in this study was observed with two positions of heteroplasmy at nucleotides 150 (C/T) and 153 (G/A). A statistical estimate of the results for this population showed a genetic diversity of 0.99. The probability of two random individuals showing identical mtDNA haplotypes is 1.3%. In order to use the mtDNA analysis in forensic casework, we consider that it is of crucial importance to know the frequency of the different sequences of mtDNA, and this data base study could be a useful tool to statistically evaluate the results.
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Affiliation(s)
- M Crespillo
- Sección de Biología, Instituto Nacional de Toxicología, Ministerio de Justicia, Merced 1, 08002 Barcelona, Spain.
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Blanco R, Chakraborty R, Barton SA, Carreño H, Paredes M, Jara L, Palomino H, Schull WJ. Evidence of a sex-dependent association between the MSX1 locus and nonsyndromic cleft lip with or without cleft palate in the Chilean population. Hum Biol 2001; 73:81-9. [PMID: 11332647 DOI: 10.1353/hub.2001.0002] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Prior studies have implicated an involvement of the Msx1 homeobox gene in cleft palate in mice and its homolog in humans (called MSX1 in the HOX7 gene, located on chromosome 4). In this study we present evidence of a sex-dependent association between MSX1 and non-syndromic cleft lip/palate (NSCLP) in the Chilean population. The sample included 73 NSCLP cases, 37 from multiplex families (Mx), 36 from simplex families (Sx), and 87 controls. Polymerase chain reaction amplification of the MSX1 intragenic microsatellite (CA)n-sequence shows significant (p = 0.035) differences in the allele frequencies between NSCLP-Mx males and control males. These differences are mainly due to frequency differences in allele *2 (173 base pairs) among cases (21.9%) and controls (13.2%). When the NSCLP cases are subdivided by sex and positive family history (Mx versus Sx), the Mx males (27.8%) as well as the total NSCLP-Mx cases (25.7%) showed significantly higher frequencies of allele *2, compared to controls (11.4% and 13.2%, respectively). Analysis of the genotype data indicates that the relative risk for NSCLP is greater for persons carrying allele *2 (i.e., odds ratio [OR] larger than 1), reaching significance for all Mx cases (OR = 2.67; 95% confidence interval [CI], 1.10 to 6.52) and even more pronounced for Mx males (OR = 3.33; 95% CI, 1.08 to 10.32). Taken together, these findings support the hypothesis that the genetic variation at the MSX1 locus is a predisposing gene involved in sex-dependent susceptibility to clefting and that it also differentiates simplex from multiplex families.
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Affiliation(s)
- R Blanco
- Institute of Biomedical Science, Human Genetics Program, School of Medicine, University of Chile, Santiago
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Suárez ME, Carvajal L, Culasso C, Paredes M. [Antimicrobial resistance of Shigella spp. in Córdoba, Argentina, during the period 1990-1997]. Rev Panam Salud Publica 2000; 7:113-7. [PMID: 10748662 DOI: 10.1590/s1020-49892000000200007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study analyzed the evolution of antimicrobial resistance in 771 isolates of Shigella spp. obtained from a total of 9,195 feces cultures done between 1990 and 1997 in a children's hospital in Córdoba, Argentina. S. flexneri, which was responsible for 73% of the Shigella infections, was the species with the greatest resistance. The frequency of S. flexneri resistance to the three antibiotics most used (ampicillin, trimethoprim-sulfamethoxazole, and chloramphenicol) increased from 10% in 1990 to 58% in 1997 (P < 0.001). Considering each of the drugs individually, the resistance to ampicillin increased from 60% to 100% (P < 0.001), the resistance to chloramphenicol from 13% to 71% (P < 0.001), and the resistance to trimethoprim-sulfamethoxazole from 79% to 84% (P = 0.22). For S. sonnei, the increase in resistance to ampicillin (from 36% in 1990 to 54% in 1997) was not statistically significant (P = 0.20), nor was the reduction in resistance to trimethoprim-sulfamethoxazole, which went from 82% in 1990 to 55% in 1997 (P = 0.08). Only two S. sonnei isolates were found that were resistant to chloramphenicol, one in 1995 and another in 1997; two S. sonnei isolates were found with resistance to all three antibiotics. We consider it essential to carry out susceptibility tests of each Shigella clinical isolate, to detect changes in the resistance profile and thus modify empiric treatment.
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Affiliation(s)
- M E Suárez
- Laboratorio de Bacteriología, Hospital de Niños, Córdoba, Argentina
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Paredes M, Carreño H, Solá JA, Segú J, Palomino H, Blanco R. [Association between nonsyndromic cleft lip/palate and microsatellite markers located in 4q]. Rev Med Chil 1999; 127:1431-8. [PMID: 10835749] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
BACKGROUND Nonsyndromic cleft lip with or without cleft palate (NSCLP) is a common craniofacial defect. Association studies have suggested that a clefting locus is located on chromosome 4q at or near two microsatellite markers D4S175 and D4S192. AIM To test the hypothesis on the possible presence of a clefting locus on chromosome 4q. MATERIAL AND METHODS We carried out an association study on a sample of unrelated NSCLP patients, of their unaffected relatives and in controls. Both probands and relatives were further analyzed depending if they originated from simplex or multiplex families. DNA was analyzed with two PCR markers close to the putative NSCLP locus, dinucleotide repeats D4S175 and D4S192. PCR products were resolved by PAGE and visualized by silver staining. Statistical analysis was performed by means of chi 2 log ratio. RESULTS Significant differences between NSCLP and controls were observed when comparing the allele frequency distribution of D4S192 both in the total sample as well as in NSCLP-multiplex and simplex cases. No significant differences for D4S175 were observed in any of the comparisons. Unaffected relatives showed significant differences with controls both for D4S175 and D4S192. CONCLUSIONS Our results support the hypothesis that a NSCLP locus maps on chromosome 4q close to the microsatellite marker D4S192. No differences were observed between NSCLP multiplex and simplex cases versus controls, implying that they do not represent different etiologic entities. The results of the present and previous studies in the same group of patients support the hypothesis that several major interacting genes participate in the etiology of NSCLP.
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Affiliation(s)
- M Paredes
- Escuela de Postgrado, Facultad de Medicina, Universidad de Chile
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Carreño H, Paredes M, Téllez G, Palomino H, Blanco R. [Association of non-syndromic cleft lip and cleft palate with microsatellite markers located in 6p]. Rev Med Chil 1999; 127:1189-98. [PMID: 10835735] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
BACKGROUND Nonsyndromic cleft lip with or without cleft palate (NSCLP) is a common craniofacial developmental defect. Association studies have suggested that a clefting locus is located on chromosome 6p at or near two possible loci, Factor 13A (FI3A) in the region 6p 25-24 and HLA at 6p 21.3. AIM To test the hypothesis on the possible presence of a major gene on chromosome 6p associated with NSCLP. PATIENTS AND METHODS We carried out an association study on a sample of unrelated NSCLP patients from multiplex (Mx) and simplex (Sx) families, of their unaffected relatives and in control individuals. DNA was analyzed with three PCR markers close to the putative NSCLP locus, dinucleotide repeats at loci D6S89, D6S109 and D6S105. PCR products were resolved by PAGE and visualized by silver staining. Statistical analysis was performed by means of chi 2 log ratio. RESULTS Significant differences were observed when comparing the allele frequency distribution of D6S89 in patients with NSCLP and controls and in patients with NSCLP-Mx and controls. No significant differences were observed for patients with NSCLP-Sx. D6S109 and D6S105 showed no significant differences in any of the comparisons. CONCLUSIONS Our results support the hypothesis that a NSCLP locus maps on 6p23 very close to D6S89. Results for D6S109 and D6S105 do not show a clear association. Differences observed between NSCLP-MX and Sx families seem to represent different etiologic entities. The results of the present study, plus those already published for candidate loci, TGFA and MSX1, support the hypothesis that several interacting major genes participate in the etiology of NSCLP.
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Affiliation(s)
- H Carreño
- Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile
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Lu Q, Paredes M, Medina M, Zhou J, Cavallo R, Peifer M, Orecchio L, Kosik KS. delta-catenin, an adhesive junction-associated protein which promotes cell scattering. J Cell Biol 1999; 144:519-32. [PMID: 9971746 PMCID: PMC2132907 DOI: 10.1083/jcb.144.3.519] [Citation(s) in RCA: 151] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/1998] [Revised: 12/22/1998] [Indexed: 12/02/2022] Open
Abstract
The classical adherens junction that holds epithelial cells together consists of a protein complex in which members of the cadherin family linked to various catenins are the principal components. delta-catenin is a mammalian brain protein in the Armadillo repeat superfamily with sequence similarity to the adherens junction protein p120(ctn). We found that delta-catenin can be immunoprecipitated as a complex with other components of the adherens junction, including cadherin and beta-catenin, from transfected cells and brain. The interaction with cadherin involves direct contact within the highly conserved juxtamembrane region of the COOH terminus, where p120(ctn) also binds. In developing mouse brain, staining with delta-catenin antibodies is prominent towards the apical boundary of the neuroepithelial cells in the ventricular zone. When transfected into Madin-Darby canine kidney (MDCK) epithelial cells delta-catenin colocalized with cadherin, p120(ctn), and beta-catenin. The Arm domain alone was sufficient for achieving localization and coimmunoprecipitation with cadherin. The ectopic expression of delta-catenin in MDCK cells altered their morphology, induced the elaboration of lamellipodia, interfered with monolayer formation, and increased scattering in response to hepatocyte growth factor treatment. We propose that delta-catenin can regulate adhesion molecules to implement the organization of large cellular arrays necessary for tissue morphogenesis.
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Affiliation(s)
- Q Lu
- Center for Neurologic Diseases, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
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Fleckenstein JF, Paredes M, Thuluvath PJ. A prospective, randomized, double-blind trial evaluating the efficacy of ursodeoxycholic acid in prevention of liver transplant rejection. Liver Transpl Surg 1998; 4:276-9. [PMID: 9649640 DOI: 10.1002/lt.500040412] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Acute cellular rejection (ACR) after orthotopic liver transplantation occurs in 50% to 80% of patients despite the recent advances in immunosuppressive therapy. Adjuvant use of ursodeoxycholic acid (UDCA) is theoretically attractive, but studies have shown conflicting results. In this randomized, controlled study, we evaluated the efficacy of UDCA in reduction of the incidence of ACR. Thirty patients were randomized to receive either UDCA (15 mg/kg) or placebo in addition to the standard triple-drug regimen; 14 patients received UDCA, and the rest received placebo, for 3 to 6 months. The diagnosis of ACR was based on histologic criteria. Three patients withdrew from the study within 1 month of therapy, all because of capsule size. There was no difference in the total incidence of ACR between the placebo and UDCA groups, with 12 and 11 episodes within 6 months, respectively; the overall incidence of rejection was 77%. There were also no differences in the incidence of recurrent rejection, in the number of rejection episodes occurring after 5 days of therapy, or in the use of OKT3. There was no difference in 1-year survival between groups. This study shows that adjuvant therapy with UDCA in addition to standard triple-drug immunosuppressive therapy does not reduce the incidence of ACR.
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Affiliation(s)
- J F Fleckenstein
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
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Lu Q, Paredes M, Zhang J, Kosik KS. Basal extracellular signal-regulated kinase activity modulates cell-cell and cell-matrix interactions. Mol Cell Biol 1998; 18:3257-65. [PMID: 9584166 PMCID: PMC108907 DOI: 10.1128/mcb.18.6.3257] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Suppression of the basal extracellular signal-regulated kinase (ERK) activity in PC12 cells markedly altered their phenotype. Wild-type cells grew in a dissociated pattern adherent to the substrate. The stable expression of an ERK inhibitory mutant resulted in the formation of calcium-dependent aggregates which were less adherent to the substrate. Concomitantly, the cells reorganized their actin cytoskeleton and increased their expression of several adherens junction proteins, particularly cadherin. Metabolic labeling demonstrated an increased synthesis of cadherin and beta-catenin in these cells. Nontransfected PC12 cells and a ras-transformed MDCK cell line also formed aggregates and increased their expression of adherens junction proteins following treatment with the selective MEK inhibitor PD98059. A peptide containing the HAV cadherin recognition sequence attenuated the aggregation. These studies suggest that in PC12 and epithelial cells, ERKs are pivotally positioned to enhance substrate interactions when active or to release homotypic interactions when suppressed.
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Affiliation(s)
- Q Lu
- Center for Neurologic Diseases, Brigham and Women's Hospital, Boston, MA 02115, USA
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Murga H, Guevara G, Huicho L, Paredes M, Sánchez D, Contreras M. Differential clinical and epidemiological features in children with Campylobacter diarrhoea, mixed-agent diarrhoea and Campylobacter diarrhoea plus parenteral infections. J Trop Pediatr 1995; 41:57-9. [PMID: 7723135 DOI: 10.1093/tropej/41.1.57] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A prospective study of 111 young Peruvian children with Campylobacter jejuni diarrhoea showed that it behaves as an endemic enterotoxigenic-like, waterborne, milkborne, and zoonotic disease. Although there were no definite differential features between pure C. jejuni diarrhoea, mixed-agent diarrhoea, and C. jejuni diarrhoea plus parenteral infections, children with C. jejuni diarrhoea plus parenteral infections were all inpatients, were more frequently malnourished and more frequently exhibited systemic symptoms. Campylobacter jejuni associated with other enteric pathogens did not seem to act synergistically as the disease was not particularly severe in this group.
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Affiliation(s)
- H Murga
- Universidad Nacional Mayor de San Marcos, Lima, Peru
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Huicho L, Guevara G, Olivares N, Paredes M. Clinical and laboratory features in Peruvian infants with urinary tract infection. J Trop Pediatr 1994; 40:122. [PMID: 8015030 DOI: 10.1093/tropej/40.2.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 01/28/2023]
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Zamorano CG, Contreras M C, Espinoza A, Paredes M, Sandoval L, Schulz E, Castillo J. [Trichinosis outbreak in Purranque County, X Region, Chile. October-November, 1992]. Bol Chil Parasitol 1994; 49:38-42. [PMID: 7632339] [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: 01/26/2023]
Abstract
An outbreak of trichinosis occurred in Purranque County, X Region, Chile, between october and november of 1992, which involved 36 persons. The incubation period, determined by the clinical picture and laboratory assays, fluctuated between 10 and 12 days. Myalgias (88.9%) and palpebral oedema (86.1%), were the most important symptoms, followed by fever (44.4%) and headache (33.3%). Eosinophils count ranged from two to 42% the first week, and this value raised to 55% the second week of the outbreak. Anti-Trichinella spiralis antibodies were determined by some serological tests such as: precipitin test (PT), bentonite flocculation test (BFT) and indirect hemagglutination test (IHAT) in sera from 28 patients at the beginning of the outbreak. PT was positive in 46.4% of the cases, followed by IHAT (21.4%) and BFT (3.6%). After 15 days, the three tests were performed in sera from 12 patients. At that time, the positivity was elevated in all of them: PT (100.0%), BFT (66.7%) and IHAT (91.7%). It is believed that the outbreak had its origin in infected pork meat that was consumed raw or insufficiently cooked without a previous veterinary inspection.
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Affiliation(s)
- C G Zamorano
- Servicio de Salud Osorno, X Región Chile, Facultad de Medicina, Universidad de Chile, Santiago
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Huicho L, Sanchez D, Contreras M, Paredes M, Murga H, Chinchay L, Guevara G. Occult blood and fecal leukocytes as screening tests in childhood infectious diarrhea: an old problem revisited. Pediatr Infect Dis J 1993; 12:474-7. [PMID: 8345979 DOI: 10.1097/00006454-199306000-00004] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
During a 24-month period 446 children with diarrhea and 16 controls had examination of their stools for leukocytes and for occult blood. Fecal leukocytes were found in 36, 16 and 18% of children with Salmonella-Shigella-Campylobacter, rotavirus or enterotoxigenic Escherichia coli, or cryptosporidial diarrhea, respectively. Similarly 43, 39 and 38% of these groups, respectively, as well as 13% of controls had occult blood. Notably 70% of 10 Shigella cases had fecal leukocytes. In 166 children with mixed pathogens leukocytes were seen in 27 and 8% of children with Salmonella-Shigella-Campylobacter or noninvasive pathogen, respectively. Likewise 44 and 18% of these groups had occult blood. Agreement between both tests being positive was poor, the highest result being 50% for Shigella. Dysentery combined with both tests positive was associated with 15 (88%) cases of invasive agents present in stool cultures, and combination of dysentery with fecal leukocytes was associated with 21 (72%) cases of invasive agents recovered. The results of these tests should be interpreted in the context of the clinical situation. A combined clinical-epidemiologic and screening tests-based approach to infectious diarrhea of childhood is suggested.
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Affiliation(s)
- L Huicho
- Universidad Nacional Mayor de San Marcos, Lima, Peru
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Paredes M, García C, Cabezas H. [Clinico-bacteriological information regarding the first case of cholera in Chile]. Rev Med Chil 1991; 119:1209. [PMID: 1845217] [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: 12/29/2022]
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Abstract
When different bloodstains are encountered at the scene of crime, it is possible to discriminate those from a pregnant woman from others. Human chorionic gonadotrophin, human placental lactogen, total oestriol and progesterone in the stains may be determined with radioimmunoassay techniques using commercial kits. Only 1 cm2 of bloodstain is needed for the determination of all four parameters, which gives information about the state of pregnancy. More than 100 stains of blood from women in all stages of pregnancy, normal menstruating women, menopausal and post-menopausal women and male subjects, and of menstrual blood were analysed. Bloodstains from pregnant women were easy to evaluate with the four determinations, only very early pregnancies being undetected. Stains from non-pregnant women were negative or below the cut-off level. Two case examples are also described.
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Affiliation(s)
- G Vergote
- Department of Toxicology and Criminalistics, State University of Ghent, Belgium
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Varea J, Paredes M, Garces G, Ochoa C, Avila C, Coloma MJ, Briones R, Comaru-Schally AM, Schally AV. Effect of Somatostatin on TSH levels in non-toxic sporadic goiter. Horm Metab Res 1990; 22:627-31. [PMID: 1981767 DOI: 10.1055/s-2007-1004989] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Somatostatin (SS-14; growth hormone-release inhibiting hormone) was infused into eight patients with non-toxic sporadic goiter and into eleven normal control subjects. Each patient was given 150 microgram(s) of somatostatin as an intravenous bolus and 350 microgram(s) by infusion over a period of 60 minutes. Somatostatin did not lower the basal TSH levels as compared to the pre-infusion levels in this type of goiter, but produced a decrease in the TSH response to TRH during and after the infusion.
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Affiliation(s)
- J Varea
- Endocrine Service, Carlos Andrade Marin Hospital, Ecuadorian Social Security Institute, Quito
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López I, Vargas S, Alarcón M, Beltrán M, Chávez MG, González F, Guillón I, Paredes M, Ruiz AM, Montecinos J. [Structure of the consultations for pediatric and adult illnesses in the offices of the Northwestern Metropolitan health Service (1980-1981)]. Rev Med Chil 1983; 111:727-37. [PMID: 6440254] [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: 01/20/2023]
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Abstract
Twelve patients with bilateral symptomatic lesions of internal carotid arteries have had bilateral carotid endarterectomy at single operations without complications. These were patients up to age 80 who had prior mycardial infarction, stroke with recovery, and hemispheric and nonhemispheric episodes. Neurologist's clearance and three- or four-vessel intracranial-extracranial angiography preceded all operations, which were performed with the patient under general anesthesia. Stump pressure measurements were the principal guideline of adequacy of collateral flow and predictor of safe outcome. The safety of this concept of bilateral operations during one anesthesia can eliminate uncertainties of sequence and timing, obviate delay and indecision, and avoid the hazards of a second anesthetic-operative experience.
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Paredes L, Paredes M. [The in vitro sensitivity of 24 strains of pseudomonas pseudomallei to antibiotics (author's transl)]. Rev Med Chil 1976; 104:538-40. [PMID: 1021818] [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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Paredes L, Fernández M, Paredes M, Fuenzalida P, Paredes L. [Serratia marcescens infections. Bacteriological study, antibiogram, and clinical significance]. Rev Med Chil 1974; 102:109-17. [PMID: 4157414] [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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