1
|
Salazar S, Castillo LA, Montes L. Definition of unconformities based on radiometric tool. Appl Radiat Isot 2023; 199:110872. [PMID: 37290270 DOI: 10.1016/j.apradiso.2023.110872] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/22/2023] [Accepted: 05/24/2023] [Indexed: 06/10/2023]
Abstract
The concentrations of U-238, Th-232, and K-40 measured with a portable gamma-ray spectrometer in cutting samples of two exploratory wells allowed the radiometric characterization of Cretaceous Rancheria sub-basin rocks and the definition of twelve (12) zones according to paleo-redox facies. The Th/Ua (authigenic uranium) and Th/U ratio greater than 7 (seven) indicates paleo-redox conditions related to oxygenation changes and detrital material input during deposition and terrestrial freshwater environment. However, the Lagunitas, Aguas Blancas, La Luna, and Molino formations characterize by facies from sub-oxic (dioxic) to anoxic redox. In the Aguas Blancas and Molino Formations, pyrite and the high uranium measurements determine an anoxic and euxinic environment. The high values of both + uranium and authigenic uranium in the La Luna and Molino formations relate to the conservation of organic matter, which is an essential factor in the generation of hydrocarbons. The abrupt changes of both K/U and Th/U identify potential sequential or genetic limit surfaces (e.g., maximum flooding surfaces), limiting such zones. Based on radiometric behavior, this research permitted identifying eight Cretaceous to Miocene unconformities in the area, three of them reported here for the first time.
Collapse
Affiliation(s)
| | - L A Castillo
- Universidade Federal Do Amazonas, Instituto de Ciências Exatas, Departamento de Geociências, Manaus Amazonas, Brazil.
| | - L Montes
- Universidad Nacional de Colombia-Sede Bogotá, Facultad de Ciencias, Departamento de Geociencias, Colombia.
| |
Collapse
|
2
|
Escobar MF, Gallego JC, Echavarria MP, Fernandez P, Posada L, Salazar S, Gutierrez I, Alarcon J. Maternal and perinatal outcomes in mixed antenatal care modality implementing telemedicine in the southwestern region of Colombia during the COVID-19 pandemic. BMC Health Serv Res 2023; 23:259. [PMID: 36922841 PMCID: PMC10017345 DOI: 10.1186/s12913-023-09255-4] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 03/07/2023] [Indexed: 03/18/2023] Open
Abstract
INTRODUCTION Contingency measures due to the COVID-19 pandemic limited access to routine prenatal care for pregnant women, increasing the risk of pregnancy complications due to poor prenatal follow-up, especially in those patients at high obstetric risk. This prompted the implementation and adaptation of telemedicine. OBJECTIVE We aim to evaluate the maternal and perinatal outcomes of patients who received prenatal care in-person and by telemedicine. METHODS We conducted a retrospective observational cohort study of pregnant women who received exclusive in-person and alternate (telemedicine and in-person) care from March to December 20,202, determining each group's maternal and neonatal outcomes. RESULTS A total of 1078 patients were included, 156 in the mixed group and 922 in the in-person group. The patients in the mixed group had a higher number of prenatal controls (8 (6-9) vs 6 (4-8) p < 0.001), with an earlier gestational age at onset (7.1 (6-8.5) vs 9.3 (6.6-20.3), p < 0.001), however, they required a longer hospital stay (26 (16,67%) vs 86 (9,33%), p = 0.002) compared to those attended in-person; there were no significant differences in the development of obstetric emergencies, maternal death or neonatal complications. DISCUSSION Incorporating telemedicine mixed with in-person care could be considered as an alternative for antenatal follow-up of pregnant women in low- and middle-income countries with barriers to timely and quality health care access.
Collapse
Affiliation(s)
- María Fernanda Escobar
- High Complexity Obstetric Unit, Department of Obstetrics and Gynecology, Fundación Valle del Lili, Cra 98 Nro.18-49, 7600.2, Cali, Colombia. .,Department of Obstetrics and Gynecology, School of Medicine, Universidad Icesi, Cali, Colombia. .,Department of Telemedicine, Fundación Valle del Lili, Cali, Colombia.
| | - Juan Carlos Gallego
- High Complexity Obstetric Unit, Department of Obstetrics and Gynecology, Fundación Valle del Lili, Cra 98 Nro.18-49, 7600.2, Cali, Colombia.,Department of Obstetrics and Gynecology, School of Medicine, Universidad Icesi, Cali, Colombia
| | - María Paula Echavarria
- High Complexity Obstetric Unit, Department of Obstetrics and Gynecology, Fundación Valle del Lili, Cra 98 Nro.18-49, 7600.2, Cali, Colombia.,Department of Obstetrics and Gynecology, School of Medicine, Universidad Icesi, Cali, Colombia
| | - Paula Fernandez
- Department of Obstetrics and Gynecology, School of Medicine, Universidad Icesi, Cali, Colombia
| | - Leandro Posada
- Department of Obstetrics and Gynecology, School of Medicine, Universidad Icesi, Cali, Colombia
| | - Shirley Salazar
- Department of Obstetrics and Gynecology, School of Medicine, Universidad Icesi, Cali, Colombia
| | - Isabella Gutierrez
- Department of Obstetrics and Gynecology, School of Medicine, Universidad Icesi, Cali, Colombia
| | - Juliana Alarcon
- Centro de Investigaciones Clínicas, Fundación Valle del Lili, Cali, Colombia
| |
Collapse
|
3
|
Khan R, Nijhawan A, Shick C, Salazar S, Pourmoussa A, Saxena A, Hasan M, Schiro B. Abstract No. 181 Evaluation of Carotid Artery Stenosis Using 3D/4D Vessel Cast. J Vasc Interv Radiol 2023. [DOI: 10.1016/j.jvir.2022.12.238] [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: 02/26/2023] Open
|
4
|
Salazar S, Vengalasetti Y, Kilbridge M, Gurusamy V, Powell A, Schiro B, Peña C, Gandhi R, Niekamp A. Abstract No. 206 Intravascular Lithotripsy in the Treatment of Critical Limb Ischemia: A Single-Center Retrospective Study. J Vasc Interv Radiol 2023. [DOI: 10.1016/j.jvir.2022.12.265] [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: 02/26/2023] Open
|
5
|
Nijhawan A, Pourmoussa A, Ducaud C, Fox B, Salazar S, Lugo C, Hasan M, Benenati J, Schiro B. Abstract No. 370 Single center retrospective study on the efficacy of contrast enhanced ultrasound for detection of endoleak after endovascular aortic repair. J Vasc Interv Radiol 2022. [DOI: 10.1016/j.jvir.2022.03.451] [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] Open
|
6
|
Salazar S, Castillo LA, Montes L. Evaluation of naturally occurring radioactive materials (NORM) in the soil, in a potential area for unconventional reservoirs in the Rancheria Sub-Basin. Chemosphere 2021; 283:131098. [PMID: 34144289 DOI: 10.1016/j.chemosphere.2021.131098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 05/24/2021] [Accepted: 05/29/2021] [Indexed: 06/12/2023]
Abstract
Naturally occurring radioactive elements depend on lithology geogenic characteristics, such as depositional, environmental, or diagenetic. Thus, evaluating these elements constitutes a tool to define ionizing radiation effect from rocky sequences. This study carried out in the Rancheria Sub-Basin establishes both characterization and assessment of this kind of material, known as NORM. The sampling included uranium-238, thorium-232, potassium-40, radon-226, and radon-222 in soil samples, cutting samples from the Molino-1 well, and radon in surface water. Bases on a radiometric methodology with a gamma-ray spectrometer for uranium-238, thorium-232, and potassium-40 and emanometric with ionizing chambers for radio-226 and radon-222. The analysis and results of the activity concentrations in soil samples of U-238, Th-232, K-40, and Ra-226 are 11.7 BqKg-1, 33.0 BqKg-1, 424.5 BqKg-1, and 15.59 BqKg-1, respectively, among the acceptable global averages. However, in some areas, observed values indicate high activity concentrations of U-238, Th-232, K-40, Ra-226, and Rn-222 in the soil of 50.2 BqKg-1, 62.8 BqKg-1, 1596.3 BqKg-1, 44.25 BqKg-1, and 112546.79 Bqm-3, respectively. Those activity concentrations were associated with zone lithology.
Collapse
Affiliation(s)
| | - L A Castillo
- Universidade Federal do Amazonas, Instituto de Ciências Exatas, Departamento de Geociências, Manaus Amazonas, Brazil.
| | - L Montes
- Universidad Nacional de Colombia-Sede Bogotá. Facultad de Ciencias, Departamento de Geociencias, Colombia.
| |
Collapse
|
7
|
Salazar S, Gutiérrez N, Sánchez O, Ramos E, González A, Acosta J, Ramos T, Altamirano C, Toledo J, Montesino R. Establishment of a production process for a novel vaccine candidate against Lawsonia intracellularis. ELECTRON J BIOTECHN 2021. [DOI: 10.1016/j.ejbt.2021.01.002] [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: 11/26/2022] Open
|
8
|
Magaña J, Contreras MG, Keys KL, Risse-Adams O, Goddard PC, Zeiger AM, Mak ACY, Elhawary JR, Samedy-Bates LA, Lee E, Thakur N, Hu D, Eng C, Salazar S, Huntsman S, Hu T, Burchard EG, White MJ. An epistatic interaction between pre-natal smoke exposure and socioeconomic status has a significant impact on bronchodilator drug response in African American youth with asthma. BioData Min 2020; 13:7. [PMID: 32636926 PMCID: PMC7333373 DOI: 10.1186/s13040-020-00218-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 06/23/2020] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Asthma is one of the leading chronic illnesses among children in the United States. Asthma prevalence is higher among African Americans (11.2%) compared to European Americans (7.7%). Bronchodilator medications are part of the first-line therapy, and the rescue medication, for acute asthma symptoms. Bronchodilator drug response (BDR) varies substantially among different racial/ethnic groups. Asthma prevalence in African Americans is only 3.5% higher than that of European Americans, however, asthma mortality among African Americans is four times that of European Americans; variation in BDR may play an important role in explaining this health disparity. To improve our understanding of disparate health outcomes in complex phenotypes such as BDR, it is important to consider interactions between environmental and biological variables. RESULTS We evaluated the impact of pairwise and three-variable interactions between environmental, social, and biological variables on BDR in 233 African American youth with asthma using Visualization of Statistical Epistasis Networks (ViSEN). ViSEN is a non-parametric entropy-based approach able to quantify interaction effects using an information-theory metric known as Information Gain (IG). We performed analyses in the full dataset and in sex-stratified subsets. Our analyses identified several interaction models significantly, and suggestively, associated with BDR. The strongest interaction significantly associated with BDR was a pairwise interaction between pre-natal smoke exposure and socioeconomic status (full dataset IG: 2.78%, p = 0.001; female IG: 7.27%, p = 0.004)). Sex-stratified analyses yielded divergent results for females and males, indicating the presence of sex-specific effects. CONCLUSIONS Our study identified novel interaction effects significantly, and suggestively, associated with BDR in African American children with asthma. Notably, we found that all of the interactions identified by ViSEN were "pure" interaction effects, in that they were not the result of strong main effects on BDR, highlighting the complexity of the network of biological and environmental factors impacting this phenotype. Several associations uncovered by ViSEN would not have been detected using regression-based methods, thus emphasizing the importance of employing statistical methods optimized to detect both additive and non-additive interaction effects when studying complex phenotypes such as BDR. The information gained in this study increases our understanding and appreciation of the complex nature of the interactions between environmental and health-related factors that influence BDR and will be invaluable to biomedical researchers designing future studies.
Collapse
Affiliation(s)
- J. Magaña
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
| | - M. G. Contreras
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
- Department of Biology, San Francisco State University, San Francisco, CA USA
| | - K. L. Keys
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
- Berkeley Institute for Data Science, University of California, Berkeley, CA USA
| | - O. Risse-Adams
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
- Lowell Science Research Program, Lowell High School, San Francisco, CA USA
- Department of Biology, University of California, Santa Cruz, CA USA
| | - P. C. Goddard
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
- Department of Genetics, Stanford University, Stanford, CA USA
| | - A. M. Zeiger
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
- Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA USA
| | - A. C. Y. Mak
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
| | - J. R. Elhawary
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
| | - L. A. Samedy-Bates
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, CA USA
| | - E. Lee
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
| | - N. Thakur
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
| | - D. Hu
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
| | - C. Eng
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
| | - S. Salazar
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
| | - S. Huntsman
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
| | - T. Hu
- School of Computing, Queen’s University, Kingston, ON Canada
| | - E. G. Burchard
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, CA USA
| | - M. J. White
- Department of Medicine, University of California, 1550 4th Street, UCSF Rock Hall, Box 2911, San Francisco, CA 94158 USA
| |
Collapse
|
9
|
Gibson B, Sanguinetti J, Mullins T, Salazar S, Buchman L, Cutter C, Klein E, Aragon D, Heinrich M, Badran B, Yu A, Clark V. Excitability changes induced in the motor cortex by transcranial ultrasound stimulation. Brain Stimul 2019. [DOI: 10.1016/j.brs.2018.12.530] [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: 11/26/2022] Open
|
10
|
Muñoz-Mediavilla C, Cámara JA, Salazar S, Segui B, Sanguino D, Mulero F, de la Cueva E, Blanco I. Evaluation of the foetal time to death in mice after application of direct and indirect euthanasia methods. Lab Anim 2015; 50:100-7. [PMID: 26265244 DOI: 10.1177/0023677215600626] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Directive 2010/63/EU on the protection of animals used for scientific purposes requires that the killing of mammal foetuses during the last third of their gestational period should be accomplished through effective and humane methods. The fact that murine foetuses are resistant to hypoxia-mediated euthanasia renders the current euthanasia methods ineffective or humane for the foetuses when these methods are applied to pregnant female mice. We have assessed the time to death of foetuses after performing either indirect (dam euthanasia) or direct (via intraplacental injection--a new approach to euthanasia) euthanasia methods in order to determine a euthanasia method that is appropriate, ethical and efficient for the killing of mouse foetuses. The respective times to death of foetuses after performing the three most commonly used euthanasia methods (namely cervical dislocation, CO2inhalation and intraperitoneal sodium pentobarbital administration) were recorded. Absence of foetal heartbeat was monitored via ultrasound. We consider that the most effective and humane method of foetal euthanasia was the one able to achieve foetal death within the shortest possible period of time. Among the indirect euthanasia methods assessed, the administration of a sodium pentobarbital overdose to pregnant female mice was found to be the fastest for foetuses, with an average post-treatment foetal death of approximately 29.8 min. As for the direct euthanasia method assessed, foetal time to death after intraplacental injection of sodium pentobarbital was approximately 14 min. Significant differences among the different mouse strains employed were found. Based on the results obtained in our study, we consider that the administration of a sodium pentobarbital overdose by intraplacental injection to be an effective euthanasia method for murine foetuses.
Collapse
Affiliation(s)
- C Muñoz-Mediavilla
- Charles River Laboratories, Animal Facility Unit, Spanish National Cancer Research Centre - CNIO, Spain
| | - J A Cámara
- Molecular Imaging Unit, Spanish National Cancer Research Centre - CNIO, Spain
| | - S Salazar
- Charles River Laboratories, Animal Facility Unit, Spanish National Cancer Research Centre - CNIO, Spain
| | - B Segui
- Charles River Laboratories, Animal Facility Unit, Spanish National Cancer Research Centre - CNIO, Spain
| | - D Sanguino
- Animal Facility Unit, Spanish National Cancer Research Centre - CNIO, Spain
| | - F Mulero
- Molecular Imaging Unit, Spanish National Cancer Research Centre - CNIO, Spain
| | | | - I Blanco
- Charles River Laboratories, Animal Facility Unit, Spanish National Cancer Research Centre - CNIO, Spain
| |
Collapse
|
11
|
Lopéz R, Gonzalez I, Flores J, Ordaz J, Salazar S, Lozano R. Real Time Parameter Identification of the Inertia Tensor for a Quad-rotor mini-aircraft using Adaptive Control*. ACTA ACUST UNITED AC 2013. [DOI: 10.3182/20131120-3-fr-4045.00040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
12
|
|
13
|
Jimenez J, Franco S, Salazar S, Amigo M, Gracia E, Fuentes A, Guillen N, Gárciga A, Quintero S, Guarnaluce R. PO47 The introduction of immunohistochemistry for the diagnosis of lymphomas at the Pathology Department of the National Institute of Oncology, Cuba. Crit Rev Oncol Hematol 2012. [DOI: 10.1016/s1040-8428(12)70060-4] [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: 10/28/2022] Open
|
14
|
Abstract
STUDY DESIGN Literature review. OBJECTIVES Critical review of the literature published on the physiological alterations caused by spinal cord injury (SCI) and their effect on the pharmacokinetic parameters of commonly employed drugs. The review introduces the most recent treatment protocols of a variety of drugs, enabling the modern clinician to apply efficacious and cost-effective solutions to the pharmacological treatment of SCI patients. METHODS Studies published in international indexed journals up to January 2011 were selected from the PubMed database. RESULTS The review evaluated the sequelae of SCI and their effect on pharmacological processes. The results demonstrated that these alterations affected the pharmacokinetics of drugs commonly administered to SCI patients, such as antibiotics, muscle relaxants, immunosuppressants and analgesics. CONCLUSION There are multiple etiologies to SCI and patients present with varying degrees of impairment. Factors such as level of injury and completeness of the injury create a very heterogeneous population within the SCI community. The heterogeneity of this population creates a problem when trying to standardize pharmacokinetic (PK) parameters. It is because of this that specific physiological alterations must be linked to changes in PK and be identified within the clinical setting. This relationship between physiology and PK enables the clinician to be alert for possible pharmacological complications in individual patients based on their clinical manifestations. Future research should aim to develop rigorous therapeutic guidelines tailored to the diverse manifestations of SCI so as to provide effective, affordable and safe pharmacotherapy.
Collapse
Affiliation(s)
- H Mestre
- Facultad de Ciencias de la Salud, Universidad Anáhuac México Norte, Huixquilucan Edo. de México, México
| | | | | | | |
Collapse
|
15
|
|
16
|
Alvarez L, Macias R, Pavón N, López G, Rodríguez-Oroz MC, Rodríguez R, Alvarez M, Pedroso I, Teijeiro J, Fernández R, Casabona E, Salazar S, Maragoto C, Carballo M, García I, Guridi J, Juncos JL, DeLong MR, Obeso JA. Therapeutic efficacy of unilateral subthalamotomy in Parkinson's disease: results in 89 patients followed for up to 36 months. J Neurol Neurosurg Psychiatry 2009; 80:979-85. [PMID: 19204026 DOI: 10.1136/jnnp.2008.154948] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Stereotactic thermocoagulative lesions of the subthalamic nucleus (STN) have been shown to induce significant motor improvement in patients with Parkinson's disease (PD). PATIENTS AND METHODS 89 patients with PD were treated with unilateral subthalamotomy. 68 patients were available for evaluations after 12 months, 36 at 24 months and 25 at 36 months. RESULTS The Unified Parkinson's Disease Rating Scale (UPDRS) motor scores improved significantly contralaterally to the lesion in the "off" and "on" states throughout the follow-up, except for the "on" state at the last evaluation. Axial features and signs ipsilateral to the lesion progressed steadily throughout the study. Levodopa daily doses were significantly reduced by 45%, 36% and 28% at 12, 24 and 36 months post-surgery. 14 patients (15%) developed postoperative hemichorea-ballism which required pallidotomy in eight. These 14 patients had significantly higher dyskinesia scores (levodopa induced) preoperatively than the entire cohort. CONCLUSION Unilateral subthalamotomy was associated with significant and sustained motor benefit contralateral to the lesion. Further work is needed to ascertain what factors led to severe, persistent chorea-ballism in a subset of patients. Subthalamotomy may be considered an option in circumstances when deep brain stimulation is not viable.
Collapse
Affiliation(s)
- L Alvarez
- Movement Disorders, Functional Neurosurgery and Neurophysiology Units, Centro Internacional de Restauración Neurológica (CIREN), La Habana, Cuba
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
|
18
|
Valverde A, Peix A, Rivas R, Velazquez E, Salazar S, Santa-Regina I, Rodriguez-Barrueco C, Igual JM. Paenibacillus castaneae sp. nov., isolated from the phyllosphere of Castanea sativa Miller. Int J Syst Evol Microbiol 2008; 58:2560-4. [DOI: 10.1099/ijs.0.65663-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|
19
|
Valverde A, Igual J, Santa Regina I, Salazar S, Rodriguez-Barrueco C. PRELIMINARY DIVERSITY STUDIES OF CULTURABLE PHYLLOSPHERE BACTERIA ON CHESTNUT (CASTANEA SATIVA). ACTA ACUST UNITED AC 2005. [DOI: 10.17660/actahortic.2005.693.32] [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: 11/17/2022]
|
20
|
Meza Y, Williams E, Salazar S, Fasano C. Study Title: Accuracy of Immunization Histories Given by Adults Accompanying Children 3-36 Months to the Emergency Department: Are They Reliable. Ann Emerg Med 2005. [DOI: 10.1016/j.annemergmed.2005.06.059] [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: 10/23/2022]
|
21
|
Farina JM, Salazar S, Wallem KP, Witman JD, Ellis JC. Nutrient exchanges between marine and terrestrial ecosystems: the case of the Galapagos sea lion Zalophus wollebaecki. J Anim Ecol 2003. [DOI: 10.1046/j.1365-2656.2003.00760.x] [Citation(s) in RCA: 50] [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: 11/20/2022]
|
22
|
Gagné F, Blaise C, Salazar M, Salazar S, Hansen PD. Evaluation of estrogenic effects of municipal effluents to the freshwater mussel Elliptio complanata. Comp Biochem Physiol C Toxicol Pharmacol 2001; 128:213-25. [PMID: 11239834 DOI: 10.1016/s1532-0456(00)00189-7] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [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: 11/24/2022]
Abstract
Municipal effluents are an important source of estrogens to the aquatic environment. The purpose of this study was to examine the estrogenicity of municipal effluents to the indigenous freshwater mussel, Elliptio complanata. First, estradiol-binding sites in gonad homogenates were characterized to determine the binding affinity and specificity of estrogens. Mussels were exposed to increasing concentrations of a municipal effluent for 96 h at 15 degrees C. In another experiment, mussels were placed in cages and submerged for 62 days at 1.5 km upstream and 5 km downstream of a municipal effluent plume in the St. Lawrence River. Mussels were harvested for assessment of vitellogenin-like proteins in the hemolymph and determination of total lipid, carbohydrate and protein in the gonad. The presence of specific estrogen-binding sites was found in both male and female gonads. Binding of estradiol to cytosol proteins reached saturation, yielding a dissociation constant of 0.4 nM. Vitellogenin (Vg) levels increased significantly in both the hemolymph and the gonad after exposure to the effluent. Moreover, females appeared to be more sensitive than males to producing Vg. Mussels exposed in situ to contaminated surface waters had higher levels of Vg at the downstream site, again, females had higher levels of Vg than did males. On the other hand, lipid and sugar levels in male gonads were significantly increased at the downstream site. Moreover, mussels at the downstream site had decreased shell growth length and increased total and soft tissue weights. We conclude that municipal effluents contain bio-available xenoestrogens at levels sufficient to elicit effects in freshwater mussels.
Collapse
Affiliation(s)
- F Gagné
- St. Lawrence Centre, 105 McGill Street, 7th Floor, Montreal, Quebec H2Y-2E7, Canada.
| | | | | | | | | |
Collapse
|
23
|
Abstract
Marker chromosomes present a problem in genetic counseling because there are often no clear phenotype-karyotype correlations. We present the clinical findings in a patient who is mosaic for a supernumerary marker chromosome 20 determined by fluorescence in situ hybridization (FISH) and compare these findings to others reported in the literature.
Collapse
Affiliation(s)
- E D Austin-Ward
- Servicio de Genética, Departamento de Medicina, Hospital Clínico Universidad de Chile, Santiago, Chile.
| | | | | | | | | | | |
Collapse
|
24
|
Brundula V, Rivas LJ, Blasini AM, París M, Salazar S, Stekman IL, Rodríguez MA. Diminished levels of T cell receptor zeta chains in peripheral blood T lymphocytes from patients with systemic lupus erythematosus. Arthritis Rheum 1999; 42:1908-16. [PMID: 10513807 DOI: 10.1002/1529-0131(199909)42:9<1908::aid-anr17>3.0.co;2-7] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
OBJECTIVE To examine the expression of molecules known to participate in early T cell receptor (TCR)/CD3 signaling in peripheral blood (PB) T lymphocytes from patients with systemic lupus erythematosus (SLE). METHODS Signaling molecules were analyzed by immunoprecipitation and Western blotting of unstimulated PB T lymphocyte cell lysates from SLE patients, non-SLE disease controls, and healthy controls. Flow cytometry was used for analysis of the expression of membrane markers in intact cells. RESULTS PB T lymphocytes from SLE patients showed diminished levels of TCRzeta chains. This was not due to trapping of these molecules in the cytoskeleton, nor was it dependent on the presence of monocyte/macrophages. There was normal expression of CD3epsilon chains and normal assembly of TCR/CD3 complexes in membranes. We observed a lack of expression of TCRzeta chains in in vitro cultures of SLE T cells, and reversal of the defective expression in some patients by culturing T cells in the presence of NH4Cl. CONCLUSION Blood lymphocytes from SLE patients have a diminished expression of TCRzeta chains that may be related to enhanced degradation in the lysosomal compartment. The defective expression of these molecules may alter signal transduction via the CD3 pathway and contribute to abnormal T cell responses in T lymphocytes from SLE patients.
Collapse
Affiliation(s)
- V Brundula
- Centro Nacional de Enfermedades Reumáticas, Hospital Universitario de Caracas, Venezuela
| | | | | | | | | | | | | |
Collapse
|
25
|
Burkhart MC, de Mazariegos L, Salazar S, Hess T. Incidence of irregular cycles among Mayan women who reported having regular cycles: implications for fertility awareness methods. Contraception 1999; 59:271-5. [PMID: 10457873 DOI: 10.1016/s0010-7824(99)00030-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [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] [Indexed: 11/21/2022]
Abstract
Despite the low contraceptive prevalence among the Mayan population of Guatemala, past research has found interest in natural methods. A calendar rhythm method with a simple blanket rule would appear to be preferable to more complicated methods. Under a blanket rule, the number of days of abstinence is predetermined and all couples are instructed to abstain during the same interval of the menstrual cycle. However, regular menstrual cycles may be key to successful practice of a calendar method. A database of 880 cycles of 301 women of the Guatemalan highlands was analyzed to determine the length and regularity of menstrual cycles in this population.
Collapse
Affiliation(s)
- M C Burkhart
- Population Council, New York, New York 10017, USA.
| | | | | | | |
Collapse
|
26
|
Cuesta T, Estupiñán B, Salazar S, Carballosa E. [Neurofibroma with mucus-producing glands. Report of a case and literature review]. Rev Neurol 1999; 28:245-7. [PMID: 10714288] [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: 02/15/2023]
Abstract
INTRODUCTION Most tumors of peripheral nerve sheaths containing glands are malignant tumors associated with Von Recklinghausen's disease. CLINICAL CASE A 39 year old man consulted with a tumour on a finger of the right hand, which was not painful, and was slow growing. There was no past history of neurofibromatosis. Histological study showed a tumour of the peripheral nerve sheath, a benign type of neurofibroma containing glands. Immunohistochemical techniques confirmed that it had the stroma of a Schwannoma with well-defined glandular epithelial elements. CONCLUSIONS A neurofibroma with glands is considered to be a rare type of divergent differentiation, and of considerable interest to pathologists, since it must be differentiated from other tumoral lesions. Immunohistochemical study is very useful for this.
Collapse
Affiliation(s)
- T Cuesta
- Servicio de Anatomía Patológica, Hospital Clínico Quirúrgico Hermanos Ameijeiras, La Habana, Cuba.
| | | | | | | |
Collapse
|
27
|
Sanz P, Calvo A, Tobella L, Salazar S, Daher V, Castillo S, Nielsen E, Smok G, Csendes A, Serra I. [Chromosome anomaly and flow cytometry in gallbladder adenocarcinoma]. Rev Med Chil 1998; 126:1301-10. [PMID: 10349172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Affiliation(s)
- P Sanz
- Servicio de Genética, Escuela de Salud Pública, Universidad de Chile, Santiago de Chile
| | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Blasini AM, Brundula V, Paris M, Rivas L, Salazar S, Stekman IL, Rodriguez MA. Protein tyrosine kinase activity in T lymphocytes from patients with systemic lupus erythematosus. J Autoimmun 1998; 11:387-93. [PMID: 9802921 DOI: 10.1006/jaut.1998.0230] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [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: 11/22/2022]
Abstract
We have recently observed an abnormal pattern of protein tyrosine phosphoryl-ation in resting T lymphocytes obtained from peripheral blood of patients with systemic lupus erythematosus (SLE). To examine whether these findings may be related to dysregulated protein tyrosine kinase (PTK) function, we tested the relative amount and enzyme activity of the main PTKs involved in the earliest signalling steps triggered via the CD3 pathway. Cell lysates from peripheral blood T cells in SLE patients showed lower amounts of p59(fyn) and p56(lck) as shown by immunoblot. In contrast, the amount of ZAP-70, a PTK of the syk family, was comparable in both groups. However, p59(fyn) immuno-precipitates obtained from unstimulated peripheral blood SLE T cells showed enhanced PTK activity as compared to controls, whereas the PTK activity of p56(lck) and ZAP-70 molecules was comparable in both groups. The unchecked activity of the TCR/CD3-associated src kinase p59(fyn) may alter the balance needed for regulated T cell responses in SLE patients.
Collapse
Affiliation(s)
- A M Blasini
- Centro Nacional de Enfermedades Reumáticas, Hospital Universitario de Caracas, Caracas, Venezuela
| | | | | | | | | | | | | |
Collapse
|
29
|
Estupiñán B, Cuestas T, Salazar S, Domínguez-Alvarez C, Chong A, Ochoa L, López-Flores G, García-Maeso I. [Central neurocytoma]. Rev Neurol 1998; 27:47-50. [PMID: 9674024] [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: 02/08/2023]
Abstract
INTRODUCTION A central neurocytoma (CN) is a rare tumor, of neuronal origin, well-differentiated and found intraventricularly. It mainly affects young adults. Firm diagnosis is made on immunohistochemical (IHQ) and ultrastructural studies, since on optic microscopy it is similar in appearance to an oligodendroglioma or to an ependymoma. PATIENTS AND METHODS We studied 4 cases, three after surgical resection and one on autopsy. The average age was 29, ranging from 3 to 63. Both sexes were equally affected. In all cases IHQ techniques were used (GFAP, neurofilament, synaptophysin and specific neuronal enolase) and they were studied by electron microscopy. RESULTS IHQ was negative for GFAP and neurofilament, but intensely positive for synaptophysin and specific neuronal enolase. On ultrastructural study there were few neurofilaments, microtubules and dense central granules typical of neural differentiation. CONCLUSIONS The findings in our cases lead to diagnosis of NC and confirm that this tumor is a distinct clinicopathological entity.
Collapse
Affiliation(s)
- B Estupiñán
- Centro Internacional de Restauración Neurológica, CIREN, La Habana, Cuba.
| | | | | | | | | | | | | | | |
Collapse
|
30
|
|
31
|
Estupiñán Díaz B, Cuestas T, Salazar S, Domínguez Álvarez C, Chong López A, Ochoa Zaldivar LA, López Flores G, García Maeso I. Neurocitoma central. Rev Neurol 1998. [DOI: 10.33588/rn.27155.98024] [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]
|
32
|
Segovia N, Mena M, Monnin M, Peña P, Salazar S, Seidel J, Tamez E. Fluctuations of groundwater radon and chemical species in basaltic aquifers. RADIAT MEAS 1997. [DOI: 10.1016/s1350-4487(97)00176-5] [Citation(s) in RCA: 7] [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: 10/27/2022]
|
33
|
Garduño L, Salazar M, Salazar S, Morelos ME, Labarrios F, Tamaríz J, Chamorro GA. Hypolipidaemic activity of alpha-asarone in mice. J Ethnopharmacol 1997; 55:161-163. [PMID: 9032629 DOI: 10.1016/s0378-8741(96)01492-4] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- L Garduño
- Departamento de Toxicología, Sección de Graduados, Escuela Nacional de Ciencias Biológicas (I.P.N.), México, D.F., México
| | | | | | | | | | | | | |
Collapse
|
34
|
Abstract
Spirulina maxima, an edible micro-organism useful in human nutrition, was examined for its effect on general reproductive performance and for peri- and postnatal toxicity in rats at levels of 0, 10, 20 and 30% (w/w) incorporated into the diet. There was no reduction in body weight gain in males or females and no deaths or clinical signs of toxicity. Treatment was not associated with any adverse effect on any measure of reproductive performance, including male and female fertility and duration of gestation. There was no increase in the number of abnormal pups at caesarean section or at birth. S. maxima consumption did not result in adverse effects on developmental markers of the pups.
Collapse
Affiliation(s)
- M Salazar
- Department of Toxicology, National School of Biological Sciences, National Polytechnic Institute, Mexico City
| | | | | | | |
Collapse
|
35
|
Chamorro G, Salazar M, Salazar S, Ceballos G, Trujillo J, Munoz O, Yanez R. Antifertility effects of (+)-S-2-amino-6-iodoacetamidohexanoic acid (2-AIHA) in female rats. Contraception 1996; 53:247-51. [PMID: 8706444 DOI: 10.1016/0010-7824(96)00010-8] [Citation(s) in RCA: 5] [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: 02/01/2023]
Abstract
(+)-S-2-amino-6-iodoacetamidohexanoic acid (AIHA), an irreversible inhibitor of the ornithindecarboxylase and extrahepatic arginase enzymatic activities with antineoplasic properties, was evaluated for antifertility activity in pregnant rats by oral administration at different periods of gestation. Our results showed that doses of 10 and 20 mg/kg of AIHA orally administered produced a contraceptive effect when it was administered from days 2 to 5, and 8 to 12 of gestation, respectively. The gestation time was slightly shortened when AIHA was applied from day 15 until labor. No sign of external malformations in fetuses was observed. On the other hand, AIHA did not affect the total length of oestrous cycle at the same dosage level used to interrupt pregnancy. In ovariectomized immature rats, neither changes in uterine weight, premature vaginal opening, or cornified cells were found. However, AIHA enhanced the estradiol-induced increase in uterine weights when both were concomitantly administered.
Collapse
Affiliation(s)
- G Chamorro
- National School of Biological Sciences, Mexico D.F, Mexico
| | | | | | | | | | | | | |
Collapse
|
36
|
Chamorro G, Salazar M, Salazar S, Tamariz J. Evaluation of the domlinant lethal potentlal of alptia-asarone in malo mica. Toxicol Lett 1995. [DOI: 10.1016/0378-4274(95)94691-9] [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: 12/01/2022]
|
37
|
Chamorro G, Martínez M, Salazar M, Salazar S, Hong E. [Evaluation of the toxicity of indorenate on reproduction]. Arch Inst Cardiol Mex 1995; 65:300-306. [PMID: 8561650] [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: 05/22/2023]
Abstract
Indorenate (TR3369) a new antihypertensive drug, was examined for effects upon general reproductive performance, for peri-postnatal and embryofetal toxicity in the rat at doses of 0, 10, 20, 40 and 60 mg/kg/day by oral administration. Excluding the 60 mg/kg dose, in the fertility study, any dose produced neither decrement of body weight gain of progenitors, fertility, fetal weight nor survival rate. Retardation of the surface righting, pinnal unfolding or startle response were not observed. On the other hand, 40 and 60 mg/kg significantly increased the number of resorptions. In the peri-postnatal study, doses of 40 and 60 mg/kg incremented the number of dead pups at birth, and the later also affected the survival rate, growing and air righting reflex. Reproductive performance of the F1 offsprings was unimpaired. Indorenate in contrast to serotonin, from which it is a structural derivative, gave no evidence of teratogenicity when administered during the period of organogenesis. It was concluded that the parameters of fetal development were not affected by doses of up to 20 mg/kg, which represents approximately 1200 times the proposed dose for hypertensive patients.
Collapse
Affiliation(s)
- G Chamorro
- Departamento de Toxicología, Escuela Nacional de Ciencias Biológicas, I.P.N., México, D.F
| | | | | | | | | |
Collapse
|
38
|
Torres P, Franjola R, Pérez J, Auad S, Hermosilla C, Flores L, Riquelme J, Salazar S, Miranda JC, Montefusco A. [Intestinal geohelminthosis in man and domestic animals in the riverside sections of the Valdivia River Basin, Chile]. Bol Chil Parasitol 1995; 50:57-66. [PMID: 8762668] [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: 02/02/2023]
Abstract
In March-October 1987 were analyzed 1295 coprological specimens in a sample of the human population who lives in riverside localities in the Valdivia River Basin, Chile. A 23.6% of examined persons presented infection by one or more helminth species. The prevalence of infection by Ascaris lumbricoides, Trichuris trichiura and Trichostrongylidae gen. sp. were 15.5, 12.7 and 0.2%, respectively. The prevalence of human ascariosis and trichuriosis were greater in pre-school and school children. The sex of the host and prevalence of geohelminthosis did not show any relationship. Prevalences of ascariosis and trichuriosis were higher in persons from houses with no sanitary fecal and water disposal. Over 35% and 20.7% of family groups showed infection by A. lumbricoides and T. trichiura, respectively in over 40% of the members of each group. Fecal samples from domestic mammals revealed the following prevalences rates for helminth infections: in dogs 19.0 and 15.2% for Toxocara canis and Uncinaria stenocephala respectively, in cats 65.1% for Toxocara cati, and in pigs 25.4 and 3.2% for Ascaris suum and Trichuris suis respectively. Some of these species are clearly demonstrated agents of zoonoses.
Collapse
Affiliation(s)
- P Torres
- Facultad de Medicina, Universidad Austral de Chile, Valdivia
| | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Huaroto M, Lozano R, Beteta O, Huamán C, Salazar S. [Pediatric colonoscopic polypectomy]. Rev Gastroenterol Peru 1994; 14:204-8. [PMID: 8000023] [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: 01/28/2023]
Abstract
Colorectal polyps are relatively frequent in infancy and constitute one of the main causes of bleeding per rectum. Endoscopic polypectomy, with its lower morbidity and mortality, has revolutionized its treatment. Between October 1, 1985 and May 31, 1994, 122 polypectomies were done in 88 pediatric patients. Forty five patients (51.1%) were male and 43 female (48.9%). Forty four patients (50%) were between 1 and 5 years of age. Ninety five polyps (77.9%) were found more frequently in the rectum. Regarding the size, 63 polyps (51.6%) measured between 1 and 2 cm. Seventy three patients (83%) had a single polyp, 10 patients (11.4%) had 2 polyps and 1 patient had 12 polyps. Ninety six polyps (78.7%) were pedunculated, being this the more frequent form found. Histologically the most common was the juvenile polyp, found in 106 cases (87.6%). The polypectomies was carried out without using general anesthesia and is performed as an outpatient procedure. We had no experience of endoscopic complications. It is concluded that colonoscopy polypectomy is a useful, simple and safe procedure for treating colorectal polyps in children.
Collapse
Affiliation(s)
- M Huaroto
- Servicio de Gastroenterología Dr. Meilach Burstein Pait, Hospital Nacional Daniel Alcides Carrión, Callao, Perú
| | | | | | | | | |
Collapse
|
40
|
Chamorro G, Salazar M, Salazar S, Mendoza T. [Pharmacology and toxicology of Guatteria gaumeri and alpha-asarone]. Rev Invest Clin 1993; 45:597-604. [PMID: 8159883] [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: 01/29/2023]
Abstract
Guatteria gaumeri Greenman (Annonacease) has been used as bark infusion in the traditional mexican medicine for the treatment of hypercholesterolemia and cholelithiasis. The main component is alpha-asarone which has been isolated by different extraction procedures and subsequently synthetized, as well as 16 analogs, derivatives of 4-propenyl-1,2-dimethoxybenzenes 5-substituted. After daily dosing per os of 80 mg/kg of alpha-asarone and the amino and metoxi analogs for seven days to hypercholesterolemic male rats, cholesterol decreased 57.3, 37.5 and 46.9% and triglycerides diminished 42.5, 67.6 and 17.2% respectively. Some of the other analogs showed also important hypolipidemic activity. Similarly alpha-asarone decreased 80.6% the weight of gallstones in hamsters. Studies using adult rat hepatocytes suggest that at least part of the hypolipidemic effect of alpha-asarone could be due to a decrease in the secretion of lipids. Alpha-asarone did not produce any toxic effect after oral administration to rats of 10 or 50 mg/kg for 28 days, or genotoxicity by the dominant lethal test. However long-term exposure of cultivated hepatocytes to micromolar concentrations produced morphologic and ultrastructural alterations, triacylglycerol accumulation and inhibition of protein synthesis and secretion. At the same time both the Ames and sister-chromatid exchange tests showed genotoxic effect. No teratogenicity was observed in pregnant rats during organogenesis but in mice slight fetal toxicity was manifested by hydrocephaly, skeletal defects and fetal weight retardation. There are no data on the possible exposure levels in humans consuming the bark extract, but the toxic effects of alpha-asarone in animals suggest caution in the use of this plant.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- G Chamorro
- Departamento de Toxicología, Escuela Nacional de Ciencias Biológicas, I.P.N., México D.F
| | | | | | | |
Collapse
|
41
|
Sanz P, Calvo A, Tobella L, Nielsen E, Salazar S, Daher V, Castillo S, Molina G, López F, Morales B. [Chromosome aberrations in gallbladder adenocarcinoma]. Rev Med Chil 1993; 121:1342-3. [PMID: 8191147] [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: 01/29/2023]
|
42
|
Ramirez F, Salazar S, Madurga B, Ibañez R, Baez Perea JM, Flores Gines J. [Complete testicular feminization syndrome. Report of a case]. ARCH ESP UROL 1993; 46:735-7. [PMID: 8311529] [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: 01/29/2023]
Abstract
A case of complete testicular feminization (Morris syndrome) in a male pseudohermaphrodite is described. The results of the hormone analyses and the histological features of the resected gonad are presented. The literature is reviewed with special reference to whether gonadectomy should be performed in the pre or post-pubertal period. We advocate early castration because of the high incidence of germ cell neoplasia and the possibility of virilization in case of incomplete androgenic resistance. Our approach is based on the satisfactory feminization achieved by exogenous estrogen therapy.
Collapse
Affiliation(s)
- F Ramirez
- Hospital Universitario Puerta del Mar, Cádiz, España
| | | | | | | | | | | |
Collapse
|
43
|
Salazar S, Manriquez F, Carrera LM, Bravo JL. Elemental and morphological analyses of atmospheric particles from southwestern part of Mexico City. Bull Environ Contam Toxicol 1993; 51:247-254. [PMID: 8353388 DOI: 10.1007/bf00198888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- S Salazar
- National Autonomous University of Mexico, México
| | | | | | | |
Collapse
|
44
|
Useche E, Salazar S, Vetencourt R, Castillo J, Guzmán S. [The effectiveness of endoscopic retrograde cholangiopancreatography in the etiological diagnosis of postcholecystectomy syndrome]. G E N 1993; 47:157-61. [PMID: 8112552] [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: 01/28/2023]
Abstract
A retrospective study of 249 with symptoms and signs of postcholecystectomy syndrome was made to evaluate the usefulness of endoscopic retrograde cholangiopancreatography (ER CP) in its etiological diagnosis. From 1693 ERCP evaluated, 1108 were checked and from these 249 patients showed symptoms and signs after the cholecystectomy. So they were selected to practice a diagnostic ERCP. 204 patients were females and its principal symptom was jaundice. Lesions found in most of the cases were: stones in the bile ducts (45.78%), benign biliary stenosis (8.3%), stenosis of vater's papilla (7.22%) and biliary fistula (7.22%). It can be conclude that biliary stones is the most frequent pathology in those patients with clinical suspicion of biliary-pancreatic organicity and that ERCP is the principal method of diagnosis in these patients.
Collapse
Affiliation(s)
- E Useche
- Servicio de Vías Digestivas, Hospital Central Antonio María Pineda, Barquisimeto
| | | | | | | | | |
Collapse
|
45
|
Smith J, Chi D, Salazar S, Krish G, Berk S, Reynolds S, Cambron G. Effect of moderate exercise on proliferative responses of peripheral blood mononuclear cells. J Sports Med Phys Fitness 1993; 33:152-8. [PMID: 8105146] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We studied the effects of 30 minutes of exercise on T lymphocyte counts and proliferative responses of peripheral blood mononuclear cells (PBMC) in 25 runners. Exercise resulted in a T lymphocytosis in the immediate post-exercise period in all subjects (p < 0.001), and reduced CD4+/CD8+ ratios in 22/25 subjects (p = 0.001). The change was due primarily to a 2.2-fold increase in CD8+ cells (p < 0.001). Exercise also reduced PBMC mitogenic responses to phytohemagglutinin (PHA) in 13/14 subjects (p = 0.049), and to pokeweed mitogen (PWM) in 11/14 subjects (p = 0.022), but not to concanavalin A. Postrun sera from 5 of 6 subjects inhibited PHA but not PWM responses of resting autologous PBMC with normal CD4+/CD8+ ratios (p < or = 0.05): indomethacin and monocyte depletion blocked the serum inhibition (p = 0.003, p = 0.0006, respectively). We conclude that post-exercise suppression of mitogenic responses to PHA is due to the release of a serum factor(s) capable of inducing prostaglandin synthesis by circulating monocytes, whereas exercise-induced suppression of PWM responses depends primarily on the reversal of CD4+/CD8+ ratios.
Collapse
Affiliation(s)
- J Smith
- Department of Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City
| | | | | | | | | | | | | |
Collapse
|
46
|
Salazar S, Useche E, Vetencourt R. [Ultrasonography in the differential diagnosis of obstructive jaundice: comparison with endoscopic retrograde cholangiopancreatography]. G E N 1993; 47:73-7. [PMID: 8112540] [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: 01/28/2023]
Abstract
A retrospective study comparing ultrasound (US) and endoscopic retrograde cholangiopancreatography (ERCP) as practiced on 42 jaundiced patients. Obstruction of the bile ducts was demonstrated in 21 by US and in 33 by ERCP, this latter method was taken as the gold standard for comparison, and thus the sensibility of US for detecting obstructive jaundice was 64% and specificity was 89%. Choledocolithiasis and papillary stenosis were the most frequent etiologies, diagnosed in 26 cases by ERCP and in 14 cases by US. Of the 36 patients with gallbladder, US demonstrated gallstones in 28 cases (78%) and ERCP in 18 (50%). We conclude from this study that US has a high sensibility and specificity in patients in whom obstructive jaundice is suspected.
Collapse
Affiliation(s)
- S Salazar
- Servicio de Vías Digestivas, Hospital Central Antonio María Pineda, Barquisimeto, Edo. Lara
| | | | | |
Collapse
|
47
|
Daher V, Youlton R, Nazer J, Jorquera H, Astete C, Tobella L, Salazar S, Dabancens A. [Identical monozygotic triplets: the 1st case in Chile]. Rev Med Chil 1993; 121:456-8. [PMID: 8272622] [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: 01/29/2023]
|
48
|
Villegas-Navarro A, Bustos E, González A, Salazar S, Jiménez Z, Solis JG, Mercado R, González G, Reyes JL, Dieck TA. Effect of myotonia induced by anthracene-9-carboxylic acid on mitochondrial calcium, plasma creatinine-phosphokinase and aldolase activity in the rat. Exp Toxicol Pathol 1992; 44:34-9. [PMID: 1392515 DOI: 10.1016/s0940-2993(11)80135-1] [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: 12/26/2022]
Abstract
The frequent association of myotonia with dystrophy and the knowledge that calcium is increased in injured skeletal muscle cells suggest a possible relationship between cell calcium and myotonic alterations. This investigation has been performed to study the role of calcium in experimental myotonia induced by anthracene-9-carboxylic acid (9-AC) in rats treated with several regimens of food and exercise. Thirty-two rats were divided into 4 groups of 8 rats each, one control and 3 experimental groups. The treatments included caffeine plus exercise (group 2), and a calcium-rich diet (group 3); these procedures were designed to increase intracellular calcium; another group was treated with 9-AC as a myotonia-inducer (group 4). The treatment for all groups lasted 60 days. No significant differences in plasma sodium, potassium, chloride and calcium between control and experimental groups were observed. Whole muscle calcium in wet tissue samples did no change with any treatment. On the contrary, mitochondrial calcium showed a significantly higher concentration in group 3 and 4. CPK and aldolase activities in groups 1, 2 and 3 were similar; but in group 4 these enzyme activities were significantly higher (p less than 0.05). The electrical and mechanical responses were not altered in any rat with any experimental treatment. Our data suggest that myotonia is a predisposing factor for an altered mitochondrial calcium homeostasis in this model; in addition, the enzyme activities of CPK and aldolase were increased in the rats of group 4 implicating that myotonia is a crucial factor in the development of enzymatic abnormalities.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
|
49
|
Monge E, Lozano R, Salazar S. Esophageal tuberculosis. Am J Gastroenterol 1992; 87:156. [PMID: 1728117] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
50
|
Romero Tenorio M, Prada C, Salazar S, Aragón Montero MJ, Ramírez F. [The surgical treatment of anterior hypospadias. Apropos 590 cases (1966-1988). The indications and results. The current trends in surgical treatment]. Cir Pediatr 1991; 4:190-3. [PMID: 1760260] [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: 12/28/2022]
Abstract
The surgical treatment of hypospadias is very complex. The objective is to obtain a satisfactory urinary and genital function with an equal morphological, anatomical and aesthetic result. Our contribution covers twenty-two years of surgical multicentre experience (590 cases). We evaluate the surgical indication, results, complications, associated malformations and study protocols. We have objectively evaluated the evolution of the indications, as well as the application of different techniques depending on the extent of urethral malformation.
Collapse
|