10 results on '"Roberto Zayas"'
Search Results
2. Scientific production on COVID-19 in Cuban medical journals during the first 90 days after the start of the pandemic
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Roberto Zayas Mujica, Soraya Madero Durán, Beatriz Rodríguez Alonso, and José Enrique Alfonso Manzanet
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ciencia ,ciencia de información médica ,producción científica y tecnología nacional ,coronavirus ,pandemias ,covid-19 ,Medicine (General) ,R5-920 ,Public aspects of medicine ,RA1-1270 - Abstract
Introduction: Since the first case of SARS-CoV-2 was confirmed, the pandemic has experienced an almost uncontrollable increase in the number of cases. The scientific production plays a key role in the fight against the necessary control and eradication of the pandemic. From the very beginning, thousands of articles per day are produced at international level; furthermore, editorials and databases have made a great effort to give due priority and visibility to these contributions. Cuba has made significant efforts in this respect. Objective: To characterize the scientific production on COVID-19 in Cuban medical journals during the first ninety days after the start of the pandemic in Cuba. Material and Methods: A cross-sectional descriptive study aimed at analyzing 100% of the scientific medical journals was conducted. Variables such as documental typology, institutional and collaborative affiliations, subject matter, country and time of publication, among others were identified. Results: In total, 58 % of the articles were published in medical journals and 31,1 % was a contribution by Medisur Journal, University of Medical Sciences in Cienfuegos. In addition, 77,8 % of the articles were written by Cuban health researchers, 22,6 % of the articles were Letters to the Editor and 20,8 % were original articles. Conclusions: Over the period studied, the national scientific production in Cuban medical journals is low taking into account that the Letters to the Editor are not actual research articles. Some subject areas in Medical Sciences such as Family Medicine, which could have contributed with their experiences in research work within the community, have not produced any scientific article during this period of time.
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- 2020
3. Propuesta para la evaluación de la calidad y el funcionamiento de Revistas Científicas en Ciencias de la Salud
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José Enrique Alfonso Manzanet, Roberto Zayas Mujica, Alberto Juan Dorta-Contreras, and José Luis Cadenas Freixas
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Medicine (General) ,R5-920 ,Public aspects of medicine ,RA1-1270 - Abstract
Introducción: Cuba cuenta en la actualidad con más de 50 títulos de revistas científicas en Ciencias de la Salud catalogadas como Revistas Científicas, según el Ministerio de Ciencia Tecnología y Medio Ambiente. Sin embargo, el mantenimiento de la calidad de las publicaciones, así como las perspectivas de que puedan escalar en posicionamiento global se hace difícil si no se mantiene un sistema de evaluación permanente. Objetivo: Diseñar una propuesta de indicadores de evaluación del funcionamiento y la calidad de las revistas cubanas en Ciencias de la Calud, lo que contribuirá en lograr una sintonía con las mejores publicaciones a nivel internacional. Resultados: Se analizaron sistemas de evaluación de varias bases de datos teniéndose como criterios universales y se hicieron adecuaciones al contexto cubano. Se obtuvo un modelo dividido en tres ejes y con 28 indicadores. La propuesta está desarrollada para su implementación en una primera etapa de evaluación y deberá irse incrementando en la medida en que los indicadores se vayan consolidando. Conclusiones: Se diseñó una propuesta de indicadores de evaluación del funcionamiento y la calidad de las revistas cubanas en Ciencias de la Salud en base a criterios de calidad informativa; calidad del proceso editorial y calidad científica de la publicación, que contribuirá a lograr una sintonía con las mejores publicaciones a nivel internacional.Palabras claves: Estudios de evaluación, revistas electrónicas, calidad, funcionamiento, indicadores.
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- 2018
4. Activation of apoptotic pathways at muscle fiber synapses is circumscribed and reversible in a slow-channel syndrome model
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Bhupinder P.S. Vohra, Jason S. Groshong, Roberto Zayas, Robert L. Wollmann, and Christopher M. Gomez
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Caspase ,Apoptosis ,Channelopathy ,Mutation ,Acetylcholine receptor ,Neuromuscular junction ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
In the slow-channel syndrome (SCS) mutant acetylcholine receptors elicit calcium overload and myonuclear degeneration at the neuromuscular junction (NMJ), without muscle fiber death. Activated caspases are present at SCS motor endplates. We hypothesized that SCS represents a limited form of apoptosis. We found condensed chromatin and occasional single-strand DNA nicks in degenerating synaptic nuclei. Cleaved forms of caspases-3 and -9 were present in mouse SCS muscle homogenates and were specifically localized to NMJs. Finally, interruption of cholinergic activity by axotomy markedly reduced NMJ caspase activity and improved the morphological features of apoptosis at NMJs. These results demonstrate that in SCS processes leading to apoptosis may remain compartmentalized and reversible. Use of cysteine protease inhibitors may aid in treatment of this and other dystrophic muscle and excitotoxic disorders. Identification of extrasynaptic factors that prevent the spread of apoptosis in SCS muscle fibers may aid in developing treatments for neurological disorders characterized by excitotoxicity or apoptosis.
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- 2006
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5. Terapia de ressincronizaçao com marcapassos biventriculares. Avaliaçao em 5 anos de seguimento
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Roberto Zayas Molina, Osmim Castaneda Chirino, Juan Valiente Mustelier, Raimind Garcia Fernandez, Jesus Castro Hevia, Alfredo Vazquez Cruz, Marcos Rodriguez Garcia, and Francisco Dorticos Balea
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Ressincronizaçao ,Marcapassos ,Assincronia ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
A terapia de ressincronizaçao (TRC) demonstrou sua utilidade em pacientes com insuficiência cardíaca (IC) congestiva. OBJETIVOS: Determinar a resposta clínica, ecocardiográfica e a sobrevivência em pacientes com TRC, em 5 anos de seguimento. MÉTODOS: Entre dezembro de 2002 e novembro de 2006, foram implantados marcapassos biventriculares em 47 pacientes com IC refratária, classes funcionais (CF) avançadas e assincronia mecânica ventricular; seguimento em 43 casos. Em 5 anos, foram avaliados: hospitalizaçoes, teste de esforço (TE), CF, variáveis ecocardiográficas e sobrevivência. RESULTADOS: Houve reduçao das hospitalizaçoes, melhora da CF e do TC (p = 0,000). A fraçao de ejeçao do ventrículo esquerdo aumentou de 23,4% ± 5,3 a 33,4% ± 9,2 nos sobreviventes e de 18,1% ± 4,3 a 28,2% ± 5 nos falecidos. O volume sistólico final do ventrículo esquerdo foi reduzido 24,3%. 9,3% foram nao respondedores. Faleceram 16 pacientes (56,2 % de forma súbita e 43,7 % com CF IV prévia). As mulheres tiveram menor mortalidade (31,3% vs 40,7%). Sobrevivência em 5 anos: 62,7%. CONCLUSOES: A TRC teve resultados favoráveis. A MS foi a principal causa de morte. O sexo masculino, a FEVI prévia 23% e a CF IV tiveram pior prognóstico.
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- 2012
6. Arritmias Supraventriculares y Síndrome de Brugada
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Francisco Dorticós BALEA, Jesús Castro HEVIA, Roberto Zayas MOLINA, Margarita Dorantes SANCHEZ, Miguel Quiñones PÉREZ, Yanela Fayat RODRIGUEZ, and Jorge L Arbaiza SIMON
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fibrilación auricular, taquicardia intranodal, síndrome de Brugada ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
El síndrome de Brugada está constituido por un patrón electrocardiográfico característico y tendencia a presentar síncopes o paro cardiaco por arritmias ventriculares malignas. La asociación de fibrilación auricular es de un 10%. En los últimos 6 años atendimos 15 pacientes (13 masculinos), portadores de esa entidad; en dos se constataron episodios de fibrilación auricular y otro tenía documentado una taquicardia intranodal. El primero había presentado un síncope, la estimulación eléctrica programada desde ventrículo derecho desencadenó fibrilación ventricular autolimitada, se le implantó un desfibrilador automático; el segundo aquejaba palpitaciones irregulares, de corta duración, se le indujo fibrilación auricular por manipulación de catéteres, la estimulación eléctrica programada no provocó arritmias. Al paciente con taquicardia intranodal se le realizó ablación exitosa de la vía lenta, previa estimulación eléctrica programada desde ventrículo derecho negativa. Ninguno de ellos tenía antecedentes familiares de muerte súbita. En el seguimiento entre 3 y 15 meses, el primer paciente al que se implantó el desfibrilador automático presentó dos descargas eléctricas del mismo por episodios nocturnos de fibrilación ventricular, el segundo paciente presentó otro episodio similar de palpitaciones autolimitadas y el tercero se mantiene asintomático, sin fármacos. La incidencia de arritmias supraventriculares en esta entidad es elevada. Las manifestaciones clínicas, la documentación de la taquicardia y la estimulación eléctrica programada nos permitirán diagnosticarlas y tratarlas adecuadamente.
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- 2002
7. Síndrome de Brugada: a Propósito de Cinco Casos
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Jesús Castro HEVIA, Francisco Dorticós BALEA, Margarita Dorantes SANCHEZ, Roberto Zayas MOLINA, Miguel Quiñones PÉREZ, and Gustavo Padrón PEÑA
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muerte súbita cardiaca, síndrome de Brugada, fibrilación ventricular ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
El síndrome de Brugada es causa frecuente de muerte súbita en pacientes sin cardiopatía estructural demostrable. Está caracterizado por aparente bloqueo de rama derecha, elevación del segmento ST en V1-V3 y probabilidad de presentar síncope o paro cardiaco por arritmias ventriculares malignas. Se diagnosticaron cinco pacientes en los últimos 5 años con exclusión de patología estructural cardiaca; cuatro debutaron con una parada cardiaca en fibrilación ventricular y uno con síncope. En un paciente se detectó alternancia de la morfología del ST, complejo a complejo en V1-V2, en la prueba de ajmalina, rechazó implantarse un desfibrilador automático, se indicó amiodarona y propranolol, evolucionó sin arritmias durante 4 años y 9 meses. A tres se les implantó el desfibrilador; uno recibió 12 choques adecuados, 9 de ellos en 72 horas en el mes 18 del implante, debido a una
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- 2001
8. Calpain activation impairs neuromuscular transmission in a mouse model of the slow-channel myasthenic syndrome
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Groshong, Jason S., Spencer, Melissa J., Bhattacharyya, Bula J., Kudryashova, Elena, Vohra, Bhupinder P.S., Roberto, Zayas, Wollmann, Robert L., Miller, Richard J., and Gomez, Christopher M.
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Research ,Health aspects ,Neuromuscular diseases -- Research ,Calpain -- Health aspects -- Research ,Neuromuscular transmission -- Health aspects -- Research - Abstract
The slow-channel myasthenic syndrome (SCS) is a hereditary disorder of the acetylcholine receptor (AChR) of the neuromuscular junction (NMJ) that leads to prolonged AChR channel opening, [Ca.sup.2+] overload, and degeneration [...]
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- 2007
9. Integración de la red de bibliotecas de Ciencias de la Salud de Cuba para el desarrollo sostenible de la biblioteca virtual de salud regional
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Dr.C. Roberto Zayas Mujica and Dr.C. María de las Mercedes Fernández Valdés
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library services ,health sciences ,virtual libraries ,information systems ,lcsh:Z ,lcsh:Bibliography. Library science. Information resources - Abstract
The library systems in the modern era are the critical link to link on a common purpose to individuals and institutions that manage information and knowledge in a particular subject area. These systems are themselves social and open systems, are based on activities that complement and interact in space and time. The paper describes in detail the elements of network science libraries in Cuba health and how each one contributes greatly to the life cycle of information in medical libraries. Combine in a triad activity of “Traditional Library” with the “Health Library” and the use of technology to support the development of information management in each model. We propose a flow that links the document management, information management and knowledge management from INFOMED to the library network and vice versa to ensure effectiveness and efficiency of each business process and the development of a smart grid where all members form true communities of practice that integrate information and knowledge to the Virtual Health Library Latin American and Caribbean (NLM).
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- 2014
10. Novel β subunit mutation causes a slow-channel syndrome by enhancing activation and decreasing the rate of agonist dissociation
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Ricardo A. Maselli, Kelly Schott, Christopher M. Gomez, Roberto Zayas, Manuel F. Navedo, José A. Lasalde-Dominicci, Julie Staub, Carlos A. Báez-Pagán, Luzed Díaz-Pérez, and Legier V. Rojas
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Agonist ,Male ,medicine.medical_specialty ,Cell Membrane Permeability ,medicine.drug_class ,Neuromuscular transmission ,Neuromuscular Junction ,Biology ,Receptors, Nicotinic ,Synaptic Transmission ,Neuromuscular junction ,Article ,Ion Channels ,Cellular and Molecular Neuroscience ,Xenopus laevis ,Internal medicine ,medicine ,Animals ,Humans ,Calcium Signaling ,Muscle, Skeletal ,Molecular Biology ,Ion channel ,Acetylcholine receptor ,Aged ,Myasthenic Syndromes, Congenital ,Excitatory Postsynaptic Potentials ,Cell Biology ,Acetylcholine ,Compound muscle action potential ,Pedigree ,Kinetics ,Endocrinology ,medicine.anatomical_structure ,Amino Acid Substitution ,Mutation ,Excitatory postsynaptic potential ,Oocytes ,Female ,medicine.drug - Abstract
We traced the cause of a slow-channel syndrome (SCS) in a patient with progressive muscle weakness, repetitive compound muscle action potential and prolonged low amplitude synaptic currents to a V --> F substitution in the M1 domain of the beta subunit (betaV229F) of the muscle acetylcholine receptor (AChR). In vitro expression studies in Xenopus oocytes indicated that the novel mutation betaV229F expressed normal amounts of AChRs and decreased the ACh EC50 by 10-fold compared to wild type. Kinetic analysis indicated that the mutation displayed prolonged mean open duration and repeated openings during activation. Prolonged openings caused by the betaV229F mutation were due to a reduction in the channel closing rate and an increase in the effective channel opening rate. Repeated openings of the channel during activation were caused by a significant reduction in the agonist dissociation constant. In addition, the betaV229F mutation produced an increase in calcium permeability. The kinetic and permeation studies presented in this work are sufficient to explain the consequences of the betaV229F mutation on the miniature endplate currents and thus are direct evidence that the betaV229F mutation is responsible for compromising the safety margin of neuromuscular transmission in the patient.
- Published
- 2006
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