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Search Results: 1 - 10 of 47262 matches for " Sergio; Hernández-Guerrero "
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Self-expanding metal stents versus antrectomy for the palliative treatment of obstructive adenocarcinoma of the gastric antrum Prótesis metálicas autoexpandibles versus antrectomía en el tratamiento paliativo del adenocarcinoma obstructivo del antro gástrico
Juan Octavio Alonso-Larraga,Julio César álvaro-Villegas,Sergio Sobrino-Cossio,Angélica Hernández-Guerrero
Revista Espa?ola de Enfermedades Digestivas , 2012,
Abstract: Background: gastric cancer patients are first diagnosed with an unresectable tumor in up to 40% of cases. Gastric outlet obstruction causes nausea, vomiting, dehydration and malnutrition. The aim of the study was to compare self-expanding metal stents to antrectomy and Roux-en Y gastrojejunostomy for palliation of obstructive adenocarcinoma of the gastric antrum. Methods: retrospective study in patients with obstructing cancer of the gastric antrum. Patients were divided into two groups: group A, underwent endoscopic placement of self-expanding metal stents and group B underwent surgical treatment with antrectomy and Roux-en Y gastrojejunostomy. Collected Data included: age, gender, performance status (Karnofsky's score), body mass index, histopathology, clinical stage (TNM classification), technical and clinical success of the procedure, time to oral intake, in-hospital stay, re-intervention rate, and complications related to the treatment and survival. Results: a total of 39 patients with gastric adenocarcinoma were included, 21 male and 18 female. Nineteen patients were assigned to group A and 20 patients to group B. There were no statistically significant differences between groups in regards to age, body mass index, Karnofsky's score and clinical stage. The technical and clinical success was similar for both groups. There was a statistically significant difference between groups favoring Self-expanding metal stent in time to oral intake (1 ± 0 vs. 4.9 ± 0.6 days, p = 0.0001) and in-hospital stay (0.94 ± 1.18 vs. 7.8 ± 7.7 days, p = 0.0005). We did not find statistically significant differences with regards to long-term survival. Conclusions: in patients with malignant gastric outlet obstruction due to gastric cancer, endoscopic palliation with self-expanding metal stents provide a shorter interval to oral intake, shorter in-hospital stay and lower rate of complications. Introducción: los pacientes con cáncer gástrico tienen un tumor irresecable hasta en el 40% de los casos. La obstrucción de salida gástrica ocasiona vómito, deshidratación y desnutrición. El objetivo de este estudio fue comparar las prótesis metálicas autoexpandibles con la antrectomia en el tratamiento paliativo del adenocarcinoma obstructivo del antro gástrico. Método: estudio restrospectivo en pacientes con adenocarcinoma obstructivo del antro gástrico. Los pacientes fueron divididos en dos grupos: grupo A) sujetos que fueron tratados mediante prótesis metálica autoexpandible y grupo B) aquellos que fueron tratados mediante antrectomía y gastroyeyunoanastomosis en Y de Roux. Las v
Argon plasma coagulation and hyperbaric oxygen therapy in chronic radiation proctopathy, effectiveness and impact on tissue toxicity
álvaro-Villegas,Julio César; Sobrino-Cossio,Sergio; Tenorio-Téllez,Luisa Catalina; Mora-Levy,José Guillermo de la; Hernández-Guerrero,Angélica; Alonso-Lárraga,Juan Octavio; Vela-Chávez,Teresa;
Revista Espa?ola de Enfermedades Digestivas , 2011, DOI: 10.4321/S1130-01082011001100004
Abstract: background: chronic radiation proctopathy (crp) is associated with recurrent rectal bleeding and transfusional requirements. argon plasma coagulation (apc) and hyperbaric oxygen therapy (hot) have been shown to be effective in the control of crp. no prospective comparisons have been reported between these treatments. aim: the aim was to evaluate the effectiveness, safety and impact on tissue toxicity of apc compared to hot in patients with crp. material and methods: a prospective study for evaluating treatment response was conducted. patients with cervical cancer and crp with rectal bleeding were recruited. they had not received previous treatment. collected data included: demographics, previous radiation dosage, duration and severity of rectal bleeding. hemoglobin, transfusional requirements, and tissue toxicity (soma lent questionnaire) at baseline and at 1, 2, and 3 months follow up were recorded. results: thirty-one patients were included, 14 in the apc group and 17 in the hot group. no response was noted in 13 and 18% of patients in the apc and hot group respectively (p = ns). at the 1 and 2 months follow-up, the apc group showed a significantly better response in terms of transfusional requirements (0.6 vs. 3.4 and 0.7 vs. 2.5) and tissue toxicity score (5.3 vs. 8.6 and 3.8 vs. 7.248). after 3 months, both groups showed further improvement in all parameters without significant differences between them. conclusions: apc and hot were effective, safe and decreased the tissue toxicity scores in patients with crp. however, response rate was higher and faster in the apc group.
Self-expanding metal stents versus antrectomy for the palliative treatment of obstructive adenocarcinoma of the gastric antrum
Alonso-Larraga,Juan Octavio; álvaro-Villegas,Julio César; Sobrino-Cossio,Sergio; Hernández-Guerrero,Angélica; Mora-Levy,Guillermo de la; Figueroa-Barojas,Paola;
Revista Espa?ola de Enfermedades Digestivas , 2012, DOI: 10.4321/S1130-01082012000400003
Abstract: background: gastric cancer patients are first diagnosed with an unresectable tumor in up to 40% of cases. gastric outlet obstruction causes nausea, vomiting, dehydration and malnutrition. the aim of the study was to compare self-expanding metal stents to antrectomy and roux-en y gastrojejunostomy for palliation of obstructive adenocarcinoma of the gastric antrum. methods: retrospective study in patients with obstructing cancer of the gastric antrum. patients were divided into two groups: group a, underwent endoscopic placement of self-expanding metal stents and group b underwent surgical treatment with antrectomy and roux-en y gastrojejunostomy. collected data included: age, gender, performance status (karnofsky's score), body mass index, histopathology, clinical stage (tnm classification), technical and clinical success of the procedure, time to oral intake, in-hospital stay, re-intervention rate, and complications related to the treatment and survival. results: a total of 39 patients with gastric adenocarcinoma were included, 21 male and 18 female. nineteen patients were assigned to group a and 20 patients to group b. there were no statistically significant differences between groups in regards to age, body mass index, karnofsky's score and clinical stage. the technical and clinical success was similar for both groups. there was a statistically significant difference between groups favoring self-expanding metal stent in time to oral intake (1 ± 0 vs. 4.9 ± 0.6 days, p = 0.0001) and in-hospital stay (0.94 ± 1.18 vs. 7.8 ± 7.7 days, p = 0.0005). we did not find statistically significant differences with regards to long-term survival. conclusions: in patients with malignant gastric outlet obstruction due to gastric cancer, endoscopic palliation with self-expanding metal stents provide a shorter interval to oral intake, shorter in-hospital stay and lower rate of complications.
Efecto en la hidrodinámica y transferencia de calor del desfasamiento entre placas de un intercambiador de calor de placas onduladas
Romero-Méndez,Ricardo; Mihir,Sen; Walfre,Franco; Hernández-Guerrero,Abel;
Interciencia , 2001,
Abstract: summary a numerical program was used to obtain information on the velocity, pressure and temperature fields of a channel geometry that resembles the central part of a corrugated plate heat exchanger. the focus is to analyze the effect that dephasing sinusoidal plate corrugations has on the overall heat transfer performance of the heat exchanger. the problem is described by the two-dimensional, steady-state flow field and heat transfer in a channel formed by a pair of equal amplitude and wavelength sinusoidal plates at different temperatures. a sufficiently long channel with several corrugations is considered so that periodic boundary conditions over one wavelength are assumed in the flow inside the inner corrugations and the flow is assumed to be laminar. results involving local and overall heat transfer as a function of plate dephasing are presented. the pressure drop across a single corrugation is also considered. an optimum configuration is determined for which the ratio of dimensionless heat transfer to dimensionless pressure drop is largest. the results are explained in the light of the hydrodynamic and thermal characteristics obtained in the numerical simulation.
Effect of the Structured Packing on Column Diameter, Pressure Drop and Height in a Mass Transfer Unit
Rosa H. Chávez,Javier de J. Guadarrama,Abel Hernández-Guerrero
International Journal of Thermodynamics , 2004, DOI: 10.5541/ijot.135
Abstract: In order to determine the dimension of a separation column, hydrodynamic and mass transfer models are necessary to evaluate the pressure drop and the mass transfer unit height. The present work evaluates the dependency of those parameters with respect to the diameter of the column by means of an absorption column. The process within the absorption column is carried out using three different structured-packings (ININ, Sulzer BX, and Mellapak) and one hazardous packing (Raschig rings), in order to recover SO2. Structured packing has been achieving wider acceptance due to its greater efficiency in the separation process. The results show how the ININ packing does the best work because it has the lowest height of the global mass transfer unit and the Mellapak packing has the largest capacity because it manages the largest flows.
Biomasa de Ulva spp. (Chlorophyta) en tres localidades del malecón de La Paz, Baja California Sur, México
Aguila-Ramírez,Ruth N; Casas-Valdez,Margarita; Hernández-Guerrero,Claudia J; Marín-álvarez,Alejandro;
Revista de biología marina y oceanografía , 2005, DOI: 10.4067/S0718-19572005000100006
Abstract: distribution and standing crop of ulva spp. were measured in three localities along the bayfront of la paz, baja california sur, during 2001 and 2002. some species of ulva, formerly in the genus enteromorpha, are utilized in some countries for human consumption. we utilized a systematic sampling method, using as sampling unit a 25 x 25 cm square placed every 10 m throughout transects perpendicular to the coastline which were drawn every 40 m. in both years the greatest average biomass was found at el palmar. the largest biomass of ulva spp. was recorded during may 2001 and february 2002. the average biomass was 351 g m-2 in 2001 and 537 g m-2 in 2002. the maximum values of the standing crop were found at el kiwi in both years. the great increase in substratum in 2002 may explain the large volumes of the standing crop, estimated as 115 t wet. we recommend investigation to see if there is a market for this biomass leading to its sustainable exploitation
Bebidas embotelladas como fuentes adicionales de exposición a flúor
Loyola-Rodríguez,Juan Pablo; Pozos-Guillén,Amaury de Jesús; Hernández-Guerrero,Juan Carlos;
Salud Pública de México , 1998, DOI: 10.1590/S0036-36341998000500008
Abstract: objective. to evaluate and to report the concentration of fluoride in soft drinks and juices consumed in san luis potosí, s.l.p., mexico, and its implications as a risk factor for developing dental fluorosis. material and methods. the contents of some products from 2 main national companies and 2 other local companies were studied. the samples were collected from 10 different batches in the case of the soft drinks, and from 5 batches in the case of the juices, with 3 samples per batch, during 3 months. the ión selective electrode method was used to determine the concentration of fluoride. results. soft drinks from 2 main national companies showed high fluoride concentrations that were statistically significant between groups (p< 0.05). fluoride levels of products from local and national companies also showed differences that were statistically significant between groups (p< 0.05). all natural juices tested showed high fluoride concentrations. conclusions. most soft drinks and juices consumed in slp had high fluoride levels above mexican regulations (0.7 ppm) and could be a substantial risk factor for developing dental fluorosis.
Bebidas embotelladas como fuentes adicionales de exposición a flúor
Loyola-Rodríguez Juan Pablo,Pozos-Guillén Amaury de Jesús,Hernández-Guerrero Juan Carlos
Salud Pública de México , 1998,
Abstract: Objetivo. Evaluar y notificar la concentración de fluoruro en bebidas embotelladas que se consumen en la ciudad de San Luis Potosí, S.L.P., México y su implicación como factor de riesgo a fluorosis dental. Material y métodos. Se estudió el contenido de algunos productos de las dos compa ías refresqueras más importantes de México y de otras dos locales. Las muestras se recolectaron de 10 lotes diferentes en el caso de los refrescos y de cinco lotes en el de los jugos, con tres muestras por lote, durante tres meses. La determinación de concentración de fluoruro se realizó mediante el método del electrodo de ión selectivo. Resultados. La concentración de flúor de muestras de diferentes plantas de compa ías nacionales presentaron diferencias estadísticas significativas entre grupos (p< 0.05). La comparación de resultados entre compa ías nacionales y locales también mostró diferencia estadística significativa (p< 0.05). Los diferentes jugos presentaron concentraciones de flúor elevadas. Conclusiones. La mayoría de las bebidas embotelladas que se consumen en San Luis Potosí presentaron niveles de flúor por arriba de la norma mexicana (0.7 ppm) y pueden ser un factor de riesgo adicional de fluorosis dental en su población.
Análisis microbiológico de úlceras de presión en pacientes del Centro Nacional de Rehabilitación (CENARE)
Karla Villalobos-Camacho,Mercedes Hernández-Guerrero,Susana Arteaga-Acevedo,Federico Montero-Mejía
Acta Médica Costarricense , 2001,
Abstract: Justificación y objetivo: Las úlceras de presión son áreas localizadas de tejido necrótico que tienden a desarro-llarse cuando los tejidos blandos son comprimidos entre una prominencia ósea y una superficie externa. La principal complicación de estas lesiones es que pueden constituirse en focos primarios de infecciones bacterianas. El objetivo del presente estudio fue realizar un análisis microbiológico de las úlceras de presión en pacientes de las unidades de Lesionados Medulares, Neurotrauma y Fisiatría General del Centro Nacional de Rehabilitación para determinar cuáles bacterias aerobias predominan en dichas lesiones y determinar el perfil de susceptibilidad a los antibióticos de los aislamientos bacterianos. Métodos: En este estudio se incluyeron 50 muestras recolectadas de 35 úlceras de presión en un total de 22 pacientes con da os en la médula espinal atendidos durante el período de agosto de 1998 a marzo de 1999. Las muestras fueron cultivadas en medios convencionales para el aislamiento de bacterias aerobias. La identificación de los aislamientos se realizó mediante pruebas bioquímicas y el sistema Vitek . El perfil de susceptibilidad a antibióticos se realizó mediante la técnica Kirby-Bauer con respaldo por el sistema Vitek . Resultados: Los microorganismos más frecuentemente aislados fueron P. aeruginosa, Staphylococcus coagulasa-negativa, S. intermedius y A. baumannii, los cuales presentaron resistencia contra diversos antibióticos. No se encontró ningún aislamiento de Staphylococcus aureus meticilina-resistente en las lesiones estudiadas. A lo largo del estudio se observó variabilidad en los perfiles de resistencia en aislamientos de P. aeruginosa de un paciente durante su internamiento, lo cual sugiere adquisición de genes de resistencia y sustitución de cepas. Los perfiles de resistencia sugieren una posible transmisión intrahospitalaria de cepas de P. aeruginosa, Staphylococcus coagulasa-negativa y S. intermedius. Conclusiones: El presente estudio indica que la biota bacteriana encontrada en las úlceras de presión en pacientes con lesiones medulares del CENARE está constituida principalmente por P. aeruginosa, Staphylococcus coagulasa-negativa, S. intermedius y A. baumannii, que muestran resistencia a diversos antibióticos y que son probablemente de origen intrahospitalario. Background and aim: The pressure sores are areas of necrotic tissue that develop when soft tissues are compressed between a bone and an external surface. Bacterial infections are the main complication of the pressure sores. The aim of this study was to perform a micro
Fluorosis en dentición temporal en un área con hidrofluorosis endémica
Loyola-Rodríguez,Juan Pablo; Pozos-Guillén,Amaury de Jesús; Hernández-Guerrero,Juan Carlos; Hernández-Sierra,Juan Francisco;
Salud Pública de México , 2000, DOI: 10.1590/S0036-36342000000300005
Abstract: objective: the aim of the present study was to estimate the prevalence of dental fluorosis in primary dentition of a san luis potosi children population, and its association to fluoride concentration in drinking water and urine. an additional objective was, to develop, validate, and test a specific index for dental fluorosis in primary dentition. material and methods: from may 1997, to january 1999, we conducted a cross-sectional study to assess the prevalence of dental fluorosis in primary dentition. study subjects were 100 children aged 3-6 years, selected at random from three kindergartens in three risk areas of san luis potosi. the specific index of dental fluorosis for primary dentition (dental fluorosis for primary dentition index-dfpdi) was validated by estimating fluoride concentrations in enamel of teeth with and without dental fluorosis. the kruskal-wallis test was used to assess the association between fluoride concentrations in drinking water and urine, with dental fluorosis; the association between risk area and dental fluorosis was assessed with the mantel-haenszel c2 test. results: . the prevalence of dental fluorosis in primary dentition was 78%; primary molars were most affected in both maxillae and the predominant color was a non-glossy white appearance. we found a strong direct correlation (r=0.93) between fluoride concentrations in primary teeth and the dfpdi. associations were found between fluoride concentrations of drinking water and urine, with dental fluorosis (kruskal-wallis p=0.00001), and between risk area and dental fluorosis (mantel-haenszel c2 p=0.00001). conclusions: dfpdi allowed adequate identification and grading of dental fluorosis in primary dentition. it is important to detect the initial toxic effects of fluoride exposure to predict dental fluorosis in permanent dentition and skeletal fluorosis.
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