Association between infliximab concentrations and clinical response in psoriasis: a prospective cohort study.

BACKGROUND: Infliximab (IFX) trough concentrations (Cmin) have been linked to treatment efficacy in psoriatic patients. Inter-individual IFX Cmin variability and factors influencing IFX pharmacokinetics could explain differences in treatment response. OBJECTIVE: To evaluate the association between IFX Cmin and clinical outcomes in psoriatic patients. METHODS: Prospective study of 33 patients with moderate to severe psoriasis receiving IFX at Bellvitge University Hospital, between October 2013 and November 2016. IFX Cmin and antibodies toward infliximab (ATI) were measured. RESULTS: We collected 155 IFX Cmin and ATI values (mean age, 46 (14) years; 11 (33.3%) women). Mean IFX Cmin was 2.5 (2.4) mg/L and ATIs were detected in six patients, resulting in undetectable IFX Cmin. IFX Cmin was significantly associated with ATI and body mass index (BMI) (ß -2.51, 95% CI -3.56 to -1.4 and ß -0.05, 95% CI -0.09 to -0.01). PASI score and PASI 90/100 response were significantly associated with IFX Cmin (IRR 0.80, 95% CI 0.70 to 0.92; OR 1.79, 95% CI 1.18 to 2.71 and OR 1.79, 95% CI 1.14 to 2.81). CONCLUSION: IFX Cmin significantly influences PASI 90/100 response rates. IFX Cmin wa significantly associated with ATI and BMI. The observed inter-individual variability in IFX Cmin supports the need for IFX drug monitoring.

In-vitro evaluation of the adhesion to polypropylene sutures of non-pigmented, rapidly growing mycobacteria.

The ability of non-pigmented, rapidly growing mycobacteria (NPRGM) to attach to polypropylene sutures was evaluated using an in-vitro assay. Thirty clinical isolates and five culture collection strains of NPRGM, together with Staphylococcus epidermidis ATCC 35983, were tested. Mycobacterium fortuitum and Mycobacterium chelonae showed the highest attachment ability, which differed significantly from the results obtained with Mycobacterium peregrinum. According to these results, NPRGM are able to attach to polypropylene sutures, and the species implicated most frequently in human infection showed increased levels of attachment in comparison with the other mycobacteria studied.

[Pharmacokinetic interaction between valproic acid and meropenem]. / Interacción farmacocinética entre ácido valproico y meropenem.

Several reports have described a decrease in valproic acid (VPA) serum concentrations when carbapenem therapy is administered. The exact mechanism of this pharmacokinetic interaction is unknown, although several experimental studies have been carried out in animals. Because of these interactions, plasma concentrations of VPA in these patients should be monitored and, whenever possible, VPA or carbapenem therapy should be substituted by other drugs. We describe the cases of two epileptic children who simultaneously received meropenem and VPA. Concentrations of VPA decreased to subtherapeutic levels. We review the various mechanisms for this interaction proposed to date, as well as all reported cases.

[Compliance with the PECARN and AEP guidelines in diagnostic approach of mild head trauma in patients younger than 24 months old]. / Adecuación del manejo diagnóstico del traumatismo craneoencefálico leve en menores de 24 meses a las guías de práctica clínica de PECARN y AEP.

INTRODUCTION: Mild head trauma is a frequent complaint in Pediatric Emergency Departments. Several guidelines have been published in the last few years. However, significant variability can be appreciated in terms of the demand for image tests. The aim of this study is to determine the level of compliance with PECARN and AEP guidelines in the management of patients younger than 24 months old in four different hospitals. PATIENTS AND METHODS: A multicenter retrospective study was conducted on patients presenting with mild head trauma between October 1st, 2011 and March 31st, 2013 in the Emergency Departments of four hospitals. RESULTS: In the analysis of the results obtained, only one of the four hospitals complied with the AEP guidelines in more than 50% of the patients. The other three hospitals had a level of compliance lower than 50%. Management was more suitable according to PECARN guidelines, with 3 of the 4 hospitals having a level of compliance greater than 50%. However, the best compliance achieved by a hospital was only of 70%. CONCLUSIONS: The study shows that the level of compliance with guidelines for management of mild head trauma in patients younger than 24 months old is low.

Increased frequency of chromosomal aberrations in railroad car painters.

The purpose of this study was to determine if exposure to paints and solvents contributes to chromosomal alterations in occupationally exposed individuals. A total of 25 male railroad and underground railroad car painters were studied. This group had a mean age of 32.7 y and a mean exposure time of 5.2 y. The results were compared with those obtained for 25 healthy (unexposed) males. The scoring of structural chromosome aberrations clearly revealed an increase in the number of all types of aberrations considered in the population of painters. This suggests that exposure to a combination of chemicals may increase genotoxicity in industrial workers.

Prevalencia y características de uveítis como manifestación extraarticular en Espondiloartritis Axial / Prevalence and characteristics of uveitis as an extra-articular manifestation in Axial Spondyloarthritis

Introducción: La Uveítis Anterior Aguda (UAA) es la manifestación extraarticular más frecuente en la Espondiloartritis axial (EsPax), con una prevalencia global de 32,7%. El objetivo de este estudio fue determinar la prevalencia de UAA en una cohorte Argentina de pacientes con EsPax, describir sus características clínicas, frecuencia de episodios, respuesta al tratamiento y pronóstico a largo plazo, así como su asociación con características generales de la enfermedad. Material y métodos: Se realizó un estudio de corte transversal. Se incluyeron pacientes con diagnóstico de EsPax (criterios ASAS 2009) de la cohorte ESPAXIA (Estudio de Espondiloartritis Axial IREP Argentina). Se consignaron datos sociodemográficos, características de la enfermedad y tratamientos recibidos; números de episodios de uveítis, año de aparición, características del mismo, tratamiento realizado y complicaciones. Se registró rigidez matinal, medidas de movilidad axial por Bath Ankylosing Spondylitis Metrological Index (BASMI), número de articulaciones tumefactas, sitios de entesitis por medio de Maastricht AS Enthesitis Score (MASES), eritrosedimentación (ERS), proteína C reactiva (PCR) y presencia de HLA-B27. Se empleó Escala Visual Numérica (EVN) para evaluar el dolor, dolor nocturno, actividad de la enfermedad según el paciente y el médico. Se administraron autocuestionarios: Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), Bath Ankylosing Spondylitis Functional Index (BASFI) y Ankylosing Spondylitis Quality of Life (ASQoL). Se calculó Simplified Ankylosing Spondylitis Disease Activity Score con ERS y PCR (SASDAS ERS/PCR). Análisis estadístico: Estadística descriptiva. Test T de Student, test de Chi² y análisis de regresión logística múltiple. Se consideró significativo un valor de p<0,05. Resultados: Se incluyeron 231 pacientes con EsPax, 174 de sexo masculino (75,3%) con una mediana de edad de 46 años (RIC 36-57) y mediana de tiempo de evolución de la enfermedad de 20,5 años (RIC 10,5-30,5). Sesenta pacientes (26%) presentaron al menos un episodio de uveítis, siendo la primera manifestación de la enfermedad en 22 (37,9%) de ellos. La UAA fue la forma más frecuente, observándose en 59 pacientes (98,3%). El promedio de episodios de UAA fue 4,78 (DS 5,64). Las recurrencias fueron unilaterales en 48,8% de los casos. El tratamiento recibido fue local en 42 (79,2%) de los pacientes. Doce pacientes (22,2%) presentaron secuelas luego del primer episodio, siendo la disminución de la agudeza visual y cataratas las más frecuentes (16,7% y 5,6%, respectivamente). Las variables asociadas independientemente con UAA fueron mayor tiempo de evolución de la enfermedad (24,91±14,2 años vs 20,7±13,2 años, p=0,038) y positividad de HLA-B27, (69% vs 47,4%, p=0,006). Conclusión: La prevalencia de uveítis en nuestra cohorte fue del 26%. Fue significativamente más frecuente en pacientes HLA-B27 (+) y con mayor tiempo de evolución de la enfermedad.

Background: Acute Anterior Uveitis (AAU) is the most frequent extra-articular manifestation in axial Spondyloarthritis (axSpA), with an overall prevalence of 32.7%. The aim of this study was to determine the prevalence of AAU in an Argentinian cohort of patients with axSpA and to describe their clinical characteristics, frequency of episodes, response to treatment and long-term prognosis, as well as their association with general disease characteristics. Methods: A cross-sectional study was carried out. We included patients with axSpA according to ASAS 2009 criteria from ESPAXIA cohort (Estudio de Espondiloartritis Axial IREP Argentina). Sociodemographic data, characteristics of the disease, and treatments received; numbers of episodes of uveitis, incidence date, and its characteristics, treatment and complications were consigned. Morning stiffness, axial mobility (BASMI), enthesitis (MASES), ESR, CRP and HLA-B27 were registered. Pain, night pain, patient and physician global assessment were evaluated by Numerical Visual Scale (NVA). BASDAI, BASFI and ASQoL self-questionnaires were administered. Statistical analysis: Descriptive statistics. Student's T-test, Chi² test and multiple logistic regression analysis. A p value <0.05 was considered significant. Results: Two hundred and thirty one patients with axSpA were included, 174 male (75.3%) with a median age of 46 years (IQR 36-57) and median disease duration of 20.5 years (IQR 10.5-30.5). Sixty patients (26%) had at least one episode of uveitis, being the first manifestation of the disease in 22 (37.9%) of them. Acute anterior uveitis was the most frequent form, and it was observed in 59 patients (98.3%). The mean number of episodes was 4.78 (SD 5.64). Recurrences were unilateral in 48.8% of cases. They received local therapy in 42 (79.2%) of the patients. Twelve patients (22.2%) presented a complication after the first episode, being the decrease in visual acuity and cataracts, the most frequent ones (16.7% and 5.6%, respectively). The presence of uveitis was significantly associated with longer disease duration (24.9 years vs 20.7 years, p=0.038) and with the positivity for HLA-B27, (69% vs 47.4%, p=0.006) and these variables were maintained in the multivariate analysis, after adjusting for other variables. Conclusion: The prevalence of uveitis in our cohort was 26%. It was significantly more frequent in patients HLA-B27 (+) and with longer disease duration.

Estudio piloto de validación y adaptación de un cuestionario para evaluar el impacto de la espondiloartritis axial en la sexualidad de los pacientes / A validation and adaptation pilot study of a questionnaire to evaluate the impact of axial spondyloarthritis in the sexuality of patients

Introducción: El Qualisex es un cuestionario desarrollado y validado para evaluar la sexualidad en pacientes con artritis reumatoidea. Hasta el momento, según nuestro conocimiento, no se ha desarrollado un cuestionario que evalúe específicamente la sexualidad en pacientes que padecen Espondiloartritis axial (EsPax). Por este motivo, nuestro objetivo fue validar y adaptar el cuestionario Qualisex en pacientes con EsPax y evaluar el impacto de su enfermedad en la sexualidad. Material y métodos: Estudio de corte transversal. Se incluyeron pacientes ≥21 años de edad con diagnóstico de EsPax según criterios ASAS '09, en forma consecutiva. Se consignaron datos sociodemográficos, tiempo de evolución de la enfermedad, síntomas relacionados con la enfermedad, comorbilidades y tratamiento recibido. Se evaluó la salud sexual de los pacientes utilizando el cuestionario Qualisex. El mismo consta de 10 preguntas con respuestas categorizadas en una escala de 11 puntos (0-10); el resultado surge del promedio de las mismas y su rango es de 0-10, las puntuaciones más altas indican un mayor impacto en la sexualidad. La versión original del Qualisex fue traducida y adaptada para EsPax. Para el análisis estadístico, se utilizó estadística descriptiva, test de Mann-Whitney y test de Chi² y test exacto de Fisher. Regresión lineal. Correlación de Spearman. Coeficiente de correlación intraclase (CCI) para evaluar la reproducibilidad del cuestionario. Resultados: Se invitó a participar a 61 pacientes, 11 de los cuales se negaron. 50 pacientes fueron incluidos, 40 (80%) eran de sexo masculino, con una edad mediana de 47 años (RIC 21-72), y un tiempo mediano de evolución de 13 años (RIC 1-46). La mediana de Qualisex fue de 2,5 (RIC 1,1-4,2), el tiempo mediano para completar el cuestionario fue de 2,1 minutos (RIC 1,7-3,1). La reproducibilidad fue excelente con un CCI de 0,99 (IC 95% 0,65-1). Se hallaron algunas preguntas redundantes con correlación intraítem mayor a 0,8. El Qualisex presentó buena correlación con las medidas de evaluación de la enfermedad: ASQoL (Rho: 0,52, p=0,001), BASDAI (Rho: 0,57, p<0,0001), BASFI (Rho: 0,53, p=0,001), PsAQoL (Rho: 0,69, p=0,01). El Qualisex fue significativamente mayor en el sexo femenino (5,4 en mujeres vs 2,5 en varones, p=0,02), en los desocupados (4,7 en desocupados vs 2,3 ocupados, p=0,01), en pacientes con mayor actividad de la enfermedad evaluado por BASDAI >4 (4,2 pacientes activos vs 1,6 en pacientes inactivos, p=0,01) y menor en los pacientes en tratamiento biológico (TB) (1,9 con TB vs 3,8 sin TB, p=0,01). En el análisis multivariado, sexo femenino, mayor tiempo de evolución de la enfermedad y mayor actividad de la enfermedad se mantuvieron independientemente asociadas a mayor impacto en la sexualidad. Conclusión: El Qualisex adaptado a EsPax es un cuestionario válido y confiable, aunque presenta algunas preguntas redundantes. Los pacientes con EsPax de sexo femenino, con mayor tiempo de evolución y mayor actividad de la enfermedad presentaron peor calidad de vida sexual.

Introduction: The Qualisex is a questionnaire developed and validated to evaluate sexuality in patients with Rheumatoid Arthritis. According to our knowledge, a questionnaire that specifically assesses sexuality in patients with axial spondyloarthritis (AxSpA) has not been developed. For this reason, our objective was to validate and adapt the Qualisex questionnaire in patients with AxSpA and evaluate the impact of their disease on sexuality. Material and methods: Cross-sectional study. We included patients ≥21 years of age with a diagnosis of AxSpA according to ASAS '09 criteria. Sociodemographic data were recorded, time of evolution of the disease, symptoms related to the disease, comorbidities and treatment received. The sexual health of the patients was evaluated using the Qualisex questionnaire. It consists of 10 questions with answers categorized on a scale of 11 points (0-10). Qualisex's score is the mean of the results for the 10 questions, the highest scores indicate a greater impact on sexuality. The original version of the Qualisex was translated and adapted for AxSpA. For the statistical analysis, descriptive statistics, Mann-Whitney test and Chi² test and Fisher's exact test were used. Linear regression. Spearman correlation. Intraclass correlation coefficient (ICC) was used to evaluate the reproducibility of the questionnaire. Results: 61 patients were invited to participate, 11 of whom refused. 50 patients were included, 40 (80%) were male, with a median age of 47 years (IR 21-72), and a median time of evolution of 13 years (IR 1-46). The median of Qualisex was 2.5 (IR 1.1-4.2), the median time to complete the questionnaire was 2.1 minutes (IR 1.7-3.1). Reproducibility was excellent with a ICC of 0.99 (95% CI 0.65-1). Some redundant questions were found. The Qualisex presented good correlation with the evaluation measures of the disease: ASQoL (Rho: 0.52, p=0.001), BASDAI (Rho: 0.57, p<0.0001), BASFI (Rho: 0.53, p=0.001), PsAQoL (Rho: 0.69, p=0.01). The Qualisex was significantly higher in the female sex (5.4 in women vs 2.5 in males, p=0.02), in the unemployed (4.7 in unemployed vs 2.3 occupied, p=0.01), in patients with greater activity of the disease evaluated by BASDAI >4 (4.2 active patients vs 1.6 in inactive patients, p=0.01) and lower in patients on biological treatment (BT) (1.9 with BT vs 3.8 without BT, p=0.01). In the multivariate analysis, female sex, longer time of evolution of the disease and greater activity of the disease were independently associated with greater impact on sexuality. Conclusion: The Qualisex adapted to AxSpA is a valid and reliable questionnaire, although it presents some redundant questions. The patients with AxSpA of female sex, with longer time of evolution and greater activity of the disease presented worse quality of sexual life.

Validación del índice compuesto DAPSA (Disease Activity for Psoriatic Arthritis) en una cohorte de pacientes con artritis psoriásica en Argentina y determinación de sus valores de corte / Validation of the composite index DAPSA (Disease Activity for Psoriatic Arthritis) in a cohort of patients with psoriasis arthritis in Argentina and determination of their cut-off values

Objetivos: Validar el índice DAPSA en pacientes con Artritis Psoriásica (APs) en Argentina, comparar su rendimiento con índices compuestos y con la ultrasonografía (US) y establecer valores de corte. Materiales y Métodos: Se incluyeron pacientes con APs según criterios CASPAR. En 10 pacientes se realizó recuento ecográfico de articulaciones tumefactas (66) y se calculó un DAPSA ecográfico. Para establecer valores de corte se realizó la valoración de los estados de actividad de la enfermedad por 10 reumatólogos a través 20 casos hipotéticos de pacientes con APs y según los valores de corte del SDAI. Resultados: Se incluyeron 112 pacientes. DAPSA m14,3 (RIC 7-22,4). DAPSA presentó muy buena correlación con DAS28 (Rho:0,85), IAS (Rho:0,94), CDAI (Rho:0,95), SDAI (Rho:0,94) y N° de articulaciones dolorosas (Rho:0,84). DAPSA ecográfico m10,6 (RIC 8,5-17,9) presentó muy buena correlación con DAPSA (Rho:0,94). Usando los valores de corte del SDAI, elaboramos curvas ROC para establecer los valores de corte del DAPSA: ≤3,5 remisión, >3,5 a ≤13,4 baja, >13,4 a ≤26,2 moderada y >26,2 alta actividad (sensibilidad y especificidad ≥90%, área bajo la curva de 98%). Conclusión: Los valores de corte propuestos permitieron definir los diferentes estados de actividad de la enfermedad con muy buena sensibilidad y especificidad.

Objective: To validate DAPSA in patients with PsA in Argentina, evaluate its performance using other indexes, the ultrasound and establish tentative cut-off values according to disease activity. Methods: Patients with PsA according to CASPAR criteria. DAS28, DAPSA, SDAI, CDAI, and CPDAI were calculated. In 10 patients we assessed swollen joints (66) by ultrasound and calculated an ultrasound DAPSA. We tried to establish cut-off values through: the assessment of disease activity states by 10 rheumatologists through 20 hypothetical cases of patients with PsA and according to SDAI cut-off points. Finally, we validated DAPSA cut-off values in the RAPSODIA cohort. Results: We included 112 patients. DAPSA m14.3 (IQR 7-22.4). DAPSA had excellent correlation with DAS28 (Rho:0.85), CDAI (Rho:0.95), SDAI (Rho:0.94) and tender joint count (Rho:0.84). Ultrasound DAPSA m10.6 (IQR 8.5-17.9), it had excellent correlation with DAPSA (Rho:0.94). Using established cut-off values for SDAI, we performed ROC curves for DAPSA's cut-off values: ≤3.5 remission, >3.5 to ≤13.4 low, >13.4 to ≤26.2 moderate, and >26.2 high disease activity (sensitivity and specificity ≥90%, area under the curve of 98%). Conclusion: With these cut-off values is possible to define different disease activity states with a very good sensitivity and specificity.

Adecuación del manejo diagnóstico del traumatismo craneoencefálico leve en menores de 24 meses a las guías de práctica clínica de PECARN y AEP / Compliance with the PECARN and AEP guidelines in diagnostic approach of mild head trauma in patients younger than 24 months old

INTRODUCCIÓN: El traumatismo craneoencefálico leve es una causa común de atención en Urgencias Pediátricas. En los últimos años se han publicado diversos protocolos y guías de manejo de estos pacientes, pero aún existe una amplia variabilidad, especialmente en lo que a la realización de pruebas de imagen se refiere. El objetivo de este estudio es analizar el grado de concordancia del manejo de los pacientes menores de 24 meses a la guía clínica de la PECARN y al protocolo de la AEP en 4 centros diferentes. PACIENTES Y MÉTODOS: Estudio retrospectivo multicéntrico en el que se analiza a pacientes atendidos por traumatismo craneoencefálico leve entre el 1 de octubre del 2011 y el 31 de marzo del 2013 en los Servicios de Urgencias de 4 hospitales. RESULTADOS: Al analizar la concordancia del manejo de los pacientes con el protocolo de la AEP vemos que tan solo uno de los centros supera el 50% de los pacientes con un manejo acorde con el mismo. Los otros 3 centros mostraron un grado de concordancia inferior a esta cifra. El manejo sí es más adecuado para los estándares de las guías clínicas de PECARN, superando 3 de los centros el 50%, aunque el hospital con mejores cifras presentó un 70% solamente. CONCLUSIONES: Nuestro estudio muestra que la concordancia con las recomendaciones de las guías clínicas en el manejo del traumatismo craneoencefálico leve en los menores de 2 años es, en general, baja

INTRODUCTION: Mild head trauma is a frequent complaint in Pediatric Emergency Departments. Several guidelines have been published in the last few years. However, significant variability can be appreciated in terms of the demand for image tests. The aim of this study is to determine the level of compliance with PECARN and AEP guidelines in the management of patients younger than 24 months old in four different hospitals. PATIENTS AND METHODS: A multicenter retrospective study was conducted on patients presenting with mild head trauma between October 1st, 2011 and March 31st, 2013 in the Emergency Departments of four hospitals. RESULTS: In the analysis of the results obtained, only one of the four hospitals complied with the AEP guidelines in more than 50% of the patients. The other three hospitals had a level of compliance lower than 50%. Management was more suitable according to PECARN guidelines, with 3 of the 4 hospitals having a level of compliance greater than 50%. However, the best compliance achieved by a hospital was only of 70%. CONCLUSIONS: The study shows that the level of compliance with guidelines for management of mild head trauma in patients younger than 24 months old is low

Effect of surface roughness and sterilization on bacterial adherence to ultra-high molecular weight polyethylene.

Sterilization with ethylene oxide (EO) and gas plasma (GP) are well-known methods applied to ultra-high molecular weight polyethylene (UHMWPE) surfaces in the belief that they prevent major material changes caused by gamma irradiation. However, the influence of these surface sterilization methods on bacterial adherence to UHMWPE is unknown. UHMWPE samples with various degrees of roughness (0.3, 0.8 and 2.0 µm) were sterilized with either GP or EO. The variations in hydrophobicity, surface free energy and surface functional groups were investigated before and after sterilization. Sterilized samples were incubated with either Staphylococcus aureus or Staphylococcus epidermidis in order to study bacterial adherence to these materials. Fewer bacteria adhered to UHMWPE after sterilization with EO than after sterilization with GP, especially to the smoothest surfaces. No changes in chemical composition of the UHMWPE surface due to sterilization were observed using X-ray photoemission spectroscopy analysis. The decreased bacterial adherence to UHMWPE found at the smoothest surfaces after sterilization with EO was not directly related to changes in chemical composition. Increased bacterial adherence to rougher surfaces was associated with increased polar surface energy of EO-sterilized surfaces.

Dermatitis de contacto por el uso de aparatos ortodóncicos extraorales. A propósito de 3 casos / Contact dermatitis associated with the use of extraoral orthodontic appliances: a presentation of 3 cases

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Clinical significance and epidemiology of non-pigmented rapidly growing mycobacteria in a university hospital.

OBJECTIVES: To study the clinical significance and epidemiology of Non-pigmented rapidly growing mycobacteria (NPRGM) during a 13-year period. METHODS: We performed a retrospective study of patients with isolates of NPRGM to evaluate their clinical significance. We also analyzed the strains using Randomly Amplified Polymorphic DNA (RAPD) analysis to evaluate the relationship between strains. RESULTS: Between 1990 and 2003, 65 patients had an isolate of NPRGM. Twenty of them were considered significant (19 cases) or doubtful (1 case). Many cases were skin and soft tissue infections. Six cases were foreign-body related. All the patients recovered with antibiotic therapy and removal of the foreign body. All the patients were apparently unrelated, despite 56.9% of the isolates were detected between 1995 and 1997. RAPD analysis was performed on 43 strains, and showed only a cluster of two Mycobacterium chelonae isolates. Both of them were related with contamination of a laboratory reactive, and were considered non-significant. CONCLUSION: In our hospital, almost one-third of the isolates of NPRGM were significant, being this percentage higher for skin and soft tissue isolates. Patients were cured with antibiotic therapy, but the removal of foreign bodies appeared to be necessary for a good outcome. A minor pseudo-outbreak was detected. No predominant strain was detected.

[Optimization of the pertussis vaccine production process]. / Optimación del proceso de producción de la Vacuna Pertussis.

The production of Pertussis Vaccine was reevaluated at the Instituto Nacional de Higiene "Rafael Rangel" in order to optimise it in terms of vaccine yield, potency, specific toxicity and efficiency (cost per doses). Four different processes, using two culture media (Cohen-Wheeler and Fermentación Glutamato Prolina-1) and two types of bioreactors (25 L Fermentador Caracas and a 450 L industrial fermentor) were compared. Runs were started from freeze-dried strains (134 or 509) and continued until the obtention of the maximal yield. It was found that the combination Fermentación Glutamato Prolina-1/industrial fermentor, shortened the process to 40 hours while consistently yielding a vaccine of higher potency (7.91 +/- 2.56 IU/human dose) and lower specific toxicity in a mice bioassay. In addition, the physical aspect of the preparation was rather homogeneous and free of dark aggregates. Most importantly, the biomass yield more than doubled those of the Fermentador Caracas using the two different media and that in the industrial fermentor with the Cohen-Wheeler medium. Therefore, the cost per doses was substantially decreased.

[Risk factors for asthenopia among computer terminal operators]. / Factores de riesgo para la astenopía en operadores de terminales de computadoras.

OBJECTIVE: To study the incidence of asthenopia among computer terminal operators as compared to unexposed administrative workers and to identify the risk factors associated with this condition. MATERIAL AND METHODS: A sample of 35 computer terminal operators and 70 unexposed administrative workers from eight computing centers at an educational institution were included in the study. The risk factors studied were: lighting, contrast, type of lighting, screen type, electrostatic field, eye to monitor distance, time and number of hours worked, age, use of corrective lenses, seniority and overtime. Asthenopia was clinically identified as the presence of at least one sign and symptom present in a given workday. RESULTS: Asthenopia was found in 68.5% of the exposed group and in 47.7% of the unexposed group (p < 0.05). Among the risk factors studied, working for more than four hours at the video display terminal was shown to have a significant association with asthenopia (p < 0.05). CONCLUSIONS: A recommendation is made to take breaks during the workday at computer terminals in order to avoid visual fatigue. Also, more extensive studies should be carried out in our population to establish safety criteria and to standardize work activities using computer terminals.

Utilización de lopinavir/ritonavir en monoterapia / Use of lopinavir/ritonavir monotherapy

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Diseño de una cefalometría tridimensional con la tomografía computarizada de haz cónico (CBCT ) / No disponible

Introducción: el uso de los CBCT se está imponiendo actualmente en los pacientes ortodóncicos ya que estos sistemas suponen una alternativa a la radiografía convencional y a la tomografía computarizada(TC). Objetivos: Definir una serie de planos de referencia y medidas lineales y diseñar una cefalometría en tres dimensiones que incluya un análisis esquelético, de asimetrías, de proporciones craneofaciales y dentoalveolar. Conclusiones: En el presente estudio se muestra una cefalometría sencilla en tres dimensiones, que puede servir para poder medir directamente a nuestros pacientes en los cortes y en la reconstrucción tridimensional obtenidas con un equipo CBCT, sin necesidad de emplear la telerradiografía convencional (AU)

Introduction: The use of CBCT is currently imposing on orthodontic patients because these systems offer an alternative to conventional radiography and computed tomography (CT). Objectives: Define a set of reference planes and linear measurements and design a three-dimensional cephalometric analysis including a skeletal analysis, an analysis of asymmetries, a craniofacial relationships analysis and adentoalveolar analysis. Conclusions: This study shows a simple three-dimensional cephalometry, which can serve to measure directly our patients with CBCT equipment, without using conventional teleradiography (AU)