Resumen Justificación: Las uveítis no infecciosas constituyen una importante causa de pérdida visual a nivel mundial; por su complejidad y gravedad de complicaciones requieren un abordaje temprano y multidisciplinario. En Costa Rica se desconoce hasta el momento la incidencia global de estas entidades y todavía no existe ningún consenso en cuanto a su manejo. Objetivos: Resumir las recomendaciones terapéuticas vigentes para uveítis no infecciosas en adultos y ofrecer una guía adaptada a la realidad costarricense. Métodos: Se efectuó una revisión no sistemática de bibliografía médica indexada en las plataformas PubMed y Scielo, sobre el manejo médico de las uveítis no infecciosas. De igual manera, se compararon los esquemas terapéuticos recomendados actualmente en América y Europa con el abordaje realizado en los centros hospitalarios costarricenses, para crear una guía adaptada a la realidad nacional. En la elaboración de estas recomendaciones participaron médicos especialistas de todas las clínicas multidisciplinarias especializadas en uveítis del país. Conclusiones: En Costa Rica se cuenta con la mayoría de las opciones disponibles para el tratamiento de uveítis idiopáticas en el sistema público de salud. Se logró la creación de algoritmos de tratamiento para las diferentes patologías.

Summary Background: Noninfectious uveitis represents an important cause of visual loss worldwide, which in view of the severity and complexity of complications demands an early and multidisciplinary approach to therapy. In Costa Rica there is no statistical records of incidence nor consensus of management of these entities to this date. Objectives: To summarize the therapeutic recommendations for non-infectious uveítis according to the scientific evidence and adapt them to the Costa Rican conditions. Methods: A non-systematic review of medical literature indexed on PubMed and Scielo, concerning medical and surgical management of non-infectious uveitis was carried out. Likewise, the recommended therapeutic schemes in America and Europe were compared to the approach used in the Costa Rican hospital centers. In the elaboration of these recommendations participated physicians, specialists of all multidisciplinary clinics for uveitis of the country. Conclusions: In Costa Rica, the majority of alternatives available for the treatment of idiopathic uveitis in the public health system are available. It was possible to create therapeutic algorithms for the different diseases.

Background: The osmotic fragility (OF) test is one of the most suitable procedures to determine the resistance of the erythrocyte membrane under conditions of osmotic stress. One of the most frequent clinical uses of the FO test is the diagnosis of hereditary conditions that affect erythrocytes: thalassemia and spherocytosis. Both conditions induce red blood cells (RBCs) to be prone to swelling and then lyse under osmotic stress faster than those RBCs without any pathology. Since the standard OF test is time consuming and needs specialized equipment, a fast, accessible, and reliable technique is necessary to determine the OF. Objective: The objective of the study was to evaluate an alternative technique to determine the OF of erythrocytes by refractive index (RI) measurements. The method consists of measuring the real part of the RI of dilutions of whole blood samples with hypotonic solutions at different NaCl concentrations, ranging from 0% to 0.9% using a standard Abbe refractometer. Materials and methods: An experimental study was carried out with volunteers who went to the General Hospital of Mexico "Eduardo Liceaga." Peripheral blood samples from 12 healthy volunteers were used through the standard blood draw procedure and stored in a heparinized vacutainer tube. Results and conclusions: The proposed technique that uses an Abbe refractometer to measure the infrared of different solutions of whole blood and hypotonic solutions to determine the OF curve has proven to be simpler and more robust than the standard method based on the measurement of light absorption in dilutions of hemolyzed blood. The determination of the OF of erythrocytes rapidly and straightforwardly can be useful in the detection of specific pathologies.

Resumen Justificación y objetivos: El uso de fármacos antagonistas del factor de necrosis tumoral alfa se asocia a infecciones severas en artritis reumatoide, con una alta morbi-mortalidad en la práctica clínica. No existe casuística publicada respecto al tema en nuestro país. Se pretende aportar información relacionada con la epidemiología local de las infecciones severas e identificar factores de riesgo asociados. Métodos: Estudio observacional retrospectivo, que incluyó 50 pacientes tratados al menos un año en el periodo 2006-2012. Se evaluaron las características demográficas, así como las clínicas y epidemiológicas de la(s) infección(es) severa(s) desarrollada(s) y los factores de riesgo asociados. Resultados: La mayor parte de los pacientes fueron mujeres en edad media. Solo se documentó una infección severa, que correspondió a una infección de piel y tejido blando que resolvió con terapia antibiótica intravenosa. Se registraron factores de riesgo, especialmente en uso de terapia inmunosupresora esteroidal y el antecedente quirúrgico reciente, con una baja prevalencia de comorbilidades. Conclusiones: El perfil demográfico, así como el perfil clínico de las infecciones severas es similar a otras poblaciones, la baja incidencia de éstas en la cohorte podría relacionarse a una menor prevalencia de comorbilidades, no obstante se requiere investigaciones futuras para corroborar o descartar dicha observación.

Abstract Aim and objetives: The use of tumour necrosis factor alpha therapy antagonist leads to an increased risk of serious infections in rheumatoid arthritis, with a high morbi-mortality in clinical practice. There are no published data in our country. This study pretends to provide knowledge about the local epidemiology of serious infections and to identify associated risk factors. Methods: An observational and retrospective study, included 50 patients treated at least for one year between 2006-2012. Demographic characteristics, clinical and epidemiological characteristics of serious infections and risk factors associated with serious infections were described. Results: A predominant female population in middle age was detected. Just one serious infection was described, corresponding to serious skin and soft tissue infection that resolved with intravenous antibiotics. Risk factors were described including inmunosuppresive therapy with steroids and prior surgery. Conclusions: Demographic profile of analized population and their clinic profile of serious infectios are similar to others populations. Low incidence of serious infections in this cohort could be related with less comorbilities than others populations, although, this topic needs further investigations to corroborate or discard this observation.