Retinal lesions are not typically found in reactive arthritis. However, a previous case report documented co-existing retinal detachment and reactive arthritis. We report here a similar case of a 32-year-old male patient with concurrent non-traumatic bilateral retinal detachment and HLA-B27 associated reactive arthritis after urogenital and gastrointestinal infections. Our report substantiates a potential rare association of retinal detachment and reactive arthritis.
This paper presents a methodology to select the parameters of a nonlinear controller using Linear Matrix Inequalities (LMI). The controller is applied to a robotic manipulator to improve its robustness. This type of dynamic system enables the robust control law to be applied because it largely depends on the mathematical model of the system; however, in most cases it is impossible to be completely precise. The discrepancy between the dynamic behaviour of the robot and its mathematical model is taken into account by including a nonlinear term that represents the model´s uncertainty. The controller´s parameters are selected with two purposes: to guarantee the asymptotic stability of the closed-loop system while taking into account the uncertainty, and to increase its robustness margin. The results are validated with numerical simulations for a particular case study; these are then compared with previously published results to prove a better controller performance.
Introducción: Debido a la alta prevalencia de la diabetes mellitus (DM), la retinopatía diabética se ha convertido en una de las causas más importantes de pérdida visual prevenible. Objetivos: Identificar las acciones requeridas para la prevención, diagnóstico y tratamiento de la retinopatía diabética en el primer y segundo nivel de complejidad del sistema de salud colombiano. Métodos: Se formularon cinco preguntas. Se realizó una búsqueda no sistemática en las bases de datos Medline, Embase y Cochrane Library. Se seleccionó la bibliografía susceptible de responder a las preguntas con énfasis en estudios secundarios (p. ej., metaanálisis y revisiones sistemáticas). La información se discutió en un panel multidisciplinario de expertos provenientes de las principales ciu- AbstRACtBackground: Given the high prevalence of diabetes mellitus (DM), diabetic retinopathy has become one of the most important causes of preventable visual loss. Objectives: To determine critical aspects for prevention, diagnosis, and treatment of patients with of diabetic retinopathy in the Colombian context. Methods: Based on a set of five clinical questions prioritized by an expert group, a non-systematic literature search in Medline, Embase and Cochrane Library databases was performed. Susceptible literature to answer the questions were selected with emphasis on secondary studies (eg, meta-analysis and systematic reviews). The information was discussed in a multidisciplinary panel of experts from the main cities of Colombia. Results: Patients with type 1 and 2 DM should Artículo especiAl
Purpose: Clinical features in a case of acute retinal necrosis are described as well as its diagnostic approach and response to early treatment. Methods: This is a descriptive and retrospective study case report of a 26 year old male patient who arrived to the emergency room with a three day history of sudden visual loss in the right eye (RE). At initial evaluation a visual acuity of hand movements in the RE, 20/15 in the left eye (LE) and a right relative afferent pupillary defect were found. Fundoscopy revealed profuse soft exudates and hemorrhages involving posterior pole, inferior hemiretina and superotemporal periphery. Infectious workup and fluoresceinic angiography were made and positive serologies for herpes virus types 1 and 2, without HIV, were found. A diagnosis of acute retinal necrosis was made and treatment with intravenous valgancyclovir for two weeks and intra-vitreous triamcinolone for severe vasculitis, was given. Then a 3 months treatment with oral antiviral agents was prescribed. Results: Patient’s evolution showed improvement with treatment and at two and a half months of follow up, visual acuity was 20/50 in the right eye, normal slit lamp examination, tonometry of 12 mm Hg and fundoscopy improved when compared to initial pictures.Conclusions: A high index of suspicion is needed for diagnosing ARN taking into account clinical findings. Prompt intravenous and intra-vitreous treatments are needed to achieve good clinical and functional outcomes and to avoid central nervous system complications.
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