Ricardo Guedes

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Morphological and chemical studies on the cuticle during the molt cycle of the crab Scylla serrata were performed in order to understand the layer formation. Cuticle ultrastructure was studied by scanning electron microscopy (SEM). Energy-dispersive, X-ray diffraction, and X-ray fluorescence analysis were used for identification of the elements and phases(More)
INTRODUCTION Nonpenetrating deep sclerectomy with external trabeculectomy has been proved to be an effective alternative to classic trabeculectomy for surgical treatment of primary open-angle glaucoma. However, this procedure is not well known nor well accepted among Brazilian ophthalmic surgeons. The aim of this study was to assess the results and success(More)
PURPOSE To identify factors related to non-penetrating deep sclerectomy (NPDS) failure in controlling intraocular pressure (IOP). METHODS A case-control study was performed through a logistic regression modelling. All cases and controls had at least 2 years of follow-up. Cases comprised eyes that had undergone an NPDS and presented an end-point IOP > 18(More)
PURPOSE To assess and compare the impact of medical and surgical glaucoma treatments on patients' health-related Quality of Life (QoL). MATERIALS AND METHODS We used the 25-question version of the National Eye Institute Visual Functioning Questionnaire (NEI VFQ-25) for this cross-sectional study. Patients were divided into 3 groups: 1 (medical treatment);(More)
In this article we investigate Multi-agent simulation as a way for modeling strategies for resource allocation problems in Public Safety. The goal is to show how simulation can be used to help law enforcement authorities to evaluate, in a controlled environment, different strategies for allocating and dispatching resources, aiming at reducing both response(More)
PURPOSE To assess the quality of life of glaucoma patients under medical therapy with different prostaglandin analogs. METHODS A cross-sectional study of consecutive glaucoma patients was designed. We assessed the patients' quality of life through the Brazilian 25-question version of the National Eye Institute Visual Functioning Questionnaire, comprising(More)
PURPOSE Non-penetrating deep sclerectomy (NPDS) has emerged as a viable option in the surgical management of open-angle glaucoma. Our aim is to assess the cost-effectiveness of NPDS and to compare it to maximum medical treatment in a 5-year follow-up. METHODS A decision analysis model was built. Surgical (NPDS) arm of the decision tree was observational(More)
BACKGROUND AND OBJECTIVE Phaco non-penetrating deep sclerectomy (PhacoNPDS) is an option to simultaneously treat cataract and glaucoma. The authors assessed tensional success of PhacoNPDS and NPDS up to 3 years of follow-up. PATIENTS AND METHODS A longitudinal consecutive retrospective study was conducted comparing 376 eyes undergoing NPDS (group 1) and(More)
Recently, many discussions occurred concerning non-penetrating filtering surgery. Viscocanalostomy and deep sclerectomy with external trabeculectomy are the most practiced techniques. Their goal is to reduce intraocular pressure by enhancing the natural aqueous outflow, while reducing its resistance. Both techniques involve the removal of a deep scleral(More)
In this article we investigate Multi-agent simulation and Multi-objective Evolutionary Algorithms for optimizing resource allocation in Public Safety. We describe a tool that helps Law Enforcement authorities to evaluate, in a controlled environment, different strategies for allocating and dispatching resources, aiming at reducing conflicting goals such as(More)