Complications from the use of intravenous gadolinium-based contrast agents for magnetic resonance imaging

Os agentes de contraste à base de gadolínio são muito mais seguros que o contraste iodado, no entanto, existem complicações que devem ser reconhecidas, para orientação e tratamento adequados. A incidência total de reações adversas aos meios de contraste em ressonância magnética varia entre 2% e 4%. Casos de reações adversas agudas maiores ao gadolínio, como laringoespasmo e choque anafilático, são raros. As complicações crônicas com o uso do gadolínio também existem e, recentemente, foi descrita associação entre seu uso e uma doença dermatológica rara que ocorre em pacientes com insuficiência renal. A fibrose nefrogênica sistêmica foi tema de anúncio público oficial pela agência americana de regulação de drogas, a Food and Drug Administration. Esta doença progressiva caracteriza-se pelo espessamento e endurecimento da pele e fibrose, que podem acometer outras partes do corpo. Os pacientes que desenvolveram esta complicação apresentavam insuficiência renal crônica, estavam em acidose metabólica e foram submetidos a angiografia por ressonância magnética, provavelmente com injeção de grande volume de contraste paramagnético. Esta revisão tem o objetivo de apresentar uma descrição sucinta dos tipos de meios de contraste à base de gadolínio, possíveis complicações e medidas para prevenção e tratamento destas.Gadolinium-based contrast agents are much safer than the iodinated ones; however complications may occur and should be recognized for appropriate orientation and management. The total incidence of adverse reactions to contrast agents in magnetic resonance imaging ranges between 2% and 4%. Cases of severe acute reactions to gadolinium, such as laryngospasm and anaphylactic shock, are rare. Chronic complications secondary to the use of gadolinium also can occur and, recently an association between its use and a rare dermatologic disease occurring in patients with renal failure has been reported. Nephrogenic systemic fibrosis was the subject of an official health notification issued by the American Food and Drug Administration. This progressive disease is characterized by hardened skin with fibrotic nodules and plaques which may involve other parts of the body. Patients who have been affected by this disorder presented chronic renal failure, with metabolic acidosis and had been submitted to magnetic resonance angiography, probably involving exposure to large amounts of intravenous paramagnetic contrast. This review is aimed at presenting a succinct description of the gadolinium-based contrast agent types, possible secondary complications, their preventive measures and management

Odonate Communities of the Sucupira Reservoir, Rio Uberabinha, Minas Gerais, Brazil

Dragonflies and damselflies (Insecta: Odonata) are widely distributed among freshwater ecosystems of tropical and temperate environments. They are also particularly sensitive to anthropogenic changes. The objective of this study was to inventory the odonate fauna of a section of the Sucupira Reservoir on Rio Uberabinha, Uberlândia, Minas Gerais, Brazil, and to document the species composition of the odonate fauna during the dry and rainy seasons. The study also aimed to describe the distribution of the sampled species in Brazilian states. Sampling took place in August and September of 2017 (dry season) and in February and March of 2018 (rainy season), and recorded 860 individuals of 43 species belonging to 26 genera and six families. Six new records representing the families Gomphidae, Libellulidae and Coenagrionidae were recorded for the state of Minas Gerais. Seventeen species were collected only during the rainy season and eight only during the dry season, while 18 species were found in both seasons. The rainy season had greater abundance, with four times as many individuals as the dry season. This study increases the number of records for Odonata in the Minas Gerais state, and reinforces the trend for greater predominance of this group during the rainy season in this biome

Odonate Communities of the Sucupira Reservoir, Rio Uberabinha, Minas Gerais, Brazil

Dragonflies and damselflies (Insecta: Odonata) are widely distributed among freshwater ecosystems of tropical and temperate environments. They are also particularly sensitive to anthropogenic changes. The objective of this study was to inventory the odonate fauna of a section of the Sucupira Reservoir on Rio Uberabinha, Uberlândia, Minas Gerais, Brazil, and to document the species composition of the odonate fauna during the dry and rainy seasons. The study also aimed to describe the distribution of the sampled species in Brazilian states. Sampling took place in August and September of 2017 (dry season) and in February and March of 2018 (rainy season), and recorded 860 individuals of 43 species belonging to 26 genera and six families. Six new records representing the families Gomphidae, Libellulidae and Coenagrionidae were recorded for the state of Minas Gerais. Seventeen species were collected only during the rainy season and eight only during the dry season, while 18 species were found in both seasons. The rainy season had greater abundance, with four times as many individuals as the dry season. This study increases the number of records for Odonata in the Minas Gerais state, and reinforces the trend for greater predominance of this group during the rainy season in this biome

A Proposal for Computer use in Mathematics Classes: Algebra Teaching in College

O presente trabalho é baseado no ensino de matemática, especialmente no ensino de álgebra nos cursos de matemática da faculdade. O tema mencionado é o Grupo de Estrutura da Fábrica, existem pesquisadores no Brasil que se destacam como dificuldades dos alunos em entender o tópico. Com isso, os alunos acham difícil associar o ensino de álgebra ao software Dynamic Geometry, em particular o "GeoGebra". Propõe-se a um planejamento didático da sessão, nenhum professor qualificado realiza o "GeoGebra" para o ensino da Estrutura Algébrica do Grupo. Para realizar essa proposta de ensino, é criada a Sequência Fedathi. O uso de "GeoGebra" nas aulas de Álgebra é sugerido

O PAPEL DO MONITOR NA DISCIPLINA MINERALOGIA MICROSCÓPICA DO CURSO DE GEOLOGIA

A participação de estudantes graduandos no processo da efetiva construção do conhecimento científico tem aumentado muito nos últimos tempos (SEVERINO, 2014). Nesse contexto, o presente trabalho tem como objetivo apresentar como ocorreu o desenvolvimento da monitoria da disciplina Mineralogia microscópica (2016.4) do curso de Geologia, do Instituto de Geociências e Engenharias da Unifesspa, abordando os principais materiais e métodos utilizados, bem como explorando a relação entre os monitores a professora e os alunos e, por fim, abordar os resultados oriundos dessa monitoria para os envolvidos, principalmente o monitor