Abstract The use of controlled extension flows associated with processing with predominant shear flows can bring gains in the dispersive capacity of nanofillers during the processing of nanocomposites. In this work, we use a controlled flow device coupled to the matrix of a single-screw extruder to process PP matrix composites containing 0.5% and 2.5% (v/v) of MWCNT. The nanocomposites were evaluated by optical microscopy and oscillatory rheological analysis. The clusters size analysis showed that in PP/0.5MWCNT-el, 70.5% of all its clusters were below 1µm2 while its analog processed without the extensional flow showed 59.8% of its clusters below this value. The rheological analysis allowed to verify that the compositions processed with the presence of the extensional flow have their crossover frequencies shifted to lower values, that is, longer relaxation times corroborating that improved degrees of dispersion were achieved.

Abstract The structure and properties of semi-crystalline polymers can be drastically tailored by extensional flows. In this work, polypropylene (PP), Polyvinylidene fluoride (PVDF) and Low Density Polyethylene (LDPE) were melt extruded through a sequence of rings designed to apply controlled extensional flows in the polymer melts. The effects of extensional flow on the structure and properties of the extruded filaments were then evaluated by mechanical tensile tests, dynamic-mechanical analysis (DMA) and Differential Scanning Calorimetry (DSC). The DMA and tensile tests revealed a significant increase in terms of static and dynamic moduli for the polymers extruded through the extensional flow device. PP, PVDF and LDPE had their dynamic moduli enhanced 19%, 40% and 77%, respectively. These results were ascribed to the enhancement in crystallinity and orientation degree of the polymer chains induced by the extensional flow. The crystallinity was increased around 9% for PP, PVDF and LDPE extruded under extensional conditions.

RESUMO As nanoferritas mistas de Ni0,5Zn0,5Fe2O4 e Ni0,2Cu0,3Zn0,5Fe2O4 foram sintetizadas por reação de combustão usando ureia como combustível e um reator cônico como fonte de aquecimento para produção em bateladas de 10 g, e então, testadas como nanocatalisadores heterogêneos nas reações de transesterificação e esterificação metílica e etílica do óleo de soja para produção de biodiesel. Durante as sínteses foram registrados o tempo e a temperatura das reações, bem como observadas a liberação de gases e a cor das chamas emitidas. As amostras foram caracterizadas por DRX, EDX, FTIR, MEV/EDS, BET e cromatografia gasosa. Os testes reacionais foram executados para 10 g do óleo em duração de 1 h, razão molar 1:12 óleo:álcool, 2 % (m/m) de catalisador e conduzidas a 180 ºC. Os difratogramas de DRX e os espectros de FTIR revelaram presença da fase espinélio inverso tipo B(AB)2O4. A morfologia apresentou a formação de aglomerados de aspecto frágil e elevada área de superfície. As análises cromatográficas produziram excelentes resultados nas reações de esterificação para ambas amostras nas condições testadas, com destaque especial para Ni0,5Zn0,5Fe2O4, cujas conversões foram de 91,4 % em ésteres metílicos e de 77,8 % em ésteres etílicos, enquanto que a amostra Ni0,2Cu0,3Zn0,5Fe2O4 apresentou conversões de 75,1 e 65,1 %, respectivamente. As conversões na transesterificação metílica e etílica foram de 14 e 2 % para Ni0,5Zn0,5Fe2O4 e de 11 e 3 % para Ni0,2Cu0,3Zn0,5Fe2O4.

ABSTRACT The mixed nanoferrites of Ni0.5Zn0.5Fe2O4 and Ni0.2Cu0.3Zn0.5Fe2O4 were synthesized by combustion reaction using urea as fuel and a conical reactor as heating source in batches of 10 g, and then tested as heterogeneous nanocatalysts in the transesterification and esterification reaction of soya bean oil using the methyl and ethyl routes to biodiesel production. During the synthesis the time and temperature of the reactions were measured, and the evolved gases and the color of the emitted flames were observed. The samples were characterized by XRD, EDX, FTIR, SEM/EDS, BET and gas chromatography. The reaction tests were carried out with 10 g of oil for 1 h, oil:alcohol molar ratio of 1:12, 2 % (w/w) of catalyst, and conducted at 180 °C. The XRD patterns and the FTIR spectra revealed the presence of the inverse spinel phase type B(AB)2O4. The morphology showed the formation of agglomerates with fragile morphology and high surface area. The chromatographic analysis produced excellent results in the esterification reactions for both samples in the tested conditions, with special emphasis on Ni0.5Zn0.5Fe2O4, whose conversions were of 91.4 % in methyl esters and of 77.8 % in ethyl esters, while the Ni0.2Cu0.3Zn0.5Fe2O4 sample showed conversion of 75.1 and 65.1 %, respectively. The conversions in the methyl and ethyl transesterification were of 14 and 2 % of the Ni0.5Zn0.5Fe2O4 sample, and of 11 and 3 % for the Ni0.2Cu0.3Zn0.5Fe2O4 sample.

RESUMO Poliamida é uma família de termoplásticos utilizada na fabricação de peças com tolerância dimensional relativamente estreita, como engrenagens em produtos eletrônicos, pequenos filtros de combustíveis na indústria automobilística e etc. O controle dimensional está intimamente relacionado à contração que acompanha o processo de cristalização do polímero em peças moldadas por injeção. Assim, o propósito do presente trabalho foi determinar a constante de cristalização não-isotérmica de amostra de poliamida 66 empregando-se o Método da Curva Mestre visando seu emprego em conjunto com a equação de Nakamura para simulação do processo de solidificação na moldagem por injeção. Para tanto, experimentos de cristalização não isotérmica foram realizados em um Calorímetro Diferencial de Varredura, DSC, em várias taxas de resfriamento, na faixa de 5 a 40º C/min. As curvas originais de DSC foram corrigidas em termos da defasagem de temperatura entre a amostra e o forno do DSC antes da aplicação do método. A equação de Nakamura e a constante de cristalização não isotérmica obtida pelo método da Curva Mestre foram empregados para simular as curvas de cristalinidade relativa em função da temperatura para as diferentes taxas de resfriamento. Também foi avaliada a influência do uso de diferentes valores de cristalinidade relativa inicial nas simulações via modelo de Nakamura, análise esta normalmente não encontrada na literatura. As curvas geradas pela constante de cristalização calculada via Método da Curva Mestre apresentaram uma boa concordância com os dados experimentais para esta amostra de poliamida 66 usando-se 10-5 como cristalinidade relativa inicial para a forma diferencial da equação de Nakamura. Desse modo, o modelo de Nakamura, juntamente com sua constante determinada pelo Método da Curva Mestre, se mostrou uma boa opção para a simulação do processo de cristalização na moldagem por injeção de poliamida 66.

ABSTRACT Polyamide is a family of thermoplastics used for producing components with tight dimensional tolerance, such as gears for electronics products and small filters for fuels in the automotive industry. The dimensional control of these parts is intrinsically related to the contraction associated to the crystallization process during their injection molding . Therefore, the purpose of the present work was to calculate the non-isothermal crystallization constant of a polyamide 66 sample using the Master Curve Approach for simulation of processing. Non-isothermal crystallization experiments were carried out in a differential scanning calorimeter, DSC, at several cooling rates. The original DSC curves were corrected for the temperature lag between the sample and the DSC furnace. The Nakamura equation and the non-isothermal crystallization constant obtained by the Master Curve Approach were employed to simulate the curves of relative crystallinity as a function of temperature, for the different cooling rates. It was tested the influence of different initial relative crystallinity for the differential form of the Nakamura model. Such analysis is not frequent in literature. The generated curves presented good agreement with the experimental data for this polyamide sample, using 10-5 as the initial relative crystallinity. Therefore, this kinetic model in association with its non isothermal crystallization constant determined via Master Curve Approach showed to be a good option for simulation of the solidification process of the polyamide 66 during the injection molding.

We briefly investigated the well-known correlation of trihalomethanes, present in fresh water, with cancer hazard in humans. A transient alternative method of chemical simulation using Bäcklund Transformations and Quantum Mechanics is presented. Finally, the method was applied to simulate the interaction between Trichloridemethane and Alanine - as well as its amino and carboxyl groups.

The purpose of the present paper was to test the validity of the nonlinear regression method for calculating the non-isothermal crystallization rate constant of the Nakamura's model of a rotational molding grade LLDPE directly from non-isothermal crystallization experiments carried out in a single cell DSC. Cooling rates of 50, 40, 30, 20, 10 and 5 oC/min were used with samples of 3.0 mg under nitrogen atmosphere. Here, good agreement was observed between the experimental relative crystallinity curves and the simulated ones using the calculated parameters by nonlinear regression. It shows that this method can be used to determine the Nakamura's non isothermal rate constant for using in simulation of the cooling phase of rotational molding. In this paper it was used 10-3, 10-4 and 10-14 as the initial crystallinity in the Nakamura's model. However the best average results for all cooling rates was obtained when 10-4 was used. Average spherulitic dimensions of LLDPE studied in this paper did not change significantly with different cooling conditions.

No presente estudo o empenamento de peças de polietileno linear de baixa densidade (PELBD) moldadas por rotomoldagem foi investigado. O efeito de diferentes fatores como espessura da peça, taxa de resfriamento e diâmetro de tubo de ventilação foi avaliado. Além dos experimentos de rotomoldagem, uma técnica alternativa denominada "Hot Press" foi também aplicada para investigar o empenamento de dois diferentes PELBD sob condições típicas da rotomoldagem quanto ao resfriamento assimétrico. Cristalinidade e morfologia esferulítica ao longo da espessura das peças rotomoldadas foram avaliadas por Calorimetria Exploratória Diferencial (DSC) e Microscopia Ótica de Luz Polarizada. Verificou-se que o grau de empenamento aumenta com a taxa de resfriamento. O aumento do diâmetro do tubo de ventilação é mais efetivo na redução do empenamento principalmente em menores taxas de resfriamento. Nos experimentos de "Hot Press" o PELBD com menor índice de fluidez e maior módulo de flexão apresentou menor empenamento. Nos experimentos de "Hot Press" a espessura das peças afetou o empenamento somente para maiores taxas de resfriamento. Em geral, a cristalinidade e o tamanho de esferulitos se mostraram menores nas posições ao longo da espessura das peças rotomodadas onde as taxas de resfriamento eram mais rápidas.

In the present study the warpage of rotationally molded parts of a linear low density polyethylene (LLDPE) was investigated. The effect from different processing factors such as part thickness, cooling condition and diameter of the venting tube was evaluated. In addition to the rotational molding experiments, an alternative experimental technique, referred to as "Hot Press", was also applied to investigate the warpage of two different grades of LLDPE under typical rotational molding conditions, which means slow cooling from only one side. The crystallinity and spherulitic morphology along the thickness of the rotationally molded parts were studied by Differential Scanning Calorimetry and Polarized Light Optical Microscopy. It is shown that the warpage increases with increasing cooling rate. The increase in diameter of the venting tube is more effective in reducing the warpage of rotationally molded parts, especially for lower cooling rates. In hot press experiments the grade of LLDPE with lower melt flow index and higher flexural strength presented lower warpage. The part thickness affects the warpage in hot press experiments only for faster cooling rates. In general, crystallinity and spherulitic diameter are lower in positions along the cross section of the rotationally molded part where the cooling rate is faster.

Além dos graus-dia, vários são os sistemas de unidades bioclimáticas, embora sua utilização e limitação ainda sejam pouco conhecidas na cafeicultura. Diante disto, este trabalho objetivou avaliar o desempenho de quatro índices bioclimáticos para estimativa da duração dos subperíodos florescimento-fruto verde cana, fruto verde cana -fruto cereja e florescimento-fruto cereja, na cultura de café. Durante o ano agrícola 2008/2009 foram avaliados índice térmico, acúmulo da radiação fotossinteticamente ativa, índice heliotérmico de Geslin e acúmulo da evapotranspiração de referência, em dez cultivares de café plantadas em Uberlândia, MG. Os dados obtidos para cada índice bioclimático foram analisados através de estatística clássica, obtendo-se a média, o desvio padrão e o coeficiente de variação, em que este último parâmetro serviu de base para a escolha do índice bioclimático utilizado na quantificação da duração dos subperíodos de cada cultivar de café e na classificação do ciclo em precoce, médio e tardio. Verificou-se que os índices heliotérmico de Geslin e acúmulo da evapotranspiração de referência, apresentaram os menores coeficientes de variação médios entre as cultivares.

Besides degree-days, which considers air temperature, there are several bioclimatic unit systems. However, their use and limitation is little known for coffee crop. Therefore, this study evaluated the performance of four bioclimatic indices to estimate the length of the sub-periods flowering-light green fruit, light green fruit-cherry fruit and flowering-cherry fruit, in coffee crop. The thermal index, accumulation of photosynthetic active radiation, Geslin's heliothermic index and the accumulation of the reference evapotranspiration were evaluated during the agricultural year 2008/2009 for ten coffee cultivars, in Uberlândia-MG, Brazil. The data for each bioclimatic index were analyzed with the classical statistics, determining the mean, the standard error, and the coefficient of variation. This last parameter was the basis for the choice of the bioclimatic index used for the quantification of the length of the sub-periods for each coffee cultivar and for the classification of the cycle as early, medium and late. Geslin's heliothermic index and accumulation of the reference evapotranspiration presented the smallest mean coefficients of variation among the cultivars.

O melhoramento genético do cafeeiro mediante técnicas convencionais é trabalhoso e demorado. A biotecnologia oferece estratégias alternativas para auxiliar na multiplicação e no desenvolvimento de novas variedades com resistência a estresses bióticos e abióticos, melhor qualidade de bebida e maturação mais uniforme dos frutos. As técnicas de cultura de tecidos têm possibilitado a obtenção de grande número de plantas e a garantia da uniformidade genética do material. O emprego de marcadores moleculares, principalmente através da seleção assistida, facilitou o rápido progresso do melhoramento genético da cultura, assim como a transformação genética, via cultura e fusão de protoplastos, biobalística ou mediada por Agrobacterium sp. Esta revisão objetiva sumarizar o histórico, situação atual e perspectivas da biotecnologia no melhoramento genético do cafeeiro.

Genetic improvement of coffee through classical breeding is laborious and time consuming. Biotechnology offers alternative strategies to assist multiplication and development of new and improved coffee varieties, including those resistant to biotic and abiotic stresses, with better cup quality, and with uniform fruit maturation. Tissue culture techniques have enabled the production of a large number of plants with genetic uniformity. The use of molecular markers, especially through assisted selection, led to rapid progress of coffee plant breeding, as well as the use of genetic transformation by protoplasts culture and fusion, biobalistics, or Agrobacterium-mediated. This review provides a summary of biotechnology history, current situation and directions applied to the genetic improvement of coffee plant.

In the present work, non-isothermal crystallization data in the form of heat flow vs. temperature curves were generated using the Nakamura Model and its typical parameters reported in the literature for polypropylene. The values obtained for these curves were added to experimental baselines of a DSC to introduce typical noises in the calorimetric traces generated. The Master Curve Approach was applied by one of the authors to retrieve the non-isothermal crystallization rate constant for these simulated curves without information about the conditions used to generate these pseudo-experimental curves. Thus, the applicability of the Master Curve Approach was tested for data perfectly described by the Nakamura Model. With this procedure, the authors were able to check the sensitivity of the method to uncertainties in the determination of the induction time. The results showed good agreement between the pseudo-experimental curves and the curves simulated using the retrieved non-isothermal crystallization rate constant. However, this good agreement was only possible due to a compensation effect, because some of the parameters showed significant differences between the pseudo-experimental and retrieved values. Among these parameters are the pre-exponential factor of the non-isothermal crystallization rate constant, the temperature of the onset of the crystallization process, and the initial degree of crystallinity of the differential form of the Nakamura Model. These problems were not caused by the Master Curve Approach, but by inherent difficulties in the DSC analysis.

Neste trabalho, objetivou-se avaliar a qualidade das mudas de cafeeiro (Coffea arabica L.) produzidas em tubetes com substrato artificial suplementado com fontes de material orgânico em diferentes proporções. O experimento foi conduzido sob delineamento experimental de blocos casualizados em esquema fatorial 3 x 6, com quatro repetições em parcelas formadas por seis tubetes. O primeiro fator correspondeu às fontes de material orgânico (esterco bovino, húmus de minhoca e cama de peru) e o segundo, suas proporções (0, 20, 40, 60, 80 e 100%) no substrato artificial (BioPlant-café) fertilizado com osmocote® (NPK 15-09-12). As características avaliadas foram: altura da muda, diâmetro de caule, número de pares de folhas, área foliar e massa seca da parte aérea e do sistema radicular. Pode-se concluir que o húmus de minhoca adicionado ao substrato artificial na proporção de 80% ou em uso exclusivo (100%) aumentou a área foliar das mudas de cafeeiro e, como conseqüência proporcionou um maior acúmulo de massa seca da parte aérea. O uso de esterco bovino (acima de 30%) e a cama de peru não alterou ou reduziu as características vegetativas das mudas de cafeeiro (altura da muda, diâmetro de caule, número de pares de folhas e área foliar) e diminuiu o acúmulo de massa seca.

This work aimed to evaluate the quality of coffee seedlings (Coffea arabica L.) produced in small plastic containers with artificial substrate supplemented with sources of organic components in different proportions. The experiment was carried out using the randomized block design, in a 3 x 6 factorial structure, with four replications in plots composed of small plastic containers. The first factor corresponded to the sources (cattle manure, earthworm casting, and turkey manure) and the second to the proportions (0, 20, 40, 60, 80, and 100%) in the artificial substrate (BioPlant-café®) fertilized with osmocote® (NPK 15-09-12). The characteristics evaluated were: seedling height, seedling stem diameter, number of pair of leaves, leaf area, shoot dry matter and root system dry matter. This work concluded that the earthworm casting added to the artificial substrate in proportion of 80% or by itself (100%) increases the leaf area of coffee seedlings and, as a consequence it provides a higher accumulation of dry matter in the shoot. The use of cattle (up to 30%) and turkey manure did not modify or reduced seedling height, seedling stem diameter, number of pair of leaves as well as the leaf area and decreased the accumulation of dry matter.

Com o objetivo de avaliar os efeitos da utilização de diferentes materiais orgânicos no substrato artificial para a produção de mudas de cafeeiro (Coffea arabica L.) em tubetes, foi instalado em um viveiro comercial de produção de mudas, um experimento na Escola Agrotécnica Federal de Uberlândia - EAFU, no período de julho de 2005 a janeiro de 2006. Utilizou-se o delineamento experimental de blocos ao acaso, em esquema fatorial 3 x 6, com quatro repetições, sendo os fatores: três fontes de material orgânico (esterco de curral bovino curtido, cama de peru curtida e resíduo de fumo curtido) e seis proporções destes materiais no substrato artificial (0, 20, 40, 60, 80 e 100%). As parcelas foram constituídas por seis tubetes com capacidade volumétrica de 120 mL. Na fertilização dos substratos utilizou-se o fertilizante de liberação gradual (osmocote), fórmula NPK 15-09-12, aplicado em mistura homogênea na dose de 1 g do produto comercial por recipiente e como substrato artificial foi utilizado o produto comercial Bioplant-café. Foram avaliadas as características: altura da planta, diâmetro do caule, número de pares de folhas, área foliar, massa seca da parte aérea, do sistema radicular e total, além de relação raízes/parte aérea. Os dados obtidos foram submetidos à análise de variância, com aplicação do teste de F, considerando-se a significância nos níveis tradicionais de 5 e 1% de probabilidade e, para comparação das médias das fontes de material orgânico, aplicou-se o teste de Tukey, a 5% de probabilidade, enquanto que para as proporções do material orgânico procedeu-se à análise de regressão. Concluiu-se que a adição de 40% de cama de peru ao substrato artificial favoreceu o desenvolvimento das mudas do cafeeiro; o esterco bovino adicionado ao substrato artificial, independente de sua proporção prejudicou o desenvolvimento das mudas; o resíduo de fumo também prejudicou o desenvolvimento das mudas e a partir de 60% provocou a morte das plantas.

With the aim of evaluating the effect of the use of different organic materials on the standard substrate for the production of cofee seedlings (Coffea arabica L.) in small plastic tubes, an experiment was installed at a seedling production nursery at the Agrotechnical Federal School of Uberlândia, in the period of July of 2005 to January of 2006. The randomized block design was used, in a factorial scheme 3 x 6, with four replications, the factors being: three sources of organic material (mature bovine manure, mature turkey bed and mature tobacco residue) and six proportions of these materials in the original substrate (0, 20, 40, 60, 80 and 100%). The parcels were constituted by six small plastic tubes with volumetric capacity of 120 mL. In the fertilization of the substrate a slow-releasing fertilizer (osmocote) was used, with the formula NPK 15-09-12, applied in homogeneous mixture in the dose of 1 g of the commercial product per container and the commercial product Bioplant-coffee was used as standard substrate. The characteristics evaluated were: plant height, stem diameter, number of leaf pairs, leaf area, and root and shoot dry matter weight. All data were submitted to the analysis of variance, with application of the test of F, considering the significance in the traditional levels of 5% and 1% of probability and, for comparison of the averages of the sources of organic material, the test of Tukey was applied at 5% of probability, while the analysis of regression was performed to evaluate the proportions of the organic material. It was concluded that the addition of 40% of turkey bed to the standard substrate, regardless the mixture proportions, hindered seedling development; mature bovine manure added to the standard substrate, independently of its proportion, was prejudicial to the development of the seedlings; the tobacco residue was also prejudicial to the development of the seedlings and in the concentration higher than 60% it provoked the death of the plants.

O objetivo deste trabalho foi avaliar a produtividade e o rendimento das quatro primeiras safras de cafeeiro (Coffea arabica L.), cultivado sob lâminas de irrigação. O experimento foi conduzido na Fazenda Experimental do Glória, Uberlândia, MG. O delineamento experimental foi o de blocos ao acaso, com quatro repetições e oito tratamentos constituídos das lâminas de irrigação equivalentes a 0 (sem irrigação), 30, 60, 90, 120, 150, 180 e 210% da evaporação em tanque Classe A (ECA). O plantio foi realizado em janeiro de 2001, no espaçamento de 3,5x0,7 m. As parcelas foram constituídas por três linhas com oito plantas cada. Foi utilizado o sistema de irrigação por gotejamento, com emissores autocompensantes de vazão 3,5 L h-1. A produtividade máxima foi de 115 sacas ha-1, obtida com a lâmina de 164,1% da ECA. A reposição de 143% da ECA propiciou rendimento ótimo de 291,8 L de "café da roça" por saca beneficiada. O efeito das lâminas de irrigação sobre a produtividade e o rendimento depende do ano. A irrigação não ameniza a bienalidade da produção do cafeeiro, em relação às plantas cultivadas em sequeiro.

The objective of this work was to evaluate the productivity and yield of the first four crops of coffee plants (Coffea arabica L.) cultivated under irrigation levels. The experiment was carried out at Fazenda Experimental do Glória, in the County of Uberlândia, MG, Brazil. It was used the randomized blocks design, with eight treatments and four repetitions. The irrigation levels were 0 (without irrigation), 30, 60, 90, 120, 150, 180 and 210% of the evaporation measured in Class A tank (ECA). Planting took place in January 2001, at 3.5x0.7 m spacing. Plots consisted of three rows with eight plants each. A drip irrigation system was used, with self compensating drippers at 3.5 L h-1 flow. Maximum productivity was 115 sacks ha-1, obtained under 164.1% ECA. Replenishment of 143% ECA led to optimum yield 291.8 L of "farm coffee" per processed sack. The effect of irrigation levels on productivity and yield depends on the year. Irrigation does not mitigate the production biannuality of coffee plants, regarding plants cultivated without irrigation.

Due to the relevance of the critical cooling rate, Rc, for glasses, Barandiarán and Colmenero (BC) developed a method for calculating Rc as a function of the crystallization temperature on cooling obtained from thermal analysis. The critical cooling rate is obtained by the extrapolation method to conditions of infinity undercooling. However, for polymers, there is a strong reason for modifying the original BC method. In this case, the extrapolation must be extended only to the undercooling associated to the glass transition temperature, Tg, because no crystallization can occur below this temperature. Following this modified method (MBC) proposed by the present authors, the critical cooling rate for PP, PEEK, P10MS and PET were determined. The results showed that the new values are much lower than those obtained by the original BC method.

CONTEXTO: A trombose venosa profunda (TVP) é uma doença freqüente e grave. A profilaxia é o melhor meio para reduzir a sua incidência, diminuindo a morbimortalidade gerada por suas complicações. Na relação custo x efetividade, é melhor manter uma rotina profilática do que tratar a doença já instalada. OBJETIVO: Verificar se a profilaxia da TVP está sendo utilizada de maneira adequada e rotineira no Hospital Escola Doutor José Carneiro (HEJC), de Maceió (AL). MÉTODOS: Foi realizado um estudo transversal descritivo no HEJC durante o período de 6 meses. A amostra foi de 298 pacientes, de diferentes especialidades. Os dados foram coletados nos prontuários, divididos em clínicos (68,5%) e cirúrgicos (31,5%). Analisou-se, em cada paciente, como se procedeu a utilização da profilaxia para a TVP. Foram pesquisados fatores clínicos, medicamentosos e cirúrgicos para todos os pacientes e, com base nesses dados, foi realizada estratificação do risco conforme a classificação recomendada pela Sociedade Brasileira de Angiologia e Cirurgia Vascular (SBACV). O estudo estatístico foi realizado através do software SPSS, utilizando os testes qui-quadrado e de correção bivariada, considerando o valor de p < 0,05. RESULTADOS: Dos 298 pacientes analisados, 204 eram da clínica médica, onde 28,9% eram de baixo risco, 60,3% médio risco e 10,8% alto risco para TVP; e 94 pacientes eram da clínica cirúrgica, onde 43,6% apresentaram baixo risco, 52,1% médio risco e 4,3% alto risco. Apenas 23% dos pacientes do grupo clínico e 2,1% para o grupo cirúrgico receberam a profilaxia de forma adequada. CONCLUSÃO: Apesar da eficácia da profilaxia para a TVP já ter sido comprovada e difundida, em nosso meio ainda não atinge os níveis desejados de utilização.

BACKGROUND: Deep venous thrombosis (DVT) is a frequent and severe disease. Prophylaxis is the best means to reduce its incidence, lowering morbidity and mortality rates caused by its complications. In a cost-effectiveness ratio, it is better to maintain a prophylactic routine than to treat an established disease. OBJECTIVE: To verify whether DVT prophylaxis is being properly and routinely used at Hospital Escola Doutor José Carneiro (HEJC), in Maceió, Brazil. METHODS: A descriptive, cross-sectional study at HEJC was carried out for a 6-month period. The sample was composed of 298 patients within different specialties. Data were collected from medical records, and divided into clinical (68.5%) and surgical (31.5%). How DVT prophylaxis was performed was analyzed for each patient. Clinical, pharmacological and surgical factors were investigated for all patients. Based on these data, risk stratification was performed in accordance with the classification recommended by Sociedade Brasileira de Angiologia e Cirurgia Vascular. Statistical analysis was performed using software SPSS and the qui-square and bivariate correction tests, considering p value < 0.05. RESULTS: Of the 298 patients analyzed, 204 belonged to medical clinic, in which 28.9% were low risk, 60.3% average risk and 10.8% high risk for DVT; and 94 patients belonged to surgical clinic, in which 43.6% were low risk, 52.1% average risk and 4.3% high risk. Only 23% of patients in the clinical group and 2.1% in the surgical group were given adequate prophylaxis. CONCLUSION: Despite the efficiency of prophylaxis for DVT having been confirmed, it does not reach satisfactory levels in our country.