16 research outputs found

    Dynamics of pulmonary venous flow in fetuses with intrauterine growth restriction

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    Made available in DSpace on 2019-09-12T16:53:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2015Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS)Fundo de Apoio do IC/FUC à Ciência e Cultura (FAPICC)ObjectiveTo test the hypothesis that the pulmonary vein pulsatility index (PVPI) is higher in fetuses with growth restriction (IUGR) than in normal fetuses. MethodsTwenty-two fetuses with IUGR and twenty-one (21) fetuses with appropriate growth for gestational age from healthy mothers were studied. PVPI was calculated by Doppler echocardiography [maximal velocity (systolic or diastolic peak)-pre-systolic peak/mean velocity]. Obstetric ultrasound was used to assess fetal biometry and Doppler to assess the uterine, umbilical and middle cerebral arteries PI. Statistical analysis used t test and Pearson's correlation. ResultsMean gestational age was 31.5+/-2.1weeks in the control group and 31.4+/-3.1weeks in IUGR (P=0.91). The PI of uterine and umbilical arteries were higher in IUGR than in controls (P<0.001). Mean PVPI in IUGR fetuses was 1.31+/-0.41, and in controls it was 0.83+/-0.11 (P<0.001). ConclusionThe pulsatility index of pulmonary venous flow in fetuses with growth restriction is higher than in normal fetuses, probably as a result of left atrial dynamics alteration secondary or not to fetal left ventricular diastolic dysfunction. (c) 2014 John Wiley & Sons, Ltd.[Bravo-Valenzuela, Nathalie J. M.; Zielinsky, Paulo; Nicoloso, Luiz H.; Piccoli, Antonio; Busato, Stefano] Inst Cardiol, Fetal Cardiol Unit, Porto Alegre, RS, Brazil[Huhta, James C.] Johns Hopkins Univ, All Childrens Hosp, St Petersburg, FL USA[Bravo-Valenzuela, Nathalie J. M.; Acacio, Gregorio L.] Universidade de Taubaté (Unitau), Sao Paulo, Brazi

    Exigências nutricionais da grápia ao fósforo e enxofre em Argissolo Vermelho distrófico arênico: efeito da adubação no crescimento Nutritional demand of grápia to phophorus and sulfur in paleaudalf soil: fertilization effects on growth

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    A grápia (Apuleia leiocarpa Vog. Macbride) é uma espécie de grande interesse madeireiro, encontrando-se, atualmente, bastante dizimada devido à exploração extrativista, sem haver reposição através de reflorestamento. O objetivo deste trabalho foi determinar os níveis ótimos de adubação de fósforo e enxofre no crescimento de plantas jovens de grápia. As plantas foram cultivadas em vasos contendo 3,5kg de solo Argissolo Vermelho distrófico arênico, sob condições de casa de vegetação não climatizada. O delineamento experimental foi o inteiramente casualizado com seis repetições. Foram avaliados 16 tratamentos em esquema bifatorial completo (4x4), representados pela combinação de quatro doses de P (0, 60, 120 e 180mg kg-1) e quatro de enxofre (0, 10, 20 e 30mg kg-1). A análise do crescimento das plantas foi realizada mensalmente através da altura da planta, diâmetro do caule e número de folhas remanescentes. Aos 130 dias após a emergência das plantas, avaliaram-se ainda o número de folhas caídas, matéria seca das folhas, caule, raízes e total da planta e a relação entre a matéria seca das raízes e da parte aérea. A produção de matéria seca total das plantas jovens de grápia respondeu positivamente à adubação conjunta de P e S, com dose de máxima eficiência técnica estimada de, respectivamente, 204 e 16mg kg-1 de solo. A adubação fosfatada na dose igual ou acima de 120mg kg-1 de solo induziu o aparecimento de clorose foliar típica da deficiência de Fe. A alta disponibilidade de P no solo favoreceu o crescimento da parte aérea em detrimento das raízes.<br>Grápia (Apuleia leiocarpa Vog. Macbride) is an important native forest species that has been in extinction process. The aim of this study was to determine the optimum levels of phosphorus and sulfur fertilization on the initial growth of grápia. Grápia plants were cultivated in pots containing 3.5kg of a Paleudalf soil, under unclimatized glasshouse conditions. Sixteen fertilization treatments were used in a complete bifactorial scheme (4x4), represented by the combination of four levels of P (0, 60, 120, and 180mg kg-1) and four levels of S (0, 10, 20, and 30mg kg-1). The plant growth in height, stem diameter, and number of leaves was analyzed monthly. After 130 days of cultivation other growth parameters were analyzed, as follow: number of fallen leaves, dry weight of roots, stem, leaves, and of the whole plant, and root/shoot dry weight ratio. The dry weight of the whole plant positively responded to the combination of phosphorus and sulfur fertilization, with the maximum technical efficiency level of 204 and 16mg kg-1 of soil, respectively. The phosphorus fertilization above 120mg kg-1 of soil gave rise a chlorosis in leaves similar to that of Fe deficiency. High availability of P in the soil was accounted for best growth of shoots in detriment of roots
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