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ABSTRACT The objective of this study was to evaluate the effect of either a limited forage intake or concentrate supplementation prior to the adaptation to high-concentrate diets on dry matter intake, ruminal pH, bacteria, and protozoa of Nellore cattle. The experiment was designed as a two 3×3 Latin square, and six cannulated Nellore steers were used. Each experimental period was composed by three feeding phases: pre-adaptation (14 days), adaptation (12 days), and finishing (seven days) diet, in a total of 33 days per period. The steers were assigned to one of three pre-adaptation dietary treatments: control (Tifton hay fed ad libitum + mineral supplement), restriction (Tifton hay fed at 1.4% of BW + mineral supplement), and concentrate (Tifton hay fed ad libitum + 0.5% of BW of a mix of concentrate feedstuffs and mineral supplement). The adaptation period consisted of two adaptation diets, which contained 72 and 79% concentrate for six days each. The finishing diet contained 86% concentrate. During the pre-adaptation phase, restricted cattle had higher pH than concentrate-fed cattle. There was a reduction in M. elsdenii relative population in cattle from either restriction or concentrate groups. During adaptation and finishing phases, cattle from concentrate group had smaller F. succinogenes populations compared with the control group. The previous nutritional backgrounds impact ruminal microbiota during adaptation and finishing phases without causing any negative effect on ruminal pH. Feeding concentrate prior to the adaptation positively impacted the transition to high-concentrate diets and promoted increased dry matter intake.

https://doi.org/10.37496/rbz5220210229

Herpetofauna of protected areas in the Caatinga VIII: An updated checklist for the Serra das Confusões region with new data from Serra Vermelha, Piauí, Brazil
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Marques, Ricardo

; Garda, Adrian A.

; Furtado, Adriana P.

; Bruinjé, Andre C.

; Protázio, Arielson dos S.

; de Carvalho, Breno F.

; Vieira, Cecília R.

; Gomes, Dandara

; Pantoja, Davi L.

; Figueiredo, Diainara da S.

; Shepard, Donald B.

; Camurugi, Felipe

; Coelho, Felipe E. A.

; Magalhães, Felipe M.

; Caetano, Gabriel H. O.

; Colli, Guarino R.

; Paulino, Henrique M.

; Carvalho, Izabelle T. S.

; Graciene, Joedma

; Alvarenga, Júlio M.

; Clay, Natalie A.

; Albuquerque, Ralph L.

; Bosque, Renan J.

; Faria, Renato

; da Silveira-Filho, Ricardo R.

; Mângia, Sarah

; Cavalcante, Vitor H. G. L.

; Vieira, Washington L. S.

; da Silva, Willianilson P.

; Soares, Yan F. F.

; Mesquita, Daniel O.

Biota Neotropica

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2023, Volume 23 N. 4 elocation e20231520

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

Abstract It is repeatedly stressed the need to characterize the extant biodiversity in tropical ecosystems. However, inventory studies are still progressing slowly in dry ecosystems, leading to the underestimation of their true biodiversity and hindering conservation efforts. In this study, we present primary and secondary data, along with an updated list of amphibians and reptiles from two localities in the São Francisco-Gurguéia region in Piauí. Additionally, we compare the species composition between nine areas within the Caatinga, which were sampled using standardized methods over the past ten years, to examine broader spatial patterns of community composition. To survey reptiles and amphibians, we employed similar methods and sampling efforts in two areas within the Serra das Confusões National Park (SCNP) region. Our surveys recorded a total of 73 species of amphibians and reptiles, of which 24 are new distribution records for the SCNP region. Consequently, our findings increase the known herpetofauna in the region to 94 species. Despite their proximity, the two sites in the SCNP region exhibited only 42% similarity in species composition, and they differed significantly from other areas within the Caatinga. Furthermore, even the closer Caatinga areas presented differences in species composition, highlighting the necessity to evaluate biodiversity across the landscape and contribute to understanding biogeographic patterns.

Resumo É repetidamente enfatizada a necessidade de caracterizar a biodiversidade vivente em ecossistemas tropicais. No entanto, os estudos de inventário ainda estão progredindo lentamente em ecossistemas secos, levando à subestimação de sua verdadeira biodiversidade e dificultando os esforços de conservação. Neste estudo, apresentamos dados primários e secundários, juntamente com uma lista atualizada de anfíbios e répteis de duas localidades na região de São Francisco-Gurguéia, do Piauí. Além disso, comparamos a composição de espécies entre nove áreas dentro da Caatinga, que foram amostradas usando métodos padronizados nos últimos dez anos, para examinar padrões espaciais mais amplos de composição da comunidade. Para estudar répteis e anfíbios, utilizamos métodos e esforços de amostragem semelhantes em duas áreas na região do Parque Nacional da Serra das Confusões (PNSC). Nossos levantamentos registraram um total de 73 espécies de anfíbios e répteis, das quais 24 são novos registros de distribuição para a região do PNSC. Consequentemente, nossos resultados aumentam a herpetofauna conhecida na região para 94 espécies. Apesar da proximidade, os dois locais na região do PNSC exibiram apenas 42% de similaridade na composição de espécies e diferiram significativamente de outras áreas dentro da Caatinga. Mesmo áreas mais próximas da Caatinga apresentaram diferenças na composição de espécies, destacando a necessidade de avaliar a biodiversidade em toda a paisagem e contribuir para a compreensão de padrões biogeográficos.

https://doi.org/10.1590/1676-0611-bn-2023-1520

Metabolomic and Histological Response of Passiflora cincinnata Infected with Cowpea aphid-borne mosaic virus (CABMV) Reveals Changes in Asymptomatic and Symptomatic Phases
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Mesquita, Paulo R. R.

; Barbosa, Naira C. S.

; Santos, Fábio N. dos

; Rodrigues, Frederico M.

; Abreu, Emanuel F. M.

; Leite, Kelly R. B.

; Jesus, Onildo N.

; Tumelero, Andréia I.

; Schnadelbach, Alessandra S.

; Barbosa, Cristiane J.

Journal of the Brazilian Chemical Society

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dec 2022, Volume 33 N. 12 Pages 1456 - 1468

Abstract: En | Text: En | PDF: En

Passion fruit woodiness disease, caused by the Cowpea aphid-borne mosaic virus (CABMV), is one of the leading phytosanitary challenges of passion fruit production. Passiflora cincinnata has been recognized for its potential in genetic improvement due to its highest resistance to CABMV and other phytopathogens. Metabolomic and histological alterations of P. cincinnata infected with CABMV were evaluated and searched for differential responses during the asymptomatic or symptomatic infection phases to correlate them with the mechanisms of metabolic defense. The metabolites of infected plants were analyzed by liquid chromatography-mass spectrometry. Based on the metabolomic profile, the times of infection were grouped into early or late infection phases. The metabolites related to CABMV infection were classified as alkaloids, saponins, phospholipids and acids. This study can assist agricultural institutions or farms in the early diagnosis and correct management of CABMV infection and contribute to the genetic improvement of the Passiflora genus against this disease.

https://doi.org/10.21577/0103-5053.20220080

Estudo da degradação do pesticida fipronil utilizando heteroestruturas de semicondutores de BiVO4/CePO4 e CePO4/BiVO4
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Eduardo, A. C.

; Rodrigues, M. H. M.

; Mesquita, W. D.

; Gonçalves, R. F.

; Gurgel, M. F. C.

; Godinho, M. J.

Cerâmica

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dec 2021, Volume 67 N. 384 Pages 455 - 462

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo O uso de pesticidas, como o fipronil, visa o aumento da produtividade, melhoria na qualidade dos produtos gerados e a diminuição de prejuízos. Contudo, os resíduos acumulados podem ser lavados durante as chuvas, ocasionando a contaminação de águas superficiais e subterrâneas. Nesse aspecto, a combinação entre semicondutores na forma de heteroestruturas é uma alternativa para degradação de tais poluentes. Heteroestruturas BiVO4/CePO4 e CePO4/BiVO4 foram sintetizadas pelo método de coprecipitação seguido de tratamento hidrotérmico assistido por micro-ondas, a 130 °C por 30 min. Os estudos de difração de raios X demonstraram a formação das heteroestruturas com estruturas de fase hexagonal (CePO4) e tetragonais scheelita e zircônia (BiVO4). Os resultados obtidos por microscopia eletrônica de transmissão e espectroscopia de infravermelho sugeriram a formação de uma região de interface, a qual contribuiu na sinergia entre os catalisadores. As heteroestruturas BiVO4/CePO4 e CePO4/BiVO4 apresentaram degradação de 80,06% e 99,50%, respectivamente, frente ao pesticida fipronil.

Abstract The use of pesticides, such as fipronil, aims to increase productivity, improve the quality of agricultural products generated, and reduce losses. However, pollutants accumulated can be loaded during rains, causing contamination in the surface and groundwater. Therefore, the combination of different semiconductors to form heterostructures can potentiate the degradation of such pollutants. BiVO4/CePO4 and CePO4/BiVO4 heterostructures were synthesized by co-precipitation method plus microwave-assisted hydrothermal treatment at 130 °C for 30 min. X-ray diffraction studies demonstrated the formation of heterostructures containing hexagonal phase (CePO4) and scheelite and zircon-type tetragonal phases (BiVO4). The obtained results by transmission electron microscopy and Fourier transform infrared spectroscopy results suggested the formation of an interface that contributed to the synergy between catalysts. BiVO4/CePO4 and CePO4/BiVO4 heterostructures showed degradation of 80.06% and 99.50%, respectively, of pesticide fipronil.

https://doi.org/10.1590/0366-69132021673843082 1 downloads

SYNTHESIS, LARVICIDAL AND ACETYLCHOLINESTERASE INHIBITORY ACTIVITIES OF CARVACROL/THYMOL AND DERIVATIVES
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Mesquita, Bruna M. de

; Nascimento, Patricia G. G. do

; Souza, Luciana G. S.

; Farias, Iolanda F. de

; Silva, Romézio A. C. da

; Lemos, Telma L. G. de

; Monte, Francisco J. Q.

; Oliveira, Irvila R.

; Trevisan, Maria T. S.

; Silva, Horlando C. da

; Santiago, Gilvandete M. P.

Química Nova

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apr 2018, Volume 41 N. 4 Pages 412 - 416

Abstract: En | Text: En | PDF: En

In order to produce bioactive derivatives of carvacrol and thymol, nine derivatives of each compound were prepared through modifications the phenolic hydroxyl group. The structures of compounds were confirmed by spectral data from MS, IR and NMR. Carvacrol, thymol and derivatives were submitted to the evaluation of the inhibition of the enzyme acetylcholinesterase, using a colorimetric method in which the inhibition of the enzyme is measured by coloration, and larvicidal activity against Aedes aegypti. Derivatives carvacryl acetate-1b and thymyl hexanoate-2b showed the best results for the inhibition of the acetylcholinesterase enzyme, and for the larvicidal activity the derivatives 1a, 1b, 1c, 3h, 2a, 2b, 2c and 4h showed positive results, emphasizing compound thymyl 4-methoxybenzoate-4h which showed LC50 values of 23.60 ppm, considered a very good result.

https://doi.org/10.21577/0100-4042.20170189 946 downloads

COMPUTATIONAL FLUID DYNAMICS (CFD) APPLICATION FOR VENTILATION STUDIES IN BROILER HOUSES
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Curi, Thayla M. R. de C.

; Moura, Daniella J. de

; Massari, Juliana M.

; Mesquita, Márcio

; Pereira, Danilo F.

Engenharia Agrícola

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feb 2017, Volume 37 N. 1 Pages 1 - 12

Abstract: En | Text: En | PDF: En

ABSTRACT With the recent increase in the number of acclimatized broiler houses in Brazil, design and adaptation of facilities to withstand the tropical weather conditions enabling the maintenance of ideal conditions without increasing costs have been major challenges. The aim of this study was to evaluate the ventilation system in solid-wall broiler houses using computational fluid dynamics (CFD). The research was carried out in the city of Amparo - SP (Brazil). The facility consisted of a broiler house enclosed by masonry sidewalls with tunnel ventilation equipped with exhaust fans (air outlet) and cooling pads (air inlet). The following variables were collected: wind speed and dry bulb temperature over 27 equidistant points inside the house at bird height (0.30 m above the floor), wind speed in inlet – cooling pad, and static pressure in the outlet (exhaust fans) as a boundary condition. The data were monitored at the most critical time of the day – 2 pm during the final rearing stage in summer. The CFD technique allowed visualizing the air flow according to each running condition for exhaust fans, as well as determined the best setting of exhaust fans, avoiding a low air area renewal and turbulence.

https://doi.org/10.1590/1809-4430-eng.agric.v37n1p1-12/2017 2931 downloads

Crescimento e produção da mamoneira BRS Paraguaçu sob irrigação, cobertura do solo e adubação orgânica
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Ferreira, Nubia M.

; Mesquita, Evandro F. de

; Sá, Francisco V. da S.

; Bertino, Antonio M. P.

; Paiva, Emanoela P. de

; Farias, Soahd A. R.

Revista Brasileira de Engenharia Agrícola e Ambiental

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sep 2015, Volume 19 N. 9 Pages 857 - 864

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMOObjetivou-se, neste trabalho, avaliar o crescimento e produção da mamona cv. BRS-188 Paraguaçu que tem sido recomendada para a região Nordeste do Brasil em relação à adubação orgânica, cobertura morta e níveis de reposição de água. Para isto foi desenvolvido o experimento em condições de campo, na cidade de Catolé do Rocha, PB, usando-se um delineamento experimental em blocos casualizados com fatorial 2 x 2 x 4, constituído de dois níveis de reposição de água em função da evapotranspiração da cultura - ETc de 100 e 50% no solo sem e com cobertura morta (Cenchrus ciliares L) e quatro níveis de biofertilizante bovino (0; 1,2; 2,4 e 3,6 L planta-1), aplicados ao solo totalizando 16 tratamentos com três repetições e dez plantas por tratamento totalizando 48 parcelas experimentais. As plantas irrigadas com 50% da ETc, no solo com cobertura morta e biofertilizante bovino na dose de 3,6 L planta-1atingiram áreas foliares e produções semelhantes às plantas cultivadas em sistema convencional sem cobertura e irrigadas com 100% da ETc.

ABSTRACTThe objective of this study was to evaluate the growth and production of castor bean BRS-188 Paraguaçu, which has been recommended for the Northeast of Brazil in relation to organic fertilization, mulching and levels of water replacement. For this, an experiment was conducted under field conditions in the municipality of Catolé of Rocha-PB, using a randomized complete block design with factorial 2 x 2 x 4, consisting of two levels of replacement of water through irrigation due to the crop evapotranspiration - ETc 100 and 50%, with and without mulch (Cenchrus ciliares L) and four levels of bovine biofertilizer (0, 1.2, 2.4 and 3.6 L plant-1), applied to the soil, totaling 16 treatments with three replications and ten plants per treatment totaling 48 experimental plots. Plants irrigated with 50% of ETc, under mulch and bovine fertilizer at a dose of 3.6 L plant-1 reached leaf area and similar productions to plants grown in conventional system without mulch cover and irrigated with 100% ETc.

https://doi.org/10.1590/1807-1929/agriambi.v19n9p857-864 6189 downloads

Experimental density data and excess molar volumes of coconut biodiesel + n-hexadecane and coconut biodiesel + diesel at different temperatures
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Mesquita, F. M. R.

; Feitosa, F. X.

; Santiago-Aguiar, R. S. de

; Sant'Ana, H. B. de

Brazilian Journal of Chemical Engineering

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jun 2014, Volume 31 N. 2 Pages 543 - 551

Abstract: En | Text: En | PDF: En

The density of the pure component (n-hexadecane), pure pseudo-components (coconut biodiesel and diesel) and pseudo-binary mixtures of coconut biodiesel with n-hexadecane (or + diesel) were measured at temperatures 293.15, 313.15, 333.15, 353.15 and 373.15 K and atmospheric pressure, over the entire composition range (mole fractions from 0.1 to 0.9, with a step de 0.1). Densities were determined using an Anton Paar SVM 3000 viscodensimeter. Experimental density values decreased with the increase of the temperature. The excess molar volumes of the pseudo-binary mixtures were calculated by using the experimental values of density. Excess molar volumes were correlated with the Redlich-Kister polynomial expansions. Excess molar volumes show positive and negative values in the two systems studied. Excess partial volumes at infinite dilution were calculated for coconut biodiesel, n-hexadecane and diesel in the mixtures studied.

https://doi.org/10.1590/0104-6632.20140312s00002600 6260 downloads

Viscosities and viscosity deviations of binary mixtures of biodiesel + petrodiesel (or n-hexadecane) at different temperatures
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Mesquita, F. M. R.

; Feitosa, F. X.

; Carmo, F. R. do

; Santiago-Aguiar, R. S. de

; Sant'Ana, H. B. de

Brazilian Journal of Chemical Engineering

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sep 2012, Volume 29 N. 3 Pages 653 - 664

Abstract: En | Text: En | PDF: En

Viscosities of four binaries mixtures [soybean biodiesel + diesel oil (or n-hexadecane) and coconut biodiesel + diesel oil (or n-hexadecane)] have been determined at T = (293.15, 313.15, 333.15, 353.15, 373.15) K and atmospheric pressure over the entire composition range. Experimental data were fitted to the Andrade equation and the adjustable parameters and the standard deviations between experimental and calculated values were estimated. From the experimental data, the viscosity deviations, <img src="/img/revistas/bjce/v29n3/21e02.jpg" alt="" align="absmiddle" />, were calculated by using the Redlich - Kister polynomial equation. The comparison between experimental data determined in this work and four predictive methods used for the estimation of viscosities of biodiesel fuels (based on their fatty acid composition) is discussed.

7586 downloads Cited 2 times in SciELO

10.

Constituintes químicos das folhas de Murraya paniculata (Rutaceae)
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Mesquita, Sumaia G.

; Martinez, Marcela F.

; Romoff, Paulete

; Fávero, Oriana A.

; Lieber, Sofia R.

; Lago, João Henrique G.

Revista Brasileira de Farmacognosia

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dec 2008, Volume 18 N. 4 Pages 563 - 568

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

A separação cromatográfica do extrato hexânico e da fase em CH2Cl2 do extrato etanólico das folhas de Murraya paniculata resultou no isolamento de um triterpeno (24-metileno-cicloartan-3β-ol), um fenilpropanóide (cafeato de metila) e sete cumarinas preniladas [isomeranzina, acetato de murranganona, murrayatina, murrangatina, hidrato de meranzina, febalosina e murranganona]. Dentre as substâncias isoladas, as cumarinas foram detectadas anteriormente em M. paniculata ao passo que 24-metileno-cicloartan-3β-ol e cafeato de metila estão sendo descritos pela primeira vez no gênero Murraya. Os extratos e frações além das substâncias puras foram submetidos à avaliação do potencial antimicrobiano frente à Staphylococcus aureus e Escherichia coli indicando que somente a cumarina hidrato de meranzina mostrou fraca atividade.

Chromatographic separation of the hexane extract and the CH2Cl2 phase from the ethanol extract from leaves of Murraya paniculata yielded one triterpenoid (24-methylene-cycloartan-3β-ol), one phenylpropanoid (methyl caffeate) and seven coumarins [isomeranzine, murranganone acetate, murrayatine, murrangatine, meranzine hydrate, phebalosine and murranganone]. All the isolated coumarins were previously obtained from M. paniculata while 24-methylene-cycloartan-3β-ol and methyl caffeate have been described for first time in the Murraya genus. The crude extracts, fractions and pure substances were submitted to evaluation of antimicrobial potential against Staphylococcus aureus and Escherichia coli which indicated that the coumarin meranzine hydrate showed weak activity.

4115 downloads

11.

Specialized metabolism and biochemical suppression during aestivation of the extant South American lungfish --<FONT FACE=Symbol></FONT>Lepidosiren paradoxa
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MESQUITA-SAAD, L. S. B.

; LEITÃO, M. A. B.

; PAULA-SILVA, M. N.

; CHIPPARI-GOMES, A. R.

; ALMEIDA-VAL, V. M. F.

Brazilian Journal of Biology

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aug 2002, Volume 62 N. 3 Pages 495 - 501

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Lepidosiren paradoxa (pirambóia) é o único representante dos Dipnoan (peixes pulmonados) na América do Sul. Essa espécie é considerada um "fóssil vivo", apesar de alguns estudos terem revelado um estilo de vida muito especializado. A espécie pode ser encontrada estivando durante a seca e desenvolvendo adaptações metabólicas para enfrentar as trocas que ocorrem periodicamente em seu ambiente: inundações e secas. As descrições encontradas na literatura sobre as ultra-estruturas dos tecidos revelam alta concentração de glicogênio (substância de estocagem) no músculo, sugerindo forte tendência para a glicólise anaeróbica. O presente estudo descreve os níveis enzimáticos de LDH, MDH e CS nos tecidos do coração e músculo bem como a distribuição enzimática das isozimas LDH, MDH, ADH, PGI, SOD e PGM em 7 espécimes coletadas no Lago do Canteiro, Rio Amazonas, ocasião em que se encontravam estivando. Os animais foram capturados pelos pescadores (armadilha individual) durante o período em que estavam enterrados na lama do lago durante a "seca". Nossos resultados revelaram alta capacidade anaeróbica dos músculos esquelético e cardíaco no período, quando as enzimas mostram níveis bastante inferiores (indicando supressão metabólica) em relação aos animais ativos (dados obtidos na literatura). Os padrões isozímicos sugerem a perda da condição de loci duplicados na maioria dos sistemas isozímicos, característica que ocorre principalmente em vertebrados pertencentes a categorias superiores. Esses dados indicam que, comparado ao grupo dos peixes, o peixe pulmonado pode ser considerado especializado (ou avançado), apesar da manutenção de duas características morfológicas primitivas.

Lepidosiren paradoxa (pirambóia) is the single representative of Dipnoan (lungfish) in South America. This species is considered a living fossil, in spite of some reports describing this fish as having a very specialized life style. It aestivates during the dry season, and has developed metabolic adaptations to cope with both flooding and drought. The literature describing its tissue ultra-structure shows high glycogen stored in the muscle, suggesting a strong dependence on anaerobic glycolysis. The present paper reports tissue enzyme levels of LDH, MDH, and CS, and isozymic tissue distribution of LDH, MDH, ADH, PGI, SOD, and PGM of 7 aestivating specimens from Lago do Canteiro in the Amazonas River. Animals were caught while burrowed in mud during the aestivation period. Our findings reveal high anaerobic capacity of both skeletal and heart muscles, even during the aestivation period, when enzymes showed suppressed levels compared to those of non-aestivating animals (data from the literature). Isozymic patterns suggest loss of duplicate condition in most analyzed loci, a characteristic that occurs mainly in higher vertebrate categories. These data indicate that, compared to the fish group, lungfish may be considered advanced, despite retaining primitive morphological characters.

3198 downloads

12.

Anastomose cavo-pulmonar total sem uso de material protético
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PINTO Jr., Valdester C.

; CARVALHO Jr., Waldemiro

; BARROSO, Haroldo B.

; MEJIA, Juan Alberto C.

; MESQUITA, Fernando Antonio de

; SARDENBERG, Claudia R. C.

; CIRINO, Célia M. F.

; ROCHA, Marilena G.

; SARDENBERG, Ricardo F.

; RODRIGUES, Edna S.

; ARAÚJO, José Augusto R.

; MAGALHÃES, Antonio Olavo S.

; TORRES, João Martins de S.

Brazilian Journal of Cardiovascular Surgery

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jul 1998, Volume 13 N. 3

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Objetivo: Demonstrar a viabilidade na feitura de túnel cava inferior-cava superior com retalho da parede atrial direita, evitando o emprego de material protético. Casuística e Métodos: Foram operados 2 pacientes nos quais se empregou a técnica de anastomose cavo-pulmonar total, sem uso de material protético. O primeiro caso, A.L.M., masc, 4 anos, 15 kg, era portador de atresia tricúspide (EP), com comunicação interventricular (CIV) restritiva. O segundo caso, M.E.N.O., fem, 15 anos, 47 kg, tinha doença de Ebstein. O controle pós-operatório dos pacientes foi feito com ecocardiograma e cateterismo cardíaco. As operações foram realizadas com o emprego de circulação extracorpórea (CEC), e cardioplegia sangüínea como método de proteção miocárdica. A canulação das cavas foi o mais distal possível. A tunelização foi realizada com retalho de tecido atrial direito, suturado ao septo interatrial, deixando-se o seio coronariano e a comunicação interatrial (CIA) para a esquerda. Resultados: Ambos os pacientes evoluíram, sem complicações, na UTI. O primeiro apresentou derrame pleural discreto à direita, e o segundo mantém-se em estimulação artificial (VVI,R). Conclusões: A tunelização intra-atrial para anastomose cavo-pulmonar total pode ser realizada sem o uso de material protético, evitando-se os riscos advindos do seu emprego (calcificação, retração, embolização).

The authors describe two cases (one tricuspid atresia without TGA or pulmonary stenosis, but with a restrictive IVC: the second of an Ebstein disease) of total cavo-pulmonary anastomosis using only the tissue of the atrial wall, avoiding any prosthetic material. Both cases were done under cardiopulmonary bypass and cold blood cardioplegia. A flap of the right atrial wall was used to re-direct the blood flow. Pleural effusion in one patient and complete AV block in the other were the complications found. They conclude that right intra-atrial tunneling for total cavo-pulmonary anastomosis, avoiding the use of any foreign material is feasible, thus diminishing the possible late risks (calcification, embolization, retraction) of prosthetic materials.

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