40 research outputs found
Implantação Simultânea de MitraClip e Encerramento do Apêndice Auricular Esquerdo - «Beacuse It's There» Revisitado?
No full textinfo:eu-repo/semantics/publishedVersio
Combined MitraClip implantation and left atrial appendage occlusion - “because it's there” revisited
No full textA combined matrix-isolation infrared spectroscopy and MO study of 1-amino-2-propanol
No full textVibrational spectra of 1-amino-2-propanol (1AP) isolated in argon and krypton matrices at 14 K and of the pure liquid at room temperature were recorded and interpreted on the basis of ab initio MO calculations undertaken at the HF-SCF and MP2 levels of theory. For the first time, five different conformational states of monomeric 1AP could be experimentally observed and their vibrational signatures obtained. The observed conformers were found to correlate well with the most stable forms predicted by the MP2 calculations, the first and second lowest energy forms corresponding to conformers which exhibit a considerably strong intramolecular OH...N hydrogen bond (gG'g and g'Gg'), while the less abundant forms observed in the matrices (tG't, g'G't and tG'g') are characterized by having a relatively weak intramolecular NH...O bond. These results were reinforced by infrared solution studies of the compound in tetrachloroethylene. The experimental data obtained for the pure liquid, where OH...N intermolecular hydrogen bonding dominates, indicate that the preferred conformation of the monomeric unit within the aggregates is similar to conformer tG't.http://www.sciencedirect.com/science/article/B6THW-4378TW2-D/1/882ed76574dfb8ce4839bb30bb51178
Vibrational analysis and structural implications of H-bonding in isolated and aggregated 2-amino-1-propanol: a study by MI-IR and Raman spectroscopy and molecular orbital calculations
No full textIsolated 2-amino-1-propanol (2AP) was studied by matrix-isolation infrared spectroscopy (MI-IR) in Ar and Kr and ab initio 6-31G* calculations undertaken at the HF-SCF and MP2 levels of theory. For the first time, five different conformational states of 2AP could be experimentally observed, which could be correlated with the most stable forms predicted by the calculations. The first and second lowest energy forms correspond to conformers which exhibit a considerably strong intramolecular OH...N hydrogen bond (g'Gg' and gG'g), while the less abundant forms observed in the matrices (gGg', gGt and g'G'g) are characterized by having a weak intramolecular NH...O or OH...N bond. These results were reinforced by infrared solution studies of the compound in tetrachloromethane and tetrachloroethylene. The experimental data obtained for the pure liquid, where OH...N intermolecular hydrogen bonding dominates, indicate that the preferred conformation of the monomeric unit within the aggregates is similar to conformer gGt.http://www.sciencedirect.com/science/article/B6TGS-415RNK9-11/1/bc743f78fe244248cd0deab43f33534
Structural and vibrational characterisation of 3-amino-1-propanol a concerted SCF-MO ab initio, Raman and infrared (matrix isolation and liquid phase) spectroscopy study
No full textResults obtained for the isolated and liquid 3-amino-1-propanol by a concerted molecular orbital and vibrational spectroscopic approach are reported. The relative energies and both structural and vibrational data of the different conformers of the studied compound were calculated using the extended 6-31G* basis set both at the HF-SCF and MP2 ab initio levels of theory and the theoretical results used to interpret Raman and infrared experimental data. In the gaseous phase and for the molecule isolated in an Argon matrix, monomeric 3-amino-1-propanol exists as a mixture of conformers, the first and second lowest energy forms corresponding to conformers which exhibit an intramolecular OH---N hydrogen bond (forms I and II). On the other hand, in the pure liquid, where intermolecular H-bonding occurs, the monomeric unit within the aggregates assumes a conformation similar to that of the third most stable form found for the isolated molecule situation (form III), which is characterised by having a weak intramolecular NH---O bond. The experimental data obtained for the pure liquid also reveals the presence of monomeric form I in this phase, a result that is in consonance with the strongly stabilizing OH---N intramolecular hydrogen bond that is present in this conformer.http://www.sciencedirect.com/science/article/B6VNG-402TR9Y-3/1/4d2e96a2fd7da2d70b63b1e0a45769c
Heterotopic caval valve-in-valve procedure for prosthetic migration: two case reports
No full textBackground: Heterotopic bicaval stenting or caval valve implantation (CAVI) either with non-dedicated balloon-expandable Sapien™ valves (Edwards Lifesciences) or with dedicated TricValve™ (Products + Features) has emerged as a safe and effective percutaneous treatment for high-risk patients with severe tricuspid regurgitation (TR). One technical difficulty of CAVI is the lack of native calcified structures to anchor the device, which may lead to paravalvular leak or migration.
Cases summary: We describe two patients with severe TR and high surgical risk who underwent CAVI procedures, both of them complicated with device migration to the right atrium (one inferior vena cava device and one superior vena cava device). Both cases were treated with a caval valve-in-valve procedure, with good technical and clinical results.
Discussion: With the recent development of several percutaneous interventions for high-risk patients with severe TR, the rate of some possible complications is not well established, and neither are the better managing strategies. Device embolization is a rare complication of transcatheter heart interventions but with potential catastrophic consequences. Less invasive strategies such as the valve-in-valve procedure may be preferable in order to avoid the exposure of these patients to complex heart surgeries with extracorporeal circulation.info:eu-repo/semantics/publishedVersio
Thermal study of simple amino-alcohol solutions
No full textWidely regarded as the most promising approach to long-term cryopreservation of organs for transplantation, vitrification is a process where liquid is transformed into a disordered solid state free from crystals, known as the amorphous state. The vitreous state is obtained by rapid cooling to cryogenic temperatures in the presence of antifreeze substances called cryoprotectants, such as polyalcohols, which are known to be very good vitrification agents. This work reports on the thermal properties of a new class of compounds, the amino-alcohols, studied for its similarity to the structure of the equivalent polyalcohols. We studied by differential scanning calorimetry the glass-forming tendency and stability of the amorphous state for de-ionized water solutions containing 2-amino-1-ethanol and 3-amino-1-propanol at the concentrations of 35%, 40%, 43%, and 45% (w/w). A comparison is made with previous results obtained by Mehl [Cryobiology 27 (1990) 687–688] on the same compounds under different experimental conditions. The results are also compared with those obtained by Boutron [Cryobiology 30 (1993) 87–97] for the corresponding dialcohols. A further comparison is made with a few results obtained for the 1-amino-2-propanol and the 2-amino-1-propanol tested under the same condition
Caracterização morfológica de cultivares de pitaia, Selenicereus spp., no Algarve
No full textMestrado em Engenharia Agronómica / Instituto Superior de Agronomia. Universidade de LisboaA pitaia, Selenicereus spp. é uma planta originária das florestas tropicais da América
Central e do Sul, e é uma cultura relativamente nova em Portugal e na Europa. De grande
interesse, não só pelas suas propriedades benéficas para a saúde como também pelo seu valor
comercial crescente. É uma cultura que apresenta uma boa alternativa para a diversificação da
fruticultura da região do Algarve, onde se concentram a maioria das explorações de produção de
pitaia com objetivo comercial. As características do clima algarvio satisfazem grande parte das
necessidades climáticas da cultura. Existe uma grande diversidade de cultivares de pitaia, com
diferentes características e que dão origem a uma grande diversidade de frutos.
As suas características foram estudadas e detalhadas, devido à necessidade de
conhecer as cultivares presentes no Algarve. Os ensaios encontram-se em Cacela Velha, na
região do Algarve, e no viveiro Mil Plantas, em Estoi.
Para a caracterização morfológica das cultivares, foram recolhidos dados de cladódios,
flores e frutos nas plantas presentes em dois ambientes distintos. Para as cultivares presentes
em ambos os ambientes, foi possível fazer uma caracterização mais completa. Foi possível
perceber que estas expressam algumas das suas características de diferente forma,
dependendo do local de cultivo. A diferença considerada significativa, foi observada nas plantas
pertencentes a cultivar ‘Hybridum’, ´Tesoro´ e as plantas pertencentes à espécie S. purpusii. O
que mostra que existe uma variabilidade considerável em algumas plantas cultivadas na região
do Algarve.
As restantes cultivares são semelhantes em ambos os ambientes, apresentado as
maiores diferenças nas características quantitativas do cladódio e do fruto.Pitaya, Selenicereus spp. is a plant originally from tropical forest of Central and South
America, and a relatively new culture in Portugal and Europe. The culture has a keen interest not
only in its health principles but also in its growing commercial value. It is a crop that represents a
good alternative to diversify fruit production in the Algarve, where most of the commercial
exploration takes place. The climatic characteristics of the Algarve meet the main climatic needs
of the pitaia. A vast diversity of pitaya plants with different characteristics that produce a wide
variety of fruits.
These characteristics were studied in detail in this thesis, because there is a need for
better knowledge of the varieties cultivated in Algarve. The collections are located in Cacela
Velha, in the Algarve region and in the MilPlantas nursery, in Estoi.
For the morphological characterization of the cultivars, observations of cladodes, flowers
and fruits were recorded. The characterization of the cultivars common in both locations was more
complete. With these observations, it was possible to understand that the cultivar expresses its
characteristics differently depending on the place of cultivation. The plants belonging to
‘Hybridum’, ‘Tesoro’ cultivars and the plants of S. purpusii species were the plants that showed
greater differences in their characteristics. This suggests that there is some variability in some
plants grown in the Algarve region.
The remaining cultivars are similar in both locations. The greatest differences were
observed in the cladodes and fruits.N/
Caracterização morfológica de cultivares de pitaia, Selenicereus spp., no Algarve
No full textMestrado em Engenharia Agronómica / Instituto Superior de Agronomia. Universidade de LisboaA pitaia, Selenicereus spp. é uma planta originária das florestas tropicais da América
Central e do Sul, e é uma cultura relativamente nova em Portugal e na Europa. De grande
interesse, não só pelas suas propriedades benéficas para a saúde como também pelo seu valor
comercial crescente. É uma cultura que apresenta uma boa alternativa para a diversificação da
fruticultura da região do Algarve, onde se concentram a maioria das explorações de produção de
pitaia com objetivo comercial. As características do clima algarvio satisfazem grande parte das
necessidades climáticas da cultura. Existe uma grande diversidade de cultivares de pitaia, com
diferentes características e que dão origem a uma grande diversidade de frutos.
As suas características foram estudadas e detalhadas, devido à necessidade de
conhecer as cultivares presentes no Algarve. Os ensaios encontram-se em Cacela Velha, na
região do Algarve, e no viveiro Mil Plantas, em Estoi.
Para a caracterização morfológica das cultivares, foram recolhidos dados de cladódios,
flores e frutos nas plantas presentes em dois ambientes distintos. Para as cultivares presentes
em ambos os ambientes, foi possível fazer uma caracterização mais completa. Foi possível
perceber que estas expressam algumas das suas características de diferente forma,
dependendo do local de cultivo. A diferença considerada significativa, foi observada nas plantas
pertencentes a cultivar ‘Hybridum’, ´Tesoro´ e as plantas pertencentes à espécie S. purpusii. O
que mostra que existe uma variabilidade considerável em algumas plantas cultivadas na região
do Algarve.
As restantes cultivares são semelhantes em ambos os ambientes, apresentado as
maiores diferenças nas características quantitativas do cladódio e do fruto.Pitaya, Selenicereus spp. is a plant originally from tropical forest of Central and South
America, and a relatively new culture in Portugal and Europe. The culture has a keen interest not
only in its health principles but also in its growing commercial value. It is a crop that represents a
good alternative to diversify fruit production in the Algarve, where most of the commercial
exploration takes place. The climatic characteristics of the Algarve meet the main climatic needs
of the pitaia. A vast diversity of pitaya plants with different characteristics that produce a wide
variety of fruits.
These characteristics were studied in detail in this thesis, because there is a need for
better knowledge of the varieties cultivated in Algarve. The collections are located in Cacela
Velha, in the Algarve region and in the MilPlantas nursery, in Estoi.
For the morphological characterization of the cultivars, observations of cladodes, flowers
and fruits were recorded. The characterization of the cultivars common in both locations was more
complete. With these observations, it was possible to understand that the cultivar expresses its
characteristics differently depending on the place of cultivation. The plants belonging to
‘Hybridum’, ‘Tesoro’ cultivars and the plants of S. purpusii species were the plants that showed
greater differences in their characteristics. This suggests that there is some variability in some
plants grown in the Algarve region.
The remaining cultivars are similar in both locations. The greatest differences were
observed in the cladodes and fruits.N/
Not all pseudoaneurysms are femoral—A transcaval transcatheter aortic valve replacement rare complication
No full textWe report a case of a 73-year-old male with multiple comorbidities, including postpoliomyelitis severe scoliosis, referred to our tertiary center due to a severe symptomatic aortic stenosis, considered high risk for surgical aortic valve replacement (AVR). Due to unsuitable femoral and subclavian accesses, the patient underwent a transcaval transcatheter AVR (TAVR) procedure, complicated by the development of an iatrogenic infrarenal aortic pseudoaneurysm with aortocaval fistula. Scoliosis can cause varying anatomic relationships between retroperitoneal vessels and intervertebral disk spaces, which increase the difficulty of the procedure and consequently lead to this vascular complication. Although most aortocaval fistulas close spontaneously after 1 year, the risk of pseudoaneurysm rupture in this critical area was crucial in the decision of a new successful percutaneous aortic stent intervention.info:eu-repo/semantics/publishedVersio
