Risco de tromboembolismo venoso e tromboprofilaxia nos hospitais portugueses – Estudo ARTE

INTRODUCTION: Venous thromboembolism (VTE) is a relatively common complication during hospital stay and determination of VTE risk is critical to choosing the best prophylactic strategy for each patient. OBJECTIVES: In the present study we studied the risk profile for VTE in hospitalized patients in a group of hospitals in Portugal. METHODS: Based on an open cohort of 4248 patients hospitalized in surgical, internal medicine, orthopedic or oncology departments, we determined thromboembolic risk at admission by applying a new score, modified from the Caprini and Khorana scores. Thrombotic, embolic and bleeding events and death were assessed during hospital stay and at three and six months after discharge. RESULTS: The median duration of hospital stay was five days and thromboembolic prophylaxis was implemented in 67.2% (n=2747) of the patients. A low molecular weight heparin was used as prophylaxis in the majority of cases (88.3%). Most patients were classified as high (68%) or intermediate risk (27%). The overall incidence of thromboembolic events was 1.5%. Major bleeding events were recorded in 3.89% of patients and all-cause mortality was 3.4%. CONCLUSIONS: In this study, we propose a modified VTE risk score that effectively risk-stratifies a mixed inpatient population during hospital stay. The use of this score may result in improvement of thromboprophylaxis practices in hospitals.info:eu-repo/semantics/publishedVersio

Equilibrium and Disorder-induced behavior in Quantum Light-Matter Systems

We analyze equilibrium properties of coupled-doped cavities described by the Jaynes-Cummings- Hubbard Hamiltonian. In particular, we characterize the entanglement of the system in relation to the insulating-superfluid phase transition. We point out the existence of a crossover inside the superfluid phase of the system when the excitations change from polaritonic to purely photonic. Using an ensemble statistical approach for small systems and stochastic-mean-field theory for large systems we analyze static disorder of the characteristic parameters of the system and explore the ground state induced statistics. We report on a variety of glassy phases deriving from the hybrid statistics of the system. On-site strong disorder induces insulating behavior through two different mechanisms. For disorder in the light-matter detuning, low energy cavities dominate the statistics allowing the excitations to localize and bunch in such cavities. In the case of disorder in the light- matter coupling, sites with strong coupling between light and matter become very significant, which enhances the Mott-like insulating behavior. Inter-site (hopping) disorder induces fluidity and the dominant sites are strongly coupled to each other.Comment: about 10 pages, 12 figure

MACOC: a medoid-based ACO clustering algorithm

The application of ACO-based algorithms in data mining is growing over the last few years and several supervised and unsupervised learning algorithms have been developed using this bio-inspired approach. Most recent works concerning unsupervised learning have been focused on clustering, showing great potential of ACO-based techniques. This work presents an ACO-based clustering algorithm inspired by the ACO Clustering (ACOC) algorithm. The proposed approach restructures ACOC from a centroid-based technique to a medoid-based technique, where the properties of the search space are not necessarily known. Instead, it only relies on the information about the distances amongst data. The new algorithm, called MACOC, has been compared against well-known algorithms (K-means and Partition Around Medoids) and with ACOC. The experiments measure the accuracy of the algorithm for both synthetic datasets and real-world datasets extracted from the UCI Machine Learning Repository

Geometrically induced singular behavior of entanglement

We show that the geometry of the set of quantum states plays a crucial role in the behavior of entanglement in different physical systems. More specifically it is shown that singular points at the border of the set of unentangled states appear as singularities in the dynamics of entanglement of smoothly varying quantum states. We illustrate this result by implementing a photonic parametric down conversion experiment. Moreover, this effect is connected to recently discovered singularities in condensed matter models.Comment: v2: 4 pags, 4 figs. A discussion before the proof of Proposition 1 and tomographic results were included, Propostion 2 was removed and the references were fixe

Influência da palhada de gramíneas forrageiras sobre o desenvolvimento da planta de milho e das plantas daninhas.

Avaliou-se o efeito da palhada de gramíneas forrageiras (capim braquiarão, milheto e sorgo forrageiro) sobre o desenvolvimento da planta de milho e das plantas daninhas, em experimento realizado na Embrapa Milho e Sorgo, no período de março de 2006 a fevereiro de 2007. Os tratamentos foram constituídos pelas três plantas de cobertura, sofrendo ou não um corte após 60 dias de implantação das parcelas, mais um tratamento sem cobertura (pousio). A cobertura de capim braquiária interferiu negativamente no stand inicial, altura de plantas e de espigas. O diâmetro de colmo das plantas de milho na cobertura de milheto foi inferior. Não houve diferença significativa entre as coberturas e nem destas com relação ao pousio, para os demais parâmetros. Também não houve efeito significativo do corte sobre nenhuma das características agronômicas analisadas e nem para os dados de produção do milho. Nas três espécies de cobertura, os percentuais de redução na infestação de plantas daninhas em relação à testemunha sem palha (pousio) foram altos O efeito do corte não foi significativo na supressão de plantas daninhas. O capim braquiária foi superior no percentual de redução da infestação de plantas daninhas e na produção de palha, indicando provável correlação entre as duas variáveis