Browsing by Author "Sequeira, A"
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- Bicuspid Aortic Valve Aortopathies: an Hemodynamics Characterization in Dilated AortasPublication . Oliveira, D; Aguiar Rosa, S; Tiago, J; Cruz Ferreira, R; Agapito, A; Sequeira, ABicuspid aortic valve (BAV) aortopathy remains of difficult clinical management due to its heterogeneity and further assessment of related aortic hemodynamics is necessary. The aim of this study was to assess systolic hemodynamic indexes and wall stresses in patients with diverse BAV phenotypes and dilated ascending aortas. The aortic geometry was reconstructed from patient-specific images while the aortic valve was generated based on patient-specific measurements. Physiologic material properties and boundary conditions were applied and fully coupled fluid-structure interaction (FSI) analysis were conducted. Our dilated aortic models were characterized by the presence of abnormal hemodynamics with elevated degrees of flow skewness and eccentricity, regardless of BAV morphotype. Retrograde flow was also present. Both features, predicted by flow angle and flow reversal ratios, were consistently higher than those reported for non-dilated aortas. Right-handed helical flow was present, as well as elevated wall shear stress (WSS) on the outer ascending aortic wall. Our results suggest that the abnormal flow associated with BAV may play a role in aortic enlargement and progress it further on already dilated aortas.
- Os Médicos na Vida e na Obra de Eça de QueirozPublication . Sequeira, AO autor, depois de fazer uma rápida revisão dos conhecimentos alcançados pela Medicina até 1900, ano em que Eça de Queiroz morreu em Paris, analisa as doenças que afligiram o escritor ao longo da sua vida, com especial destaque para aquela que o vitimou, e refere-se aos vários médicos que o trataram. Numa segunda parte, faz a revisão dos personagens-médicos presentes nos livros que escreveu, alguns dos quais desempenham um papel fundamental na estrutura da sua obra literária.