Browsing by Author "Diaz, A."

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    Coastal brachyuran decapods
    (2006) Palma, Alvaro T.; Pardo, L. M.; Veas, R.; Cartes, C.; Silva, M.; Manriquez, K.; Diaz, A.; Munoz, C.; Ojeda, F. P.
    The importance of coastal morphology, and its influence on the magnitude of larval delivery and subsequent recruitment patterns of brachyuran decapods, was investigated at a broad range of spatial and temporal scales along the central coast of Chile. Larvae were quantified through plankton net towing as well as by using artificial settlement collectors deployed at different depths, while the abundance of benthic stages was quantified via in situ SCUBA airlifting and visual surveys. The abundance of young-of-the-year (YOY) and of individuals older than 1 yr (> 1 yr) was compared between sites with contrasting conditions of coastal exposure at peninsulas several hundred kilometers apart. Additionally, we pursued a temporally more detailed surveying program, which included more species, at the southernmost peninsula. From our results we conclude that: (1) in general, the abundance of Paraxanthus barbiger, the most abundant species throughout, was greater at all locations in 2003 compared with 2004 and it was also greater (particularly > 1 yr individuals) at protected sites; (2) for most of the species, the abundance of megalopae and YOY was highly seasonal, with peaks during the austral spring and summer months; and (3) for at least 2 of the 4 species considered in the southernmost peninsula, the abundance of YOY and > 1 yr individuals exhibited higher abundance at the protected site. In spite of our efforts, we failed to find significant correlation between local abundance of settlers on artificial collectors and YOY individuals that settled in nursery habitats directly below. Post-settlement mortality, operating very soon after settlement, is a likely explanation for this finding. Our study highlights the importance of considering factors such as coastal morphology together with the occurrence of post-settlement processes when studying coastal organisms with complex life cycles.
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    Comparison of complications and length of hospital stay between orthopedic and orthogeriatric treatment in elderly patients with a hip fracture
    (2012) Wagner, P.; Fuentes, P.; Diaz, A.; Martinez, F.; Amenábar Edwards, Pedro Pablo; Schweitzer, Daniel; Botello Correa, Eduardo; Gac Espínola, Homero
    Hip fractures in the elderly individuals are a complex problem. Our objective was to determine whether orthogeriatric treatment is effective in terms of reducing length of hospital stay, morbidity, and mortality of elderly patients with a hip fracture compared with orthopedic (traditional) treatment. From July 2009 to May 2011, patients older than 65 years with a hip fracture were followed prospectively. They were co-treated by geriatric and orthopedic teams. This cohort was compared with a retrospective cohort followed from January 2007 to June 2009 that was managed by the orthopedic surgery team only. Epidemiology, pre- and postoperative hematocrit, and renal function were registered. Also, in-hospital and distant mortality data (determined by consulting the national registry), mortality-associated factors, postoperative complications, hospital stay length, and transfers to other services were registered. One hundred and eighty-three patients in the retrospective group and 92 in the prospective group were included in this study with a median follow-up of 26 months (interquartile range: 13-41). The average age was 84 years and 74% of patients were female. Intertrochanteric fracture accounted for 51% of the cases. There was no difference between groups with regard to hospital stay length, hematocrit at discharge, in-hospital mortality, long-term survival, or transfers to internal medicine or the intensive care unit. It did show differences in the transfer to the intermediate care unit, prolonged hospitalizations (>20 days), and diagnosis of delirium and anemia requiring transfusion. In the present study, orthogeriatric treatment is slightly more effective than traditional treatment in terms of morbidity, but there is no difference in hospital stay length or mortality. Further studies and longer follow-up are needed to draw more conclusions.
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    Improvement in postoperative mortality in elective gastrectomy for gastric cancer: Analysis of predictive factors in 1066 patients from a single centre
    (2017) Norero Muñoz, Enrique; Vega, E.; Diaz, C.; Cavada, G.; Ceroni Villanelo, Marco; Martínez Belmar, Cristian Antonio; Briceño, Eduardo; Araos, F.; Gonzalez, P.; Báez Vallejos, Sergio Antonio; Viñuela Fawaz, Eduardo Andrés; Caracci, M.; Diaz, A.
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    Incidental versus non-incidental gallbladder cancer : index cholecystectomy before oncologic re-resection negatively impacts survival in T2b tumors
    (2019) Vega P., Eduardo; Viñuela Fawaz, Eduardo Andrés; Okuno, M.; Joechle, K.; Sanhueza García, Marcel Paolo; Diaz, C.; Jarufe Cassis, Nicolás; Martínez Castillo, Jorge; Troncoso, A.; Diaz, A.; Chun, Y.S.; Tzeng, C.W.D.; Lee, J.E.; Vauthey, J.N.; Conrad, C.
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    Risk factors for severe postoperative complications after gastrectomy for gastric and esophagogastric junction cancers
    (2019) Norero Muñoz, Enrique; Quezada, J.L.; Cerda, Jaime; Ceroni Villanelo, Marco; Martinez, C.; Mejia, R.; Munoz, R.; Araos, F.; Gonzalez, P.; Diaz, A.