Browsing by Author "Troncoso, Andrés"

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    12,000 years away from the sea: Long-term circulation of Pacific shells in the Semiarid North of Chile (South America)
    (2025) Hernández Castillo, Daniel; Troncoso, Andrés; Méndez, César; Pascual Grau, Daniel; Armstrong, Felipe; Nuevo-Delaunay, Amalia; Grasset, Sebastián; Pérez, Isidora; Vera, Francisca; Delgado, Manuela; Escudero, Antonia; Pino, Mariela; Larach, Pablo
    Marine resources provide a baseline for understanding the sociohistorical trajectories of Andean societies using Pacific coastal environments. This study examines seashell distributions in northern Chile's semiarid region, revealing inland circulation patterns established over twelve thousand years. This included an extensive review of published information and new data assessed through GIS and least-cost paths. Sorting 950 specimens from 32 sites into 32 taxa, we identified consistent mobility patterns across time periods. In addition to the primary west-east trajectory from the sea to the interior, a secondary north-south inland vector was in use since the early Holocene. This study also revealed intensified shell transport during the middle Holocene, and a shift toward down-the-line exchange with reduced shell frequency at interior sites by the late Holocene, particularly in the Limarí Valley. Additionally, shell artifacts - ornaments and tools - were found more consistently in interior contexts. Together, these findings shed light on long-term human adaptation strategies in semiarid mountainous environments.
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    Trasplante hepático: Evolución, curva de aprendizaje y resultados después de los primeros 300 casos
    (2019) Quezada González, José Luis; Cancino, Alejandra; Arrese Jimenez, Marco Antonio; Wolff, Rodrigo; Benitez Gajardo, Carlos Esteban; Pattillo Silva, Juan Carlos; Gana Ansaldo, Juan Cristobal; Concha Pinto, Mario Rodrigo; Cortinez Fernandez, Luis Ignacio; Vera Alarcón, María Magdalena; Miranda, Paula; Rubilar, Francisco; Troncoso, Andrés; Briceno Valenzuela, Eduardo Andres; Dib Marambio, Martin Javier; Jarufe Cassis, Nicolas Patricio; Martínez, Jorge; Guerra Castro, Juan Francisco
    Liver transplantation (LT) is an option for people with liverfailure who cannot be cured with other therapies and for some people with liver cancer. Aim: To describe, and analyze the first 300 LT clinical results, andto establish our learning curve. Material and Methods: Retrospective cohortstudy with data obtained from a prospectively collected LT Program database.We included all LT performed at a single center from March 1994 to September2017. The database gathered demographics, diagnosis, indications for LT, surgicalaspects and postoperative courses. We constructed a cumulative summation testfor learning curve (LC-CUSUM) using 30-day post-LT mortality. Mortality at 30days, and actuarial 1-, and 5-year survival rate were analyzed. Results: A total of281 patients aged 54 (0-71) years (129 women) underwent 300 LT. Ten percentof patients were younger than 18 years old. The first, second and third indicationsfor LT were non-alcoholic steatohepatitis, chronic autoimmune hepatitis andalcoholic liver cirrhosis, respectively. Acute liver failure was the LT indication in51 cases (17%). The overall complication rate was 71%. Infectious and biliarycomplications were the most common of them (47 and 31% respectively). TheLC-CUSUM curve shows that the first 30 patients corresponded to the learningcurve. The peri-operative mortality was 8%. Actuarial 1 and 5-year survival rateswere 82 and 71.4%, respectively. Conclusions: Outcome improvement of a LTprogram depends on the accumulation of experience after the first 30 transplantsand the peri-operative mortality directly impacted long-term survival.