Resultados del tratamiento quirúrgico del dolor lumbar con instrumentación diapasón

Se presenta un estudio sobre 23 pacientes con patología lumbosacra tratados quirúrgicamente mediante artrodesis e instrumentación vertebral transpedicular tipo diapasón. El promedio de seguimiento ha sido de 25 meses (18-38). El dolor lumbar estaba relacionado en 10 casos con estenosis de canal, en 6 con espondilolistesis y en 7 con hernia discal y artrosis secundaria. Todos fueron instrumentados por vía posterior mediante fijación transpedicular y artrodesados posterolateralmente con injerto autólogo. Se consiguió una artrodesis sólida en un 96%. No se han presentado complicaciones preoperatorias. Ocho pacientes presentaron complicaciones en el postoperatorio inmediato. Observamos un desplazamiento de barra y un desanclaje del tornillo fuera del pedículo. Siguiendo los criterios de valoración de Henderson se ha conseguido un 96% de excelentes y buenos resultados.A series of 23 patient with lumbosacral pathology, surgically treated by posterior arthrodesis and vertebral diapason transpedicular fixation was retrospectively review. The average follow-up period was 25 months (18-38). The diagnosis was spinal stenosis in 10 cases, spondylolisthesis in 6, and disc herniation with secondary osteoartrhitis in 7 cases. Apart from transpedicular fixation all cases underwent posterolateral fusion with autogenous bone graft. A solid arthrodesis was achieved in a 96% of patients. There were no per-operative complication. Eight cases showed complications in the immediate postoperative period. We observed displacement of a bar and detachement of a screw out off the pedicle. According to Henderson's assessment criteria we obtained 96% of excellent and good results

Atlantic Ocean CO2 uptake reduced by weakening of the meridional overturning circulation

7 páginas, 4 figuras.-- Proyecto CarbochangeUptake of atmospheric carbon dioxide in the subpolar North Atlantic Ocean declined rapidly between 1990 and 2006. This reduction in carbon dioxide uptake was related to warming at the sea surface, which—according to model simulations—coincided with a reduction in the Atlantic meridional overturning circulation. The extent to which the slowdown of this circulation system—which transports warm surface waters to the northern high latitudes, and cool deep waters south—contributed to the reduction in carbon uptake has remained uncertain. Here, we use data on the oceanic transport of volume, heat and carbon dioxide to track carbon dioxide uptake in the subtropical and subpolar regions of the North Atlantic Ocean over the past two decades. We separate anthropogenic carbon from natural carbon by assuming that the latter corresponds to a pre-industrial atmosphere, whereas the remaining is anthropogenic. We find that the uptake of anthropogenic carbon dioxide—released by human activities—occurred almost exclusively in the subtropical gyre. In contrast, natural carbon dioxide uptake—which results from natural Earth system processes—dominated in the subpolar gyre. We attribute the weakening of contemporary carbon dioxide uptake in the subpolar North Atlantic to a reduction in the natural component. We show that the slowdown of the meridional overturning circulation was largely responsible for the reduction in carbon uptake, through a reduction of oceanic heat loss to the atmosphere, and for the concomitant decline in anthropogenic CO2 storage in subpolar waters.This work was supported by the Spanish Ministry of Sciences and Innovation and co-funded by the Fondo Europeo de Desarrollo Regional 2007 2012 (FEDER) through the CATARINA project (CTM2010-17141) and through EU FP7 project CARBOCHANGE `Changes in carbon uptake and emissions by oceans in a changing climate', which received funding from the European Commission's seventh Framework Programme EU under grant agreement no. 264879. The OVIDE research projectPeer reviewe