Resultados de la aplicación de algoritmos de manejo en la gestión clínica de un servicio de angiología y cirugía vascular. Análisis del período 1990 - 2001

Objetivo: Analizar el impacto de la gestión clínica en los indicadores basicos de calidad asistencial en un servicio de Cirugía Vascular durante un periodo de 10 años. Métodos: Analisis retrospectivo de los indicadores asistenciales del servicio de Angiología y Cirugía Vascular en el periodo 1990 - 2001 y la influencia que una guia de manejo clínico y la elaboración de unos estandares de calidad tienen sobre ellos. Se compara el periodo 1990 - 1994, previo a la aplicación de estas guias, con el periodo 1995 - 200 l. Resultados: Todos los indicadores de calidad asistencial analizados presentan una mejora evidente cuando se comparan ambos periodos. El nivel de seguridad asistencial médico-quirúrgico no se vio afectado por la aplicación de algoritmos de manejo y de guías de cuidados clínicos. Conclusiones: La gestión clínica de los servicos basada en el binomio coste - calidad puede asegurar la eficiencia de un servicio y optimizar los recursos sanitarios sin menoscabo de la calidad de los procedimientos asistenciales. Es posible definir el estandar de calidad por grupo de procedimientos, en función de la utilización de recursos hospitalarios y de las tasas de morbi-mortalidad

Complicaciones vasculares tras cateterismo cardíaco

Objetivos: Establecer la incidencia de complicaciones vasculares tras un cateterismo cardíaco y determinar los factores que influyen en la aparición de los mismos. Material y métodos: Revisión retrospectiva de los 3723 cateterismos cardíacos realizados en nuestro hospital durante un período de 50 meses. Se recogieron 32 traumatismos vasculares, distribuidos entre pseudoaneurismas, hematomas o hemorragias incoercibles, fístulas arteriovenosas e isquemias agudas por trombosis arterial. Se realizó un analisis estadístico mediante tablas de contingencia (método de Jicuadrado, con corrección de Yates). Resultados: La incidencia anual de traumatismos vasculares se encuentra alrededor del 1 %. La incidencia de traumatismos tras un cateterismo terapéutico es ligeramente superior a la incidencia tras un cateterismo diagnóstico, sin presentar diferencias significativas. La edad media del grupo de pacientes con traumatismo vascular (grupo estudio) es de 64'2 ± 1 '9 años, ligeramente superior a la edad media del grupo sin traumatismo vascular (grupo control) (61 '1 - 0'2 años). En ambos grupos predominaban los varones, pero en el grupo estudio dicho predominio es sensi blemente inferior (p 0'012) . En el grupo estudio la incidencia de pacientes obesos es superior con respecto al grupo control (p 0'024). El abordaje por vía humeral (p 0'03), el diametro de cateter mayor al 8F (p 0'001) Y la anticoagulación tras el cateterismo (p<0'001) son factores favorecedores par la aparición de un traumatismo vascular tras un cateterismo cardíaco

Combination of Tevatron searches for the standard model Higgs boson in the W+W- decay mode

We combine searches by the CDF and D0 Collaborations for a Higgs boson decaying to W+W?. The data correspond to an integrated total luminosity of 4.8 (CDF) and 5.4 (D0) fb?1 of p¯p collisions at ?s=1.96??TeV at the Fermilab Tevatron collider. No excess is observed above background expectation, and resulting limits on Higgs boson production exclude a standard model Higgs boson in the mass range 162?166 GeV at the 95% C.L

Measurement of the cross section for direct-photon production in association with a heavy quark in pp¯ collisions at vs=1.96 TeV

We report on a measurement of the cross section for direct-photon production in association with a heavy quark using the full data set of √s=1.96  TeV proton-antiproton collisions corresponding to 9.1  fb−1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron. The measurements are performed as a function of the photon transverse momentum, covering a photon transverse momentum between 30 and 300 GeV, photon rapidities |yγ|20  GeV, and jet rapidities |yjet|<1.5. The results are compared with several theoretical predictions.We are grateful to A. V. Lipatov, M. A. Malyshev, N. P. Zotov, F. Siegert, T. P. Stavreva, and J. F. Owens for providing theoretical predictions and for many useful discussions. We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A. P. Sloan Foundation; the Bundesministerium für Bildung und Forschung, Germany; the Korean World Class University Program, the National Research Foundation of Korea; the Science and Technology Facilities Council and the Royal Society, UK; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovación, and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; the Academy of Finland; the Australian Research Council (ARC); and the EU community Marie Curie Fellowship Contract No. 302103

Observation of the production of a W boson in association with a single charm quark

The first observation of the production of a W boson with a single charm quark (c) jet in p¯p collisions at √s=1.96  TeV is reported. The analysis uses data corresponding to 4.3  fb−1, recorded with the CDF II detector at the Fermilab Tevatron. Charm quark candidates are selected through the identification of an electron or muon from charm-hadron semileptonic decay within a hadronic jet, and a Wc signal is observed with a significance of 5.7 standard deviations. The production cross section σWc(pTc>20  GeV/c,|ηc|0.71 at the 95% confidence level, assuming that the Wc production through c to s quark coupling is dominant.We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A. P. Sloan Foundation; the Bundesministerium für Bildung und Forschung, Germany; the Korean World Class University Program, the National Research Foundation of Korea; the Science and Technology Facilities Council, the Royal Society and the Leverhulme Trust, U.K.; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovación, and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; the Academy of Finland; and the Australian Research Council (ARC)

Direct measurement of the total decay width of the top quark

We present a measurement of the total decay width of the top quark using events with top-antitop quark pair candidates reconstructed in the final state with one charged lepton and four or more hadronic jets. We use the full Tevatron run II data set of ?s=1.96 TeV proton-antiproton collisions recorded by the CDF II detector. The top quark mass and the mass of the hadronically decaying W boson are reconstructed for each event and compared with distributions derived from simulated signal and background samples to extract the top quark width (?top) and the energy scale of the calorimeter jets with in situ calibration. For a top quark mass M top=172.5 GeV/c2, we find 1.10<?top<4.05 GeV at 68% confidence level, which is in agreement with the standard model expectation of 1.3 GeV and is the most precise direct measurement of the top quark width to date.We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A.P. Sloan Foundation; the Bundesministerium für Bildung und Forschung, Germany; the Korean World Class University Program, the National Research Foundation of Korea; the Science and Technology Facilities Council and the Royal Society, UK; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovación, and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; the Academy of Finland; the Australian Research Council (ARC); and the EU community Marie Curie Fellowship Contract No. 302103

Measurement of the top-quark pair-production cross section in events with two leptons and bottom-quark jets using the full CDF data set

We present a measurement of the top-quark pair production cross section in proton-antiproton collisions at √s=1.96  TeV. The data were collected at the Fermilab Tevatron by the CDF II detector and correspond to an integrated luminosity of 8.8  fb−1, representing the complete CDF Run II data set. We select events consistent with the production of top-quark pairs by requiring the presence of two reconstructed leptons, an imbalance in the total event transverse momentum, and jets. At least one jet is required to be identified as consistent with the fragmentation of a bottom quark using a secondary-vertex-finding algorithm. The 246 candidate events are estimated to have a signal purity of 91%. We measure a cross section of σt¯t=7.09±0.84  pb, assuming a top-quark mass of 172.5  GeV/c2. The results are consistent with the standard model as predicted by next-to-leading-order calculations.We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A. P. Sloan Foundation; the Bundesministerium für Bildung und Forschung, Germany; the Korean World Class University Program, the National Research Foundation of Korea; the Science and Technology Facilities Council and the Royal Society, UK; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovación, and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; the Academy of Finland; the Australian Research Council (ARC)ARC; and the EU community Marie Curie Fellowship Contract No. 302103

Search for pair production of strongly interacting particles decaying to pairs of jets in pp¯ collisions at √s=1.96 TeV

We present a search for the pair production of a narrow nonstandard-model strongly interacting particle that decays to a pair of quarks or gluons, leading to a final state with four hadronic jets. We consider both nonresonant production via an intermediate gluon as well as resonant production via a distinct nonstandard-model intermediate strongly interacting particle. We use data collected by the CDF experiment in proton-antiproton collisions at √s=1.96  TeV corresponding to an integrated luminosity of 6.6  fb−1. We find the data to be consistent with nonresonant production. We report limits on σ(p¯p→jjjj) as a function of the masses of the hypothetical intermediate particles. Upper limits on the production cross sections for nonstandard-model particles in several resonant and nonresonant processes are also derived.We thank Martin Schmaltz, Gustavo Tavares, Can Kilic, Bogdan Dobrescu, Dirk Zerwas, and Felix Yu for useful suggestions and technical advice. We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A. P. Sloan Foundation; the Bundesministerium für Bildung und Forschung, Germany; the Korean World Class University Program and the National Research Foundation of Korea; the Science and Technology Facilities Council and the Royal Society, U.K.; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovación and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; the Academy of Finland; and the Australian Research Council (ARC)ARC

Measurement of W-boson polarization in top-quark decay using the full CDF Run II data set

We measure the polarization of W bosons from top-quark (t) decays into final states with a charged lepton and jets, t¯t→W+bW−¯b→ℓνbq¯q′¯b, using the full Run II data set collected by the CDF II detector, corresponding to an integrated luminosity of 8.7  fb−1. A model-independent method simultaneously determines the fraction of longitudinal (f0) and right-handed (f+) W bosons to yield f0=0.726±0.066(stat)±0.067(syst) and f+=−0.045±0.044(stat)±0.058(syst) with a correlation coefficient of −0.69. Additional results are presented under various standard model assumptions. No significant discrepancies with the standard model are observed.We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science, and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A. P. Sloan Foundation; the Bundesministerium für Bildung und Forschung, Germany; the Korean World Class University Program, the National Research Foundation of Korea; the Science and Technology Facilities Council and the Royal Society, U.K.; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovación, and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; the Academy of Finland; and the Australian Research Council (ARC)ARC