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Search Results: 1 - 10 of 10389 matches for " Rodrigo; Barja "
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La enfermedad mortal
Juan Barja
Política y Sociedad , 2000, DOI: -
Abstract: Sin resumen
Razón cintura estatura como predictor de riesgo cardiometabólico en ni?os y adolescentes
Arnaiz,Pilar; Acevedo,Mónica; Díaz,Carlos; Bancalari,Rodrigo; Barja,Salesa; Aglony,Marlene; Cavada,Gabriel; García,Hernán;
Revista chilena de cardiología , 2010, DOI: 10.4067/S0718-85602010000300001
Abstract: background: among children both general and visceral obesity are associated with increased cardio-metabolic risk. the increasing prevalence of the metabolic syndrome (ms) in children and adolescents increases cardiovascular risk. studies of new clinical markers which can easily and accurately predict ms in children and adolescents are needed. aim: to compare zbmi and waist to height ratio (whr) as predictors of ms in chilean children. method: we performed a crossectional study of 618 schoolchildren, age 11 ± 2 years, 52 % females, 190 eutrophic, 174 overweight, 254 obese, from middle and low social economic strata from the santiago urban área. we determined weight, height, waist circumference, blood pressure and fasting lipids and glycemia. ms diagnosis was based on the presence of > 3 cook criteria. ms was modeled in function of whr and z score bmi, through logistic regression models. roc curves were used to compare zbmi and whr as predictors of ms. the cutoff point by youden índex was used. results: the prevalence of ms was 15%. mean zbmi was +1.22 ± 0.90 and whr 0.52 ± 0.07. cutoff point for ms were: whr 0,55 (sensitivity 72%, specificity 70%)andzbmi: 1.76 (sensitivity 71%, specificity 74%). conclusions: both whr and zbmi similarly predicted cardio metabolic risk in children and adolescents. the greater feasibility of calculating whr makes it a good tool for defining risk in this group. a cutoff point >0.55 might be a good predictor of ms in children and adolescents .
Localización de la cadena mamaria interna para el tratamiento de cáncer mamario con radioterapia.
Pe?afiel Maldonado, Paola T.M..,Araya González, Amadiel T.M.,Hepp De Los Ríos, Rodrigo Dr,Solé Barja, Claudio Dr.
Alasbimn Journal , 1999,
Abstract: El compromiso de la Cadena Mamaria Interna (CMI) en el cáncer de mama con compromiso axilar, supera el 20%, independiente de la ubicación del primario en la mama. De lo anterior se desprende la importancia de su correcta ubicación, para asegurar su irradiación a dosis adecuadas.Desde 1996 se realiza en nuestro instituto la localización de la CMI, mediante la técnica cintigráfica descrita por Ege, utilizando como radiofármaco Tc99m – Dextran, en todas las pacientes con indicación de irradiación de la misma. Se obtienen imágenes antero -posteriores y laterales, dando la ubicación respecto a la línea media (LM) y su profundidad, respectivamente. Estos datos fueron utilizados para determinar el tama o del campo de tratamiento así como la energía de los electrones a utilizar en la irradiación de los ganglios de la CMI. Al analizar los resultados con respecto a profundidad y distancia de LM en los 178 casos estudiados en el período 1996-1998 es evidente que, si bien las medianas de ambos valores son similares a los estándares tradicionales, la dispersión es importante. Esta técnica permite personalizar el campo de tratamiento y elegir la energía más adecuada.In breast cancer patients, the internal mammary chain (IMC) is involved in more than 20% when the axilla is histologically positive, regardless of the tumor site in the breast. To be treated by radiotherapy, the IMC should be localized as accurately as possible.Since 1996, we have used in our Institute the technique originally described by Ege in 1972, with Tc99m - Dextran, in all patients with a medical indication of IMC irradiation (i.e. axillary node involvement). Antero-posterior and lateral views are obtained to localize the IMC in relation to the median line and to estimate its depth, respectively. This information was used to determine the radiation field size and the energy of the electrons to be included in a mixed-beam technique.One hundred and seventy-eight patients were analyzed. Results showed that, even if median values in terms of location and depth were concordant with accepted standard values, the statistical deviations were wide. These personal variations seem to justify the use of techniques to individualize the treatment field and the choice of electron energy.
Alimentación en el colegio
Salesa Barja Y.
Revista chilena de pediatría , 2005,
Abstract:
Generalized Clifford-Severi Inequality and the Volume of Irregular Varieties
Miguel A. Barja
Mathematics , 2013, DOI: 10.1215/00127094-2871306
Abstract: We give a sharp lower bound for the selfintersection of a nef line bundle $L$ on an irregular variety $X$ in terms of its continuous global sections and the Albanese dimension of $X$, which we call the Generalized Clifford-Severi inequality. We also extend the result to nef vector bundles and give a slope inequality for fibred irregular varieties. As a byproduct we obtain a lower bound for the volume of irregular varieties; when $X$ is of maximal Albanese dimension the bound is $Vol(X) \geq 2 n! \chi\omega_X$ and it is sharp.
Numerical bounds of canonical varieties
Miguel A. Barja
Mathematics , 1999,
Abstract: We study lower bounds for the self-intersection of the canonical divisor of "canonical varieties" (i.e. varieties whose canonical linear system gives a birational map). We give some improvements for the known results in the case of surfaces and new bounds for the case of canonical threefolds.
Lower bounds of the slope of fibred threefolds
Miguel A. Barja
Mathematics , 1999,
Abstract: We study from a geographical point of view fibrations of threefolds over smooth curves, such that the general fibre is of general type. We prove the non-negativity of certain relative invariants under general hypotheses and give lower bounds for the self-interssection of the relative canonical divisor of the fibration, depending on other relative invariants. We also study the influence of the relative irregularity on these bounds. A more detailed study of the lowest cases of the bounds is given.
Debe efectuarse la ablación en todo paciente con síndrome de Wolff-Parkinson-White asintomático?
Luis D. Barja,Jorge Scaglione
Revista Argentina de Cardiología , 2007,
Abstract:
Stability conditions and positivity of invariants of fibrations
Miguel A. Barja,Lidia Stoppino
Mathematics , 2012,
Abstract: We study three methods that prove the positivity of a natural numerical invariant associated to $1-$parameter families of polarized varieties. All these methods involve different stability conditions. In dimension 2 we prove that there is a natural connection between them, related to a yet another stability condition, the linear stability. Finally we make some speculations and prove new results in higher dimension.
Stability and singularities of relative hypersurfaces
M. A. Barja,L. Stoppino
Mathematics , 2014, DOI: 10.1093/imrn/rnv158
Abstract: We study relative hypersurfaces over curves, and prove an instability condition for the fibres. This gives an upper bound on the log canonical threshold of the relative hypersurface. We compare these results with the information that can be derived from Nakayama's Zariski decomposition of effective divisors on relative projective bundles.
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