108 research outputs found
Determinantes de la calidad de vida relacionada con la salud de pacientes en diálisis de Uruguay
Ana I. Galain: Departamento de PsicologÃa Médica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay. -- Inés Olaizola: Servicio de Asistencia Renal Integral, SARI. Centro de Diálisis Ibirapitá, Montevideo, Uruguay.-- Laura Schwartzmann: Departamento de PsicologÃa Médica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.-- Carlos Zúñiga: Facultad de Medicina, Universidad Católica de Concepción, Concepción, Chile.-- Juan J. Dapueto: Departamento de PsicologÃa Médica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay. Contacto: Juan J. Dapueto. Dirección: Departamento de PsicologÃa Médica, Facultad de Medicina, Universidad de la República, Av. Italia 2870 piso 15, Montevideo11600, Uruguay. E-mail: [email protected] are limited studies reporting on the Health Related Quality of Life (HRQL) of patients with end stage renal disease living in non-industrialized countries. This study describes the underlying relationships among determinants of HRQL in patients under renal replacement treatment. A cross-sectional design was used with a sample of 243 patients attending five hemodialysis and peritoneal dialysis centers of Montevideo (mean age 56.6 years, SD 16.2; 58% males). A univariate linear regression analysis was performed for each independent variable. A total of 61 independent variables were included: biological/clinical, sociodemographic, and psychosocial. HRQL outcomes were evaluated using the SF-36 Health Survey eight subscales, Physical Component Summary (PCS) and Mental Component Summary (MCS) scores. Variables shown to have significant association in the univariate analysis (p<0.10) were included in a multivariate regression analysis. Ten regression models were studied, for the 8 SF-36 subscales, PCS and MCS scores. Fifteen variables were significant in the multivariable models; time in renal replacement treatment, urea, creatinine, haemoglobin, iron, hospitalizations, acute illness, blindness, age, gender, living with someone, working status, administration of antidepressants or antipsychotic medications, and
maintenance of sex life, explaining 43% of the variance of PCS and 35% of MCS. The type and relevance of the explanatory variables differed along the various dimensions of HRQL. As a conclusion we underline the entwining of biological, sociodemographic and psychosocial factors as determinants of health related quality of life patients with end stage renal disease, thus supporting the multidimensional definition and modelling of the construct.Existen pocos estudios sobre la percepción subjetiva de la calidad de vida relacionada con la salud (HRQL por sus siglas en inglés) en pacientes renales cursando su etapa terminal, que vivan en paÃses no industrializados. El propósito de este estudio fue comprender las relaciones subyacentes entre los diferentes determinantes de la calidad de vida relacionada con la salud, en los pacientes en tratamiento sustitutivo renal en Uruguay. Se realizó un estudio transversal en una muestra de 243 pacientes de cinco centros de hemodiálisis y diálisis peritoneal de la ciudad de Montevideo (edad media de 56,6 años, SD 16,2; 58% hombres). Se realizó un análisis de regresión lineal univariado para cada variable independiente. Se incluyó un total de 61 variables independientes biológicas/clÃnicas, sociodemográficas y psicosociales. La HRQL fue evaluada utilizando el cuestionario SF-36, que consta de ocho subescalas, más el Componente de Resumen FÃsico (PCS) y el Componente de Resumen Mental (MCS). Aquellas variables que mostraron una asociación significativa en el análisis univariado (p< 0.10) fueron incluidas en un análisis de regresión multivariado. Fueron estudiados diez modelos de regresión, para las 8 subescalas del SF-36, el PCS y MCS. Quince variables fueron significativas en los modelos multivariados: tiempo en tratamiento sustitutivo renal, urea, creatinina, hemoglobina, hierro, hospitalizaciones, enfermedades
agudas, ceguera, edad, género, vivir con alguien, situación laboral, administración de antidepresivos o de
antipsicóticos y mantenimiento de la vida sexual; explicando el 43% de la varianza de PCS y el 35% de MCS. El tipo y relevancia de las variables explicativas difieren a lo largo de las diversas dimensiones de la HRQL. Destacamos como conclusión el entrelazamiento de factores biológicos, sociodemográficos y psicosociales como determinantes de la calidad de vida relacionada con la salud en los pacientes renales cursando su etapa terminal, lo que apoya la definición y modelado multidimensional del constructo
Cinnamon Use in Type 2 Diabetes: An Updated Systematic Review and Meta-Analysis
PURPOSE Cinnamon has been studied in randomized controlled trials (RCTs) for its glycemic-lowering effects, but studies have been small and show conflicting results. A prior meta-analysis did not show significant results, but several RCTs have been published since then. We conducted an updated systematic review and meta-analysis of RCTs evaluating cinnamon’s effect on glycemia and lipid levels. METHODS MEDLINE, Embase, and Cochrane Central Register of Controlled Trials (CENTRAL) were searched through February 2012. Included RCTs evaluated cinnamon compared with control in patients with type 2 diabetes and reported at least one of the following: glycated hemoglobin (A1c), fasting plasma glucose, total cholesterol, low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), or triglycerides. Weighted mean differences (with 95% confidence intervals) for endpoints were calculated using random-effects models. RESULTS In a meta-analysis of 10 RCTs (n = 543 patients), cinnamon doses of 120 mg/d to 6 g/d for 4 to 18 weeks reduced levels of fasting plasma glucose (−24.59 mg/dL; 95% CI, −40.52 to −8.67 mg/dL), total cholesterol (−15.60 mg/dL; 95% CI, −29.76 to −1.44 mg/dL), LDL-C (−9.42 mg/dL; 95% CI, −17.21 to −1.63 mg/dL), and triglycerides (−29.59 mg/dL; 95% CI, −48.27 to −10.91 mg/dL). Cinnamon also increased levels of HDL-C (1.66 mg/dL; 95% CI, 1.09 to 2.24 mg/dL). No significant effect on hemoglobin A1c levels (−0.16%; 95%, CI −0.39% to 0.02%) was seen. High degrees of heterogeneity were present for all analyses except HDL-C (I2 ranging from 66.5% to 94.72%). CONCLUSIONS The consumption of cinnamon is associated with a statistically significant decrease in levels of fasting plasma glucose, total cholesterol, LDL-C, and triglyceride levels, and an increase in HDL-C levels; however, no significant effect on hemoglobin A1c was found. The high degree of heterogeneity may limit the ability to apply these results to patient care, because the preferred dose and duration of therapy are unclear
Relating gravitational wave constraints from primordial nucleosynthesis, pulsar timing, laser interferometers, and the CMB: implications for the early universe
We derive a general master equation relating the gravitational-wave
observables r and Omega_gw(f). Here r is the tensor-to-scalar ratio,
constrained by cosmic-microwave-background (CMB) experiments; and Omega_gw(f)
is the energy spectrum of primordial gravitational-waves, constrained e.g. by
pulsar-timing measurements, laser-interferometer experiments, and Big Bang
Nucleosynthesis (BBN). Differentiating the master equation yields a new
expression for the tilt d(ln Omega_gw(f))/d(ln f). The relationship between r
and Omega_gw(f) depends sensitively on the uncertain physics of the early
universe, and we show that this uncertainty may be encapsulated (in a
model-independent way) by two quantities: w_hat(f) and nt_hat(f), where
nt_hat(f) is a certain logarithmic average over nt(k) (the primordial tensor
spectral index); and w_hat(f) is a certain logarithmic average over w_tilde(a)
(the effective equation-of-state in the early universe, after horizon
re-entry). Here the effective equation-of-state parameter w_tilde(a) is a
combination of the ordinary equation-of-state parameter w(a) and the bulk
viscosity zeta(a). Thus, by comparing constraints on r and Omega_gw(f), one can
obtain (remarkably tight) constraints in the [w_hat(f), nt_hat(f)] plane. In
particular, this is the best way to constrain (or detect) the presence of a
``stiff'' energy component (with w > 1/3) in the early universe, prior to BBN.
Finally, although most of our analysis does not assume inflation, we point out
that if CMB experiments detect a non-zero value for r, then we will immediately
obtain (as a free by-product) a new upper bound w_hat < 0.55 on the
logarithmically averaged effective equation-of-state parameter during the
``primordial dark age'' between the end of inflation and the start of BBN.Comment: v1: 12 + 6 pages (main text + appendices), 7 figures; v2: fonts fixed
in figure
Scalar and Tensor Inhomogeneities from Dimensional Decoupling
We discuss some perturbative techniques suitable for the gauge-invariant
treatment of the scalar and tensor inhomogeneities of an anisotropic and
homogeneous background geometry whose spatial section naturally decomposes into
the direct product of two maximally symmetric Eucledian manifolds, describing a
general situation of dimensional decoupling in which external dimensions
evolve (in conformal time) with scale factor and internal
dimensions evolve with scale factor . We analyze the growing mode
problem which typically arises in contracting backgrounds and we focus our
attention on the situation where the amplitude of the fluctuations not only
depends on the external space-time but also on the internal spatial
coordinates. In order to illustrate the possible relevance of this analysis we
compute the gravity waves spectrum produced in some highly simplified model of
cosmological evolution and we find that the spectral amplitude, whose magnitude
can be constrained by the usual bounds applied to the stochastic gravity waves
backgrounds, depends on the curvature scale at which the compactification
occurs and also on the typical frequency of the internal excitations.Comment: 31 pages, Latex, DAMTP 96-92, UCM 96-04, to appear in Phys. Rev. D 55
(1997
Thermal history of the plasma and high-frequency gravitons
Possible deviations from a radiation-dominated evolution, occurring prior the
synthesis of light nuclei, impacted on the spectral energy density of
high-frequency gravitons. For a systematic scrutiny of this situation, the
CDM paradigm must be complemented by (at least two) physical
parameters describing, respectively, a threshold frequency and a slope. The
supplementary frequency scale sets the lower border of a high-frequency domain
where the spectral energy grows with a slope which depends, predominantly, upon
the total sound speed of the plasma right after inflation. While the infra-red
region of the graviton energy spectrum is nearly scale-invariant, the expected
signals for typical frequencies larger than 0.01 nHz are hereby analyzed in a
model-independent framework by requiring that the total sound speed of the
post-inflationary plasma be smaller than the speed of light. Current (e.g.
low-frequency) upper limits on the tensor power spectra (determined from the
combined analysis of the three large-scale data sets) are shown to be
compatible with a detectable signal in the frequency range of wide-band
interferometers. In the present context, the scrutiny of the early evolution of
the sound speed of the plasma can then be mapped onto a reliable strategy of
parameter extraction including not only the well established cosmological
observables but also the forthcoming data from wide band interferometers.Comment: 47 pages, 31 included figures, to appear in Classical and Quantum
Gravit
Financiamento e democratização do acesso à educação superior no Brasil: da deserção do Estado ao projeto de reforma
Gravitational Wave Experiments and Early Universe Cosmology
Gravitational-wave experiments with interferometers and with resonant masses
can search for stochastic backgrounds of gravitational waves of cosmological
origin. We review both experimental and theoretical aspects of the search for
these backgrounds. We give a pedagogical derivation of the various relations
that characterize the response of a detector to a stochastic background. We
discuss the sensitivities of the large interferometers under constructions
(LIGO, VIRGO, GEO600, TAMA300, AIGO) or planned (Avdanced LIGO, LISA) and of
the presently operating resonant bars, and we give the sensitivities for
various two-detectors correlations. We examine the existing limits on the
energy density in gravitational waves from nucleosynthesis, COBE and pulsars,
and their effects on theoretical predictions. We discuss general theoretical
principles for order-of-magnitude estimates of cosmological production
mechanisms, and then we turn to specific theoretical predictions from
inflation, string cosmology, phase transitions, cosmic strings and other
mechanisms. We finally compare with the stochastic backgrounds of astrophysical
origin.Comment: 99 pages, Latex, 17 figures. To appear in Physics Report. v4:
conceptual changes in sect. 7.
Portuguese Ministers, 1851-1999: Social Background and Paths to Power
DisponÃvel em:
http://193.136.113.6/Opac/Pages/Search/Results.aspx?SearchText=UID=bb8aa8d5-c6b6-466a-81bb-fe8a67693cee&DataBase=10449_UNLFCSHThis paper provides an empirical analysis of the impact of regime changes in the composition and patterns of recruitment of the Portuguese ministerial elite throughout the last 150 years. The ‘out-of-type’, violent nature of most regime transformations accounts for the purges in and the extensive replacements of the political personnel, namely of the uppermost officeholders. In the case of Cabinet members, such discontinuities did not imply, however, radical changes in their social profile. Although there were some significant variations, a series of salient characteristics have persisted over time. The typical Portuguese minister is a male in his midforties, of middle-class origin and predominantly urban-born, highly educated and with a state servant background. The two main occupational contingents have been university professors - except for the First Republic (1910-26) - and the military, the latter having only recently been eclipsed with the consolidation of contemporary democracy. As regards career pathways, the most striking feature is the secular trend for the declining role of parliamentary experience, which the democratic regime did not clearly reverse. In this period, a technocratic background rather than political experience has been indeed the privileged credential for a significant proportion of minister
Stochastic backgrounds of relic gravitons: a theoretical appraisal
Stochastic backgrounds or relic gravitons, if ever detected, will constitute
a prima facie evidence of physical processes taking place during the earliest
stages of the evolution of the plasma. The essentials of the stochastic
backgrounds of relic gravitons are hereby introduced and reviewed. The pivotal
observables customarily employed to infer the properties of the relic gravitons
are discussed both in the framework of the CDM paradigm as well as in
neighboring contexts. The complementarity between experiments measuring the
polarization of the Cosmic Microwave Background (such as, for instance, WMAP,
Capmap, Quad, Cbi, just to mention a few) and wide band interferometers (e.g.
Virgo, Ligo, Geo, Tama) is emphasized. While the analysis of the microwave sky
strongly constrains the low-frequency tail of the relic graviton spectrum,
wide-band detectors are sensitive to much higher frequencies where the spectral
energy density depends chiefly upon the (poorly known) rate of
post-inflationary expansion.Comment: 94 pages, 32 figure
Suicidal ideation and suicide attempts in bipolar disorder type I: an update for the clinician
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