858 research outputs found
36 Months Survivability And Its Predictors In Patients With Chronic Heart Failure And Decreased Fraction Of Left Ventricular Ejection Depending On Sex
Aim of the work: to compare survivability parameters during 36 months and their predictors among men and women with chronic heart failure and decreased fraction of left ventricular ejection.Materials and methods: the research included 356 patients with CHF (NYHA ІІ –ІV) with decreased LVEF<40 %, 18–75 years old. Using Kaplan-Meier method, there was analyzed the survivability in men and women during 36 months, then there were analyzed independent factors that influenced survivability terms depending on sex using the multiple logistic regression.Results. Our analysis of the survivability of patients with CHF with decreased LVEF demonstrated that the cumulative survival after 3 years of observation was 49 and 51 % for men and women, respectively. The curves of 36 months survivability didn\u27t reliably differ. At the analysis of factors, associated with the bad prognosis, there were observed differences between groups of men and women with CHF. Thus, in men the predictors of 36 month survival were: the thickness of the right ventricle wall, size of the right atrium, end-diastolic volume and end-systolic volume of LV, indices of EDV and ESV of LV, urinary acid level, value of LVEF. In women the predictors of survivability during 3 years were the following parameters: BMI, DM type 2 in an anamnesis, end-diastolic size of LV, end-systolic size of LV, blood glucose level, LVEF.Conclusion. The survivability of men and women with CHF with decreased LVEF during 36 months didn\u27t reliably differ and was 49 and 51 % respectively. But predictors of the lethal outcome in men and women essentially differed during 36 months, and their number is essentially higher in men
Metallic water: transient state under ultrafast electronic excitation
The modern means of controlled irradiation by femtosecond lasers or swift
heavy ion beams can transiently produce such energy densities in samples that
reach collective electronic excitation levels of the warm dense matter state
where the potential energy of interaction of the particles is comparable to
their kinetic energies (temperatures of a few eV). Such massive electronic
excitation severely alters the interatomic potentials, producing unusual
nonequilibrium states of matter and different chemistry. We employ density
functional theory and tight binding molecular dynamics formalisms to study the
response of bulk water to ultrafast excitation of its electrons. After a
certain threshold electronic temperature, the water becomes electronically
conducting via the collapse of its band gap. At high doses, it is accompanied
by nonthermal acceleration of ions to a temperature of a few thousand Kelvins
within sub-100 fs timescales. We identify the interplay of this nonthermal
mechanism with the electron-ion coupling, enhancing the electron-to-ions energy
transfer. Various chemically active fragments are formed from the
disintegrating water molecules, depending on the deposited dose.Comment: to be submitte
Search for ionized jets towards high-mass young stellar objects
We are carrying out multi-frequency radio continuum observations, using the
Australia Telescope Compact Array, to systematically search for collimated
ionized jets towards high-mass young stellar objects (HMYSOs). Here we report
observations at 1.4, 2.4, 4.8 and 8.6 GHz, made with angular resolutions of
about 7, 4, 2, and 1 arcsec, respectively, towards six objects of a sample of
33 southern HMYSOs thought to be in very early stages of evolution. The objects
in the sample were selected from radio and infrared catalogs by having positive
radio spectral indices and being luminous (L_bol > 20,000 L_sun), but
underluminous in radio emission compared to that expected from its bolometric
luminosity. This criteria makes the radio sources good candidates for being
ionized jets. As part of this systematic search, two ionized jets have been
discovered: one previously published and the other reported here. The rest of
the observed candidates correspond to three hypercompact hii regions and two
ultracompact hii regions. The two jets discovered are associated with two of
the most luminous (70,000 and 100,000 Lsun) HMYSOs known to harbor this type of
objects, showing that the phenomena of collimated ionized winds appears in the
formation process of stars at least up to masses of ~ 20 M_sun and provides
strong evidence for a disk-mediated accretion scenario for the formation of
high-mass stars. From the incidence of jets in our sample, we estimate that the
jet phase in high-mass protostars lasts for 40,000 yr.Comment: Accepted for publication in the Astrophysical Journal. (53 pages, 22
Figures) (Color figures were degraded to comply with arXiv requirements
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