Search

Introducción: Las alteraciones fisiopatológicas que ocurren a nivel pulmonar en la infección por COVID 19 pueden generar una serie de complicaciones infrecuentes como el neumotórax que se desarrolla tanto en las etapas agudas como durante la recuperación de esta enfermedad. Objetivo: Proporcionar información acerca de las complicaciones tardías de la neumonía por COVID 19 mediante la descripción de un caso clínico. Material y métodos: Estudio descriptivo retrospectivo, descripción de un caso clínico. Resultados: Se presenta el caso de un paciente de 51 años con neumonía por COVID 19 en etapa de convalecencia que acude por un control médico y seguimiento presentando dificultad respiratoria. Paciente taquipneico, hipoxémico, auscultación pulmonar alterada. Conclusión: La infección por COVID 19 es un factor de riesgo per se de neumotórax aun en etapas tardías de la enfermedad por lo que es importante continuar con el seguimiento médico de estos pacientes.

RESUMEN Se estudiaron 217 lactantes y 149 preescola-res, bien nutridos de bajo nivel socio—economi-co. La incidencia de Ferropenia fue mayor enlactantes (38,4%) que en preescolares (17,2%).Igualmente el porcentaje de Anemia Ferroprivafue mayor aunque en menor grado en lactantes(33,0%) que en preescolares (8,5%). AGRADECIMIENTOS A.:Dr. Hernan TaboadaHematologo Hospital Josefma Martinez, Santiago.Q.F. Lola Ramos I.Jefe Laboratorio Clinico Central, Hospital RegionalTalca.REFERENCIASTaboada, H.: "Rol del Hierro en la Nutricion Infan-til", I parte Rev. Chil. Ped, 54: 47, 1983.Grebe, G.; Lira, P.; Faradi, A.: "Cajencia de Hierrode Oiigen Nutricional", Rev. Med. Ch. 104: 954, 1976. Taboada, H.: "Rol del Hierro en la Nutricion Infan-til", II paite, Rev. OiU. Fed., 54: 132, 1983.Rios, "E.L.: "Metabolismo del Hierro en el Hombre",Apartado Docente, NO, 50, 1977.Joint FAO/WHO.: Expert group on Requirements ofAscorbic Acid, Vitamin D., Vatamin B12, Folate andIron. Wld. Hlth. Org. Techn. Rep. Sei. NO 452

We present the analysis of X-ray spectral varability made on a sample of 7 Seyfert 1 bright galaxies, using XMM-Newton data. From the "XMM-Newton Science Archive" we selected those bright Seyfert 1 showing one or more prominent flares in their 2-10 keV light curves. For each of them we extracted spectra in 3 different time intervals: before, during and after the flare. We fitted them with a simple power law and then shifted a narrow emission and absorption line template across the 2.5-10 keV data, in order to investigate the presence of line-like features with a confidence level greater than 99%. Some highly significant features were detected in 3 out of 7 sources studied. In particular, the 3 sources, namely PG 1211+143, NGC 4051 and NGC 3783, showed the presence of a variable emission feature in the 4.5-5.8 keV band, characterized by an increase of its intensity after the flare peak. Because of the observed variability pattern, this feature seems to be ascribable to a reverbered redshifted relativistic component of the Fe K line. Comment: 4 pages, 9 figures, accepted for publication in Astronomische Nachrichten, proceedings of the ESAC Workshop "Variable and Broad Iron Lines around Black Holes"

Altered martial indices before orthopedic surgery are associated with higher rates of complications and greatly affect the patient&rsquo, s functional ability. Oral supplements can optimize the preoperative martial status, with clinical efficacy and the patient&rsquo, s tolerability being highly dependent on the pharmaceutical formula. Patients undergoing elective hip/knee arthroplasty were randomized to be supplemented with a 30-day oral therapy of sucrosomial ferric pyrophosphate plus L-ascorbic acid. The tolerability was 2.7% among treated patients. Adjustments for confounding factors, such as iron absorption influencers, showed a relevant response limited to older patients (&ge, 65 years old), whose uncharacterized Hb loss was averted upon treatment with iron formula. Older patients with no support lost &minus, 2.8 &plusmn, 5.1%, while the intervention group gained +0.7 &plusmn, 4.6% of circulating hemoglobin from baseline (p = 0.019). Gastrointestinal diseases, medications, and possible dietary factors could affect the efficacy of iron supplements. Future opportunities may consider to couple ferric pyrophosphate with other nutrients, to pay attention in avoiding absorption disruptors, or to implement interventions to obtain an earlier martial status optimization at the population level.

The High Voltage Padova Test Facility (HVPTF) is an experimental device for investigating HV insulation in vacuum, in support of the realization of MITICA, the prototype of a neutral beam injector for ITER. The facility investigates the physical phenomena underlying voltage holding in vacuum, such as the mechanisms causing breakdowns and the electrode conditioning process, along with testing technical solutions to increase the breakdown threshold. Inside a high vacuum chamber, two stainless steel electrodes, separated by a few centimetres gap, can achieve HV values up to 400 kV each. The conditioning process consists of the gradual increase of the breakdown voltage in time, until the system achieves a saturation value. Between two consecutive breakdown events, current micro-discharges involving the electrodes are observed; high energy X-rays (up to hundreds of keV) and a global increase of gas emission (in particular H2 and CO2 are detected by the Residual Gas Analyser) are measured in correspondence to the current events. Three new Xrays detectors have been recently installed: a small LYSO (4 × 4 × 20 mm3), a LaBr3 (1" x 3/4") and a thin YAP (1"x 2 mm) scintillating crystals, coupled to photomultipliers. They all are small sized scintillators, with very fast pulses (40-100 ns) in order to minimize pile-up effects during the high intensity discharges. However, the high Z and densities guarantee a full energy absorption of the X-rays (they can measure up to 500 keV), with a significant probability, in spite of the small sizes. Energy resolutions are less than 9%. In this contribution we present a characterization of the micro-discharge dynamics occurring during the conditioning phase, focusing on the new details uncovered via the new diagnostics.

The High Voltage Padova Test Facilities (HVPTF) is a R&D project focused on understanding the physical processes behind breakdown and micro-discharges in high-voltage insulation, as well as developing new diagnostics, models, and operational modes to address these challenges and aid in the stable operation of MITICA. The X-rays produced during breakdown have a spectrum that extends from low energy (keV) up to several hundreds of keV and a flux that can reach 106 photons/cm2s. This paper shows the development and preliminary results of a newly designed X-Ray diagnostic based on Gas Electron Multiplier (SXR-GEM). This detector is able to stand very high rate (> MHz) in single photon counting mode and can cover the energy range from 3-50 keV. The XR-GEM detector is equipped with anodic pads (256 pads 6x6 mm2) readout with a new data acquisition system called GEMINI, which gives the possibility to obtain a counting rate of several MHz and sub-ms time resolution together with mm spatial resolution. Preliminary measurement shows that this kind of diagnostic is able to reconstruct the time evolution of the discharge at very high rates and to provide X-rays imaging.

Localized heating has been observed in unexpected positions on anodic surfaces in a multi-electrode device insulated by vacuum gaps. In double polarity experiments, a counter-intuitive behavior of current-voltage characteristic has also been observed. The phenomena could depend on a cascade effect of charged particles exchanged between electrodes and on a mutual correlation of particle trajectories between electrode surfaces occurring during the high voltage conditioning phase. Attractors regions ascribed to regenerative processes of charged particles between cathode and anode have been identi fi ed thanks to numerical simulations The position of the attractors depends only on electrode shape and the ratios of applied voltages. This fi nding suggests new perspectives in neutrons sources applications, where recurrent impacts of focused high energy hydrogen isotopes take place on solid hydride targets supported by metallic electrodes insulated by vacuum gaps.

High Voltage Padova Test Facility (HVPTF) is an experimental device realized to investigate the in vacuum high voltage insulation aspects in support of MITICA, the neutral beam injector prototype for ITER. Moreover, the experiment aims to give a contribution on the understanding of the voltage holding in vacuum, as a physical phenomenon. The two stainless steel electrodes, with few cms of gap in a high vacuum chamber, achieve a saturation breakdown value after about ten hours. A highly time resolved X-rays diagnostic has been recently installed in the device, measuring the X events (single events are detected) produced during the high voltage (up to 400 kV) conditioning: high energy peaks are observed in correspondence to the current peaks collected by the electrodes. This contribution presents a characterization of the current and the X-rays events in terms of frequency, amplitude and their occurrence with respect to the tension between the electrodes.