Resilient Nurses in the COVID-19 Compared With Non-COVID-19 Wards

INTRODUCTION

Owing to daily exposure to high job stress, nurses need to use coping techniques. One of the coping strategies helping a person to cope with stressful situations effectively is resiliency skills. The aim of this cross-sectional study was to examine the factors related to nurses' resiliency during the coronavirus disease 2019 (COVID-19) epidemic.

METHODS

The resiliency of 288 nurses, 145 nurses from the COVID-19 wards , and 143 nurses from other wards were compared using 25-item Connor & Davidson Resilience Questionnaire. This study was conducted in 2021 in four referral hospitals at Shiraz.

RESULTS

The mean age of participants was 32 y. The average resilience score in the in the participants worked in COVID-19 wards was 95.30 for men and 87.72 for women, and in the non-COVID-19 wards was 85.82 for men and 88.48 for women. The mean resiliency scores of nurses working in COVID-19 and non-COVID-19 wards did not show a statistically significant difference. Factors affecting resilience included age, employment status, gender, and job expectancy.

CONCLUSIONS

In this study, the resiliency of nurses working in COVID-19 wards did not differed from that of working in non-COVID-19 ones. This result should be further investigated and elaborated. Health policymakers should consider job expectation, gender, age, and employment status of nurses when making plans for future pandemics.

Quantitative risk assessment of accidental points in the area of Shahid Beheshti field to Abuzar Square in Yazd with the method of accidents rate - severity index

Introduction: Accidents are one of the biggest public health problems in the world. At the same time, most young victims are in good health before the accident. World Health Organization studies indicate that in 2020 road accidents will be one of three of the three leading causes of death globally. Materials and Methods: Due to selecting the inner-city route, this study identified the accident hot zones by the number-accident intensity index method in one year. The table of coefficients proposed by the state of Georgia was used to weigh the severity of the accidents (injuries, deaths, and damages). Results: In this study, six spatial units were identified as hot zones ( 9/1% ), and 19 spatial units were identified as yellow zones ( 28/8% ); as. Finally, 41 spatial units ( 4100 meters from 6600 meters ) were identified as cold zones ( 62/1% ). Conclusion: The most important ways to reduce traffic accidents include the review of traffic signs in terms of the number, size, location, height, and the installation of the speed breaker in the spatial units as hot zones, the construction of an underpass, and the structure of pedestrian bridges with embedding the escalator in some important routs ( hot zones ), developing a comprehensive and long– term training program for improving the driving culture, etc.

Efficient optical trapping with cylindrical vector beams

Radially and azimuthally polarized beams can create needle-like electric and magnetic fields under tight focusing conditions, respectively, and thus have been highly recommended for optical manipulation. There have been reports on the superiority of these beams over the conventional Gaussian beam for providing a larger optical force in single beam optical trap. However, serious discrepancies in their experimental results prevent one from concluding this superiority. Here, we theoretically and experimentally study the impact of different parameters - such as spherical aberration, the numerical aperture of the focusing lens, and the particles' size - on optical trapping stiffness of radially, azimuthally, and linearly polarized beams. The result of calculations based on generalized Lorenz-Mie theory, which is in good agreement with the experiment, reveals that the studied parameters determine which polarization state has the superiority for optical trapping. Our findings play a crucial role in the development of optical tweezers setups and, in particular, in biophysical applications when laser-induced heating in the optical tweezers applications is the main concern.

Deconvolution based photoacoustic reconstruction with sparsity regularization

In most photoacoustic tomography (PAT) reconstruction approaches, it is assumed that the receiving transducers have omnidirectional response and can fully surround the region of interest. These assumptions are not satisfied in practice. To deal with these limitations, we present a novel deconvolution based photoacoustic reconstruction with sparsity regularization (DPARS) technique. The DPARS algorithm is a semi-analytical reconstruction approach in which the projections of the absorber distribution derived from a deconvolution-based method are computed and used to generate a large linear system of equations. In these projections, computed over limited viewing angles, the directivity effect of the transducer is taken into account. The distribution of absorbers is computed using a sparse representation of absorber coefficients obtained from the discrete cosine transform. This sparse representation helps improve the numerical conditioning of the system of equations and reduces the computation time of the deconvolution-based approach by one order of magnitude relative to Tikhonov regularization. The algorithm has been tested in simulations, and using two-dimensional and three-dimensional experimental data obtained with a conventional ultrasound transducer. The results show that DPARS, when evaluated using contrast-to-noise ratio and root-mean-square errors, outperforms the conventional delay-and-sum (DAS) reconstruction method.

Does calcium score in great pelvic vessels predict colorectal anastomotic leakage? A prospective study of one hundred anastomoses

BACKGROUND

Anastomotic leakage is one of the most severe surgical complications following surgery. This prospective study was designed to investigate an association between the calcification in the descending aorta and its major branches using a calcium-scoring software and colorectal anastomotic leakage.

METHODS

From January 2012 to March 2013, one hundred patients underwent surgeries involving colorectal anastomosis procedures. Calcium score in descending aorta and great pelvic vessels was measured using the Syngo-CT 2006G-W software. A questionnaire was completed containing demographic and underlying risk factors suspicious to be associated with anastomotic leakage, in addition to surgical characteristics data.

RESULTS

55 males and 45 females entered the study with the mean age of 63.70±7.17 years. The average duration time of surgery was 149.30±20.24 minutes. The type of surgery was elective for 90 patients and emergency for 10 others. The mean calcium score was higher in greater arteries as in abdominal aorta and common iliac arteries in comparison to the other pelvic vessels. Comparing two groups of patients with and without anastomotic leakage, the calcium score was higher in descending aorta and all great pelvic vessels of patients with colorectal anastomotic leakage (P<0.001). One patient (1%) died due to postoperative anastomotic leakage two weeks after the surgery.

CONCLUSIONS

Atherosclerotic calcification in the descending aorta and its major branches can be considered as a risk factor in the development of colorectal anastomotic leakage. (Acta gastroenterol. belg., 2016, 79, 415-420).

CoolClot, a novel hemostatic agent for controlling life-threatening arterial bleeding

BACKGROUND:

Uncontrolled bleeding is the first leading cause of preventable death in the battlefield and the 2nd cause of mortality in civil accidents. Incompressible hemorrhage control is among the interventions that drastically increase the survival rate in wound individuals. We have previously shown that a certain mixture of bentonite and zeolite minerals can significantly decrease the bleeding in rats.

METHODS:

In this study, nine healthy hybrid dogs were selected and after induction of anesthesia with ether, either arterial puncture by a needle or arteriotomy was performed on both groin regions of the dogs. For control arteries (either the right or left femoral artery), only pressure by sterilized gauze was performed, while for the femoral arteries of the opposite side, our invented hemostatic agent, namely CoolClot, was topically used before applying the pressure. In the second stage of the study, to assess the coagulation time, blood samples were collected from 10 volunteer students.

RESULTS:

CoolClot significantly decreased the bleeding time in animals whose femoral arteries were cut or punctured. In the human phase of the study, the mean coagulation time in control blood samples was 253.4±44.1 seconds, whereas it was 149.5±50.0, 162.3±74.6 and 143.4±114.6 seconds, respectively in blood samples treated with bentonite, zeolite and CoolClot (P<0.05).

CONCLUSIONS:

As controlling bleeding after a life-threatening arterial damage is critical for increasing the chance of survival, the results obtained in this study indicate the significant efficacy of CoolClot in shortening the bleeding time. Our experiments also indicate that CoolClot can significantly reduce the clotting time in human blood samples.

Corrosion behavior of pulse electrodeposited nanostructure Ni-SiC composite coatings

Ni-SiC nano-composite coatings with various contents of SiC were prepared by pulse electrodeposition from a modified Watts bath containing SiC nano-particles. The effect of SiC concentration, current density, duty cycle and pulse frequency on the corrosion behavior of the coatings was investigated by means of potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) methods. It has been found that the Ni-SiC composite coatings show better corrosion resistance in a 3.5% NaCI solution than pure nickel. The corrosion resistance of the coatings increases by increasing the amount of embedded SiC particles. This improvement can be attributed to the morphology and the crystallographic texture of the coatings.

DXRaySMCS: a user-friendly interface developed for prediction of diagnostic radiology X-ray spectra produced by Monte Carlo (MCNP-4C) simulation

In this work, the general purpose Monte Carlo N-particle radiation transport computer code (MCNP-4C) was used for the simulation of X-ray spectra in diagnostic radiology. The electron's path in the target was followed until its energy was reduced to 10 keV. A user-friendly interface named 'diagnostic X-ray spectra by Monte Carlo simulation (DXRaySMCS)' was developed to facilitate the application of MCNP-4C code for diagnostic radiology spectrum prediction. The program provides a user-friendly interface for: (i) modifying the MCNP input file, (ii) launching the MCNP program to simulate electron and photon transport and (iii) processing the MCNP output file to yield a summary of the results (relative photon number per energy bin). In this article, the development and characteristics of DXRaySMCS are outlined. As part of the validation process, output spectra for 46 diagnostic radiology system settings produced by DXRaySMCS were compared with the corresponding IPEM78. Generally, there is a good agreement between the two sets of spectra. No statistically significant differences have been observed between IPEM78 reported spectra and the simulated spectra generated in this study.

Progression of metastatic human prostate cancer to androgen independence in immunodeficient SCID mice

Prostate cancer mortality results from metastasis to bone and hormone-independent tumor growth. Models to study these progressive changes are lacking. Here we describe the propagation of advanced human prostate cancer by direct transfer of surgical samples from patients into immune-deficient male SCID mice. Explants from six of eight patients formed prostate tumors and two showed unique cytogenetic, biologic and molecular features that were retained through six or more passages. One grew in an androgen-independent fashion, whereas the second formed tumors that regressed following castration then regrew. Micrometastatic disease was detected in the hematopoietic tissues of half of the recipient mice. Thus selected specimens of advanced human prostate cancer can be propagated in SCID mice in a manner that recapitulates the clinical transition from androgen-sensitive to androgen-independent growth, accompanied by micrometastasis.