work index
Recently Published Documents


TOTAL DOCUMENTS

360
(FIVE YEARS 142)

H-INDEX

22
(FIVE YEARS 3)

Cardiology ◽  
2022 ◽  
Author(s):  
Zubeyde Bayram ◽  
Cem Dogan ◽  
Suleyman Cagan Efe ◽  
Ali Karagoz ◽  
Busra Guvendi ◽  
...  

Background: Right ventricular (RV) failure is an important cause of morbidity and mortality in patients with left ventricular (LV) end-stage heart failure (ESHF). Pulmonary artery pulsatility index (PAPi) and right ventricular stroke work index (RVSWI) are invasive parameters related to RV function. This study aimed to investigate the prognostic impact of PAPi and RVSWI in these patients. Methods and Results: In this study, 416 patients with ESHF were included. The adverse cardiac event (ACE) was defined as left ventricular assist device (LVAD) implantation, urgent heart transplantation, or cardiac mortality. There were 218 ACE cases and 198 non-ACE cases over a median follow-up of 503.50 days. Patients with ACE had lower PAPi and similar RVSWI compared to those without ACE (3.1±1.9 vs. 3.7±2.3, P=0.003 and 7.3±4.9 vs. 6.9±4.4, P=0.422, respectively). According to the results of multivariate analysis, while PAPi (from 2 to 5.65) was associated with ACE, RVSWI (from 3.62 to 9.75) was not associated with ACE (HR: 0.75, 95% CI (0.55-0.95), P=0.031; HR: 0.79, 95% CI: (0.58-1.09), P=0.081, , respectively). Survival analysis revealed that PAPi ≤2.56 was associated with a higher ACE risk compared to PAPi >2.56 (HR: 1.46, 95% CI: 1.11-1.92, P=0.006). PAPi ≤2.56 could predict ACE with 56.7% sensitivity and 51.3% specificity at one year. Furthermore, the association between RVSWI and ACE was nonlinear (J-curve pattern). Low and high values seem to be associated with higher ACE risk compared to intermediate values. Conclusion: The low PAPi was an independent risk for ACE and it had a linear association with it. However, RVSWI seems to be have a nonlinear association with ACE (J-curve pattern).


Diagnostics ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 57
Author(s):  
Maria-Luiza Luchian ◽  
Andreea Motoc ◽  
Stijn Lochy ◽  
Julien Magne ◽  
Dries Belsack ◽  
...  

Long coronavirus disease 2019 (COVID-19) was described in patients recovering from COVID-19, with dyspnea being a frequent symptom. Data regarding the potential mechanisms of long COVID remain scarce. We investigated the presence of subclinical cardiac dysfunction, assessed by transthoracic echocardiography (TTE), in recovered COVID-19 patients with or without dyspnea, after exclusion of previous cardiopulmonary diseases. A total of 310 consecutive COVID-19 patients were prospectively included. Of those, 66 patients (mean age 51.3 ± 11.1 years, almost 60% males) without known cardiopulmonary diseases underwent one-year follow-up consisting of clinical evaluation, spirometry, chest computed tomography, and TTE. From there, 23 (34.8%) patients reported dyspnea. Left ventricle (LV) ejection fraction was not significantly different between patients with or without dyspnea (55.7 ± 4.6 versus (vs.) 57.6 ± 4.5, p = 0.131). Patients with dyspnea presented lower LV global longitudinal strain, global constructive work (GCW), and global work index (GWI) compared to asymptomatic patients (−19.9 ± 2.1 vs. −21.3 ± 2.3 p = 0.039; 2183.7 ± 487.9 vs. 2483.1 ± 422.4, p = 0.024; 1960.0 ± 396.2 vs. 2221.1 ± 407.9, p = 0.030). GCW and GWI were inversely and independently associated with dyspnea (p = 0.035, OR 0.998, 95% CI 0.997–1.000; p = 0.040, OR 0.998, 95% CI 0.997–1.000). Persistent dyspnea one-year after COVID-19 was present in more than a third of the recovered patients. GCW and GWI were the only echocardiographic parameters independently associated with symptoms, suggesting a decrease in myocardial performance and subclinical cardiac dysfunction.


2021 ◽  
Vol 23 (Supplement_G) ◽  
Author(s):  
Federico Landra ◽  
Giulia Elena Mandoli ◽  
Benedetta Chiantini ◽  
Maria Barilli ◽  
Giacomo Merello ◽  
...  

Abstract Aims A novel echocardiographic method allows to non-invasively assess myocardial work using pressure–strain loops. Even though left ventricular myocardial work has already emerged as a promising prognostic tool for various pathological conditions, its relationship with invasively-derived corresponding indices has not been assessed in humans yet. This study aimed to explore the correlation between left ventricular myocardial work (LVMW) indices and invasively derived left ventricular stroke work index (LVSWI) in a cohort of patients with advanced heart failure (HF) considered for heart transplantation. Methods and results All consecutive patients with advanced heart failure considered for heart transplantation from 2016 to 2021 that had already performed right heart catheterization (RHC) as part of the workup and with an available echocardiographic exam were included (n = 91). Myocardial work analysis was performed in 44 patients, according to exclusion criteria. Conventional LV functional parameters and LVMW indices, including LV global work index (LVGWI), LV global constructive work (LVGCW), LV global wasted work (LVGWW), LV global work efficiency (LVGWE), and other were calculated and compared with invasively measured LV stroke work index (LVSWI). Median age was 60 years [interquartile range (IQR): 54–63]. Median time between RHC and echocardiography was 0 months (IQR: 0–1). For the most part, etiology of HF was non-ischaemic (61.4%) and all patients were either on class NYHA II (61.4%) or III (27.3%). Median left ventricular ejection fraction was 25% (IQR: 22.3–32.3), median NT-proBNP 1377 pg/ml (IQR: 646–2570). Among conventional parameters of LV function, LVEF did not significantly correlate with LVSWI (r = 0.308; P = 0.050) whereas LV global longitudinal strain (LVGLS) did (r = −0.337; P = 0.031). With regard to LVMW indices, some of them demonstrated correlation with LVSWI, particularly LVGWI (r = 0.425; P = 0.006), LVGCW (r = 0.506; P = 0.001), LV global positive work (LVGPW; r = 0.464; P = 0.003), and LV global systolic constructive work (LVGSCW; r = 0.471; P = 0.002). Conclusions Among left ventricular myocardial work indices, LVGCW correlated better with invasively derived stroke work, thus representing a powerful and reliable tool for a more comprehensive evaluation of myocardial function.


2021 ◽  
Author(s):  
Chanyalew Worku Kassahun ◽  
Addisu Taye Abate ◽  
Zewdu Baye Tezera ◽  
Debrework Tesgera Beshah ◽  
Chilot Desta Agegnehu ◽  
...  

Abstract Background: Safe working environment is a key part, and professional right of nurses. But findings indicated nurses work environment as stressful and complex. The negative effects of a negative nurses’ work environment lead to poor nurse-sensitive patient outcomes, such as increased mortality, pressure ulcers, medication errors, and complications. It has also an effect on their professionalism, practice of patient’s handover. Studies have shown working conditions, professionalism, patient handover and nurse-sensitive patient outcomes are interrelated and form a critical foundation for promoting patients’ and nurses’ safety in hospitals. However, in Ethiopia, there is scarcity of data on this issue. Therefore, the objective of this study was to assess the working environment of nurses in Public Referral Hospitals in Public Referral Hospitals of West Amhara Regional State, Ethiopia, 2021.Methods: An institution based cross-sectional study was conducted among 423 nurses from January to February 2021. Random sampling was used to select nurses from each hospital. Structured, self-administered questionnaires were used to collect the data. EPI- DATA 3.1 was used for data entry and SPSS version-23 software for data analysis. Descriptive statistics were made using statistical measurements. Frequency, percentages, means, and standard deviations were calculated. Practice Environment Scale of the Nursing Work Index tool was used to measure the outcome variable. Binary and multivariable logistic regression analyses were computed to identify associated factors. Finally, texts, tables and graphs were used to report findings. Results: The response rate for the study was 96.2%. One hundred eighty eight (46.2%) nurses perceived that their working environment was conducive, while 219 (53.8 %,) perceived it as not conducive. Nurses who were working in pediatrics wards (AOR= 0.13, 0.02, 0.1) and nurses who gave care for 7-12 patients per day (AOR =0.21, 0.05, 0.98) were less likely to have a conducive working environment, respectively. Nurses who perceived the Ministry of Health to give focus to the nursing profession were 0.27 more likely to have a conducive environment (AOR= 0.27; 0.09, .82).Conclusion and recommendations: More than half of nurses reported that their working environment was not conducive to appropriate practice. Hence, introducing systems to improve participation of nurses in hospital affairs and patient care is essential. It is also important to give attention to nurses who are working at pediatrics wards, and for nurses who give care more than the standards.


2021 ◽  
Vol 17 (5) ◽  
pp. 712-718
Author(s):  
V. E. Oleynikov ◽  
A. V. Babina ◽  
V. A. Galimskaya ◽  
A. V. Golubeva ◽  
K. N. Makarova ◽  
...  

Aim. To study in healthy individuals the gender and age characteristics of left ventricular (LV) myocardial work indicators, their correlations with global LV deformity indicators and echocardiographic parameters characterizing LV systolic and diastolic functions.Materials and methods. 70 Healthy individuals (n=70; 34 men and 36 women; aged 39.3±8.9 years) were included in the study. The echocardiographic examination determined the standard parameters and indicators of myocardial work: global work efficiency (GWE), global constructive work (GCW), global wasted work (GWW), global myocardial work index (GWI); as well as the myocardium deformation characteristics: global longitudinal deformation (GLS), global radial deformation (GRS) and global circular deformation (GCS). Spearman's correlation coefficient was used to investigate the relationship between parameters. A correlation was considered weak at r≤0.3, moderate at 0.3<r<0.7, and strong at r≥0.7.Results. The average value of global work efficiency (GWE) in men was 97% (96; 98), in women – 98% (97; 98). Global constructive work (GCW) in men was 2343.8±350.4 mm Hg%, in women – 2362.2±343.8 mm Hg%. The average value of global wasted work (GWW) in men was 46 mm Hg% (27; 75), in women – 44 mm Hg% (33; 55.5). The global myocardial work index (GWI) in men was 2069.9±356.4 mm Hg%, in women – 2055.7±339.9 mm Hg%. No significant differences were found in the comparative analysis of performance indicators. The analysis of correlations found that the myocardial work indicators didn't have significant correlations with age. Ejection fraction was moderately correlated with GWI (r=0.45) and GCW (r=0.49). Global longitudinal strain was strongly correlated with GWI (r=0.77) and GCW (r=0.77). Global radial strain correlated moderately directly with GWI (r=0.4) and GCW (r=0.4). Global circular strain was moderately correlated with GCW (r=0.35). A strong negative correlation was found between the GWE indicator and the post systolic contraction index (PSI) (r=-0.85). At the same time, PSI and GWW had a strong positive correlation (r=0.85).Conclusion. Indicators of LV myocardial work in healthy individuals do not have gender differences. The efficiency of the work of the myocardium depends primarily on the deformation of the LV, while the constructive work is determined by the volume characteristics. The wasted work indicator depends on the number of segments that peak in the post-systolic period.


Author(s):  
Pengge Li ◽  
Yonggao Zhang ◽  
Lijin Li ◽  
Mengjiao Sun ◽  
Zhen Li ◽  
...  

Objective: The present study aimed to investigate the difference in left ventricular (LV) global and regional myocardial (MW) of strength athletes with different heart rates (HR) through non-invasive LV pressure-strain loop (PSL) and further address the effect of athlete’s heart rate variability on the LV systolic function. Methods: Fifty young professional wrestlers were collected randomly and divided into two groups in accordance with their different HR: the low HR (45~60 bpm, n=25) and the high HR (60~80 bpm, n=25). Thirty individuals with gender- and age-matched healthy volunteers served as controls ( n=30). Global and regional MW parameters were evaluated using LV-PSL derived from speckle tracking echocardiography (STE) and brachial artery pressure, and then compared between the above three groups. Results: The indicators of global and regional MW did statistically significantly differ between the athlete and control groups. Peak strain dispersion (PSD) and global myocardial wasted work (GWW) increased while global myocardial work efficiency (GWE) reduced in LHR and HHR groups compared with the control group, and global myocardial work index (GWI), global myocardial constructive work (GCW), global longitudinal strain (GLS) decreased in LHR group ( P<0.05). In comparison to the LHR group, GWI, GCW, GWW, PSD increased in HHR group and GWE reduced ( P<0.05). According to the regional MW analysis, the mean regional myocardial work index (RMWI) increasing gradually from basal to apical levels were similar across the three groups and regional myocardial work efficiency (RMWE) did not. Multiple linear regression analysis indicated that the HR, posterior wall thickness (PWT), interventricular septal thickness (IVST), GLS, and PSD were correlated with GWE ( b’= -0.247, -0.390, -0.370, 0.340, and -0.554, respectively, P<0.05). Conclusions: The LV contractile performance was more impaired in young strength athletes with high heart rates and PSL can be used to assess LV GMW and RMW quantitatively and accurately in reflecting LV systolic function.


2021 ◽  
Vol 40 (3) ◽  
pp. 387-392
Author(s):  
D.M. Bwala ◽  
F. Abdulfattah ◽  
O.O. Alabi ◽  
B.O. Adewuyi

This report shows the work index of Filin Kokuwa Gold ore sample in Bauchi State, Nigeria. The “reference sample (granites)” were sourced from outcrops of granites around Toro town. The samples were crushed, ground, and pulverized using appropriate laboratory milling machine. 80% passing size for the gold ore and granites samples were obtained at 100μm sieve size for the ball mill feeds and products respectively. The work indexes of reference samples i.e. granites were used to calculate the work index of the Filin Kokuwa gold ore sample. The values of 13.277kWh/ton and 15.192kWh/ton were obtained respectively for the two different reference granites samples used and 14.21kWh/ton as their average which is the value of the work index of the Filin Kokuwa gold ore deposit. The energy required for grinding the ore was found to be 3.581kW.


Author(s):  
Y. E. Gbadamosi ◽  
O. O. Alabi ◽  
J. O. Borode

The Bond standard grindability test provides a Work Index that is widely used to estimate the energy required for ore grinding. The research investigates the work index of Anka Manganese ore at Anka deposit in Zamfara state, Nigeria. The reference ore (Quartz) was sourced from the studied ore overburden in the mine. The test ore and the reference ore were characterized using Energy Dispersive X-ray fluorescence spectrometer, X - ray Diffractometer and the Scanning Electron Microscope equipped with Energy Dispersive Spectrum. 500 g each of the manganese ore and quartz were sampled and prepared by crushing and grinding to 100% passing 1200 μm sieve. 100 g of prepared ores were charged into array of sieve arranged in √2 series from 1000 μm to 63 μm. Set of sieves were mounted on the Automated Pascal Denver sieve shaker (16153) and was in operation for 20 minutes. The work index of reference ore was used to calculate the work index of the test ore using Gaudin Schuman expression to obtain a work index of 14.16 Kwh/ton for test ore and it lies within the work index of 10-15.14 Kwh/ton for manganese ore stated in the literature and the energy expended to achieve communition at mineral liberation size was calculated to be 3.3984 Kw/ton.


Sign in / Sign up

Export Citation Format

Share Document