scholarly journals Numerical investigation of the impact of warming blankets on the performance of ventilation systems in the operating room

2021 ◽  
pp. 1-23
Author(s):  
Parastoo Sadeghian ◽  
Christophe Duwig ◽  
Olof Sköldenberg ◽  
Ann Tammelin ◽  
Ardalan Rahimi Hosseini ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Operating Room ◽  
The Impact ◽  
Ventilation Systems

Impact of Hybrid Operating Rooms on Long-Term Clinical Outcomes Following Fenestrated and Branched Endovascular Aortic Repair

2021 ◽  
pp. 152660282199672
Author(s):  
Giovanni Tinelli ◽  
Marie Bonnet ◽  
Adrien Hertault ◽  
Simona Sica ◽  
Gian Luca Di Tanna ◽  
...  
Keyword(s):  
Operating Room ◽  
Clinical Outcomes ◽  
Cox Regression ◽  
Statistical Significance ◽  
Aortic Aneurysms ◽  
Study Patient ◽  
Cox Regression Analysis ◽  
Significant Difference ◽  
The Impact

Purpose: Evaluate the impact of hybrid operating room (HOR) guidance on the long-term clinical outcomes following fenestrated and branched endovascular repair (F-BEVAR) for complex aortic aneurysms. Materials and Methods: Prospectively collected registry data were retrospectively analyzed to compare the procedural, short- and long-term outcomes of consecutive F-BEVAR performed from January 2010 to December 2014 under standard mobile C-arm versus hybrid room guidance in a high-volume aortic center. Results: A total of 262 consecutive patients, including 133 patients treated with a mobile C-arm equipped operating room and 129 with a HOR guidance, were enrolled in this study. Patient radiation exposure and contrast media volume were significantly reduced in the HOR group. Short-term clinical outcomes were improved despite higher case complexity in the HOR group, with no statistical significance. At a median follow-up of 63.3 months (Q1 33.4, Q3 75.9) in the C-arm group, and 44.9 months (Q1 25.1, Q3 53.5, p=0.53) in the HOR group, there was no statistically significant difference in terms of target vessel occlusion and limb occlusion. When the endograft involved 3 or more fenestrations and/or branches (complex F-BEVAR), graft instability (36% vs 25%, p=0.035), reintervention on target vessels (20% vs 11%, p=0.019) and total reintervention rates (24% vs 15%, p=0.032) were significantly reduced in the HOR group. The multivariable Cox regression analysis did not show statistically significant differences for long-term death and aortic-related death between the 2 groups. Conclusion: Our study suggests that better long-term clinical outcomes could be observed when performing complex F-BEVAR in the latest generation HOR.

Numerical Investigation of the Solidity Effect on Linear Compressor Cascades

2014 ◽  
Author(s):  
J. Sans ◽  
M. Resmini ◽  
J.-F. Brouckaert ◽  
S. Hiernaux
Keyword(s):  
Numerical Investigation ◽  
State Of The Art ◽  
Leading Edge ◽  
Operating Conditions ◽  
Compressor Cascade ◽  
Minimum Loss ◽  
Low Speed ◽  
High Mach ◽  
The Stability ◽  
The Impact

Solidity in compressors is defined as the ratio of the aerodynamic chord over the peripheral distance between two adjacent blades, the pitch. This parameter is simply the inverse of the pitch-to-chord ratio generally used in turbines. Solidity must be selected at the earliest design phase, i.e. at the level of the meridional design and represents a crucial step in the whole design process. Most of the existing studies on this topic rely on low-speed compressor cascade correlations from Carter or Lieblein. The aim of this work is to update those correlations for state-of-the-art controlled diffusion blades, and extend their application to high Mach number flow regimes more typical of modern compressors. Another objective is also to improve the physical understanding of the solidity effect on compressor performance and stability. A numerical investigation has been performed using the commercial software FINE/Turbo. Two different blade profiles were selected and investigated in the compressible flow regime as an extension to the low-speed data on which the correlations are based. The first cascade uses a standard double circular arc profile, extensively referenced in the literature, while the second configuration uses a state-of-the-art CDB, representative of low pressure compressor stator mid-span profile. Both profiles have been designed with the same inlet and outlet metal angles and the same maximum thickness but the camber and thickness distributions, the stagger angle and the leading edge geometry of the CDB have been optimized. The determination of minimum loss, optimum incidence and deviation is addressed and compared with existing correlations for both configurations and various Mach numbers that have been selected in order to match typical booster stall and choke operating conditions. The emphasis is set on the minimum loss performance at mid-span. The impact of the solidity on the operating range and the stability of the cascade are also studied.

Introducing new technology into the operating room: Measuring the impact on job performance and satisfaction

Surgery ◽  
2005 ◽  
Vol 137 (5) ◽  
pp. 518-526 ◽  
Author(s):  
James E. Stahl ◽  
Marie T. Egan ◽  
Julian M. Goldman ◽  
Dawn Tenney ◽  
Richard A. Wiklund ◽  
...  
Keyword(s):  
Job Performance ◽  
Operating Room ◽  
New Technology ◽  
Job Performance And Satisfaction ◽  
The Impact

Blood, Sweat, Toil, and Tears of Surgical Training. Part I: Blood

2007 ◽  
Vol 15 (4) ◽  
pp. 307-309 ◽  
Author(s):  
Andrew J Drain ◽  
Jonathon I Ferguson ◽  
Sharon Wilkinson ◽  
Samer AM Nashef
Keyword(s):  
Adverse Effect ◽  
Blood Loss ◽  
Operating Room ◽  
Clinical Outcomes ◽  
Surgical Training ◽  
Clinical Service ◽  
Significant Difference ◽  
Potential Impact ◽  
The Impact ◽  
Cardiac Operations

There may be conflict between the requirements of surgical training and those of the clinical service if training has an impact on clinical outcomes. One area of potential impact is perioperative blood loss. We compared total and 12-hour blood loss after 2,079 consecutive cardiac operations performed over 2 years by trainees and consultants. One- and two-way analyses of variance with EuroSCORE and surgeon status as factors were carried out to evaluate the impact of surgeon status on blood loss. There was no difference in blood loss between consultants and trainees. We also compared the rates between consultants and trainees of patients returning to the operating room due to bleeding. This showed a significant difference, with trainees having a higher rate of investigation for bleeding. Cardiac surgical training can be achieved without an adverse effect on blood loss, but it may be associated with a higher rate of re-intervention for bleeding.

Problem Diagnosis and Aerodynamic Improvement of a Field Pipeline Compressor

2000 ◽  
Author(s):  
Zheji Liu ◽  
D. Lee Hill ◽  
Yuri I. Biba
Keyword(s):  
Numerical Investigation ◽  
Individual Component ◽  
Field Testing ◽  
Interface Model ◽  
Efficiency Improvement ◽  
Extensive Investigation ◽  
Peak Efficiency ◽  
Aerodynamic Loss ◽  
Design Changes ◽  
The Impact

Abstract An extensive investigation surrounding a performance shortfall of a pipeline compressor is presented. Regions of high aerodynamic loss are identified from an extensive flange-to-flange numerical investigation. Special attention is placed on understanding the impact of the interface model between the rotating and stationary components on the performance of each individual component and the whole machine. This process lead to the redesign of the radial inlet, the diffuser region, and the volute. Upon numerical validation of the proposed design changes, the components were manufactured and installed into the compressor that was already operating in the field. “Field” testing showed the new design to have a peak efficiency improvement of 4 points surpassing the contract guarantee.

scholarly journals The impact of seasonal operating room closures on wait times for oral cancer surgery

2018 ◽  
Vol 25 (1) ◽  
pp. 67 ◽  
Author(s):  
N. Mundi ◽  
J. Theurer ◽  
A. Warner ◽  
J. Yoo ◽  
K. Fung ◽  
...  
Keyword(s):  
Oral Cavity ◽  
Cancer Patients ◽  
Operating Room ◽  
Oral Cavity Cancer ◽  
Tertiary Care ◽  
Wait Time ◽  
Disease Recurrence ◽  
Health Science ◽  
Wait Times ◽  
The Impact

Background Operating room slowdowns occur at specific intervals in the year as a cost-saving measure. We aim to investigate the impact of these slowdowns on the care of oral cavity cancer patients at a Canadian tertiary care centre.Methods A total of 585 oral cavity cancer patients seen between 1999 and 2015 at the London Health Science Centre (lhsc) Head and Neck Multidisciplinary Clinic were included in this study. Operating room hours and patient load from 2006 to 2014 were calculated. Our primary endpoint was the wait time from consultation to definitive surgery. Exposure variables were defined according to wait time intervals occurring during time periods with reduced operating room hours.Results Overall case volume rose significantly from 2006 to 2014 (p < 0.001), while operating room hours remained stable (p = 0.555). Patient wait times for surgery increased from 16.3 days prior to 2003 to 25.5 days in 2015 (p = 0.008). Significant variability in operating room hours was observed by month, with lowest reported for July and August (p = 0.002). The greater the exposure to these months, the more likely patients were to wait longer than 28 days for surgery (odds ratio per day [or]: 1.07, 95% confidence interval [ci]: 1.05 to 1.10, p < 0.001). Individuals seen in consultation preceding a month with below average operating room hours had a higher risk of disease recurrence and/or death (hazard ratio [hr]: 1.59, 95% ci: 1.10 to 2.30, p = 0.014).Conclusions Scheduled reductions in available operating room hours contribute to prolonged wait times and higher disease recurrence. Further work is needed to identify strategies maximizing efficient use of health care resources without negatively affecting patient outcomes.

scholarly journals Numerical investigation of the fatal 1985 Manchester Airport B737 fire

2017 ◽  
Vol 121 (1237) ◽  
pp. 287-319 ◽  
Author(s):  
E. R. Galea ◽  
Z. Wang ◽  
F. Jia
Keyword(s):  
Wind Speed ◽  
Numerical Investigation ◽  
Computer Simulations ◽  
Potential Benefit ◽  
Fire Plume ◽  
Significant Difference ◽  
Actual Fire ◽  
The Right ◽  
The Impact ◽  
Burn Through

ABSTRACTIn this paper, fire and evacuation computer simulations are used to reconstruct the 1985 Manchester Airport B737 fire that resulted in the loss of 55 lives. First the actual fire and evacuation are reconstructed. Secondly, the impact of exit opening times and external wind on the fire and evacuation are investigated. Finally, the potential benefit offered by modern materials is evaluated. The results suggest that the number of fatalities could have been reduced by 87% had the forward right exit not malfunctioned and by 36% had the right over-wing exit been opened without delay. Furthermore, given the fuel pool size and location, a critical wind speed of 1.5m/s is necessary to cause the fire plume to lean onto the fuselage eventually resulting in fuselage burn-through. Finally, it is suggested that the use of modern cabin materials could have made a significant difference to the fire development and survivability.

Numerical Investigation of a Stiffened Panel Subjected to Low Velocity Impacts

2015 ◽  
Vol 665 ◽  
pp. 277-280 ◽  
Author(s):  
Aniello Riccio ◽  
S. Saputo ◽  
A. Sellitto ◽  
A. Raimondo ◽  
R. Ricchiuto
Keyword(s):  
Numerical Investigation ◽  
Composite Laminates ◽  
Mechanical Response ◽  
Numerical Study ◽  
Fem Analysis ◽  
Matrix Cracking ◽  
Stiffened Panel ◽  
Low Velocity ◽  
Formation And Evolution ◽  
The Impact

The investigation of fiber-reinforced composite laminates mechanical response under impact loads can be very difficult due to simultaneous failure phenomena. Indeed, as a consequence of low velocity impacts, intra-laminar damage as fiber and matrix cracking and inter-laminar damage, such as delamination, often take place concurrently, leading to significant reductions in terms of strength and stability for composite structure. In this paper a numerical study is proposed which, by means of non-linear explicit FEM analysis, aims to completely characterize the composite reinforced laminates damage under low velocity impacts. The numerical investigation allowed to obtain an exhaustive insight on the different phases of the impact event considering the damage formation and evolution. Five different impact locations with the same impact energy are taken into account to investigate the influence on the onset and growth of damage.

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