scholarly journals Balloon-based measuring system for compliance investigations

2018 ◽  
Vol 4 (1) ◽  
pp. 539-542
Author(s):  
Wolfram Schmidt ◽  
Carsten Tautorat ◽  
Kerstin Schümann ◽  
Peter Behrens ◽  
Niels Grabow ◽  
...  
Keyword(s):  
Balloon Catheter ◽  
Measuring System ◽  
Lumen Area ◽  
Cross Sectional ◽  
Technical Limitation ◽  
Elastic Tubes ◽  
Starting Point ◽  
Volume Relationship ◽  
Pressure Volume Relationship ◽  
Working Principle

AbstractFor the development of new stent designs, the compliance of the surrounding biological tissue has to be considered. We expect to obtain parameters for simulation, stent dimensioning, and the forces acting on the stent after implantation. Starting point of the investigations is the commercially available Metricath system allowing cross-sectional lumen area measurements of arteries. Its working principle is based on the pressure-volume relationship using a balloon catheter, which is inflated to a specific pressure of about 250 mmHg and conforms to the shape and size of the lumen. However, for compliance charts multiple pressure levels and a larger pressure range are needed. To overcome this technical limitation, the Metricath balloon catheter is combined with a new inflation device, called pV-Monitor. The presented cross-sectional lumen area measurements in rigid tubes and compliance investigations of elastic tubes demonstrate the feasibility of the pV-Monitor system.

TO EVALUATE THE EFFECTIVENESS OF CONDOM BALLOON CATHETER IN TREATING INTRACTABLE POSTPARTUM HEMORRHAGE AT KONTUM PROVINCIAL HOSPITAL

2018 ◽  
Vol 8 (6) ◽  
pp. 178-183
Author(s):  
Dinh Nguyen Gia ◽  
Thanh Cao Ngoc
Keyword(s):  
Maternal Death ◽  
Postpartum Hemorrhage ◽  
Medical Management ◽  
Balloon Catheter ◽  
Uterine Atony ◽  
Cross Sectional ◽  
Common Cause ◽  
Provincial Hospital ◽  
Balloon Tamponade ◽  
Condom Catheter

Background: Postpartum hemorrhage (PPH) remains a significant contributor to maternal morbility and mortality and accounts for 31% of maternal death in Vietnam. The most common cause of PPH is uterine atony. Recently, uterine tamponade using intrauterine condom appears to be an effective tool in the management of intractable PPH. Objectives: To evaluate the success of condom as a tamponade to arrest intractable PPH due to uterine atony in patients not responding to medical management. Materials and Methods: The study was designed as a cross-sectional and descriptive, included 32 patients who underwent condom balloon tamponade at Kontum Provincial Hospital from 1/2012 to 8/2016. Results: 32 women (mean age 25.71 ± 6.45 years range, 16 - 39) underwent condom balloon tamponade for PPH controls. 29 patients (90.62%) successfully responded the tamponade therapy by the use of condom catheter. Three patients (9.37%) required hysterectomy. Conclusions: Condom catheter balloon effectively controls the intractable PPH due to uterine atony. Key words: PPH (Pospartum hemorrhage), Tamponade, Condom catheter balloon, Uterine atony

scholarly journals Examining Australian public perceptions and behaviors towards a future COVID-19 vaccine

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Holly Seale ◽  
Anita E. Heywood ◽  
Julie Leask ◽  
Meru Sheel ◽  
David N. Durrheim ◽  
...  
Keyword(s):  
Online Survey ◽  
Private Health Insurance ◽  
Public Perceptions ◽  
Multivariable Logistic Regression Model ◽  
Careful Planning ◽  
Cross Sectional ◽  
The Public ◽  
Individual Perceptions ◽  
Starting Point ◽  
Early Indication

Abstract Background As immunisation program launches have previously demonstrated, it is essential that careful planning occurs now to ensure the readiness of the public for a COVID-19 vaccine. As part of that process, this study aimed to understand the public perceptions regarding a future COVID-19 vaccine in Australia. Methods A national cross-sectional online survey of 1420 Australian adults (18 years and older) was undertaken between 18 and 24 March 2020. The statistical analysis of the data included univariate and multivariable logistic regression model analysis. Results Respondents generally held positive views towards vaccination. Eighty percent (n = 1143) agreed with the statement that getting myself vaccinated for COVID-19 would be a good way to protect myself against infection. Females (n = 614, 83%) were more likely to agree with the statement than males (n = 529, 78%) (aOR = 1.4 (95% CI: 1.1–1.8); P = 0.03), while 91% of those aged 70 years and above agreed compared to 76% of 18–29-year-olds (aOR = 2.3 (95% CI:1.2–4.1); P = 0.008). Agreement was also higher for those with a self-reported chronic disease (aOR = 1.4 (95% CI: 1.1–2.0); P = 0.04) and among those who held private health insurance (aOR = 1.7 (95% CI: 1.3–2.3); P < 0.001). Beyond individual perceptions, 78% stated that their decision to vaccinate would be supported by family and friends. Conclusion This study presents an early indication of public perceptions towards a future COVID-19 vaccine and represents a starting point for mapping vaccine perceptions. To support an effective launch of these new vaccines, governments need to use this time to understand the communities concerns and to identify the strategies that will support engagement.

Area beneath the end-systolic pressure-volume relationship as an index of inotropicstate in intact dogs

1986 ◽  
Vol 18 ◽  
pp. 20-20 ◽  
Author(s):  
A CROTTOGINI ◽  
J BARRA ◽  
M RODRIGUEZCHATRUC ◽  
R ARMENTANO ◽  
E CABRERA ◽  
...  
Keyword(s):  
Systolic Pressure ◽  
Volume Relationship ◽  
Pressure Volume Relationship

A modified tangent-gas approximation for two-dimensional steady flow

1958 ◽  
Vol 4 (6) ◽  
pp. 600-606 ◽  
Author(s):  
G. Power ◽  
P. Smith
Keyword(s):  
Least Squares ◽  
Steady Flow ◽  
Variational Approach ◽  
Least Squares Method ◽  
Two Dimensional ◽  
Subsonic Flows ◽  
Von Karman ◽  
Straight Line ◽  
Volume Relationship ◽  
Pressure Volume Relationship

A set of two-dimensional subsonic flows past certain cylinders is obtained using hodograph methods, in which the true pressure-volume relationship is replaced by various straight-line approximations. It is found that the approximation obtained by a least-squares method possibly gives best results. Comparison is made with values obtained by using the von Kármán-Tsien approximation and also with results obtained by the variational approach of Lush & Cherry (1956).

The emergence of entrepreneurial team as a research field – way forward

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Willy Das ◽  
Satyasiba Das ◽  
Manojit Chattopadhyay
Keyword(s):  
Research Agenda ◽  
Research Field ◽  
Academic Disciplines ◽  
Future Research ◽  
Cross Sectional ◽  
Content Type ◽  
Future Research Agenda ◽  
Starting Point ◽  
Entrepreneurial Team ◽  
Research Stream

PurposeThe purpose of this paper is to review and critique the existing literature on entrepreneurial teams (ET) by taking a multi-disciplinary viewpoint and provide a future research agenda based on the identified themes and trends.Design/methodology/approachA systematic literature review (SLR) was undertaken using “business source complete”. Further scrutiny and application of exclusion criteria led to a final sample consisting of 139 papers from 27 different journals belonging to not just entrepreneurship and strategic management but also other disciplines like OB, finance, sociology, psychology, etc. Using qualitative thematic analysis, the authors identified 11 major themes.FindingsThe paper reviews both the eleven themes and the linkages between the themes. Thereby identifying areas that have been understudied and those that have received comparatively more attention. The review revealed that the research stream possesses certain conceptual and methodological concerns apart from its cross-sectional and primarily bivariate nature. Five such main concerns have been identified and discussed in detail. Other elements of the resulting research agenda include calls for more clinical process-oriented research, further attention to context, shifting the level of analysis, and a need to integrate across disciplines.Originality/valueThis paper incorporates a broad insight of ET across academic disciplines to show how future contributions could benefit by incorporating research from other fields. In doing so, provides a starting point for more nuanced discussions around the interrelationships between the different conversations that are taking place in the ET literature.

scholarly journals Viscoelasticity of the trachea and its effects on flow limitation

2006 ◽  
Vol 100 (2) ◽  
pp. 384-389 ◽  
Author(s):  
Nikolai Aljuri ◽  
Jose G. Venegas ◽  
Lutz Freitag
Keyword(s):  
Wave Speed ◽  
Mathematical Representation ◽  
Forced Expiration ◽  
Flow Limitation ◽  
Time Dependency ◽  
Cross Sectional ◽  
Elastic Tubes ◽  
Forced Expiratory Flow ◽  
Expiratory Flow ◽  
The Relationship

To test the hypothesis that peak expiratory flow is determined by the wave-speed-limiting mechanism, we studied the time dependency of the trachea and its effects on flow limitation. For this purpose, we assessed the relationship between transmural pressure and cross-sectional area [the tube law (TL)] of six excised human tracheae under controlled conditions of static (no flow) and forced expiratory flow. We found that TLs of isolated human tracheae followed quite well the mathematical representation proposed by Shapiro (Shapiro AH. J Biomech Eng 99: 126–147, 1977) for elastic tubes. Furthermore, we found that the TL measured at the onset of forced expiratory flow was significantly stiffer than the static TL. As a result, the stiffer TL measured at the onset of forced expiratory flow predicted theoretical maximal expiratory flows far greater than those predicted by the more compliant static TL, which in all cases studied failed to explain peak expiratory flows measured at the onset of forced expiration. We conclude that the observed viscoelasticity of the tracheal walls can account for the measured differences between maximal and “supramaximal” expiratory flows seen at the onset of forced expiration.

Preliminary design of precast, segmental box-girder bridges using optimization

1979 ◽  
Vol 6 (1) ◽  
pp. 120-128
Author(s):  
Craig J. Miller ◽  
Juarez Accioly
Keyword(s):  
Minimum Cost ◽  
Preliminary Design ◽  
Box Girder Bridges ◽  
Cross Sectional ◽  
Box Girder ◽  
Prestressing Steel ◽  
Girder Bridges ◽  
Starting Point ◽  
Final Design ◽  
The Cost

Precast, prestressed segmental box-girder bridges are now accepted as an economical alternative for spans over 150 ft (46 m). Decisions about cross-sectional dimensions made during preliminary design can have a substantial influence on the final cost of the bridge. To help the designer obtain an economical starting point for a final design, a program was written to determine section dimensions and midspan and pier prestressing steel areas to give minimum cost. Since a preliminary design is obtained, the analysis techniques and design criteria have been simplified to reduce computation. The design produced by the program will satisfy AASHTO specification requirements and the recommendations of the PCI Bridge Committee. The optimization algorithm used is the generalized reduced gradient technique. To demonstrate the program capabilities, three example problems are discussed. The results indicate that optimum span-depth ratios are approximately 24 for the cost ratios used. The cost of the optimum design does not seem to be too sensitive to the ratio of concrete cost to prestressing steel cost.

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