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Search Results: 1 - 10 of 53061 matches for " David Faraoni "
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“Your Guide to Paediactric Anesthesia” by Sims and Johnson: A Book Review  [PDF]
David Faraoni
Open Journal of Anesthesiology (OJAnes) , 2012, DOI: 10.4236/ojanes.2012.21003
Abstract: “Your Guide to Paediatric Anaesthesia”by Sims and Johnson is the first edition of a book written for fellow or non-pediatric anesthetists. The authors give a practical approach for daily practice in pediatric anesthesia. This \"book review\" describes a general presentation and an objective evaluation of this recently published book.
Anesthesia Management in Case of Carotid Anatomic Variant during Carotid Endarterectomy under General Anesthesia  [PDF]
David Faraoni, Benjamin Mine, Giulia Apicella, Alexandre Joosten
Open Journal of Anesthesiology (OJAnes) , 2012, DOI: 10.4236/ojanes.2012.22005
Abstract: Carotid endarterectomy is an established treatment in the prevention of transient ischemic attack or stroke. Cerebral embolism, thrombosis or hypo-perfusion will lead to a major risk of perioperative thrombotic events. In this case, we report an interesting anesthesia approach for aortic arch anatomic variant management and monitoring.
Correlation Between Activated Clotting Time and Activated Partial Thromboplastin Time During Endovascular Treatment of Cerebral Aneurysms  [PDF]
David Faraoni, Benjamin Mine, Wael Nabhan, Pierre Nokerman, Yvon Deryck, Michel Baurain, Boris Lubicz
Open Journal of Anesthesiology (OJAnes) , 2012, DOI: 10.4236/ojanes.2012.21001
Abstract: Purpose: Endovascular treatment (EVT) of intracranial aneurysms (IA) requires a continuous anticoagulation to avoid thromboembolic complications. In order to monitor the anticoagulation, different tests may be used including the activated clotting time (ACT) and the activated partial thromboplastin time (APTT). The aim of this study was to compare ACT and APTT for the monitoring of the anticoagulation during EVT of IA. Methods: Patients referred for EVT of an IA were included. After induction, baseline ACT and APTT were recorded, followed by a bolus infusion of unfractionated heparin (50 UI.kg–1). The same tests were controlled five minutes later with the purpose of doubling the baseline ACT value. Correlation and agreement between both tests were evaluated for the percentage of change after the bolus. Multiple linear regressions were also calculated in order to show confounding factors. Complications and outcomes were also recorded. Results: 45 patients were checked for enrolment and 24 were included for analysis. Mean (SD) % variation for APTT was 432.1 (75.7) and 60.6 (23.0) for ACT with p < 0.0001. With the Bland-Altman method, value of Bias (SD) is 372 (86) with 95% limits of agreement range from 203 to 540. Pearson correlation for % variation shows r (95% CI) = –0.23 (–0.58 to 0.19) with p = 0.29 and R square = 0.05. 100% of the APTT values could be defined as excessive anticoagulation by opposition of the 8% obtained with ACT. Conclusions: This prospective observational study shows that ACT test is not well correlated with APTT and leads to a systematic excessive coagulation during EVT of IA.
Black Hole Entropy in Scalar-Tensor and ?(R) Gravity: An Overview
Valerio Faraoni
Entropy , 2010, DOI: 10.3390/e12051246
Abstract: A short overview of black hole entropy in alternative gravitational theories is presented. Motivated by the recent attempts to explain the cosmic acceleration without dark energy, we focus on metric and Palatini ?(R) gravity and on scalar-tensor theories.
Conformally Coupled Inflation
Valerio Faraoni
Galaxies , 2013, DOI: 10.3390/galaxies1020096
Abstract: A massive scalar field in a curved spacetime can propagate along the light cone, a causal pathology, which can, in principle, be eliminated only if the scalar couples conformally to the Ricci curvature of spacetime. This property mandates conformal coupling for the field driving inflation in the early universe. During slow-roll inflation, this coupling can cause super-acceleration and, as a signature, a blue spectrum of primordial gravitational waves.
Evolving Black Hole Horizons in General Relativity and Alternative Gravity
Valerio Faraoni
Galaxies , 2013, DOI: 10.3390/galaxies1030114
Abstract: From the microscopic point of view, realistic black holes are time-dependent and the teleological concept of the event horizon fails. At present, the apparent or trapping horizon seem to be its best replacements in various areas of black hole physics. We discuss the known phenomenology of apparent and trapping horizons for analytical solutions of General Relativity and alternative theories of gravity. These specific examples (we focus on spherically symmetric inhomogeneities in a background cosmological spacetime) are useful as toy models for research on various aspects of black hole physics.
Harrison's interpretation of the cosmological redshift revisited
Valerio Faraoni
Physics , 2009, DOI: 10.1007/s10714-009-0885-8
Abstract: Harrison's argument against the interpretation of the cosmological redshift as a Doppler effect is revisited, exaggerated, and discussed. The context, purpose, and limitations of the interpretations of this phenomenon are clarified.
Nonstationary Gravitational Lenses and the Fermat Principle
Valerio Faraoni
Physics , 1992, DOI: 10.1086/171866
Abstract: We apply Perlick's (1990a) rigorous formulation of the Fermat principle in arbitrary spacetimes to prove the correctness of the description of gravitational lensing by gravitational waves, given in the literature using the scalar and vector formalisms. We obtain an expression for the time delay due to such nonstationary lenses; the advantage over previous papers is that Perlick's formulation of the Fermat principle is very rigorous and more suitable for practical calculations in some cases. It is also shown that ordinary moving gravitational lenses must be considered as a stationary case.
The creation of multiple images by a gravitational wave
Valerio Faraoni
Physics , 1996,
Abstract: We describe gravitational lensing by a gravitational wave, in the regime in which multiple images of a light source are created. We adapt the vector formalism employed for ordinary gravitational lenses to the case of a non-stationary spacetime, and we derive an approximate condition for multiple imaging. It is shown that certain astrophysical sources of gravitational waves satisfy this condition.
An analysis of the Sultana-Dyer cosmological black hole solution of the Einstein equations
Valerio Faraoni
Physics , 2009, DOI: 10.1103/PhysRevD.80.044013
Abstract: The Sultana-Dyer solution of general relativity representing a black hole embedded in a special cosmological background is analysed. We find an expanding (weak) spacetime singularity instead of the reported conformal Killing horizon, which is covered by an expanding black hole apparent horizon (internal to a cosmological apparent horizon) for most of the history of the universe. This singularity was naked early on. The global structure of the solution is studied as well.
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