1,161 research outputs found
Pediatric Stroke Presenting as a Seizure.
Background. Childhood arterial ischemic stroke (AIS) is rare and may be difficult to diagnose. Management of acute stroke in any age group is time sensitive, so awareness of the manifestations and appropriate diagnostic procedures for pediatric AIS is vital to establishing care. We present a pediatric case of arterial ischemic stroke that presented to the emergency department (ED) after two seizures. Case Report. A five-year-old female with an existing seizure disorder presented to a pediatric ED after having two seizures. Postictal upon arrival, she underwent a computed tomography (CT) scan of her head. Family reported that she had complained of a severe headache and vomited; her seizures were described as different from those she had experienced in the past. Loss of grey white matter differentiation on the CT warranted magnetic resonance imaging (MRI), which demonstrated a right-sided stroke. After a complicated course in the hospital, the patient was discharged to a rehabilitation hospital. Why Should an Emergency Physician Be Aware of This? It is important that emergency physicians recognize that a seizure may be the initial symptom of a pediatric stroke regardless of an established seizure history. Pediatric seizures are relatively common; however consideration of the diagnosis of pediatric stroke may prevent unnecessary delays in treatment
Les Cyanophyceae marines de lâĂźle de Ngor (SĂ©nĂ©gal)
La prĂ©sente Ă©tude a Ă©tĂ© initiĂ©e dans le but de dĂ©terminer la composition taxonomique et la structure des peuplements de Cyanophyceae au niveau de lâile de Ngor. Durant les travaux, une description basĂ©e sur des caractĂšres morphologiques du thalle (cellule, colonie ou filament) des taxa a Ă©tĂ© effectuĂ©e. Aussi une classification et un inventaire systĂ©matique de ces taxa ont Ă©tĂ© rĂ©alisĂ©s. Six prĂ©lĂšvements ont Ă©tĂ© effectuĂ©s entre juillet 2009 et aoĂ»t 2010 dans les eaux marines de lâĂźle de Ngor situĂ©e Ă 800 m de la cĂŽte dakaroise (SĂ©nĂ©gal). Lâobservation des diffĂ©rents Ă©chantillons prĂ©levĂ©s a permis de rĂ©pertorier au niveau de cet Ă©cosystĂšme 38 taxa de Cyanophyceae dont 28 identifiĂ©es jusquâau niveau spĂ©cifique, rĂ©parties en 18 genres et 11 familles. Sur ces 11 familles, seules trois dâentre elles regroupent plus de la moitiĂ© des taxa prĂ©sents. Ce sont les Oscillatoriaceae avec 31,56%, les Phormidiaceae et les Pseudanabaenaceae avec chacune 15,79%. Les Merismopediaceae reprĂ©sentent 10,53% des taxa, les Chroococcaceae 7,89%, et les Synechococcaceae 5,26%. Les familles des Borziaceae, des Xenococcaceae, des Hyellaceae, des Microcystaceae et des Rivulariaceae ne reprĂ©sentent chacune que 2,63%. Pour ce qui est des genres, Oscillatoria Vaucher est le plus reprĂ©sentĂ© avec 7 taxa, suivi des genres Lyngbya C. Agardh et Phormidium KĂŒtz. Ex Gom. avec chacun 4 taxa. Sur les 28 taxa identifiĂ©s jusquâau niveau espĂšce, 17 ont Ă©tĂ© dĂ©crits pour la 1ere fois au SĂ©nĂ©gal.Mots-clĂ©s : Cyanophyceae, composition taxonomique, structure, Ăźle de Ngor, SĂ©nĂ©ga
The ââICEââ Study: Feasibility of Inexpensive Commercial Coolers on Mobile EMS Units
Introduction: Prehospital postresuscitation induced hypothermia (IH) has been shown to reduce neurological complications in comatose cardiac-arrest survivors. Retrofitting ambulances to include equipment appropriate to initiate hypothermia, such as refrigeration units for cooled saline, is expensive. The objective of this nonhuman subject research study was to determine if inexpensive, commercially available coolers could, in conjunction with five reusable ice packs, keep two 1 L bags of precooled 0.9% normal saline solution (NSS) at or below 48C for an average shift of eight to 12 hours in a real-world environment, on board in-service Emergency Medical Service (EMS) units, over varying weather conditions in all seasons. Methods: The coolers were chosen based on availability and affordability from two nationally available brands: The Igloo MaxxCold (Igloo Products Corp., Katy, Texas USA) and Coleman (The Coleman Company, Wichita, Kansas USA). Both are 8.5 liter (nine-quart) coolers that were chosen because they adequately held two 1 L bags of saline solution, along with the reusable ice packs designated in the study design, and were small enough for ease of placement on ambulances. Initial testing of the coolers was conducted in a controlled environment. Thereafter, each EMS unit was responsible to cool the saline to less than 48C prior to shift. Data were collected by emergency medical technicians, paramedics, and resident physicians working in seven different ambulance squads. Data analysis was performed using repeated measurements recorded over a 12-hour period from 19 individual coolers and were summarized by individual time points using descriptive statistics. Results: Initial testing determined that the coolers maintained temperatures of 48C for 12 hours in a controlled environment. On the ambulances, results based on the repeated measurements over time revealed that the saline solution samples as defined in the protocol, remained consistently below 48C for 12 hours. Utilizing the lower bound of the 2- sided 95% exact binomial confidence intervals, there was less than a five percent chance that saline samples could not be maintained below 48C for 12 hours, even during the summer months. Conclusions: Simple, commercially available coolers can maintain two 1 L bags of 0.9% NSS at 48C for 12 hours in ambulances in varying environmental conditions. This suggests that EMS agencies could inexpensively initiate prehospital IH in appropriate cases
On the effect of resonances in composite Higgs phenomenology
We consider a generic composite Higgs model based on the coset SO(5)/SO(4)
and study its phenomenology beyond the leading low-energy effective lagrangian
approximation. Our basic goal is to introduce in a controllable and simple way
the lowest-lying, possibly narrow, resonances that may exist is such models. We
do so by proposing a criterion that we call partial UV completion. We
characterize the simplest cases, corresponding respectively to a scalar in
either singlet or tensor representation of SO(4) and to vectors in the adjoint
of SO(4). We study the impact of these resonances on the signals associated to
high-energy vector boson scattering, pointing out for each resonance the
characteristic patterns of depletion and enhancement with respect to the
leading-order chiral lagrangian. En route we derive the O(p^4) general chiral
lagrangian and discuss its peculiar accidental and approximate symmetries.Comment: v3: a few typos corrected. Conclusions unchange
Les traumatismes vertebro-medullaires par chute de la hauteur dâun arbre a propos de 73 cas au Mali.
Introduction Les chutes du haut dâun arbre sont des accidents graves et frĂ©quents au MALI.Objectif Analysez les facteurs Ă©pidĂ©miologiques, Ă©tiologiques et circonstanciels des chutes de la hauteur des arbres MatĂ©riels et mĂ©thodes Il sâagit dâune Ă©tude prospective continue dâoctobre 2007 Ă septembre 2009 Ă lâhĂŽpital Gabriel TourĂ© de Bamako (Mali). Elle a concernĂ© tous les cas de chute du haut dâun arbre pendant cette pĂ©riode.RĂ©sultats Au cours de cette Ă©tude, nous avons recensĂ© 73 patients dont les Ăąges Ă©taient compris entre 5 et 65 ans. Les couches socioprofessionnelles les plus atteintes ont Ă©tĂ© les cultivateurs et les bergers aux conditions socioĂ©conomiques dĂ©favorables. Pendant les mois de dĂ©cembre Ă mai 79,45% (58 patients) des patients ont Ă©tĂ© enregistrĂ©s. Cette pĂ©riode correspondait Ă la traite des fruits et Ă la saison sĂšche avec le manque de pĂąturages pour les animaux. Lâintervention chirurgicale a concernĂ© 32 patients. La mortalitĂ© a Ă©tĂ© de 12,32% (9 patients) tous traumatisĂ©s cervicaux.Conclusions Les accidents par chutes dâarbres sont en rapport avec les conditions socio-Ă©conomiques et climatiques au Mali.Mots clĂ©s : Arbre, Accident, Chute, Mali, Rachis, Traumatism
Electrical detection of 31P spin quantum states
In recent years, a variety of solid-state qubits has been realized, including
quantum dots, superconducting tunnel junctions and point defects. Due to its
potential compatibility with existing microelectronics, the proposal by Kane
based on phosphorus donors in Si has also been pursued intensively. A key issue
of this concept is the readout of the P quantum state. While electrical
measurements of magnetic resonance have been performed on single spins, the
statistical nature of these experiments based on random telegraph noise
measurements has impeded the readout of single spin states. In this letter, we
demonstrate the measurement of the spin state of P donor electrons in silicon
and the observation of Rabi flops by purely electric means, accomplished by
coherent manipulation of spin-dependent charge carrier recombination between
the P donor and paramagnetic localized states at the Si/SiO2 interface via
pulsed electrically detected magnetic resonance. The electron spin information
is shown to be coupled through the hyperfine interaction with the P nucleus,
which demonstrates the feasibility of a recombination-based readout of nuclear
spins
The space group classification of topological band insulators
Topological band insulators (TBIs) are bulk insulating materials which
feature topologically protected metallic states on their boundary. The existing
classification departs from time-reversal symmetry, but the role of the crystal
lattice symmetries in the physics of these topological states remained elusive.
Here we provide the classification of TBIs protected not only by time-reversal,
but also by crystalline symmetries. We find three broad classes of topological
states: (a) Gamma-states robust against general time-reversal invariant
perturbations; (b) Translationally-active states protected from elastic
scattering, but susceptible to topological crystalline disorder; (c) Valley
topological insulators sensitive to the effects of non-topological and
crystalline disorder. These three classes give rise to 18 different
two-dimensional, and, at least 70 three-dimensional TBIs, opening up a route
for the systematic search for new types of TBIs.Comment: Accepted in Nature Physic
Higgs boson enhancement effects on squark-pair production at the LHC
We study the Higgs boson effects on third-generation squark-pair production
in proton-proton collision at the CERN Large Hadron Collider (LHC), including
\Stop \Stop^*, \Stop\Sbot^*, and \Sbot \Sbot^*. We found that substantial
enhancement can be obtained through s-channel exchanges of Higgs bosons at
large , at which the enhancement mainly comes from , , and initial states. We compute the complete set of electroweak
(EW) contributions to all production channels. This completes previous
computations in the literature. We found that the EW contributions can be
significant and can reach up to 25% in more general scenarios and at the
resonance of the heavy Higgs boson. The size of Higgs enhancement is comparable
or even higher than the PDF uncertainties and so must be included in any
reliable analysis. A full analytical computation of all the EW contributions is
presented.Comment: 23 pages, 7 figures, 1 tabl
Properties of 125 GeV Higgs boson in non-decoupling MSSM scenarios
Tantalizing hints of the Higgs boson of mass around 125 GeV have been
reported at the LHC. We explore the MSSM parameter space in which the 125 GeV
state is identified as the heavier of the CP even Higgs bosons, and study two
scenarios where the two photon production rate can be significantly larger than
the standard model (SM). In one scenario, is
enhanced by a light stau contribution, while the () rate
stays around the SM rate. In the other scenario, is
suppressed and not only the but also the
() rates should be enhanced. The rate can be
significantly larger or smaller than the SM rate in both scenarios. Other
common features of the scenarios include top quark decays into charged Higgs
boson, single and pair production of all Higgs bosons in collisions at
GeV.Comment: 20 pages, 5 figures, accepted version for publication in JHE
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