1,586 research outputs found
Anaesthesia for a morbidly obese patient with schizophrenia and intellectual disability
We report the case of a morbidly obese woman with schizophrenia and intellectual disability who underwent dental treatment using general anaesthesia. The 38-year-old patient was 156 cm tall and weighed 140 kg, with a body mass index of 57.5 kg.m-2. Her developmental age was less than five or six years. She had been taking several antipsychotic agents, including haloperidol. Tracheal intubation was performed smoothly and anaesthesia was maintained uneventfully using propofol and remifentanil.This case demonstrates that the method of general anaesthesia presented here can be used safely in managing patients with these kinds of disabilities
General anaesthesia with and without intubation for patients with Cornelia de Lange syndrome
We present the use of different methods of general anaesthesia in two patients with Cornelia de Lange syndrome and its contribution to the patients’ oral health.Case 1: The patient was a 22-year-old woman with Cornelia de Lange syndrome who underwent dental treatment under general anaesthesia. She exhibited the physical characteristics of Cornelia de Lange syndrome, including a small mouth, thin lips, short limbs, stiffness of joints and intellectual disability. General anaesthesia without intubation was performed safely eight times. No other complications except hypersensitivity to hypnotic agents were observed.Case 2: The patient was a 10-year-old boy with Cornelia de Lange syndrome who underwent dental treatment under general anaesthesia. He had a history and symptoms of obstructive airway disorders in addition to showing physical characteristics of the syndrome similar to those seen in Case 1. General anaesthesia with nasal intubation was performed safely twice. Computed tomography (CT) of his head and neck produced unremarkable results. These cases demonstrate that both general anaesthesia with and without nasal intubation can be safely used in managing individuals with Cornelia de Lange syndrome during dental treatment.Keywords: general anaesthesia; Cornelia de Lange syndrome; dental treatmen
Impact ionization in GaAs: a screened exchange density functional approach
Results are presented of a fully ab-initio calculation of impact ionization
rates in GaAs within the density functional theory framework, using a
screened-exchange formalism and the highly precise all-electron full-potential
linearized augmented plane wave (FLAPW) method. The calculated impact
ionization rates show a marked orientation dependence in {\bf k} space,
indicating the strong restrictions imposed by the conservation of energy and
momentum. This anisotropy diminishes as the impacting electron energy
increases. A Keldysh type fit performed on the energy-dependent rate shows a
rather soft edge and a threshold energy greater than the direct band gap. The
consistency with available Monte Carlo and empirical pseudopotential
calculations shows the reliability of our approach and paves the way to
ab-initio calculations of pair production rates in new and more complex
materials.Comment: 11 pages, 4 figures, Submitted to Phys. Rev.
Measurement of parity-nonconserving rotation of neutron spin in the 0.734-eV p-wave resonance of
The parity nonconserving spin rotation of neutrons in the 0.734-eV p-wave
resonance of was measured with the neutron transmission method. Two
optically polarized cells were used before and behind a a 5-cm long
target as a polarizer and an analyzer of neutron spin. The rotation
angle was carefully measured by flipping the direction of polarization
in the polarizer in sequence. The peak-to-peak value of the spin rotation was
found to be rad/cm which was consistent with
the previous experiments. But the result was statisticallly improved. The s-p
mixing model gives the weak matrix element as meV. The
value agrees well with the one deduced from the parity-nonconserving
longitudinal asymmetry in the same resonance
X-ray diffraction measurements of the c-axis Debye-Waller factors of YBa2Cu3O7 and HgBa2CaCu2O6
We report the first application of x-rays to the measurement of the
temperature dependent Bragg peak intensities to obtain Debye-Waller factors on
high-temperature superconductors. Intensities of (0,0,l) peaks of YBa2Cu3O7 and
HgBa2CaCu2O6 thin films are measured to obtain the c-axis Debye-Waller factors.
While lattice constant and some Debye-Waller factor measurements on high Tc
superconductors show anomalies at the transition temperature, our measurements
by x-ray diffraction show a smooth transition of the c-axis Debye-Waller
factors through T. This suggests that the dynamic displacements of the
heavy elements along the c-axis direction in these compounds do not have
anomalies at Tc. This method in combination with measurements by other
techniques will give more details concerning dynamics of the lattice.Comment: 4 pages, 2 figures. To be published in Physical Review B (Brief
Report
Electronic structures of doped anatase : (M=Co, Mn, Fe, Ni)
We have investigated electronic structures of a room temperature diluted
magnetic semiconductor : Co-doped anatase . We have obtained the
half-metallic ground state in the local-spin-density approximation(LSDA) but
the insulating ground state in the LSDA++SO incorporating the spin-orbit
interaction. In the stoichiometric case, the low spin state of Co is realized
with the substantially large orbital moment. However, in the presence of oxygen
vacancies near Co, the spin state of Co becomes intermediate. The
ferromagnetisms in the metallic and insulating phases are accounted for by the
double-exchange-like and the superexchange mechanism, respectively. Further,
the magnetic ground states are obtained for Mn and Fe doped ,
while the paramagnetic ground state for Ni-doped .Comment: 5 pages, 4 figure
Nitrogen doping of TiO2 photocatalyst forms a second eg state in the Oxygen (1s) NEXAFS pre-edge
Close inspection of the pre-edge in oxygen near-edge x-ray absorption fine
structure spectra of single step, gas phase synthesized titanium oxynitride
photocatalysts with 20 nm particle size reveals an additional eg resonance in
the VB that went unnoticed in previous TiO2 anion doping studies. The relative
spectral weight of this Ti(3d)-O(2p) hybridized state with respect to and
located between the readily established t2g and eg resonances scales
qualitatively with the photocatalytic decomposition power, suggesting that this
extra resonance bears co-responsibility for the photocatalytic performance of
titanium oxynitrides at visible light wavelengths
Quantum Critical Behavior and Possible Triplet Superconductivity in Electron Doped CoO2 Sheets
Density functional calculations are used to investigate the doping dependence
of the electronic structure and magnetic properties in hexagonal NaCoO.
The electronic structure is found to be highly two dimensional, even without
accounting for the structural changes associated with hydration. At the local
spin density approximation level, a weak itinerant ferromagnetic state is
predicted for all doping levels in the range to , with competing
but weaker itinerant antiferromagnetic solutions. The Fermi surface, as
expected, consists of simple rounded hexagonal cylinders, with additional small
pockets depending on the lattice parameter. Comparison with experiment
implies substantial magnetic quantum fluctuations. Based on the Fermi surface
size and the ferromagnetic tendency of this material,it is speculated that a
triplet superconducting state analogous to that in SrRuO may exist
here.Comment: 4 pages, 1 figur
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