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Search Results: 1 - 10 of 1199 matches for " Kenichi Ohashi "
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Anesthetic Management of a Patient with Sick Sinus Syndrome during General Anesthesia for Maxillofacial Surgery  [PDF]
Kenichi Satoh, Atsumi Ishizuka, Ayako Ohashi, Miho Kumagai, Shigeharu Joh
Open Journal of Anesthesiology (OJAnes) , 2015, DOI: 10.4236/ojanes.2015.54011
Abstract: Sick sinus syndrome (SSS) is a generalized abnormality of cardiac impulse formation. Patients with SSS occasionally need temporary pacing during general anesthesia. The most common issue arising in the perioperative period is electromagnetic interference with device function. We report a case of a 66-year-old man who required temporary cardiac pacing during maxillary cyst extirpation using electrocautery.
Evaluation of Pressure of Arterial Oxygen by Age in Supine Position during General Anesthesia  [PDF]
Kenichi Satoh, Ayako Ohashi, Miho Kumagai, Masahito Sato, Akiyoshi Kuji, Shigeharu Joh
Open Journal of Anesthesiology (OJAnes) , 2015, DOI: 10.4236/ojanes.2015.53008
Abstract: Background: The concentration of supplemental O2 should be measured during general anesthesia to determine whether patients’ pressure of arterial oxygen (PaO2) is correct. Nevertheless, we do not know standard value of PaO2 by age in supine position during general anesthesia. In this study, we evaluated the PaO2 by age at 33% or 40% O2 concentration. Materials and Methods: We retrospectively reviewed the anesthetic charts of 660 patients who were received general anesthesia from January 2001 to December 2013. Patients were divided into two groups by concentration of fraction of inspiratory oxygen: group at 33% or 40%. Second, patients aged 16 - 85 years were classified into 7 groups by age with each group covering one decade. Results: The PaO2 was 185.1 ± 19.2 mmHg (33%) and 209.8 ± 19.8 mmHg (40%) at age 16 - 25 years, 178.7 ± 23.6 mmHg (33%) and 202.7 ± 26.0 mmHg (40%) at age 26 - 35 years, 165.8 ± 30.6 mmHg (33%) and 188.9 ± 22.2 (40%) mmHg at age 36 - 45 years, 154.1 ± 22.8 mmHg (33%) and 181.8 ± 19.2 (40%) mmHg at age 46 - 55 years, 153.7 ± 21.7 mmHg (33%) and 177.5 ± 18.1 mmHg (40%) at age 56 - 65 years, 152.2 ± 24.5 mmHg and 171.0 ± 22.1 mmHg at age 66 - 75 years, and 154.6 ± 24.3 mmHg and 174.1 ± 20.2 mmHg at age 76 - 85 years. Conclusion: The PaO2 tended to decrease with age at both 33% and 40% O2 concentration.
Abnormal Change in Arterial Blood Pressure after Adrenaline-Containing in Lidocaine Infiltrated into Oral Submucosa during General Anesthesia  [PDF]
Kenichi Satoh, Mami Chikuda, Ayako Ohashi, Miho Kumagai, Masahito Sato, Shigeharu Joh
Open Journal of Anesthesiology (OJAnes) , 2015, DOI: 10.4236/ojanes.2015.55015
Abstract: Sudden severe hypotension also occurs in an otherwise stable surgery when adrenaline-containing in lidocaine is infiltrated and care must be taken when using adrenaline-containing in lidocaine because it occasionally induces several adverse reactions. We report the case of a 16-year-old man who scheduled for oral surgery in which abnormal arterial blood pressure changes occurred after adrenaline-containing in lidocaine infiltrated into oral submucosa.
Arterial and End-Tidal Carbon Dioxide in Supine Obese Patients during General Anesthesia  [PDF]
Kenichi Satoh, Mami Chikuda, Ayako Ohashi, Miho Kumagai, Masahito Sato, Akiyoshi Kuji, Shigeharu Joh
Open Journal of Anesthesiology (OJAnes) , 2015, DOI: 10.4236/ojanes.2015.55016
Abstract: Background: We investigated the differences between partial pressure of arterial carbon dioxide and end-tidal carbon dioxide (P(a-ET)CO2) with respect to the Broca-Katsura index (BKI), which is an obesity index, in obese patients during general anesthesia. Materials and Methods: From January 2003 to December 2013, we studied 601 patients aged 16 years old or over undergoing general anesthesia. Patients had American Society of Anesthesiology physical status I and II and we reviewed their anesthetic charts. The P(a-ET)CO2 with respect to the BKI divided patients into two groups: 16 to < 65 years old, and ≥ 65 years old, and compared the P(a-ET)CO2 values between the two groups. Results: In patients aged 16 to < 65 years old, the mean P(a-ET)CO2 was 2.2 ± 3.1 mmHg at BKI < 20%; 3.3 ± 3.1 mmHg at 20% < BKI < 40%; and 5.5 ± 5.0 mmHg at 40% < BKI < 60%. In patients aged ≥ 65 years old , the mean P(a-ET)CO2 was 3.2 ± 4.1 mmHg at BKI < 20%; 4.3 ± 3.6 mmHg at 20% to < 40%; and 4.4 ± 3.3 mmHg at 40% to < 60%. Conclusion: The P(a-ET)CO2 tends to increase in obese patients during general anesthesia with increasing BKI in patients aged 16 to < 65 years old.
Evaluation of Partial Pressure of Arterial Oxygen in Obese Patients in Supine Position during General Anesthesia  [PDF]
Kenichi Satoh, Mami Chikuda, Ayako Ohashi, Miho Kumagai, Akiyoshi Kuji, Shigeharu Joh
Open Journal of Anesthesiology (OJAnes) , 2015, DOI: 10.4236/ojanes.2015.55017
Abstract: Background: Anesthetists should measure the concentration of supplemental oxygen to determine whether patients’ partial pressure of arterial oxygen (PaO2) is correct during general anesthesia. However, the standard PaO2 value in obese patients in the supine position is unknown. We evaluated the PaO2 with respect to the Broca-Katsura obesity index. Materials and Methods: From January 2001 to December 2013, we evaluated 472 patients aged ≥16 years old that underwent general anesthesia in the supine position. The anesthetic charts of 472 patients with an American Society of Anesthesiologists physical status of I or II were retrospectively reviewed to investigate the PaO2. Results: In patients aged 16 to <65 years old, the PaO2 was 165.7 ± 25.6 mmHg at a Broca-Katsura index of <20%, 141.8 ± 26.9 mmHg at a Broca-Katsura index of 20% to <40%, 132.7 ± 22.7 mmHg at a Broca-Katsura index of 40% to <60%, and 111.7 ± 34.6 mmHg at a Broca-Katsura index of ≥60%. In patients aged 65 to <84 years old, the PaO2 was 152.1 ± 23.8 mmHg at a Broca-Katsura index of <20%, 130.6 ± 26.7 mmHg at a Broca-Katsura index of 20% to <40%, and 127.5 ± 11.3 mmHg at a Broca-Katsura index of 40% to <60%. Conclusion: With an increasing Broca-Katsura index, the PaO2 tended to decrease with age from 16 to <65 years old and 65 to <84 years old. Additionally, the PaO2 tended to decrease with age from 16 to <65 years at a Broca-Katsura index of 20% to <40%.
Quantum condensation in electron-hole bilayers with density imbalance
Kazuo Yamashita,Kenichi Asano,Takuma Ohashi
Physics , 2009, DOI: 10.1143/JPSJ.79.033001
Abstract: We study the two-dimensional spatially separated electron-hole system with density imbalance at absolute zero temperature. By means of the mean-field theory, we find that the Fulde-Ferrell state is fairly stabilized by the order parameter mixing effect.
Electrodialytic Transport Properties of Anion-Exchange Membranes Prepared from Poly(vinyl alcohol) and Poly(vinyl alcohol-co-methacryloyl aminopropyl trimethyl ammonium chloride)
Atsushi Jikihara,Reina Ohashi,Yuriko Kakihana,Mitsuru Higa,Kenichi Kobayashi
Membranes , 2013, DOI: 10.3390/membranes3010001
Abstract: Random-type anion-exchange membranes (AEMs) have been prepared by blending poly(vinyl alcohol) (PVA) and the random copolymer-type polycation, poly(vinyl alcohol- co-methacryloyl aminopropyl trimethyl ammonium chloride) at various molar percentages of anion-exchange groups to vinyl alcohol groups, C pc, and by cross-linking the PVA chains with glutaraldehyde (GA) solution at various GA concentrations, C GA. The characteristics of the random-type AEMs were compared with blend-type AEMs prepared in our previous study. At equal molar percentages of the anion exchange groups, the water content of the random-type AEMs was lower than that of the blend-type AEMs. The effective charge density of the random-type AEMs increased with increasing C pc and reached a maximum value. Further, the maximum value of the effective charge density increased with increasing C GA. The maximum value of the effective charge density, 0.42 mol/dm 3, was obtained for the random-type AEM with C pc = 4.2 mol % and C GA = 0.15 vol %. A comparison of the random-type and blend-type AEMs with almost the same C pc showed that the random-type AEMs had lower membrane resistance than the blend-type ones. The membrane resistance and dynamic transport number of the random-type AEM with C pc = 6.0 mol % and C GA = 0.15 vol % were 4.8 Ω cm 2 and 0.83, respectively.
Observation of Rapid Change of Crystalline Structure during the Phase Transition of the Palladium-Hydrogen System
Akio Kawasaki,Satoshi Itoh,Kunihiro Shima,Kenichi Kato,Haruhiko Ohashi,Tetsuya Ishikawa,Toshimitsu Yamazaki
Physics , 2015, DOI: 10.1039/C5CP02725J
Abstract: We performed an X-ray diffraction experiment while palladium bulk absorbed and desorbed hydrogen to investigate the behavior of the crystalline lattice during the phase transition between the $\alpha$ phase and $\beta$ phase. Fast growth of $\beta$ phase was observed around x=0.1 and x=0.45 of PdH$_x$. In addition, slight compression of the lattice at high hydrogen concentration and increase in the lattice constant and the line width of the $\alpha$ phase after a cycle of absorption and desorption of hydrogen was observed. These behavior correlated with the change in the sample length, which may infer that the change in shape was related to the phase transition.
Non-Abelian Vortices of Higher Winding Numbers
Minoru Eto,Kenichi Konishi,Giacomo Marmorini,Muneto Nitta,Keisuke Ohashi,Walter Vinci,Naoto Yokoi
Mathematics , 2006, DOI: 10.1103/PhysRevD.74.065021
Abstract: We make a detailed study of the moduli space of winding number two (k=2) axially symmetric vortices (or equivalently, of co-axial composite of two fundamental vortices), occurring in U(2) gauge theory with two flavors in the Higgs phase, recently discussed by Hashimoto-Tong (hep-th/0506022) and Auzzi-Shifman-Yung (hep-th/0511150). We find that it is a weighted projective space WCP^2_(2,1,1)=CP^2/Z_2. This manifold contains an A_1-type (Z_2) orbifold singularity even though the full moduli space including the relative position moduli is smooth. The SU(2) transformation properties of such vortices are studied. Our results are then generalized to U(N) gauge theory with N flavors, where the internal moduli space of k=2 axially symmetric vortices is found to be a weighted Grassmannian manifold. It contains singularities along a submanifold.
Novel Cathode Materials for Sodium Ion Batteries Derived from Layer Structured Titanate Cs2Ti5O11·(1 + x)H2O  [PDF]
Masao Ohashi
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.96037
Abstract: A layer structured titanate Cs2Ti5O11·(1 + x)H2O (x = 0.70) has been prepared in a solid state reaction using Cs2CO3 and anatase type TiO2 at 900°C. Ion exchange reactions of Cs+ in the interlayer space were studied in aqueous solutions. The single phases of Li+, Na+ and H+ exchange products were obtained. The three kinds of resulting titanates were evaluated for use as the cathodes in rechargeable sodium batteries after dehydrations by heating at 200°C in a vacuum. The electrochemical measurements showed that they exhibited the reversible Na+ intercalation-deintercalation in a voltage range of 0.5 - 3.5 V or 0.7 - 4.0 V. The Li+ exchange product showed the best performance of the discharge-charge capacities in this study. The initial Na+ intercalation-deintercalation capacities of the Li2Ti5O11 were 120 mAh/g and 100 mAh/g; the amounts of Na+ correspond to 1.9 and 1.6 of the formula unit, respectively. The titanates are nontoxic, inexpensive and environmentally benign.
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