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Search Results: 1 - 10 of 1025 matches for " Yoshihiro Kasagi "
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Comparison of Clinical Problems in Thoracoscopic Esophagectomy between Prone Position with Pneumothorax Procedure and Lateral Position  [PDF]
Yoshihiro Kasagi,Ryu Okutani,Yukiko Komatsu,Yutaka Oda
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.33034
Abstract: Study Objective: We compared the effects of intraoperative body position on blood gas and fluid balance in patients undergoing a thoracoscopic esophagectomy as well as during operation and postoperative laboratory data. Design: Prospective study. Setting: Operating room and intensive care unit. Patients: ASA physical status 1 and 2 patients (n = 26), scheduled for elective thoracoscopic esophagectomy and immediate reconstruction under general anesthesia with one-lung ventilation were enrolled. Interventions: Patients were assigned to either the lateral (n = 16) or prone (n = 10) position groups based on the planned intraoperative body position. A pneumothorax procedure was concomitantly performed only in the prone position group. Measurements: Fluid balance, PaO2/FIO2 ratio (P/F ratio), and maximum PaCO2 during the operation and postoperative laboratory data were analyzed. Main Results: There were no significant differences between the groups for amount of blood loss, blood transfusion, fluid infusion, or urine output. The P/F ratio during one-lung ventilation was significantly higher in the prone than the lateral position group (379 ± 122 vs. 297 ± 67 mmHg, p = 0.017), as was maximum intraoperative PaCO2 (72.2 ± 15.6 vs. 48.3 ± 6.3 mmHg, p < 0.001). Conclusions: A thoracoscopic esophagectomy in the prone position performed concomitantly with a CO2 pneumothorax procedure resulted in a significantly better P/F ratio during one-lung ventilation as compared to the lateral position, indicating that the prone position is more advantageous for oxygenation.
Comparison of Clinical Problems in Thoracoscopic Esophagectomy between Prone Position with Pneumothorax Procedure and Lateral Position  [PDF]
Yoshihiro Kasagi, Ryu Okutani, Yukiko Komatsu, Yutaka Oda, Yoshito Yamashita
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.33034
Abstract:

Study Objective: We compared the effects of intraoperative body position on blood gas and fluid balance in patients undergoing a thoracoscopic esophagectomy as well as during operation and postoperative laboratory data. Design: Prospective study. Setting: Operating room and intensive care unit. Patients: ASA physical status 1 and 2 patients (n = 26), scheduled for elective thoracoscopic esophagectomy and immediate reconstruction under general anesthesia with one-lung ventilation were enrolled. Interventions: Patients were assigned to either the lateral (n = 16) or prone (n = 10) position groups based on the planned intraoperative body position. A pneumothorax procedure was concomitantly performed only in the prone position group. Measurements: Fluid balance, PaO2/FIO2 ratio (P/F ratio), and maximum PaCO2 during the operation and postoperative laboratory data were analyzed. Main Results: There were no significant differences between the groups for amount of blood loss, blood transfusion, fluid infusion, or urine output. The P/F ratio during one-lung ventilation was significantly higher in the prone than the lateral position group (379 ± 122 vs. 297 ± 67 mmHg, p = 0.017), as was maximum intraoperative PaCO2

Usefulness of Monitoring Stroke Volume Variations for Fluid Management During Pediatric Living-Donor Liver Transplantation  [PDF]
Yoshihiro Kasagi, Manabu Hashimoto, Shugo Kasuya, Seisuke Sakamoto, Mureo Kasahara, Yasuyuki Suzuki, Eiichi Inada
Open Journal of Anesthesiology (OJAnes) , 2012, DOI: 10.4236/ojanes.2012.24033
Abstract: Purpose: Central venous pressure (CVP) is considered to be unsuitable as preload parameter. Stroke volume variation (SVV) has recently been reported to be effective as a preload and fluid responsiveness parameter, and its usefulness for fluid management during living-donor liver transplantation (LDLT). However, use of SVV has not been reported in children. Our aim is to evaluate the use of SVV as a target parameter of circulating blood volume during pediatric LDLT. Methods: This retrospective study was conducted in 40 consecutive patients aged between 5 and 109 months who underwent elective LDLT. Twenty patients underwent LDLT without FloTrac? (C group) and the rest patients underwent LDLT with the FloTrac? monitoring (F group). As a fluid management target, CVP was maintained at 10 mmHg in the C group and SVV at 10% in the F group. We compared MAP and CVP at the times of the greatest decrease within 5 minutes after reperfusion. Results: MAP after reperfusion was significantly decreased in both groups (P < 0.01), with the magnitude of decrease significantly greater in the C group compared with the F group (P = 0.02). MAP before and after reperfusion did not significantly differ between the groups. After reperfusion, CVP was nearly the same in both groups, with that in the C group slightly decreased and nearly no change in the F group. SVV after reperfusion was significantly increased (P < 0.001). Conclusion: When used as a target parameter for fluid management during pediatric LDLT, hemodynamic changes was less when SVV was used as the parameter of circulating blood volume.
Effects of Self-Presentation on One’s Self-Regulatory Resources When One Is Faced with the Multiple Audience Problem  [PDF]
Yu Kasagi, Ikuo Daibo
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.612141
Abstract: This study examined the effects of self-presentation on participants’ self-regulatory resources when the participants were faced with the multiple audience problem. In the experiment, participants (N = 38) were assigned to either the consistent condition or inconsistent condition, and were asked to make a speech in three sessions. The inconsistent condition was manipulated such that the participants would be confronted with the multiple audience problem in speech session 3. After the three speech sessions, the participants were told to work on 200 multiplication problems (3 digits × 3 digits) until they had finished solving all the problems or until they gave up or felt that they were unable to continue working on the problems. An experimenter timed the participants with a stopwatch as they worked on the problems. The results showed that the participants in the inconsistent condition gave up faster than the participants in the consistent condition. Moreover, the participants in the inconsistent condition solved less multiplication problems than the participants in the consistent condition. On the basis of these results, we concluded that when one was faced with the multiple audience problem, self-presentation was extremely difficult and entailed effortful forms of self-presentation that depleted one’s self-regulatory resources. Further research is necessary to examine the effects of compensatory self-enhancement, which has been found to be an effective coping strategy on self-regulatory resources when one is faced with the multiple audience problem.
Characteristics and Factors Associated with Obesity and Thinness among Children with Developmental Disorders  [PDF]
Keiko Kasagi, Yuko Hayashi, Ryoko Ito
Open Journal of Nursing (OJN) , 2018, DOI: 10.4236/ojn.2018.89051
Abstract: Obesity in childhood or adolescence has been recognized to be a risk factor for the onset of lifestyle-related diseases, not only in healthy children, but also in children with developmental disorders. Therefore, this study was conducted to examine the characteristics of obesity and thinness as assessed by the body fat percentage among children with developmental disorders during certain growth periods. It was also designed to investigate those factors associated with obesity and thinness based on a lifestyle and behavioral questionnaire. The subjects included 260 children from 5 to 18 years old with developmental disorders. The results of the study showed that a decrease in thinness and increase in obesity with ageing exhibited more noticeable trends among those children with mental retardation. The factors associated with obesity in children with developmental disorders were characterized by the dietary content, eating behaviors, and food preferences particular to such children, as well as low physical activity and a family history of obesity. The results of this study suggested the importance of continuous guidance along with family participation in order to improve obesity among children with developmental disorders, while focusing on the characteristics of certain growth periods.
TGF-beta1 on osteoimmunology and the bone component cells
Shimpei Kasagi, Wanjun Chen
Cell & Bioscience , 2013, DOI: 10.1186/2045-3701-3-4
Abstract: Bone is a rigid organ that constitutes part of the endoskeleton of vertebrates. It serves multiple functions; providing mechanical support for joints and tendons, protecting soft tissue or various organs from mechanical stress or trauma, storing minerals, generating hematopoietic cells, and producing hormones. These many functions are regulated by several soluble factors. Interestingly, accumulated evidence indicates that transforming growth factor beta 1 (TGF-β1) plays a critical role in bone formation, mineral storage, and hematopoietic cell generation. In addition, recent progress in the study of the cross-talk between the skeletal system and the immune system (termed osteoimmunology) has revealed shared components and mechanisms between the two systems [1]. This review highlights recent findings focusing on the role of TGF-β1 in bone metabolism and osteoimmunology.TGF-β1 is a one of the most potent regulatory cytokines with diverse effects on hematopoietic cells. In the immune system, TGF-β1 induces and maintains immune tolerance by regulation of lymphocyte proliferation, differentiation, and survival. Disruption of TGF-β1 results in a dysregulated immune system [2], leading to inappropriate immune cell activation, inflammation, cancer (Leukemia and malignant lymphoma etc) and autoimmune diseases [3]. In fact, TGF-β1-deficient mice (TGF-β1ko) die within 2-3 weeks after birth due to lymphocyte and monocyte infiltration of multiple vital organs [3,4]. CD4+Foxp3+ T cells that predominantly produce anti-inflammatory cytokines (TGF-β, IL-10), but not inflammatory cytokines (IFN-γ, TNF-α, and IL-17) are known as regulatory T cells (Tregs). They inhibit the action of other effector T cells through soluble factors (TGF-β or IL-10) or cell-to-cell contact [5]. It is well known that TGF-β suppresses inflammatory cytokine production by effector T cells, and additionally, it drives the differentiation of na?ve T cells to CD4+CD25+Foxp3+ Tregs [6]. Moreover, TGF-β controls t
Frequency Range Dependent TE10 to TE40 Metallic Waveguide Mode Converter  [PDF]
Yoshihiro Kokubo
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.37046
Abstract: Dielectric rod arrays in a metallic waveguide alter the propagation modes and group velocities of electromagnetic waves. We focus on TE10-to-TE20 mode converters and investigate the variation in their behavior with frequency. In this investigation, a mode converter is proposed that passes the TE10 mode at frequencies lower than 2fc, and converts the TE10 mode into the TE40 mode for frequencies higher than 2fc, which is achieved by a combination of TE10-TE20 mode converters.
Simple Method to Change the Magnetic Resonant Frequencies of Short Wire Pairs  [PDF]
Yoshihiro Kokubo
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2013, DOI: 10.4236/jemaa.2013.54026
Abstract:

Short wire pairs are simple metamaterial structures. This structure includes a dielectric substrate with metal strips on both sides, of which the electric and magnetic resonant frequencies can be controlled by adjusting the length of the metallic wires. However, to vary the magnetic resonant frequency requires a change in the length of the strip and another patterned photomask. In this investigation, a simple method is introduced that requires only one patterned photomask by shifting the position of faced wire pairs up and down.

A Short Derivation of the Kuhn-Tucker Conditions  [PDF]
Yoshihiro Tanaka
Open Journal of Optimization (OJOp) , 2015, DOI: 10.4236/ojop.2015.42006
Abstract: The Kuhn-Tucker conditions have been used to derive many significant results in economics. However, thus far, their derivation has been a little bit troublesome. The author directly derives the Kuhn-Tucker conditions by applying a corollary of Farkas’s lemma under the Mangasarian-Fromovitz constraint qualification and shows the boundedness of Lagrange multipliers.
Existence and Stability Property of Almost Periodic Solutions in Discrete Almost Periodic Systems  [PDF]
Yoshihiro Hamaya
Advances in Pure Mathematics (APM) , 2018, DOI: 10.4236/apm.2018.85026
Abstract: In this paper, we consider an almost periodic system which includes a system of the type \"\", where k is a positive integer, aij are almost periodic in n and satisfy aij(n)≥0 for i≠j,?\"\" for 1≤j≤m. In the special case where aij(n) are constant functions, above system is a mathematical model of gas dynamics and was treated by T. Carleman and R. D. Jenks for differential systems. In the main theorem, we show that if the m X m matrix (aij(n)) is irreducible, then there exists a positive almost periodic solution which is unique and has some stability. Moreover, we can see that this result gives R. D. Jenks’ result for differential model in the case where aij(n) are constant functions. In Section 3, we consider the linear system with variable cofficients \"\". Even in nonlinear problems, this linear system plays an important role, as their variational equations, and it is requested to determine the uniform asymptotically stability of the zero solution from the information about A(n). In order to obtain the existence of almost periodic solutions of both linear and nonlinear almost periodic discrete systems: above linear system and?\"\" for 1≤i≤m, respectively, we shall consider between certain stability properties, which are referred to as uniformly asymptotically stable, and the diagonal dominance matrix condition.
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