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Hecimovich M, King D, Murphy M, Koyama K. An investigation into the measurement properties of the King-Devick Eye Tracking system. Journal of Concussion 2022. [DOI: 10.1177/20597002221082865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Objectives Eye tracking has been gaining increasing attention as a possible assessment and monitoring tool for concussion. The King-Devick test (K-DT) was expanded to include an infrared video-oculography-based eye tracker (K-D ET). Therefore, the aim was to provide evidence on the reliability of the K-D ET system under an exercise condition. Methods Participants (N = 61; 26 male, 35 female; age range 19-25) were allocated to an exercise or sedentary group. Both groups completed a baseline K-D ET measurement and then either two 10-min exercise or sedentary interventions with repeated K-D ET measurements between interventions. Results The test-retest reliability of the K-D ET ranged from good to excellent for the different variables measured. The mean ± SD of the differences for the total number of saccades was 1.04 ± 4.01 and there was an observable difference (p = 0.005) in the trial number. There were no observable differences for the intervention (p = 0.768), gender (p = 0.121) and trial (p = 0.777) for average saccade’s velocity. The mean ± SD of the difference of the total fixations before and after intervention across both trials was 1.04 ± 3.63 and there was an observable difference in the trial number (p = 0.025). The mean ± SD of the differences for the Inter-Saccadic Interval and the fixation polyarea before and after intervention across both trials were 1.86 ± 22.99 msec and 0.51 ± 59.11 mm2 and no observable differences for the intervention, gender and trial. Conclusion The results provide evidence on the reliability of the K-D ET, and the eye-tracking components and demonstrate the relationship between completion time and other variables of the K-D ET system. This is vital as the use of the K-DT may be increasing and the combination of the K-DT and eye tracking as one single package highlights the need to specifically measure the reliability of this combined unit.
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Affiliation(s)
- M. Hecimovich
- Division of Athletic Training, University of Northern Iowa, Cedar Falls, Iowa, USA
| | - D. King
- Sports Performance Research Institute New Zealand (SPRINZ) at AUT Millennium, Faculty of Health and Environmental Science, Auckland University of Technology, Auckland, New Zealand
- Traumatic Brain injury Network (TBIN), Auckland University of Technology, Auckland, New Zealand
- Department of Science and Technology, University of New England, Sydney, Australia
| | - M. Murphy
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia, Australia
- SportsMed Subiaco, St John of God Health Care, Subiaco, Western Australia, Australia
| | - K. Koyama
- Department of Rehabilitation Medicine, Gunma University Graduate School of Medicine
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2
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Dobashi S, Hashimoto M, Koyama K, Ando D. Impact of acute resistance exercise on circulating secreted protein acidic and rich in cysteine (SPARC) levels in healthy young males: A pilot study. Sci Sports 2021. [DOI: 10.1016/j.scispo.2020.12.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Hiratsuka M, Koyama K, Ito M, Sato R, Suzuki K, Ito Y, Namba-Hamano T, Hamano T. Autopsy Findings of Heterozygous Fabry Disease with the Severe Phenotype: A Case Report. Nephron Clin Pract 2021; 146:203-208. [PMID: 34808632 DOI: 10.1159/000520145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 10/01/2021] [Indexed: 11/19/2022] Open
Abstract
Fabry disease (FD) is an inherited X-linked lysosomal storage disorder, with hemizygous males being more severely affected than heterozygous females. Herein, we report a rare case of FD in a heterozygous female with a severe phenotype. The patient had obesity and hyperlipidemia and had her first cerebral infarction at the age of 33 years. She underwent renal biopsy and was diagnosed with FD with morphological features of focal segmental glomerulosclerosis nephropathy at the age of 34 years. Her leukocyte alpha-galactosidase A activity was 2.3 Agal/U (normal: >20 Agal/U), and genetic analysis revealed the presence of the classical phenotype. Enzyme replacement therapy (ERT) was initiated at the age of 35 years; however, peritoneal dialysis owing to end-stage renal failure occurred at the age of 37 years. The patient died of a cerebral hemorrhage at the age of 44 years. Her Mainz Severity Score Index at the time of death was 48/76, suggestive of the severe phenotype. Autopsy findings revealed remarkable globotriaosylceramide accumulation on electron microscopy, particularly in the major organs and their vascular smooth muscle cells. Regarding the vertebral arteries which sourced the cerebral hemorrhage, the effects of FD-induced vascular thickening and long-term renal failure-induced atherosclerosis were confirmed. Furthermore, the patient's vascular sclerosis was modified with acquired factors such as lifestyle-related disease associated with obesity. We recommend intensified treatment for metabolic factors simultaneous with ERT to help in delaying the progression of FD.
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Affiliation(s)
- Maki Hiratsuka
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Katsushi Koyama
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Makoto Ito
- Department of Pathology, Kariya Toyota General Hospital, Aichi, Japan
| | - Ryo Sato
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Kodai Suzuki
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Yuki Ito
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Tomoko Namba-Hamano
- Department of Nephrology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Takayuki Hamano
- Department of Nephrology, Nagoya City University Graduate School of Medical Sciences, Aichi, Japan
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4
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Miura S, Azuma K, Yoshioka H, Teraoka S, Ishii H, Koyama K, Kibata K, Ozawa Y, Tokito T, Koh Y, Shimokawa T, Kurata T, Yamamoto N, Tanaka H. MA02.05 A Phase I Study of Afatinib in Combination With Osimertinib in Patients After Failure of Prior Osimertinib. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.08.114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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5
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Sawada N, Nakanishi K, Daimon M, Yoshida Y, Ishiwata J, Hirokawa M, Koyama K, Nakao T, Morita H, Di Tullio M, Homma S, Komuro I. Visceral fat accumulation and left atrial phasic function in the general population. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Obesity carries independent risk for incident atrial fibrillation (AF), although the impact of abdominal fat distribution on LA morphological and functional remodeling is not fully elucidated. Speckle-tracking echocardiography is a novel and sensitive tool that allows quantification and detection of subtle alterations in left atrial (LA) phasic function.
Purpose
This study aimed to investigate whether increased visceral adiposity is independently associated with impaired LA phasic function in a community-based cohort.
Methods
We included 527 participants without overt cardiac disease who underwent laboratory testing, abdominal computed tomographic examination and speckle-tracking echocardiography. Abdominal adiposity was quantitatively assessed as visceral fat area (VFA) and subcutaneous fat area (SFA) at the level of the umbilicus. Speckle-tracking echocardiography was performed to assess LA phasic function including reservoir, conduit and pump strain as well as left ventricular global longitudinal strain (LVGLS).
Results
Mean age was 57±10 years and 362 of the participants (69%) were men. LA reservoir and conduit strain were decreased according to the VFA quartiles (both p<0.05), whereas there was no significant difference in LA volume index and LA pump strain. When stratified by SFA, there was no significant differences in LA volume index and all LA phasic strain across the quartiles. In multivariable analysis, VFA as continuous variable was significantly associated with LA conduit strain, independent of traditional cardiovascular risk factors, pertinent laboratory parameters and LV morphology and function including LVGLS (standardized b=−0.146, p=0.011). Representative cases are shown in the Figure.
Conclusion
In a sample of the general population, VFA accumulation was independently associated with worse LA conduit strain, which may be involved in the pathophysiological mechanism of obesity-related AF.
Funding Acknowledgement
Type of funding source: Foundation. Main funding source(s): Yamauchi Susumu Scholarship for Cardiovascular Research
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Affiliation(s)
- N Sawada
- The University of Tokyo, Tokyo, Japan
| | | | - M Daimon
- The University of Tokyo, Tokyo, Japan
| | - Y Yoshida
- The University of Tokyo, Tokyo, Japan
| | | | | | - K Koyama
- The University of Tokyo, Tokyo, Japan
| | - T Nakao
- The University of Tokyo, Tokyo, Japan
| | - H Morita
- The University of Tokyo, Tokyo, Japan
| | - M Di Tullio
- Columbia University, New York, United States of America
| | - S Homma
- Columbia University, New York, United States of America
| | - I Komuro
- The University of Tokyo, Tokyo, Japan
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6
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Hiratsuka M, Koyama K, Takahashi H, Kasugai T, Hagita J, Kondo A, Koike K, Hamano T. Low plantar skin perfusion pressure predicts long-term atherosclerotic vascular events and mortality in maintenance haemodialysis patients. Atherosclerosis 2020; 312:66-71. [DOI: 10.1016/j.atherosclerosis.2020.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 08/01/2020] [Accepted: 09/07/2020] [Indexed: 10/23/2022]
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Kamon T, Kaneko H, Itoh H, Kiriyama H, Koyama K, Fujiu K, Morita H, Uno K, Hayashi N, Komuro I. Association between insulin resistance and left ventricular diastolic dysfunction in non-diabetic general population. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Insulin resistance due to visceral fat accumulation plays a central role in the development of diabetic mellitus and subsequent cardiovascular disease. Abdominal obesity and diabetic mellitus are associated with the progression of left ventricular diastolic dysfunction which is the major structural abnormality in patients with heart failure. However, whether insulin resistance influences left ventricular diastolic dysfunction in non-diabetic subjects is unclear.
Purpose
In this study, we aimed to clarify the association between insulin resistance and left ventricular diastolic dysfunction in non-diabetic general population.
Methods
We examined 2,572 non-diabetic subjects with preserved left ventricular systolic function (ejection fraction ≥50%) and without a past history of diabetic mellitus, heart failure, coronary artery disease, atrial fibrillation, stroke, moderate to severe valvular disease, who underwent medical check-ups at the University of Tokyo Hospital from January 2009 to December 2018. Diabetes mellitus was defined as fasting glucose level ≥126 mg/dL or a subject's use of oral antidiabetic medications or insulin. We calculated the Homeostasis Model Assessment-Insulin Resistance (HOMA-IR) score [HOMA-IR = fasting glucose (mg/dL) × insulin (μU/mL) / 405], and defined insulin resistance as HOMA-IR ≥2.5. Left ventricular diastolic function was assessed by echocardiography, using tissue doppler analysis (E/E' ratio in septal and lateral). Visceral adiposity was assessed as visceral fat volume measured by computed tomography scanner.
Results
Mean age was 53.3±9.8 years, and 1,746 subjects (67.9%) were male. Overall, HOMA-IR was 1.1 on average, and HOMA-IR ≥2.5 was observed in 5.0% of study population. BMI and the prevalence of obesity were higher in subjects with HOMA-IR ≥2.5 than in those without. There was no significant difference in left ventricular ejection fraction between HOMA-IR ≥2.5 and ≤2.5. E/E' ratio in septal and lateral were higher in subjects with HOMA-IR ≥2.5 than in those without. Multivariable logistic regression analysis demonstrated that obesity and waist circumference, visceral fat volume were independently associated with HOMA-IR ≥2.5, however, age, hypertension, hypercholesterolemia were not. Further, multiple regression analysis including insulin resistance, age, male gender, obesity, hypertension, hypercholesterolemia, cigarette smoking and visceral fat volume, showed that insulin resistance was an independent determinant of increasing E/E' in both septal and lateral, whereas visceral fat volume was not (Figure 1).
Conclusion
The results of the present study suggest that insulin resistance due to visceral fat accumulation might be associated with the development of left ventricular diastolic dysfunction in non-diabetic general population without overt cardiovascular disease.
Figure 1
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- T Kamon
- University of Tokyo Hospital, The Department of Cardiovascular Medicine, Tokyo, Japan
| | - H Kaneko
- University of Tokyo Hospital, The Department of Cardiovascular Medicine, Tokyo, Japan
| | - H Itoh
- University of Tokyo Hospital, The Department of Cardiovascular Medicine, Tokyo, Japan
| | - H Kiriyama
- University of Tokyo Hospital, The Department of Cardiovascular Medicine, Tokyo, Japan
| | - K Koyama
- University of Tokyo Hospital, The Department of Computational Radiology and Preventive Medicine, Tokyo, Japan
| | - K Fujiu
- University of Tokyo Hospital, The Department of Cardiovascular Medicine, Tokyo, Japan
| | - H Morita
- University of Tokyo Hospital, The Department of Cardiovascular Medicine, Tokyo, Japan
| | - K Uno
- University of Tokyo Hospital, The Department of Computational Radiology and Preventive Medicine, Tokyo, Japan
| | - N Hayashi
- University of Tokyo Hospital, The Department of Computational Radiology and Preventive Medicine, Tokyo, Japan
| | - I Komuro
- University of Tokyo Hospital, The Department of Cardiovascular Medicine, Tokyo, Japan
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Matsuoka N, Yamaguchi M, Asai A, Kamiya K, Kinashi H, Katsuno T, Kobayashi T, Tamai H, Morinaga T, Obayashi T, Nakabayashi K, Koide S, Nakanishi M, Koyama K, Suzuki Y, Ishimoto T, Mizuno M, Ito Y. The effectiveness and safety of computed tomographic peritoneography and video-assisted thoracic surgery for hydrothorax in peritoneal dialysis patients: A retrospective cohort study in Japan. PLoS One 2020; 15:e0238602. [PMID: 32881941 PMCID: PMC7470296 DOI: 10.1371/journal.pone.0238602] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 08/19/2020] [Indexed: 11/19/2022] Open
Abstract
Introduction Albeit uncommon, hydrothorax is an important complication of peritoneal dialysis (PD). Due to paucity of evidence for optimal treatment, this study aimed to evaluate the effectiveness and safety of computed tomographic (CT) peritoneography and surgical intervention involving video-assisted thoracic surgery (VATS) for hydrothorax in a retrospective cohort of patients who underwent PD in Japan. Methods Of the 982 patients who underwent PD from six centers in Japan between 2007 and 2019, 25 (2.5%) with diagnosed hydrothorax were enrolled in this study. PD withdrawal rates were compared between patients who underwent VATS for diaphragm repair (surgical group) and those who did not (non-surgical group) using the Kaplan-Meier method and log-rank test. Results The surgical and non-surgical groups comprised a total of 11 (44%) and 14 (56%) patients, respectively. Following hydrothorax diagnosis by thoracentesis and detection of penetrated sites on the diaphragm using CT peritoneography, VATS was performed at a median time of 31 days (interquartile range [IQR], 20–96 days). During follow-up (median, 26 months; IQR, 10–51 months), 9 (64.3%) and 2 (18.2%) patients in the non-surgical and surgical groups, respectively, withdrew from PD (P = 0.021). There were no surgery-related complications or hydrothorax relapse in the surgical group. Conclusions This study demonstrated the effectiveness and safety of CT peritoneography and VATS for hydrothorax. This approach may be useful in hydrothorax cases to avoid early drop out of PD and continue PD in the long term. Further studies are warranted to confirm these results.
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Affiliation(s)
- Naoya Matsuoka
- Department of Nephrology and Rheumatology, Aichi Medical University, Nagakute, Japan
- Department of Renal Transplant Surgery, Aichi Medical University, Nagakute, Japan
| | - Makoto Yamaguchi
- Department of Nephrology and Rheumatology, Aichi Medical University, Nagakute, Japan
| | - Akimasa Asai
- Department of Nephrology and Rheumatology, Aichi Medical University, Nagakute, Japan
| | - Keisuke Kamiya
- Department of Nephrology and Rheumatology, Aichi Medical University, Nagakute, Japan
| | - Hiroshi Kinashi
- Department of Nephrology and Rheumatology, Aichi Medical University, Nagakute, Japan
| | - Takayuki Katsuno
- Department of Nephrology and Rheumatology, Aichi Medical University, Nagakute, Japan
| | - Takaaki Kobayashi
- Department of Renal Transplant Surgery, Aichi Medical University, Nagakute, Japan
| | - Hirofumi Tamai
- Department of Nephrology, Anjo-Kosei Hospital, Anjo, Japan
| | | | - Takaaki Obayashi
- Department of Nephrology, Narita Memorial Hospital, Toyohashi, Japan
| | | | - Shigehisa Koide
- Department of Nephrology, Fujita Health University School of Medicine, Toyoake, Japan
| | - Michimasa Nakanishi
- Department of Nephrology, Fujita Health University School of Medicine, Toyoake, Japan
| | - Katsushi Koyama
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Japan
| | - Yasuhiro Suzuki
- Department of Nephrology and Renal Replacement Therapy, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Takuji Ishimoto
- Department of Nephrology and Renal Replacement Therapy, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Masashi Mizuno
- Department of Nephrology and Renal Replacement Therapy, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yasuhiko Ito
- Department of Nephrology and Rheumatology, Aichi Medical University, Nagakute, Japan
- * E-mail:
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9
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Tanaka Y, Koyama K, Horiuchi N, Watanabe K, Kobayashi Y. Relationship between Histological Grade and Histopathological Appearance in Canine Mammary Carcinomas. J Comp Pathol 2020; 179:59-64. [PMID: 32958149 DOI: 10.1016/j.jcpa.2020.07.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 06/15/2020] [Accepted: 07/14/2020] [Indexed: 10/23/2022]
Abstract
Canine mammary carcinomas are common tumours in female dogs and histopathological examination has an important role in identifying whether they are benign or malignant. The latest and most commonly used histological grading system was established by Peña et al. (2013) and is based on the extent of tubule formation, nuclear pleomorphism and number of mitoses. Before the establishment of this grading system, tumour size and classical histological indicators of malignancy such as lymphovascular invasion, infiltration into surrounding tissue, necrosis and presence of a micropapillary pattern were important predictors of biological behaviour. However, the system of Peña et al. does not consider tumour size or these histological features. Clarifying the association of these features and histological grade, especially in grade II and III carcinomas, is important. In this study, we confirmed that the system of Peña et al. is effective for predicting biological behaviour and that evaluation of histological features of malignancy reinforced histological grade, as determined by the system of Peña et al., especially in grade II carcinomas.
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Affiliation(s)
- Y Tanaka
- Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido, Japan
| | - K Koyama
- Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido, Japan
| | - N Horiuchi
- Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido, Japan
| | - K Watanabe
- Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido, Japan
| | - Y Kobayashi
- Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido, Japan.
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10
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Watanabe S, Matsumoto N, Koshio J, Ishida A, Tanaka T, Abe T, Ishikawa D, Shoji S, Nozaki K, Ichikawa K, Kondo R, Otsubo A, Aoki A, Kajiwara T, Koyama K, Miura S, Yoshizawa H, Kikuchi T. MA21.05 Phase II Trial of the Combination of Alectinib with Bevacizumab in ALK-Positive Nonsquamous Non-Small Cell Lung Cancer. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.676] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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Nishi E, Satou T, Sukumaran SK, Katou T, Sugimoto M, Koyama K. Rheology and Foaming of Long-Chain Branched Ethylene-Tetrafluoroethylene Copolymer and Its Blends. INT POLYM PROC 2018. [DOI: 10.3139/217.3468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The long-chain branched ethylene-tetrafluoroethylene copolymer (B-ETFE) was synthesized by radical polymerization using ethylene, tetrafluoroethylene, termonomer, and a very small amount of divinyl monomer. We studied melt rheology under shear and elongational flow, and foamability for B-ETFE, comparing with conventional linear ETFE. Addition of a small amount of the divinyl monomer had a considerable impact on the melt rheology of ETFE and its blends. The observed non-linear elongational behavior and emergence of long relaxation time components can be explained by long-chain branching in the modified ETFE. B-ETFE and its blends showed excellent foaming processability: uniform and smaller cell sizes and much higher cell number densities than those of linear ETFE. To the best of our knowledge, this is the first report of the enhancement of the melt rheology of ETFE from the viewpoint of modification of its molecular architecture.
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Affiliation(s)
- E. Nishi
- Research and Development Division , Asahi Glass Co., Ltd., Ichihara, Chiba , Japan
| | - T. Satou
- Research and Development Division , Asahi Glass Co., Ltd., Ichihara, Chiba , Japan
| | - S. K. Sukumaran
- Graduate School of Organic Materials Science , Yamagata University, Yonezawa , Japan
| | - T. Katou
- Graduate School of Organic Materials Science , Yamagata University, Yonezawa , Japan
| | - M. Sugimoto
- Graduate School of Organic Materials Science , Yamagata University, Yonezawa , Japan
| | - K. Koyama
- Graduate School of Organic Materials Science , Yamagata University, Yonezawa , Japan
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12
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Hibi A, Mizuguchi K, Yoneyama A, Kasugai T, Kamiya K, Kamiya K, Ito C, Kominato S, Miura T, Koyama K. Severe refractory TAFRO syndrome requiring continuous renal replacement therapy complicated with Trichosporon asahii infection in the lungs and myocardial infarction: an autopsy case report and literature review. Ren Replace Ther 2018; 4:16. [PMID: 34171004 PMCID: PMC7149248 DOI: 10.1186/s41100-018-0157-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 02/22/2018] [Indexed: 01/09/2023] Open
Abstract
Background TAFRO (thrombocytopenia, anasarca, fever, reticulin myelofibrosis/renal failure, and organomegaly) syndrome is a systemic inflammatory disorder and unique clinicopathological variant of idiopathic multicentric Castleman disease that was proposed in Japan. Prompt diagnosis is critical because TAFRO syndrome is a progressive and life threating disease. Some cases are refractory to immunosuppressive treatments. Renal impairment is frequently observed in patients with TAFRO syndrome, and some severe cases require hemodialysis. Histological evaluation is important to understand the pathophysiology of TAFRO syndrome. However, systemic histopathological evaluation through autopsy in TAFRO syndrome has been rarely reported previously. Case presentation A 46-year-old Japanese man with chief complaints of fever and abdominal distension was diagnosed with TAFRO syndrome through imaging studies, laboratory findings, and pathological findings on cervical lymph node and bone marrow biopsies. Interleukin (IL)-6 and vascular endothelial growth factor (VEGF) levels were remarkably elevated in both blood and ascites. Methylprednisolone (mPSL) pulse therapy was initiated on day 10, followed by combination therapy with PSL and cyclosporine A. However, the amount of ascites did not respond to the treatment. The patient became anuric, and continuous renal replacement therapy was initiated from day 50. However, the patient suddenly experienced cardiac arrest associated with myocardial infarction (MI) on the same day. Although the emergent percutaneous coronary intervention was successfully performed, the patient died on day 52, despite intensive care. Autopsy was performed to ascertain the cause of MI and to identify the histopathological characteristics of TAFRO syndrome. Conclusions Bacterial peritonitis, systemic cytomegalovirus infection, and Trichosporon asahii infection in the lungs were observed on autopsy. In addition, sepsis-related myocardial calcification was suspected. Management of infectious diseases is critical to reduce mortality in patients with TAFRO syndrome. Although the exact cause of MI could not be identified on autopsy, we considered embolization by fungal hyphae as a possible cause. Endothelial injury possibly caused by excessive secretion of IL-6 and VEGF contributed to renal impairment. Fibrotic changes in anterior mediastinal fat tissue could be a characteristic pathological finding in patients with TAFRO syndrome.
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Affiliation(s)
- Arata Hibi
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi 448-8505 Japan
| | - Ken Mizuguchi
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi 448-8505 Japan
| | - Akiko Yoneyama
- Deaprtment of Pathology, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi 448-8505 Japan
| | - Takahisa Kasugai
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi 448-8505 Japan
| | - Keisuke Kamiya
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi 448-8505 Japan
| | - Keisuke Kamiya
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Aichi Medical University Hospital, 1-1 Yazakokarimata, Nagakute, Aichi 480-1195 Japan
| | - Chiharu Ito
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi 448-8505 Japan
| | - Satoru Kominato
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi 448-8505 Japan
| | - Toshiyuki Miura
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi 448-8505 Japan
| | - Katsushi Koyama
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi 448-8505 Japan
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13
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Hibi A, Kasugai T, Kamiya K, Ito C, Kominato S, Miura T, Koyama K. Exit Site Infection due to Mycobacterium chelonae in an Elderly Patient on Peritoneal Dialysis. Case Rep Nephrol Dial 2018; 8:1-9. [PMID: 29594145 PMCID: PMC5836155 DOI: 10.1159/000486159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Accepted: 12/06/2017] [Indexed: 11/23/2022] Open
Abstract
Nontuberculous mycobacteria (NTM) are rarely isolated from peritoneal dialysis (PD)-associated catheter infections. However, NTM infection is usually difficult to treat and leads to catheter loss. Prompt diagnosis is essential for appropriate treatment. A 70-year-old Japanese man who had been on PD for 2 years and with a medical history of 2 episodes of exit site infections (ESIs) due to methicillin-resistant Staphylococcus aureus was admitted to the hospital due to suspected ESI recurrence. However, Gram staining of the pus revealed no gram-positive cocci. Instead, weakly stained gram-positive rods were observed after 7 days of incubation, which were also positive for acid-fast staining. Rapidly growing NTM Mycobacterium chelonae was isolated on day 14. Despite administering a combination antibiotic therapy, ESI could not be controlled, and catheter removal surgery was performed on day 21. Although PD was discontinued temporarily, the patient did not require hemodialysis, without any uremic symptoms. The catheter was reinserted on day 48, and PD was reinitiated on day 61. The patient was discharged on day 65. Antibiotic therapy was continued for 3 months after discharge, with no indications of recurrent infections observed. It is important to consider the risk of NTM infections in patients on PD. Acid-fast staining could be a key test for prompt diagnosis and provision of an appropriate treatment.
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Affiliation(s)
- Arata Hibi
- aDivision of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Japan
| | - Takahisa Kasugai
- aDivision of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Japan
| | - Keisuke Kamiya
- aDivision of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Japan.,bDivision of Nephrology and Rheumatology, Department of Internal Medicine, Aichi Medical University Hospital, Nagakute, Japan
| | - Chiharu Ito
- aDivision of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Japan
| | - Satoru Kominato
- aDivision of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Japan
| | - Toshiyuki Miura
- aDivision of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Japan
| | - Katsushi Koyama
- aDivision of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Japan
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Hibi A, Kasugai T, Kamiya K, Kamiya K, Kominato S, Ito C, Miura T, Koyama K. Successful Recovery from Spontaneous Spinal Epidural Hematoma in a Patient Undergoing Hemodialysis. Am J Case Rep 2017; 18:1357-1364. [PMID: 29259148 PMCID: PMC5745891 DOI: 10.12659/ajcr.905953] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Patient: Male, 70 Final Diagnosis: Spontaneous spinal epidural hematoma Symptoms: Abdominal pain • chest pain • complete paraplegia Medication: — Clinical Procedure: Conservative management Specialty: Nephrology
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Affiliation(s)
- Arata Hibi
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Aichi, Japan
| | - Takahisa Kasugai
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Aichi, Japan
| | - Keisuke Kamiya
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Aichi, Japan
| | - Keisuke Kamiya
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Aichi Medical University Hospital, Nagakute, Aichi, Japan
| | - Satoru Kominato
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Aichii, Japan
| | - Chiharu Ito
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Aichi, Japan
| | - Toshiyuki Miura
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Aichi, Japan
| | - Katsushi Koyama
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, Kariya, Aichi, Japan
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Hiratsuka M, Koyama K, Sengo K, Yamamoto J, Narita A, Ito C, Kominato S, Hibi A, Kamiya K, Miyahara R, Fujikawa J, Miura T. Long-term iron accumulation in dialysis patients treated with ferric citrate hydrate: a single-center, 80-week retrospective study in Japan. Ren Replace Ther 2017. [DOI: 10.1186/s41100-017-0118-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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16
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Hibi A, Kuga Y, Ito C, Miura T, Kominato S, Kamiya K, Kamiya K, Kasugai T, Koyama K. Severe hypoglycemia during pneumocystis pneumonia treatment associated with trimethoprim–sulfamethoxazole use in a patient on peritoneal dialysis. Ren Replace Ther 2017. [DOI: 10.1186/s41100-017-0125-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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17
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Koyama K, Horiuchi N, Hasegawa H, Katano H, Oohashi E, Watanabe K, Kobayashi Y. Cytomegalic Inclusion Disease caused by Cytomegalovirus Infection in the Salivary Glands of an African Hedgehog (Atelerix arbiventris). J Comp Pathol 2017; 157:299-302. [PMID: 29169627 DOI: 10.1016/j.jcpa.2017.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 09/19/2017] [Accepted: 09/29/2017] [Indexed: 10/18/2022]
Abstract
Cytomegalic inclusion disease (CID) in the salivary gland of African hedgehogs (Atelerix arbiventris) has been reported before, and is suspected to reflect a cytomegalovirus infection. However, a recent ultrastructural study reported that African hedgehog CID reflected oncocytic metaplasia, mimicking a cytomegalovirus infection. We examined the submandibular and sublingual salivary glands of a 1-year-old male African hedgehog. Histologically, there were multiple foci composed of cytomegalic cells with intranuclear inclusion bodies. Ultrastructurally, viral particles (109-118 nm in diameter) were observed in the nuclei of the cytomegalic cells. There were numerous vesicles containing various numbers of enveloped viruses in the cytoplasm. We also attempted to detect viral DNA fragments by degenerate polymerase chain reaction and obtained amplicons of a predicted size. Phylogenetic analysis indicated that the virus is a betaherpesvirus, comparatively related to human and rodent cytomegaloviruses. The present study suggested that African hedgehog CIDs also include those caused by the cytomegalovirus.
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Affiliation(s)
- K Koyama
- Laboratory of Veterinary Pathology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan; The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
| | - N Horiuchi
- Laboratory of Veterinary Pathology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
| | - H Hasegawa
- Department of Pathology, National Institute of Infectious Diseases, Shinjuku, Japan
| | - H Katano
- Department of Pathology, National Institute of Infectious Diseases, Shinjuku, Japan
| | - E Oohashi
- Akashiya Animal Hospital, Obihiro, Japan
| | - K Watanabe
- Laboratory of Veterinary Pathology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
| | - Y Kobayashi
- Laboratory of Veterinary Pathology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan.
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18
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Koyama K, Saida Y, Abe T, Satokata M, Mishina Y, Sato K, Shoji S, Tanaka T, Nozaki K, Ichikawa K, Miyabayashi T, Ota T, Fujimori F, Ito R, Kondo R, Hiura T, Okajima M, Miura S, Watanabe S, Matsumoto N, Tanaka H, Kikuchi T. P2.03-015 Efficacy of EGFR-TKIs for EGFR Mutant NSCLC Patients with Central Nervous System Metastases: A Retrospective Analysis. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Ozaki K, Doi H, Mitsui J, Sato N, Yamane K, Majima T, Irioka T, Ishiura H, Doi K, Morishita S, Koyama K, Miura Y, Matsumoto N, Tanaka F, Tsuji S, Mizusawa H, Yokota T, Ishikawa K. Clinicoradiological characteristics of SCA34 patients with the hot cross bun sign caused by the P.TRP246GLY mutation in ELOVL4. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Hibi A, Kamiya K, Kasugai T, Kamiya K, Kominato S, Ito C, Miura T, Koyama K. Acute kidney injury caused by decompression illness successfully treated with hyperbaric oxygen therapy and temporary dialysis. CEN Case Rep 2017; 6:200-205. [PMID: 28900861 DOI: 10.1007/s13730-017-0275-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 09/08/2017] [Indexed: 11/30/2022] Open
Abstract
A 52-year-old Japanese male professional diver was referred to our hospital for decompression illness (DCI). After 1 h of diving operation at 20 m below sea level, he complained of dyspnea, chest pain, and abdominal pain. He dove again, intending to ease the symptoms, but the symptoms were never relieved. He dove for a total of 4 h. No neurological abnormalities were observed. Computed tomography images revealed portal venous gas and mesenteric venous gas, in addition to bubbles in the femoral veins, pelvis, lumbar canal, intracranial sinuses, and joints. Hyperbaric oxygen therapy (HBOT) was immediately administered. His symptoms improved after the first course of HBOT, however, the patient had anuria for almost 36 h after admission and exhibited acute kidney injury (AKI). Serum creatinine and creatine kinase (CK) levels were increased to maximal values of 6.16 mg/dL and 18,963 U/L, respectively. Blood flow signals were not detected on kidney Doppler ultrasound. We considered that AKI was caused by blood flow impairment and capillary leak syndrome due to DCI in addition to rhabdomyolysis secondary to arterial gas embolism in the skeletal muscles. Temporary dialysis was required to correct the acidemia and electrolyte disturbance. Diuretic phase was initiated, and the patient was put off dialysis on day 3. Serum creatinine and CK levels returned to normal on day 11. He was successfully treated without any complications. Although AKI is a rare manifestation, we should consider AKI risk in patients with severe DCI.
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Affiliation(s)
- Arata Hibi
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan.
| | - Keisuke Kamiya
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan
| | - Takahisa Kasugai
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan
| | - Keisuke Kamiya
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Aichi Medical University Hospital, 1-1 Yazakokarimata, Nagakute, Aichi, 480-1195, Japan
| | - Satoru Kominato
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan
| | - Chiharu Ito
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan
| | - Toshiyuki Miura
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan
| | - Katsushi Koyama
- Division of Nephrology and Rheumatology, Department of Internal Medicine, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan
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21
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Soma K, Takeda N, Isagawa T, Abe H, Semba H, Koyama K, Wake M, Kato M, Nakagama Y, Manabe I, Nagai R, Komuro I. 3852Flt-1 in M1 macrophages promotes immature vascular formation. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.3852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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22
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Koyama K, Takeda N, Abe H, Semba H, Soma K, Wake M, Katoh M, Nakagama Y, Isagawa T, Komuro I. 5043Unbiased shRNA screening identifies that lactic acid promotes cardiac fibroblast activation. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.5043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Vathulya M, Chattopadhyay D, Koyama K. Olympic torch flap: one-stop option for simultaneous brow, upper and lower lid reconstruction in post burn patients. Ann Burns Fire Disasters 2017; 30:143-145. [PMID: 29021728 PMCID: PMC5627553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 06/11/2017] [Indexed: 06/07/2023]
Abstract
Facial units reconstruction in a post burn patient poses tough challenges. Simultaneous brow and lid reconstruction is one of them. This article presents a 45-year-old epileptic male with burn of complete face. The task of reconstructing the brow, upper and lower lids was successfully accomplished using a modification of the Guyuron postauricular fasciocutaneous flap, after initial grafting and radial forearm flap reconstruction of forehead and other parts of the face. The article gives a single-stop solution for simultaneous reconstruction of brow and lids using a random pattern extension of the traditional postauricular flap, thus proving the excellent vascularity and hence durability of the flap in spite of a 180 degrees change in the orientation of the flap with respect to the axis.
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Affiliation(s)
- M. Vathulya
- Department of Burns and Plastic Surgery, All India Institute of Medical Sciences, Rishikesh, India
| | - D. Chattopadhyay
- Department of Burns and Plastic Surgery, All India Institute of Medical Sciences, Rishikesh, India
| | - K. Koyama
- Department of Cranio-Maxillofacial Surgery, Maastricht University Medical Center, Maastricht, The Netherlands
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24
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Nakamura K, Naito S, Sasaki T, Take Y, Kitagawa Y, Otsuka Y, Motoda H, Yamashita E, Kumagai K, Tomita Y, Koyama K, Oshima S. P903Post-ablation thromboembolisms in patients undergoing balloon-based ablation of atrial fibrillation and receiving direct oral anticoagulants: a comparison between cryoballoon and hotballoon ablation. Europace 2017. [DOI: 10.1093/ehjci/eux151.085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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25
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Kubo Y, Nakazato K, Koyama K, Tahara Y, Funaki A, Hiranuma K. The Relation between Hamstring Strain Injury and Physical Characteristics of Japanese Collegiate Sepak Takraw Players. Int J Sports Med 2016; 37:986-991. [PMID: 27626501 DOI: 10.1055/s-0042-114700] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The aim of this study was to investigate the injuries in Japanese collegiate sepak takraw players. We primarily focused on hamstring strain injury (HSI), and investigated the associated physical characteristics. The study included 77 Japanese collegiate sepak takraw players who were interviewed; data were collected regarding injuries sustained by them during the game within the past year. The hip range of motion (ROM) was measured. The total number of injuries was 48 in a year. The rate of HSI was the highest (31.3%) among all the injuries. All HSIs occurred in the dominant leg because of the sunback spike. Using the Mann-Whitney U test, significant differences in age and sport-related experience were observed between the injured group and uninjured group. Upon using logistic regression analysis, the presence of a HSI was found to be associated with the sport-related experience (adjusted odds ratio [OR], 0.30; 95% confidence interval [CI], 0.12-0.77) and the hip extension ROM (adjusted OR, 0.81; 95% CI, 0.66-0.99) after adjusting for sex, sport-related experience, and the hip ROM. HSI is the most common injury in Japanese collegiate sepak takraw players. Short sport-related experience and small hip extension ROM are related with the occurrence of HSI.
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Affiliation(s)
- Y Kubo
- Graduate School of Health and Sport Science, Nippon Sport Science University, Tokyo, Japan
| | - K Nakazato
- Exercise Physiology, Nippon Sport Science University, Tokyo, Japan
| | - K Koyama
- Department of Judothrapy, Tokyo Ariake University of Medical and Health Sciences, Tokyo, Japan
| | - Y Tahara
- Faculty of Sport Science, Nippon Sport Science University, Tokyo, Japan
| | - A Funaki
- Department of Judo Therapy, Teikyo University of Science, Yamanashi, Japan
| | - K Hiranuma
- Graduate School of Health and Sport Science, Nippon Sport Science University, Tokyo, Japan
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26
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Tan G, Shimada K, Nozawa Y, Kaneko S, Urakami T, Koyama K, Komura M, Matsuda A, Yoshimoto M. Atomic step-and-terrace surface of polyimide sheet for advanced polymer substrate engineering. Nanotechnology 2016; 27:295603. [PMID: 27284690 DOI: 10.1088/0957-4484/27/29/295603] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Typical thermostable and flexible polyimide polymers exhibit many excellent properties such as strong mechanical and chemical resistance. However, in contrast to single-crystal substrates like silicon or sapphire, polymers mostly display disordered and rough surfaces, which may result in instability and degradation of the interfaces between thin films and polymer substrates. As a step toward the development of next-generation polymer substrates, we here report single-atom-layer imprinting onto the polyimide sheets, resulting in an ultrasmooth 0.3 nm high atomic step-and-terrace surface on the polyimides. The ultrasmooth polymer substrates are expected to be applied to the fabrication of nanostructures such as superlattices, nanowires, or quantum dots in nanoscale-controlled electronic devices. We fabricate smooth and atomically stepped indium tin oxide transparent conducting oxide thin films on the imprinted polyimide sheets for future use in organic-based optoelectronic devices processed with nanoscale precision. Furthermore, toward 2D polymer substrate nanoengineering, we demonstrate nanoscale letter writing on the atomic step-and-terrace polyimide surface via atomic force microscopy probe scratching.
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Affiliation(s)
- G Tan
- Department of Innovative & Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Japan
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27
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Mfungwe V, Ota M, Koyama K, Samungole GKV, Takemura Y, Hirao S, Mwamba Q. 'Transfer out' tuberculosis patients: treatment outcomes after cross-checking registers, 2012-2013, Lusaka, Zambia. Public Health Action 2016; 6:118-21. [PMID: 27358805 DOI: 10.5588/pha.16.0016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Accepted: 04/20/2016] [Indexed: 11/10/2022] Open
Abstract
SETTING Lusaka, Zambia. OBJECTIVE To assess the actual treatment outcomes of 'transfer out' (TO) cases at a diagnostic centre in Lusaka, in the third and fourth quarters of 2012, and to see the impact of this cross-check in treatment success rates (TSR) in 2013 and early 2014. DESIGN AND METHOD In this retrospective cohort study, treatment outcomes for new bacteriologically positive tuberculosis (TB) cases referred from the diagnostic centre were reviewed and compared with those at the receiving treatment units. RESULTS Of 49 (58%) cases referred to three treatment units, the treatment outcomes of nine had to be updated at the diagnostic centre, which reduced the proportion of TO cases from 17.6% to 11.8% and increased the TSR to 70.6% from 64.7%. CONCLUSION The review and cross-checking of the TB registers at the diagnostic and treatment units led to a significant reduction in non-assessed cases, suggesting that the TB registers in the diagnostic and treatment units should be cross-checked regularly. There is also need for a complementary intervention to reduce the proportion of TOs associated with high loss to follow-up and non-evaluated TO rates.
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Affiliation(s)
- V Mfungwe
- Japan Anti-Tuberculosis Association-Zambia, Lusaka, Zambia
| | - M Ota
- Japan Anti-Tuberculosis Association-Zambia, Lusaka, Zambia
| | - K Koyama
- Japan Anti-Tuberculosis Association-Zambia, Lusaka, Zambia
| | | | - Y Takemura
- Japan Anti-Tuberculosis Association-Zambia, Lusaka, Zambia
| | - S Hirao
- Japan Anti-Tuberculosis Association-Zambia, Lusaka, Zambia
| | - Q Mwamba
- Lusaka District Community Health Office, Lusaka, Zambia
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Mizuguchi K, Sasakawa Y, Kimura T, Ogawa A, Ito C, Mizuno M, Koyama K. MP498RELATIONSHIP BETWEEN DECLINE OF RENAL FUNCTION AND HYPORESPONSIVENESS TO ERYTHROPOIESIS-STIMULATING AGENTS IN PERITONEAL DIALYSIS. Nephrol Dial Transplant 2016. [DOI: 10.1093/ndt/gfw195.14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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29
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Hiratsuka M, Koyama K, Yamamoto J, Narita A, Sasakawa Y, Shimogushi H, Ogawa A, Kimura T, Mizuguchi K, Mizuno M. Skin Perfusion Pressure and the Prevalence of Atherothrombosis in Hemodialysis Patients. Ther Apher Dial 2015; 20:40-5. [PMID: 26482119 DOI: 10.1111/1744-9987.12327] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
End-stage renal disease is associated with atherothrombosis (ATIS), which, in turn, can promote peripheral arterial occlusive disease (PAOD), coronary artery disease (CAD), and/or cerebrovascular disease (CVD). The aim of this study was to determine whether low plantar skin perfusion pressure (SPP) was related to ATIS among 122 patients receiving maintenance hemodialysis (HD) from March to November 2013 at our outpatient facility. We routinely measured SPP and used the value for analysis. In addition, we retrospectively evaluated the prevalence of ATIS with patients categorized to CAD, CVD, or PAOD groups. Of the 122 outpatients, ATIS was diagnosed in about half (N = 60, 49.2% vs. 62, 50.8%; average SPP, 56.6 vs. 72.9 mm Hg, respectively). These data show that SPP was significantly lower in patients with ATIS (difference, 16.3 mm Hg; P < 0.001) and there was a negative relationship between average SPPs and past history of ATIS complications. When the patients were stratified by the presence of diabetes mellitus, this trend was stronger. Particularly, receiver operating characteristic analysis of HD patients with diabetes revealed a cutoff point of 53.0 mm Hg and an area under the curve value of 0.84, with a sensitivity of 77.0% and specificity of 91.3%. Therefore, we concluded that SPP enables the evaluation of not only local PAOD, but also systemic ATIS. Moreover, we found that a cutoff point of 53.0 mm Hg was useful for detection of ATIS in HD patients.
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Affiliation(s)
- Maki Hiratsuka
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Katsushi Koyama
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Jun Yamamoto
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Aiko Narita
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Yuji Sasakawa
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Hiroya Shimogushi
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Atsushi Ogawa
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Tomomi Kimura
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Ken Mizuguchi
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
| | - Masashi Mizuno
- Department of Nephrology, Kariya Toyota General Hospital, Aichi, Japan
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30
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Bonisoli-Alquati A, Koyama K, Tedeschi DJ, Kitamura W, Sukuzi H, Ostermiller S, Arai E, Møller AP, Mousseau TA. Abundance and genetic damage of barn swallows from Fukushima. Sci Rep 2015; 5:9432. [PMID: 25838205 PMCID: PMC5381690 DOI: 10.1038/srep09432] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 02/05/2015] [Indexed: 11/09/2022] Open
Abstract
A number of studies have assessed or modeled the distribution of the radionuclides released by the accident at the Fukushima-Daiichi Nuclear Power Plant (FDNPP). Few studies however have investigated its consequences for the local biota. We tested whether exposure of barn swallow (Hirundo rustica) nestlings to low dose ionizing radiation increased genetic damage to their peripheral erythrocytes. We estimated external radiation exposure by using thermoluminescent dosimeters, and by measuring radioactivity of the nest material. We then assessed DNA damage by means of the neutral comet assay. In addition, we conducted standard point-count censuses of barn swallows across environmental radiation levels, and estimated their abundance and local age ratio. Radioactivity of nest samples was in the range 479-143,349 Bq kg(-1), while external exposure varied between 0.15 and 4.9 mGy. Exposure to radioactive contamination did not correlate with higher genetic damage in nestlings. However, at higher levels of radioactive contamination the number of barn swallows declined and the fraction of juveniles decreased, indicating lower survival and lower reproduction and/or fledging rate. Thus, genetic damage to nestlings does not explain the decline of barn swallows in contaminated areas, and a proximate mechanism for the demographic effects documented here remains to be clarified.
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Affiliation(s)
- A Bonisoli-Alquati
- Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA
| | - K Koyama
- Japan Bird Research Association, Fuchu, Tokyo, Japan
| | - D J Tedeschi
- Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208, USA
| | - W Kitamura
- Faculty of Environmental Studies, Tokyo City University, Yokohama City, Japan
| | - H Sukuzi
- Value Frontier Co., Ltd., Minato, Tokyo, Japan
| | - S Ostermiller
- Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA
| | - E Arai
- Division of Ecology and Evolutionary Biology, Graduate School of Life Sciences, Tohoku University, Sendai, Japan
| | - A P Møller
- Laboratoire d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, Bâtiment 362, F-91405 Orsay Cedex, France
| | - T A Mousseau
- Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA
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31
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Affiliation(s)
- J. Yamauchi
- Graduate School of Human Health Sciences, Tokyo Metropolitan, University, Tokyo, Japan
| | - K. Koyama
- Graduate School of Human Health Sciences, Tokyo Metropolitan, University, Tokyo, Japan
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Koyama K, Ohba T, Haro H, Nakao A. Positive association between serum thymic stromal lymphopoietin and anti-citrullinated peptide antibodies in patients with rheumatoid arthritis. Clin Exp Immunol 2015; 181:239-43. [PMID: 25817699 DOI: 10.1111/cei.12632] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 03/18/2015] [Accepted: 03/23/2015] [Indexed: 01/11/2023] Open
Abstract
Thymic stromal lymphopoietin (TSLP) has been suggested recently to play an important role in the pathophysiology of rheumatoid arthritis (RA). However, there is little information on serum TSLP concentrations in RA and its clinical significance. The present study investigated whether serum TSLP concentrations were affected in patients with RA. Using an enzyme-linked immunosorbent assay (ELISA), we measured TSLP concentrations in the serum obtained from 100 patients with RA, 60 patients with osteoarthritis (OA) and 34 healthy volunteers. We also investigated the correlation between serum TSLP concentrations and clinical parameters of disease activity in RA [disease activity score using 28 joint counts (DAS28)-C-reactive protein (CRP), DAS28-erythrocyte sedimentation rate (ESR), Clinical Disease Activity Index (CDAI]), patient's/-physician's Visual Analogue Scale (VAS), swollen joints count, tender joints count, CRP, ESR and matrix metalloproteinase-3 (MMP-3) concentrations]. In addition, we investigated the correlation between serum TSLP concentrations and anti-citrullinated peptide antibody (ACPA) and serum tumour necrosis factor (TNF)-α. Serum TSLP levels in patients with RA were significantly higher than those in patients with OA and in healthy volunteers. Interestingly, serum TSLP concentrations were correlated significantly with ACPA titres, but not with other clinical parameters. There was a significant increase in serum TSLP concentrations in patients with RA, which was correlated positively with serum ACPA titres. These findings suggest that in patients with RA, TSLP may play a role in ACPA production by B cells.
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Affiliation(s)
- K Koyama
- Department of Orthopaedic Surgery
| | - T Ohba
- Department of Orthopaedic Surgery
| | - H Haro
- Department of Orthopaedic Surgery
| | - A Nakao
- Department of Immunology, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
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Hassan MM, Koyama K. Enhanced thermal, mechanical and fire-retarding properties of polystyrene sulphonate-grafted-nanosilica/polypropylene composites. RSC Adv 2015. [DOI: 10.1039/c4ra15750h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The addition of pSS-grafted-nanosilica to PP showed enhanced fire retardancy as assessed by mass loss, cone calorimetry and LOI measurements.
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Affiliation(s)
- M. M. Hassan
- Venture Business Laboratory
- Yamagata University
- Yonezawa
- Japan
- Food & Biobased Products Group
| | - K. Koyama
- Venture Business Laboratory
- Yamagata University
- Yonezawa
- Japan
- Department of Polymer Science and Engineering
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34
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Koyama K, Matsuda K, Haro H. AB0071 A Possible Role of Serum IL-6 Quick Measure System in RA Patients. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.2017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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35
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Toyama K, Furuie H, Koyama K, Nakai D, Ishizuka H. OC019—Intrapulmonary Pharmacokinetics (Pk) And The Intracellular Disposition To Support The Long-Lasting Efficacy After An Inhaled Administration Of Its Prodrug Laninamivir Octanoate (Lo). Clin Ther 2013. [DOI: 10.1016/j.clinthera.2013.07.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Abstract
Abstract
It is often observed in industrial practice that the thickness uniformity of blown film obtained with a given die varies with the type of polymer. We have shown in previous works the importance of the wall slip of polymer melt in the film uniformity. Currently available models of polymer melt flow through spiral mandrel dies neglect the wall slip. The present work considers the slip in flow analyses and predicts the effects of rheological properties on the uniformity; the decreases in melt viscosity and wall slip and the increases in shear thinning and the stress dependence of wall slip reduce the uniformity. The predictions agree well with the experimental results obtained in our previous studies.
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Affiliation(s)
- H. Higuchi
- Materials & Chemicals Research Laboratory, Research & Development Center, Idemitsu Petrochemical Co., Ltd., Chiba, Japan
| | - K. Koyama
- Department of Materials Science & Engineering, Faculty of Engineering, Yamagata University, Yamagata, Japan
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Abstract
Abstract
We studied in detail the effects of pressure and shear stress on the crystallization behaviors during injection molding process. Crystallization of isotactic-polypropylene (iPP) was simulated for various injection flow rates. The crystallization started during the filling stage under long filling condition. Moreover, the crystallization in some layers showed two -step growth behavior, while in other layers the crystallization does not progress during the packing -cooling stage. Since pressure becomes very high during molding process under long filling time condition, the change of pressure is the most important factor governing the crystallization.
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Affiliation(s)
- H. Ito
- Department of Material and Biological Engineering, Tsuruoka National College of Technology, Tsuruoka, Japan
| | - K. Minagawa
- Department of Chemical Science and Technology, The University of Tokushima, Tokushima, Japan
| | - J. Takimoto
- Department of Materials Science and Engineering, Yamagata University, Yonezawa, Japan
| | - K. Tada
- Plamedia Research Corporation, Tokyo, Japan
| | - K. Koyama
- Department of Materials Science and Engineering, Yamagata University, Yonezawa, Japan
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Abstract
Abstract
In this study, extrusion blow molding processability of polypropylene/polyethylene (PP/PE) blends was related to their viscoelastic behavior and morphology under shear flow. The propylene block-copolymer (PP-B) and blends comprising the PP-B and the linear low-density polyethylene (PE), weight fraction of the PE (ϕPE) was up to 20 wt.%, were mainly used for this study. Viscoelastic behavior under shear flow and swelling ratio of the extruded strands were measured by using a capillary type rheometer. Morphology of the strands was observed by TEM. In case of the PP-B, swelling ratio highly depended on shear rate. Coarse aggregated droplets were observed irrespective of shear rate under the measurement. The droplets were ethylene-propylene copolymers (EP) included in the PP-B aggregated at conversing section of the capillary. However, in case of the PP-B/PE blends, swelling ratio showed lower dependence on shear rate as the ϕPE was higher. When the shear rate was low, large droplets were observed and they were highly deformed in the flow direction. On the other hand, when shear rate was high, the droplets were smaller and showed no deformation in the flow direction because the droplets were broken up due to occurrence of high shear stress. Wall thickness of blow molded bottles produced from the PP-B/PE blends was not affected by the throughput rate. It was proportional to the die-core gap. On the other hand, wall thickness of bottles of the PP-B depended on the throughput rate and it was not proportional to the die-core gap. These results suggest that extrusion blow molding processability of polymer blends is good when the dependence of swelling ratio on shear rate is low.
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Affiliation(s)
| | - K. Koyama
- Department of Polymer Science and Engineering, Yamagata University, Yamagata, Japan
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Higuchi H, Goto H, Koyama K. Effect of Material Species on Flash Generation of PPS/GF Composites. INT POLYM PROC 2013. [DOI: 10.3139/217.1885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Reduction of flash in injection molding is of great concern for manufacturers of electrical parts. In a previous report we have proposed a theoretical model for flash generation. The present study prepares five different poly(phenylene sulfide)/glass fiber composites using three different PPS; linear, branched and crosslinked PPS and measures the length of flash generated in the molding of the composites. Then, we have compared the flash data with a flash parameter defined in the model. This comparison has elucidated that flash length can be related with the flash parameter irrespective of PPS structure, as long as GF content is the same and the clearance of a gas vent is almost identical.
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Affiliation(s)
- H. Higuchi
- Central Research Laboratories, Idemitsu Kosan Co., Ltd., Chiba, Japan
| | - H. Goto
- Plastics Technical Center, Idemitsu Kosan Co., Ltd., Chiba Japan
| | - K. Koyama
- Department of Materials Science & Engineering, Faculty of Engineering, Yamagata University, Yamagata, Japan
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40
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Tsuruoka S, Takeuchi K, Koyama K, Noguchi T, Endo M, Tristan F, Terrones M, Matsumoto H, Saito N, Usui Y, Porter DW, Castranova V. ROS evaluation for a series of CNTs and their derivatives using an ESR method with DMPO. ACTA ACUST UNITED AC 2013; 429. [PMID: 26300949 DOI: 10.1088/1742-6596/429/1/012029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Carbon nanotubes (CNTs) are important materials in advanced industries. It is a concern that pulmonary exposure to CNTs may induce carcinogenic responses. It has been recently reported that CNTs scavenge ROS though non-carbon fibers generate ROS. A comprehensive evaluation of ROS scavenging using various kinds of CNTs has not been demonstrated well. The present work specifically investigates ROS scavenging capabilities with a series of CNTs and their derivatives that were physically treated, and with the number of commercially available CNTs. CNT concentrations were controlled at 0.2 through 0.6 wt%. The ROS scavenging rate was measured by ESR with DMPO. Interestingly, the ROS scavenging rate was not only influenced by physical treatments, but was also dependent on individual manufacturing methods. Ratio of CNTs to DMPO/ hydrogen peroxide is a key parameter to obtain appropriate ROS quenching results for comparison of CNTs. The present results suggest that dangling bonds are not a sole factor for scavenging, and electron transfer on the CNT surface is not clearly determined to be the sole mechanism to explain ROS scavenging.
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Affiliation(s)
- S Tsuruoka
- Shinshu University, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - K Takeuchi
- Shinshu University, Faculty of Engineering, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - K Koyama
- Shinshu University, Faculty of Engineering, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - T Noguchi
- Shinshu University, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - M Endo
- Shinshu University, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - F Tristan
- Shinshu University, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - M Terrones
- Shinshu University, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - H Matsumoto
- Department of Organic and Polymeric Materials Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, JAPAN
| | - N Saito
- Department of Applied Physical Therapy, Shinshu University, School of Health Sciences, 3-1-1 Asahi, Matsumoto, Nagano, Japan
| | - Y Usui
- Shinshu University, Faculty of Engineering, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - D W Porter
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - V Castranova
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
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41
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Aoki Y, Aita M, Mizuochi Y, Kinumura T, Sugimoto M, Takimoto J, Koyama K, Kiritani H, Oomori M, Hirashima A. Paint/Polymer Interface Structure for ABS Injection Moldings. INT POLYM PROC 2013. [DOI: 10.3139/217.2433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Structure of paint/polymer interface was investigated for the injection molded and compression molded ABS specimens. For the interface of the injection molded specimen, a peculiar “zigzag” structure formation of several tens μm in size was observed. In contrast, the interface structure was not observed for the compression molded specimen and injection molded specimen annealed above the glass transition temperature (Tg). These facts indicate that the interface structure is related to the residual stress and molecular orientation at the surface of the injection molding specimen, because both surface structures would be removed by annealing at temperatures above Tg. The interface structure was strongly dependent on the curing agent concentration. The depth of the structure decreased with increasing curing agent concentration because of decreasing in curing time. At painting temperature between 70°C and 130°C, the depth and pitch were constant. However, below 60°C and above 140°C, the depth and pitch were changed. These results strongly suggest that the interface structure is attributable to relaxation of the surface residual stress and molecular orientation by paint soaking.
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Affiliation(s)
- Y. Aoki
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan
| | - M. Aita
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan
| | - Y. Mizuochi
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan
| | - T. Kinumura
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan
| | - M. Sugimoto
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan
| | - J. Takimoto
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan
| | - K. Koyama
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan
| | - H. Kiritani
- Mitsubishi Chemical Gr., Sci. and Tech. Res. Center, Toho-cho, Yokkaichi, Mie, Japan
| | - M. Oomori
- Mitsubishi Chemical Gr., Sci. and Tech. Res. Center, Toho-cho, Yokkaichi, Mie, Japan
| | - A. Hirashima
- Mitsubishi Chemical Gr., Sci. and Tech. Res. Center, Toho-cho, Yokkaichi, Mie, Japan
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Kadomae Y, Amagasa M, Sugimoto M, Taniguchi T, Koyama K. Effect of Electric Current on Beads Formation in Electrospinning of Poly(Vinyl Alcohol). INT POLYM PROC 2013. [DOI: 10.3139/217.2140] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
We investigate effects of electric current on formations of beads in electrospinning by changing an electric conductivity of a poly(vinyl alcohol) (PVA) aqueous solution and spinning conditions, such as applied voltage, distance between a tip of needle and a collector, and relative humidity. From the results of experiments done by changing the conductivity of PVA aqueous solution and spinning conditions, we found that a beads formation is suppressed at a lower electric current. Furthermore, when the electrospinnings are performed at a certain constant electric current in various spinning conditions where the applied voltage and tip-collector distance are changed so as to give the same constant electric current, resultant PVA fibers have no beads and almost the same distribution of fiber diameter.
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Affiliation(s)
- Y. Kadomae
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Japan
| | - M. Amagasa
- Central Research Laboratory, Japan Vilene Company Limited, Ibaraki, Japan
| | - M. Sugimoto
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Japan
| | - T. Taniguchi
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Japan
- Japan Science and Technology Agency, CREST
| | - K. Koyama
- Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Japan
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43
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Uematsu H, Tanoue S, Iemoto Y, Sugimoto M, Taniguchi T, Koyama K. Development of Polymer Extrusion Extruder for Evaluating with a Small Amount of Polymeric Material. INT POLYM PROC 2013. [DOI: 10.3139/217.2559] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
We developed the extrusion system to evaluate the extrusion behavior such as the shear viscosity, which is one of basic properties, and the processability of mono/multilayer film with a small amount of polymeric material. In order to measure the shear viscosity, the gear pump, the return path and the pressure sensors were introduced into the extruder with intermeshing co-rotating twin screws. The viscosity could be evaluated on-line from the volumetric flow rate of molten polymer and the pressure drop in the return path before film processing. The capacity of gear pump, the shape and size of return path were optimized to evaluate the viscosity of polymeric material, which generally undergoes shear rate of 10 ∼ 1000 s−1 in the film processing. The apparatus for mono and multilayer film processing consisted of two extruders including the multichannel feedblock and T-die with the manifold and land section. The compact feedblock was designed to receive two feedstreams, so that the product can have two layers. We investigated the on-line viscosity measurement methodology and the processability, which is the neck-in phenomenon for monolayer film and the interface stability for multilayer film, using typical polymer material of 30 grams at once. The viscosity evaluated with our system corresponded with the result of commercial rheometer. It was also confirmed that the processability of mono and multilayer film could be evaluated quantitatively with our system.
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Affiliation(s)
- H. Uematsu
- Department of Polymer Science and Engineering, Yamagata University, Yamagata, Japan
- Department of Fiber Amenity Engineering, University of Fukui, Fukui, Japan
| | - S. Tanoue
- Department of Fiber Amenity Engineering, University of Fukui, Fukui, Japan
| | - Y. Iemoto
- Department of Fiber Amenity Engineering, University of Fukui, Fukui, Japan
| | - M. Sugimoto
- Department of Polymer Science and Engineering, Yamagata University, Yamagata, Japan
| | - T. Taniguchi
- Department of Polymer Science and Engineering, Yamagata University, Yamagata, Japan
- Department of Chemical Engineering, Kyoto University, Katsura-Campus, Kyoto, Japan
| | - K. Koyama
- Department of Polymer Science and Engineering, Yamagata University, Yamagata, Japan
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Abstract
Several studies have shown a higher prevalence of radiological abnormalities among gymnasts. However, the types of radiological abnormalities associated with low back pain (LBP) have not been clarified. The hypothesis was that significant relationships between radiological abnormalities and LBP may be revealed by discriminating between the types of MRI abnormalities while considering confounding factors. The subjects were 104 Japanese collegiate gymnasts (men, 70; women, 34). The presence of LBP was evaluated using the questionnaire developed by Osaka City University (OCU Test). Magnetic resonance imaging (MRI) abnormalities were evaluated using T1- and T2-weighted MRI. The prevalence of more than 1 MRI abnormality in gymnasts was 47.1% (49/104). The chi-square test showed that the incidence of lumbar disc degeneration (LDDG) and limbus vertebra was significantly greater in gymnasts with LBP than in gymnasts without LBP. By using logistic regression analysis to analyze the concomitant environmental variables, only LDDG (odds ratio, 2.70; 95% confidence interval, 1.10-6.66) was selected as a statistically significant variable accounting for LBP. In conclusion, LDDG is a predictor for LBP in Japanese collegiate gymnasts.
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Affiliation(s)
- K Koyama
- Department of Judotherapy, Tokyo Ariake University of Medical and Health Sciences, Tokyo, Japan.
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Oikawa Y, Katsuki T, Kawasaki M, Hashiguchi A, Mukai K, Handa K, Tomita M, Kabeya Y, Asai Y, Iwase K, Hirose S, Koyama K, Atsumi Y, Shimada A. Insulinoma may mask the existence of Type 1 diabetes. Diabet Med 2012; 29:e138-41. [PMID: 22356209 DOI: 10.1111/j.1464-5491.2012.03615.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Insulinoma is a tumour of insulin-producing cells of the pancreas and is known to be one of the causes of hypoglycaemia. Usually, appropriate removal of the insulinoma results in normalization of blood glucose levels. However, we found novel cases of insulinoma, in which hyperglycaemia developed soon after resection of the insulinoma. CASE REPORT We encountered two patients with repeated hypoglycaemia caused by insulinoma. Following removal of the insulinoma, unanticipated hyperglycaemia was observed in both patients. Thereafter, their blood tests revealed low levels of serum C-peptide and high titres of anti-glutamic acid decarboxylase antibody, indicating concomitant Type 1 diabetes. Indeed, histological examination of the resected specimen revealed that one patient showed insulitis in non-tumorous pancreatic tissue in which β-cells had already disappeared. Moreover, inflammatory cells infiltrated the insulinoma, as if it were insulitis of Type 1 diabetes, suggesting the existence of anti-islet autoimmunity. CONCLUSION These are first cases of insulinoma associated with underlying Type 1 diabetes. Physicians should be aware of the possibility that insulinoma may mask Type 1 diabetes, and measurement of anti-islet autoantibodies may be helpful to find underlying Type 1 diabetes, such as in these cases. It is pathologically interesting that the immune cell infiltration into insulinoma may be suggestive of anti-islet autoimmunity.
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Affiliation(s)
- Y Oikawa
- Department of Internal Medicine, Saiseikai Central Hospital, Tokyo, Japan.
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Koyama K, Nakazato K, Min S, Gushiken K, Hatakeda Y, Seo K, Hiranuma K. COL11A1 gene is associated with limbus vertebra in gymnasts. Int J Sports Med 2012; 33:586-90. [PMID: 22510797 DOI: 10.1055/s-0031-1299752] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Several studies have shown higher frequencies of radiological abnormalities among gymnasts. Recently, the gene encoding the α1 chain of type XI collagen, (COL11A1) (rs 1676486), was associated with lumbar disc herniation in the Japanese population. We hypothesized that there was a significant relationship between abnormal magnetic resonance imaging (MRI) findings of the lumbar spine and the COL11A1 4603C/T gene polymorphism in collegiate gymnasts. Our study participants included 103 Japanese collegiate gymnasts (70 men and 33 women). Radiological abnormalities were evaluated using T1- and T2-weighted MRI. Genotyping for COL11A1 was performed for all the participants. By using logistic regression analysis, we observed significant associations between limbus vertebra and age (adjusted odds ratio=0.51, 95% confidence interval: 0.27-0.96), sporting experience (adjusted odds ratio=1.49, 95% confidence interval: 1.14-1.94), and a TT genotype (adjusted odds ratio=7.83, 95% confidence interval: 1.33-46.03). We conclude that a TT genotype of COL11A1 polymorphism may be a significant risk factor for limbus vertebra in Japanese collegiate gymnasts.
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Affiliation(s)
- K Koyama
- Department of Judotherapy, Tokyo Ariake University of Medical and Health Sciences, Tokyo, Japan.
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47
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Kubota K, Kadomura T, Ohta K, Koyama K, Okuda H, Kobayashi M, Ishii C, Fujiwara Y, Nishiora T, Ohmae Y, Ohmae T, Kitajima M. Analyses of laboratory data and establishment of reference values and intervals for healthy elderly people. J Nutr Health Aging 2012; 16:412-6. [PMID: 22499467 DOI: 10.1007/s12603-011-0355-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVE Protein-energy malnutrition is a common disorder in the elderly. Although serum albumin is commonly used as a nutritional marker, data is lacking on serum albumin levels in the elderly. The purpose of this study was to determine whether serum albumin levels decrease with advancing age and to establish reference value and interval of laboratory data for elderly people (75 years and over). PARTICIPANTS Blood samples from 13821 healthy people, 42064 outpatients, and 15959 inpatients were collected during 2008. Blood from 127 of our nutrition support team (NST) patients was also collected during August 2006 and May 2009, and analyzed. MEASUREMENTS Serum albumin, hemoglobin, total cholesterol levels and lymphocyte count were determined. We analyzed the change in each parameter in accordance with age, compared the data for elderly people with younger people, and established new reference values. Clinical outcomes were examined depending on the improved reference values. RESULTS Albumin was lower in older persons than in younger persons. The estimated reference value and interval were 42 (48-36) g/l in older persons and was much lower in NST patients. Hemoglobin was decreased while cholesterol and lymphocyte count were not changed in older persons: all were markedly decreased in NST patients. Terms of hospital stay were significantly longer and mortality rates were significantly higher in older persons, comparing from above to below using a new reference value of albumin (36 g/l). CONCLUSIONS The serum albumin level decreases with advancing age, but it was maintained to some extent in healthy older people. Serum albumin levels related to the clinical outcome. Hemoglobin and cholesterol levels and lymphocyte count were all lower in NST patients. These measurements may be valuable markers of nutritional status and can help in guiding the need for nutritional support.
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Affiliation(s)
- K Kubota
- Nutrition Support Team and Department of Gastroenterological Surgery, International University of Health and Welfare Mita Hospital, Tokyo, Japan.
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48
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Ohshimo S, Ota K, Tamura T, Kida Y, Itai J, Suzuki K, Kanao K, Torikoshi Y, Koyama K, Otani T, Sadamori T, Une K, Tsumura R, Iwasaki Y, Hirohashi N, Tanigawa K. Prognostic impact of imported and newly-isolated methicillin-resistant Staphylococcus aureus in the ICU. Crit Care 2012. [PMCID: PMC3363459 DOI: 10.1186/cc10648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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49
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Abstract
Maxillary and mandibular fractures are a relatively frequent occurrence due to the exposed location of the jaws and are caused mainly by acts of violence, traffic and recreational accidents. Mandibular fractures can be treated conservatively with dental splints and intermaxillary fixation. Since Michelet, miniplate osteosynthesis via intraoral access has become the method of choice. Champy showed that the monocortical fixation of miniplates at the level of the linea obliqua results in stable osteosynthesis, despite postoperative micro-movements in the fracture gap, and postulated the principle of dynamic compression. Dislocated fractures of the mandibular collum are treated with stable osteosynthesis via an intra- or extraoral approach, while fractures of the mandibular joint are usually treated conservatively and early functional rehabilitation is favored. For mandibular fractures, the principle of load-bearing and load-sharing should be considered, i.e. in the case of sufficient bone and uncomplicated fractures, the bone can bear most of the force, such that miniplates are sufficient (load-sharing). If bones are weakened by atrophy or in the case of infected, comminuted or defect fractures osteosynthesis plates must bear the load alone (load-bearing).
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Affiliation(s)
- W Waiss
- Klinik und Poliklinik für Mund-, Kiefer- und Gesichtschirurgie, Universitätsklinikum Regensburg, Franz-Josef-Strauss-Allee 11, 93053, Regensburg, Deutschland.
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50
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Kotani K, Satoh-Asahara N, Kato Y, Araki R, Himeno A, Yamakage H, Koyama K, Tanabe M, Oishi M, Okajima T, Shimatsu A. Serum Amyloid a Low-Density Lipoprotein Levels and Smoking Status in Obese Japanese Patients. J Int Med Res 2011; 39:1917-1922. [DOI: 10.1177/147323001103900536] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
Abstract
Serum amyloid A low-density lipoprotein (SAA-LDL) is formed by an oxidative interaction and is considered to be a new marker related to oxidative modification of LDL. As the effect of smoking on oxidized LDL is of concern, this study investigated the association between SAA-LDL and smoking status. A total of 578 Japanese obese outpatients (mean ± SD age 50.5 ± 14.3 years) were studied. Smoking status was examined via a self-reported questionnaire. Cardiometabolic variables, including high-sensitivity C-reactive protein (hsCRP), were analysed in addition to SAA-LDL. There was an increasing trend in SAA-LDL levels from non- to ex- to current smokers, and significantly higher SAA-LDL levels were observed in current smokers versus non-smokers (median SAA-LDL level 36 μg/ml versus 28 μg/ml, respectively). This significant difference was reduced after adjusting for multiple confounders, including lipid levels. Smoking may be associated with increased levels of SAA-LDL in an obese Japanese population, but further studies are needed.
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Affiliation(s)
- K Kotani
- Division of Preventive Medicine, Clinical Research Institute, National Hospital Organization Kyoto Medical Centre, Kyoto, Japan
- Department of Clinical Laboratory Medicine, Jichi Medical University, Tochigi, Japan
| | - N Satoh-Asahara
- Division of Metabolic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Centre, Kyoto, Japan
| | - Y Kato
- Diabetes and Endocrine Centre, National Hospital Organization Nagoya Medical Centre, Nagoya, Japan
| | - R Araki
- Internal Medicine, National Hospital Organization Mie Hospital, Mie, Japan
| | - A Himeno
- Division of Metabolic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Centre, Kyoto, Japan
| | - H Yamakage
- Division of Metabolic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Centre, Kyoto, Japan
| | - K Koyama
- Diabetes Centre, National Hospital Organization Tokyo Medical Centre, Tokyo, Japan
- International University of Health and Welfare, Mita Hospital, Tokyo, Japan
| | - M Tanabe
- Diabetes Centre, National Hospital Organization Kokura Hospital, Kitakyu-syu, Japan
| | | | - T Okajima
- Diabetes Centre, National Hospital Organization Kokura Hospital, Kitakyu-syu, Japan
| | - A Shimatsu
- Division of Metabolic Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Centre, Kyoto, Japan
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