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Affiliation(s)
- K. Atsumi
- Institute of Medical Electronics Faculty of Medicine University of Tokyo Tokyo, Japan
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Atsumi K, Song HY, Senou H, Inoue K, Mabuchi K. Morphological features of an endangered Japanese strain of Cyprinus carpio: reconstruction based on seven SNP markers. J Fish Biol 2017; 90:936-953. [PMID: 27859297 DOI: 10.1111/jfb.13213] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 10/12/2016] [Indexed: 06/06/2023]
Abstract
Morphological analyses of 183 specimens of Japanese common carp Cyprinus carpio (171 from Lake Biwa and 12 from nursery ponds) using genetic hybrid indices demonstrated that the typical native Japanese strain of C. carpio has a more elongate body, more branched dorsal-fin rays, fewer and shorter gill rakers, more developed pneumatic bulb, more coiled pneumatic duct, longer posterior swimbladder and shorter intestine than the typical introduced C. carpio. These results provide a basis for a better understanding of the ecological characteristics and taxonomic status of the endangered Japanese strain of C. carpio.
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Affiliation(s)
- K Atsumi
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan
| | - H Y Song
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan
| | - H Senou
- Kanagawa Prefectural Museum of Natural History, 499 Iryuda, Odawara, Kanagawa, 250-0031, Japan
| | - K Inoue
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan
| | - K Mabuchi
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan
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Atsumi K, Nakamura K, Arimura H, Hirayama R, Sasaki T, Ohga S, Yoshitake T, Sakamoto K, Hirakawa M, Honda H. Utility of an Artificial Neural Network for Prediction of Survival in Patients With Esophageal Cancer Treated With Radiation Therapy. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.1110] [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: 10/24/2022]
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Terashima K, Nakamura K, Shioyama Y, Sasaki T, Ohga S, Nonoshita T, Yoshitake T, Atsumi K, Asai K, Hirakawa M, Anai S, Yoshikawa H, Honda H. Can a Belly Board Reduce Respiratory-Induced Prostate Motion in the Prone Position? — Assessed by Cine-Magnetic Resonance Imaging. Technol Cancer Res Treat 2013; 12:447-53. [DOI: 10.7785/tcrt.2012.500334] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The purpose of this study is to evaluate the real-time respiratory motion of the prostate and surrounding tissues/organs in the supine and prone positions and to investigate, using cine-MRI, whether a belly board can reduce respiratory-induced motion in the prone position. Cine-MRI scans were made of 13 volunteers in the supine and prone positions on a flat board and in two different prone positions using a belly board. Images in cine mode were recorded for 20 seconds. For each session, the points of interest (POIs) were located at the apex, base, mid-anterior surface and mid-posterior surface of the prostate; the tip of the seminal vesicle; the pubic symphysis; and the sacrum. The maximum range and standard deviation (SD) of the displacement from the mean value were calculated. The SDs for each of the four different positions were compared using a paired t-test. Respiratory-induced prostate motion was significantly larger in the prone position than in the supine position. However, when a belly board was used in the prone position, motion in the prostate and surrounding tissues/organs was significantly reduced. There were no significant differences between the two different positions using a belly board in any of the POIs.
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Affiliation(s)
- K. Terashima
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - K. Nakamura
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Y. Shioyama
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - T. Sasaki
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - S. Ohga
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - T. Nonoshita
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - T. Yoshitake
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - K. Atsumi
- Department of Radiology, Kyushu University Hospital at Beppu, Beppu, Japan
| | - K. Asai
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - M. Hirakawa
- Department of Radiology, Kyushu University Hospital at Beppu, Beppu, Japan
| | - S. Anai
- Department of Radiology, Kyushu University Hospital at Beppu, Beppu, Japan
| | - H. Yoshikawa
- Department of Radiology, Kyushu University Hospital at Beppu, Beppu, Japan
| | - H. Honda
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Matsumoto K, Sasaki T, Shioyama Y, Nakamura K, Atsumi K, Nonoshita T, Ooga S, Yoshitake T, Uehara S, Hirata H, Honda H. Treatment Outcome of High-dose-rate Interstitial Radiation Therapy for Patients with Stage I and II Mobile Tongue Cancer. Jpn J Clin Oncol 2013; 43:1012-7. [DOI: 10.1093/jjco/hyt108] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yoshidome S, Arimura H, Nakamura K, Shioyama Y, Atsumi K, Yoshikawa H, Nishikawa K, Hirata H. SU-E-J-40: Automated Estimation of Lung Tumor Locations for Tumor-Based Patient Setup Using MV-CBCT Images in Stereotactic Body Radiotherapy. Med Phys 2013. [DOI: 10.1118/1.4814252] [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: 11/07/2022] Open
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Terashima K, Nakamura K, Shioyama Y, Sasaki T, Ohga S, Nonoshita T, Yoshitake T, Atsumi K, Asai K, Honda H. Can Belly Board Reduce Respiratory-induced Prostate Motion in the Prone Position? Assessed by Cine-magnetic Resonance Imaging. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.947] [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: 10/27/2022]
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Atsumi K, Nakamura K, Shioyama Y, Abe K, Sasaki T, Ohga S, Yoshitake T, Sakamoto K, Hirakawa M, Honda H. Prognostic Value of FDG-PET in Definitive Chemoradiation Therapy for Esophageal Cancer. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.804] [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: 11/30/2022]
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Oda Y, Sugawara S, Atsumi K, Yamaguchi T, Saigusa M, Sakamoto K. A study on the output beam profile of a ring resonator type diplexer. EPJ Web of Conferences 2012. [DOI: 10.1051/epjconf/20123204019] [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: 11/14/2022] Open
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Atsumi K, Shioyama Y, Nomoto S, Ohga S, Nonoshita T, Ohnishi K, Terashima K, Nakamura K, Hirata H, Honda H. Predictive Factors of Cicatrical Esophageal Stenosis with Tumor Regression in Radiation Therapy for Esophageal Cancer in Complete Response Cases. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.670] [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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Ohnishi K, Shioyama Y, Nomoto S, Ohga S, Nonoshita T, Yoshitake T, Atsumi K, Terashima K, Hirata H, Honda H. Concurrent Chemoradiotherapy with S-1 (TS-1) as First-Line Treatment for Oropharyngeal Cancer. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.939] [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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Atsumi K, Shioyama Y, Nomoto S, Ohga S, Yoshitake T, Toba T, Ohnishi K, Terashima H, Ueda M, Honda H. Predictive Factors of Esophageal Stenosis after Radiation Therapy for Locally Advanced Esophageal Cancer. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.1743] [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: 11/28/2022]
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Shioyama Y, Nomoto S, Nakamura K, Ohga S, Yoshitake T, Toba T, Atsumi K, Shiinoki T, Terashima H, Honda H. Usefulness of Serum KL-6 and SP-D Levels for Predicting Radiation Pneumonitis After Stereotactic Radiotherapy for Lung Tumors. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.284] [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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Noguchi T, Mihara F, Yoshiura T, Togao O, Atsumi K, Matsuura T, Kuroiwa T, Honda H. MR imaging of human herpesvirus-6 encephalopathy after hematopoietic stem cell transplantation in adults. AJNR Am J Neuroradiol 2006; 27:2191-5. [PMID: 17110691 PMCID: PMC7977197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
BACKGROUND AND PURPOSE Human herpesvirus-6 (HHV-6)-associated encephalopathy tends to develop in immunocompromised patients. Neurologic symptoms, such as disorientation, short-term memory loss, convulsion, coma, and hypopnea could occur, but they may be nonspecific. We retrospectively reviewed MR images of 6 adults with HHV-6-associated encephalopathy to study characteristic imaging findings that could be useful in making the diagnosis. MATERIALS AND METHODS Between 2003 and 2005, we encountered 6 cases of HHV-6-associated encephalopathy (3 men and 3 women; age range, 36-55 years) in 3 hospitals. The diagnosis was made clinically according to the neurologic symptoms accompanied by high-level copies of HHV-6 DNA in CSF or peripheral blood by quantitative polymerase chain reaction without the detection of any other infectious pathogen. RESULTS All 6 patients had abnormal hippocampus/amygdala findings on presentation, and no other regions were involved. In the early period (0-2 days from onset), abnormal high signal intensity on fluid-attenuated inversion recovery (FLAIR) imaging (2 of 3, 67%) and on diffusion-weighted images accompanied by apparent diffusion coefficient (ADC) reduction (2 of 2, 100%) were observed. In the middle period (3-30 days), abnormal low signal intensity on T1-weighted images (5 of 6, 83%) and abnormal high signal intensity on T2-weighted images (4 of 6, 67%) and FLAIR (5 of 6, 83%) were confirmed. In the late period (> 30 days), we saw the resolution of signal intensity abnormalities and the appearance of atrophic change (4 of 4, 100%) of the affected regions. CONCLUSION HHV-6-associated encephalopathy in adults tends to affect the mesial temporal lobe. MR imaging is useful for detecting HHV-6 encephalopathy and distinguishing it from the other diseases of the central nervous system in immunocompromised patients.
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Affiliation(s)
- T Noguchi
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Bito H, Atsumi K, Katoh T, Ohmura M. Effects of sevoflurane anesthesia on plasma inorganic fluoride concentrations during and after cardiac surgery. J Anesth 2003; 13:156-60. [PMID: 14530935 DOI: 10.1007/s005400050048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [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
PURPOSE Sevoflurane metabolism results in the production of inorganic fluoride, which is known to be nephrotoxic. Since marked changes in body temperature and hemodynamics in cardiac surgery affect sevoflurane metabolism, plasma inorganic fluoride concentrations may differ in this situation compared with other types of surgery. We therefore measured plasma inorganic fluoride concentrations during and after sevoflurane anesthesia in patients undergoing cardiac surgery. METHODS Sixteen patients undergoing coronary artery bypass grafting or valve replacement were premedicated with 5-10 mg midazolam and 0.5 mg scopolamine injected intramuscularly. Anesthesia was induced with 5-10 mg midazolam, 0.5-1 mg fentanyl, and 0.12-0.15 mg.kg(-1) vecuronium. Following tracheal intubation, anesthesia was maintained with oxygen, sevoflurane, and fentanyl. At the onset of cardiopulmonary bypass (CPB), sevoflurane was discontinued, and additional fentanyl, midazolam, and pancuronium were administered. Plasma inorganic fluoride concentrations were measured before anesthesia, immediately before and after CPB, and at 0, 2, 6, 12, 24, and 48 h after anesthesia. RESULTS The individual maximum plasma inorganic fluoride concentration was 19.2 +/- 7.2 micromol.l(-1) (mean +/- SD; range, 9.2-36.7). The mean plasma inorganic fluoride concentrations increased during anesthesia, but the rate of increase decreased after the initiation of CPB. Concentrations peaked at 2 h after anesthesia and decreased thereafter. The concentrations in three cases continued to increase 2 h after anesthesia. CONCLUSION The plasma inorganic fluoride concentrations observed in patients undergoing cardiac surgery were below nephrotoxic levels. However, the decrease in mean fluoride concentration after anesthesia was slower than that in the previous study in general surgical patients.
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Affiliation(s)
- H Bito
- Department of Anesthesiology and Intensive Care, Hamamatsu University School of Medicine, 3600 Handa-cho, Hamamatsu 431-3192, Japan
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Zhang HC, Kushida K, Atsumi K, Kin K, Nagano A. Effects of age and menopause on spinal bone mineral density in Japanese women: a ten-year prospective study. Calcif Tissue Int 2002; 70:153-7. [PMID: 11907711 DOI: 10.1007/s00223-001-1037-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [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] [Received: 04/13/2001] [Accepted: 10/08/2001] [Indexed: 11/26/2022]
Abstract
In order to determine the age and menopause-related changes in spinal bone mineral density (BMD) in healthy Japanese women, the spinal BMD at L(2-4) was measured by dual X-ray absorptiometry (DXA) in 172 healthy Japanese women aged 31-69 years (mean age 53.1+/-6.7 years) in 1990 and 2000. This prospective study showed that there was no significant decrease of BMD in premenopausal women, but there was a significant decrease of BMD (-1.59%/year) in the early post menopausal women when compared with the premenopausal and late postmenopausal women (P <0.0001). The rate of decrease in BMD slowed down with the prolongation of the years since menopause (YSM). In postmenopausal women the annual rate of decrease in BMD for obese women was significantly lower than that for slim ones (P <0.01), suggesting that fat tissue may be effective for preventing bone loss. A multiple regression analysis of variables contributing to the annual rate of decrease in spinal BMD showed that YSM and physiological age were the most influential factors, considering other factors such as weight, height and bone mass index. In conclusion, an accelerated bone loss was seen in the early postmenopausal stage. The YSM and physiological age were the most important factors that affect the rate of bone loss in healthy postmenopausal Japanese women.
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Affiliation(s)
- H C Zhang
- Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu 431-3192, Japan
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Kumagai K, Ogino N, Demizu S, Atsumi K, Kurihara H, Iwaki M, Ishigooka H, Tachi N. [Clinical features of idiopathic macular holes-differences between sexes and stages]. Nippon Ganka Gakkai Zasshi 2001; 105:452-6. [PMID: 11510109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
PURPOSE The purpose of this study was to evaluate the differences in the clinical features of idiopathic macular holes between sexes and stages. METHODS Five hundred and twenty-six eyes of 480 patients with stage 3 or 4 idiopathic macular hole that had undergone vitrectomy were observed consecutively in this study. The each stage ratio, bilaterality, and affected eye were examined and the differences in age, hole duration, hole size, visual acuity, refractive power, axial length, and corneal refractive power were evaluated. RESULTS Twenty-six % of the cases were stage 4 in males and 31% in females. There were no significant differences in bilaterality or affected eye between the sexes. Younger age and larger size were found in females of stage 3. Larger size was found in stage 4. More myopic eye and longer axial length were found in males of stage 4. There were no significant differences in hole duration and visual acuity between sexes or stages. CONCLUSIONS In females the onset of macular hole occurred at a younger age than in males, size of the hole was larger from an earlier stage, and refractive power was less myopic. More myopic eye and longer axial length were found in stage 4, especially in males. This fact might be related to the existence of posterior vitreous detachment. We concluded that there were some differences in the mechanism of the onset and the progression of idiopathic macular hole between males and females.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, 899-0035 Mego, Shimokitakata-cho, Miyazaki 880-0035, Japan
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Kumagai K, Ogino N, Demizu S, Atsumi K, Kurihara H, Iwaki M, Ishigooka H, Tachi N. [Operculum in idiopathic macular holes]. Nippon Ganka Gakkai Zasshi 2001; 105:96-101. [PMID: 11235207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
PURPOSE To detect the factors related to the operculum in idiopathic macular holes and present a pathogenesis of idiopathic macular holes. METHODS This study included 583 eyes of idiopathic macular hole that underwent macular hole surgery. To detect the factor related to the operculum, the variables of age, duration of symptoms, hole size, preoperative visual acuity, refraction, axial length, refraction axial length ratio were used for the comparison between two groups and multiple regression. The success rate of surgery and postoperative visual acuity were examined whether the operculum was present or not. RESULTS The variables that were significantly related to the operculum were as follows: refraction axial length ratio (r = 0.18, p = 0.0092) in women of stage 3, duration of symptoms (r = -0.44, p < 0.001), preoperative visual acuity (r = -0.33, p = 0.0025), and refraction axial length ratio (r = -0.22, p = 0.020) in women of stage 4, and age (r = 0.19, p = 0.047) in men of stage 3. There were no significant differences in the success rate of surgery and postoperative visual acuity whether the operculum was present or not. CONCLUSIONS Generally, operculum tends to occur in aged and round eyes and possibly does not occur in younger and back projected eyes because of retinal fissure. In women of stage 4, the operculum is possibly a torn retina and does not occur in atrophic holes.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, 899 Mego, Shimokitakata-cho, Miyazaki 880-0035, Japan
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Kumagai K, Ogino N, Demizu S, Atsumi K, Kurihara H, Iwaki M, Ishigooka H, Tachi N. [Factors related to intraoperative retinal breaks in macular hole surgery]. Nippon Ganka Gakkai Zasshi 2001; 105:129-33. [PMID: 11235202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
PURPOSE To evaluate the factors of intraoperative retinal breaks in macular hole surgery. METHODS This study included 558 eyes of 506 patients who underwent idiopathic macular hole surgery by one surgeon. Multiple regression was performed using the variables of gender, age, affected eye, lens status, stage, duration of symptoms, hole size, axial length, and lattice degeneration. RESULTS The rate of retinal breaks was higher in stage 3 (16.0%) than in stage 4 (8.2%) (p = 0.014). In eyes with lattice degeneration intraoperative retinal breaks occurred in about 40% of the cases. Major factors were as follows: lattice degeneration (r = 0.24, p < 0.0001) in all eyes, stage (r = 0.090, p = 0.048) in eyes without lattice degeneration, and gender (r = -0.18, p = 0.035) in eyes of stage 4 without lattice degeneration. CONCLUSIONS The factors of intraoperative retinal breaks in macular hole surgery were lattice degeneration in all eyes and stage 3 in eyes without lattice degeneration. The high incidence of intraoperative retinal breaks in stage 3 was mainly due to the occurrence of posterior vitreous detachment. Male gender was a significant factor associated with intraoperative retinal breaks.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, 899 Mego, Shimokitakata, Miyazaki 880-0035, Japan
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Kumagai K, Ogino N, Demizu S, Shinjo U, Shioya M, Ueda K, Fukuoka Y, Atsumi K, Hayashi H. Refraction and Anterior Chamber Depth Change After Vitrectomy for Pseudophakia. Jpn J Ophthalmol 2001; 45:115-116. [PMID: 11341903 DOI: 10.1016/s0021-5155(00)00330-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Purpose: To evaluate the association between the vitreous and the refractive error in pseudophakia.Methods: Vitrectomy was performed in 67 eyes of 61 patients who underwent cataract surgery. Vitrectomy was needed for epiretinal membrane in 30 eyes, macular edema in 22 eyes, macular hole in 3 eyes, lamelar macular hole in 2 eyes, macular hole in 3 eyes, lamelar macular hole in 2 eyes, vitreous opacity in 6 eyes, and vitreous hemorrhage in 4 eyes. Refraction was measured before the operation, and 1 month, 3 months, 6 months, and 12 months after operation. Anterior chamber depth was measured in 10 eyes before the operation, and 1 month, 3 months, and 6 months after operation. We evaluated the refractive error after vitrectomy in 49 eyes that had predicted refraction.Results: The mean value of refractive change was -0.3 D 1 month postoperatively, and then gradually became positive. The variation of refraction (6-month postoperative refraction minus preoperative refraction) was negatively correlated with preoperative refraction (P =.0052, R(2) = 0.146). If preoperative refraction was more myopic than -1.5 D, then refraction became positive. If preoperative refraction was not more myopic than -1.5 D, then refraction became negative.Conclusion: About 15% of postoperative refractive error may be associated with the vitreous, but further investigation is required.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, Miyazaki, Japan
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Kumagai K, Ogino N, Demizu S, Atsumi K, Kurihara H, Iwaki M, Ishigooka H, Tachi N. Incidence of Reopening and Variables That Influence Reopening After Macular Hole Surgery. Jpn J Ophthalmol 2001; 45:112-113. [PMID: 11341897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
Purpose: To evaluate the incidence and variables of reopening of macular holes after macular hole surgery.Methods: Our study included 467 eyes in which macular holes were successfully closed after surgery. Surgical techniques consisted of conventional methods (358 eyes) and scalping methods (109 eyes) with retinal pigment scalping of the macular hole basis added in such cases: reoperation, hole size (more than 0.4 disc diameter), duration of symptoms (more than 2 years). Long term incidence of reopening was predicted by life table method. After we compared reopened cases with non-reopened cases, the variables of gender, stage, biocular occurrence, age, duration of symptoms, hole size, preoperative visual acuity, refraction axial length ratio, and intraoperative retinal tears were used for the multiple regression.Results: Reopening was found in 20 eyes (5.6%) treated by conventional methods and in 10 eyes (9.2%) treated by scalping methods. Survival ratio was 87% for the conventional methods in 6 years and 79% for the scalping methods in 5 years. The variables influencing reopening were as follows: conventional methods: gender (r = 0.065, P =.19), biocular occurrence (r = 0.12, P =.026), and refraction axial length ratio (r = -0.11, P =.045); scalping methods: hole size (r = 0.14, P =.25).Conclusions: Incidence of reopening in scalping methods was high. The variables that influenced reopening after macular hole surgery were biocular occurrence and refraction axial length ratio in conventional methods. The shape of the eye may be related to reopening.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, Miyazaki, Japan
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Kumagai K, Ogino N, Demizu S, Atsumi K, Kurihara H, Iwaki M, Ishigooka H, Tachi N. Variables That Influence Visual Acuity After Macular Hole Surgery. Jpn J Ophthalmol 2001; 45:112. [PMID: 11341895 DOI: 10.1016/s0021-5155(00)00317-8] [Citation(s) in RCA: 3] [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: 11/16/2022]
Abstract
Purpose: To evaluate the variables that influence visual acuity and visual improvement after macular hole surgery.Methods: Our study included 421 eyes in which macular holes were successfully closed after surgery and followed up at least 1 year after the last surgery. Surgical techniques were conventional methods (Group 1: 350 eyes) with retinal pigment scalping of the macular hole basis added in the refractory cases (Group 2: 71 eyes). The variables used for the multiple regression were gender, age, preoperative visual acuity, hole stage, duration of symptoms, hole size, and axial length.Results: The variables that most influenced postoperative visual acuity were as follows: Group 1: gender (r = -0.011, P =.016), age (r = -0.17, P =.005), preoperative visual acuity (r = 0.51, P <.0001), duration of symptoms (r = -0.015, P <.0001), and axial length (r = -0.090, P =.045). Group 2: age (r = -0.18, P =.047), and preoperative visual acuity (r = 0.47, P <.0001).Conclusions: The variables that influenced visual acuity and visual improvement after macular hole surgery were common. In Group 1: gender, age, preoperative visual acuity, duration of symptoms, and axial length; in Group 2: age and preoperative visual acuity.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, Miyazaki, Japan
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Jin QM, Takita H, Kohgo T, Atsumi K, Itoh H, Kuboki Y. Effects of geometry of hydroxyapatite as a cell substratum in BMP-induced ectopic bone formation. J Biomed Mater Res 2000; 52:491-9. [PMID: 11033569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- Q M Jin
- Department of Biochemistry, School of Dentistry, Hokkaido University, N-13, W-7, Kita-Ku, Sapporo, 060-8586, Japan
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Masakitsushima, Iwamatsu K, Umemura E, Kudo T, Sato Y, Shiokawa S, Takizawa H, Kano Y, Kobayashi K, Ida T, Tamura A, Atsumi K. CP6679, a new injectable cephalosporin. Part 1: synthesis and structure-activity relationships. Bioorg Med Chem 2000; 8:2781-9. [PMID: 11131169 DOI: 10.1016/s0968-0896(00)00214-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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: 10/18/2022]
Abstract
A series of cephalosporins bearing a 5,5-fused ring system, an (imidazo[5,1-b]thiazolium-6-yl)methyl group, at the C-3 position were synthesized and evaluated for in vitro antibacterial activities. CP6679 (1s) and its analogues showed potent antibacterial activities against gram-positive and gram-negative bacteria, including Pseudomonas aeruginosa. They were also highly active against methicillin-resistant Staphylococcus aureus (MRSA). CP6679 (1s) showed more potent antibacterial activity than ceftazidime (CAZ) or cefpirome (CPR) against Pseudomonas aeruginosa and MRSA.
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Affiliation(s)
- Masakitsushima
- Pharmaceutical Research Center, Meiji Seika Kaisha, Ltd., Yokohama, Japan
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Kumagai K, Ogino N, Demizu S, Atsumi K, Kurihara H, Iwaki M, Ishigooka H, Tachi N. [Factors related to initial success in macular hole surgery]. Nippon Ganka Gakkai Zasshi 2000; 104:792-6. [PMID: 11530369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
PURPOSE To evaluate the factors of initial success in macular hole surgery. METHODS This study included 526 eyes of 480 patients who underwent idiopathic macular hole surgery by one and the same surgeon. Surgical methods included conventional method (392 eyes), retinal pigment epithelium (RPE) scalping (61 eyes), internal limiting membrane (ILM) removal (62 eyes), and RPE scalping combined with ILM removal (11 eyes). To evaluate the factors of initial success multiple regression was performed using the variables of (gender, age, stage, duration of symptoms, hole size, axial length, and preoperative visual acuity). RESULTS The rate of initial success was 81.4% in all eyes, 80.9% in the conventional method, 78.7% in RPE scalping, 83.9% in ILM removal, and 100% in RPE scalping combined with ILM removal. Significant factors of initial success were as follows: gender (r = -0.091, p = 0.053), age (r = -0.14, p = 0.0062), duration of symptoms (r = -0.23, p < 0.0001), hole size (r = -0.23, p < 0.0001), and axial length (r = -0.21, p < 0.0001) in the conventional method, hole size (r = -0.56, p = 0.0006) in ILM removal and stage (r = -0.43, p = 0.0011) and preoperative visual acuity (r = 0.30, p = 0.018) in RPE scalping. CONCLUSIONS Significant factors of initial success were being male being young, shorter duration of symptoms, smaller hole size, and shorter axial length in the conventional method, smaller hole size in ILM removal and stage 4 and better preoperative visual acuity in RPE scalping method.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, 899 Shimokitakata, Mego, Miyazaki 880-0035, Japan
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Kumagai K, Ogino N, Demizu S, Atsumi K, Kurihara H, Iwaki M, Ishigooka H, Tachi N. [Clinical features of idiopathic macular holes]. Nippon Ganka Gakkai Zasshi 2000; 104:819-25. [PMID: 11530373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
PURPOSE The purpose of this study was to evaluate the clinical features of idiopathic macular holes. MATERIALS AND METHODS The clinical features were examined in consequentive 526 eyes of 480 patients with idiopathic macular hole who underwent vitrectomy. RESULTS Sixty-seven% of the patients were female. The mean onset age was 64.4 years of age and 60% of the cases were in their 60's at the time of onset. The mean refractive value was -0.66 dioptor and 40% of the cases were emmetropia with a refractive value between -1.0 dioptor and +1.0 dioptor. The onset age was positively correlated with refractive value. The visual acuity was negatively correlated with onset age, duration after onset, and the size of the macular hole. The duration was positively correlated with onset age. The size of the macular hole was positively correlated with age and duration. The factors for good visual acuity were determined by bilaterality, youth, or small size. Also we found the factors for large size of macular holes to be female gender, long duration of the hole, being in stage 4, and low visual acuity. CONCLUSIONS The incidence of idiopathic macular hole is seen more in eyes of patients in their 60's and in emmetropic eyes. Patients with myopic eyes tend to have younger onset. The size of the macular hole in females tends to be larger than in males.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, 899 Mego, Shimokitakata, Miyazaki 880-0035, Japan
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Jin QM, Takita H, Kohgo T, Atsumi K, Itoh H, Kuboki Y. Effects of geometry of hydroxyapatite as a cell substratum in BMP-induced ectopic bone formation. J Biomed Mater Res 2000; 51:491-9. [PMID: 10880093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Three different types of porous hydroxyapatite with pore sizes of 100-200 micrometer in diameter-porous particles of hydroxyapatite (PPHAP), porous blocks of hydroxyapatite (PBHAP), and honeycomb-shaped hydroxyapatite (HCHAP)-were compared in terms of their abilities to induce osteogenesis when implanted subcutaneously with recombinant human BMP-2 into rats and extracted at 1, 2, 3, and 4 weeks. Histologically, direct bone formation occurred in PPHAP and PBHAP while only endochondral ossification took place in HCHAP. Interestingly, cartilage in the central zones and bone in the orifice zones of the tunnels of the HCHAP were observed at 2 weeks. After 3 weeks, the cartilage disappeared and bone formation occurred throughout the inner surface of the tunnels of the HCHAP, always leaving space for capillaries within the tunnels. Alkaline phosphatase activity and osteocalcin content were the highest in HCHAP among the three hydroxyapatite implants. These results clearly indicate that BMP-induced bone formation is highly dependent on the geometry of the carrier, which provides feasible structural factors for vascularization.
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Affiliation(s)
- Q M Jin
- Department of Biochemistry, School of Dentistry, Hokkaido University, N-13, W-7, Kita-Ku, Sapporo, 060-8586, Japan
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Atsumi K. [Artificial organ]. Tanpakushitsu Kakusan Koso 2000; 45:2325-30. [PMID: 11021243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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Kumagai K, Ogino N, Demizu S, Shinjo U, Shioya M, Ueda K, Fukuoka Y, Atsumi K, Hayashi H. [Refraction and anterior chamber depth change after vitrectomy for pseudophakia]. Nippon Ganka Gakkai Zasshi 2000; 104:567-71. [PMID: 10979297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
PURPOSE To evaluate the association between the vitreous and the refractive error in pseudophakia. METHODS Vitrectomy was performed in 67 eyes of 61 patients who underwent cataract surgery. Vitrectomy was needed for epiretinal membrane in 30 eyes, macular edema in 22 eyes, macular hole in 3 eyes, lamelar macular hole in 2 eyes, vitreous opacity in 6 eyes, and vitreous hemorrhage in 4 eyes. Refraction was measured before the operation, and 1 month, 3 months, 6 months, and 12 months after operation. Anterior chamber depth was measured in 10 eyes before the operation, and 1 month, 3 months, and 6 months after operation. We evaluated the refractive error after vitrectomy in 49 eyes that had predicted refraction. RESULTS The mean value of refractive change was -0.3 D 1 month postoperatively, and then gradually became positive. The variation of refraction (6-month postoperative refraction minus preoperative refraction) was negatively correlated with preoperative refraction (p = 0.0052, R2 = 0.146). If preoperative refraction was more myopic than -1.5 D, then refraction became positive. If preoperative refraction was not more myopic than -1.5 D, then refraction became negative. CONCLUSION About 15% of postoperative refractive error may be associated with the vitreous, but further investigation is required.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, Miyazaki, Japan
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Kumagai K, Ogino N, Demizu S, Atsumi K, Kurihara H, Iwaki M, Ishigooka H, Tachi N. [Variables that influence visual acuity after macular hole surgery]. Nippon Ganka Gakkai Zasshi 2000; 104:471-5. [PMID: 10934864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/15/2023]
Abstract
PURPOSE To evaluate the variables that influence visual acuity and visual improvement after macular hole surgery. METHODS Our study included 421 eyes in which maculor holes were successfully closed after surgery and followed up at least 1 year after the last surgery. Surgical techniques were conventional methods (Group 1: 350 eyes) with retinal pigment scalping of the macular hole basis added in the refractory cases (Group 2: 71 eyes). The variables used for the multiple regression were gender, age, preoperative visual acuity, hole stage, duration of symptoms, hole size, and axial length. RESULTS The variables that most influenced postoperative visual acuity were as follows: Group 1: gender (r = -0.011, p = 0.016), age (r = -0.17, p = 0.005), preoperative visual acuity (r = 0.51, p < 0.0001), duration of symptoms (r = -0.015, p < 0.0001), and axial length (r = -0.090, p = 0.045). Group 2: age (r = -0.18, p = 0.047), and preoperative visual acuity (r = 0.47, p < 0.0001). CONCLUSIONS The variables that influenced visual acuity and visual improvement after macular hole surgery were common. In Group 1: gender, age, preoperative visual acuity, duration of symptoms, and axial length; in Group 2: age and preoperative visual acuity.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, Miyazaki, Japan
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Kumagai K, Ogino N, Demizu S, Atsumi K, Kurihara H, Iwaki M, Ishigooka H, Tachi N. [Incidence of reopening and variables that influence reopening after macular hole surgery]. Nippon Ganka Gakkai Zasshi 2000; 104:483-8. [PMID: 10934866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
PURPOSE To evaluate the incidence and variables of reopening of macular holes after macular hole surgery. METHODS Our study included 467 eyes in which maculor holes were successfully closed after surgery. Surgical techniques consisted of conventional methods (358 eyes) and scalping methods (109 eyes) with retinal pigment scalping of the macular hole basis added in such cases: reoperation, hole size (more than 0.4 disc diameter), duration of symptoms (more than 2 years). Long term incidence of reopening was predicted by life table method. After we compared reopened cases with non-reopened cases, the variables of gender, stage, biocular occurrence, age, duration of symptoms, hole size, preoperative visual acuity, refraction axial length ratio, and intraoperative retinal tears were used for the multiple regression. RESULTS Reopening was found in 20 eyes (5.6%) treated by conventional methods and in 10 eyes (9.2%) treated by scalping methods. Survival ratio was 87% for the conventional methods in 6 years and 79% for the scalping methods in 5 years. The variables influencing reopening were as follows: conventional methods: gender (r = 0.065, p = 0.19), biocular occurrence (r = 0.12, p = 0.026), and refraction axial length ratio (r = -0.11, p = 0.045); scalping methods: hole size (r = 0.14, p = 0.25). CONCLUSIONS Incidence of reopening in scalping methods was high. The variables that influenced reopening after macular hole surgery were biocular occurrence and refraction axial length ratio in conventional methods. The shape of the eye may be related to reopening.
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Affiliation(s)
- K Kumagai
- Shinjo Ophthalmologic Institute, Miyazaki, Japan
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Hoshino H, Kushida K, Takahashi M, Yamazaki K, Denda M, Atsumi K, Oikawa M, Toyoyama O, Kawana K, Inoue T. Changes in levels of biochemical markers and ultrasound indices of Os calcis across the menopausal transition. Osteoporos Int 2000; 11:128-33. [PMID: 10793870 DOI: 10.1007/s001980050016] [Citation(s) in RCA: 19] [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
The aim of this longitudinal study was to investigate the changes in the levels of biochemical markers and ultrasound indices of os calcis across the menopausal transition. One hundred and ten healthy women (age 35-59 years at the 1992 baseline) participated in this 4-year population-based longitudinal study. Serum intact osteocalcin (IOC), urinary pyridinoline (Pyr), urinary deoxypyridinoline (Dpyr) and ultrasound indices were measured at baseline and after 4 years. The percentage changes in biochemical markers (% delta IOC, % delta Pyr and % delta Dpyr) and the percentage decreases in the ultrasound indices (% delta SOS, % delta BUA and % delta Stiffness) were calculated. The values of % delta IOC and % delta Dpyr in the perimenopausal subgroup (-4 to -3 years since menopause) and the values of % delta SOS and % delta Stiffness in the perimenopausal subgroup (-2 to 0 years since menopause) were significantly higher than those in other groups. Pyr was significantly correlated with % delta SOS (r = -0.467, p < 0.01) and % delta Stiffness (r = -0.330, p < 0.05) and Dpyr was significantly correlated with % delta SOS (r = -0.390, p < 0.05), % delta BUA (r = -0.353, p < 0.05) and % delta Stiffness (r = -0.454, p < 0.05), while % delta IOC was significantly correlated with % delta SOS (r = -0.278, p < 0.05), % delta BUA (r = -0.369, p < 0.01) and % delta Stiffness (r = -0.383, p < 0.01) in the peri- and postmenopausal groups. These results indicate that the increase in bone turnover occurs 4 years before menopause. However, the correlations between biochemical markers and ultrasound indices were too low to allow prediction of bone change in the individual patient.
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Affiliation(s)
- H Hoshino
- Department of Orthopedic Surgery, Hamamatsu University School of Medicine, Japan
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Abstract
We determined the prevalence of vertebral fractures in hemodialysis (HD) patients, investigated whether low bone mineral density (BMD) is predictive of vertebral fracture, and evaluated the effect of serum intact parathyroid hormone (iPTH) and alkaline phosphatase (ALP) levels on vertebral fracture. One hundred eighty-seven male HD patients were assessed for vertebral fractures, and lumbar-spine and total-body BMD were measured by dual-energy x-ray absorptiometory. Thirty-nine patients (20.9%) had vertebral fractures. Each standard deviation (SD) decrease in lumbar-spine BMD increased the age-adjusted odds ratio of vertebral fracture 2.0 times (95% confidence interval [CI], 1.4 to 2.0) and 1.6 times (95% CI, 1.1 to 1.6) for total-body BMD. The area under the receiver operating characteristic curve for lumbar-spine BMD was significantly greater than that for total-body BMD (P < 0.05). Patients with serum iPTH levels in the lowest tertile had a 2.4-fold greater risk for vertebral fracture than those in the middle tertile and a 1.6-fold greater risk than those in the highest tertile (P < 0.05). When the two criteria of lowest tertile of serum iPTH level and highest tertile of serum ALP level were combined, the prevalence of vertebral fractures was the greatest. Similarly, when the lowest tertile of serum iPTH level and lowest tertile of serum ALP level were combined, the prevalence was the second greatest among the combined groups according to tertiles of serum iPTH and ALP levels. We conclude that low lumbar-spine BMD might be a sensitive predictor of vertebral fracture in HD patients, and patients with relatively low iPTH levels would have a greater risk for vertebral fracture than those with hyperparathyroidism.
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Affiliation(s)
- K Atsumi
- Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, Japan.
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Iwasaki S, Atsumi K, Ocho S, Mizuta K. Facial nerve stimulation by a cochlear implant in a hemodialysis patient with bone of low mineral density. Eur Arch Otorhinolaryngol 1998; 255:352-4. [PMID: 9783131 DOI: 10.1007/s004050050075] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [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: 10/28/2022]
Abstract
Facial nerve stimulation by an activated cochlear implant was noted in a 56-year-old patient who had undergone cochlear implant with a Nucleus 22 implant 2 years previously as treatment for total sensorineural hearing loss following meningitis at age 54. Past history was complicated by total renal failure for which hemodialysis had been required during the past 13 years. Facial spasm occurred 5 months postoperatively with activation of the basal electrodes (channels 13 and 15 of the implant). The facial stimulation was eliminated by deprogramming these electrodes. High-resolusion computed tomography (CT) scanning was unable to demonstrate lucency of the otic capsule and cochlear ossification, but basal electrodes of the implant could be identified near the labyrinthine segment of the facial nerve. To further evaluate bone changes in the patient, the total and regional bone mineral density (BMD) of the head and radius was measured by dual energy X-ray absorptiometry. All BMD values of the patient were markedly low when compared to those of 62 other hemodialysis patient. These findings demonstrate that facial nerve stimulation can occur in the presence of low impedance due to cortical bone changes induced by long-term hemodialysis.
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Affiliation(s)
- S Iwasaki
- Department of Otorhinolaryngology, Hamamtsu University School of Medicine, Japan
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Abe Y, Chinzei T, Mabuchi K, Snyder AJ, Isoyama T, Imanishi K, Yonezawa T, Matsuura H, Kouno A, Ono T, Atsumi K, Fujimasa I, Imachi K. Physiological control of a total artificial heart: conductance- and arterial pressure-based control. J Appl Physiol (1985) 1998; 84:868-76. [PMID: 9480945 DOI: 10.1152/jappl.1998.84.3.868] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [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: 02/06/2023] Open
Abstract
To obtain a physiological response by a total artificial heart (TAH), while eliminating the hemodynamic abnormalities commonly observed with its use, we proposed the use of a conductance- and arterial pressure-based method (1/R control) to determine TAH cardiac output. In this study, we endeavored to make use of a variable more closely tied to central nervous system (CNS) efferents, systemic conductance, to provide the CNS with more direct control over the output of the TAH. The control equation that calculates the target cardiac output of the TAH was constructed on the basis of measurement of blood pressures and TAH flow. The 1/R control method was tested in TAH-recipient goats with an automatic method by using a microcomputer. In 1/R control animals, the typical TAH pathologies, such as mild arterial hypertension and substantial systemic venous hypertension, did not occur. Cardiac output varied according to daily activity level and exercise in a manner similar to that observed in natural heart goats. These results indicate that we have determined a control method for the TAH that avoids hemodynamic abnormalities exhibited by other TAH control systems and that exhibits physiological responses to exercise and daily activities under the conditions tested. The stability of the control and the complete lack of inappropriate excursions in cardiac output is suggestive of CNS involvement in stabilizing the system.
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Affiliation(s)
- Y Abe
- Institute of Medical Electronics, Faculty of Medicine, University of Tokyo, Tokyo 113, Japan.
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Kagawa Y, Horiuchi T, Sezai Y, Akutsu T, Akune J, Atsumi K, Abe N, Arai T, Inoue T, Iwa T. [Current status of clinical application of ventricular assist device in Japan]. Rinsho Kyobu Geka 1997; 7:223-7. [PMID: 9301779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Atsumi K, Akutsu T. [The present status and controversial points for the clinical application of total artificial heart]. Rinsho Kyobu Geka 1997; 7:247-9; discussion 250-2. [PMID: 9301784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Ishihara C, Kushida K, Takahashi M, Koyama S, Kawana K, Atsumi K, Inoue T. Effect of thyroid hormone on bone and mineral metabolism in rat: evaluation by biochemical markers. Endocr Res 1997; 23:167-80. [PMID: 9378104 DOI: 10.3109/07435809709031851] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 02/05/2023]
Abstract
We evaluated the effects of the thyroid hormone on bone and mineral metabolism in rats using biochemical markers [pyridinoline (Pyr), deoxypyridinoline (Dpyr), Osteocalcin (OC), alkaline phosphatase (Alp)] and the measuring of bone mineral density (BMD). First, the rats were divided into three groups: 1) control group 2) The fifty micrograms group (T3-50) [It was given 50 micrograms/kg ip/day of triiod-l-thyronine (T3) for 2 weeks.] 3)The hundred micrograms group (T3-100) [It was given 100 micrograms/kg ip/day of T3 for 2 weeks.] Next, the rats were divided into two groups: 1)control group and 2)T3 group. The latter was given 100 micrograms/kg of T3 ip/day for 4 weeks. In experiment 1, Pyr and Dpyr levels in the T3 groups were significantly higher or well tended to be higher than those in the control group. OC levels in the T3 groups were significantly higher than in the control group until day 7. The Z-score of Pyr and Dpyr in T3-100 were two to thirteen times higher than those of OC and Alp. In experiment 2, Pyr and Dpyr levels in the T3 group were significantly higher or well tended to be higher than those in the control group. OC levels in the T3 group were significantly higher than those in the control group only on day 3. In the present study, the administering of T3 100 micrograms decreased both cortical (tibia) and trabecular (lumbar spine) BMDs in the rats. Bone resorption continued to increase after increased bone formation was reduced by T3 administration. Furthermore, bone resorption exceeded bone formation throughout T3 administration.
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Affiliation(s)
- C Ishihara
- Department of Orthopedic Surgery, Hamamatsu University School of Medicine, Japan
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41
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Tachi N, Hashimoto Y, Kondo M, Atsumi K, Ogino N. [Vitreous surgery for macular hole followed membrane peeling]. Nippon Ganka Gakkai Zasshi 1997; 101:692-7. [PMID: 9284626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We performed vitreous surgery for macular holes following membrane peeling. The cases were five eyes of five females aged 42 to 67 years at the time of membrane peeling, out of 441 eyes of 414 patients who underwent membrane peeling. One eye had secondary epiretinal membrane combined with ocular sarcoidosis, two eyes had idiopathic epiretinal membrane, and two eyes had idiopathic vitreoretinal traction syndrome. The presumed interval from membrane peeling to macular hole formation was 5 to 90 months (average 14 months). For treatment of the macular holes, membrane peeling and SF6 gas tamponade were performed. In four eyes of the five eyes, the macular hole was closed. In the remaining eye, removal of the retinal pigment epithelium from the base of macular hole and application of fibrin glue were used in addition to SF6 gas tamponade, but the macular hole was not closed. The follow-up term was 10-24 months (average 17.6 months). Geometrical mean visual acuity was 0.34 before membrane peeling, 0.94 at maximum after membrane peeling, 0.19 after macular hole formation, 0.51 at maximum after macular hole surgery, and 0.44 at the final visit.
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Affiliation(s)
- N Tachi
- Department of Ophthalmology, Shinseikai Toyama Hospital, Japan
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Abe Y, Chinzei T, Isoyama T, Ono T, Mochizuki S, Mabuchi K, Baba K, Matsuura H, Sun YP, Kouno A, Atsumi K, Fujimasa I, Imachi K. Development of the undulation pump total artificial heart. Artif Organs 1997; 21:665-9. [PMID: 9212936 DOI: 10.1111/j.1525-1594.1997.tb03719.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [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: 02/04/2023]
Abstract
The undulation pump is a small size continuous flow displacement type blood pump that has been developed for an artificial heart. Using undulation pumps, 2 types of implantable total artificial hearts (TAHs), the undulation pump TAH (UPTAH) type 1 (UPTAH 1) and UPTAH type 2 (UPTAH 2) were developed. Both UPTAHs were designed to be small enough to implant into the chest of a goat, the experimental animal. UPTAH 1 could be reduced in size to 75 mm in diameter and 78 mm in length. The weight was 520 g. UPTAH 2 could be reduced in size to 75 mm in diameter and 80 mm in length. The weight was 650 g. UPTAH 2 could be tested in an animal experiment using an adult female goat weighing 52.3 kg. The UPTAH 2 could be implanted successfully into the goat's chest with a good fit. The goat stood after the surgery and extubation and survived for 3 h and 40 min; thus, the potential of the UPTAH for a practical implantable TAH was demonstrated.
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Affiliation(s)
- Y Abe
- Institute of Medical Electronics, Faculty of Medicine, University of Tokyo, Japan
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43
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Abe Y, Chinzei T, Isoyama T, Ono T, Mabuchi K, Imanishi K, Kouno A, Atsumi K, Fujimasa I, Imachi K. Basic study to develop the undulation pump for practical use: antithrombogenicity, hemolysis, and flow patterns inside the pump. Artif Organs 1995; 19:691-3. [PMID: 8572975 DOI: 10.1111/j.1525-1594.1995.tb02404.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [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: 01/31/2023]
Abstract
The undulation pump (formerly called the precessional displacement pump) is a continuous flow displacement-type blood pump that is being developed as an implantable total artificial heart. A new undulation pump was developed for chronic use and was examined with animal experiment and flow visualization studies. In the animal experiment using a left ventricular bypass in goats, severe hemolysis occurred. After driving for 12 h, thrombus formation inside the pump was found. In the flow visualization studies, the flow pattern showed that the flow inside the pump was a very complicated turbulent flow. Improvement of hemolysis and thrombus formation is important to realize implantable total artificial hearts using undulation pumps.
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Affiliation(s)
- Y Abe
- Institute of Medical Electronics, Faculty of Medicine, University of Tokyo, Japan
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Sato N, Mohri H, Fujimasa I, Imachi K, Atsumi K, Sezai Y, Koyanagi H, Nitta S, Miura M. Multivariate analysis of risk factors for thrombus formation in University of Tokyo ventricular assist device. J Thorac Cardiovasc Surg 1993; 106:520-7. [PMID: 8361196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Of 77 University of Tokyo ventricular assist devices used in a total of 70 patients at 21 institutions, 13 pumps were found to have macroscopic thrombus formations. Because 19 devices that were used for less than 24 hours showed no thrombus deposition, they were considered not to have been sufficiently exposed to the thrombogenic environment for macroscopic thrombus deposition and were removed from the subsequent multivariate study. A total of eight potential risk factors were assessed in relation to thrombosis. Prevalences of thrombus formation were compared between two groups with or without each of the risk factors. In a univariate analysis, the following categoric variables were demonstrated to be significantly associated with complications, in descending order of significance: use of gabexate mesilate (protease inhibitor) as an anticoagulant (p = 0.005), normal platelet count (p = 0.010), duration of support (p = 0.038), leukocytosis (p = 0.042), and minimum pumping flow (p = 0.042). Use of heparin and the consequent increase in activated clotting time showed no relationship. Multivariate discriminant analysis, which was done to identify risk factors rejecting cross correlation between each variable, demonstrated platelet count (p = 0.006), use of gabexate mesilate (p = 0.007), and minimum flow (p = 0.008) to have significant and independent risks. These results indicate the importance of maintaining pumping flow above a certain minimum level, addition of antiplatelet drugs to the antithrombogenic regimen, and nonuse of gabexate mesitate.
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Affiliation(s)
- N Sato
- Department of Thoracic and Cardiovascular Surgery, Tohoku University School of Medicine, Sendai, Japan
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Ueda Y, Sakurai T, Kasama K, Satoh Y, Atsumi K, Hanawa S, Uchino T, Yanai A. Pharmacokinetic properties of recombinant feline interferon and its stimulatory effect on 2',5'-oligoadenylate synthetase activity in the cat. J Vet Med Sci 1993; 55:1-6. [PMID: 7681698 DOI: 10.1292/jvms.55.1] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [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: 01/26/2023] Open
Abstract
The pharmacokinetic behavior of recombinant feline interferon produced in silkworm infected with recombinant baculovirus harboring cDNA coding for feline interferon was studied in vivo in cats. The decreasing profile of the serum interferon level after intravenous administration was fitted to a two-compartment model. The half-times of the first phase (distribution phase) and second phase (metabolic phase) were 5.0 +/- 0.5 min and 31 +/- 5 min, respectively. In the whole body autoradiogram, at 15 min after the administration, the highest radioactivity was observed in urine in the bladder, and predominant radioactivity in the kidneys, liver, thyroid gland and spleen. Almost no radioactivity was detected in the brain or fat. Three hr after administration, the highest radioactivity was recorded in the thyroid gland, urine in the bladder, intestinal contents, and gastric mucous membrane. The data obtained in this study suggest that recombinant feline interferon has similar pharmacokinetic properties to human interferons and that it is distributed primarily in the liver and kidneys, is catabolized rapidly mainly in the kidneys, and is excreted in the urine without residual accumulation in the body. It was confirmed that 2',5'-oligoadenylate synthetase activity was increased by the interferon in vivo for 3 days after an intravenous bolus injection in cats.
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Affiliation(s)
- Y Ueda
- Basic Research Laboratories, TORAY Industries, Inc., Kamakura, Japan
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Imachi K, Chinzei T, Abe Y, Mabuchi K, Imanishi K, Yonezawa T, Suzuki A, Isoyama T, Atsumi K, Fujimasa I. Development of a flow-transformed pulsatile total artificial heart for total implantation. Artif Organs 1992; 16:308-13. [PMID: 10078267 DOI: 10.1111/j.1525-1594.1992.tb00318.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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: 11/30/2022]
Abstract
To realize a totally implantable total artificial heart (TAH), a new pulsatile TAH, the flow-transformed pulsatile TAH (FTPTAH), was developed. The system was composed of a single centrifugal pump (CFP) and two three-way valves. One port of each three-way valve was connected to the inlet and outlet of a CFP. The other two ports of each valve were connected to the right and left atrium, and the pulmonary artery and aorta. The CFP can perfuse the pulmonary and systemic circulation alternately with pulsatile flow by switching the two three-way valves. A prototype and the secondary model in which the solenoid valves and a spool valve were included, respectively, were connected to a mock circulatory unit with the results that a pulsatile TAH with physiological flow wave form could be obtained from a single CFP, about 5 L/min of pulsatile output could be obtained alternately on the right and left side by switching the solenoid valves or a spool valve, and flow balance between the right and left could be easily controlled by the switching duration. The system is feasible for a totally implantable TAH because it does not need a compliance chamber and can be miniaturized.
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Affiliation(s)
- K Imachi
- Institute of Medical Electronics, Faculty of Medicine, University of Tokyo, Japan
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Sakagami K, Iwamatsu K, Atsumi K, Hatanaka M. Synthetic cephalosporins. VIII. Synthesis and antibacterial activity of CP6232, a new anti-pseudomonal cephalosporin. J Antibiot (Tokyo) 1992; 45:595-8. [PMID: 1592693 DOI: 10.7164/antibiotics.45.595] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Sakagami K, Atsumi K, Yamamoto Y, Tamura A, Yoshida T, Nishihata K, Fukatsu S. Synthesis and oral activity of pivaloyloxymethyl 7-[(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3(Z)- (4-methylthiazol-5-yl)vinyl-3-cephem-4-carboxylate (ME1207) and its related compound. Chem Pharm Bull (Tokyo) 1991; 39:2433-6. [PMID: 1804557 DOI: 10.1248/cpb.39.2433] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [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: 12/28/2022]
Abstract
7-[2-(2-Aminothiazol-4-yl)-2(Z)-methoxyiminoacetamido]-3(Z)- (4-methylthiazol-5-yl)vinyl-3-cephem-4-carboxylic acid (11, ME1206) and its 3-trans isomer (13) were prepared to test antibacterial activity. These compounds exhibited excellent antibacterial activity against both gram-positive and gram-negative bacteria, including beta-lactamase producing strains. The pivaloyloxymethyl esters (12 and 14) of the compounds (11 and 13) were prepared by esterification with pivaloyloxymethyl iodide. Among them, pivaloyloxymethyl 7-[(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]- 3(Z)-(4-methylthiazol-5-yl)vinyl-3-cephem-4-carboxylate (12, ME1207) showed good urinary recovery after oral administration in mice.
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Affiliation(s)
- K Sakagami
- Pharmaceutical Research Center, Meiji Seika Kaisha, Ltd., Yokohama, Japan
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49
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Imachi K, Chinzei T, Abe Y, Mabuchi K, Imanishi K, Yonezawa T, Kouno A, Ono T, Atsumi K, Isoyama T. A new pulsatile total artificial heart using a single centrifugal pump. ASAIO Trans 1991; 37:M242-3. [PMID: 1751129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A new pulsatile total artificial heart (TAH) system, combining a single centrifugal pump (CFP) with two three-way valves, was developed. One port of each three-way valve was connected to the inlet and outlet of a CFP, respectively. The other two ports of each valve ware connected to the right and left atrium, pulmonary artery, and aorta. The CFP can perfuse the pulmonary and systemic circulation alternately with pulsatile flow. A prototype system composed of a Sarns' CFP and solenoid valves was connected to a mock circulatory system resulting in 1) a pulsatile TAH that could be produced with a single CFP, 2) 5 L/min of pulsatile output with a normal flow wave form that can be obtained alternately on the right and left side by switching the solenoid valves, and 3) flow balance between the left and the right that could be controlled easily by the length of switching duration. This new system could be miniaturized and is feasible for a totally implantable TAH.
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Affiliation(s)
- K Imachi
- Institute of Medical Electronics, Faculty of Medicine, University of Tokyo, Japan
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50
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Sakagami K, Iwamatsu K, Atsumi K, Hatanaka M. Synthetic cephalosporins. VII. Synthesis and antibacterial activity of 7-[(Z)-2-(2-aminothiazol-4-yl)-2-(3-(3-hydroxy-4-pyridon-1-yl)-3- carboxypropoxyimino)acetamido]-3-(1,2,3-thiadiazol-5-yl)-thiomethyl-3- cephem-4-carboxylic acid and its related compounds. Chem Pharm Bull (Tokyo) 1990; 38:3476-9. [PMID: 2092946 DOI: 10.1248/cpb.38.3476] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [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: 12/30/2022]
Abstract
Synthesis and antibacterial activity of 7-[(Z)-2-(2-aminothiazol-4-yl)-2-(3-(3-hydroxy-4-pyridon-1-y l)-3- carboxypropoxyimino)acetamido]-3-(1,2,3-thiadiazol-5-yl)thio methyl-3-cephem-4-carboxylic acid (12a) and its related compounds are described. Compound 12a exhibited excellent antibacterial activity against gram-negative bacteria, including Pseudomonas aeruginosa.
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Affiliation(s)
- K Sakagami
- Pharmaceutical Research Center, Meiji Seika Kaisha, Ltd., Yokohama, Japan
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