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Nishi-Tokyo-shi, Japan

Soma H.,Saitama Medical School | Murai N.,Saitama Medical School | Tanaka K.,Saitama Medical School | Oguro T.,Nihon Medical School | And 7 more authors.
Placenta | Year: 2013

This review covers four topics. 1) Placental pathology in Himalayan mountain people. To determine morphological changes of the placenta at high altitude, pathological examination was made of 1000 Himalayan placentas obtained in Nepal and Tibet and the results compared with Japanese placentas delivered at sea level. Characteristic findings in the placental villi of the Himalayan group included high incidences of villous chorangiosis and chorangioma. These processes were clarified by ultrastructural observation. 2) Placentation in Sirenians. The giant Takikawa sea cow, which lived 5 million years ago, was discovered on Hokkaido, Japan. It was an ancestor of the dugong as well as the manatees. Sirenia, the sea cow group, shares a common ancestor with Proboscidea, the elephants, even though they now inhabit quite different environments. A comparison was made of their zonary endothelial type of placentation. 3) Placentation in sharks and rays. The remarkable placentation of hammerhead sharks and manta rays is described. 4) Placentation in the Antarctic minke whale. Placental tissue samples of this whale were obtained from the Japan Institute of Cetacean Research. In an ultrastructural study of the utero-placental junction, microfilamental processes of the allantochorionic zone and crypt formation were visualized. Source


Kato K.,Kanagawa Childrens Medical Center | Tanaka M.,Kanagawa Childrens Medical Center | Toyoda Y.,Kanagawa Childrens Medical Center | Kigasawa H.,Kanagawa Childrens Medical Center | And 7 more authors.
Pathology Research and Practice | Year: 2013

Synovial sarcoma, which is difficult to diagnose precisely, is one of the most common childhood nonrhabdomyosarcoma soft-tissue sarcomas. The purpose of this study is to develop new molecular cytogenetic assay. We used two sets of two-color break-apart FISH probes, flanking either the SSX1/. SSX4 or SSX2 locus. Each set of probes is composed of differentially labeled DNA fragments complementary to sequences proximal or distal to the break point within the SSX1/. SSX4 or SSX2 locus, which are applied separately to histopathological sections. Interphase nuclei containing a translocation that disrupts either SSX1, SSX2, or SSX4 locus will display two single-color signals that have "broken apart" from each other. We applied it to two synovial sarcoma cell lines and clinical samples. This assay can detect translocation at either SSX1/. SSX4, or SSX2 locus on interphase spread prepared from synovial sarcoma cell line and histopathological sections, which is sufficient to diagnose as synovial sarcoma. Our new FISH assay has several advantages, including its applicability to paraffin-embedded samples, discrimination of the SS18- SSX1 and SS18- SSX2 translocations particularly in cases with aneuploidy, and potentially detecting translocations in all cases of synovial sarcoma, even with variant translocations. Our strategy will improve the accuracy of diagnoses, thereby facilitating appropriate treatment planning. © 2013 Elsevier GmbH. Source


Shigematsu H.,Tokyo Medical University | Yasuda K.,Hokkaido Chuo Rosai Hospital Spinal Cord Injury Center | Sasajima T.,Asahikawa University | Takano T.,Nihon Medical School | And 8 more authors.
International Angiology | Year: 2011

Aim. Hepatocyte growth factor is a potent angiogenic agent. This study investigated the efficacy and safety of intramuscular injection of naked plasmid DNA encoding the human hepatocyte growth factor gene in Japanese patients with Buerger's disease and critical limb ischemia. Methods. An open-label clinical study was performed at eight hospitals in Japan from May 2004 to April 2008. Ten patients were enrolled. They had Buerger's disease with ischemic ulcers, were not candidates for revascularization, and were unresponsive to conventional drug therapy. Treatment consisted of 8 injections (total dose: 4 mg) of hepatocyte growth factor plasmid, which were administered into the calf muscles and/or distal thigh muscles of the ischemic limbs under ultrasound guidance. Administration was done twice at an interval of 4 weeks. If there was no improvement after 2 doses, a 3rd dose could be administered. The response to treatment was evaluated from the reduction of ischemic ulcer size. Results. The size of ischemic ulcers showed a decrease in 6/9 (66.7%) patients and the ulcers healed completely in 5/9 (55.6%) patients after gene therapy. Major amputation was not required. There were no deaths and no major safety concerns. Conclusion. Hepatocyte growth factor gene therapy is safe and effective for critical limb ischemia in patients with Buerger's disease. Source


Inoue K.,Japan National Cardiovascular Center Research Institute | Murakawa Y.,Teikyo University | Nogami A.,Yokohama Rosai Hospital | Shoda M.,TokyoWomens Medical University | And 7 more authors.
Journal of Arrhythmia | Year: 2013

To assess the current status of atrial fibrillation (AF) ablation in Japan, the Japanese Heart Rhythm Society (JHRS) instituted a national registry, the Japanese Catheter Ablation Registry of AF (J-CARAF). Methods: Using an online questionnaire, the JHRS invited electrophysiology centers in Japan to voluntarily and retrospectively register data regarding the AF ablation procedures performed in September, 2011. Results: A total of 128 centers submitted data regarding AF ablation procedures in 932 patients (age 62.±10.4 years; male 76.8%; paroxysmal AF 65.7%, CHADS2 score 1.0±.0). The majority received oral anticoagulant therapy during and following the procedure (68.9% and 97.5%, respectively). Pulmonary vein isolation (PVI) was performed in 97.5% of the patients; ipsilateral encircling PVI was the preferred technique (79.7%). Three-dimensional (3D) mapping systems and irrigated-tip catheters were used in 94.8% and 87.7% of the procedures, respectively. Ablation methods other than PVI were performed in 78.8% of all the patients and 73.5% of the patients with paroxysmal AF. Acute complications were reported in 6.2% of the patients, but no early deaths were recorded. Conclusions: Ipsilateral encircling PVI, using 3D mapping and irrigated-tip catheters, is the standard AF ablation method in Japan. However, adjunctive ablations were performed frequently, even in patients with paroxysmal AF. © 2013 Japanese Heart Rhythm Society. Published by Elsevier B.V. All rights reserved. Source


Yamaguchi T.,Tokyo Dental College | Bissen-Miyajima H.,Keio University | Hori-Komai Y.,Tokyo Dental College | Matsumoto Y.,Tokyo Dental College | And 4 more authors.
Journal of Cataract and Refractive Surgery | Year: 2011

Purpose: To evaluate an outbreak of infectious keratitis after laser in situ keratomileusis (LASIK) at a single laser center in Japan. Setting: Tokyo Dental College, Chiba, Japan. Design: Case series. Methods: Relevant demographic and clinical data were obtained from case records using a standardized multicenter questionnaire at 12 major hospitals. The clinical manifestations, management, and outcomes were analyzed. Results: Thirty-nine eyes of 30 patients developed infectious keratitis after LASIK at the specified clinic. Cases of infection continued to appear over a 5-month period. The most common interval between LASIK and the onset of infection was within 2 weeks (36 eyes, 92.3%). Slitlamp manifestation included granular opacity beneath flap (71.8%), multiple infiltration (66.7%), and epithelial defect (30.8%). Mycobacterium was identified as the causative organism in 9 eyes (23.1%). In most cases, topical amikacin, arbekacin, and erythromycin in addition to fourth-generation fluoroquinolones were effective. Flap amputation was necessary in 10 eyes (25.6%) of 10 patients. Decimal visual acuity at initial presentation was worse than 0.10 in 14 eyes (35.9%), 0.15 to 0.50 in 8 eyes (20.5%), and 0.60 to 0.90 in 7 eyes (17.9%) and was better than 1.00 in 10 eyes (25.6%). Final decimal visual acuity was worse than 0.10 in 2 eyes (5.1%), 0.15 to 0.50 in 5 eyes (12.8%), and 0.60 to 0.90 in 11 eyes (28.2%) and was better than 1.00 in 21 eyes (53.8%). Conclusions: Mycobacterium was identified as the causative organism of this outbreak. This study shows the possibility of an epidemic of post-LASIK infectious keratitis. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned. © 2011 ASCRS and ESCRS. Source

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