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Review : Indications for and Technical Aspects of Colorectal Endoscopic Submucosal Dissection
( Yutaka Saito ),( Yosuke Otake ),( Taku Sakamoto ),( Takeshi Nakajima ),( Masayoshi Yamada ),( Shin Haruyama ),( Eriko So ),( Seiichiro Abe ),( Takahisa Matsuda ) The Editorial Office of Gut and Liver 2013 Gut and Liver Vol.7 No.3
Due to the widespread acceptance of gastric and esophageal endoscopic submucosal dissections (ESDs), the number of medical facilities that perform colorectal ESDs has grown and the effectiveness of colorectal ESD has been increasingly reported in recent years. The clinical indications for colorectal ESD at the National Cancer Center Hospital, Tokyo, Japan include laterally spreading tumor (LST) nongranular type lesions >20 mm and LST granular type lesions >30 mm. In addition, 0-IIc lesions >20 mm, intramucosal tumors with nonlifting signs and large sessile lesions, all of which are difficult to resect en bloc by conventional endoscopic mucosal resection (EMR), represent potential candidates for colorectal ESD. Rectal carcinoid tumors less than 1 cm in diameter can be treated simply, safely, and effectively by endoscopic submucosal resection using a ligation device and are therefore not indications for ESD. The en bloc resection rate was 90%, and the curative resection rate was 87% for 806 ESDs. The median procedure time was 60 minutes, and the mean size for resected specimens was 40 mm (range, 15 to 150 mm). Perforations occurred in 23 (2.8%) cases, and postoperative bleeding occurred in 15 (1.9%) cases, but only two perforation cases required emergency surgery (0.25%). ESD was an effective procedure for treating colorectal tumors that are difficult to resect en bloc by conventional EMR. ESD resulted in a higher en bloc resection rate as well as decreased invasiveness in comparison to surgery. Based on the excellent clinical results of colorectal ESDs in Japan, the Japanese healthcare insurance system has approved colorectal ESD for coverage. (Gut Liver 2013; 7:263-269)
Computer-Assisted Rotational Acetabular Osteotomy for Patients with Acetabular Dysplasia
Yutaka Inaba,Naomi Kobayashi,Hiroyuki Ike,So Kubota,Tomoyuki Saito 대한정형외과학회 2016 Clinics in Orthopedic Surgery Vol.8 No.1
Rotational acetabular osteotomy (RAO) is a well-established surgical procedure for patients with acetabular dysplasia, and excellent long-term results have been reported. However, RAO is technically demanding and precise execution of this procedure requires experience with this surgery. The usefulness of computer navigation in RAO includes its ability to perform three-dimensional (3D) preoperative planning, enable safe osteotomy even with a poor visual field, reduce exposure to radiation from intraoperative fluoroscopy, and display the tip position of the chisel in real time, which is educationally useful as it allows staff other than the operator to follow the progress of the surgery. In our results comparing 23 hips that underwent RAO with navigation and 23 hips operated on without navigation, no significant difference in radiological assessment was observed. However, no perioperative complications were observed in the navigation group whereas one case of transient femoral nerve palsy was observed in nonnavigation group. A more accurate and safer RAO can be performed using 3D preoperative planning and intraoperative assistance with a computed tomography-based navigation system.
Comparison between Head Space Gas Sampling and Purge & Trap Sampling in Water Analysis
Nagayanagi, Yutaka,Nakagawa, Katsuhiro,Saito, Yoshihiro,Kim, Poongzag 한국분석과학회 1995 분석과학 Vol.8 No.4
The two main methods to prepare water samples for analyzing volatile organic compounds(VOC's) were investigated. One is the purge and trap(PT) method and another is the head space(HS) sampling method. Both methods were effective to transfer the low boiling point components from the water sample onto the capillary column. The cryo-focusing at the top of the main capillary column was an effective way to obtain the sharpness of the chromatographic peaks but could be avoided when a semi-wide bore column was used. The recovery from the same amount of the sample was better in PT than in HS but a larger sample volume in HS method could compensate the lower efficiency. Therefore PT is suitable to the analysis of drinking water where the very low concentration must be determined. HS is suitable to waste water analysis because of the easiness of the operation. The repeatability was good and similar in both methods. For the contamination of the former sample, both methods were tough and could be used without any problems. The matrix effect which could change the equilibrium parameters in HS method was find negligible in many components. The actual samples such as tap water and river water were analyzed with both methods concerning 16 components regulated in Korea.
Taku Sakamoto,Hourin Cho,Yutaka Saito 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.4
Considering its contribution to reducing colorectal cancer morbidity and mortality, the most important task of colonoscopy is tofind all existing polyps. Moreover, the accurate detection of existing polyps determines the risk of colorectal cancer morbidity andis an important factor in deciding the appropriate surveillance program for patients. Image-enhanced endoscopy is an easy-tousemodality with improved lesion detection. Linked color imaging (LCI) and blue laser/light imaging (BLI) are useful modalitiesfor improving colonoscopy quality. Each mode has unique optical features; therefore, their intended use differs. LCI contributes toimproved polyp detection due to its brightness and high color contrast between the lesion and normal mucosa, while BLI contributesto the characterization of detected polyps by evaluating the vessel and surface patterns of detected lesions. The proper use of theseobservation modes allows for more efficient endoscopic diagnosis. Moreover, recent developments in artificial intelligence will soonchange the clinical practice of colonoscopy and this system will provide an efficient education modality for novice endoscopists.
3D scanning based mold correction for planar and cylindrical parts in aluminum die casting
Seno, Takashi,Ohtake, Yutaka,Kikuchi, Yuji,Saito, Noriaki,Suzuki, Hiromasa,Nagai, Yukie Society for Computational Design and Engineering 2015 Journal of computational design and engineering Vol.2 No.2
Aluminum die casting is an important manufacturing process for mechanical components. Die casting is known to be more accurate than other types of casting; however, post-machining is usually necessary to achieve the required accuracy. The goal of this investigation is to develop machining- free aluminum die casting. Improvement of the accuracy of planar and cylindrical parts is expected by correcting metal molds. In the proposed method, the shape of cast aluminum made with the initial metal molds is measured by 3D scanning. The 3D scan data includes information about deformations that occur during casting. Therefore, it is possible to estimate the deformation and correction amounts by comparing 3D scan data with product computer-aided design (CAD) data. We corrected planar and cylindrical parts of the CAD data for the mold. In addition, we corrected the planar part of the metal mold using the corrected mold data. The effectiveness of the proposed method is demonstrated by evaluating the accuracy improvement of the cast aluminum made with the corrected mold.
Foxf2 represses bone formation via Wnt2b/β-catenin signaling
Tanaka Tomoyuki,Takahashi Akira,Kobayashi Yutaka,Saito Masanori,Xiaolong Sun,Jingquan Chen,Ito Yoshiaki,Kato Tsuyoshi,Ochi Hiroki,Sato Shingo,Yoshii Toshitaka,Okawa Atsushi,Carlsson Peter,Inose Hiroyu 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Differentiation of mesenchymal stem cells (MSCs) into osteoblasts is a critical process for proper skeletal development and acquisition/maintenance of bone mass. However, since this regulatory mechanism has not yet been fully elucidated, the treatment of severe osteoporosis and fractures is a challenge. Here, through a comprehensive analysis of gene expression during the differentiation of MSCs into osteoblasts, we show that the forkhead transcription factor Foxf2 is a crucial regulator of this process. Foxf2 expression transiently increased during MSC osteoblastic differentiation. Overexpression of Foxf2 in MSCs inhibited osteoblastic differentiation, and conversely, knockdown of Foxf2 expression promoted this process. Osteoprogenitor-specific Foxf2 knockout mice developed a high bone mass phenotype due to increased bone formation. RNA-seq analysis and molecular experiments revealed that Foxf2 regulation of bone formation is mediated by Wnt2b. Knockdown of Foxf2 in mouse femurs enhanced bone regeneration in vivo. FOXF2 expression was correlated with hip bone mineral density in postmenopausal women with low bone mass. Finally, inhibition of FOXF2 promoted osteoblastic differentiation of human MSCs. This study uncovers a critical role of Foxf2 in the differentiation of MSCs into osteoblasts and provides insight into the pathogenesis associated with bone-related diseases such as osteoporosis and nonunion after fracture
Post-polypectomy surveillance: the present and the future
Masau Sekiguchi,Takahisa Matsuda,Kinichi Hotta,Yutaka Saito 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.4
An appropriate post-polypectomy surveillance program requires the effectiveness of reducing colorectal cancer and safety. In addition,the post-polypectomy surveillance program should consider the burden of limited medical resource capacity, cost-effectiveness, andpatient adherence. In this sense, a risk-stratified surveillance program based on baseline colonoscopy results is ideal. Major internationalguidelines for post-polypectomy surveillance, such as those from the European Union and the United States, have recommendedrisk-stratified surveillance programs. Both guidelines have recently been updated to better differentiate between high- and low-risk individuals. In both updated guidelines, more individuals have been downgraded to lower-risk groups that require less frequent or nosurveillance. Furthermore, increased attention has been paid to the surveillance of patients who undergo serrated polyp removal. Previousguidelines in Japan did not clearly outline the risk stratification in post-polypectomy surveillance. However, the new colonoscopyscreening and surveillance guidelines presented by the Japan Gastroenterological Endoscopy Society include a risk-stratifiedpost-polectomy surveillance program. Further discussion and analysis of unresolved issues in this field, such as the optimal follow-upafter the first surveillance, the upper age limit for surveillance, and the ideal method for improving adherence to surveillance guidelines,are warranted.