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Endoscopic Findings in Children with Isolated Lower Gastrointestinal Bleeding
Ari Silbermintz,Manar Matar,Amit Assa,Noam Zevit,Yael Mozer Glassberg,Raanan Shamir 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.3
Background/Aims: Colorectal polyps are a common cause of lower gastrointestinal bleeding in children. Our aim was to study thecauses of isolated lower gastrointestinal bleeding and to analyze the characteristics of the colorectal polyps found in our cohort. Methods: We retrospectively reviewed colonoscopic procedures performed between 2007 and 2015. Children with isolated lowergastrointestinal bleeding were included in the study. Results: A total of 185 colonoscopies were performed for isolated lower gastrointestinal bleeding. The median patient age was 8 years,and 77 patients (41.6%) were found to have colonic polyps. Normal colonoscopy findings were observed and acute colitis was detectedin 77 (41.6%) and 14 (7.4%) patients, respectively. Single colonic polyps and 2–3 polyps were detected in 73 (94.8%) and 4 (5.2%) patientswith polyps, respectively. Of the single polyps, 69 (94.5%) were juvenile polyps, among which 65 (94.2%) were located in the left colon. Conclusions: Single left-sided juvenile polyps were the most common cause of isolated lower gastrointestinal bleeding in our study. Itwas rare to find multiple polyps and polyps proximal to the splenic flexure in our cohort. A full colonoscopy is still recommended in allpatients in order to properly diagnose the small but significant group of patients with pathologies found proximal to the splenic flexure.
Appiah, Williams Agyei,Park, Joonam,Byun, Seoungwoo,Cho, Inseong,Mozer, Attila,Ryou, Myung-Hyun,Lee, Yong Min Elsevier 2018 Journal of Power Sources Vol.407 No.-
<P><B>Abstract</B></P> <P>A coupled chemo-mechanical model which considers the contact resistance as well as the influence of the attractive forces inside the contact area between the electrode and current collector was developed to evaluate the effects of the adhesive strength of a binding material on the electrochemical performance of silicon-based lithium-ion batteries. The increase in contact resistance between the electrode and current collector was introduced as a factor that reduces the electrochemical performance of the cell. The model predictions were validated with experimental data from coin-type half-cells composed of Li metal, Si electrodes, and Cu current collectors coated with binding materials with different adhesive strengths. The contact resistance increased with an increasing number of cyclic current rate. The adhesive strength decreased with cyclic current rate. The proposed model was used to investigate the effects of adhesive strength and various cell design parameters on the specific capacity of the Si-based Li-ion cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A coupled chemo-mechanical model for Si-based secondary batteries. </LI> <LI> Model parameterization and model validation. </LI> <LI> Contact resistance and adhesive strength between Si composite electrode and Cu current. </LI> <LI> Optimal electrode design for specific capacities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>