Publications by authors named "Yoshihiro Nakazato"

Percutaneous treatment of symptomatic hepatic cysts includes simple drainage and drainage with sclerosing agents. We compared the efficacy of simple drainage with that of drainage with minocycline infusion for treating symptomatic hepatic cysts. We retrospectively evaluated 11 patients who underwent percutaneous drainage of symptomatic hepatic cysts.

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Background And Aims: We aimed to clarify whether red dichromatic imaging (RDI), a new type of image-enhanced endoscopy, improves the visibility of bleeding points in acute GI bleeding (AGIB) compared with white-light imaging (WLI).

Methods: Images and videos of bleeding points acquired with WLI and RDI during endoscopic hemostasis for AGIB were retrospectively compared. In images, the color difference between bleeding points and surrounding blood was analyzed.

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Background: Red dichromatic imaging (RDI) is a novel image-enhanced endoscopy expected to improve the visibility of the bleeding point. However, it has not been thoroughly investigated.

Case Summary: A 91-year-old man developed a sudden massive hematochezia and underwent emergent colonoscopy.

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Article Synopsis
  • - The study examines a new technique for closing mucosal defects after gastric endoscopic submucosal dissection (ESD) using endo-clips, with data collected from 22 patients.
  • - Results showed complete closure was achieved in 68.2% of cases, with higher failure rates associated with larger location scores and increased closure difficulty indices.
  • - The method is deemed unreliable, particularly for patients with high closure difficulty indices, indicating a need for improved techniques in such scenarios.
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 The efficacy of complete closure versus simple closure for perforations during endoscopic submucosal dissection (ESD) has never been evaluated. We evaluated the efficacy of complete closure and simple closure for perforations and muscular layer injuries incurred during ESD. Thirty-four consecutive patients who underwent "complete closure" or "simple closure" for correction of perforations and muscular layer injuries during colorectal ESD were enrolled in this study.

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  • The study investigates trends in gastric ulcer bleeding in Japan over a decade, identifying infection and medication as key causes, with a focus on the increase in NSAIDs and antithrombotic drug use as the population ages.
  • A total of 564 patients were analyzed for factors like age, medication history, and treatment outcomes, revealing a significant rise in average patient age and a decrease in infection rates during the study period.
  • Results indicate that while NSAID and antithrombotic usage has increased among older patients, infections have decreased, with the majority of induced ulcers occurring in younger patients.
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  • A study examined the effects of daily magnesium oxide use on serum magnesium levels in patients, focusing on the risk of hypermagnesemia.
  • Out of 2,176 patients using magnesium oxide, 193 were tested for serum magnesium, finding that 16.6% had high levels and 5.2% had hypermagnesemia.
  • The research identified chronic kidney disease and high magnesium oxide dosage as key factors linked to elevated serum magnesium levels, while age did not influence these outcomes.
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  • An aortoesophageal fistula is a rare and dangerous condition that occurs when there's an abnormal connection between the aorta and the esophagus, leading to high mortality rates from upper gastrointestinal bleeding.
  • A 77-year-old man who had surgery for a ruptured abdominal aortic aneurysm experienced melena (dark, tarry stools) and was found to have an esophageal ulcer that could progress to this fistula.
  • After identifying the ulcer through an upper gastrointestinal endoscopy, he underwent thoracic endovascular aortic repair, which successfully prevented a serious complication, and his recovery was smooth thereafter.
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  • A study was conducted on patients with colonic diverticular bleeding (CDB) to identify factors affecting their hospitalization duration, as lengthy stays can negatively impact quality of life and healthcare costs.
  • It analyzed data from 223 patients, revealing that diabetes and the need for blood transfusions correlated with longer hospital stays, while urgent colonoscopy was linked to shorter stays.
  • The findings suggest that urgent colonoscopy is more effective than elective colonoscopy in reducing hospitalization time without increasing risks of complications, indicating its potential as a preferred approach in managing CDB cases when feasible.
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  • * A potential side effect of this treatment can be gastroparesis, a condition affecting stomach movement, but its occurrence and risks are not well understood.
  • * In a unique case, a patient experienced transient gastroparesis after undergoing cryoballoon ablation, but they recovered after six months with the help of medication.
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Background: Mucosal healing (MH) is proposed as a therapeutic target for ulcerative colitis (UC). Recent studies have indicated that the rate of clinical relapse in patients with a Mayo endoscopic score (MES) of 1 is higher than that of patients with an MES of 0. However, no study has yet investigated whether therapeutic intervention prevents clinical relapse in patients with an MES of 1.

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Background: The usefulness of second-generation colon capsule endoscopy (CCE-2) for ulcerative colitis (UC) has not been fully demonstrated. This study aimed to develop an endoscopic severity score of UC for CCE-2.

Methods: Patients diagnosed with UC were enrolled prospectively and underwent colonoscopy and CCE-2 on the same day.

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Background And Study Aims:  In Japan, the elderly population has been increasing annually. The number of elderly patients for whom esophagogastroduodenoscopy (EGD) and colonoscopy (CS) is indicated also has been rising. The aim of this study was to evaluate the safety and efficacy of routine endoscopy in a cohort of octogenarians aged 85 years and older - defined by the World Health Organization as the very elderly.

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Genetic lineage tracing has revealed that Lgr5 murine colon stem cells (CoSCs) rapidly proliferate at the crypt bottom. However, the spatiotemporal dynamics of human CoSCs in vivo have remained experimentally intractable. Here we established an orthotopic xenograft system for normal human colon organoids, enabling stable reconstruction of the human colon epithelium in vivo.

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Background: 5-Aminosalicylic acids (5-ASA) are effective for ulcerative colitis (UC) as a maintenance therapy. It is not clear when and how to reduce a dose of 5-ASA after inducing remission. We aimed to investigate the clinical characteristics and evaluate the risk factors of relapse for UC patients receiving 5-ASA.

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Objective We investigated whether dual-time-point 18-Fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) could improve the positive predictive value for detecting advanced colorectal neoplasms (cancer, adenoma ≥10 mm or adenoma with high-grade dysplasia). Methods We retrospectively searched for consecutive patients with a known primary cancer, who had a colonic FDG uptake incidentally found by PET/CT, followed by colonoscopy between January 2013 and August 2014. The clinical characteristics including the maximum standardized uptake value (SUVmax) were compared between advanced colorectal neoplasms and non-advanced lesions.

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 Endocytoscopy (ECS) is used in the in vivo microscopic inspection of microstructural mucosal features and enables endoscopists to assess the histological severity of ulcerative colitis (UC). The aim of this study was to assess histological healing in UC patients by using ECS.  A total of 64 patients in clinical and endoscopic remission who underwent ECS were selected.

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Background And Aims: Recent advances in endoscopic equipment and diagnostic techniques have made possible the detection of early dysplasia in the inflamed mucosa of ulcerative colitis (UC). The SCENIC consensus statement recommends the use of unified terminology for the morphology of dysplasia. In this study, we investigated the endoscopic features of high-grade dysplasia (HGD) in a clinical setting.

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Background: The ulcerative colitis endoscopic index of severity [UCEIS] is a validated scoring system. Nevertheless, few studies have investigated its usefulness in clinical settings. In this study, we aimed to predict the clinical prognosis of patients with ulcerative colitis [UC] in clinical remission using the UCEIS.

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Background: MR enterography (MRE) is useful for evaluating transmural lesions and extra-intestinal complications of Crohn's disease (CD). The aim of this study was to prospectively evaluate whether MRE could detect severe strictures and inflammatory lesions in patients who lost the responsiveness to anti-TNF treatment and whether MRE could predict prognosis of CD patients with clinical remission.

Patients And Methods: MRE were conducted in 50 patients who were treated with infliximab or adalimumab.

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Colorectal tumor is a heterogeneous disease, with varying clinical presentation and prognosis in patients. To establish a platform encompassing this diversity, we generated 55 colorectal tumor organoid lines from a range of histological subtypes and clinical stages, including rare subtypes. Each line was defined by gene expression signatures and optimized for organoid culture according to niche factor requirements.

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Background And Aim: Ulcerative colitis (UC) is a chronic inflammatory bowel disease that is characterized by periods of remission and episodes of relapse. Mucosal healing is an emerging therapeutic target in UC and various scoring systems have been used. The UC endoscopic index of severity (UCEIS) is the only validated endoscopic index at present, with minimum interobserver variation.

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