Publications by authors named "Matsunami Y"

Biliary tract cancers (BTCs), including gallbladder and bile duct cancers, have a poor prognosis. Recent advances in chemotherapy, such as using targeted drugs for specific gene mutations, have improved outcomes. Gemcitabine plus cisplatin chemotherapy has been the standard of care for the primary treatment of BTCs, but secondary treatment had not been established until recently.

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Endoscopic intraductal radiofrequency ablation (ID-RFA) can curatively treat residual intraductal lesions after endoscopic papillectomy. This study aimed to verify the tissue invasiveness of ID-RFA using a novel RF generator and to explore its appropriate settings in an animal experiment, followed by a small clinical study. Pig liver specimens were ablated using a dedicated RF catheter and two RF generators to investigate structural differences between them and the ablation effects produced under various voltage and power settings.

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Article Synopsis
  • Replacing a lumen-apposing metal stent (LAMS) with a double-pigtail plastic stent (DPS) is effective for preventing recurrence of walled-off necrosis, but traditional success rates are low; so a new technique was developed.
  • In the new method, a 7-F DPS is placed inside the LAMS to facilitate its removal while allowing granulation to occur, which stabilizes the DPS; out of 18 patients, 17 had successful replacements with no recurrences observed over 385 days.
  • Prior to this technique, replacing LAMS with DPS had a low success rate (61.8%), and recurrence of pancreatic fluid collection was noted in 15.3% of patients who could
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  • * The procedure took an average of 27.3 minutes, with significant improvement in GOO symptoms over time, achieving an overall survival rate of about 194 days post-procedure.
  • * While EPASS had a 16.2% rate of mild adverse events, it maintained 100% stent patency, emphasizing its safety and reliability for managing malignant GOO cases.
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Asano and colleagues report their method of inserting a therapeutic video duodenoscope with the use of a splinting tube for challenging cases due to deformity of the pyloric antrum. With accompanying video, they demonstrate how this technique is promising for overcoming difficulties in duodenoscope insertion caused by scope deflection.

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Tract dilation prior to stent placement is an important step in endoscopic ultrasound-guided hepaticogastrostomy. Mukai and colleagues describe their use of a novel catheter with a longer balloon, which enables one-step tract dilation of the gastric wall, liver parenchyma, and bile duct wall, shortening the procedure and reducing bile leakage.

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Bile aspiration during endoscopic ultrasound-guided hepaticogastrostomy reduces the risk of bile leakage. Mukai and colleagues devised a method in which side holes for bile aspiration are created using a biopsy punch in a hard type ultra-tapered bougie dilator. Effective bile aspiration was achieved in all four cases attempted.

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Introduction: In median arcuate ligament syndrome (MALS), the celiac artery is compressed, causing an arcade to develop in the pancreatic head, leading to ischemic symptoms and aneurysms.

Patient Concerns: The patient was diagnosed with borderline resectable pancreatic cancer (PC) and MALS. Endoscopic biliary drainage with a covered metal stent (CMS) was performed for the obstructive jaundice.

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Objectives: Endoscopic transpapillary gallbladder drainage (ETGBD) is a highly technical procedure, but few studies have evaluated factors that predict its technical success. Therefore, in this study, we sought to identify predictors of technically successful ETGBD.

Methods: One hundred and eighty-two patients who underwent ETGBD for acute cholecystitis at our hospital were retrospectively investigated.

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Article Synopsis
  • - Tonozuka and colleagues highlight a new ultra-thin peroral cholangioscope designed for challenging biliary stricture cases, featuring a tip diameter of just 2.3 mm.
  • - This innovative cholangioscope simplifies the insertion process compared to conventional scopes, easing accessibility for medical professionals.
  • - It's also cost-effective and versatile, making it a valuable tool in the field of biliary procedures.
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Transpapillary endoscopic biliary drainage is the gold standard for resolving malignant biliary obstruction. Stent migration occasionally occurs and is troublesome to retrieve. Yamamoto and colleagues report with accompanying video on the successful retrieval of a proximally migrated stent using biopsy forceps through a guiding sheath cannula.

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  • Afferent loop syndrome (ALS) is a rare complication after gastrointestinal surgery that requires prompt treatment, with various endoscopic interventions being explored for its management.
  • A study analyzed nine patients with malignant ALS who were treated using endoscopic methods like EMSP, EUS-EE, and EUS-HGS, focusing on success rates and patient outcomes.
  • Results indicated that all interventions were technically successful with no immediate adverse events, but stent dysfunction occurred in some cases, and most patients eventually died from their primary diseases.
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Background And Aims: Bilioenteric anastomotic stricture (BES) is a well-known adverse event after bilioenterostomy. Recently, EUS-guided antegrade intervention (EUS-AI) has been developed for cases that are difficult to treat by balloon enteroscopy-assisted ERCP. However, no data are available on the long-term outcomes after EUS-AI.

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  • This study investigates how different needle types and the angle of the echoendoscope affect the ease (puncturability) of inserting needles for diagnosing gastrointestinal lesions using EUS-guided techniques.
  • Researchers compared several 22-gauge fine-needle aspiration (FNA) and biopsy (FNB) needles to measure their resistance when being advanced through tissue.
  • Results showed that FNB needles had higher resistance compared to FNA needles, with SharkCore exhibiting the lowest resistance, making it the best option when a tight angle is needed during insertion.
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EUS-guided drainage using a lumen-apposing metal stent (LAMS) has demonstrated promising clinical efficacy for peripancreatic fluid collection. However, intracavitary bleeding has been reported after LAMS placement. Yamamoto et al.

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This paper discusses a novel tube placement technique; the "spinning lasso method", in EUS-guided drainage for small pancreatic pseudocysts (PC) with video. In general, the placement of a drainage tube can be difficult in a small PC and the tube often deviates during attempted insertions into the cavity. The technique helps to mitigate this problem.

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PuraStat is a novel self-assembling peptide hydrogel developed as a hemostatic agent for endoscopic and surgical procedures which can be applied to bleeding from various lesions of the gastrointestinal tract. Yamamoto and colleagues present a video showing the actual endoscopic hemostasis using PuraStat for endoscopic sphincterotomy-related bleeding.

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Highlight Interventional endoscopic ultrasound has become widely used although it remains challenging. Nagai and colleagues present the first case of single-session endoscopic ultrasound-guided hepaticogastrostomy and endoscopic ultrasound-guided pancreatic duct drainage, and demonstrate that it is feasible for the management of biliary and pancreatic duct stones in patients with surgically altered anatomy.

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Background And Objectives: Several studies have demonstrated that EUS-guided fine-needle biopsy (EUS-FNB) is useful for diagnosing gastrointestinal subepithelial lesions (GI SELs). However, there is limited evidence regarding the use of Franseen needles during EUS-FNB for patients with GI SELs. In addition, the optimal approach for diagnosing small SELs is unclear.

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High-intensity focused ultrasound (HIFU) is a novel advanced therapy for unresectable pancreatic cancer (PC). HIFU therapy with chemotherapy is being promoted as a novel method to control local advancement by tumor ablation. We evaluated the therapeutic effects of HIFU therapy in locally advanced and metastatic PC.

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