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26 results on '"Hamamoto, Wataru"'

2. Comparative Study of Endoscopic Treatment for Intrahepatic and Common Bile Duct Stones Using Peroral Cholangioscopy.

Author

Sakamoto, Yuri, Takeda, Yohei, Yamashita, Taro, Seki, Yuta, Kawahara, Shiho, Hirai, Takayuki, Suto, Noriyuki, Shimosaka, Takuya, Hamamoto, Wataru, Koda, Hiroki, Onoyama, Takumi, Matsumoto, Kazuya, Yashima, Kazuo, Isomoto, Hajime, and Yamaguchi, Naoyuki

Subjects
GALLSTONES, INTRAHEPATIC bile ducts, ENDOSCOPIC retrograde cholangiopancreatography, BILE ducts, SALINE irrigation, CHOLANGITIS
Abstract

Objectives: Although peroral cholangioscopy has improved the endoscopic treatment of difficult stones, the treatment of intrahepatic stones remains challenging. The incidence of cholangitis is high when peroral cholangioscopy is used to treat intrahepatic stones. This study aimed to investigate the efficacy and safety of endoscopic treatment with peroral cholangioscopy for intrahepatic and common bile duct stones. Methods: Patients aged ≥20 years, who underwent endoscopic treatment with peroral cholangioscopy for intrahepatic or common bile duct stones at Tottori University Hospital from January 2016 to December 2022, were retrospectively evaluated to determine the efficacy and safety of the treatment. Results: Overall, 70 patients were included in this study: 22 in the intrahepatic stone group and 48 in the common bile duct stone group. Stones were smaller (8 vs. 17.5 mm, p < 0.001) and more numerous (p = 0.016) in the intrahepatic stone group than in the common bile duct stone group. Although the common bile duct stone group exhibited a higher rate of complete stone clearance in the first session, no significant differences were observed in the final results. The intrahepatic stone group had a higher incidence of cholangitis (36% vs. 8%, p = 0.007); however, all cases were mild. Conclusions: Endoscopic treatment with peroral cholangioscopy for intrahepatic stones may be associated with a higher incidence of cholangitis than that for common bile duct stones. Since saline irrigation may contribute to the development of cholangitis, it is important to be aware of intraductal bile duct pressure when performing peroral cholangioscopy. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Partial Stent-in-Stent Method with an Uncovered Self-Expandable Metallic Stent for Unresectable Malignant Hilar Bile Duct Obstruction

Author

Shimosaka, Takuya, primary, Takeda, Yohei, additional, Yamashita, Taro, additional, Seki, Yuta, additional, Kawahara, Shiho, additional, Hirai, Takayuki, additional, Suto, Noriyuki, additional, Sakamoto, Yuri, additional, Hamamoto, Wataru, additional, Koda, Hiroki, additional, Onoyama, Takumi, additional, Matsumoto, Kazuya, additional, Yashima, Kazuo, additional, Isomoto, Hajime, additional, and Yamaguchi, Naoyuki, additional

Published
2024
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5. Pancreatic Juice Cytology Evaluations Using Synthetic Secretin and Serial Pancreatic Juice Aspiration Cytological Examination for the Diagnosis of Pancreatic Ductal Adenocarcinoma

Author

Takeda, Yohei, primary, Matsumoto, Kazuya, additional, Onoyama, Takumi, additional, Yamashita, Taro, additional, Koda, Hiroki, additional, Hamamoto, Wataru, additional, Sakamoto, Yuri, additional, Shimosaka, Takuya, additional, Kawahara, Shiho, additional, Seki, Yuta, additional, Kurumi, Hiroki, additional, Horie, Yasushi, additional, Isomoto, Hajime, additional, and Yamaguchi, Naoyuki, additional

Published
2023
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6. Comparison between Target Sample Check Illuminator and White Light Observation in Discriminating the Presence of Target Specimen for Endoscopic Ultrasound-Guided Fine Needle Aspiration Sample

Author

Koda, Hiroki, primary, Matsumoto, Kazuya, additional, Kawata, Soichiro, additional, Takeda, Yohei, additional, Onoyama, Takumi, additional, Seki, Yuta, additional, Sakamoto, Yuri, additional, Shimosaka, Takuya, additional, Hamamoto, Wataru, additional, Yamashita, Taro, additional, Kurumi, Hiroki, additional, Yamaguchi, Naoyuki, additional, Noma, Hisashi, additional, and Isomoto, Hajime, additional

Published
2023
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8. The Usefulness of Peroral Cholangioscopy for Intrahepatic Stones

Author

Sakamoto, Yuri, primary, Takeda, Yohei, additional, Seki, Yuta, additional, Kawahara, Shiho, additional, Shimosaka, Takuya, additional, Hamamoto, Wataru, additional, Koda, Hiroki, additional, Yamashita, Taro, additional, Onoyama, Takumi, additional, Matsumoto, Kazuya, additional, Yashima, Kazuo, additional, and Isomoto, Hajime, additional

Published
2022
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10. Review on acute pancreatitis attributed to COVID-19 infection

Author

Onoyama, Takumi, primary, Koda, Hiroki, additional, Hamamoto, Wataru, additional, Kawahara, Shiho, additional, Sakamoto, Yuri, additional, Yamashita, Taro, additional, Kurumi, Hiroki, additional, Kawata, Soichiro, additional, Takeda, Yohei, additional, Matsumoto, Kazuya, additional, and Isomoto, Hajime, additional

Published
2022
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11. Efficacy and Safety of Pancreatic Juice Cytology with Synthetic Secretin in Diagnosing Malignant Intraductal Papillary Mucinous Neoplasms of the Pancreas

Author

Takeda, Yohei, primary, Matsumoto, Kazuya, additional, Onoyama, Takumi, additional, Yamashita, Taro, additional, Koda, Hiroki, additional, Hamamoto, Wataru, additional, Sakamoto, Yuri, additional, Shimosaka, Takuya, additional, Kawahara, Shiho, additional, Horie, Yasushi, additional, and Isomoto, Hajime, additional

Published
2022
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12. A Case of Right Hepatic Artery Syndrome Diagnosed by Using SpyGlassDSTM System

Author

Takeda, Yohei, Onoyama, Takumi, Sakamoto, Yuri, Kawahara, Shiho, Hamamoto, Wataru, Koda, Hiroki, Yamashita, Taro, Matsumoto, Kazuya, and Isomoto, Hajime

Subjects
diagnostic imaging, extrahepatic cholestasis
Abstract

We report the case of a 68-year-old woman who had abdominal pain and slightly elevated biliary enzymes. Magnetic resonance cholangiopancreatography detected biliary duct stenosis, while contrast-enhanced magnetic resonance imaging showed that the right hepatic artery transversed the extrahepatic bile duct at the level of bifurcation of the bile duct. We performed endoscopic retrograde cholangiopancreatography and peroral cholangioscopy with the SpyGlass DS? system. Then, mild extrinsic pulsatile compression of the bile duct was observed at stricture level with an intact bile duct epithelium. Therefore, she was diagnosed with right hepatic artery syndrome and underwent cholecystectomy. Six months later, her biliary enzyme level decreased, and the recurrence of pain gradually decreased.

Published
2020

17. A Simple Method for Measuring Adenosine Triphosphate in Acute Cholangitis Patients to Determine the Need for Emergency Biliary Drainage

Author

MISHIRO, Tsuyoshi, Kishimoto Kenichi, Hamamoto Wataru, Cho Yuumi, Mikami Hironobu, Ikuta Yukihiro, Yamashita Noritsugu, MORIYAMA, Ichiro, Ishimura, Norihisa, Sato Syuichi, ISHIHARA, Shunji, Ishiguro Shingo, Kinoshita, Yoshikazu, MISHIRO, Tsuyoshi, Kishimoto Kenichi, Hamamoto Wataru, Cho Yuumi, Mikami Hironobu, Ikuta Yukihiro, Yamashita Noritsugu, MORIYAMA, Ichiro, Ishimura, Norihisa, Sato Syuichi, ISHIHARA, Shunji, Ishiguro Shingo, and Kinoshita, Yoshikazu

Published
2019

18. A Simple Method for Measuring Adenosine Triphosphate in Acute Cholangitis Patients to Determine the Need for Emergency Biliary Drainage

Author

Mishiro, Tsuyoshi, primary, Kishimoto, Kenichi, additional, Hamamoto, Wataru, additional, Cho, Yuumi, additional, Mikami, Hironobu, additional, Ikuta, Yukihiro, additional, Yamashita, Noritsugu, additional, Moriyama, Ichiro, additional, Ishimura, Norihisa, additional, Sato, Syuichi, additional, Ishihara, Shunji, additional, Ishiguro, Shingo, additional, and Kinoshita, Yoshikazu, additional

Published
2019
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21. Peroral Cholangioscopy-Guided Forceps Biopsy and Endoscopic Scraper for the Diagnosis of Indeterminate Extrahepatic Biliary Stricture

Author

Kato, Masayuki, primary, Onoyama, Takumi, additional, Takeda, Yohei, additional, Kawata, Soichiro, additional, Kurumi, Hiroki, additional, Koda, Hiroki, additional, Yamashita, Taro, additional, Hamamoto, Wataru, additional, Sakamoto, Yuri, additional, Matsumoto, Kazuya, additional, and Isomoto, Hajime, additional

Published
2019
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25. The Potential of Narrow-Band Imaging as a Novel Light Source for Photodynamic Therapy for Superficial Cancers via Endoscopes.

Author

Nakada Y, Sugihara T, Tanaka M, Hamamoto W, Kanda T, Sakaguchi T, Kurumi H, Onoyama T, Ikebuchi Y, Takata T, Isomoto H, and Yamaguchi N

Abstract

Background: Photodynamic therapy (PDT) has advanced through the utilization of photosensitizers and specific-wavelength light (≥ 600 nm). However, the widespread adoption of PDT is still impeded by high equipment costs and stringent laser safety requirements. Porphyrins, crucial in PDT, have another absorbance peak of blue light (λ = 380 - 500 nm). This peak corresponds to the wavelength of narrow-band imaging (NBI) (λ = 390 - 445 nm), an image-enhancement technology integrated into endoscopes by Olympus Medical Systems. The study aimed to investigate the potential of widely adopted NBI as a PDT light source for superficial cancers via endoscopes., Methods: Esophageal and biliary cancers were selected for investigation. Human esophageal cancer cell lines (KYSE30, KYSE70, KYSE170) and cholangiocarcinoma cell lines (HuCCT-1, KKU-213) were subjected to verteporfin-mediated PDT under NBI light (λ = 390 - 445 nm). Assessments included spectrometry, crystal violet staining, and fluorescein imaging of singlet oxygen generation and apoptosis., Results: Verteporfin exhibited a peak (λ = 436 nm) consistent with the NBI spectrum, suggesting compatibility with NBI light. NBI light significantly inhibited the growth of esophageal and biliary cancer cells. The half-maximum effective concentration (EC 50 ) values (5 J/cm 2 ) for KYSE30, KYSE70, KYSE170, HuCCT-1, and KKU-213 were calculated as 2.78 ± 0.37µM, 1.76 ± 1.20 µM, 0.77 ± 0.16 µM, 0.65 ± 0.18 µM, and 0.32 ± 0.04 µM, respectively. Verteporfin accumulation in mitochondria, coupled with singlet oxygen generation and observed apoptotic changes, suggests effective PDT under NBI light., Conclusions: NBI is a promising PDT light source for superficial cancers via endoscopes., Competing Interests: All authors have nothing to declare., (Copyright 2024, Nakada et al.)

Published
2024
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26. A Case of Right Hepatic Artery Syndrome Diagnosed by Using SpyGlassDS TM System.

Author

Takeda Y, Onoyama T, Sakamoto Y, Kawahara S, Hamamoto W, Koda H, Yamashita T, Matsumoto K, and Isomoto H

Abstract

We report the case of a 68-year-old woman who had abdominal pain and slightly elevated biliary enzymes. Magnetic resonance cholangiopancreatography detected biliary duct stenosis, while contrast-enhanced magnetic resonance imaging showed that the right hepatic artery transversed the extrahepatic bile duct at the level of bifurcation of the bile duct. We performed endoscopic retrograde cholangiopancreatography and peroral cholangioscopy with the SpyGlass DS™ system. Then, mild extrinsic pulsatile compression of the bile duct was observed at stricture level with an intact bile duct epithelium. Therefore, she was diagnosed with right hepatic artery syndrome and underwent cholecystectomy. Six months later, her biliary enzyme level decreased, and the recurrence of pain gradually decreased., Competing Interests: The authors declare no conflict of interest., (©2020 Tottori University Medical Press.)

Published
2020
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