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7 "Mamoru Takenaka"
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Drainage for fluid collections post pancreatic surgery and acute pancreatitis: similar but different?
Yousuke Nakai, Saburo Matsubara, Tsuyoshi Mukai, Tsuyoshi Hamada, Takashi Sasaki, Hirotoshi Ishiwatari, Susumu Hijioka, Hideyuki Shiomi, Mamoru Takenaka, Takuji Iwashita, Atsuhiro Masuda, Tomotaka Saito, Hiroyuki Isayama, Ichiro Yasuda, for the WONDERFUL study group in Japan
Received October 3, 2023  Accepted November 1, 2023  Published online May 17, 2024  
DOI:    [Epub ahead of print]
AbstractAbstract PDFPubReaderePub
Postoperative pancreatic fistulas (POPFs) are common adverse events that occur after pancreatic surgery. Endoscopic ultrasonography (EUS)-guided drainage (EUS-D) is a first-line treatment, similar to that for pancreatic fluid collection (PFCs) after acute pancreatitis. However, some POPFs do not develop fluid collections depending on the presence or location of the surgical drain, whereas others develop fluid collections, such as postoperative fluid collections (POPFCs). Although POPFCs are similar to PFCs, the strategy and modality for POPF management need to be modified according to the presence of fluid collections, surgical drains, and surgical type. As discussed for PFCs, the indications, timing, and selection of interventions or stents for EUS-D have not been fully elucidated for POPFs. In this review, we discuss the management of POPFs and POPFCs in comparison with PFCs due to acute pancreatitis and summarize the topics that should be addressed in future studies.
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  • 78 Download
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Role of radiofrequency ablation in advanced malignant hilar biliary obstruction
Mamoru Takenaka, Tae Hoon Lee
Clin Endosc 2023;56(2):155-163.   Published online January 16, 2023
AbstractAbstract PDFPubReaderePub
Malignant hilar biliary obstruction (MHO), an aggressive perihilar biliary obstruction caused by cholangiocarcinoma, gallbladder cancer, or other metastatic malignancies, has a poor prognosis. Surgical resection is the only curative treatment for biliary malignancies. However, the majority of patients with MHO cannot undergo surgery on presentation because of an advanced inoperable state or a poor performance state due to old age or comorbid diseases. Therefore, palliative biliary drainage is mandatory to improve symptomatic jaundice and the quality of life. Among the drainage methods, endoscopic biliary drainage is the current standard for palliation of unresectable advanced MHO. In addition, combined with endoscopic drainage, additional local ablation therapies, such as photodynamic therapy or radiofrequency ablation (RFA), have been introduced to prolong stent patency and survival. Currently, RFA is commonly used as palliative therapy, even for advanced MHO. This literature review summarizes recent studies on RFA for advanced MHO.


Citations to this article as recorded by  
  • Percutaneous endobiliary radiofrequency ablation with stent placement in type IV hilar cholangiocarcinoma: A prospective comparison with stent placement alone
    Kun Yung Kim, Chang Jin Yoon, Jae Hwan Lee, Chong-Ho Lee, Jin-Hyeok Hwang, Jaihwan Kim
    European Journal of Radiology.2024; 176: 111516.     CrossRef
  • Metastatic Cholangiocarcinoma Presenting as Colonic Obstruction
    Yianni Protopapadakis, Kevin Lamm, Joseph Baber
    ACG Case Reports Journal.2023; 10(12): e01238.     CrossRef
  • Is endoscopic radiofrequency ablation plus stent placement superior to stent placement alone for the treatment of malignant biliary obstruction? A systematic review and meta-analysis
    Chenming Liu, Jiaming Dong, Yuxing Liu, Siyuan Zhang, Ruanchang Chen, Haijun Tang
    Journal of International Medical Research.2023;[Epub]     CrossRef
  • 2,891 View
  • 248 Download
  • 2 Web of Science
  • 3 Crossref
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Usefulness of the double-guidewire technique for endoscopic procedures in the field of biliary and pancreatic diseases
Mamoru Takenaka, Masatoshi Kudo
Clin Endosc 2022;55(5):605-614.   Published online August 23, 2022
AbstractAbstract PDFPubReaderePub
The double-guidewire method has been increasingly used in endoscopic procedures for biliary and pancreatic diseases in recent years, including endoscopic retrograde cholangiopancreatography and endoscopic ultrasonography-related procedures. In addition, double-lumen catheters with uneven distal and proximal lumen openings have been introduced, making it possible to easily create a double-guidewire situation, and the usefulness of the double-guidewire technique using uneven double-lumen cannulas has been widely reported. Although the advantages of using two guidewires depend on the particular situation and the appropriate use of the two guidewires, deepening the knowledge of the double-guidewire method will contribute greatly to troubleshooting in daily practice. In this review, the usefulness of the double-guidewire technique is discussed with respect to two main areas: selective insertion of guidewires and devices and biliary cannulation.


Citations to this article as recorded by  
  • Advancements in Research on Challenges in Selective Biliary Cannulation during Endoscopic Retrograde Cholangiopancreatography (ERCP)
    天雨 张
    Journal of Clinical Personalized Medicine.2024; 03(01): 100.     CrossRef
  • Double-guidewire technique for selective biliary cannulation does not increase the rate of post-endoscopic retrograde cholangiopancreatography pancreatitis in patients with naïve papilla
    Han Taek Jeong, June Hwa Bae, Ho Gak Kim, Jimin Han
    Clinical Endoscopy.2024; 57(2): 226.     CrossRef
  • Dedicated Echoendoscope for Interventional Endoscopic Ultrasound: Comparison with a Conventional Echoendoscope
    Toshio Fujisawa, Shigeto Ishii, Yousuke Nakai, Hirofumi Kogure, Ko Tomishima, Yusuke Takasaki, Koichi Ito, Sho Takahashi, Akinori Suzuki, Hiroyuki Isayama
    Journal of Clinical Medicine.2024; 13(10): 2840.     CrossRef
    S. M. Vasyliuk, O. V. Prudnikov, V. V. Ivanyna, O. S. Tkachuk, N. M. Pavliuk, B. V. Krysa, V. M. Atamaniuk
    Kharkiv Surgical School.2022; (4-5): 55.     CrossRef
  • 2,799 View
  • 205 Download
  • 2 Web of Science
  • 4 Crossref
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Original Article
Bispectral index-guided propofol sedation during endoscopic ultrasonography
Ayana Okamoto, Ken Kamata, Takeshi Miyata, Tomoe Yoshikawa, Rei Ishikawa, Tomohiro Yamazaki, Atsushi Nakai, Shunsuke Omoto, Kosuke Minaga, Kentaro Yamao, Mamoru Takenaka, Yasutaka Chiba, Toshiharu Sakurai, Naoshi Nishida, Masayuki Kitano, Masatoshi Kudo
Clin Endosc 2022;55(4):558-563.   Published online July 12, 2022
AbstractAbstract PDFPubReaderePub
/Aims: Bispectral index (BIS) monitors process and display electroencephalographic data are used to assess the depth of anesthesia. This study retrospectively evaluated the usefulness of BIS monitoring during endoscopic ultrasonography (EUS).
This study included 725 consecutive patients who underwent EUS under sedation with propofol. BIS monitoring was used in 364 patients and was not used in 361. The following parameters were evaluated: (1) median dose of propofol; (2) respiratory and circulatory depression; (3) occurrence of body movements; (4) awakening score >8 at the time; and (5) awakening score 2 hours after leaving the endoscopy room.
The BIS group received a significantly lower median dose of propofol than the non-BIS group (159.2 mg vs. 167.5 mg; p=0.015) in all age groups. For patients aged ≥75 years, the reduction in heart rate was significantly lower in the BIS group than in the non-BIS group (1.2% vs. 9.1%; p=0.023). Moreover, the occurrence of body movements was markedly lower in the BIS group than in the non-BIS group (8.5% vs. 39.4%; p<0.001).
During EUS examination, BIS monitoring is useful for maintaining a constant depth of anesthesia, especially in patients 75 years of age or older.


Citations to this article as recorded by  
  • Advances in Analgosedation and Periprocedural Care for Gastrointestinal Endoscopy
    Sonja Skiljic, Dino Budrovac, Ana Cicvaric, Nenad Neskovic, Slavica Kvolik
    Life.2023; 13(2): 473.     CrossRef
  • Clinical and economic value of bispectral index monitoring for adequate endoscopic sedation
    Se Woo Park
    Clinical Endoscopy.2022; 55(4): 518.     CrossRef
  • Respiratory Failure during BIS-Guided Sedation in a Patient with Relapsing Polychondritis: A Case Report
    Jaesang Lee, Hosik Moon, Sungjin Hong, Jinyoung Chon, Hyejin Kwon, Hunwoo Park, Jiyung Lee
    Medicina.2022; 59(1): 65.     CrossRef
  • 3,340 View
  • 141 Download
  • 3 Web of Science
  • 3 Crossref
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Endoscopic Ultrasound Fine-Needle Biopsy May Contribute to the Diagnosis of Malignant Lymph Nodes
Mamoru Takenaka, Shunsuke Omoto, Masatoshi Kudo
Clin Endosc 2020;53(5):508-509.   Published online September 24, 2020


Citations to this article as recorded by  
  • The “echo-free space” technique: A safe and reliable method for endoscopic ultrasound scope insertion into the esophagus
    Shunsuke Omoto, Mamoru Takenaka, Kota Takashima, Yoriaki Komeda, Masatoshi Kudo
    Endoscopy.2024; 56(S 01): E500.     CrossRef
  • The “echo-free space” technique: a safe and reliable method for endoscopic ultrasound scope insertion
    Shunsuke Omoto, Mamoru Takenaka, Tomohiro Fukunaga, Kota Takashima, Yoriaki Komeda, Seok Jeong, Masatoshi Kudo
    Endoscopy.2023; 55(S 01): E698.     CrossRef
  • 3,023 View
  • 57 Download
  • 1 Web of Science
  • 2 Crossref
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Can Localized Stenosis of the Main Pancreatic Duct be a Predictive Factor for Early Detection of Pancreatic Cancer?
Mamoru Takenaka, Kentaro Yamao, Masatoshi Kudo
Clin Endosc 2019;52(6):523-524.   Published online November 29, 2019
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  • 61 Download
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