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Tomotaka Saito 3 Articles
Evaluation of the mechanical properties of current biliary self-expandable metallic stents: axial and radial force, and axial force zero border
Wataru Yamagata, Toshio Fujisawa, Takashi Sasaki, Rei Ishibashi, Tomotaka Saito, Shuntaro Yoshida, Shizuka No, Kouta Inoue, Yousuke Nakai, Naoki Sasahira, Hiroyuki Isayama
Clin Endosc 2023;56(5):633-649.   Published online April 10, 2023
DOI: https://doi.org/10.5946/ce.2022.201
Graphical AbstractGraphical Abstract AbstractAbstract PDFPubReaderePub
Background
/Aims: Mechanical properties (MPs) and axial and radial force (AF and RF) may influence the efficacy and complications of self-expandable metallic stent (SEMS) placement. We measured the MPs of various SEMSs and examined their influence on the SEMS clinical ability.
Methods
We evaluated the MPs of 29 types of 10-mm SEMSs. RF was measured using a conventional measurement device. AF was measured using the conventional and new methods, and the correlation between the methods was evaluated.
Results
A high correlation in AFs was observed, as measured by the new and conventional manual methods. AF and RF scatterplots divided the SEMSs into three subgroups according to structure: hook-and-cross-type (low AF and RF), cross-type (high AF and low RF), and laser-cut-type (intermediate AF and high RF). The hook-and-cross-type had the largest axial force zero border (>20°), followed by the laser-cut and cross types.
Conclusions
MPs were related to stent structure. Hook-and-cross-type SEMSs had a low AF and high axial force zero border and were considered safest because they caused minimal stress on the biliary wall. However, the increase in RF must be overcome.

Citations

Citations to this article as recorded by  
  • Characteristics of four commonly used self-expanding biliary stents: an in vitro study
    Jiaywei Tsauo, Yan Fu, Yue Liu, Xiaowu Zhang, He Zhao, Xiao Li
    European Radiology Experimental.2024;[Epub]     CrossRef
  • Outcomes of 6‐mm diameter fully covered self‐expandable metal stents for preoperative biliary drainage in pancreatic cancer
    Hiroki Nakagawa, Tsuyoshi Takeda, Takeshi Okamoto, Takafumi Mie, Akiyoshi Kasuga, Takashi Sasaki, Masato Ozaka, Takahisa Matsuda, Yoshinori Igarashi, Naoki Sasahira
    DEN Open.2024;[Epub]     CrossRef
  • Late-onset Rupture of the Intrahepatic Pseudoaneurysm Developed by Endoscopic Ultrasonography-guided Hepaticogastrostomy: A Case Report and Literature Review
    Tesshin Ban, Yoshimasa Kubota, Takuya Takahama, Shun Sasoh, Satoshi Tanida, Makoto Nakamura, Tomoaki Ando, Takashi Joh
    Internal Medicine.2024;[Epub]     CrossRef
  • Understanding mechanical properties of biliary metal stents for wise stent selection
    Seok Jeong
    Clinical Endoscopy.2023; 56(5): 592.     CrossRef
  • How to reduce fistula formation after self-expandable metallic stent insertion for treating malignant esophageal stricture?
    Kwang Bum Cho
    Clinical Endoscopy.2023; 56(6): 735.     CrossRef
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  • 4 Web of Science
  • 5 Crossref
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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: https://doi.org/10.5946/ce.2023.254    [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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  • 76 Download
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Endoscopic ultrasound-guided hepaticogastrostomy and endoscopic retrograde cholangiopancreatography-guided biliary drainage for distal malignant biliary obstruction due to pancreatic cancer with asymptomatic duodenal invasion
Naminatsu Takahara, Yousuke Nakai, Kensaku Noguchi, Tatsunori Suzuki, Tatsuya Sato, Ryunosuke Hakuta, Kazunaga Ishigaki, Tomotaka Saito, Tsuyoshi Hamada, Mitsuhiro Fujishiro
Received February 14, 2024  Accepted May 13, 2024  Published online June 17, 2024  
DOI: https://doi.org/10.5946/ce.2024.031
AbstractAbstract PubReaderePub
Background
/Aims: Duodenal invasion (DI) is a risk factor for early recurrent biliary obstruction (RBO) in endoscopic retrograde cholangiopancreatography-guided biliary drainage (ERCP-BD). Endoscopic ultrasound-guided hepaticogastrostomy (EUS-HGS) may reduce early RBO in cases of asymptomatic DI, even when ERCP is possible.
Methods
We enrolled 56 patients with pancreatic cancer and asymptomatic DI who underwent EUS-HGS (n=25) or ERCP-BD (n=31). Technical and clinical success, early (<3 months) and overall RBO rates, time to RBO (TRBO), and adverse events (AEs) were compared between the EUS-HGS and ERCP-BD groups. Risk factors for early RBO were also evaluated.
Results
Baseline characteristics were similar between the groups. Both procedures demonstrated 100% technical and clinical success rates, with a similar incidence of AE (48% vs. 39%, p=0.59). While the median TRBO was comparable (5.7 vs. 8.8 months, p=0.60), EUS-HGS was associated with a lower incidence of early RBO compared to ERCP-BD (8% vs. 29%, p=0.09). The major causes of early RBO in ERCP-BD were sludge and food impaction, rarely occurring in EUS-HGS. EUS-HGS was potentially reduced early RBO (odds ratio, 0.32; p=0.07).
Conclusions
EUS-HGS can be a viable option for treating pancreatic cancer with asymptomatic DI.
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