Gastric endoscopic submucosal dissection: From animal model to patient

AIM:To assess whether the use of porcine models is useful for learning endoscopic submucosal dissection(ESD),thus contributing to its subsequent application in human patients.METHODS:This study/learning process was carried out in 3 phases:PhaseⅠ:Ex vivo animal;PhaseⅡ:In vivo animal;PhaseⅢ:Humans.One endoscopist performed 30 gastric ESDs in porcine models,and later 5gastric ESDs in 5 patients.The ESD was done following the method practiced at the National Cancer Center in Tokyo,Japan.Technical aspects,size,time and speed of ESD,as well as complications were registered.In patients,their clinical,endoscopic and histologic evolution was additionally added.RESULTS:Thirty en bloc ESDs were carried out in animal models.The mean±SD size of the pieces was of28.4±1.2 mm,and the time of ESD was 41.7±2.4min.The time of ESD in the first 15 procedures was 43.0±3.0 min whereas in the next 15 procedures,the time was 40.3±3.9 min,P=0.588.The speed in the first 15ESDs was 1.25±0.11 cm2/min vs 2.12±0.36 cm2/min in the remaining 15,P=0.028.There were no complications.In patients,5 lesions were resected en bloc.The size of the pieces was 25.2±5.1 mm and the time was85.0±25.6 min.Endoscopic and histological controls did not show evidence of residual neoplastic tissue.CONCLUSION:A sequential ESD training program of a unique endoscopist,based on the practice in porcine models,contributed to learning ESD for its subsequent application in humans,yielding good results in efficacy and safety.     

新型磁力锚导引系统在内镜黏膜下剥离术中的应用:动物预实验

目的 评估新型磁力锚导引系统在猪模型内镜黏膜下剥离术（ESD）中的应用价值及安全性。方法 2名熟练ESD操作者在2只实验猪直肠进行磁力锚牵引辅助下ESD,记录分析操作时间、切除效率、完整切除率、并发症等。结果 共完成ESD操作5例,病灶开始标记至完整剥离平均时间为26.6 min,单位时间切除率（0.38±0.1）cm2/min。病灶均完整切除且无穿孔和迟发性出血发生。结论 磁力锚牵引辅助ESD能有效暴露黏膜下层,提供直视下切除,是一项安全有效的辅助技术。     

A novel device for endoscopic submucosal dissection,the Fork knife

AIM： To introduce and evaluate the efficacy and technical aspects of endoscopic submucosal dissection （ESD） using a novel device, the Fork knife. METHODS： From March 2004 to April 2008, ESD was performed on 265 gastric lesions using a Fork knife （Endo FS） （group A） and on 72 gastric lesions using a Flexknife （group B） at a single tertiary referral center. We retrospectively compared the endoscopic characteristics of the tumors, pathological findings, and sizes of the resected specimens. We also compared the en b/oc resection rate, complete resection rate, complications, and procedure time between the two groups. RESULTS： The mean size of the resected specimens was 4.27 ± 1.26 cm in group A and 4.29 ± 1.48 cm in group B. The en b/oc resection rate was 95.8% （254/265 lesions） in group A and 93.1% （67/72） in group B. Complete ESD without tumor cell invasion of the resected margin was obtained in 81.1% （215/265） of group A and in 73.6% （53/72） of group B. The perforation rate was 0.8% （2/265） in group A and 1.4% （1/72） in group B. The mean procedure time was 59.63 ± 56.12 min in group A and 76.65 ± 70.75 min in group B （P 〈 0.05）. CONCLUSION： The Fork knife （Endo FS） is useful for clinical practice and has the advantage of reducing the procedure time.     

A retrospective study of endoscopic submucosal dissection for colorectal tumors

正Objective To investigate the clinical efficacy of endoscopic submucosal dissection(ESD)for the treatment of colorectal tumors,and to analyze risk factors affecting operation time.Methods A retrospective study was conducted using data of 74 cases with colorectal tumor,who underwent ESD in the Department of Gastroenterology of Wuhan University Renmin Hospital from     

A case of hypopharyngeal cancer treated by endoscopic submucosal dissection

Recent advances in endoscopic instruments, including narrow-band imaging (NBI) and magnification endoscopy, allowed dramatic increase in the early diagnosis of hypopharyngeal cancers. In addition, endoscopic mucosal resection or endoscopic submucosal dissection has recently been used for the treatment of hypopharyngeal cancer at an early stage, especially in Japan. However, to date, there is no published report in Korea. A 68-year-old man was admitted for preoperative evaluation and treatment for known esophageal cancer initially diagnosed at a local clinic. During the evaluation, magnifying endoscopy combined with the NBI system revealed a concurrent hypopharyngeal cancer not detected by initial conventional endoscopy. In this case report, we describe for the first time in Korea a case of early stage hypopharyngeal carcinoma that was successfully treated by endoscopic submucosal dissection with a review of literature.     

Usefulness of the clip-flap method of endoscopic submucosal dissection: A randomized controlled trial

AIM To prospectively investigate the efficacy and safety of clipflap assisted endoscopic submucosal dissection(ESD) for gastric tumors.METHODS From May 2015 to October 2016, we enrolled 104 patients with gastric cancer or adenoma scheduled for ESD at Shiga University of Medical Science Hospital. We randomized patients into two subgroups using the minimization method based on location of the tumor(upper, middle or lower third of the stomach), tumor size( 20 mm or 20 mm) and ulcer status: ESD using an endoclip(the clip-flap group) and ESD without an endoclip(the conventional group). Therapeutic efficacy(procedure time) and safety(complication: Gastrointestinal bleeding and perforation) were assessed. RESULTS En bloc resection was performed in all patients. Four patients had delayed bleeding(3.8%) and two had perforation(1.9%). No significant differences in en bloc resection rate(conventional group: 100%, clip flap group: 100%), curative endoscopic resection rate(conventional group: 90.9%, clip flap group: 89.8%, P = 0.85), procedure time(conventional group: 70.8 ± 46.2 min, clip flap group: 74.7 ± 53.3 min, P = 0.69), area of resected specimen(conventional group: 884.6 ± 792.1 mm~2, clip flap group: 1006.4 ± 1004.8 mm~2, P = 0.49), delayed bleeding rate(conventional group: 5.5%, clip flap group: 2.0%, P = 0.49), or perforation rate(conventional group: 1.8%, clip flap group: 2.0%, P = 0.93) were found between the two groups. Lessexperienced endoscopists did not show any differences in procedure time between the two groups.CONCLUSION For patients with early-stage gastric tumors, the clipflap method has no advantage in efficacy or safety compared with the conventional method.     

Possibility of ex vivo animal training model for colorectal endoscopic submucosal dissection

Purpose

Colorectal endoscopic submucosal dissection (ESD) has not been standardized due to technical difficulties and requires extensive training for reliability. Ex vivo animal model is convenient, but has no blood flow. The objective of this study is to evaluate the characteristics of various ex vivo animal models including a blood flow model for colorectal ESD training and the usefulness of practicing endoscopic hemostasis and closure using an animal model.

Methods

Harvested porcine cecum, rectum, and stomach and bovine cecum and rectum were analyzed regarding ease of mucosal injection, degree of submucosal elevation, and status of the proper muscle layer. Ex vivo animal model with blood flow was made using the bovine cecum. The vessel around the cecum was detached, and red ink was injected. Endoscopic hemostasis for perioperative hemorrhage and endoscopic closure for perforation were performed in this model.

Results

Mucosal injection was easily performed in the bovine cecum and rectum. Submucosal elevation was low in the bovine cecum, while the proper muscle layer was not tight in the porcine rectum and bovine cecum. Endoscopic hemostasis were accomplished in six (60 %) out of ten procedures of the ex vivo blood flow model. In two non-experts, the completion rates of endoscopic closure were 40 and 60 % in the first five procedures. These rates became 100 % in the last five procedures.

Conclusions

We have evaluated the characteristics of various ex vivo animal models and shown the possibility of training for endoscopic hemostasis and endoscopic closure in the ex vivo animal model.     

A novel endoscopic submucosal dissection technique for proton pump inhibitor-refractory gastroesophageal reflux disease

Abstract

Objectives: Although drug treatment is the usual first-line therapy for gastroesophageal reflux disease (GERD), not all patients receive satisfactory relief from drug therapy, alone. We developed an endoscopic fundoplication technique using endoscopic submucosal dissection (ESD); the technique is referred to as ESD for GERD (ESD-G). This study investigated the safety and efficacy of this novel technique in patients with drug-refractory GERD. Patients and methods: ESD-G narrows the hiatal opening through ESD of the esophagogastric junction (EGJ) mucosa. For safety reasons, the range of mucosal resection was limited to half (1/2 or 1/4 +1/4) of the circumference of the EGJ lumen. ESD-G was performed on 13 patients with proton pump inhibitor (PPI)-refractory GERD. GERD symptoms, PPI dose, and 24-h esophageal pH monitoring results were compared before and 6 months after the procedure. Results. In 12 cases, symptoms significantly improved after ESD-G. Five patients demonstrated improved esophagitis, three were able to discontinue PPI therapy, and three were able to reduce their PPI dosage following surgery. The esophageal pH <4 holding time ratio was also decreased after ESD-G. Conclusions. ESD-G may be useful for PPI-refractory GERD patients.     

Efficient hemostatic method for endoscopic submucosal dissection of colorectal tumors

AIM:To evaluate a new hemostatic method using hemostatic forceps to prevent perforation and perioperative hemorrhage during colonic endoscopic submucosal dissection(ESD).METHODS:We studied 250 cases,in which ESD for colorectal tumors was performed at the Kyoto Prefectural University of Medicine or Nara City Hospital between 2005 and 2010.We developed a new hemostatic method using hemostatic forceps in December 2008 for the efficient treatment of submucosal thick vessels.ESD was performed on 126 cases after ...     

The pocket-creation method facilitates colonic endoscopic submucosal dissection (with video)

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