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Fugazza A, Andreozzi M, Asadzadeh Aghdaei H, Insausti A, Spadaccini M, Colombo M, Carrara S, Terrin M, De Marco A, Franchellucci G, Khalaf K, Ketabi Moghadam P, Ferrari C, Anderloni A, Capretti G, Nappo G, Zerbi A, Repici A. Management of Malignant Gastric Outlet Obstruction: A Comprehensive Review on the Old, the Classic and the Innovative Approaches. Medicina (Kaunas) 2024; 60:638. [PMID: 38674284 PMCID: PMC11052138 DOI: 10.3390/medicina60040638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 03/31/2024] [Accepted: 04/12/2024] [Indexed: 04/28/2024]
Abstract
Gastrojejunostomy is the principal method of palliation for unresectable malignant gastric outlet obstructions (GOO). Gastrojejunostomy was traditionally performed as a surgical procedure with an open approach butrecently, notable progress in the development of minimally invasive procedures such as laparoscopic gastrojejunostomies have emerged. Additionally, advancements in endoscopic techniques, including endoscopic stenting (ES) and endoscopic ultrasound-guided gastroenterostomy (EUS-GE), are becoming more prominent. ES involves the placement of self-expandable metal stents (SEMS) to restore luminal patency. ES is commonly the first choice for patients deemed unfit for surgery or at high surgical risk. However, although ES leads to rapid improvement of symptoms, it carries limitations like higher stent dysfunction rates and the need for frequent re-interventions. Recently, EUS-GE has emerged as a potential alternative, combining the minimally invasive nature of the endoscopic approach with the long-lasting effects of a gastrojejunostomy. Having reviewed the advantages and disadvantages of these different techniques, this article aims to provide a comprehensive review regarding the management of unresectable malignant GOO.
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Affiliation(s)
- Alessandro Fugazza
- Division of Gastroenterology and Digestive Endoscopy, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy; (A.F.); (M.A.); (M.C.); (S.C.); (M.T.); (A.D.M.); (G.F.); (A.R.)
| | - Marta Andreozzi
- Division of Gastroenterology and Digestive Endoscopy, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy; (A.F.); (M.A.); (M.C.); (S.C.); (M.T.); (A.D.M.); (G.F.); (A.R.)
| | - Hamid Asadzadeh Aghdaei
- Disorders Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran P.O. Box 19875-17411, Iran;
| | - Agustin Insausti
- Department of Gastroenterology and Digestive Endoscopy, Medical Association Hospital, IGEA Institute, Patricios 347, Bahia Blanca B8000, Argentina;
| | - Marco Spadaccini
- Division of Gastroenterology and Digestive Endoscopy, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy; (A.F.); (M.A.); (M.C.); (S.C.); (M.T.); (A.D.M.); (G.F.); (A.R.)
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (G.C.); (G.N.); (A.Z.)
| | - Matteo Colombo
- Division of Gastroenterology and Digestive Endoscopy, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy; (A.F.); (M.A.); (M.C.); (S.C.); (M.T.); (A.D.M.); (G.F.); (A.R.)
| | - Silvia Carrara
- Division of Gastroenterology and Digestive Endoscopy, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy; (A.F.); (M.A.); (M.C.); (S.C.); (M.T.); (A.D.M.); (G.F.); (A.R.)
| | - Maria Terrin
- Division of Gastroenterology and Digestive Endoscopy, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy; (A.F.); (M.A.); (M.C.); (S.C.); (M.T.); (A.D.M.); (G.F.); (A.R.)
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (G.C.); (G.N.); (A.Z.)
| | - Alessandro De Marco
- Division of Gastroenterology and Digestive Endoscopy, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy; (A.F.); (M.A.); (M.C.); (S.C.); (M.T.); (A.D.M.); (G.F.); (A.R.)
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (G.C.); (G.N.); (A.Z.)
| | - Gianluca Franchellucci
- Division of Gastroenterology and Digestive Endoscopy, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy; (A.F.); (M.A.); (M.C.); (S.C.); (M.T.); (A.D.M.); (G.F.); (A.R.)
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (G.C.); (G.N.); (A.Z.)
| | - Kareem Khalaf
- Division of Gastroenterology, St. Michael’s Hospital, University of Toronto, Toronto, ON M5B 1T8, Canada;
| | - Pardis Ketabi Moghadam
- Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran P.O. Box 19875-17411, Iran;
| | - Chiara Ferrari
- Division of Anaesthesiology, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy;
| | - Andrea Anderloni
- Gastroenterology and Endoscopy Unit, Fondazione IRCCS Policlinico San Matteo, Viale Camillo Golgi 19, 27100 Pavia, Italy;
| | - Giovanni Capretti
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (G.C.); (G.N.); (A.Z.)
- Pancreatic Unit, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy
| | - Gennaro Nappo
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (G.C.); (G.N.); (A.Z.)
- Pancreatic Unit, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy
| | - Alessandro Zerbi
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (G.C.); (G.N.); (A.Z.)
- Pancreatic Unit, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy
| | - Alessandro Repici
- Division of Gastroenterology and Digestive Endoscopy, Humanitas Research Hospital-IRCCS, Via Manzoni 56, Rozzano, 20089 Milan, Italy; (A.F.); (M.A.); (M.C.); (S.C.); (M.T.); (A.D.M.); (G.F.); (A.R.)
- Department of Biomedical Sciences, Humanitas University, 20090 Milan, Italy; (G.C.); (G.N.); (A.Z.)
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Marrache MK, Itani MI, Farha J, Fayad L, Sharara SL, Kalloo AN, Khashab MA, Kumbhari V. Endoscopic gastrointestinal anastomosis: a review of established techniques. Gastrointest Endosc 2021; 93:34-46. [PMID: 32593687 DOI: 10.1016/j.gie.2020.06.057] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 06/11/2020] [Indexed: 02/08/2023]
Abstract
Technologic advancements in the field of therapeutic endoscopy have led to the development of minimally invasive techniques to create GI anastomosis without requiring surgery. Examples of the potential clinical applications include bypassing malignant and benign gastric outlet obstruction, providing access to the pancreatobiliary tree in those who have undergone Roux-en-Y gastric bypass, and relieving pancreatobiliary symptoms in afferent loop syndrome. Endoscopic GI anastomosis is less invasive and less expensive than surgical approaches, result in improved outcomes, and therefore are more appealing to patients and providers. The aim of this review is to present the evolution of luminal endoscopic gastroenteric and enteroenteric anastomosis dating back to the first compression devices and to describe the clinical techniques being used today, such as magnets, natural orifice transluminal endoscopic surgery, and EUS-guided techniques. Through continued innovation, endoscopic interventions will rise to the forefront of the therapeutic arsenal available for patients requiring GI anastomosis.
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Abstract
Endoscopic ultrasound guided gastrojejunostomy (EUS-GJ) has been mostly employed in the treatment of benign and malignant gastric outlet obstruction (GOO). Additionally, EUS-GJ has been used in the treatment of afferent loop syndrome. EUS-GJ has been employed in the treatment of benign and malignant GOO. EUS-GJ has also been used in the treatment of afferent loop syndrome. EUS-GJ involves obtaining access to the jejunum endoscopically and sonographically from the stomach, using a biflanged lumen apposing metal stent (LAMS). This is achieved through a newly formed fistulous tract. Thus creating a gastrojejunal bypass fully endoscopically. Several techniques have been described in preforming EUS-GJ but no method has been shown to be superior. In afferent loop syndrome initial data show high technical and clinical success rates and decreased need for reintervention. With malignant GOO, data available from the limited number of studies conducted demonstrated he superiority of EUS-GJ when compared to standard enteral stenting in terms of decreasing recurrence of GOO and need for reintervention. With benign GOO, EUS-GE offers a solution to the long-term patency and recurrence issue encountered with enteral stenting and endoscopic balloon dilation. EUS-GJ offers a less invasive approach than surgery for the treatment of several etiologies, giving the patients the option to avoid adverse events associated with surgery.
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Affiliation(s)
- Enad Dawod
- Weill Cornell Medicine, Department of Gastroenterology and Hepatology, New York, NY, USA
| | - Jose M Nieto
- Borland Groover Clinic, Advanced Therapeutic Endoscopy Center, Jacksonville, FL, USA
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Tyberg A, Perez-Miranda M, Sanchez-Ocaña R, Peñas I, de la Serna C, Shah J, Binmoeller K, Gaidhane M, Grimm I, Baron T, Kahaleh M. Endoscopic ultrasound-guided gastrojejunostomy with a lumen-apposing metal stent: a multicenter, international experience. Endosc Int Open 2016; 4:E276-81. [PMID: 27004243 PMCID: PMC4798937 DOI: 10.1055/s-0042-101789] [Citation(s) in RCA: 155] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 12/15/2015] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Surgical gastrojejunostomy and enteral self-expanding metal stents are efficacious for the management of gastric outlet obstruction but limited by high complication rates and short-term efficacy. Endoscopic ultrasound-guided gastrojejunostomy (EUS-GJ) is a novel alternative option. PATIENTS AND METHODS Patients who underwent EUS-GJ between March 2014 and September 2015 as part of a prospective multicenter registry at four academic centers in two countries were included. Technical success was defined as successful placement of a gastrojejunal lumen-apposing metal stent. Clinical success was defined as the ability of the patient to tolerate an oral diet. Post-procedural adverse events were recorded. RESULTS The study included 26 patients, of whom 11 (42 %) were male. Technical success was achieved in 24 patients (92 %). Clinical success was achieved in 22 patients (85 %). Of the 4 patients in whom clinical success was not achieved, 2 had persistent nausea and vomiting despite a patent EUS-GJ and required enteral feeding for nutrition, 1 died before the initiation of an oral diet, and 1 underwent surgery for suspected perforation. Adverse events, including peritonitis, bleeding, and surgery, occurred in 3 patients (11.5 %). CONCLUSION EUS-GJ is an emerging procedure that has efficacy and safety comparable with those of current therapies and should hold a place as a new minimally invasive option for patients with gastric outlet obstruction. Clinical trial identification number: NCT01522573.
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Affiliation(s)
- Amy Tyberg
- Division of Gastroenterology and Hepatology, Weill Cornell Medical College, New York, New York, USA
| | - Manuel Perez-Miranda
- Gastroenterology Department, Hospital Universitario Rio Hortega, Valladolid, Spain
| | - Ramon Sanchez-Ocaña
- Gastroenterology Department, Hospital Universitario Rio Hortega, Valladolid, Spain
| | - Irene Peñas
- Gastroenterology Department, Hospital Universitario Rio Hortega, Valladolid, Spain
| | - Carlos de la Serna
- Gastroenterology Department, Hospital Universitario Rio Hortega, Valladolid, Spain
| | - Janak Shah
- Paul May and Frank Stein Interventional Endoscopy Center, California Pacific Medical Center, San Francisco, California, USA
| | - Kenneth Binmoeller
- Paul May and Frank Stein Interventional Endoscopy Center, California Pacific Medical Center, San Francisco, California, USA
| | - Monica Gaidhane
- Division of Gastroenterology and Hepatology, Weill Cornell Medical College, New York, New York, USA
| | - Ian Grimm
- Division of Gastroenterology and Hepatology, UNC School of Medicine, Chapel Hill, North Carolina, USA
| | - Todd Baron
- Division of Gastroenterology and Hepatology, UNC School of Medicine, Chapel Hill, North Carolina, USA
| | - Michel Kahaleh
- Division of Gastroenterology and Hepatology, Weill Cornell Medical College, New York, New York, USA
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Chen SY, Shi H, Jiang SJ, Wang YG, Lin K, Xie ZF, Liu XJ. Transgastric endoscopic gastrojejunostomy using holing followed by interrupted suture technique in a porcine model. World J Gastrointest Endosc 2015; 7:1186-1190. [PMID: 26504508 PMCID: PMC4613808 DOI: 10.4253/wjge.v7.i15.1186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 07/26/2015] [Accepted: 09/21/2015] [Indexed: 02/05/2023] Open
Abstract
AIM: To demonstrate the feasibility and reproducibility of a pure natural orifice transluminal endoscopic surgery (NOTES) gastrojejunostomy using holing followed by interrupted suture technique using a single endoloop matched with a pair of clips in a non-survival porcine model.
METHODS: NOTES gastrojejunostomy was performed on three female domestic pigs as follows: Gastrostomy, selection and retrieval of a free-floating loop of the small bowel into the stomach pouch, hold and exposure of the loop in the gastric cavity using a submucosal inflation technique, execution of a gastro-jejunal mucosal-seromuscular layer approximation using holing followed by interrupted suture technique with endoloop/clips, and full-thickness incision of the loop with a Dual knife.
RESULTS: Pure NOTES side-to-side gastrojejunostomy was successfully performed in all three animals. No leakage was identified via methylene blue evaluation following surgery.
CONCLUSION: This novel technique for preforming a gastrointestinal anastomosis exclusively by NOTES is technically feasible and reproducible in an animal model but warrants further improvement.
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Ge N, Wang Z, Sun S, Wang S, Wang G, Sun S, Feng L, Yang F, Ma W, Wang S, Liu X, Guo J, Liu W. EUS assisted transmural cholecystogastrostomy fistula creation as a bridge for endoscopic internal gallbladder therapy using a novel fully covered metal stent. BMC Gastroenterol 2014; 14:164. [PMID: 25249425 PMCID: PMC4189557 DOI: 10.1186/1471-230x-14-164] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Accepted: 09/16/2014] [Indexed: 12/18/2022] Open
Abstract
Background Laparoscopic cholecystectomy (LC) has become the “gold standard” for treating symptomatic gallstones. Innovative methods, such as a scarless therapeutic procedure through a natural orifice are being introduced, and include transgastric or transcolonic endoscopic cholecystectomy. However, before clinical implementation, instruments still need modification, and a more convenient treatment is still needed. The aim of this study was to evaluate the feasibility of endoscopic internal gallbladder therapy such as cholecystolithotomy in an animal survival model. Methods Four pigs underwent endoscopic-ultrasound (EUS)-guided cholecystogastrostomy and the placement of a novel covered mental stent. Four weeks later the stents were removed and an endoscope was advanced into the gallbladder via the fistula, and cholecystolithotomy was performed. Two weeks later the pigs were sacrificed, and the healing of the fistulas was assessed. Results EUS-guided cholecystogastrostomy with mental stent deployment was successfully performed in all the animals. Four weeks after the procedure, the fistulas had formed and all the stents were removed. Endoscopic cholecystolithotomy was performed through each fistula. All the animals survived until they were sacrificed 2 weeks later. The fistulas were found to be completely healed. Conclusions This study reports the first endoscopic transmural cholecystolithotomy after placement of a novel mental stent in an animal survival model.
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Affiliation(s)
| | | | - Siyu Sun
- Endoscopy center, Shengjing Hospital, Shenyang, China.
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Vanbiervliet G, Gonzalez JM, Bonin EA, Garnier E, Giusiano S, Saint Paul MC, Berdah S, Barthet M. Gastrojejunal Anastomosis Exclusively Using the "NOTES" Technique in Live Pigs: A Feasibility and Reliability Study. Surg Innov 2013; 21:409-18. [PMID: 24253256 DOI: 10.1177/1553350613508016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
INTRODUCTION Natural orifice transluminal endoscopic surgery (NOTES) could reduce procedure-associated morbidity and mortality. The aim of this study was to determine the feasibility of performing a simple model of gastrojejunal anastomosis in a living porcine model exclusively using NOTES. METHODS It was a prospective experimental animal study concerning pigs weighing between 25 and 30 kg. Endoscopies were performed using a double-channel gastroscope. A preliminary phase allowed for the development of the technique on 3 animals that were immediately euthanized. The experimental phase included the implementation of a gastrojejunal anastomosis in 9 animals. Antibiotic therapy was continued for 7 days with gradual feeding. Surviving animals were euthanized after 3 weeks. Anastomosis permeability in each animal was confirmed by opacification, endoscopy, and histopathological analysis. The main outcome measurements were the feasibility and animal survival at 3 weeks postsurgery. RESULTS The entire procedure was performed on 9 animals (4 males and 5 females). Anastomosis required 4.7 ± 1.2 stitches (range 4-7). The average total length of the procedure was 143 ± 50.8 minutes (range 87-225 minutes). One bleeding, 2 suture dehiscences, and a poor stomach incision were the immediate complications endoscopically resolved. At 3 weeks, 5 animals had survived. Three animals died as a result of anastomotic leakage confirmed at necropsy and histopathology. In the surviving animals, histology confirmed permeable anastomoses with collagen scar tissue and continuity of the mucosa and mucosa muscle layers. CONCLUSION Successful gastrojejunal anastomosis by NOTES is technically feasible but is subject to a learning curve.
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Affiliation(s)
- Geoffroy Vanbiervliet
- University of Nice Sophia-Antipolis, Nice, France University Hospital of Nice, Nice, France Laboratoire de Biomécanique Appliquée, UMRT24 IFSTTAR/Aix-Marseille University, France
| | - Jean-Michel Gonzalez
- Laboratoire de Biomécanique Appliquée, UMRT24 IFSTTAR/Aix-Marseille University, France Public Assistance Hospitals of Marseille, Marseille, France
| | - Eduardo Aimore Bonin
- Laboratoire de Biomécanique Appliquée, UMRT24 IFSTTAR/Aix-Marseille University, France Public Assistance Hospitals of Marseille, Marseille, France
| | - Emmanuelle Garnier
- Laboratoire de Biomécanique Appliquée, UMRT24 IFSTTAR/Aix-Marseille University, France
| | - Sophie Giusiano
- Laboratoire de Biomécanique Appliquée, UMRT24 IFSTTAR/Aix-Marseille University, France Public Assistance Hospitals of Marseille, Marseille, France
| | | | - Stéphane Berdah
- Laboratoire de Biomécanique Appliquée, UMRT24 IFSTTAR/Aix-Marseille University, France Public Assistance Hospitals of Marseille, Marseille, France
| | - Marc Barthet
- Laboratoire de Biomécanique Appliquée, UMRT24 IFSTTAR/Aix-Marseille University, France Public Assistance Hospitals of Marseille, Marseille, France
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Hussain A. Upper GI natural orifice translumenal endoscopic surgery: what is new? Eur Surg 2014; 46:3-11. [DOI: 10.1007/s10353-013-0240-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sun G, Yang Y, Zhang X, Li W, Wang Y, Zhang L, Tang P, Kong J, Zhang R, Meng J, Wang X. Comparison of gastrotomy closure modalities for natural orifice transluminal surgery: a canine study. Gastrointest Endosc 2013; 77:774-83. [PMID: 23453129 DOI: 10.1016/j.gie.2012.12.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 12/17/2012] [Indexed: 02/08/2023]
Abstract
BACKGROUND Reliable closure of the gastrotomy after transgastric natural orifice transluminal endoscopic surgery (NOTES) remains unresolved. OBJECTIVE To compare the technical aspects and clinical and histologic outcomes of NOTES gastrotomy closure techniques. DESIGN Experimental study. SETTING Animal laboratory. PATIENTS Thirty-four dogs, 14 for nonsurvival study and 20 for survival study. INTERVENTIONS The animals randomly received different gastrotomy closures after NOTES: endoclip, omentoplasty, over-the-scope-clip (OTSC), and hand-suturing. MAIN OUTCOME MEASUREMENTS Procedure time, closure strength, survival, postoperative adverse events, and histologic evaluation of wound healing. RESULTS Omentoplasty and OTSC groups needed shorter procedure times and fewer clips than the endoclip group. The endoclip and omentoplasty groups generated similar leakage pressures (34.5 ± 2.6 vs 42.2 ± 4.1 mm Hg, P > .05), both lower than OTSC and hand-suturing groups (81.5 ± 2.1 and 87.0 ± 3.0 mm Hg, respectively, P < .001). Of the 20 animals in the survival study (all 4 groups), only 2 of 6 in the endoclip group were killed prematurely due to sepsis. Necropsy revealed the OTSC group reached a 100% clip retention rate, higher than the endoclip (47.9%) and omentoplasty groups (44.4%, P < .05) rates. Complete healing, defined as intact and continuous gastric layers microscopically, was seen in 83.3% of animals (5 of 6) in the omentoplasty group, comparable with OTSC (4 of 6, 66.7%, P = .500) but higher than the endoclip group (1 of 6, 16.7%, P = .04). LIMITATIONS Animal study. CONCLUSIONS Omentoplasty is easier and safer for NOTES gastrotomy closure than endoclips and offers safety profile and efficacy similar to OTSC and hand-suturing.
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Affiliation(s)
- Gang Sun
- Department of Gastroenterology and Hepatology, Chinese PLA General Hospital, Beijing, China
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