Review Open Access
Copyright ©The Author(s) 2016. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Gastroenterol. Sep 7, 2016; 22(33): 7453-7462
Published online Sep 7, 2016. doi: 10.3748/wjg.v22.i33.7453
New devices and techniques for endoscopic closure of gastrointestinal perforations
Yue Li, Jian-Hua Wu, Yan Meng, Qiang Zhang, Wei Gong, Si-De Liu, Department of Gastroenterology, Guangdong Provincial Key Laboratory of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, Guangdong Province, China
Author contributions: Li Y drafted the article and made critical revisions related to important intellectual content of the manuscript; Wu JH and Meng Y drafted the article and acquired the data; Zhang Q and Gong W acquired and analyzed the data; Liu SD designed the research.
Supported by Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme; Guangzhou Pilot Project of Clinical and Translational Research Center, early gastrointestinal cancers, No. 7415696196402; Guangdong Provincial Bio-engineering Research Center for Gastroenterology Diseases.
Conflict-of-interest statement: The authors have no conflict of interest to report.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Correspondence to: Si-De Liu, MD, Professor, Department of Gastroenterology, Guangdong Provincial Key Laboratory of Gastroenterology, Nanfang Hospital, Southern Medical University, No. 1838, North Guangzhou Avenue, Guangzhou 510515, Guangdong Province, China. liuside2011@163.com
Telephone: +86-20-61641537 Fax: +86-20-87280770
Received: March 27, 2016
Peer-review started: March 28, 2016
First decision: May 12, 2016
Revised: May 30, 2016
Accepted: June 15, 2016
Article in press: June 15, 2016
Published online: September 7, 2016

Abstract

Gastrointestinal perforations, which need to be managed quickly, are associated with high morbidity and mortality. Treatments used to close these perforations range from surgery to endoscopic therapy. Nowadays, with the development of new devices and techniques, endoscopic therapy is becoming more popular. However, there are different indications and clinical efficacies between different methods, because of the diverse properties of endoscopic devices and techniques. Successful management also depends on other factors, such as the precise location of the perforation, its size and the length of time between the occurrence and diagnosis. In this study, we performed a comprehensive review of various devices and introduced the different techniques that are considered effective to treat gastrointestinal perforations. In addition, we focused on the different methods used to achieve successful closure, based on the literature and our clinical experiences.

Key Words: Gastrointestinal perforations, Devices, Techniques, Endoscopic closure, Treatment

Core tip: We introduce and discuss endoscopic devices and techniques used to treat gastrointestinal perforations, based on the literature and our clinical experiences. Endoscopists should avoid causing perforations, especially during therapeutic procedures. Sometimes, an intentional perforation is necessary for the complete removal of a tumor. However, the integrity of the mucosa should be considered, and the retained mucous membrane could contribute to the effective closure of the perforation after full-thickness resection. We also provide advice for choosing the appropriate method to close perforations effectively.



INTRODUCTION

Gastrointestinal perforation is defined as the presence of gas or luminal contents outside the gastrointestinal tract. In recent years, the high incidence of gastrointestinal perforations has received more and more attentions. The absolute number of perforations is likely to increase because of the widespread implementation of endoscopic screening programs and the expansion of the indications for endoscopic therapy[1]. Gastrointestinal perforations can be caused by a number of factors, such as iatrogenic factors, spontaneity, foreign body, trauma and surgery[2-4]. Among these etiologies, iatrogenic factors contribute most to the increased incidence of perforations. These iatrogenic factors include endoscopic examination, endoscopic mucosal resection (EMR), endoscopic submucosal dissection (ESD), peroral endoscopic myotomy, endoscopic retrograde cholangiopancreatography (ERCP), stricture dilation, foreign body removal and malignant tumors[2,5-9]. The incidence of iatrogenic perforations varies in diagnostic and therapeutic endoscopy, ranging from 0.029% to 5%[10,11]. With the developments of new devices and techniques, endoscopic closure has been considered as the primary method and should be a priority option compared with surgery or conservative treatments[12-14]. Endoscopic closure has advantages, such as high success rate, minimally invasion, short hospitalization and low medical expense. Based on the latest studies, endoscopic devices and techniques are considered to be a safe and effective measure to close gastrointestinal perforations[15-27]. In our previous work, we used multiple-band ligators to repair successfully a lateral duodenal ERCP-related perforation[27]. The overall rate of successful endoscopic closure has been reported as approximately 89.9%, with different devices and techniques having success rates ranging from 87.5% to 100%[4]. Many studies have described various kinds of endoscopic devices and techniques. However, there is no systematic introduction to the latest developments in devices and techniques. Recently, we reported two new techniques to close a perforation and used them successfully. In this study, we introduce and summarize different endoscopic devices and techniques based on the latest research and our previous experience. We hope to provide advice for physicians that allows them to choose the appropriate method to close perforations effectively and improve the success rate of endoscopic closure.

NEW DEVICES AND TECHNIQUES
Endoclip techniques

Clipping techniques for the endoscopic closure of gastrointestinal perforations are the most common treatment methods[11,28,29]. From treating gastrointestinal bleeding to perforations, endoscopic clips have an increasingly important role. Conventional endoscopic clips, also known as through-the scope clips (TTSC), can effectively close perforations of the esophagus, stomach, duodenum and colon[5,6,9,19,30-32]. There was no failure in three patients with esophageal perforations following EMR managed by endoclips, as reported by Shimizu et al[5]. Sekiguchi et al[33] had also reported complete endoscopic closures of gastric perforations[34,35]. Attention should be paid conservatively to those patients with a medical history of laparotomy, because closure failed in one such patient[33]. Yang et al[36] demonstrated a success rate of 95.5% with effective clipping for colonoscopy-associated perforations. When the tissues around the edge of defect were inflamed or indurated, closing the perforation using endoclips may be difficult.

A combination of clips and other devices and techniques is used common to close certain special perforations. Tanaka et al[37] applied clips and a detachable snare to close a large esophageal perforation that was difficult to manage using alone[37,38]. Using a two-channel scope, clips were placed at equal distances to fix the detachable snare around the defect. When the rubber stopper was tightened, the perforation was closed successfully[38]. Endoloop and metallic clip interrupted sutures have also been used to close gastric perforations. Shi et al[39] proved that using an endoloop and metallic clip interrupted suture to repair gastric defects resulting from endoscopic full thickness resection (EFTR) was safe, easy and feasible. The endoloop was anchored to both sides of the defect using two clips. After the maneuver was repeated sufficiently around the defect, the endoloop was tightened, closing the defect. This method proved to be safe and quick, with the only side effects being slight abdominal pain and fever in the early days of recovery.

Large mucosal defect areas usually occur during ESD. A new closure device, named the loop clip, was designed to close large mucosal defect after ESD[40]. The loop clip is anchored to the edge of the mucosal defect at the distal side, and then a normal clip is inserted and attached at the proximal side, after which the nylon loop attached to the loop clip is first grasped. The first conventional endoscopic clip is placed beside the deployed loop clip to bring the distal edge to the proximal side. Next, a second clip is placed beside the loop clip on the opposite side of the first clip. This operation is repeated until the whole defect is closed.

Over the scope clip system

Unfortunately, gastrointestinal perforations are sometimes too difficult to manage using endoclip techniques or nylon loops. The over the scope clip (OTSC) system can be more effective than TTSC in an emergency or in a complex situation. OTSC is more suitable for larger defects and is more effective for closing a fistula. The principle of OTSC system depends on its twin grasper. When the graspers are released to grasp the sides of the lesion, they are retracted completely and the perforation is closed. The advantages of OTSC system were demonstrated in the case report by Ono et al[8]. Using the OTSC system, they closed a esophageal perforation that involved esophageal stenosis. Although the OTSC system is useful to solve difficult cases, it does have certain limitations. It is hard to remove the clips once they are placed, and the grasper is not flexible enough to rotate. We usually apply the OTSC system in complex situations, for example if the perforation is large or is difficult to manage by endoclips. Recently, we closed a large perforation successfully during ESD. The submucosal tumor (SMT) was about 20 mm and originated from the deep muscularis propria layer. To remove the tumor completely, we made a full thickness resection and a large perforation occurred. OTSC and clips were then applied to achieve a successful closure (Figure 1).

Figure 1
Figure 1 Over the scope clip system and clips applied to make a successful closure. A: When endoscopic submucosal dissection (ESD) was performed for a lesion located in gastric antrum, a large perforation occurred, which was about 30 mm × 15 mm; B: The omentum majus could be seen through the perforation; C: It was difficult to make complete closure using only endoclips, and the over the scope clip (OTSC) system was applied to close the perforation. However, only partial closure was achieved because the perforation was too large; D: Eight endoclips were then used to make a complete closure.

All of these new devices and techniques have good efficacy for closing different large and complicated perforations. However, whether they can be used widely in the clinic treatment or whether further clinical studies are required remains a mater of debate.

How to choose an appropriate clipping technique to treat a perforation? Normal endoclips are suggested for use when the diameter of the perforation is less than 10-20 mm. OTCS clips are suitable to close a perforation with a diameter less than 30 mm or when the edge of mucosa is swollen and invaginating. Larger perforations can be closed effectively by a combination of clips and other devices or techniques.

In a conclusion, compared with other endoscopic devices and techniques, clipping techniques are used much more commonly to close perforations. They have become the first choice for most situations that involve closing a perforation, instead of surgery or conservative treatment[41].

Self-expanding metal and plastic stents

Recently, temporary stent placement has emerged as another endoscopic treatment for patients with perforations. There are two main types of stents with different shapes: fully covered self-expanding metal/plastic stents (fSEMS/ fSEPS) and partially covered self-expanding metal stents (pSEMS)[2,20,23,42]. Fully covered ones have the advantages of good drainage and closure of the perforation without obvious complications[23,43]. Unfortunately, they nearly all of these types of stents have a high migration rate that delays the recovery[43-45]. pSEMS have a very low migration rate compared with the fully covered ones. Nevertheless, it is a great challenge to remove them because of tissue embedding[46]. Nevertheless, they provide a further choice of method for patients and in some situations they function better than other devices and techniques when used correctly. From the literature and our clinical experiences, stents are a good choice for esophageal perforations with stenosis, where the defect’s diameter is more than 20-30 mm and there are malignant lesions around the defect. Gastric perforations near the pylorus, perforation caused by dilating an anastomotic stricture and perforation that are not close to the duodenal ampulla are suitable for stent treatment.

Kumbhari et al[20] reported that an iatrogenic pharyngoesophageal perforation was closed by fSEMS after three days. The lack of working space and risk of pulmonary aspiration made it almost impossible to apply endoscopic clips, OTSC or endoscopic suturing. This case highlighted the importance of using stents instead. Ribeiro et al[21] closed a large fistula perfectly using a combination of fibrin glue, a partially covered stent and a biological patch. Stents are much more effective for esophageal perforations, having a 100% success rate from a technical aspect. Generally speaking, when stents were used to treat upper gastrointestinal perforations, anastomotic leaks and fistulas, the success rate ranged from 65% to 88%, with different migration rates[23].

Endoscopic band ligation

Endoscopic band ligation (EBL) is one of the first-line choices for the management of gastroesophageal varices and variceal hemorrhage in cirrhosis[47]. EBL is also safe and effective to treat dieulafoy lesions and diverticular bleeding[48-50]. Furthermore, EBL is also shows promise as an effective and safe treatment for gastric small gastrointestinal stromal tumors[51-53]. In recent years, EBL has been used to close GI perforations, such as gastric, duodenal, colonic and rectal perforations. In most cases, EBL is an alternative choice to close those perforations after failure of metal clips. According to studies worldwide, perforations could be closed with a very high success rate when EBL was applied. EBL is easy, safe, quick and effective. Lee et al[26] compared the EBL technique with endoclips for the closure of colonic perforations. Closure by EBL was faster than closure by endoclipping (3.2 ± 1.7 min vs 6.8 ± 1.3 min, P < 0.01). Our group reported the successful closure of a lateral duodenal perforation by EBL after endoscopic clipping failed because of the fragile edge of the tear[27]. Although the endoscopic management of a duodenal perforation is much more difficult than the others, the patient’s perforation was closed perfectly by the EBL technique, without any symptoms after six months. We revealed that EBL might be easier and faster than endoclipping, and could be considered as the primary repair method for duodenal perforations[27].

Han et al[54] carried out a case study to evaluate the clinical efficacy and safety of EBL in gastric perforations when endoclips closure failed. Successful closures were achieved in all cases. However, the number of patients was limited and the study was not a comparative study. Han et al[55] also reported similar case studies for colon perforations and obtained the same results. Moon et al[56] also used the EBL technique to close a rectal perforation caused by ESD, with reasonably good results.

There is no doubt that new devices and techniques have limitations. EBL may prolong the hospital stay by binding together more tissue than required. In addition, it can cause injury to adjacent organs[25,26,54]. Further studies and developments are needed to expand EBL’s clinical use.

Biological glue

Among numerous tissue sealants, biological glue, a mixture of fibrinogen and thrombin, is used widely[2,3,57]. Originally, the fibrin glue was used in the area of gastroduodenal ulcer bleeding, wound healing and bleeding caused by resections of the gastrointestinal tract[58]. Fibrin glue can form a clot in vivo and can be fully reabsorbed by macrophages after approximately two weeks[59,60]. The fibrin glue can promote the growth of proliferating cells and increase the number of microvessels[61]. In addition, the use of fibrin glue induces the upregulation of growth factors’ expressions, which contribute to healing defects and stopping bleeding[61,62].

Many recent studies have verified the efficacy of biological glue to close GI defects. Kotzampassi et al[57] gained a 96.8% success rate among 63 patients with anastomotic leaks. Mutignani et al[59] obtained similar results using for fibrin glue to treat GI perforations. All six patients in his study had refractory post-ERCP bleeding and were treated with fibrin glue. The study revealed that fibrin glue might provide a new therapeutic choice to cure ERCP-related type 1 perforations after the failure of clipping techniques[59]. Biological glue is mainly applied to close fistulas and leaks. However, its use to close GI perforations has been rarely reported and deserves further exploration.

To improve the efficacy of biological glue, Doyama et al[63] adopted a treatment comprising polyglycolic acid (PGA) sheets, fibrin glue and clips. This technique solved the problems of gravitational influence on PGA and the weakness of clips to close larger defects of more than 30 mm in diameter[32]. Although biological glue seems inspiring and easy to apply, it does have disadvantages. Whether biological glue is suitable for retroperitoneal perforations and how to handle emergencies involving fibrin clot infection remain unknown. In addition, the frequent use of fibrin glue might increase surgical difficulties[59,60].

Innovative endoscopic devices for suturing

At present, there are a number of innovative endoscopic devices for suturing. The Bard EndoCinch suturing device (Davol, Cranston, RI, United States)[64] is still used commonly. However, most of the suturing devices developed in last two decades are cumbersome and expensive, and more and more physicians are searching for simple but useful suturing devices[65].

Bergström et al[65] conducted a clinical study using a new, simple stitching technique. The technique relied on two threads in the tissue on each side of a defect, and then the stitching technique locked the threads and finally the defect was closed perfectly[65-67]. It was used successfully to treat three patients with a duodenal perforation, an upper-GI vessel leak and an anastomosis leak. This technique does not need multiple and complicated devices to close the perforation and is more effective[65,66]. Nevertheless, its limitations are obvious. It takes more time to finish the operation and it is clumsy to suture in the gastric fundus, suggesting that this device needs further improvement. Moran et al[68] designed a cap-type suturing device based on natural orifice transluminal endoscopic surgery (NOTES)[69,70]. This suturing device could have a great ability to close full-thickness perforations effectively and efficiently compared with most of the other endoscopic devices[68,71,72]. The device consists mainly of a dual channel, a tissue retractor or a grasping forceps, and a detachable needle tip attached with suture material, making it easy to use. After the forceps grasp one side of the defect, the reloaded needle tip is passed through the tissue surface and then the same operation is done on the other side of the defect. When the grasping forceps are retracted, the suture ends are pulled tight to close the defect. In Moran et al[68]’s study, it was effective and universally adaptable to almost all kinds of endoscopes, providing additional suture choices. This technique requires considerable technical skill, for example, having a good command of the methods for tying a knot. Mori et al[73] performed a study on 30 excised swine stomachs to investigate properties of their innovative devices termed the double-arm-bar suturing system (DBSS). The results showed that the efficacy of DBSS was nearly equal to hand-sewn sutures. Although better efficacy was achieved in the OTSC group, according to the statistical results, DBSS performed much better at closing perforations larger than 20 mm.

Although many useful and innovative endoscopic devices for suturing have been reported, large-scale clinical applications have not yet been carried out and the long-term safety and efficacy of these devices require further evaluation.

As mentioned above, most of gastrointestinal perforations are iatrogenic and therapeutic endoscopy-related perforations are the most important factors. The integrity of the gastric mucosa is not consciously emphasized in the current endoscopic resection, which usually leads to mucosal defects and perforations. Recently, we proposed a new method, termed endoscopic mucosa-sparing lateral dissection, to remove SMTs, which not only retains an intact mucous membrane, but also provides a good operating field during the procedure. In addition, the retained mucous membrane contributed to the effective closure of the perforation after full-thickness resection for a tumor that originated from the deep layer[74]. In our experience, endoscopists should avoid perforation consciously, especially during therapeutic procedures. Sometimes, intentional perforation is necessary to completely remove the tumor. However, the integrity of the mucosa should be considered because a retained mucous membrane contributes to successful closure. To date, we have applied this method to close large perforations in four patients, and all the perforations were successfully managed (Figure 2).

Figure 2
Figure 2 Successful closure of large perforations in a patients. A: There was a submucosal tumor located in the gastric fundus, which was about 15 mm × 12 mm and originated from the deep muscularis propria; B: An intentional perforation occurred during the procedure for full-thickness resection; C: A larger perforation was left after complete removal of the tumor. However, the mucosa over the tumor was kept intact; D: We use the retained mucosa to cover the perforation and the wound was successfully covered by the intact mucosa combined with several endoclips.
CHOICES OF ENDOSCOPIC DEVICES AND TECHNIQUES IN PATIENTS WITH DIFFERENT GASTROINTESTINAL PERFORATIONS
Esophageal perforations

The European Society of Gastrointestinal Endoscopy (ESGE) suggests that endoscopic dilations, mucosal resection/submucosal dissection and foreign body removal should be considered to carry an increased risk of esophageal or gastric perforation[11]. Most esophageal perforations are iatrogenic. As mentioned above, there are many methods to close esophageal perforations. TTSC is suitable for closing defects with a diameter less than 10 mm and OTSC performs well in closing perforations with swollen and everted edges or those with a diameter less than 30 mm. In addition, esophageal stents show great advantages in handling perforations with malignant lesions or stenosis. Endoscopic devices for suturing can be applied for lesions less than 20 mm. Particular attention should be paid as follows: (1) The use of endoscopic techniques may be challenging in the proximal esophagus because of space constraints and patient intolerance; a conservative treatment should be considered in stable patients; (2) stent fixation with clip application or suturing techniques may be useful to prevent migration of the stent; and (3) fibrin glue application has been reported for the closure of esophageal perforations, but experiences are limited.

Gastric perforations

Gastric perforations are most often related to therapeutic procedures, including gastroenteric anastomosis dilation (2%)[75]; overdistension during argon plasma coagulation or cryotherapy (< 0.5%); standard snare polypectomy; EMR (0.5%) and more frequently, ESD[11,76,77]. Compared with esophageal perforations, more methods are available for closure of gastric perforations. TTSC clips alone are not recommended for perforations of more than 10 mm. In the case of perforations measuring 10-30 mm, the OTSC system has been the most evaluated and should be recommended. If the OTSC technique is unavailable, the combined technique using TTSC clips plus endoloop can be recommended. Techniques combining omental patches or nylon rope with clips are also good choices to close defect greater than 10 mm. Endoscopic suturing is required to close post-ESD defects. Stents are an option for perforations near the pylorus, or caused by dilating an anastomotic stricture. Evidence supporting the use of endoscopic band ligation for gastric perforations is scarce, and requires further exploration. Particular attention should be paid as follows: (1) most perforations of the stomach are small defects that occur during EMR, ESD procedures; (2) intentional perforation during endoscopic resection is becoming more frequent, and the integrity of the mucosa should be emphasized; (3) closing perforations in the proximal stomach might be challenging; and (4) EBL for gastric perforation closure has been reported, but experiences are limited.

Duodenal perforations

In the case of the immediate recognition of a perforation, an endoscopic closure should be attempted; however, this is effective in a minority of cases only (22%)[11]. Reports about new devices and techniques for the endoscopic closure of duodenal perforations are relatively rare. TTSC clips alone are recommended for perforations less than 10 mm. In the case of perforations measuring 10-30 mm, TTSC clips combined with endoloops or the OTSC system should be considered. EBL could be attempted when clips fail, but is not recommended routinely. If the iatrogenic perforation is diagnosed several hours after endoscopy and the patient shows symptoms of generalized peritonitis and/or sepsis, the only option is surgery. Particular attention should be paid as follows: (1) the use of a transparent cap might be helpful in difficult locations; (2) closure of medial duodenal wall defects with clips may be challenging because of the risk of clipping the ampulla and anatomic location; and (3) a nasoduodenal drain to divert pancreatic and biliary secretions may be beneficial.

Colonic perforations

ESGE recommends that complex EMR, ESD and balloon dilation procedures should be considered to carry increased risk of colorectal perforation. Risk factors include female gender, presumably related to pelvic adhesions; major co-morbidities; inflammatory bowel disease; and older age[78-81]. TTSC is suitable to close small holes and the OTSC system is useful for larger ones. Clipping plus endoloops can also close large colonic perforations. EBL is verified to be useful for this type defects, but more evidence is needed. Particular attention should be paid as follows: (1) asymptomatic patients with retroperitoneal air alone require no additional treatment; (2) the success rate of endoscopic closure is higher when the perforation is recognized and managed during the same procedure; and (3) large vertical perforations should be closed from top to bottom, and horizontal perforations should be clipped from left to right.

CONCLUSION

It is sometimes difficult to decide which device or technique is the best method for endoscopic closure of gastrointestinal perforations. In general, the decision to attempt endoscopic closure of an iatrogenic perforation depends on multiple factors, including the location, size and the cause of the perforation, the endoscopist’s experience and the accessories available at the time. The devices and techniques discussed in this study may not apply in all situations and should be interpreted in the light of specific clinical situations. With the rapid development of new endoscopic devices and techniques, more and more perforations can be managed well by endoscopy. However, more attention should be paid to avoid perforation during endoscopic procedure. Occasionally, intentional perforation is necessary to completely remove a tumor. However, the integrity of the mucosa should be considered: the retained mucous membrane can contribute to successful closure. We introduced and discussed endoscopic devices and techniques in this review, with the aim of providing more information about choosing the appropriate method to close perforations effectively and perfectly. Undoubtedly, further, large, randomized, controlled trials are needed to compare the clinical efficacies of the different endoscopic techniques in every situation.

Footnotes

Manuscript source: Invited manuscript

Specialty type: Gastroenterology and hepatology

Country of origin: South Korea

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P- Reviewer: Freeman HJ, Thandassery RB S- Editor: Ma YJ L- Editor: Stewart G E- Editor: Wang CH

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