Peroral endoscopic myotomy (POEM) for esophageal achalasia

Evolution of the minimally invasive treatment of esophageal achalasia

Thanks to the advent of laparoscopic techniques, the last decade and a half have witnessed a radical change in the treatment of esophageal achalasia. Because of the high success rate of the laparoscopic Heller myotomy, surgery has now become in many centers the first modality of treatment for achalasia. This shift in the treatment algorithm reflects the fact that laparoscopic Heller myotomy with partial fundoplication outperforms nonsurgical approaches, such as balloon dilatation and intrasphincteric botulinum toxin injection.

Evolution of the minimally invasive treatment of esophageal achalasia

Thanks to the advent of laparoscopic techniques, the last decade and a half have witnessed a radical change in the treatment of esophageal achalasia. Because of the high success rate of the laparoscopic Heller myotomy, surgery has now become in many centers the first modality of treatment for achalasia. This shift in the treatment algorithm reflects the fact that laparoscopic Heller myotomy with partial fundoplication outperforms nonsurgical approaches, such as balloon dilatation and intrasphincteric botulinum toxin injection.

A stepwise approach and early clinical experience in peroral endoscopic myotomy for the treatment of achalasia and esophageal motility disorders

BACKGROUND

Peroral endoscopic myotomy (POEM) has recently been described in humans as a treatment for achalasia. This concept has evolved from developments in natural orifice translumenal endoscopic surgery (NOTES) and has the potential to become an important therapeutic option. We describe our approach as well as our initial clinical experience as part of an ongoing study treating achalasia patients with POEM.

STUDY DESIGN

Five patients (mean age 64 ± 11 years) with esophageal motility disorders were enrolled in an IRB-approved study and underwent POEM. This completely endoscopic procedure involved a midesophageal mucosal incision, a submucosal tunnel onto the gastric cardia, and selective division of the circular and sling fibers at the lower esophageal sphincter. The mucosal entry was closed by conventional hemostatic clips. All patients had postoperative esophagograms before discharge and initial clinical follow-up 2 weeks postoperatively.

RESULTS

All (5 of 5) patients successfully underwent POEM treatment, and the myotomy had a median length of 7 cm (range 6 to 12 cm). After the procedure, smooth passage of the endoscope through the gastroesophageal junction was observed in all patients. Operative time ranged from 120 to 240 minutes. No leaks were detected in the swallow studies and mean length of stay was 1.2 ± 0.4 days. No clinical complications were observed, and at the initial follow-up, all patients reported dysphagia relief without reflux symptoms.

CONCLUSIONS

Our initial experience with the POEM procedure demonstrates its operative safety, and early clinical results have shown good results. Although further evaluation and long-term data are mandatory, POEM could become the treatment of choice for symptomatic achalasia.

Current approach to the treatment of achalasia

Achalasia is a primary esophageal motility disorder characterized by aperistalsis and incomplete or absent relaxation of the lower esophageal sphincter (LES). The cause of the disease remains elusive and there is no intervention that improves the esophageal body function. Currently, treatment options focus on palliation of symptoms by reducing the LES pressure. The most effective and well-tolerated treatments continue to be the laparoscopic Heller myotomy and endoscopic pneumatic dilation; however, newer techniques (eg, peroral endoscopic myotomy and self-expanding metal stents) show promise. Botulinum toxin and pharmacologic therapy are reserved for those who are unable to undergo more effective therapies. Treatment options should be tailored to the patient, using current predictors of outcome such as the patient's age and post-treatment LES pressures. The aim of this article is to highlight current literature and provide an up-to-date approach to the treatment of achalasia.

Critical analysis of hot topics in NOTES

Natural orifice transluminal endoscopic surgery (NOTES) has gained a great deal of attention from gastroenterologists and surgeons all over the world since its introduction in 2000. The field of NOTES has advanced tremendously since that time and exciting and well-designed research has been reported. Both randomized controlled trials and results from large national and international registries have been published. Many experimental and clinical studies have discussed transesophageal, transgastric, transvaginal and transrectal access for a variety of NOTES procedures. Transvaginal access has been the most frequently reported NOTES access route in clinical trials. When suitable instruments become available, a true comparison of NOTES with current laparoscopic approaches can be realized.

Clinical applications of submucosal endoscopy

PURPOSE OF REVIEW

Submucosal endoscopy with mucosal flap (SEMF), a new diagnostic and therapeutic intervention of flexible endoscopy, has been examined from the perspective of developmental laboratory work, procedural details, and results of early clinical experiences.

RECENT FINDINGS

Diagnostic natural orifice translumenal endoscopic surgery (NOTES) procedures, endolumenal achalasia myotomy, and submucosal tumor excision have been clinically performed with a SEMF method. The outcomes of these procedures were equivalent to standard surgery but with reduced morbidity. Some were accomplished under conscious sedation within the endoscopy unit.

SUMMARY

The SEMF procedure was originally developed to provide safe access to the peritoneal cavity for NOTES procedures. In the SEMF method, the submucosal layer is endoscopically tunneled and the resultant space is used as an endoscopic path into deeper layers of the gut wall and an offset exit to the peritoneal cavity. Key to the method is the overlying mucosa which serves as a sealant flap minimizing the risk of soiling a body cavity with lumenal contents and the ease by which the entry point into the submucosal working space can be closed. Positive outcomes of the early SEMF clinical experiences validate that the submucosa can be transformed into a promising novel working space for flexible endoscopy.

Feasibility and safety of endoscopic transesophageal access and closure using a Maryland dissector and a self-expanding metal stent

BACKGROUND

Secure access and reliable closure is paramount in the setting of transesophageal mediastinal endoscopic surgery. The purpose of this study was to develop a secure transesophageal access technique and to evaluate the feasibility, safety, and efficacy of a novel covered, self-expanding, retractable stent for closure of 15-mm esophageal defects.

METHODS

Fifteen-millimeter esophagotomies were created in 18 domestic pigs using needle knife puncture and balloon dilatation or a blunt dissection technique. Six animals were randomly assigned to open surgical repair and six animals to endoscopic closure using a self-expanding, covered, nitinol stent (Danis SX-ELLA stent, ELLA-CS) in a nonsurvival setting. Pressurized leak tests were performed on all closures. Six animals underwent transesophageal endoscopic mediastinal interventions and survived for 17 days. Stents were extracted at day 10.

RESULTS

Nonsurvival experiments revealed two bleeding complications associated with the needle-knife access technique, while blunt-dissection mediastinal access was not associated with any complications. Leak test results were not different for stent compared to surgical closures. All survival animals were found to have complete closure and adequate healing of the esophagotomies. No leakage or infectious complication occurred.

CONCLUSION

Blunt dissection achieves safe access into the mediastinum. Stent closure achieves similar leak test results compared to surgical closure and results in adequate sealing and wound healing of 15-mm esophageal defects.

Treatment and surveillance strategies in achalasia: an update

Controversy exists with regard to the optimal treatment for achalasia and whether surveillance for early recognition of late complications is indicated. Currently, surgical myotomy and pneumatic dilation are the most effective treatments for patients with idiopathic achalasia, and a multicenter, randomized, international trial has confirmed similar efficacy of these treatments, at least in the short term. Clinical predictors of outcome, patient preferences and local expertise should be considered when making a decision on the most appropriate treatment option. Owing to a lack of long-term benefit, endoscopic botulinum toxin injection and medical therapies are reserved for patients of advanced age and those with clinically significant comorbidites. The value of new endoscopic, radiologic or surgical treatments, such as peroral endoscopic myotomy, esophageal stenting and robotic-assisted myotomy has not been fully established. Finally, long-term follow-up data in patients with achalasia support the notion that surveillance strategies might be beneficial after a disease duration of more than 10-15 years.

Natural orifice translumenal endoscopic surgery (NOTES(®)): a technical review

INTRODUCTION

The clinical NOTES literature continues to grow. This review quantifies the published human NOTES experience to date, examines instrument use in detail, and compiles available perioperative outcomes data.

METHODS

A PubMed search for all articles describing human NOTES cases was performed. All articles providing a technical description of procedures, excluding cases limited to diagnostic procedures, specimen extraction, fluid drainage or gynecological procedures, were reviewed. Two reviewers systematically cataloged the technical details of each procedure and performed a frequency analysis of instrument use in each type of case. Available outcomes data were also compiled.

RESULTS

Forty-three discrete articles were reviewed in detail, describing a total of 432 operations consisting of transvaginal (n = 355), transgastric (n = 58), transesophageal (n = 17), and transrectal (n = 2) procedures, with 90% of cases performed in hybrid fashion with laparoscopic assistance. Cholecystectomy (84% of cases) was the most common procedure. Analysis of key steps included choice of endoscope, establishment of peritoneal access, dissection, specimen extraction, and closure of the access site. Analysis of instrument use during transvaginal cholecystectomy revealed variation in the choice of endoscope and the technique for establishment of access. A majority of these procedures relied heavily on the use of rigid and transabdominal instrumentation. Closure of the vaginotomy site was found to be well standardized, performed with an open suturing technique. Similar analysis for transgastric procedures revealed consistency in the choice of flexible endoscope as well as access and closure techniques. Perioperative outcomes from NOTES procedures were reported, but the data are currently limited due to small case numbers.

CONCLUSIONS

NOTES is most commonly performed using a hybrid, transvaginal approach. Although some aspects of these procedures appear to be well standardized, there is still significant variability in technique. More outcomes data with standardized reporting are needed to determine the actual risks and benefits of NOTES.

Natural orifice translumenal endoscopic surgery (NOTES(®)): a technical review

INTRODUCTION

The clinical NOTES literature continues to grow. This review quantifies the published human NOTES experience to date, examines instrument use in detail, and compiles available perioperative outcomes data.

METHODS

A PubMed search for all articles describing human NOTES cases was performed. All articles providing a technical description of procedures, excluding cases limited to diagnostic procedures, specimen extraction, fluid drainage or gynecological procedures, were reviewed. Two reviewers systematically cataloged the technical details of each procedure and performed a frequency analysis of instrument use in each type of case. Available outcomes data were also compiled.

RESULTS

Forty-three discrete articles were reviewed in detail, describing a total of 432 operations consisting of transvaginal (n = 355), transgastric (n = 58), transesophageal (n = 17), and transrectal (n = 2) procedures, with 90% of cases performed in hybrid fashion with laparoscopic assistance. Cholecystectomy (84% of cases) was the most common procedure. Analysis of key steps included choice of endoscope, establishment of peritoneal access, dissection, specimen extraction, and closure of the access site. Analysis of instrument use during transvaginal cholecystectomy revealed variation in the choice of endoscope and the technique for establishment of access. A majority of these procedures relied heavily on the use of rigid and transabdominal instrumentation. Closure of the vaginotomy site was found to be well standardized, performed with an open suturing technique. Similar analysis for transgastric procedures revealed consistency in the choice of flexible endoscope as well as access and closure techniques. Perioperative outcomes from NOTES procedures were reported, but the data are currently limited due to small case numbers.

CONCLUSIONS

NOTES is most commonly performed using a hybrid, transvaginal approach. Although some aspects of these procedures appear to be well standardized, there is still significant variability in technique. More outcomes data with standardized reporting are needed to determine the actual risks and benefits of NOTES.

Reliability of gastric access closure with the self-approximating transluminal access technique (STAT) for NOTES

BACKGROUND

STAT, or the self-approximating transluminal access technique, has been previously described and involves the dissection of a submucosal tunnel for peritoneal or mediastinal access from the esophagus and stomach. The objective of this study was to assess the safety and reliability of gastric access and closure in a porcine experience using STAT for natural orifice transluminal endoscopic surgery (NOTES).

METHODS

A review of the experience using STAT access tunnels for intraperitoneal access was performed in 39 female pigs at a university animal lab. All animals underwent a predetermined NOTES surgical procedure using a STAT transgastric access tunnel based on a specific protocol. Details of the procedure, complications, and clinical course were documented. Necropsy was performed at 2 weeks. The main outcome measurements were clinical or necropsy evidence of gastrostomy site leak or inadequate access site closure.

RESULTS

STAT was successful in providing safe peritoneal access in all animals. The width of the tunnel ranged from 1.5 to 5.5 cm and the length was up to 27 cm. There was no evidence of gastrostomy site leak in any animals. One animal required a single laparoscopic suture to help with tunnel closure.

CONCLUSION

STAT provides safe transgastric access and allows secure closure of the gastrotomy site.

Natural orifice translumenal endoscopic surgery: Progress in humans since white paper

Since the first description of the concept of natural orifice translumenal endoscopic surgery (NOTES), a substantial number of clinical NOTES reports have appeared in the literature. This editorial reviews the available human data addressing research questions originally proposed by the white paper, including determining the optimal method of access for NOTES, developing safe methods of lumenal closure, suturing and anastomotic devices, advanced multitasking platforms, addressing the risk of infection, managing complications, addressing challenges with visualization, and training for NOTES procedures. An analysis of the literature reveals that so far transvaginal access and closure appear to be the most feasible techniques for NOTES, with a limited, but growing transgastric, transrectal, and transesophageal NOTES experience in humans. The theoretically increased risk of infection as a result of NOTES procedures has not been substantiated in transvaginal and transgastric procedures so far. Development of suturing and anastomotic devices and advanced platforms for NOTES has progressed slowly, with limited clinical data on their use so far. Data on the optimal management and incidence of intraoperative complications remain sparse, although possible factors contributing to complications are discussed. Finally, this editorial discusses the likely direction of future NOTES development and its possible role in clinical practice.

Management of achalasia

Several theories on the etiology and pathophysiology of achalasia have been reported but, to date, it is widely accepted that loss of peristalsis and absence of swallow-induced relaxation of the lower esophageal sphincter are the main functional abnormalities. Treatment of achalasia often aims to alleviate the symptoms of achalasia and not to correct the underlying disorder. Medical therapy has poor efficacy, so patients who are good surgical candidates should be offered either laparoscopic myotomy or pneumatic balloon dilatation. Their own preference should be included in the decision-making process, and treatment should meet the local expertise with these procedures. Laparoscopic surgical esophagomyotomy is a safe and effective modality. It can be considered as initial management or as secondary treatment if the patient does not respond to less invasive modalities. Pneumatic dilatation has proven to be a safe, effective, and durable modality of treatment when performed by experienced individuals, and appears to be the most cost-effective alternative. For patients with multiple comorbidities and for elderly patients, who are not good surgical candidates, endoscopic injection of botulinum toxin should be considered a safe and effective procedure. However, its positive effect diminishes over time, and the need for multiple repeated sessions must be taken into consideration. In the management of patients with achalasia, nutritional aspects play an important role. When lifestyle changes are insufficient, it is necessary to proceed to percutaneous gastrostomy under radiological guidance. In the future, intraluminal myotomy or endoscopic mucosectomy will possibly be an option. Further studies are needed to investigate the role of immunosuppressive therapies in those cases in which an autoimmune etiology is suspected.

Transoral endoscopic esophageal myotomy based on esophageal function testing in a survival porcine model

BACKGROUND

The most effective treatment of achalasia is Heller myotomy.

OBJECTIVE

To explore a submucosal endoscopic myotomy technique tailored on esophageal physiology testing and to compare it with the open technique.

DESIGN

Prospective acute and survival comparative study in pigs (n = 12; 35 kg).

SETTING

University animal research center.

INTERVENTION

Eight acute-4 open and 4 endoscopic-myotomies followed by 4 survival endoscopic procedures.

MAIN OUTCOME MEASUREMENTS

Preoperative and postoperative manometry; esophagogastric junction (EGJ) distensibility before and after selective division of muscular fibers at the EGJ and after the myotomy was prolonged to a standard length by using the EndoFLIP Functional Lumen Imaging Probe (Crospon, Galway, Ireland).

RESULTS

All procedures were successful, with no intraoperative and postoperative complications. In the survival group, the animals recovered promptly from surgery. Postoperative manometry demonstrated a 50% drop in mean lower esophageal sphincter pressure (LESp) in the endoscopic group (mean preoperative LESp, 22.2 ± 3.3 mm Hg; mean postoperative LESp, 11.34 ± 2.7 mm Hg; P < .005) and a 69% loss in the open procedure group (mean preoperative LESp, 24.2 ± 3.2 mm Hg; mean postoperative LESp, 7.4 ± 4 mm Hg; P < .005). The EndoFLIP monitoring did not show any distensibility difference between the 2 techniques, with the main improvement occurring when the clasp circular fibers were taken.

LIMITATIONS

Healthy animal model; small sample.

CONCLUSION

Endoscopic submucosal esophageal myotomy is feasible and safe. The lack of a significant difference in EGJ distensibility between the open and endoscopic procedure is very appealing. Were it to be perfected in a human population, this endoscopic approach could suggest a new strategy in the treatment of selected achalasia patients.

Transcervical heller myotomy using flexible endoscopy

INTRODUCTION

Esophageal achalasia is most commonly treated by laparoscopic myotomy. Transesophageal approaches using flexible endoscopy have recently been described. We hypothesized that using techniques and flexible instruments from our NOTES experience through a small cervical incision would be a safer and less traumatic route for esophageal myotomy. The purpose of this study was to evaluate the feasibility, safety, and success rate of using flexible endoscopes to perform anterior or posterior Heller myotomy via a transcervical approach.

METHODS

This animal (porcine) and human cadaver study was conducted at the Legacy Research and Technology Center. Mediastinal operations on ten live, anesthetized pigs and two human cadavers were performed using standard flexible endoscopes through a small incision at the supra-sternal notch. The esophagus was dissected to the phreno-esophageal junction using balloon dilatation in the peri-esophageal space followed by either anterior or posterior distal esophageal myotomy. Success rate was recorded of esophageal dissection to the diaphragm and proximal stomach, anterior and posterior myotomy, perforation, and complication rates.

RESULTS

Dissection of the esophagus to the diaphragm and performing esophageal myotomy was achieved in 100% of attempts. Posterior Heller myotomy was always extendable onto the gastric wall, while anterior gastric extension of the myotomy was found to be more difficult (4/4 and 2/8, respectively; P = 0.061).

CONCLUSION

Heller myotomy through a small cervical incision using flexible endoscopes is feasible. A complete Heller myotomy was performed with a higher success rate posteriorly possibly due to less anatomic interference.

Botox, dilation, or myotomy? Clinical outcome of interventional and surgical therapies for achalasia

PURPOSE

Achalasia is a rare, but well-defined primary esophageal motor disorder. Classic therapeutic approaches include botulinum toxin injection, balloon dilation, and surgical myotomy of the lower esophageal sphincter. This report summarizes our experience with different treatment modalities for achalasia.

METHODS

Forty-three patients with achalasia treated in our hospital were subdivided according to therapeutic strategy: endoscopic botulinum toxin injection into the lower esophageal sphincter (EBTI; n = 7), endoscopic esophageal balloon dilation (EBD; n = 16), surgical myotomy after failed esophageal balloon dilation (EBD-HM; n = 14), and first-line surgical myotomy (HM; n = 6). Therapeutic efficiency was evaluated comparing standardized symptom scores preoperatively and at follow-up.

RESULTS

There was no mortality and no significant difference between the groups for age, sex, or morbidity. The mean follow-up was at 9, 35, 38, and 17 months. At follow-up, recurrent or persistent symptoms were found in 71.4%, 6.3%, 35.7%, and 16.7% in EBTI, EBD, EBD-HM, and HM, respectively. Considering EBD-HM patients as failures of esophageal dilation, the total rate of recurrent or persistent symptoms after EBD was 50%. Poor symptomatic outcome was correlated to a low esophageal sphincter pressure during pretherapeutic manometry (p = 0.03) and to sigmoid-shaped esophageal dilatation (p = 0.06).

CONCLUSION

Surgical myotomy is the most reliable first-line therapy for achalasia, particularly in patients with a high sphincter pressure and moderate esophageal dilatation. Botox injection has a high failure rate and should be reserved for exceptional cases. Endoscopic dilation provides about 50% of patients with long-term symptomatic relief; in most cases, failure can be successfully treated surgically.

Botox, dilation, or myotomy? Clinical outcome of interventional and surgical therapies for achalasia

PURPOSE

Achalasia is a rare, but well-defined primary esophageal motor disorder. Classic therapeutic approaches include botulinum toxin injection, balloon dilation, and surgical myotomy of the lower esophageal sphincter. This report summarizes our experience with different treatment modalities for achalasia.

METHODS

Forty-three patients with achalasia treated in our hospital were subdivided according to therapeutic strategy: endoscopic botulinum toxin injection into the lower esophageal sphincter (EBTI; n = 7), endoscopic esophageal balloon dilation (EBD; n = 16), surgical myotomy after failed esophageal balloon dilation (EBD-HM; n = 14), and first-line surgical myotomy (HM; n = 6). Therapeutic efficiency was evaluated comparing standardized symptom scores preoperatively and at follow-up.

RESULTS

There was no mortality and no significant difference between the groups for age, sex, or morbidity. The mean follow-up was at 9, 35, 38, and 17 months. At follow-up, recurrent or persistent symptoms were found in 71.4%, 6.3%, 35.7%, and 16.7% in EBTI, EBD, EBD-HM, and HM, respectively. Considering EBD-HM patients as failures of esophageal dilation, the total rate of recurrent or persistent symptoms after EBD was 50%. Poor symptomatic outcome was correlated to a low esophageal sphincter pressure during pretherapeutic manometry (p = 0.03) and to sigmoid-shaped esophageal dilatation (p = 0.06).

CONCLUSION

Surgical myotomy is the most reliable first-line therapy for achalasia, particularly in patients with a high sphincter pressure and moderate esophageal dilatation. Botox injection has a high failure rate and should be reserved for exceptional cases. Endoscopic dilation provides about 50% of patients with long-term symptomatic relief; in most cases, failure can be successfully treated surgically.

Botox, dilation, or myotomy? Clinical outcome of interventional and surgical therapies for achalasia

PURPOSE

Achalasia is a rare, but well-defined primary esophageal motor disorder. Classic therapeutic approaches include botulinum toxin injection, balloon dilation, and surgical myotomy of the lower esophageal sphincter. This report summarizes our experience with different treatment modalities for achalasia.

METHODS

Forty-three patients with achalasia treated in our hospital were subdivided according to therapeutic strategy: endoscopic botulinum toxin injection into the lower esophageal sphincter (EBTI; n = 7), endoscopic esophageal balloon dilation (EBD; n = 16), surgical myotomy after failed esophageal balloon dilation (EBD-HM; n = 14), and first-line surgical myotomy (HM; n = 6). Therapeutic efficiency was evaluated comparing standardized symptom scores preoperatively and at follow-up.

RESULTS

There was no mortality and no significant difference between the groups for age, sex, or morbidity. The mean follow-up was at 9, 35, 38, and 17 months. At follow-up, recurrent or persistent symptoms were found in 71.4%, 6.3%, 35.7%, and 16.7% in EBTI, EBD, EBD-HM, and HM, respectively. Considering EBD-HM patients as failures of esophageal dilation, the total rate of recurrent or persistent symptoms after EBD was 50%. Poor symptomatic outcome was correlated to a low esophageal sphincter pressure during pretherapeutic manometry (p = 0.03) and to sigmoid-shaped esophageal dilatation (p = 0.06).

CONCLUSION

Surgical myotomy is the most reliable first-line therapy for achalasia, particularly in patients with a high sphincter pressure and moderate esophageal dilatation. Botox injection has a high failure rate and should be reserved for exceptional cases. Endoscopic dilation provides about 50% of patients with long-term symptomatic relief; in most cases, failure can be successfully treated surgically.