Peroral Endoscopic Myotomy Procedure Research Articles

Achalasia Following SARS-CoV-2 Infection: A Case Report and Review of Literature.

The COVID-19 pandemic caused by the SARS-CoV-2 virus has led to health complications beyond respiratory symptoms, revealing multi-organ involvement, including potential gastrointestinal implications. We present a case of a 40-year-old female without any history of achalasia who developed symptoms of the condition following a confirmed SARS-CoV-2 infection. Unusually, multiple esophageal ulcers were identified, which are not typically associated with achalasia. Achalasia and esophageal ulcers were confirmed through a series of examinations, including barium swallow, CT scan, and upper endoscopy. Furthermore, immunohistochemical staining of esophageal biopsy specimens revealed the presence of the SARS-CoV-2 spike protein, suggesting direct viral involvement. The patient was treated with calcium channel blockers and proton pump inhibitors and later underwent a peroral endoscopic myotomy (POEM) procedure following the resolution of her COVID-19 infection. After the POEM procedure, the patient made a good recovery. This case underscores the potential for SARS-CoV-2 to trigger gastrointestinal complications and emphasizes the need for ongoing patient management and further research into the long-term implications of COVID-19. Despite the single-case nature of this report, it contributes to the expanding understanding of the diverse and multi-systemic impact of COVID-19.

A203 PERORAL ENDOSCOPIC MYOTOMY (POEM) FOR COMPLEX ACHALASIA AND THE POEM DIFFICULTY SCORE: AN UPDATE

Abstract Background POEM for achalasia can be challenging in patients with complex achalasia (CA) (i.e., type III achalasia, multiple prior treatments, prior myotomy, and sigmoid type). The POEM difficulty score (PDS) identifies factors that contribute to challenging POEM procedures. (Figure 1) Here, we present an update on the PDS in a series of patients with non-CA and CAs. Aims Our aim was to determine whether, with the introduction of the TT-J knife with waterjet functionality, the PDS still maintains a strong correlation with procedural efficiency and technical difficulty. Methods We retrospectively reviewed patients who underwent POEM for achalasia between May 2018 to July 2023 at the Kingston Health Sciences Center. 139 consecutive POEMs were performed, with 74 CAs. Primary outcomes include correlation of procedural efficiency with the PDS. Secondary outcomes include clinical success at the last followup and adverse events. Demographics and procedural variables were compared with descriptive statistics (mean ± SD; median, min-max range) and the Mann-Whitney U-test. Pre and post-POEM Echkhardt scores were compared using the Wilcoxon signed-rank test. Results 74 (56.7% male) complex and 65 (55.4% male) non-complex POEM procedures were carried out. The mean age is 56.7 ± 16.5 years and 47.3 ± 20.2 years in CA and non-CA respectively. PDS correlates moderately with procedural efficiency with a correlation coefficient of 0.595 (Spearman’s Pampersand:003C0.001). A subanalysis is available in Table 1. The mean efficiency for non-CA was 3.3min/cm±1.2. The median PDS for non-CA was 1 (0-5). In comparison, the mean efficiency for CA were 3.3min/cm ± 1.3 (type III), 5.3min/cm ± 2.3 (prior myotomy), 4.0min/cm ± 1.7 (≥4 prior procedures), and 5.2min/cm ± 2.4 (sigmoid type). The median PDS for CA was 3 (0-6) (type III), 4 (0-8) (prior myotomy), 3 (0-8) (≥4 prior procedures), and 3 (0-6) (sigmoid type). CA and non-CA POEM procedures were completed with 97% and 98% clinical success, respectively. Conclusions PDS continues to moderately correlate with procedural efficiency using the TT-J knife. However, the presence of spastic contractions correlated poorly with procedural efficiency. Thus, it may be omitted with the use of the TT-J knife. The order of increasing difficulty of POEM in CA appears to be type III, prior myotomy, sigmoid type, and ≥4 prior procedures. Multi-center prospective studies are needed to validate PDS in different clinical settings. Table 1: Sub-analysis of individual PDS factors and procedural velocity Figure 1: Peroral Endoscopic Myotomy (POEM) difficulty score (PDS): "FOODS" Funding Agencies None

A207 SLING-FIBER PRESERVATION DURING POEM IS AN INDEPENDENT FACTOR IN REDUCING POST-POEM GERD SYMPTOMS: A CANADIAN SINGLE-CENTER RETROSPECTIVE STUDY

Abstract Background Gastroesophageal reflux disease (GERD) after peroral endoscopic myotomy (POEM) has been a limiting factor with POEM procedure. Preservation of the sling-fiber during POEM was reported to reduce post-POEM GERD in Japan, but there are no reports of this technique in a western population. Aims The aim is to investigate the association of sling-fiber preservation during POEM and post-POEM GERD symptoms at our institution, which is a large therapeutic endoscopy referral center in Canada. Methods This is a retrospective, single-center study of patients who underwent POEM from October 2017 to January 2023 at our center. The initial cohort of patients were treated by conventional POEM until June 2021, after which a second cohort underwent POEM with sling-fiber preservation, as the techniques advanced. The primary outcome was the rate of positive GERD symptoms after POEM. The secondary outcomes were clinical success rate, adverse events rate, use of PPI at follow-up. Multivariate regression was performed to identify factors that reduce post-POEM GERD symptoms. Results 148 POEM cases (52.5±15.6y/o, female:61(43%)) were included in this study. There was no significant difference in patient characteristics between the groups. The mean procedure time (108.6±34.5 vs 109.1±45.7 min, P=0.93) and rate of adverse events (20% vs 18%, P=0.85) were similar between the traditional and modified groups. In the sling fiber preservation group, gastric myotomy length was significantly longer (2.2±0.7 vs 1.6±0.8 cm, Pampersand:003C0.05) yet the GERD symptom rate at follow-up was significantly lower (22% vs 42%, Pampersand:003C0.05), although PPI use was similar (52% vs 48%, P=0.73). The clinical success rate was similar between groups (88% vs 84%, P=0.6). Regression analysis indicated that, after adjusting for other risk factors of post-POEM GERD, sling-fiber preservation during POEM had an odds ratio of 0.24 (95%CI:0.07-0.85, Pampersand:003C0.05) for post-POEM GERD symptoms. Conclusions Sling-fiber preservation during POEM effectively reduces post-POEM GERD symptoms, despite a longer gastric myotomy length. It stands as a independent factor in reducing post-POEM GERD symptoms. Hence, sling-fiber preservation may be a beneficial solution for reducing post-POEM GERD symptoms in Western populations. Outcomes of conventional POEM and sling-fiber preservation POEM POEM; Peroral endoscopic myotomy, SD; standard deviation, GERD; gastroesophageal reflux disease, PPI; proton pump inhibitor Funding Agencies None

Utility of Intraprocedural Luminal Diameter and Distensibility Measurements During the Esophageal Peroral Endoscopic Myotomy Procedure.

Through evaluation of the lower esophageal sphincter immediately before and after myotomy using an endoluminal functional lumen imaging probe (EFLIP), our study aimed to determine the clinical response to peroral endoscopic myotomy (POEM) and the incidence of postprocedure reflux. Achalasia is a rare esophageal motility disorder characterized by impaired relaxation of the lower esophageal sphincter (LES) and diminished peristalsis. POEM is a therapeutic option for durable management of achalasia. However, symptomatic acid reflux and esophagitis are well-known adverse effects of the procedure. Electronic medical records of 168 patients who underwent POEM for achalasia at 2 tertiary care referral centers from May 2014 to May 2021 were reviewed. EFLIP was used at a range of catheter fill volumes to assess LES dynamics. Preprocedure and postprocedure Eckardt Symptom Scores were recorded. Significant clinical improvement from POEM was sustained in over 94% of patients after 1 year. EFLIP changed intraprocedural management 5% of the time by means of myotomy extension. In patients with reflux>1 year following POEM, there was no significant difference in post-POEM LES diameter or change in LES diameter compared with those without reflux. However, post-POEM LES distensibility index (DI) was significantly higher in patients with reflux after 1 year compared with those without reflux. POEM is a safe and increasingly effective therapy for patients with symptomatic achalasia. Intraprocedural EFLIP measurements suggest that post-POEM reflux may be correlated more with DI than LES diameter. Yet, more data is needed to substantiate these outcomes.

Anesthesia choice and its potential impact on endoluminal functional lumen imaging probe measurements in esophageal motility disorders

The widespread use of peroral endoscopic myotomy (POEM) has revolutionized the management of esophageal motility disorders (EMDs). The introduction of an endoluminal functional lumen imaging probe (EndoFLIP, Medtronic, Dublin, Ireland) can serve as a complementary diagnostic tool to assess the mechanical properties (ie, pressure, diameter, distensibility, topography) of the esophagus. During EndoFLIP measurements, different anesthesia techniques may induce variable degrees of neuromuscular blockade, potentially affecting esophageal motility and altering the results of EndoFLIP metrics. The aim of this study was to compare the impact of using total intravenous anesthesia (TIVA) versus general anesthesia with inhalational anesthetics (GAIA) on diagnostic EndoFLIP measurements. This retrospective study included all adult patients (≥18 years) undergoing EndoFlip during the POEM procedure at our institution between February 2017 and February 2022. Differences in pressure, diameter, and distensibility index were obtained by using propofol-based TIVA versus sevoflurane-based GAIA with a 30 mL and a 60 mL balloon. The differences were divided into terciles and compared between diagnoses by using univariate comparisons and logistic regression models. A total of 49 patients were included (39% type I achalasia, 43% type II or III achalasia, and 18% jackhammer esophagus [JE]). Compared with spastic disorders (types II and III achalasia and JE), type I had lower values of pressure differences at 60 mL in univariate (3.75 vs 15.20, P= .001) and multivariate (adjusted odds ratio, .89; 95% confidence interval, .82-.978) analyses. Compared with type I, types II and III achalasia had higher rates of pressure differences at 60 mL in the univariate (9.85 vs 3.75, P= .04) analysis and nearly reached significance in the multivariate analysis (1.09; 95% confidence interval, 1-1.20). Compared with type I achalasia, JE exhibited higher values in pressure differences at 60 mL (27.7 vs 3.75, P< .001). Esophageal pressure, as measured by EndoFLIP, was significantly reduced when patients were sedated with sevoflurane-based GAIA. The use of sevoflurane-based GAIA for diagnostic EndoFLIP may potentially lead to the misclassification of spastic disorders as type I achalasia. Propofol-based TIVA should therefore be considered over sevoflurane-based GAIA for sedation during the diagnostic test.

Direct cost variance analysis of peroral endoscopic myotomy vs heller myotomy for management of achalasia: A tertiary referral center experience.

Laparoscopic Heller myotomy (LHM) has been the traditional surgical treatment for achalasia. Recently, peroral endoscopic myotomy (POEM) has demonstrated similar clinical outcomes with shorter procedure times. Studies comparing the direct cost-effectiveness of POEM vs LHM are limited. To compare costs of POEM vs LHM. This retrospective chart review aimed to compare the outcomes and cost of clinical care between patients who underwent POEM and LHM procedures for achalasia. The study was conducted at a tertiary academic center from January 2019 to December 2020. Clinical outcomes, including post-operative Eckardt scores and adverse events, were assessed and compared between the two groups. Direct cost variance analysis was utilized to evaluate the cost of clinical care incurred by patients undergoing POEM in the year preceding the procedure, during the index admission, and one year post-procedure, in comparison to patients undergoing LHM. Of 30 patients were included (15 POEM and 15 LHM) in the study. Patients in the POEM group had a mean Eckardt score of 0.5 ± 0.5 post-procedure, which was no different from patients in the LHM group (0.7 ± 0.6, P = 0.17) indicating comparative efficacy. However, the total costs of the admission for the procedure in the LHM group were on average $1827 more expensive than in the POEM group (P < 0.01). Total healthcare costs one year prior to index procedure were $7777 higher in the LHM group, but not statistically different (P = 0.34). The patients in the LHM group one year after the index procedure had accrued $19730.24 larger total cost, although this was not statistically different from POEM group (P = 0.68). Despite similar clinical outcomes, the cost of the index procedure admission for POEM was significantly lower than for LHM. The difference was primarily related to shorter time increments utilized in the operating room during the index procedure, and shorter length of hospital stay following POEM.

Defining “true acid reflux” after peroral endoscopic myotomy for achalasia: a prospective cohort study

Background & AimsThe symptoms of reflux in achalasia patients undergoing per-oral endoscopic myotomy (POEM) are believed to result from gastroesophageal reflux, and the current treatment primarily focuses on acid suppression. Nevertheless, other factors such as non-reflux acidification caused by fermentation or stasis might play a role. This study aims to identify patients with “true acid reflux” who actually require acid suppression and fundoplication. MethodsIn this prospective large cohort study, the primary objective was to assess the incidence and risk factors for “true acid reflux” in achalasia patients undergoing POEM. Acid reflux with normal and delayed clearance defined the “true acid reflux”, while other patterns were labelled as “non-reflux acidification patterns” on manual analysis of pH tracings. These findings were corroborated with symptom questionnaire, esophagogastroscopy, esophageal manometry, timed barium esophagogram at 3 months after the POEM procedure. Results54 achalasia patients, aged 18-80 years [mean age 41.1 years (12.8), 59.3% males, 90.7% type II achalasia] underwent POEM resulting in significant mean Eckardt score improvement (6.7 to 1.6;p<0.05). “True acid reflux” was noted in 29.6% as compared to 64.8% on automated analysis. Acid fermentation was the predominant acidification pattern seen in 42.7% patients. On multivariable logistic regression analysis, increasing age (OR,1.12;95%CI,1.02-1.27;p=0.04) and pre-procedural integrated relaxation pressure (IRP) (OR,1.13;95%CI,1.04–1.30;p=0.02) were significantly associated with “true acid reflux” in post-POEM patients. ConclusionA manual review of pH tracings helps identifying “true acid reflux” in post-POEM achalasia patients. Pre-procedural IRP can be a predictive factor in determining patients at risk for this outcome.

Effect of peroral endoscopic myotomy on growth and esophageal motility for pediatric esophageal achalasia

Peroral endoscopic myotomy (POEM), a novel minimally invasive treatment for esophageal achalasia, has been shown to be effective and safe for both adult and pediatric patients. However, studies on its application in children in Taiwan and its impact on growth and esophageal motility are lacking. We conducted a retrospective study on consecutive pediatric patients who were diagnosed with esophageal achalasia at National Taiwan University Hospital and underwent POEM during 2015-2022. Disease characteristics and treatment outcomes were analyzed. Ten patients (age 16.9±3.1 years), nine newly diagnosed and one previously treated with pneumatic dilatation, underwent POEM for achalasia (type I/II/III: 3/7/0). Average symptom duration before diagnosis was 19.4±19.9 months, mean POEM procedure time was 83.6±30.7min, and clinical success (Eckardt score ≤3) was achieved in all patients. Eight patients experienced mild adverse events during POEM, but none required further endoscopic or surgical intervention. Over a mean follow-up period of 3.7±1.6 years, mean Eckardt score decreased significantly from 5.7±2.4 to 1.1±0.7 (p=0.0001). The BMI z-score also increased significantly after POEM (p=0.023). Five patients received follow-up high-resolution impedance manometry (HRIM), and all had improved lower esophageal sphincter resting pressures (p=0.011), body contractility, and bolus transit (p=0.019). POEM is an effective and safe treatment for pediatric achalasia in Taiwan. Early diagnosis and treatment with POEM may help to restore esophageal function and nutrition status in children.

Settings of a novel electrosurgical generator to enable efficient and safe submucosal endoscopic procedures

Abstract Background and study aims A novel electrosurgical generator unit (ESU), ConMed Beamer, was recently introduced to facilitate endoscopic submucosal dissection (ESD) by employing Automatic Cutting Effect (ACE) technology. Its use in submucosal endoscopy has yet to be investigated. The aim of this study was to evaluate the feasibility and safety of performing ESD and peroral endoscopic myotomy (POEM) using novel settings generated with ConMed Beamer ESU. Patients and methods This was a single-center prospective study of 59 consecutive patients undergoing ESD/POEM at a tertiary referral center. ESU settings were initially generated by testing in live animal models prior to first in-human study. The primary outcome was technical success. Secondary outcomes were procedure times, rate of en bloc/R0 resection, and rate of adverse events (AEs). Results A total of 44 patients (50 polyps) and 15 patients underwent ESD and POEM, respectively. En bloc resection, R0 resection, and curative resection rates were 90%, 77.1%, and 70.8%, respectively. Mean maximal length of the lesion was 3.07 cm ± 1.43 with an average dissection speed of 14.2 cm2/hr ± 11.1. Technical success was achieved in 100% of POEM patients. Mean time (minutes) to complete the POEM procedure was 50.1 min ± 12.4. Two major AEs occurred among all patients (3.4%). All intraprocedural bleeding events were controlled using the ConMed Beamer ESU. Conclusions ConMed Beamer ESU settings generated from this study were proven safe and effective in a prospective cohort of patients who underwent submucosal endoscopic procedures. This novel ESU can be added to the armamentarium of ESD capable generators.

Comparing clinical success and procedural difficulty between treatment-naïve and treatment-refractory patients with esophageal motility disorders during peroral endoscopic myotomy.

Peroral endoscopic myotomy (POEM) can successfully treat patients with achalasia. Prior therapy with Botox (Allergan, Madison, NJ, USA) injections, pneumatic dilation (PD), and/or laparoscopic Heller myotomy (LHM) is believed to increase the difficulty of POEM procedures. We aimed to determine if prior treatment methods were associated with longer procedure times or lower clinical success. In this single-center retrospective study, consecutive patients who underwent POEM for achalasia between February 2017 and September 2021 were studied. Collected data were patient demographics, prior treatment, pre- and postprocedure Eckardt score (ES), distensibility indices (DIs), and procedure times. Primary outcomes were clinical success and procedure difficulty. Of 95 patients (mean age, 55.6 years; 45% women), 25 patients underwent POEM for type I achalasia, 31 for type II achalasia, and 33 for spastic esophageal pathologies. Thirty-three patients (34.7%) were treated for achalasia before POEM with onabotulinumtoxinA injections (n= 18), PD (n= 17), and LHM (n= 3). There were no significant differences in post-treatment ESs or technical success between the 2 groups (P= .98 and P= .66, respectively). Multivariate analysis showed that prior treatment was associated with decreased case time and easier tunneling during POEM. Prior treatment did not impact the clinical success rate of POEM and led to decreased case times and easier tunneling difficulty, likely because of persistent lower esophageal sphincter changes and differences in diagnostic indications. POEM should be considered for patients with treatment-refractory symptoms as a safe and feasible option. Further large-scale studies are needed to validate our findings.

Bariatric endoscopic antral myotomy: first-in-human proof of concept of a novel therapeutic method to delay gastric emptying and induce weight loss

Bariatric endoscopic antral myotomy: first-in-human proof of concept of a novel therapeutic method to delay gastric emptying and induce weight loss

Peroral Endoscopic Myotomy: What Nurses Need to Know to Provide Preeminent Perioperative Care.

This article aims to explore details of research, evidence, and key concepts intended for nurses and other healthcare clinicians surrounding the paradigm shift in therapeutic endoscopy relating to the third-space endoscopic procedure, peroral endoscopic myotomy. Although many medical publications detail the procedure, there are no specific guidelines for nurses to reference when caring for the patient undergoing peroral endoscopic myotomy. With scant published resources available to direct nurses distinctly in the delivery of exceptional care to patients undergoing peroral endoscopic myotomy, there is an identified need for collated information to be accessible to all nurses providing perioperative teaching and care. As peroral endoscopic myotomy continues to transpire as a mainstream or preferred standard treatment for patients who suffer from achalasia, relevant education remains to be fully understood and assessed in the nursing arena. By examining nursing considerations for patient care, indications, techniques, and advancements regarding this ever-emergent breakthrough, readers will discover guidance in comprehensive care encompassing patients undergoing the peroral endoscopic myotomy procedure.

Anaesthetic management and associated complications of per-oral endoscopic myotomy (POEM) procedure in a patient with achalasia cardia type II: A case report

Achalasia, a benign motility disorder of the esophagus, results in incomplete relaxation of the lower esophageal sphincter (LES) and absent peristalsis. Patients experience dysphagia, regurgitation, chest pain, weight loss, and heartburn. Pharmacological therapy has been unsatisfactory and definitive treatment has focused on mechanical disruption of the tight LES. Peroral endoscopic myotomy (POEM) is a safe and minimally invasive modality regarded as the first line management of all types of achalasia. POEM is performed under general anesthesia with endotracheal intubation using an orally inserted gastrointestinal endoscope. Briefly, POEM involves endoscopic creation of a mid-esophageal submucosal incision, creation of a submucosal tunnel with the endoscope, and then a myotomy of distal circular muscles with a Triangular Tip electrosurgical (TT) knife, resulting in relaxation of the achalasia. We, hereby report a case of a patient with Achalasia Cardia Type II posted for POEM procedure under General Anaesthesia.

Use of the Scissor-Type Knife During the Peroral Endoscopy Myotomy Procedure for the Treatment of Achalasia

Peroral endoscopic myotomy (POEM) is one of the first-line treatment modalities along with pneumatic dilation and Heller myotomy for patients with achalasia. Endoscopists, especially trainees during the learning phase, commonly face difficulty in tissue plane dissection and selective myotomy while working near the esophagogastric junction, with increased risks of inadvertent injury, unexpected bleeding, and inadequate myotomy. To minimize the technical difficulty and improve the safety of POEM, we describe a protocol for using a scissor-type knife for the main steps of POEM, including mucosal incision, submucosal tunneling, myotomy, and hemostasis. The standard techniques used with the scissor-type knife involve grasping the target tissue, and then dissection or coagulation. The confirmation of the cutting line after grasping improves the accuracy and reliability of dissection, which is particularly useful for the selective myotomy of the internal circular muscle. Meanwhile, the scissor-type knife provides enhanced hemostatic capability and enables hemostasis and pre-coagulation without the device exchange for hemostatic forceps. Evaluation of the clinical outcomes in three patients who successfully received POEM using the scissor-type knife revealed no perioperative adverse events. At the 3-month follow-up, all patients achieved clinical success with postoperative Eckardt scores ranging from 0 to 1. In conclusion, the use of a scissor-type knife could minimize the technical difficulty and improve the safety of the POEM procedures, which may be suitable for trainees during the learning phase.

Use of the Scissor-Type Knife During the Peroral Endoscopy Myotomy Procedure for the Treatment of Achalasia

Peroral endoscopic myotomy (POEM) is one of the first-line treatment modalities along with pneumatic dilation and Heller myotomy for patients with achalasia. Endoscopists, especially trainees during the learning phase, commonly face difficulty in tissue plane dissection and selective myotomy while working near the esophagogastric junction, with increased risks of inadvertent injury, unexpected bleeding, and inadequate myotomy. To minimize the technical difficulty and improve the safety of POEM, we describe a protocol for using a scissor-type knife for the main steps of POEM, including mucosal incision, submucosal tunneling, myotomy, and hemostasis. The standard techniques used with the scissor-type knife involve grasping the target tissue, and then dissection or coagulation. The confirmation of the cutting line after grasping improves the accuracy and reliability of dissection, which is particularly useful for the selective myotomy of the internal circular muscle. Meanwhile, the scissor-type knife provides enhanced hemostatic capability and enables hemostasis and pre-coagulation without the device exchange for hemostatic forceps. Evaluation of the clinical outcomes in three patients who successfully received POEM using the scissor-type knife revealed no perioperative adverse events. At the 3-month follow-up, all patients achieved clinical success with postoperative Eckardt scores ranging from 0 to 1. In conclusion, the use of a scissor-type knife could minimize the technical difficulty and improve the safety of the POEM procedures, which may be suitable for trainees during the learning phase.

Peroral endoscopic myotomy: is it better to perform it in naive patients or as second-line therapy? Results of an open-label-controlled study in 105 patients

BackgroundWhether Peroral Endoscopic Myotomy (POEM) can be proposed as a second-line treatment in patients with achalasia remains to be confirmed in real-life series.ObjectiveThis study aimed to compare the efficacy, feasibility and safety of POEM between treatment-naïve patients and patients who had prior endoscopic or surgical therapies for achalasia.MethodsAll consecutive patients who underwent a POEM procedure for achalasia in our centre from June 2015 to September 2018 were included in this retrospective study. They were classified into treatment-naïve patients (POEM1) and patients who had at least one previous endoscopic and/or surgical treatment for achalasia (POEM2).ResultsA total of 105 patients were included, 52 in the POEM1 group and 53 in the POEM2 group. Clinical success (defined as an Eckardt score ≤ 3) at 6 months was observed in 93% of POEM1 patients and 84% of POEM2 patients (p = 0.18). Technical success rate was not significantly different between the two groups (100% vs 96%, respectively; p = 0.50). No significant difference was noted in terms of adverse event rate (19% vs 19%, respectively; p = 1.00). Post-procedure pain occurred in 12% of treatment-naive and 9% of non-naïve patients (p = 0.76). The median length of hospital stay was 3 days in both groups (p = 0.17). Symptomatic gastroesophageal reflux occurred in 25% of POEM1 patients and 16% of POEM2 patients (p = 0.24).ConclusionEfficacy, feasibility and safety of POEM are not different between treatment-naïve and non-naïve patients. POEM is a valuable second-line approach in patients with persistent symptoms of achalasia after surgical or endoscopic treatments.

The utility of Endoscopic Functional Luminal Imaging (EndoFLIP) in the diagnosis and management of children with achalasia

Per-oral endoscopic myotomy (POEM) has is an alternative treatment to laparoscopic Heller myotomy for children with achalasia. The EndoFLIP functional luminal imaging system is used to measure esophagogastric junction (EGJ) distensibility pre- and post-POEM. Previous adult studies have established a correlation between obstructive symptoms and Distensibility Index (DI). Here we analyze the utility of EndoFLIP in diagnosis and management of achalasia in the largest study on pediatric POEM patients and hypothesize that DI may aid diagnosis and treatment of pediatric achalasia. Demographics, preoperative basal and residual pressures measured on manometry, and EndoFLIP measurements pre- and post-POEM were recorded for children that underwent POEM. Pearson correlation coefficient and T-scores were used to assess for correlation between manometry measurements and pre-POEM DI. Linear regression was conducted to analyze the relationship between pre-POEM DI, Eckardt scores, and manometry pressures. Of 33 patients that underwent POEM and EndoFLIP since 2014 (21 male, 12 female), the median pre-POEM Eckardt score decreased from 7 to 1 post-POEM. The median basal pressure was 50±25mmHg, pre-POEM DI was 0.9 (0.8-1.6) mm2/mmHg and the post-POEM DI was 3.8 (3.2-4.4) mm2/mmHg. There was no correlation between DI and basal pressure or residual pressure, though there was a strong negative correlation between Eckardt scores and DI. The EndoFLIP system is a valuable tool in adult patients in diagnosing achalasia and defining the endpoint of the POEM procedure. We find that there is a role for EndoFLIP in the pediatric population in diagnosis and management of the disease. Study of diagnostic test; Level IV.

Impact of peroral endoscopic myotomy on high-resolution manometry findings and their association with the procedure’s outcomes

Peroral endoscopic myotomy (POEM) is conducted for patients with esophageal motility disorders based on high-resolution manometry (HRM) findings. However, the impact of POEM on HRM findings and the associations between post-POEM HRM and outcomes have not been clarified. In a multicenter, observational, cohort study, patients with achalasia treated by POEM received follow-up HRM. Associations between patient characteristics, POEM procedures, and post-POEM HRM findings, including integrated relaxation pressure (IRP) and distal contractile integral (DCI), were investigated. Furthermore, POEM procedure outcomes were compared with post-POEM HRM findings. Of 2171 patients, 151 (7.0%) showed residual high post-POEM IRP (≥26mm Hg; Starlet [Starmedical Ltd, Tokyo, Japan]). In a multivariate analysis, high pre-POEM IRPs (odds ratio [OR], 24.3) and gastric myotomy >2 cm (OR, .22) were found to be positive and negative predictive factors of high post-POEM IRPs, respectively. Peristalsis recovery (DCI≥500mm Hg/cm/s, at least 1 swallow; Starlet) was visible in 121 of 618 patients (19.6%) who had type II to III achalasia. High pre-POEM IRP (OR, 2.65) and DCI≥500 (OR, 2.98) predicted peristalsis recovery, whereas esophageal dilation (OR, .42) predicted a risk of no recovery. Extended myotomy did not reveal a significant impact on peristalsis recovery. High or low post-POEM IRP and DCI did not increase the incidence of clinical failure, reflux esophagitis, or symptomatic GERD. Extended gastric myotomy decreased IRP values, whereas peristalsis recovery depended on the characteristics of achalasia. A residual high post-POEM IRP does not necessarily mean clinical failure. Routine HRM follow-up is not recommended after POEM.

S381 Retrieving an Endoscopic Cap From the Submucosal Tunnel During a POEM Procedure: Keep an Eye on the Cap Before Closing the Mucosal Incision

Introduction: Achalasia is an esophageal motility disorder that results in the failure of the lower esophageal sphincter (LES) to relax. Moderate to severe forms of the Achalasia can be debilitating due to the patients’ inability to tolerate PO food or drink; often experiencing constant pain or pressure. Peroral endoscopic myotomy (POEM) is a relatively novel endoscopic procedure that has shown more favorable results when compared with other therapeutic modalities in the treatment of achalasia. This case illustrates retrieving an endoscopic cap from a closed submucosal tunnel during a POEM procedure. Case Description/Methods: A 74-year-old woman with type 3 achalasia underwent a seemingly routine POEM. At the beginning of the procedure, the GE junction was located, and methylene blue was injected to lift the mucosa at the site of the initial mucosectomy. After the mucosectomy was made, the endoscope was used to enter the submucosal tunnel, which was further lengthened by continued lifting and dissection. The submucosal tunnel was then extended to about 1 to 2 cm distal to the gastroesophageal junction (GEJ), and the myotomy was performed that extended into the cardia with no observed complications. After the mucosectomy site was closed with 4 endoclips, it appeared that the cap of the endoscope was missing after the endoscope’s removal from the esophagus. Upon further inspection of the patient's month, bed and floor in the procedure room, the cap was still missing. The endoscope was then reinserted into the patient’s esophagus to continue the search for the lost cap. The intraluminal compartment of the stomach, the esophagus, and the patient’s oropharynx showed no evidence of the cap. Video of the endoscopic procedure was reviewed, and it revealed the presence of bulging mucosa in the distal esophagus along with the absence of the endoscope cap during the clipping of the mucosectomy site. It was determined that the cap was most likely in the submucosal tunnel. After the initial four clips were removed by rat tooth forceps and deposited into the stomach, the scope went into the submucosal tunnel again. The cap was visualized in the submucosal tunnel and removed with the same rat tooth forceps, which was followed by reclosing the mucosectomy site with four more clips. The patient had a successful postoperative course. Discussion: Review of this case prompts further discussion and research into a more stable cap design for the endoscope, especially for third space endoscopy. Watch the video at https://tinyurl.com/ACGAbstractS381

Impact of modified techniques on outcomes of peroral endoscopic myotomy: A narrative review.

Peroral endoscopic myotomy (POEM) is an established frontline treatment modality for achalasia cardia. Since its initial description, several modifications have been proposed to the technique of POEM. Broadly speaking, these modifications follow the basic principles of submucosal endoscopy, but incorporate variations in the POEM technique, including the difference in the orientation of myotomy (anterior or posterior), length of myotomy (short or long), and thickness of myotomy (selective circular or full thickness). Some of these modifications have been shown to reduce procedural duration without compromising the efficacy of the POEM procedure. More recently, several alterations have been reported that intend to reduce gastroesophageal reflux after POEM. These include preservation of sling fibers during posterior POEM and addition of NOTES fundoplication to the POEM procedure. Although some of the modified techniques have been compared with the conventional techniques in quality trials, randomized studies are awaited for others. The incorporation of some of these modifications will likely make POEM a technically easy and safer modality in near future. This review aims to discuss the current evidence with regard to the impact of modified techniques on the outcome of POEM.