Peroral Endoscopic Myotomy Research Articles

Mini-review: Tailored per-oral endoscopic myotomy for type III achalasia.

This mini-review summarizes the most recent literature regarding per-oral endoscopic myotomy for type III achalasia, emphasizing the poorly understood science of tailoring myotomy length during this procedure. In addition, special attention will be placed on the current subjective and objective biomarkers, such as the Eckardt score, used to evaluate treatment outcomes in this population to better contextualize the existing data on patient outcomes, as proposed by Low etal in the current issue of the Journal. Understanding the current treatment landscape for type III achalasia and identifying the key areas of research deficiencies will guide future investigation and management of this disease.

Intraoperative distensibility measurement in POEM for achalasia: impact on patient outcome and associations with other outcome variables at 1-year follow-up

Background and aimsThe functional luminal imaging probe (FLIP) can provide measurements of lower esophageal sphincter (LES) distensibility. Studies report that use of intraoperative FLIP examination during peroral endoscopic myotomy (POEM) for achalasia is associated with treatment success, but evidence is limited and inconsistent. The main aim of the present study was to assess associations between intraoperative FLIP values and 1-year outcomes. Additionally, associations between 1-year FLIP measurements and other 1-year outcome variables were studied.MethodsWe performed a single-center prospective study of consecutive achalasia patients treated with POEM with a standardized 1-year follow-up. The inclusion period was from June 2017 to January 2020. We compared 1-year outcomes (FLIP measurement values, Eckardt score (ES), reflux esophagitis, timed barium esophagogram (TBE), and lower esophageal sphincter resting pressure (LES-rp)) in patients with and without intraoperative FLIP examination. We also assessed associations between intraoperative FLIP values, 1-year FLIP values, and other 1-year outcomes. Results are given as median (IQR), and non-parametrical statistical analyses were applied.ResultsSixty-two patients (27 females) with median age 45 years (35–54) were included. Baseline characteristics were similar in patients with (n = 32) and without (n = 30) intraoperative FLIP examination. In patients with intraoperative FLIP, ES was 2 (1–3) and LES distensibility index (DI) 3.7 (2.6–5.4) after 1 year, compared with ES 2 (1–3) and DI 4.0 (3.1–6.8)) in patients without intraoperative FLIP (ns). Intraoperative DI was not correlated with 1-year ES or DI. One-year DI correlated significantly with 1-year ES (rs − 0.42), TBE (rs − 0.34), and LES-rp (rs − 0.29).ConclusionsUse of intraoperative FLIP measurements in POEM for achalasia is not associated with improved 1-year outcome, and the clinical value of intraoperative FLIP in POEM for achalasia is questioned. Follow-up FLIP measurements are moderately associated with symptomatic outcome, and may serve as an additional diagnostic modality in post-treatment evaluation.Graphical abstract

Through-the-scope suturing for closure of contained leak after cricopharyngeal peroral endoscopic myotomy

Video 1.

Active narcotic use and post–peroral endoscopic myotomy outcomes in esophageal motility disorders

Background and AimsPeroral Endoscopic Myotomy (POEM) is a minimally invasive technique used to treat esophageal motility disorders. Opioid use has been demonstrated to adversely affect esophageal dysmotility and is associated with an increased prevalence of esophageal motility disorders. Our aim was to investigate the effect of narcotic use on success rates in patients undergoing POEM. MethodsThis was a single center retrospective study of patients undergoing POEM between February 2017 and September 2021. Primary outcomes were post-POEM Eckardt Score (ES), Distensibility Index (DI), and length of procedure. Secondary outcomes included technical success, myotomy length, length of stay, adverse events, reintervention rates, post-procedure GERD. ResultsDuring the study period, 90 patients underwent POEM for treatment of esophageal dysmotility disorders. Age, sex, race, indications for POEM, and BMI were not significant between those with or without narcotic use. There were no differences in procedure time, pre-procedure ES, or length of stay. Post-procedure ES were higher in the active narcotic user group compared to the no prior history group (2.73 vs. 1.2, p = .004). Distensibility indices (DI) measured with EndoFLIP were not different in narcotic users compared with opioid naïve subjects. ConclusionActive narcotic use negatively impacts symptom improvement following POEM for treatment of esophageal motility disorders.

Peroral Endoscopic Myotomy (POEM) and Laparoscopic Heller Myotomy with Dor Fundoplication for Esophagogastric Junction Outflow Obstruction (EGJOO): a Comparison of Outcomes and Impact on Physiology

IntroductionEsophagogastric junction outflow obstruction (EGJOO) is an esophageal motility disorder characterized by failure of lower esophageal sphincter (LES) relaxation with preserved peristalsis. Studies have shown that Heller myotomy with Dor fundoplication (HMD) and per oral endoscopic myotomy (POEM) are effective treatments for EGJOO. However, there is paucity of data comparing the efficacy and impact of these two procedures. Therefore, the aim of this study was to compare outcomes and impact on esophageal physiology in patients undergoing HMD or POEM for primary EGJOO. MethodsThis was a retrospective review of patients who underwent either HMD or POEM for primary EGJOO at our institution between 2013 and 2021. Favorable outcome was defined as an Eckardt score ≤ 3 at 1 year after surgery. GERD–HRQL questionnaire, endoscopy, pH monitoring, and high-resolution manometry (HRM) results at baseline and 1 year after surgery were compared pre- and post-surgery and between groups. Objective GERD was defined as DeMeester score > 14.7 or LA grade C/D esophagitis. ResultsThe final study population consisted of 52 patients who underwent HMD (n = 35) or POEM (n = 17) for EGJOO. At a mean (SD) follow-up of 24.6 (15.3) months, favorable outcome was achieved by 30 (85.7%) patients after HMD and 14 (82.4%) after POEM (p = 0.753). After HMD, there was a decrease GERD-HRQL total score (31 (22–45) to 4 (0–19); p < 0.001), and objective reflux (54.2 to 25.9%; p = 0.033). On manometry, there was a decrease in LES resting pressure (48 (34–59) to 13 (8–17); p < 0.001) and IRP (22 (17–28) to 8 (3–11); p < 0.001), but esophageal body characteristics did not change (p > 0.05). Incomplete bolus clearance improved (70% (10–90) to 10% (0–40); p = 0.010). After POEM, there was no change in the GERD-HRQL total score (p = 0.854), but objective reflux significantly increased (0 to 62%; p < 0.001). On manometry, there was a decrease in LES resting pressure (43 (30–68) to 31 (5–34); p = 0.042) and IRP (23 (18–33) to 12 (10–32); p = 0.048), DCI (1920 (1600–5500) to 0 (0–814); p = 0.035), with increased failed swallows (0% (0–30) to 100% (10–100); p = 0.032). Bolus clearance did not improve (p = 0.539). Compared to HMD, POEM had a longer esophageal myotomy length (11 (7–15)-vs-5 (5–6); p = 0.001), more objective reflux (p = 0.041), lower DCI (0 (0–814)-vs-1695 (929–3101); p = 0.004), and intact swallows (90 (70–100)-vs-0 (0–40); p = 0.006), but more failed swallows (100 (10–100); p = 0.018) and incomplete bolus clearance (90 (90–100)-vs-10 (0–40); p = 0.004). ConclusionPeroral endoscopic myotomy and Heller myotomy with Dor fundoplication are equally effective at relieving EGJOO symptoms. However, POEM causes worse reflux and near complete loss of esophageal body function. Graphical Abstract [Display omitted]

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.

Surgical approaches for achalasia and obesity: a systematic review and patient-level meta-analysis

PurposeSynchronous and metachronous presentations of achalasia and obesity are increasingly common. There is limited data to guide the combined or staged surgical approaches to these conditions.MethodsA systematic review (MEDLINE, Embase, and Web of Science) and patient-level meta-analysis of published cases were performed to examine the most effective surgical approach for patients with synchronous or metachronous presentations of achalasia and obesity.ResultsThirty-three studies with 93 patients were reviewed. Eighteen patients underwent concurrent achalasia and bariatric surgery, with the most common (n = 12, 72.2%) being laparoscopic Heller’s myotomy (LHM) and Roux-en-Y gastric bypass (RYGB). This combination achieved 68.9% excess weight loss and 100% remission of achalasia (mean follow-up: 3 years). Seven (6 RYGB, 1 biliopancreatic diversion) patients had bariatric surgery following achalasia surgery. Of these, all 6 RYGBs had satisfactory bariatric outcomes, with complete remission of their achalasia (mean follow-up: 1.8 years). Sixty-eight patients underwent myotomy following bariatric surgery; the majority (n = 55, 80.9%) were following RYGB. In this scenario, per-oral endoscopic myotomy (POEM) achieved higher treatment success than LHM (n = 33 of 35, 94.3% vs. n = 14 of 20, 70.0%, p = 0.021). Moreover, conversion to RYGB following a restrictive bariatric procedure during achalasia surgery was also associated with higher achalasia treatment success.ConclusionIn patients with concurrent achalasia and obesity, LHM and RYGB achieved good outcomes for both pathologies. For those with weight gain post-achalasia surgery, RYGB provided satisfactory weight loss, without adversely affecting achalasia symptoms. For those with achalasia after bariatric surgery, POEM and conversion to RYGB produced greater treatment success.

A bibliometric analysis of peroral endoscopic myotomy for achalasia: Where have we been and where should we go next?

Peroral endoscopic myotomy (POEM), a treatment for achalasia, has experienced more than ten years of development with significant global progress. We conducted a bibliometrics analysis to reveal the publication trend, influential representative and their cooperation, knowledge base, and research hotspots in this field.

Management of delayed bleeding of upper gastrointestinal endoscopic submucosal tunneling procedures: a retrospective single-center analysis and brief meta-analysis.

Delayed bleeding is a rare but important major adverse event (mAE) after endoscopic submucosal tunneling procedures (ESTP), which is scarcely reported. We aimed to characterize the clinical characteristics of delayed bleeding and provide better management of this mAE. From August 2010 to October 2022, we reviewed 3852 patients with achalasia receiving peroral endoscopic myotomy (POEM) and 1937 patients with upper gastrointestinal tumors receiving submucosal tunneling endoscopic resection (STER). Among these, records of 22 patients (15 POEM, 7 STER) with delayed bleeding were collected. Clinical characteristics, treatment, and outcomes of delayed bleeding were analyzed. The mean age was 43.6years. Ten patients (45.5%) were intratunnel bleeding, seven (31.8%) were intratunnel bleeding accompanied by mucosal bleeding, and five (22.7%) were mucosal bleeding. The most common accompanied symptoms were hematemesis, fever, and melena. The most common accompanied mAEs were fistula, pulmonary inflammation, and pleural effusion with atelectasis. The mean duration from ESTP to endoscopic intervention was 5.3±4.9days. Active bleeding was identified in 21 patients (95.5%). The bleeding was successfully controlled by electrocoagulation (19 cases), endoscopic clipping (six cases), and Sengstaken-Blakemore tube insertion (three cases), and no patient required surgical intervention. The mean hemostatic procedure duration was 61.8±45.8min. The mean post-bleeding hospital stay was 10.0±6.2days. A brief meta-analysis of previous studies showed the pooled estimate delayed bleeding rate after POEM, STER, and G-POEM was 0.4%. Delayed bleeding is uncommon and could be effectively managed by timely emergency endoscopic procedures without requiring subsequent surgical interventions.

Feasibility of peroral endoscopic myotomy with a disposable endoscope platform

Video 1Demonstration of a successful peroral endoscopic myotomy using a novel disposable scope platform.

Using impedance planimetry to define the end of a peroral endoscopic myotomy.

Peroral endoscopic myotomy (POEM) is a minimally invasive endoscopic option for management of achalasia. Adequate distal myotomy is necessary for relief of symptoms, but when too long may also increase risk of reflux. The objective of this study is to evaluate clinical outcomes after POEM and final length of gastric myotomy using impedance planimetry (EndoFLIP). A retrospective review of 34 consecutive patients undergoing POEM with EndoFLIP were included. EndoFLIP measurements, including esophagogastric junction distensibility index (DI), minimum diameter (Dmin), and cross-sectional area (CSA) were recorded at 30- and 40-mL balloon-fill pre- and post- myotomy. The myotomy was considered complete when DI ≥ 3.4 mm2/mmHg. Postoperative Eckardt score (ES) was determined at initial postoperative visit and most recent follow-up. Linear and logistic regression were used to evaluate the association between gastric myotomy length and post-myotomy EndoFLIP measurements on postoperative ES and GERD. Wilcoxon rank-sum test was used to compare gastric myotomy lengths and EndoFLIP parameters in relation to clinical success and development of GERD, and paired t-test to compare EndoFLIP measurements and ES pre- and post-myotomy. Final length of gastric myotomy measured 1cm in 1 (2.9%), 1.5cm in 11 (32.4%), 2.0cm in 19 (55.9%), and 2.5cm in 3 (8.8%) patients. Mean preoperative ES was 6.6 ± 2.2. All patients achieved ES < 3 postoperatively, which was maintained in 88.5% of patients at a median of 7.5months of follow-up. Gastric myotomy length and post-myotomy EndoFLIP values were not associated with postoperative Eckardt scores or GERD. Early and late symptom relief was achieved in 100 and 88.5% of patients, respectively, at a gastric myotomy length of 1-2.5cm. Using EndoFLIP to define a completed myotomy at DI of 3.4 mm2/mmHg yielded variable lengths of gastric myotomy.

Short-term Outcome of Peroral Endoscopic Myotomy Performed by the Same Endoscopist on Achalasia and Nonachalasia Esophageal Motility Disorders.

Peroral endoscopic myotomy (POEM) is a relatively new but increasingly therapeutic option for achalasia. In recent years, POEM has been used for nonachalasia esophageal motility disorders (NAEMDs), such as diffuse esophageal spasm, esophagogastric junction outlet obstruction, and hypercontractile disorder, with some clinical success. No studies thus far compare the outcomes of these two groups. We perform the first head-to-head comparison of outcomes after POEM in patients with achalasia and NAEMD. A retrospective analysis of all patients undergoing POEM at one university hospital by a single expert endoscopist from July 2021 to December 2022 was performed. All patients were symptomatic, and the presence of esophageal motility disorders was confirmed using multiple diagnostic modalities. These patients were then divided into 2 groups, achalasia and NAEMD, based on the underlying diagnosis. Statistical analysis of different clinical outcomes, including effectiveness and safety, was performed. Thirty-seven patients (mean age: 59.55, females: 22) underwent POEM in the study period. Twenty patients had achalasia and 17 patients had NAEMD. The median myotomy length was 5.5 cm for the achalasia group and 10 cm for the NAEMD group. This excluded patients with esophagogastric junction outlet obstruction in which the median myotomy length was 3 cm. The procedure time, the duration of hospital stays, the rates of same-day discharge, and complications were similar between the two. Short-term outcomes of POEM for the two groups were similar with improvement in 94% of patients in the achalasia group and 93.75% in the NAEMD group. Contrary to prior observations, our study highlights that POEM is equally effective in achieving clinical improvement in patients with NAEMD as achalasia over 6 months of follow-up. In addition, POEM has a comparable safety profile in both patient groups making it a feasible therapeutic option for these debilitating and challenging disorders.

Healthcare Utilization, Costs and Other Outcomes of Peroral Endoscopic Myotomy (POEM) Versus Heller Myotomy in the Inpatient Management of Achalasia in The United States: A 2016 to 2020 Nationwide Study

Introduction: Per-Oral Endoscopic Myotomy (POEM) is the recommended first-line treatment for all achalasia subtypes due to its minimally invasive nature. We aim to evaluate the trends of utilization, costs, and outcomes (mortality and complications) of POEM versus Heller Myotomy (HM) in U.S. hospitals. Methods: This is a retrospective study of individuals admitted with a primary diagnosis of achalasia. Data was obtained from Nationwide Inpatient Sample databases from the years 2016 to 2020 using ICD-10 codes. We assessed the therapeutic procedures employed, the trends and outcomes associated with POEM versus HM in terms of hospital utilization, mortality, morbidity, and the baseline characteristics of our study population. Results: A total of 26 880 adult individuals were diagnosed with achalasia. Of these, 11% underwent POEM, while 59% underwent HM. POEM rates increased from 6% to 10% of achalasia admissions, while HM decreased from 49% to 41% during the study period. No significant differences in total hospital charges or length of stay were observed between the 2 procedures. Regarding procedural complications, HM was associated with significantly reduced odds of pneumonia (adjusted Odds Ratio [aOR] = 0.09, 95% CI: 0.02-0.41), pneumoperitoneum (aOR = 0.11, 95% CI: 0.03-0.36), and pneumomediastinum (aOR = 0.21, 95% CI: 0.06-0.68), with no difference in the odds of esophageal perforation (aOR = 1.33, 95% CI: 0.27-6.48) and sepsis (aOR = 2.04, 95% CI: 0.22-18.40). Conclusion: While HM rates are currently declining in the U.S., POEM usage appears to be increasing. Despite being a less invasive measure than HM, POEM remains underutilized in the U.S.

Protocol for an international multicenter randomized controlled trial assessing treatment success and safety of peroral endoscopic myotomy vs endoscopic balloon dilation for the treatment of achalasia in children.

Achalasia is a rare neurodegenerative esophageal motility disorder characterized by incomplete lower esophageal sphincter (LES) relaxation, increased LES tone and absence of esophageal peristalsis. Achalasia requires invasive treatment in all patients. Conventional treatment options include endoscopic balloon dilation (EBD) and laparoscopic Heller's myotomy (LHM). Recently, a less invasive endoscopic therapy has been developed; Peroral Endoscopic Myotomy (POEM). POEM integrates the theoretical advantages of both EBD and LHM (no skin incisions, less pain, short hospital stay, less blood loss and a durable myotomy). Our aim is to compare efficacy and safety of POEM vs. EBD as primary treatment for achalasia in children. This multi-center, and center-stratified block-randomized controlled trial will assess safety and efficacy of POEM vs EBD. Primary outcome measure is the need for retreatment due to treatment failure (i.e. persisting symptoms (Eckardt score > 3) with evidence of recurrence on barium swallow and/or HRM within 12 months follow-up) as assed by a blinded end-point committee (PROBE design). This RCT will be the first one to evaluate which endoscopic therapy is most effective and safe for treatment of naïve pediatric patients with achalasia.

S1313 Predictors of Mortality After Heller Myotomy and Peroral Endoscopic Myotomy in Achalasia

S1313 Predictors of Mortality After Heller Myotomy and Peroral Endoscopic Myotomy in Achalasia

S1220 Costs Associated With Routine Post-Procedural Surveillance Imaging After Peroral Endoscopic Myotomy: A Quality Initiative

S1220 Costs Associated With Routine Post-Procedural Surveillance Imaging After Peroral Endoscopic Myotomy: A Quality Initiative

S1312 Predictors of Complications After Heller Myotomy and Peroral Endoscopic Myotomy in Achalasia

S1312 Predictors of Complications After Heller Myotomy and Peroral Endoscopic Myotomy in Achalasia

Our experience with peroral endoscopic myotomy complications: A case series

Abstract Achalasia is characterized by the failure of smooth muscle relaxation in the lower part of the esophagus. During peroral endoscopic myotomy (POEM), creating a submucosal tunnel and performing a myotomy can inadvertently create openings between the submucosal space and the mediastinum, retroperitoneal cavity, and intraperitoneal cavity. When carbon dioxide (CO2) is insufflated during the procedure, it can pass through these openings, leading to conditions such as capnothorax, capnomediastinum, capnoperitoneum, or subcutaneous emphysema. In some cases, emergency management may be required. Three of our four patients who experienced these complications developed subcutaneous emphysema, while one had pneumoperitoneum and pneumothorax. Only one of these patients needed medical intervention, while the other three did not. It is now recognized that these complications are an expected part of the procedure rather than unexpected outcomes. Therefore, it is recommended to manage them conservatively unless they cause significant cardiorespiratory distress. In conclusion, having a good understanding of the procedure and remaining vigilant can help ensure the safe execution of POEM, even when these complications arise.

S1891 Long Term Outcomes (≥ 3 Years) Following Gastric Peroral Endoscopic Myotomy for Gastroparesis: A Systematic Review and Meta-Analysis

S1891 Long Term Outcomes (≥ 3 Years) Following Gastric Peroral Endoscopic Myotomy for Gastroparesis: A Systematic Review and Meta-Analysis

S1304 Efficacy and Safety of Gastric Peroral Endoscopic Myotomy for Refractory Gastroparesis

S1304 Efficacy and Safety of Gastric Peroral Endoscopic Myotomy for Refractory Gastroparesis