CRITICAL ANALYSIS OF HYPERCONTRACTILE WAVES VIGOR TO DEFINE HYPERCONTRACTILE ESOPHAGUS DISEASE.

BACKGROUND: The current definition for hypercontractile esophagus was arbitrarily set at the uppermost range in volunteers for a specific equipment. OBJECTIVE: This study aims to critically analyze the concept of hypercontractile waves to redefine hypercontractile esophagus parameters. METHODS: We reviewed 500 unselected and consecutive HRM tests (5000 waves) performed in a water -perfused system. RESULTS: Mean distal contractility integral (DCI) was 825±1492 (0-42775) mmHg.cm.s, two standard deviations above average = 3810; 95th percentile = 2798 mmHg.cm.s. CONCLUSION: In healthy volunteers, two standard deviations above average is 4000 mmHg.cm.s, we thus suggest this value to define hypercontractile waves and define hypercontractile esophagus in a water-perfused HRM system.

The evolution of the treatment of esophageal achalasia. Chronicle of a 35-year journey.

Over the last few decades, significant improvement has been made in both the evaluation and treatment of esophageal achalasia. The Chicago classification, today in version 4.0, is now the standard for diagnosis of achalasia, providing a classification into 3 subtypes with important therapeutic and prognostic implications. Therapy, which was at first mostly limited to pneumatic dilatation, today includes minimally invasive surgery and peroral endoscopic myotomy, allowing for a more tailored approach to patients and better treatment of recurrent symptoms. This review chronicles my personal experience with achalasia over the last 35 years, describing the progress made in the treatment of patients with achalasia.

Laparoscopic heller myotomy versus peroral endoscopic myotomy for the treatment of achalasia.

PURPOSE OF REVIEW: To compare different therapeutic modalities and determine their role in the treatment of esophageal achalasia. RECENT FINDINGS: The last 3 decades have seen a significant improvement in the diagnosis and treatment of esophageal achalasia. Conventional manometry has been replaced by high-resolution manometry, which has determined a more precise classification of achalasia in three subtypes, with important treatment implications. Therapy, while still palliative, has evolved tremendously. While pneumatic dilatation was for a long time the main choice of treatment, this approach slowly changed at the beginning of the nineties when minimally invasive surgery was adopted, initially thoracoscopically and then laparoscopically with the addition of partial fundoplication. And in 2010, the first report of a new endoscopic technique - peroral endoscopic myotomy (POEM) - was published, revamping the interest in the endoscopic treatment of achalasia. SUMMARY: This review focuses particularly on the comparison of POEM and laparoscopic Heller myotomy (LHM) with partial fundoplication as primary treatment modality for esophageal achalasia. Based on the available data, we believe that LHM with partial fundoplication should be the primary treatment modality in most patients. POEM should be selected when surgical expertise is not available, for type III achalasia, for the treatment of recurrent symptoms, and for patients who had prior abdominal operations that would make LHM challenging and unsafe.

Modern insights into the pathophysiology and treatment of pseudoachalasia.

BACKGROUND: Secondary achalasia or pseudoachalasia is a clinical presentation undistinguishable from achalasia in terms of symptoms, manometric, and radiographic findings, but associated with different and identifiable underlying causes. METHODS: A literature review was conducted on the PubMed database restricting results to the English language. Key terms used were "achalasia-like" with 63 results, "secondary achalasia" with 69 results, and "pseudoachalasia" with 141 results. References of the retrieved papers were also manually reviewed. RESULTS: Etiology, diagnosis, and treatment were reviewed. CONCLUSIONS: Pseudoachalasia is a rare disease. Most available evidence regarding this condition is based on case reports or small retrospective series. There are different causes but all culminating in outflow obstruction. Clinical presentation and image and functional tests overlap with primary achalasia or are inaccurate, thus the identification of secondary achalasia can be delayed. Inadequate diagnosis leads to futile therapies and could worsen prognosis, especially in neoplastic disease. Routine screening is not justifiable; good clinical judgment still remains the best tool. Therapy should be aimed at etiology. Even though Heller's myotomy brings the best results in non-malignant cases, good clinical judgment still remains the best tool as well.

High-resolution 3-dimensional tomography may be a useful tool for understanding the anatomy of hiatal hernias and surgical planning of patients eligible for laparoscopic or robotic antireflux surgery.

BACKGROUND: 3D computed tomography (CT) has been seldom used for the evaluation of hiatal hernias (HH) in surgical patients. This study aims to describe the 3D CT findings in candidates for laparoscopic or robotic antireflux surgery or HH repair and compare them with other tests. METHODS: Thirty patients with HH and/or gastroesophageal reflux disease (GERD) who were candidates for surgical treatment and underwent high-resolution CT were recruited. The variables studied were distance from the esophagogastric junction (EGJ) to the hiatus; total gastric volume and herniated gastric volume, percentage of herniated volume in relation to the total gastric volume; diameters and area of the esophageal hiatus. RESULTS: HH was diagnosed with CT in 21 (70%) patients. There was no correlation between the distance EGJ-hiatus and the herniated gastric volume. There was a statistically significant correlation between the distance from the EGJ to the hiatus and the area of the esophageal hiatus of the diaphragm. There was correlation between tomographic and endoscopic findings for the presence and size of HH. HH was diagnosed with manometry in 9 (50%) patients. There was no correlation between tomographic and manometric findings for the diagnosis of HH and between hiatal area and lower esophageal sphincter basal pressure. There was no correlation between any parameter and DeMeester score. CONCLUSIONS: The anatomy of HH and the hiatus can be well defined by 3D CT. The EGJ-hiatus distance may be equally measured by 3D CT or upper digestive endoscopy. DeMeester score did not correlate with any anatomical parameter.

Laparoscopic Sleeve Gastrectomy Lacks Intrasurgeon and Intersurgeon Agreement in Technical Key Points That May Affect Gastroesophageal Reflux Disease After the Procedure.

PURPOSE: Gastroesophageal reflux disease (GERD) after sleeve gastrectomy (SG) may be related to surgical technique. The fact that there is a lack of technical standardization may explain large differences in GERD incidence. The aim of this study is to evaluate auto- and hetero-agreement for SG technical key points based on recorded videos. METHODS: Ten experienced (minimum of 5 years performing bariatric surgery, minimum of 30 SG per year) bariatric surgeons (9 (90%) males) were selected. Participants were invited to send an unedited video with a typical laparoscopic SG (first round of the Delphi process). Videos were cropped into small clips comprising 11 key points of the technique. All anonymized clips (including their own) were returned to all surgeons. Individuals were asked to agree or not with the technique demonstrated (second round). The percentage of agreement was presented to the entire group that was asked for a second vote (third round). RESULTS: Agreement was poor/fair for all points except hiatal repair that had a very good agreement in the second round. For the third round, there was a slight increase in agreement for distance esophagogastric junction/proximal stapling and gastric mobilization for stapling and a slight decrease in agreement for gastric tube final shape. Only 1 (10%) surgeon recognized that he evaluated his own video. Five (50%) surgeons disagreed with themselves on 1 or more points. CONCLUSION: SG lacks intrasurgeon and intersurgeon agreement in technical key points that may justify significant differences in GERD incidence after the procedure.

Esophageal high-resolution manometry demands visual interpretation in addition to mathematical software-based analysis.

PURPOSE: Esophageal high-resolution manometry (HRM) revolutionized esophageal function testing due to the intuitive colorful and agreeable-to-the-eyes plots (Clouse plots). HRM execution and interpretation is guided by the Chicago Classification. The well-established metrics for interpretation allows a reliable automatic software analysis. Analysis based on these mathematical parameters, however, ignores the valuable visual interpretation unique to human eyes and based on expertise. METHODS: We compiled some situations where visual interpretation added useful information for HRM interpretation. RESULTS: Visual interpretation may be useful in cases of hypomotility, premature waves, artifacts, segmental abnormalities of peristalsis, and extra-luminal non-contractile findings. CONCLUSION: These extra findings can be reported apart from the conventional parameters.

Insights into the Paradox of the Weak Association Between Sleeve Gastrectomy and Barrett's Esophagus.

Sleeve gastrectomy (SG) is deemed a refluxogenic operation but with a low incidence of postoperative Barrett´s esophagus (BE). We aimed to shed some light on the potential paradox of the weak association between SG, BE and esophageal adenocarcinoma (EAC). The high incidence of GERD after SG is not followed by an increased rate of BE and EAC, as these rates are similar to the general population. We hypothesized that this paradox may occur due to a difference in the gastro-esophageal reflux composition secondary to a lower content of bile, to a decrease in inflammation due to weight loss and hormonal changes, and to acquisition of healthier habits such as exercise, smoking cessation, and better eating behavior.

The Transdiaphragmatic Pressure Gradient and the Lower Esophageal Sphincter in the Pathophysiology of Gastroesophageal Reflux Disease: an Analysis of 500 Esophageal Function Tests.

BACKGROUND: Gastroesophageal reflux disease (GERD) pathophysiology is multifactorial. Greater importance has been attributed to a defective lower esophageal sphincter (LES) in comparison to an altered transdiaphragmatic pressure gradient (TPG). This study aims to evaluate the role of the TPG and LES disfunction in GERD pathogenesis. METHODS: Five hundred consecutive esophageal function tests from patients with clinically suspected GERD were reviewed. Patients were classified according to the pH monitoring in GERD positive or GERD negative. Abdominal pressure, thoracic pressure, TPG (abdominal-thoracic pressures), LES resting pressure (mid-respiratory, expiratory, and EGJ-CI), and LES retention pressure (LES resting pressure-TPG) were determined. RESULTS: GERD was present in 296 (59%) individuals. GERD-positive patients were mostly males. LES resting pressure (by all parameters) and thoracic pressure were not different between groups. Abdominal pressure and TPG were higher in GERD-positive patients. LES retention pressure (by all parameters) was lower in GERD-positive patients. DeMeester score had a positive correlation with LES resting pressure, TPG, and LES retention pressure (by all parameters) but not with abdominal pressure and thoracic pressure. CONCLUSIONS: LES valvular competency as measured by absolute resting pressure was not reliable to predict GERD; however, it was associated with GERD severity. Relative LES pressure (LES retention pressure) predicted GERD presence and severity, but no parameter showed superiority. TPG plays an important role in the pathophysiology of GERD since it is related to GERD presence and severity; still TPG is altered mostly based on a higher abdominal pressure.

Transthoracic Esophagectomy: Hand-sewn Versus Side-to-side Linear-stapled Versus Circular-stapled Anastomosis: A Systematic Review and Meta-analysis.

BACKGROUND: Three anastomotic techniques are mostly used to create an esophagogastric anastomosis in a transthoracic esophagectomy: hand-sewn (HS), side-to-side linear-stapled (SSLS), and circular-stapled (CS). The aim of this study was to compare surgical outcomes after HS, SSLS, and CS intrathoracic esophagogastric anastomosis. MATERIALS AND METHODS: A systematic review using the MEDLINE database was performed to identify original articles analyzing outcomes after HS, SSLS, and CS esophagogastric anastomosis. The main outcome was an anastomotic leakage rate. Secondary outcomes included overall morbidity, major morbidity, and mortality. A meta-analysis of proportions and linear regression models were used to assess the effect of each anastomotic technique on the different outcomes. RESULTS: A total of 101 studies comprising 12,595 patients were included; 8835 (70.1%) with CS, 2532 (20.1%) with HS, and 1228 (9.8%) with SSLS anastomosis. Anastomotic leak occurred in 10% [95% confidence interval (CI), 6%-15%], 9% (95% CI, 6%-13%), and 6% (95% CI, 5%-7%) of patients after HS, SSLS, and CS anastomosis, respectively. Risk of anastomotic leakage was significantly higher with HS anastomosis (odds ratio=1.73, 95% CI: 1.47-2.03, P<0.0001) and SSLS (odds ratio=1.68, 95% CI: 1.36-2.08, P<0.0001), as compared with CS. Overall morbidity (HS: 52% vs. SLSS: 39% vs. CS: 35%) and major morbidity (HS: 33% vs. CS: 19%) rates were significantly lower with CS anastomosis. Mortality rate was 4% (95% CI, 3%-6%), 2% (95% CI, 2%-3%), and 3% (95% CI, 3%-4%) after HS, SSLS, and CS anastomosis, respectively. CONCLUSION: HS and SSLS intrathoracic esophagogastric anastomoses are associated with significantly higher rates of an anastomotic leak than CS anastomosis.