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McEwan P, Bøg M, Faurby M, Foos V, Lingvay I, Lübker C, Miller R, Toliver JC, Yeates F, Lincoff AM. Cost-effectiveness of semaglutide in people with obesity and cardiovascular disease without diabetes. J Med Econ 2025; 28:268-278. [PMID: 39882599 DOI: 10.1080/13696998.2025.2459529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2024] [Revised: 01/24/2025] [Accepted: 01/24/2025] [Indexed: 01/31/2025]
Abstract
AIMS The cardioprotective effects of semaglutide 2.4 mg reported in the SELECT cardiovascular (CV) outcomes trial (ClinicalTrials.gov NCT03574597) provide clinical benefit for subjects with overweight or obesity and established CV disease without type 2 diabetes (T2D). We assessed cost-effectiveness of semaglutide 2.4 mg in this population against the American College of Cardiology/American Heart Association value framework. MATERIALS AND METHODS A cohort-level Markov-state cost-effectiveness model using trial-derived data with outcomes from a healthcare sector perspective measured over a lifetime horizon was developed. Treatment costs were based on US list prices; scenario analyses used literature-reported estimated rebates. Healthcare costs and benefits were discounted at 3.0%. A simulated cohort of 100,000 subjects was aligned to the SELECT trial population baseline characteristics and time-on-treatment. Subjects received either semaglutide 2.4 mg or placebo in addition to standard of care (SoC). Modelled outcomes included clinical events (CV events, progression to T2D, chronic kidney disease [CKD]) and health economic measures, including direct costs and quality-adjusted life years (QALYs). RESULTS Mean semaglutide 2.4 mg treatment duration was 2.79 years. Per 100,000 subjects, treatment avoided 2,791 non-fatal myocardial infarctions, 3,000 coronary revascularizations, 487 non-fatal strokes, and 115 CV deaths over the modeled lifetime horizon. Average per-subject lifetime treatment costs were $47,353; savings arose from avoided T2D ($14,431), CKD ($2,074), and CV events ($1,512). Semaglutide 2.4 mg was associated with increased lifetime costs ($29,767), additional QALYs gained (0.218) and an incremental cost-effectiveness ratio of $136,271/QALY at list price; a scenario using an empirically estimated 48% rebate predicted $32,219/QALY. LIMITATIONS The generalizability of observations from SELECT to a broader US population is unknown. Our model does not capture all outcomes nor costs that may be affected by weight loss. Modeling assumptions may present limitations. CONCLUSIONS Semaglutide 2.4 mg use as in SELECT is cost-effective at list price, using a $150,000/QALY willingness-to-pay threshold.
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Affiliation(s)
- Phil McEwan
- Health Economics, Health Economics and Outcomes Research Ltd, Cardiff, UK
| | | | - Mads Faurby
- Novo Nordisk Inc, Plainsboro, New Jersey, USA
| | - Volker Foos
- Health Economics, Health Economics and Outcomes Research Ltd, Cardiff, UK
| | - Ildiko Lingvay
- Department of Internal Medicine (Endocrinology Division) and Peter O'Donnel Jr. School of Public Health, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | | | - Ryan Miller
- Health Economics, Health Economics and Outcomes Research Ltd, Cardiff, UK
| | | | - Florian Yeates
- Health Economics, Health Economics and Outcomes Research Ltd, Cardiff, UK
| | - A Michael Lincoff
- Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, Ohio, USA
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Desai M, Ruan W, Thosani NC, Amaris M, Scott JS, Saeed A, Abu Dayyeh B, Canto MI, Abidi W, Alipour O, Amateau SK, Cosgrove N, Elhanafi SE, Forbes N, Kohli DR, Kwon RS, Fujii-Lau LL, Machicado JD, Marya NB, Ngamruengphong S, Pawa S, Sheth SG, Thiruvengadam NR, Qumseya BJ. American Society for Gastrointestinal Endoscopy guideline on the diagnosis and management of GERD: summary and recommendations. Gastrointest Endosc 2025; 101:267-284. [PMID: 39692638 DOI: 10.1016/j.gie.2024.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2024] [Accepted: 10/05/2024] [Indexed: 12/19/2024]
Abstract
This clinical practice guideline from the American Society for Gastrointestinal Endoscopy (ASGE) provides an evidence-based approach for strategies to diagnose and manage GERD. This document was developed using the Grading of Recommendations Assessment, Development, and Evaluation framework and serves as an update to the 2014 ASGE guideline on the role of endoscopy in the management of GERD. This updated guideline addresses the indications for endoscopy in patients with GERD as well as in the emerging population of patients who develop GERD after sleeve gastrectomy or peroral endoscopic myotomy. It also discusses how to endoscopically evaluate gastroesophageal junctional integrity in a comprehensive and uniform manner. Importantly, this guideline also discusses management strategies for GERD including the role of lifestyle interventions, proton pump inhibitors (PPIs), and endoscopic antireflux therapy (including transoral incisionless fundoplication [TIF], radiofrequency energy, and combined hiatal hernia repair and TIF [cTIF]) in the management of GERD. The ASGE suggests upper endoscopy for the evaluation of GERD in patients with alarm symptoms, with multiple risk factors for Barrett's esophagus, and with a history of sleeve gastrectomy. The ASGE recommends careful endoscopic evaluation, reporting, and photo-documentation of objective GERD findings with attention to gastroesophageal junction landmarks and integrity in patients who undergo upper endoscopy to improve care. In patients with GERD symptoms, the ASGE recommends lifestyle modifications. In patients with symptomatic and confirmed GERD with predominant heartburn symptoms, the ASGE recommends medical management including PPIs at the lowest dose for the shortest duration possible while initiating discussion about long-term management options. In patients with confirmed GERD with small hiatal hernias (≤2 cm) and Hill grade I or II who meet specific criteria, the ASGE suggests evaluation for TIF as an alternative to chronic medical management. In patients with persistent GERD with large hiatal hernias (> 2cm) and Hill grade III or IV, the ASGE suggests either cTIF or surgical therapy based on multidisciplinary review. This document summarizes the methods, analyses, and decision processes used to reach the final recommendations and represents the official ASGE recommendations on the above topics.
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Affiliation(s)
- Madhav Desai
- Center for Interventional Gastroenterology at UTHealth, McGovern Medical School, Houston, Texas, USA
| | - Wenly Ruan
- Division of Pediatric Gastroenterology, Hepatology and Nutrition, Baylor College of Medicine, Texas Children's Hospital, Houston, Texas, USA
| | - Nirav C Thosani
- Center for Interventional Gastroenterology at UTHealth, McGovern Medical School, Houston, Texas, USA
| | - Manuel Amaris
- Department of Gastroenterology, Hepatology, and Nutrition, University of Florida, Gainesville, Florida, USA
| | - J Stephen Scott
- Bariatric & Metabolic Specialists, Overland Park, Kansas, USA
| | - Ahmed Saeed
- Advanced Gastroenterology Associates, Overland Park, Kansas, USA
| | - Barham Abu Dayyeh
- Department of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Marcia Irene Canto
- Division of Gastroenterology and Hepatology, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Wasif Abidi
- Division of Gastroenterology, Baylor College of Medicine, Houston, Texas, USA
| | - Omeed Alipour
- Division of Gastroenterology, University of Washington Medical Center, Seattle, Washington, USA
| | - Stuart K Amateau
- Division of Gastroenterology Hepatology and Nutrition, University of Minnesota Medical Center, Minneapolis, Minnesota, USA
| | - Natalie Cosgrove
- Center for Interventional Endoscopy, AdventHealth, Orlando, Florida, USA
| | - Sherif E Elhanafi
- Division of Gastroenterology, Texas Tech University Health Sciences Center, El Paso, Texas, USA
| | - Nauzer Forbes
- Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Divyanshoo R Kohli
- Pancreas and Liver Clinic, Providence Sacred Medical Center, Elon Floyd School of Medicine, Washington State University, Spokane, Washington, USA
| | - Richard S Kwon
- Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, Michigan, USA
| | | | - Jorge D Machicado
- Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, Michigan, USA
| | - Neil B Marya
- Division of Gastroenterology and Hepatology, University of Massachusetts Medical Center, Worcester, Massachusetts, USA
| | - Saowanee Ngamruengphong
- Division of Gastroenterology and Hepatology, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Swati Pawa
- Department of Gastroenterology, Wake Forest School of Medicine, Winston Salem, North Carolina, USA
| | - Sunil G Sheth
- Division of Gastroenterology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Nikhil R Thiruvengadam
- Division of Gastroenterology and Hepatology, Loma Linda University, Loma Linda, California, USA
| | - Bashar J Qumseya
- Department of Gastroenterology, Hepatology, and Nutrition, University of Florida, Gainesville, Florida, USA
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3
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DeWitt JM. Who should receive and how should we perform transoral incisionless fundoplication for treatment of GERD? Gastrointest Endosc 2025; 101:103-105. [PMID: 39701616 DOI: 10.1016/j.gie.2024.09.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2024] [Accepted: 09/15/2024] [Indexed: 12/21/2024]
Affiliation(s)
- John M DeWitt
- Department of Gastroenterology and Hepatology, Indiana University Health Medical Center, Indianapolis, Indiana, USA
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Canto MI, Diehl DL, Parker B, Abu-Dayyeh BK, Kolb JM, Murray M, Sharaiha RZ, Brewer Gutierrez OI, Sohagia A, Khara HS, Janu P, Chang K. Outcomes of transoral incisionless fundoplication (TIF 2.0): a prospective multicenter cohort study in academic and community gastroenterology and surgery practices (with video). Gastrointest Endosc 2025; 101:90-102.e1. [PMID: 39293690 DOI: 10.1016/j.gie.2024.08.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Revised: 07/13/2024] [Accepted: 08/15/2024] [Indexed: 09/20/2024]
Abstract
BACKGROUND AND AIMS Transoral incisionless fundoplication (TIF) is an established safe endoscopic technique for the management of GERD but with variable efficacy. In the past decade, the TIF technology and technique have been optimized and more widely accepted, but data on outcomes outside clinical trials are limited. We tracked patient-reported and clinical outcomes of GERD patients after TIF 2.0. METHODS Patients with body mass index <35 kg/m2, hiatal hernia <2 cm, and confirmed GERD with typical or atypical symptoms from 9 academic and community medical centers were enrolled in a prospective registry and underwent TIF 2.0 performed by gastroenterologists and surgeons. The primary outcomes were safety and clinical success (response in 1 subjective and at least 1 of 3 objective secondary end points). Secondary end points were symptom improvement, acid exposure time (AET), esophagitis healing, proton pump inhibitor (PPI) use, and satisfaction. Outcomes were assessed at last follow-up within 12 months. RESULTS A total of 85 patients underwent TIF 2.0, and 81 were included in the outcomes analysis. Clinical success was achieved in 94%, GERD Health-Related Quality of Life scores improved in 89%, and elevated Reflux Symptom Index score normalized in 85% of patients with elevated baseline. Patient satisfaction improved from 8% to 79% (P < .0001). At baseline, 81% were taking at least daily PPI, and after TIF 2.0, 80% were on no or occasional PPI (P < .0001). Esophageal AET was normal in 72%, greater with an optimized TIF 2.0 valve (defined as >300-degree circumference and >3-cm length; 94% vs 57%; P = .007). There were no TIF 2.0-related serious adverse events. CONCLUSIONS TIF 2.0 is a safe and effective endoscopic outpatient treatment option for selected patients with GERD.
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Affiliation(s)
- Marcia Irene Canto
- Division of Gastroenterology, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - David L Diehl
- Department of Gastroenterology, Geisinger Medical Center, Danville, Pennsylvania
| | - Brett Parker
- Department of Surgery, Johns Hopkins Sibley Memorial Hospital, Washington, DC
| | - Barham K Abu-Dayyeh
- Department of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota
| | - Jennifer M Kolb
- Digestive Health Institute, University of California, Irvine, California
| | - Michael Murray
- Department of Surgery, Northern Nevada Medical Center, Sparks, Nevada
| | - Reem Z Sharaiha
- Department of Gastroenterology, Weil-Cornell Medical Center, New York, New York
| | | | - Amit Sohagia
- Department of Gastroenterology, Geisinger Medical Center, Scranton, Pennsylvania
| | - Harshit S Khara
- Department of Gastroenterology, Geisinger Medical Center, Danville, Pennsylvania
| | - Peter Janu
- Department of Surgery, Fox Valley Surgical Specialists, Appleton, Wisconsin
| | - Kenneth Chang
- Digestive Health Institute, University of California, Irvine, California
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5
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Desai M, Ruan W, Thosani NC, Amaris M, Scott JS, Saeed A, Abu Dayyeh B, Canto MI, Abidi W, Alipour O, Amateau SK, Cosgrove N, Elhanafi SE, Forbes N, Kohli DR, Kwon RS, Fujii-Lau LL, Machicado JD, Marya NB, Ngamruengphong S, Pawa S, Sheth SG, Thiruvengadam NR, Qumseya BJ. ASGE guideline on the diagnosis and management of GERD: methodology and review of evidence. VideoGIE 2024. [DOI: 10.1016/j.vgie.2024.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2025] Open
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Maresova P, Rezny L, Hruska J, Klimova B, Swanstrom LL, Kuca K. Diagnosis and treatment of patients with gastroesophageal reflux disease - a systematic review of cost-effectiveness and economic burden. BMC Health Serv Res 2024; 24:1351. [PMID: 39501242 PMCID: PMC11539747 DOI: 10.1186/s12913-024-11781-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Accepted: 10/17/2024] [Indexed: 11/08/2024] Open
Abstract
BACKGROUND This study aims to review the existing knowledge on the cost-effectiveness and item costs related to the diagnosis and treatment of gastroesophageal reflux disease (GERD) patients at different stages. METHODS The study adhered to the PRISMA guidelines. The systematic search involved several steps: finding and identifying relevant articles, filtering them according to the set criteria, and examining the final number of selected articles to obtain the primary information. The number of articles published between 2013 and September 2024 in the Web of Science and PubMed databases was considered. The CHEERS checklist was used for the risk of bias assessment. Ultimately, 36 studies were included. RESULTS Regarding the cost-effectiveness of GERD treatment, Proton pump inhibitors (PPIs) appeared to be the dominant solution for non-refractory patients. However, this might change with the adoption of the novel drug vonoprazan, which is more effective and cheaper. With advancements in emerging technologies, new diagnostic and screening approaches such as Endosheath, Cytosponge, and combined multichannel intraluminal impedance and pH monitoring catheters should be considered, with potential implications for optimal GERD management strategies. DISCUSSION The new diagnostic methods are reliable, safe, and more comfortable than standard procedures. PPIs are commonly used as the first line of treatment for GERD. Surgery, such as magnetic sphincter augmentation or laparoscopic fundoplication, is only recommended for patients with treatment-resistant GERD or severe symptoms. OTHER Advances in emerging technologies for diagnostics and screening may lead to a shift in the entire GERD treatment model, offering less invasive options and potentially improving patients' quality of life.
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Affiliation(s)
- Petra Maresova
- Betthera s.r.o, Hradec Kralove, Czech Republic
- Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Czech Republic
| | - Lukas Rezny
- Betthera s.r.o, Hradec Kralove, Czech Republic
- Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Czech Republic
| | - Jan Hruska
- Betthera s.r.o, Hradec Kralove, Czech Republic
- Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Czech Republic
| | - Blanka Klimova
- Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Czech Republic
| | | | - Kamil Kuca
- Betthera s.r.o, Hradec Kralove, Czech Republic.
- Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Czech Republic.
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Ayoub F, Keihanian T, Zabad N, Jawaid S, Patel K, Othman MO. The role of transoral incisionless fundoplication (TIF) in the management of gastroesophageal reflux disease (GERD) following peroral endoscopic myotomy (POEM): A pilot, prospective, patient-driven study. Saudi J Gastroenterol 2024; 30:266-271. [PMID: 38465439 PMCID: PMC11379255 DOI: 10.4103/sjg.sjg_22_24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 02/02/2024] [Accepted: 02/17/2024] [Indexed: 03/12/2024] Open
Abstract
BACKGROUND Gastroesophageal reflux (GERD) is a concern after peroral endoscopic myotomy (POEM). Transoral incisionless fundoplication (TIF) has been recently described as a possible therapy for post-POEM GERD in case series. METHODS We prospectively enrolled patients undergoing POEM who agreed to participate in objective post-procedure GERD evaluation. Patients with objective evidence of GERD and suitable anatomy were offered TIF vs. proton pump inhibitor (PPI) only. Patients who underwent TIF were compared to those on PPI-only therapy after follow-up. RESULTS Of 21 enrolled POEM patients with objective testing, GERD was found in 11 (52%). Of those eligible for TIF, 4 (40%) opted to pursue TIF and were compared to those on PPI-only therapy ( n = 6). Three months post-TIF, 75% of patients had discontinued or significantly decreased PPI. There were no adverse events. GERD health-related quality of life scores were low and comparable between TIF (3.75 ± 6.2) and those who remained on PPI-only therapy (4.1 ± 5). CONCLUSION In this pilot, patient-driven prospective study, 75% of patients with post-POEM GERD undergoing TIF had stopped or significantly reduced PPI use. Post-POEM TIF is safe and effective and may be a viable alternative to PPI for POEM-related GERD; however, future studies should include a control arm and post-intervention pH monitoring.
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Affiliation(s)
- Fares Ayoub
- Section of Gastroenterology, Hepatology and Nutrition, Baylor College of Medicine, Houston, TX, USA
| | - Tara Keihanian
- Section of Gastroenterology, Hepatology and Nutrition, Baylor College of Medicine, Houston, TX, USA
| | - Noor Zabad
- Section of Gastroenterology, Hepatology and Nutrition, Baylor College of Medicine, Houston, TX, USA
| | - Salmaan Jawaid
- Section of Gastroenterology, Hepatology and Nutrition, Baylor College of Medicine, Houston, TX, USA
| | - Kalpesh Patel
- Section of Gastroenterology, Hepatology and Nutrition, Baylor College of Medicine, Houston, TX, USA
| | - Mohamed O. Othman
- Section of Gastroenterology, Hepatology and Nutrition, Baylor College of Medicine, Houston, TX, USA
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Sreepad B, Chennupati K, Zeeshan MS, Ramzan Z. Endoscopic Management Options for Gastroesophageal Reflux Disease. Cureus 2024; 16:e62069. [PMID: 38989395 PMCID: PMC11235412 DOI: 10.7759/cureus.62069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/09/2024] [Indexed: 07/12/2024] Open
Abstract
Gastroesophageal reflux disease (GERD) is a prevalent condition that affects a significant portion of the Western population. Despite its benign pathophysiology, it has the potential to cause serious complications over time, ranging from conditions that are benign, premalignant, and/or malignant. Traditional treatment options include lifestyle measures, anti-secretory medications (e.g., proton pump inhibitor (PPI)), and surgical options (e.g., Nissen and Toupet fundoplication). However, recent studies have revealed long-term side effects of anti-secretory medications. Moreover, surgical options, though effective, are considered invasive and associated with potential complications. In the current age of ongoing research in minimally invasive options, endoscopic treatment of GERD has become popular. As a result, procedures such as radiofrequency treatment and transoral incisionless fundoplication (TIF) have gained FDA approval and are currently being covered by most insurance. In this review article, we will discuss pre-procedural workup, appropriate patient selection, advantages, disadvantages, procedure techniques, and follow-up of patients who undergo various endoscopic treatments for GERD. In addition, we will review the short and long-term success of these techniques in improving quality of life, use of PPI, and improvement in symptoms considering published data in high-quality peer-reviewed journals.
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Affiliation(s)
- Bhavana Sreepad
- Medical School, TCU Burnett School of Medicine, Fort Worth, USA
| | - Karteek Chennupati
- Gastroenterology, Texas Health Harris Methodist Hospital, Fort Worth, USA
| | | | - Zeeshan Ramzan
- Gastroenterology, Texas Health Harris Methodist Hospital, Fort Worth, USA
- Gastroenterology, TCU Burnett School of Medicine, Fort Worth, USA
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Kolb JM, Chang KJ. The status of endoscopic therapies for gastroesophageal reflux disease. Curr Opin Gastroenterol 2023; 39:326-332. [PMID: 37265186 DOI: 10.1097/mog.0000000000000944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
PURPOSE OF REVIEW Gastroesophageal reflux disease (GERD) is exceedingly common and can significantly impact quality of life through heartburn, troublesome regurgitation, or atypical symptoms. The initial approach is conservative lifestyle changes followed by medications with escalation to antireflux surgery as needed. Endoscopic therapy may represent a bridge between pharmacotherapy and surgery and represents an appropriate option for select individuals. RECENT FINDINGS Appropriate patient selection for endoscopic antireflux therapies is critical to the success of the intervention. Candidates for endoscopic treatment with trans-oral incisionless fundoplication (TIF) include those with a small (<2 cm) or no hiatal hernia and a Hill valve grade 1 or 2. Transoral incisionless fundoplication with concomitant hiatal hernia repair (cTIF) is a safe and effective option that addresses both the crural diaphragm and gastroesophageal flap valve (GEFV). SUMMARY Endoscopic interventions for GERD continue to evolve and are not all created equal. Given our current understanding of the mechanisms of GERD, the TIF procedure stands out in its ability to re-create the optimal GEFV. In those patients with altered anatomy, endoscopic approaches may offer at least partial benefit.
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Affiliation(s)
- Jennifer M Kolb
- Vatche and Tamar Manoukian Division of Digestive Diseases, David Geffen School of Medicine at UCLA, Greater Los Angeles VA, Los Angeles
| | - Kenneth J Chang
- Digestive Health Institute, University of California, Irvine, California, USA
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