1
|
Li Y, Wang L, Yang D, Zhang Z, Sun X, Geng X, Lin J, Duan Z. Esophageal chemical clearance and mucosa integrity values in refractory gastroesophageal reflux disease patients with different esophageal dynamics. Scand J Gastroenterol 2023; 58:322-330. [PMID: 36259257 DOI: 10.1080/00365521.2022.2132534] [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] [Indexed: 02/04/2023]
Abstract
OBJECTIVES Esophageal post-reflux swallow-induced peristaltic wave index (PSPWI) and mean nocturnal baseline impedance (MNBI), novel impedance-based markers of reflux burden, are associated with esophageal dynamics. We aim to investigate the characteristics of PSPWI and MNBI in Chinese refractory gastroesophageal reflux disease (RGERD) patients with different esophageal dynamic changes. MATERIALS AND METHODS 201 RGERD and 76 functional heartburn patients, undergone off-PPI endoscopy, esophageal manometry and impedance-pH monitoring, were included. Comparisons of conventional and novel impedance-pH metrics were made among different esophageal dynamics groups. Receiver operating-characteristic analyses were utilized to evaluate the diagnostic efficacy of PSPWI and MNBI in differentiating abnormal esophageal dynamics. Correlations were used to investigate their associated factors. RESULTS PSPWI and MNBI of RGERD with esophagogastric junction (EGJ) injury and esophageal dysmotility were lower than EGJ injury alone or normal dynamics (p < 0.05 for both comparisons). PSPWI with esophageal peristalsis abnormality was lower than EGJ injury (p = 0.049), while MNBI showed no statistical difference. PSPWI, MNBI and their combination have auxiliary diagnostic values for esophageal peristalsis [area under the curves (AUCs): 0.683, 0.656, 0.708)] while only their combination for EGJ injury (AUC: 0.610). And they positively correlated with esophageal motility while negatively correlated with ineffective swallows and acid reflux events. CONCLUSIONS PSPWI and MNBI, indicating impairment of esophageal chemical clearance and mucosa integrity, were lower in RGERD patients with multiple esophageal dynamic injuries than single injuries or normal dynamics. Moreover, they provided useful contributing information for potential dynamic injuries if manometry has already been found normal or marginal.
Collapse
Affiliation(s)
- Yanqiu Li
- Second Gastroenterology Department, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Lixia Wang
- Second Gastroenterology Department, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Dong Yang
- Second Gastroenterology Department, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Zhifeng Zhang
- Second Gastroenterology Department, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Xiaoyu Sun
- Second Gastroenterology Department, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Xiaoling Geng
- Second Gastroenterology Department, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Jiarong Lin
- Second Gastroenterology Department, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Zhijun Duan
- Second Gastroenterology Department, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| |
Collapse
|
2
|
Advancements in the use of 24-hour impedance-pH monitoring for GERD diagnosis. Curr Opin Pharmacol 2022; 65:102264. [DOI: 10.1016/j.coph.2022.102264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 05/01/2022] [Accepted: 06/06/2022] [Indexed: 11/23/2022]
|
3
|
Visaggi P, Mariani L, Svizzero FB, Tarducci L, Sostilio A, Frazzoni M, Tolone S, Penagini R, Frazzoni L, Ceccarelli L, Savarino V, Bellini M, Gyawali PC, Savarino EV, de Bortoli N. Clinical use of mean nocturnal baseline impedance and post-reflux swallow-induced peristaltic wave index for the diagnosis of gastro-esophageal reflux disease. Esophagus 2022; 19:525-534. [PMID: 35768671 PMCID: PMC9436885 DOI: 10.1007/s10388-022-00933-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 06/07/2022] [Indexed: 02/03/2023]
Abstract
The clinical diagnosis of gastro-esophageal reflux disease (GERD) is based on the presence of typical esophageal troublesome symptoms. In clinical practice, heartburn relief following a proton pump inhibitor (PPI) trial or endoscopy can confirm a diagnosis of GERD. In cases of diagnostic uncertainty or before anti-reflux interventions, combined impedance-pH monitoring (MII-pH) provides a comprehensive assessment of both physical and chemical properties of the refluxate, allowing to achieve a conclusive diagnosis of GERD. Recently, the Lyon Consensus proposed the use of mean nocturnal baseline impedance (MNBI) and post-reflux swallow-induced peristaltic wave index (PSPW-I) as novel MII-pH metrics to support the diagnosis of GERD. The calculation of MNBI and PSPW-I currently needs to be performed manually, but artificial intelligence systems for the automated analysis of MII-pH tracings are being developed. Several studies demonstrated the increased diagnostic yield MNBI and PSPW-I for the categorization of patients with GERD at both on- and off-PPI MII-pH monitoring. Accordingly, we performed a narrative review on the clinical use and diagnostic yield of MNBI and PSPW-I when the diagnosis of GERD is uncertain. Based on currently available evidence, we strongly support the evaluation of PSPW-I and MNBI as part of the standard assessment of MII-pH tracings for the evaluation of GERD, especially in patients with endoscopy-negative heartburn.
Collapse
Affiliation(s)
- Pierfrancesco Visaggi
- Division of Gastroenterology, Department of Translational Research and New Technologies in Medicine and Surgery, School of Medicine, University of Pisa, Pisa, Italy
| | - Lucia Mariani
- Division of Gastroenterology, Department of Translational Research and New Technologies in Medicine and Surgery, School of Medicine, University of Pisa, Pisa, Italy
| | - Federica Baiano Svizzero
- Division of Gastroenterology, Department of Translational Research and New Technologies in Medicine and Surgery, School of Medicine, University of Pisa, Pisa, Italy
| | - Luca Tarducci
- Division of Gastroenterology, Department of Translational Research and New Technologies in Medicine and Surgery, School of Medicine, University of Pisa, Pisa, Italy
| | - Andrea Sostilio
- Division of Gastroenterology, Department of Translational Research and New Technologies in Medicine and Surgery, School of Medicine, University of Pisa, Pisa, Italy
| | - Marzio Frazzoni
- Digestive Pathophysiology Unit, Baggiovara Hospital, Modena, Italy
| | - Salvatore Tolone
- General and Bariatric Surgery Unit, Department of Surgery, University of Caserta Luigi Vanvitelli, Caserta, Italy
| | - Roberto Penagini
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
- Gastroenterology and Endoscopy Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Leonardo Frazzoni
- Gastroenterology Unit, Department of Medical and Surgical Sciences, Sant'Orsola Hospital, University of Bologna, Bologna, Italy
| | - Linda Ceccarelli
- Division of Gastroenterology, Department of Translational Research and New Technologies in Medicine and Surgery, School of Medicine, University of Pisa, Pisa, Italy
| | - Vincenzo Savarino
- Gastroenterology Unit, Department of Internal Medicine "DiMI", University of Genoa, Genoa, Italy
| | - Massimo Bellini
- Division of Gastroenterology, Department of Translational Research and New Technologies in Medicine and Surgery, School of Medicine, University of Pisa, Pisa, Italy
| | - Prakash C Gyawali
- Division of Gastroenterology, Washington University School of Medicine, St. Louis, USA
| | - Edoardo V Savarino
- Division of Gastroenterology, Department of Surgical, Oncological and Gastroenterological Sciences, University of Padua, Padua, Italy
| | - Nicola de Bortoli
- Division of Gastroenterology, Department of Translational Research and New Technologies in Medicine and Surgery, School of Medicine, University of Pisa, Pisa, Italy.
| |
Collapse
|
4
|
Rogers B, Samanta S, Ghobadi K, Patel A, Savarino E, Roman S, Sifrim D, Gyawali CP. Artificial intelligence automates and augments baseline impedance measurements from pH-impedance studies in gastroesophageal reflux disease. J Gastroenterol 2021; 56:34-41. [PMID: 33151406 DOI: 10.1007/s00535-020-01743-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 10/19/2020] [Indexed: 02/04/2023]
Abstract
BACKGROUND Artificial intelligence (AI) has potential to streamline interpretation of pH-impedance studies. In this exploratory observational cohort study, we determined feasibility of automated AI extraction of baseline impedance (AIBI) and evaluated clinical value of novel AI metrics. METHODS pH-impedance data from a convenience sample of symptomatic patients studied off (n = 117, 53.1 ± 1.2 years, 66% F) and on (n = 93, 53.8 ± 1.3 years, 74% F) anti-secretory therapy and from asymptomatic volunteers (n = 115, 29.3 ± 0.8 years, 47% F) were uploaded into dedicated prototypical AI software designed to automatically extract AIBI. Acid exposure time (AET) and manually extracted mean nocturnal baseline impedance (MNBI) were compared to corresponding total, upright, and recumbent AIBI and upright:recumbent AIBI ratio. AI metrics were compared to AET and MNBI in predicting ≥ 50% symptom improvement in GERD patients. RESULTS Recumbent, but not upright AIBI, correlated with MNBI. Upright:recumbent AIBI ratio was higher when AET > 6% (median 1.18, IQR 1.0-1.5), compared to < 4% (0.95, IQR 0.84-1.1), 4-6% (0.89, IQR 0.72-0.98), and controls (0.93, IQR 0.80-1.09, p ≤ 0.04). While MNBI, total AIBI, and the AIBI ratio off PPI were significantly different between those with and without symptom improvement (p < 0.05 for each comparison), only AIBI ratio segregated management responders from other cohorts. On ROC analysis, off therapy AIBI ratio outperformed AET in predicting GERD symptom improvement when AET was > 6% (AUC 0.766 vs. 0.606) and 4-6% (AUC 0.563 vs. 0.516) and outperformed MNBI overall (AUC 0.661 vs. 0.313). CONCLUSIONS BI calculation can be automated using AI. Novel AI metrics show potential in predicting GERD treatment outcome.
Collapse
Affiliation(s)
- Benjamin Rogers
- Division of Gastroenterology, Washington University School of Medicine, 660 South Euclid Ave., Campus Box 8124, Saint Louis, MO, 63110, USA
| | | | | | - Amit Patel
- Division of Gastroenterology, Duke University School of Medicine, The Durham Veterans Affairs Medical Center, Durham, NC, USA
| | - Edoardo Savarino
- Division of Gastroenterology, Department of Surgery, Oncology and Gastroenterology, University of Padua, Padua, Italy
| | - Sabine Roman
- Digestive Physiology, Hospices Civils de Lyon, Hopital E Herriot, Université de Lyon, 69437, Lyon, France.,Digestive Physiology, Université de Lyon, Lyon I University, 69008, Lyon, France.,Université de Lyon, Inserm U1032, LabTAU, 69008, Lyon, France
| | - Daniel Sifrim
- Barts and The London School of Medicine and Dentistry Queen Mary, University of London, London, UK
| | - C Prakash Gyawali
- Division of Gastroenterology, Washington University School of Medicine, 660 South Euclid Ave., Campus Box 8124, Saint Louis, MO, 63110, USA.
| |
Collapse
|
5
|
Akiyama J, Sumida J, Nakagawa K, Masamune A, Issariyakulkarn N, Patcharatrakul T, Shetler K, Kuribayashi S, Uraoka T, Triadafilopoulos G. New developments in esophageal function testing and esophageal manifestations of connective tissue disorders. Ann N Y Acad Sci 2020; 1481:170-181. [DOI: 10.1111/nyas.14424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 05/25/2020] [Accepted: 06/09/2020] [Indexed: 12/31/2022]
Affiliation(s)
- Junichi Akiyama
- Division of Gastroenterology and Hepatology National Center for Global Health and Medicine Tokyo Japan
| | - Junko Sumida
- Division of Gastroenterology and Hepatology National Center for Global Health and Medicine Tokyo Japan
| | - Kenichiro Nakagawa
- Division of Gastroenterology Tohoku University Graduate School of Medicine Sendai Japan
| | - Atsushi Masamune
- Division of Gastroenterology Tohoku University Graduate School of Medicine Sendai Japan
| | - Navapan Issariyakulkarn
- Division of Gastroenterology King Chulalongkorn Memorial Hospital Thai Red Cross Society Bangkok Thailand
| | - Tanisa Patcharatrakul
- Division of Gastroenterology King Chulalongkorn Memorial Hospital Thai Red Cross Society Bangkok Thailand
- Center of Excellence in Neurogastroenterology and Motility, Department of Medicine, Faculty of Medicine Chulalongkorn University Bangkok Thailand
| | - Katerina Shetler
- Department of Gastroenterology Palo Alto Medical Foundation Mountain View California
| | - Shiko Kuribayashi
- Department of Gastroenterology and Hepatology Gunma University Graduate School of Medicine Maebashi Japan
| | - Toshio Uraoka
- Department of Gastroenterology and Hepatology Gunma University Graduate School of Medicine Maebashi Japan
| | - George Triadafilopoulos
- Division of Gastroenterology and Hepatology Stanford University School of Medicine Stanford California
| |
Collapse
|
6
|
Savarino E, Frazzoni M, Marabotto E, Zentilin P, Iovino P, Costantini M, Tolone S, Battaglia E, Cicala M, Usai-Satta P, de Bortoli N, Penagini R, Savarino V. A SIGE-SINGEM-AIGO technical review on the clinical use of esophageal reflux monitoring. Dig Liver Dis 2020; 52:966-980. [PMID: 32513632 DOI: 10.1016/j.dld.2020.04.031] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 04/28/2020] [Indexed: 02/07/2023]
Abstract
Patients with esophageal symptoms potentially associated with gastroesophageal reflux disease such as heartburn, regurgitation, chest pain, or cough represent one of the most frequent reasons for referral to gastroenterological evaluation. The utility of esophageal reflux monitoring in clinical practice is: (1) to accurately define reflux burden, (2) to segregate patients according to reflux monitoring results as true GERD, reflux hypersensitivity and functional heartburn, and (3) to establish a treatment plan. With this in mind, in the last decade, investigations and technical advances, with the introduction of impedance-pH monitoring and wireless pH capsule, have enhanced our understanding and management of GERD. The following recommendations were discussed and approved after a comprehensive review of the medical literature pertaining to reflux testing techniques and their recent application. This review created under the auspices of the Società Italiana di Gastroenterologia ed Endoscopia Digestiva (SIGE), Società Italiana di Neuro-Gastro-Enterologia e Motilità (SINGEM) and Associazione Italiana Gastroenterologi ed Endoscopisti Digestivi Ospedalieri (AIGO) is intended to help clinicians in applying reflux studies in the most fruitful manner within the context of their patients with esophageal symptoms.
Collapse
Affiliation(s)
- Edoardo Savarino
- Gastrointestinal Unit, Department of Surgery, Oncology and Gastroenterology, University of Padua, Padua, Italy.
| | - Marzio Frazzoni
- Digestive Pathophysiology Unit, Baggiovara Hospital, Modena, Italy
| | - Elisa Marabotto
- Gastrointestinal Unit, Department of Internal Medicine, University of Genoa, Genoa, Italy
| | - Patrizia Zentilin
- Gastrointestinal Unit, Department of Internal Medicine, University of Genoa, Genoa, Italy
| | - Paola Iovino
- Gastroenterology Unit, University of Salerno, Salerno, Italy
| | - Mario Costantini
- Clinica Chirurgica III, Department of Surgery, Oncology and Gastroenterology, University of Padua, Padua, Italy
| | | | - Edda Battaglia
- Gastroenterology and Endoscopy Unit, Cardinal Massaja Hospital, Asti, Italy
| | - Michele Cicala
- Unit of Digestive Diseases, Campus Bio Medico University, Rome, Italy
| | | | - Nicola de Bortoli
- Gastrointestinal Unit-Department of Translational Sciences and New Technologies in Medicine and Surgery, University of Pisa, 56124 Pisa, Italy
| | - Roberto Penagini
- Gastroenterology and Endoscopy Unit - Department of Pathophysiology and Transplantation, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico - University of Milan, Milan, Italy; Department of Pathophysiology and Transplantation, University of Milan, Italy
| | - Vincenzo Savarino
- Gastrointestinal Unit, Department of Internal Medicine, University of Genoa, Genoa, Italy
| |
Collapse
|
7
|
Hasak S, Brunt LM, Wang D, Gyawali CP. Reply. Clin Gastroenterol Hepatol 2020; 18:1646-1647. [PMID: 31927108 DOI: 10.1016/j.cgh.2020.01.002] [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: 12/30/2019] [Accepted: 01/07/2020] [Indexed: 02/07/2023]
Affiliation(s)
- Stephen Hasak
- Division of Gastroenterology, Washington University School of Medicine, Saint Louis, Missouri
| | - L Michael Brunt
- Division of Minimally Invasive Surgery, Washington University School of Medicine, Saint Louis, Missouri
| | - Dan Wang
- The First Hospital of Jilin University, Changchung, Jilin, China
| | - C Prakash Gyawali
- Division of Gastroenterology, Washington University School of Medicine, Saint Louis, Missouri
| |
Collapse
|
8
|
Savarino V, Marabotto E, Zentilin P, Furnari M, Bodini G, De Maria C, Tolone S, De Bortoli N, Frazzoni M, Savarino E. Pathophysiology, diagnosis, and pharmacological treatment of gastro-esophageal reflux disease. Expert Rev Clin Pharmacol 2020; 13:437-449. [PMID: 32253948 DOI: 10.1080/17512433.2020.1752664] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
INTRODUCTION Gastro-esophageal reflux disease (GERD) is a highly prevalent, chronic, relapsing disorder, whose knowledge has increased in last years thanks to the advent of new sophisticated techniques, such as 24-h impedance-pH monitoring and high-resolution manometry, for the study of esophageal functions. AREAS COVERED This review provides an overview of our advancements in understanding the complex pathophysiology, improving the diagnosis and defining the modern pharmacological therapeutic approach to GERD. EXPERT OPINION The growing clinical application of impedance-pH testing has allowed us to know the diversity of patients with non-erosive reflux disease (NERD), who nowadays represent about 70% of the whole population with reflux symptoms. We have realized that NERD has to be considered as an umbrella term covering various subgroups with different pathophysiologies. The development of new impedance metrics, in particular mean nocturnal baseline impedance, seems to be promising in the improvement of the diagnostic process of this disease. There are no particularly innovative features in the pharmacological therapy of GERD, unless the interest toward drugs is able to increase the defense properties of esophageal mucosa and/or its protection. These compounds can be of help in combination with proton pump inhibitors in NERD patients with partial response to antisecretory drugs alone.
Collapse
Affiliation(s)
| | - Elisa Marabotto
- Department of Internal Medicine, University of Genoa , Genoa, Italy
| | | | - Manuele Furnari
- Department of Internal Medicine, University of Genoa , Genoa, Italy
| | - Giorgia Bodini
- Department of Internal Medicine, University of Genoa , Genoa, Italy
| | | | - Salvatore Tolone
- Department of Surgery, University of Campania "Luigi Vanvitelli" , Naples, Italy
| | - Nicola De Bortoli
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa , Pisa, Italy
| | - Marzio Frazzoni
- Department of Gastroenterology, Gastroenterology Digestive Pathophysiology Unit, Baggiovara Hospital , Modena, Italy
| | - Edoardo Savarino
- Department of Surgery, Oncology and Gastroenterology, University of Padua , Padua, Italy
| |
Collapse
|
9
|
Ribolsi M, Gyawali CP, Savarino E, Rogers B, Rengarajan A, Della Coletta M, Ghisa M, Cicala M. Correlation between reflux burden, peristaltic function, and mucosal integrity in GERD patients. Neurogastroenterol Motil 2020; 32:e13752. [PMID: 31670453 DOI: 10.1111/nmo.13752] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 09/14/2019] [Accepted: 10/07/2019] [Indexed: 12/14/2022]
Abstract
BACKGROUND Mean nocturnal baseline impedance (MNBI) augments the diagnostic yield of multichannel intraluminal impedance-pH (MII-pH) monitoring. While acid exposure time (AET) correlates with MNBI, it remains unclear whether esophageal motility affects MNBI values. The present study was aimed at evaluating the respective roles of esophageal motor function and AET on MNBI. METHODS High-resolution manometry (HRM) studies and ambulatory 24-hour MII-pH monitoring tracings were retrospectively analyzed from consecutive endoscopy-negative GERD patients with typical symptoms responsive to previous acid-suppressive therapy from three tertiary care centers. Univariate and multivariate analyses were performed to determine predictors of pathologic MNBI values at 3 cm and 5 cm above the lower esophageal sphincter (LES). KEY RESULTS Patients with pathological AET displayed lower MNBI values at 3 cm and 5 cm (P < .01) compared to patients with non-pathological AET. Similarly, significantly lower MNBI values were also noted at both sites with type 3 EGJ compared to type 1 EGJ (P ≤ .02 for each comparison), and with absent contractility compared to normal peristalsis (P ≤ .02 for each comparison). On multivariate analysis, the presence of type 2 or 3 EGJ and absent contractility were associated with a significantly higher probability of pathological MNBI values at 3 cm and 5 cm above the LES. CONCLUSIONS AND INFERENCES Disruption of the EGJ and absent contractility on HRM are both associated with lower MNBI values. HRM findings complement reflux testing using MII-pH monitoring.
Collapse
Affiliation(s)
- Mentore Ribolsi
- Unit of Gastroenterology, Campus Bio Medico University, Rome, Italy
| | - Chandra Prakash Gyawali
- Department of Medicine, Division of Gastroenterology, Washington University School of Medicine, St. Louis, Missouri
| | - Edoardo Savarino
- Division of Gastroenterology, Department of Surgical, Oncological and Gastroenterological Sciences, University of Padua, Padua, Italy
| | - Benjamin Rogers
- Department of Medicine, Division of Gastroenterology, Washington University School of Medicine, St. Louis, Missouri
| | - Arvind Rengarajan
- Department of Medicine, Division of Gastroenterology, Washington University School of Medicine, St. Louis, Missouri
| | - Marco Della Coletta
- Division of Gastroenterology, Department of Surgical, Oncological and Gastroenterological Sciences, University of Padua, Padua, Italy
| | - Matteo Ghisa
- Division of Gastroenterology, Department of Surgical, Oncological and Gastroenterological Sciences, University of Padua, Padua, Italy
| | - Michele Cicala
- Unit of Gastroenterology, Campus Bio Medico University, Rome, Italy
| |
Collapse
|
10
|
Gyawali CP, Azagury DE, Chan WW, Chandramohan SM, Clarke JO, Bortoli N, Figueredo E, Fox M, Jodorkovsky D, Lazarescu A, Malfertheiner P, Martinek J, Murayama KM, Penagini R, Savarino E, Shetler KP, Stein E, Tatum RP, Wu J. Nonerosive reflux disease: clinical concepts. Ann N Y Acad Sci 2018; 1434:290-303. [DOI: 10.1111/nyas.13845] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 03/17/2018] [Accepted: 04/11/2018] [Indexed: 02/06/2023]
Affiliation(s)
- C. Prakash Gyawali
- Division of GastroenterologyWashington University School of Medicine St. Louis Missouri
| | - Dan E. Azagury
- Department of SurgeryStanford University Stanford California
| | - Walter W. Chan
- Division of Gastroenterology, Hepatology and EndoscopyBrigham and Women's Hospital Boston Massachusetts
| | | | - John O. Clarke
- Division of GastroenterologyStanford University Stanford California
| | - Nicola Bortoli
- Department of Translational ResearchUniversity of Pisa Pisa Italy
| | - Edgar Figueredo
- Department of SurgeryUniversity of Washington Seattle Washington
| | - Mark Fox
- Department of GastroenterologySt. Claraspital Basel Switzerland
| | - Daniela Jodorkovsky
- Division of Digestive and Liver DiseasesColumbia University Medical Center New York New York
| | - Adriana Lazarescu
- Division of GastroenterologyUniversity of Alberta Edmonton Alberta Canada
| | - Peter Malfertheiner
- Department of GastroenterologyOtto‐von‐Guericke Universität Magdeburg Germany
| | - Jan Martinek
- Department of HepatoGastroenterologyIKEM Prague Czech Republic
| | | | - Roberto Penagini
- Università degli Studi and Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milan Italy
| | - Edoardo Savarino
- Department of SurgicalOncological and Gastroenterological Sciences, University of Padua Padua Italy
| | - Katerina P. Shetler
- Gastroenterology DivisionPalo Alto Medical Foundation Mountain View California
| | - Ellen Stein
- Division of GastroenterologyJohns Hopkins University Baltimore Maryland
| | - Roger P. Tatum
- Department of SurgeryUniversity of Washington Seattle Washington
| | - Justin Wu
- Department of Medicine and TherapeuticsChinese University of Hong Kong Sha Tin Hong Kong
| |
Collapse
|
11
|
Savarino E, Zentilin P, Marabotto E, Pellegatta G, Coppo C, Brunacci M, Dulbecco P, Savarino V. Drugs for improving esophageal mucosa defense: where are we now and where are we going? Ann Gastroenterol 2017; 30:585-591. [PMID: 29118552 PMCID: PMC5670277 DOI: 10.20524/aog.2017.0187] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 07/24/2017] [Indexed: 12/12/2022] Open
Abstract
In the past, the attention of physiologists and doctors has been mainly focused on the key role of acid in the pathogenesis of gastroesophageal reflux disease (GERD), but increasing evidence that 20-40% of reflux patients respond not at all or only partially to proton pump inhibitors (PPIs) has underlined the concept that factors other than acid are implicated in its development and the elicitation of symptoms. Among these, impaired mucosal integrity, particularly in most patients with non-erosive reflux disease, has recently been reincluded and the reinforcement of defensive mechanisms and/or its protection has been reappointed as a renewed therapeutic target for the management of GERD patients. In this review we will summarize the existing knowledge of the old and novel compounds able to produce this therapeutic effect, including sucralfate, alginate-based drugs, and a new medical device consisting of hyaluronic acid and chondroitin sulfate dispersed in a bioadhesive carrier, together with the potential indications for their use. It is to be stressed, however, that, although these compounds may represent a real alternative to PPI therapy in GERD, the combination of mucosal protection with acid suppression may help manage many cases with a partial or unsatisfactory response to PPIs alone.
Collapse
Affiliation(s)
- Edoardo Savarino
- Gastrointestinal Unit, Department of Surgery, Oncology and Gastroenterology, University of Padua, Padua (Edoardo Savarino), Italy
| | - Patrizia Zentilin
- Gastrointestinal Unit, Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa (Patrizia Zentillin, Elisa Marabotto, Gaia Pellegatta, Claudia Coppo, Matteo Brunacci, Pietro Dulbecco, Vincenzo Savarino), Italy
| | - Elisa Marabotto
- Gastrointestinal Unit, Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa (Patrizia Zentillin, Elisa Marabotto, Gaia Pellegatta, Claudia Coppo, Matteo Brunacci, Pietro Dulbecco, Vincenzo Savarino), Italy
| | - Gaia Pellegatta
- Gastrointestinal Unit, Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa (Patrizia Zentillin, Elisa Marabotto, Gaia Pellegatta, Claudia Coppo, Matteo Brunacci, Pietro Dulbecco, Vincenzo Savarino), Italy
| | - Claudia Coppo
- Gastrointestinal Unit, Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa (Patrizia Zentillin, Elisa Marabotto, Gaia Pellegatta, Claudia Coppo, Matteo Brunacci, Pietro Dulbecco, Vincenzo Savarino), Italy
| | - Matteo Brunacci
- Gastrointestinal Unit, Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa (Patrizia Zentillin, Elisa Marabotto, Gaia Pellegatta, Claudia Coppo, Matteo Brunacci, Pietro Dulbecco, Vincenzo Savarino), Italy
| | - Pietro Dulbecco
- Gastrointestinal Unit, Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa (Patrizia Zentillin, Elisa Marabotto, Gaia Pellegatta, Claudia Coppo, Matteo Brunacci, Pietro Dulbecco, Vincenzo Savarino), Italy
| | - Vincenzo Savarino
- Gastrointestinal Unit, Department of Internal Medicine and Medical Specialties, University of Genoa, Genoa (Patrizia Zentillin, Elisa Marabotto, Gaia Pellegatta, Claudia Coppo, Matteo Brunacci, Pietro Dulbecco, Vincenzo Savarino), Italy
| |
Collapse
|
12
|
Frazzoni M, de Bortoli N, Frazzoni L, Tolone S, Savarino V, Savarino E. Impedance-pH Monitoring for Diagnosis of Reflux Disease: New Perspectives. Dig Dis Sci 2017; 62:1881-1889. [PMID: 28550489 DOI: 10.1007/s10620-017-4625-8] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Accepted: 05/19/2017] [Indexed: 12/17/2022]
Abstract
Heartburn is the most specific symptom of gastroesophageal reflux disease (GERD). In clinical practice, heartburn relief by a proton pump inhibitor (PPI) trial does suffice to confirm GERD. However, an objective diagnosis of GERD is required before anti-reflux endoscopic or surgical interventions, independently from PPI response. Thus, since normal findings at upper endoscopy are detected in the majority of patients with heartburn, reflux monitoring is often required. When traditional catheter-based or wireless pH tests are used, reflux episodes are conventionally identified by pH drops below 4.0 units. Combined impedance-pH monitoring has the advantage to provide a comprehensive assessment of both physical and chemical properties of refluxate and the distinction between acid and weakly acidic refluxes, both proven to cause heartburn. Unfortunately, the conventional impedance-pH parameters, namely acid exposure time and number of reflux events, are characterized by suboptimal diagnostic sensitivity, and the reliability of symptom-reflux association indexes remains questionable. Therefore, novel impedance parameters, namely the post-reflux swallow-induced peristaltic wave (PSPW) index and the mean nocturnal baseline impedance (MNBI), have recently been proposed in order to achieve a better diagnostic yield. In fact, they proved to be highly accurate in distinguishing reflux-related from reflux-unrelated heartburn, off- as well as on-PPI therapy. Currently, manual review of impedance-pH tracings is needed because of the modest accuracy of available software tools for automated analysis. PSPW index and MNBI are highly applicable and reproducible, and their calculation requires a few additional minutes during the manual review of impedance-pH tracings. So far, we believe that PSPW index and MNBI are ready for prime time and should become part of the standard analysis of impedance-pH tracings for GERD diagnosis in patients with endoscopy-negative heartburn.
Collapse
Affiliation(s)
- Marzio Frazzoni
- Digestive Pathophysiology Unit, Baggiovara Hospital, Viale Giardini 1355, 41100, Modena, Italy.
| | - Nicola de Bortoli
- Department of Translational Research and New Technology in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Leonardo Frazzoni
- Digestive Pathophysiology Unit, Baggiovara Hospital, Viale Giardini 1355, 41100, Modena, Italy.,Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Salvatore Tolone
- General and Bariatric Surgery Unit, Department of Surgery, 2nd University of Napoli, Naples, Italy
| | - Vincenzo Savarino
- Gastroenterology Unit, Department of Internal Medicine, University of Genova, Genoa, Italy
| | - Edoardo Savarino
- Gastroenterology Unit, Department of Surgery, Oncology and Gastroenterology, University of Padova, Padua, Italy
| |
Collapse
|
13
|
Frazzoni M, de Bortoli N, Frazzoni L, Furnari M, Martinucci I, Tolone S, Farioli A, Marchi S, Fuccio L, Savarino V, Savarino E. Impairment of chemical clearance and mucosal integrity distinguishes hypersensitive esophagus from functional heartburn. J Gastroenterol 2017; 52:444-451. [PMID: 27241210 DOI: 10.1007/s00535-016-1226-9] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 05/15/2016] [Indexed: 02/04/2023]
Abstract
BACKGROUND Hypersensitive esophagus (HE) is defined by endoscopy-negative heartburn with a normal acid exposure time but positive symptom association probability (SAP) and/or symptom index (SI) on impedance-pH monitoring, and proton pump inhibitor (PPI) responsiveness. Functional heartburn (FH) is distinguished by negative SAP/SI and PPI refractoriness. The clinical value of SAP and SI has been questioned. We aimed to investigate whether impairment of chemical clearance and of mucosal integrity, expressed by the postreflux swallow-induced peristaltic wave (PSPW) index and the mean nocturnal baseline impedance (MNBI), characterize HE independently of SAP and SI. METHODS Impedance-pH tracings from PPI-responsive endoscopy-negative patients, 125 with nonerosive reflux disease and 108 with HE, distinguished by an abnormal and a normal acid exposure time, and from 70 patients with FH were retrospectively selected and blindly reviewed. RESULTS The mean PSPW index and MNBI were significantly lower in nonerosive reflux disease (30 %, 1378 Ω) than in HE (51 %; 2274 Ω) and in both of them as compared with FH (76 %; 3445 Ω) (P = 0.0001). Both the PSPW index (adjusted odds ratio 0.863, P = 0.001) and the MNBI (adjusted odds ratio 0.998, P = 0.001) were independent predictors of HE; with their combined assessment, the area under the curve on receiver operating characteristic analysis was 0.957. SAP and/or SI was positive in 67 of the 108 HE patients (62 %), whereas the PSPW index and/or MNBI was abnormal in 99 of the 108 HE patients (92 %; P < 0.0001). CONCLUSIONS HE is characterized by impairment of chemical clearance and mucosal integrity, which explains the increased reflux perception. When SAP and SI afford uncertain results, the PSPW index and MNBI should be analyzed.
Collapse
Affiliation(s)
- Marzio Frazzoni
- Digestive Pathophysiology Unit, Baggiovara Hospital, Viale Giardini, 1355, 41100, Modena, Italy.
| | - Nicola de Bortoli
- Department of Translational Research and New Technology in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Leonardo Frazzoni
- Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Manuele Furnari
- Gastroenterology Unit, Department of Internal Medicine, University of Genoa, Genoa, Italy
| | - Irene Martinucci
- Department of Translational Research and New Technology in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Salvatore Tolone
- General and Bariatric Surgery Unit, Department of Surgery, 2nd University of Napoli, Naples, Italy
| | - Andrea Farioli
- Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Santino Marchi
- Department of Translational Research and New Technology in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Lorenzo Fuccio
- Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Vincenzo Savarino
- Gastroenterology Unit, Department of Internal Medicine, University of Genoa, Genoa, Italy
| | - Edoardo Savarino
- Gastroenterology Unit, Department of Surgery, Oncology and Gastroenterology, University of Padua, Padua, Italy
| |
Collapse
|
14
|
Frazzoni M, de Bortoli N, Frazzoni L, Tolone S, Furnari M, Martinucci I, Mirante VG, Marchi S, Savarino V, Savarino E. The added diagnostic value of postreflux swallow-induced peristaltic wave index and nocturnal baseline impedance in refractory reflux disease studied with on-therapy impedance-pH monitoring. Neurogastroenterol Motil 2017; 29. [PMID: 27620303 DOI: 10.1111/nmo.12947] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 08/23/2016] [Indexed: 12/29/2022]
Abstract
BACKGROUND On-therapy impedance-pH monitoring in proton pump inhibitor (PPI)-refractory gastroesophageal reflux disease (GERD) yielded conflicting results. We aimed to assess the diagnostic value of postreflux swallow-induced peristaltic wave (PSPW) index and mean nocturnal baseline impedance (MNBI) in PPI-refractory heartburn. METHODS On-therapy impedance-pH tracings from 189 consecutive patients with PPI-refractory heartburn were blindly reviewed. Patients were subdivided into refractory reflux esophagitis (RRE), healed reflux esophagitis (HRE), non-erosive reflux disease (NERD), and functional heartburn (FH) according to endoscopic and conventional impedance-pH findings. The diagnostic accuracy of PSPW index and MNBI in separating NERD from FH was assessed with receiver-operating-characteristic (ROC) analysis. Objectively documented persistent reflux remission at 3-year follow-up in 53 patients who underwent laparoscopic fundoplication served to evaluate PSPW index and MNBI as independent predictors of PPI-refractory GERD confirmed by positive surgical outcome. KEY RESULTS Median PSPW index and MNBI values were significantly lower in 39 RRE (16%; 1145 Ω) than in 41 HRE (25%; 1741 Ω) and in 68 NERD (29%; 2374 Ω) patients, and in all three GERD subgroups compared to 41 FH cases (67%; 3488 Ω) (P<.008). At ROC analysis, comparing NERD to FH the area under the curve was 0.886 with PSPW index and 0.677 with MNBI (P=.005). PSPW index was an independent predictor of PPI-refractory GERD (odds ratio 0.6983, P=.012). CONCLUSIONS & INFERENCES At on-therapy impedance-pH monitoring, PSPW index and MNBI efficiently distinguish PPI-refractory NERD from FH. The PSPW index represents an independent predictor of PPI-refractory GERD.
Collapse
Affiliation(s)
- M Frazzoni
- Digestive Pathophysiology Unit, Baggiovara Hospital, Modena, Italy
| | - N de Bortoli
- Department of Translational Research and New Technology in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - L Frazzoni
- Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - S Tolone
- General and Bariatric Surgery Unit, Department of Surgery, 2nd University of Napoli, Naples, Italy
| | - M Furnari
- Gastroenterology Unit, Department of Internal Medicine, University of Genova, Genova, Italy
| | - I Martinucci
- Department of Translational Research and New Technology in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - V G Mirante
- Digestive Pathophysiology Unit, Baggiovara Hospital, Modena, Italy
| | - S Marchi
- Department of Translational Research and New Technology in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - V Savarino
- Gastroenterology Unit, Department of Internal Medicine, University of Genova, Genova, Italy
| | - E Savarino
- Gastroenterology Unit, Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy
| |
Collapse
|
15
|
Patel A, Wang D, Sainani N, Sayuk GS, Gyawali CP. Distal mean nocturnal baseline impedance on pH-impedance monitoring predicts reflux burden and symptomatic outcome in gastro-oesophageal reflux disease. Aliment Pharmacol Ther 2016; 44:890-8. [PMID: 27554638 PMCID: PMC5026610 DOI: 10.1111/apt.13777] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 07/25/2016] [Accepted: 08/02/2016] [Indexed: 02/06/2023]
Abstract
BACKGROUND Mean nocturnal baseline impedance (MNBI), a novel pH-impedance metric, may be a surrogate marker of reflux burden. AIM To assess the predictive value of MNBI on symptomatic outcomes after anti-reflux therapy. METHODS In this prospective observational cohort study, pH-impedance studies performed over a 5-year period were reviewed. Baseline impedance was extracted from six channels at three stable nocturnal 10-min time periods, and averaged to yield MNBI. Distal and proximal oesophageal MNBI values were calculated by averaging MNBI values at 3, 5, 7 and 9 cm, and 15 and 17 cm respectively. Symptomatic outcomes were measured as changes in global symptom severity (GSS, rated on 100-mm visual analogue scales) on prospective follow-up after medical or surgical anti-reflux therapy. Univariate and multivariate analyses assessed the predictive value of MNBI on symptomatic outcomes. RESULTS Of 266 patients, 135 (50.8%) were tested off proton pump inhibitor (PPI) therapy and formed the study cohort (52.1 ± 1.1 years, 63.7% F). The 59 with elevated acid exposure time (AET) had lower composite and distal MNBI values than those with physiological AET (P < 0.0001), but similar proximal MNBI (P = 0.62). Linear AET negatively correlated with distal MNBI, both individually and collectively (Pearson's r = -0.5, P < 0.001), but not proximal MNBI (Pearson's r = 0, P = 0.72). After prospective follow-up (94 patients were followed up for 3.1 ± 0.2 years), univariate and multivariate regression models showed that distal MNBI, but not proximal MNBI, was independently predictive of linear GSS improvement. CONCLUSIONS Distal oesophageal MNBI negatively correlates with AET and, when assessed off PPI therapy, is independently predictive of symptomatic improvement following anti-reflux therapy.
Collapse
Affiliation(s)
- A Patel
- Division of Gastroenterology, Washington University School of Medicine, Saint Louis, MO, USA
| | - D Wang
- Division of Gastroenterology, Washington University School of Medicine, Saint Louis, MO, USA
| | - N Sainani
- Division of Gastroenterology, Washington University School of Medicine, Saint Louis, MO, USA
| | - G S Sayuk
- Division of Gastroenterology, Washington University School of Medicine, Saint Louis, MO, USA
| | - C P Gyawali
- Division of Gastroenterology, Washington University School of Medicine, Saint Louis, MO, USA.
| |
Collapse
|
16
|
Brock C, McCallum RW, Gyawali CP, Farmer AD, Frøkjaer JB, McMahon BP, Drewes AM. Neurophysiology and new techniques to assess esophageal sensory function: an update. Ann N Y Acad Sci 2016; 1380:78-90. [DOI: 10.1111/nyas.13175] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 06/10/2016] [Accepted: 06/15/2016] [Indexed: 12/19/2022]
Affiliation(s)
- Christina Brock
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital and Clinical Institute; Aalborg University; Aalborg Denmark
| | - Richard W. McCallum
- Department of Internal Medicine; Texas Tech University Health Sciences Center; El Paso Texas
| | - C. Prakash Gyawali
- Division of Gastroenterology; Washington University School of Medicine; St. Louis Missouri
| | - Adam D. Farmer
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital and Clinical Institute; Aalborg University; Aalborg Denmark
- Centre for Digestive Diseases, Blizard Institute, Wingate Institute of Neurogastroenterology, Barts and the London School of Medicine and Dentistry; Queen Mary University of London; London United Kingdom
- Department of Gastroenterology; University Hospitals of North Midlands; Stoke on Trent United Kingdom
| | - Jens Brøndum Frøkjaer
- Mech-Sense, Department of Radiology, Aalborg University Hospital and Clinical Institute; Aalborg University; Aalborg Denmark
| | - Barry P. McMahon
- Department of Medical Physics and Clinical Engineering; Tallaght Hospital and Trinity College; Dublin Ireland
| | - Asbjørn Mohr Drewes
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital and Clinical Institute; Aalborg University; Aalborg Denmark
| |
Collapse
|
17
|
de Bortoli N, Ottonello A, Zerbib F, Sifrim D, Gyawali CP, Savarino E. Between GERD and NERD: the relevance of weakly acidic reflux. Ann N Y Acad Sci 2016; 1380:218-229. [DOI: 10.1111/nyas.13169] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 06/04/2016] [Accepted: 06/13/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Nicola de Bortoli
- Division of Gastroenterology, Department of Translational Research and New Technology in Medicine and Surgery; University of Pisa; Pisa Italy
| | - Andrea Ottonello
- Division of Gastroenterology, Department of Surgery, Oncology and Gastroenterology; University of Padua; Padua Italy
| | - Frank Zerbib
- Department of Gastroenterology; CHU Bordeaux and Bordeaux University; Bordeaux France
| | - Daniel Sifrim
- Barts and the London School of Medicine and Dentistry; Queen Mary University of London; United Kingdom
| | - C. Prakash Gyawali
- Division of Gastroenterology; Washington University School of Medicine; St. Louis Missouri
| | - Edoardo Savarino
- Division of Gastroenterology, Department of Surgery, Oncology and Gastroenterology; University of Padua; Padua Italy
| |
Collapse
|