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Spada C, Piccirelli S, Hassan C, Ferrari C, Toth E, González-Suárez B, Keuchel M, McAlindon M, Finta Á, Rosztóczy A, Dray X, Salvi D, Riccioni ME, Benamouzig R, Chattree A, Humphries A, Saurin JC, Despott EJ, Murino A, Johansson GW, Giordano A, Baltes P, Sidhu R, Szalai M, Helle K, Nemeth A, Nowak T, Lin R, Costamagna G. AI-assisted capsule endoscopy reading in suspected small bowel bleeding: a multicentre prospective study. Lancet Digit Health 2024; 6:e345-e353. [PMID: 38670743 DOI: 10.1016/s2589-7500(24)00048-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 02/20/2024] [Accepted: 03/04/2024] [Indexed: 04/28/2024]
Abstract
BACKGROUND Capsule endoscopy reading is time consuming, and readers are required to maintain attention so as not to miss significant findings. Deep convolutional neural networks can recognise relevant findings, possibly exceeding human performances and reducing the reading time of capsule endoscopy. Our primary aim was to assess the non-inferiority of artificial intelligence (AI)-assisted reading versus standard reading for potentially small bowel bleeding lesions (high P2, moderate P1; Saurin classification) at per-patient analysis. The mean reading time in both reading modalities was evaluated among the secondary endpoints. METHODS Patients aged 18 years or older with suspected small bowel bleeding (with anaemia with or without melena or haematochezia, and negative bidirectional endoscopy) were prospectively enrolled at 14 European centres. Patients underwent small bowel capsule endoscopy with the Navicam SB system (Ankon, China), which is provided with a deep neural network-based AI system (ProScan) for automatic detection of lesions. Initial reading was performed in standard reading mode. Second blinded reading was performed with AI assistance (the AI operated a first-automated reading, and only AI-selected images were assessed by human readers). The primary endpoint was to assess the non-inferiority of AI-assisted reading versus standard reading in the detection (diagnostic yield) of potentially small bowel bleeding P1 and P2 lesions in a per-patient analysis. This study is registered with ClinicalTrials.gov, NCT04821349. FINDINGS From Feb 17, 2021 to Dec 29, 2021, 137 patients were prospectively enrolled. 133 patients were included in the final analysis (73 [55%] female, mean age 66·5 years [SD 14·4]; 112 [84%] completed capsule endoscopy). At per-patient analysis, the diagnostic yield of P1 and P2 lesions in AI-assisted reading (98 [73·7%] of 133 lesions) was non-inferior (p<0·0001) and superior (p=0·0213) to standard reading (82 [62·4%] of 133; 95% CI 3·6-19·0). Mean small bowel reading time was 33·7 min (SD 22·9) in standard reading and 3·8 min (3·3) in AI-assisted reading (p<0·0001). INTERPRETATION AI-assisted reading might provide more accurate and faster detection of clinically relevant small bowel bleeding lesions than standard reading. FUNDING ANKON Technologies, China and AnX Robotica, USA provided the NaviCam SB system.
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Affiliation(s)
- Cristiano Spada
- Department of Medicine, Gastroenterology and Endoscopy, Fondazione Poliambulanza Istituto Ospedaliero, Brescia, Italy; Università Cattolica del Sacro Cuore, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Stefania Piccirelli
- Department of Medicine, Gastroenterology and Endoscopy, Fondazione Poliambulanza Istituto Ospedaliero, Brescia, Italy; Università Cattolica del Sacro Cuore, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy.
| | - Cesare Hassan
- IRCCS Humanitas Research Hospital, Department of Biomedical Sciences, Rozzano, Milan, Italy
| | - Clarissa Ferrari
- Unit of Research and Clinical Trials, Fondazione Poliambulanza Istituto Ospedaliero, Brescia, Italy
| | - Ervin Toth
- Skåne University Hospital, Lund University, Department of Gastroenterology, Malmö, Sweden
| | - Begoña González-Suárez
- Hospital Clínic of Barcelona, Endoscopy Unit, Gastroenterology Department, Barcelona, Spain
| | - Martin Keuchel
- Agaplesion Bethesda Krankenhaus Bergedorf, Academic Teaching Hospital of the University of Hamburg, Clinic for Internal Medicine, Hamburg, Germany
| | - Marc McAlindon
- Sheffield Teaching Hospitals NHS Trust, Academic Department of Gastroenterology and Hepatology, Sheffield, UK; Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Ádám Finta
- Endo-Kapszula Health Centre and Endoscopy Unit, Department of Gastroenterology, Székesfehérvár, Hungary
| | - András Rosztóczy
- University of Szeged, Department of Internal Medicine, Szeged, Hungary
| | - Xavier Dray
- Sorbonne University, Saint Antoine Hospital, APHP, Centre for Digestive Endoscopy, Paris, France
| | - Daniele Salvi
- Department of Medicine, Gastroenterology and Endoscopy, Fondazione Poliambulanza Istituto Ospedaliero, Brescia, Italy; Università Cattolica del Sacro Cuore, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Maria Elena Riccioni
- Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Digestive Endoscopy Unit, Rome, Italy
| | - Robert Benamouzig
- Hôpital Avicenne, Université Paris 13, Service de Gastroenterologie, Bobigny, France
| | - Amit Chattree
- South Tyneside and Sunderland NHS Foundation Trust, Gastroenterology, Stockton-on-Tees, UK
| | - Adam Humphries
- St Mark's Hospital and Academic Institute, Department of Gastroenterology, Middlesex, UK
| | - Jean-Christophe Saurin
- Hospices Civils de Lyon-Centre Hospitalier Universitaire, Gastroenterology Department, Lyon, France
| | - Edward J Despott
- The Royal Free Hospital and University College London (UCL) Institute for Liver and Digestive Health, Royal Free Unit for Endoscopy, London, UK
| | - Alberto Murino
- The Royal Free Hospital and University College London (UCL) Institute for Liver and Digestive Health, Royal Free Unit for Endoscopy, London, UK
| | | | - Antonio Giordano
- Hospital Clínic of Barcelona, Endoscopy Unit, Gastroenterology Department, Barcelona, Spain
| | - Peter Baltes
- Agaplesion Bethesda Krankenhaus Bergedorf, Academic Teaching Hospital of the University of Hamburg, Clinic for Internal Medicine, Hamburg, Germany
| | - Reena Sidhu
- Sheffield Teaching Hospitals NHS Trust, Academic Department of Gastroenterology and Hepatology, Sheffield, UK; Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Milan Szalai
- Endo-Kapszula Health Centre and Endoscopy Unit, Department of Gastroenterology, Székesfehérvár, Hungary
| | - Krisztina Helle
- University of Szeged, Department of Internal Medicine, Szeged, Hungary
| | - Artur Nemeth
- Skåne University Hospital, Lund University, Department of Gastroenterology, Malmö, Sweden
| | | | - Rong Lin
- Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Department of Gastroenterology, Wuhan, China
| | - Guido Costamagna
- Department of Medicine, Gastroenterology and Endoscopy, Fondazione Poliambulanza Istituto Ospedaliero, Brescia, Italy; Università Cattolica del Sacro Cuore, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
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Ghoshal UC, Mishra P, Mathur A, Reddy SP, Fatima B, Misra A. Capsule endoscopy for obscure gastrointestinal bleed in the tropics: A single-center experience on 350 patients. Indian J Gastroenterol 2024:10.1007/s12664-024-01526-0. [PMID: 38517665 DOI: 10.1007/s12664-024-01526-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 01/03/2024] [Indexed: 03/24/2024]
Abstract
BACKGROUND Obscure gastrointestinal bleed (OGIB), now called small bowel bleed (SBB), comprises 5% to 10% of all gastrointestinal (GI) bleed episodes and capsule endoscopy (CE) is a tool for its evaluation. Studies on CE in a large sample of SBB patients from the tropics are limited. METHODS We did a retrospective analysis of a prospectively maintained database of patients with SBB undergoing CE using PillCam or MiroCam CE. RESULTS Of 350 patients (age 52.4 ± 17.4 years; 248 [70.9%] male) undergoing CE, 243 (69.4%) and 107 (30.6%) had overt and occult SBB, respectively. CE detected lesions in 244 (69.7%) patients (single lesion in 172 [49.1%]; multiple in 72 [20.6%]). The single lesions included vascular malformations (52, 14.9%), ulcer/erosion (47, 13.4%), tumor (24, 6.9%), hookworm (19, 5.4%), stricture (15, 4.3%), hemobilia (1, 0.3%) and blood without identifiable lesion (9, 2.6%). Of 72 with multiple lesions, ulcer with stricture was the commonest finding (n = 43, 12.3%). No abnormality was detected in 106 (30.3%) patients. The frequency of lesion detection was comparable among patients with overt and occult SBB (173/243, 71.2% vs. 71/107, 66.3%, respectively; p = 0.4). Younger patients (0 to 39 years) more often had multiple lesions on CE than the older (≥ 40 years) ones (26/76, 34.2% vs. 46/228, 20.2%, respectively; p = 0.001). CONCLUSION CE has a high diagnostic yield in SBB in the tropics, regardless of the type of bleed or of CE brand and the duration of recording. Multiple lesions associated with SBB are commoner among younger (< 40 years) patients.
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Affiliation(s)
- Uday C Ghoshal
- Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Raebareli Road, Lucknow, 226 014, India.
- Institute of Gastrosciences and Liver Transplantation, Apollo Multispeciality Hospitals, Kolkata, 700 054, India.
| | - Piyush Mishra
- Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Raebareli Road, Lucknow, 226 014, India
| | - Akash Mathur
- Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Raebareli Road, Lucknow, 226 014, India
| | - Sai Prathap Reddy
- Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Raebareli Road, Lucknow, 226 014, India
| | - Bushra Fatima
- Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Raebareli Road, Lucknow, 226 014, India
| | - Asha Misra
- Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Raebareli Road, Lucknow, 226 014, India
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Compare D, Sgamato C, Rocco A, Coccoli P, Donnarumma D, Marchitto SA, Cinque S, Palmieri P, Nardone G. The professional background of a referring physician predicts the diagnostic yield of small bowel capsule endoscopy in suspected small bowel bleeding. Endosc Int Open 2024; 12:E282-E290. [PMID: 38455125 PMCID: PMC10919998 DOI: 10.1055/a-2251-3285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 12/22/2023] [Indexed: 03/09/2024] Open
Abstract
Background and study aims The diagnostic yield of small-bowel capsule endoscopy (SBCE) in suspected small bowel bleeding (SSBB) is highly variable. Different reimbursement systems and equipment costs also limit SBCE use in clinical practice. Thus, minimizing non-diagnostic procedures is advisable. This study aimed to assess the SBCE diagnostic yield and identify factors predicting diagnostic findings in a cohort of patients with SSBB. Patients and methods In this retrospective cohort study, we analyzed the medical records of patients who consecutively underwent SBCE for SSBB over 9 years. By logistic regression, we identified covariates predicting diagnostic findings at SBCE. Finally, we performed a post-hoc cost analysis based on previous gastroenterologist or endoscopist consultations versus direct SBCE ordering by other specialists. Results The final analysis included 584 patients. Most SBCEs were ordered by a gastroenterologist or endoscopist (74%). The number of SBCEs without any finding was significantly lower in the gastroenterologist/endoscopist group P <0.001). The SBCE diagnostic yield ordered by a gastroenterologist or endoscopist was significantly higher than that by other specialists (63% vs 52%, odds ratio [OR] 1.57; 95% confidence interval [CI] 1.07-2.26, P =0.019). At multivariate analysis, older age (OR 1.7, 95%CI 1.2-2.4, P =0.005), anemia (OR 4.9, 95%CI 1.9-12, P =0.001), small bowel transit time (OR 1, 95%CI 1-1.02, P =0.039), and referring physician (OR 1.8, 95%CI 1.1-2.7, P =0.003) independently predicted diagnostic findings. Implementing prior gastroenterologist or endoscopist referral vs direct SBCE ordering would reduce medical expenditures by 16%. Conclusions The professional background of referring physicians significantly improves the diagnostic yield of SBCE and contributes to controlling public health costs.
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Affiliation(s)
- Debora Compare
- Gastroenterology Unit, Clinical Medicine and Surgery, University of Naples Federico II, Napoli, Italy
| | - Costantino Sgamato
- Gastroenterology Unit, Clinical Medicine and Surgery, University of Naples Federico II, Napoli, Italy
| | - Alba Rocco
- Gastroenterology Unit, Clinical Medicine and Surgery, University of Naples Federico II, Napoli, Italy
| | - Pietro Coccoli
- Gastroenterology Unit, Clinical Medicine and Surgery, University of Naples Federico II, Napoli, Italy
| | - Durante Donnarumma
- Gastroenterology Unit, Clinical Medicine and Surgery, University of Naples Federico II, Napoli, Italy
| | - Stefano Andrea Marchitto
- Gastroenterology Unit, Clinical Medicine and Surgery, University of Naples Federico II, Napoli, Italy
| | - Sofia Cinque
- Gastroenterology Unit, Clinical Medicine and Surgery, University of Naples Federico II, Napoli, Italy
| | - Pietro Palmieri
- Gastroenterology Unit, Clinical Medicine and Surgery, University of Naples Federico II, Napoli, Italy
| | - Gerardo Nardone
- Gastroenterology Unit, Clinical Medicine and Surgery, University of Naples Federico II, Napoli, Italy
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Aoki T, Yamada A, Oka S, Tsuboi M, Kurokawa K, Togo D, Tanino F, Teshima H, Saito H, Suzuki R, Arai J, Abe S, Kondo R, Yamashita A, Tsuboi A, Nakada A, Niikura R, Tsuji Y, Hayakawa Y, Matsuda T, Nakahori M, Tanaka S, Kato Y, Tada T, Fujishiro M. Comparison of clinical utility of deep learning-based systems for small-bowel capsule endoscopy reading. J Gastroenterol Hepatol 2024; 39:157-164. [PMID: 37830487 DOI: 10.1111/jgh.16369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 09/01/2023] [Accepted: 09/17/2023] [Indexed: 10/14/2023]
Abstract
BACKGROUND AND AIM Convolutional neural network (CNN) systems that automatically detect abnormalities from small-bowel capsule endoscopy (SBCE) images are still experimental, and no studies have directly compared the clinical usefulness of different systems. We compared endoscopist readings using an existing and a novel CNN system in a real-world SBCE setting. METHODS Thirty-six complete SBCE videos, including 43 abnormal lesions (18 mucosal breaks, 8 angioectasia, and 17 protruding lesions), were retrospectively prepared. Three reading processes were compared: (A) endoscopist readings without CNN screening, (B) endoscopist readings after an existing CNN screening, and (C) endoscopist readings after a novel CNN screening. RESULTS The mean number of small-bowel images was 14 747 per patient. Among these images, existing and novel CNN systems automatically captured 24.3% and 9.4% of the images, respectively. In this process, both systems extracted all 43 abnormal lesions. Next, we focused on the clinical usefulness. The detection rates of abnormalities by trainee endoscopists were not significantly different across the three processes: A, 77%; B, 67%; and C, 79%. The mean reading time of the trainees was the shortest during process C (10.1 min per patient), followed by processes B (23.1 min per patient) and A (33.6 min per patient). The mean psychological stress score while reading videos (scale, 1-5) was the lowest in process C (1.8) but was not significantly different between processes B (2.8) and A (3.2). CONCLUSIONS Our novel CNN system significantly reduced endoscopist reading time and psychological stress while maintaining the detectability of abnormalities. CNN performance directly affects clinical utility and should be carefully assessed.
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Affiliation(s)
- Tomonori Aoki
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
- Division of Next-Generation Endoscopic Computer Vision, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Atsuo Yamada
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Shiro Oka
- Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan
| | - Mayo Tsuboi
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Ken Kurokawa
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Daichi Togo
- Department of Gastroenterology, Sendai Kousei Hospital, Sendai, Japan
| | - Fumiaki Tanino
- Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan
| | - Hajime Teshima
- Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan
| | - Hiroaki Saito
- Department of Gastroenterology, Sendai Kousei Hospital, Sendai, Japan
| | - Ryuta Suzuki
- Department of Gastroenterology, Sendai Kousei Hospital, Sendai, Japan
| | - Junya Arai
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Sohei Abe
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Ryo Kondo
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Aya Yamashita
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Akiyoshi Tsuboi
- Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan
| | - Ayako Nakada
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Ryota Niikura
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
- Department of Gastroenterological Endoscopy, Tokyo Medical University, Tokyo, Japan
| | - Yosuke Tsuji
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
- Division of Next-Generation Endoscopic Computer Vision, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Yoku Hayakawa
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Tomoki Matsuda
- Department of Gastroenterology, Sendai Kousei Hospital, Sendai, Japan
| | - Masato Nakahori
- Department of Gastroenterology, Sendai Kousei Hospital, Sendai, Japan
| | - Shinji Tanaka
- Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan
| | | | - Tomohiro Tada
- AI Medical Service Inc, Tokyo, Japan
- Department of Surgical Oncology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
- Tada Tomohiro Institute of Gastroenterology and Proctology, Saitama, Japan
| | - Mitsuhiro Fujishiro
- Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
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Sciberras N, Zammit SC, Ellul P. Management of small bowel angioectasias diagnosed during video capsule endoscopy. Ann Gastroenterol 2023; 36:103-113. [PMID: 36864941 PMCID: PMC9932861 DOI: 10.20524/aog.2023.0780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 11/24/2022] [Indexed: 02/05/2023] Open
Abstract
Small bowel angioectasias (SBA) are vascular malformations consisting of thin-walled, dilated capillaries located in the gastrointestinal mucosa. They are responsible for 10% of all causes of gastrointestinal bleeding and 60% of small bowel bleeding pathologies. The diagnosis and management of SBA depend upon bleeding acuity, patient stability and patient characteristics. Small bowel capsule endoscopy is a relatively noninvasive diagnostic approach ideal for non-obstructed and hemodynamically stable patients. It is superior to computed tomography scans in visualizing mucosal lesions, such as angioectasias, as it provides mucosal views. Management of these lesions will depend on the patient's clinical condition and associated comorbidities, and very often consists of medical and/or endoscopic treatment delivered through small bowel enteroscopy.
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Affiliation(s)
- Nicole Sciberras
- Division of Gastroenterology, Department of Medicine, Mater Dei Hospital, Malta (Nicole Sciberras, Stefania Chetcuti Zammit, Pierre Ellul)
| | - Stefania Chetcuti Zammit
- Division of Gastroenterology, Department of Medicine, Mater Dei Hospital, Malta (Nicole Sciberras, Stefania Chetcuti Zammit, Pierre Ellul)
| | - Pierre Ellul
- Division of Gastroenterology, Department of Medicine, Mater Dei Hospital, Malta (Nicole Sciberras, Stefania Chetcuti Zammit, Pierre Ellul)
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Mohan N, Jarrett S, Pop A, Rodriguez D, Dudnick R. Effect of small bowel transit time on accuracy of video capsule endoscopy in evaluating suspected small bowel bleeding. World J Gastrointest Pharmacol Ther 2022; 13:88-95. [PMID: 36405301 PMCID: PMC9669782 DOI: 10.4292/wjgpt.v13.i6.88] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 08/02/2022] [Accepted: 09/21/2022] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Obscure small bowel bleeding is defined as gastrointestinal bleeding (GIB) that is unidentifiable with esophagogastroduodenoscopy and a colonoscopy with video capsule endoscopy (VCE) being the next gold standard step for evaluation. Small bowel transit time (SBTT) is a metric of a VCE study that is defined as the time the capsule takes to travel through the small intestine.
AIM To determine if SBTT within the VCE study, correlates to overall detection of obscure small bowel bleeds. Furthermore, we attempted to identify any existing correlation between SBTT and re-bleeding after a negative VCE study.
METHODS This is a single center retrospective analysis of VCE studies performed for overt and occult GIB at Einstein Medical Center, Philadelphia, between 2015 and 2019. Inclusion criteria primarily consisted of patients 18 years or older who had a VCE study done as part of the workup for a GIB. Patients with incomplete VCEs, poor preparation, or with less than 6 mo of follow up were excluded. A re-bleeding event was defined either as overt or occult within a 6-mo timeframe. Overt re-bleeding was defined as Visible melena or hematochezia with > 2 gm/dL drop in hemoglobin defined an overt re-bleeding event; whereas an unexplained > 2 gm/dL drop in hemoglobin with no visible bleeding defined an occult re-bleed.
RESULTS Results indicated that there was a significant and positive point biserial correlation between SBTT of 220 min and detection of a bleeding focus with a statistically significant p value of 0.008. However, the area under the curve was negligible when trying to identify a threshold time for SBTT to discriminate between risk of re-bleeding events after a negative VCE.
CONCLUSION In terms of SBTT and association with accuracy of VCE finding a bleeding focus, 220 min was found to be adequate transit time to accurately find a bleeding focus, when present. It was found that no threshold SBTT could be identified to help predict re-bleeding after a negative VCE.
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Affiliation(s)
- Nandakumar Mohan
- Internal Medicine, Einstein Medical Center Philadelphia, Philadelphia, PA 19141, United States
| | - Simone Jarrett
- Internal Medicine, Einstein Medical Center Philadelphia, Philadelphia, PA 19141, United States
| | - Alexander Pop
- Division of Gastrointestinal Diseases and Hepatology, Einstein Medical Center Philadelphia, Philadelphia, PA 19141, United States
| | - Daniel Rodriguez
- Department of Urban Health and Nutrition, Lasalle University, Philadelphia, PA 19141, United States
| | - Robert Dudnick
- Division of Gastrointestinal Diseases and Hepatology, Einstein Medical Center Philadelphia, Philadelphia, PA 19141, United States
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Xu H, Chen Y, Wang M, Zhu S. Clinical features of capsule endoscopy in young adults: A single‐center retrospective study. JGH Open 2022; 6:637-642. [PMID: 36091324 PMCID: PMC9446405 DOI: 10.1002/jgh3.12801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 07/04/2022] [Accepted: 07/17/2022] [Indexed: 11/09/2022]
Abstract
Background and Aim Capsule endoscopy (CE) has been used in clinical examination among people of various ages, while few studies exclusively focused on the young. We aimed to explore its clinical features in young adults and those with obscure gastrointestinal bleeding (OGIB). Methods A total of 479 young adults aged 18–44 years were analyzed, with median age of 33 years. Primary positive findings of patients were classified into four kinds of lesions, and potential risk of bleeding among patients with OGIB was assessed based on Saurin classification (P0‐2 lesions). Results The overall completion rate and diagnostic yield of CE among young adults were 89.77 and 77.04%, respectively. Significant differences were found among overall completion rate/diagnostic yield and inpatient status/CE brand. Positive diagnostic yield among 157 patients with OGIB was 51.59% (P1‐2 lesions), and the significant risk of bleeding was 37.04% (P2 lesions). Among patients with OGIB in which 134 patients with a total of 216 lesions, ulceration was the commonest P2 lesions, followed by angioectasia and telangiectasia. Inpatient rate, completion rate, and diagnostic yield were higher among patients with overt OGIB, and disease categories of overt OGIB were different compared with occult OGIB. Conclusion CE is an optimal tool for discovering lesions in young adults and could play a role in evaluating the bleeding risk of young adults with OGIB.
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Affiliation(s)
- Hui‐Wen Xu
- Department of Gastroenterology and Hepatology, The First Affiliated Hospital Sun Yat‐sen University Guangzhou China
| | - Yi‐Ru Chen
- Department of Gastroenterology and Hepatology, The First Affiliated Hospital Sun Yat‐sen University Guangzhou China
| | - Mei‐Qian Wang
- Department of Gastroenterology and Hepatology, The First Affiliated Hospital Sun Yat‐sen University Guangzhou China
| | - Sen‐Lin Zhu
- Department of Gastroenterology and Hepatology, The First Affiliated Hospital Sun Yat‐sen University Guangzhou China
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Abstract
Background Capsule endoscopy (CE) provides a novel approach to evaluate obscure gastrointestinal bleeding. Yet CE is not routinely utilized in the inpatient setting for a variety of reasons. We sought to identify factors that predict complete CE and diagnostically meaningful CE, as well as assess the impact of inpatient CE on further hospital management.1 na d2 Methods We conducted a retrospective review of patients undergoing inpatient CE at a tertiary referral, academic center over a 3 year period. We analyzed data on patient demographics, medical history, endoscopic procedures, hospital course, and results of CE. The primary outcome was complete CE and the secondary outcome was positive findings of pathology on CE. Results 131 patients were included (56.5% were men 43.5% women, median age of 71.0 years). Overall, CE was complete in 77.1% of patients. Complete CE was not related to motility risk factors, gender, or administration modality. Patients with incomplete CE tended to be older, have lower BMI, and Caucasian, however results did not reach statistical significance (p = 0.06; p = 0.06; p = 0.08 respectively). Positive CE was noted in 73.3% of patients, with 35.1% of all patients having active bleeding. Positive CE was not associated with AVM risk factors or medication use. 28.0% of patients underwent subsequent hospital procedures, among which 67.6% identified the same pathology seen on CE. Conclusions Contrary to previous studies, we found the majority of inpatient CEs were complete and positive for pathology. We found high rates of correlation between CE and subsequent procedures. The use of CE in the inpatient setting helps to guide the diagnosis and treatment of hospitalized patients with obscure gastrointestinal bleeding.
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Affiliation(s)
- Irving Levine
- Division of Gastroenterology, Department of Medicine, Northwell Health, New York, NY, USA.
| | - Soonwook Hong
- Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - Dimpal Bhakta
- Division of Gastroenterology, Hepatology and Nutrition, UTHealth McGovern Medical School, Houston, USA
| | - Matthew B McNeill
- Division of Gastroenterology and Hepatology, New York University Langone Health, New York, NY, USA
| | - Seth A Gross
- Division of Gastroenterology and Hepatology, New York University Langone Health, New York, NY, USA
| | - Melissa Latorre
- Division of Gastroenterology and Hepatology, New York University Langone Health, New York, NY, USA
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Snook J, Bhala N, Beales ILP, Cannings D, Kightley C, Logan RP, Pritchard DM, Sidhu R, Surgenor S, Thomas W, Verma AM, Goddard AF. British Society of Gastroenterology guidelines for the management of iron deficiency anaemia in adults. Gut 2021; 70:2030-2051. [PMID: 34497146 PMCID: PMC8515119 DOI: 10.1136/gutjnl-2021-325210] [Citation(s) in RCA: 83] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 07/26/2021] [Indexed: 12/12/2022]
Abstract
Iron deficiency anaemia (IDA) is a major cause of morbidity and burden of disease worldwide. It can generally be diagnosed by blood testing and remedied by iron replacement therapy (IRT) using the oral or intravenous route. The many causes of iron deficiency include poor dietary intake and malabsorption of dietary iron, as well as a number of significant gastrointestinal (GI) pathologies. Because blood is iron-rich it can result from chronic blood loss, and this is a common mechanism underlying the development of IDA-for example, as a consequence of menstrual or GI blood loss.Approximately a third of men and postmenopausal women presenting with IDA have an underlying pathological abnormality, most commonly in the GI tract. Therefore optimal management of IDA requires IRT in combination with appropriate investigation to establish the underlying cause. Unexplained IDA in all at-risk individuals is an accepted indication for fast-track secondary care referral in the UK because GI malignancies can present in this way, often in the absence of specific symptoms. Bidirectional GI endoscopy is the standard diagnostic approach to examination of the upper and lower GI tract, though radiological scanning is an alternative in some situations for assessing the large bowel. In recurrent or refractory IDA, wireless capsule endoscopy plays an important role in assessment of the small bowel.IDA may present in primary care or across a range of specialties in secondary care, and because of this and the insidious nature of the condition it has not always been optimally managed despite the considerable burden of disease- with investigation sometimes being inappropriate, incorrectly timed or incomplete, and the role of IRT for symptom relief neglected. It is therefore important that contemporary guidelines for the management of IDA are available to all clinicians. This document is a revision of previous British Society of Gastroenterology guidelines, updated in the light of subsequent evidence and developments.
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Affiliation(s)
- Jonathon Snook
- Gastroenterology, University Hospitals Dorset NHS Foundation Trust, Poole, UK
| | - Neeraj Bhala
- Gastroenterology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust and Institute of Applied Health Research, University of Birmingham, Birmingham, UK
| | - Ian L P Beales
- Gastroenterology, University of East Anglia, Norwich, UK
| | - David Cannings
- Gastroenterology, University Hospitals Dorset NHS Foundation Trust, Poole, UK
| | - Chris Kightley
- Digestive Diseases, Kettering General Hospital NHS Foundation Trust, Kettering, UK
| | | | - D Mark Pritchard
- Institute of Systems, Molecular and Integrative Biology, University of Liverpool and Department of Gastroenterology, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK
| | - Reena Sidhu
- Gastroenterology, Royal Hallamshire Hospital, Sheffield, UK
| | - Sue Surgenor
- Gastroenterology, University Hospitals Dorset NHS Foundation Trust, Poole, UK
| | - Wayne Thomas
- Haematology, Plymouth Hospitals NHS Foundation Trust, Plymouth, Plymouth, UK
| | - Ajay M Verma
- Digestive Diseases, Kettering General Hospital NHS Foundation Trust, Kettering, UK
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Westrich D, Hachem C, Boumitri C. Iron Deficiency and the Small bowel. Curr Gastroenterol Rep 2021; 23:12. [PMID: 34236539 DOI: 10.1007/s11894-021-00812-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/25/2021] [Indexed: 11/25/2022]
Abstract
PURPOSE OF REVIEW This article reviews iron deficiency anemia (IDA) and suspected small bowel bleeding (SSBB) from initial consultation through laboratory evaluation, endoscopic evaluation, and therapeutic options. RECENT FINDINGS Recent guidelines on management of SSBB, IDA, video capsule endoscopy (VCE), and device-assisted enteroscopy (DAE) are reviewed. The advantages and limitations of VCE, DAE, and imaging are discussed. Medical treatment for refractory small bowel bleeding is discussed. Evaluation of IDA starts with a detailed history and physical exam. Additional lab work can establish the diagnosis of IDA and evaluate for associated conditions. If initial endoscopic tests are unrevealing, SSBB should be ruled out. Further investigation can be performed using video capsule endoscopy (VCE), device-assisted enteroscopy (DAE), and imaging. The mainstay of medical treatment of IDA secondary to SSBB is iron supplementation. Additional treatment is tailored to the pathology and may include medical, endoscopic and surgical options.
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Affiliation(s)
- David Westrich
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Saint Louis University School of Medicine, 1402 South Grand Blvd, St. Louis, MO, 63104, USA
| | - Christine Hachem
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Saint Louis University School of Medicine, 1402 South Grand Blvd, St. Louis, MO, 63104, USA
| | - Christine Boumitri
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Saint Louis University School of Medicine, 1402 South Grand Blvd, St. Louis, MO, 63104, USA.
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Abstract
PURPOSE OF REVIEW Upper gastrointestinal (GI) bleeding is a significant cause of morbidity and mortality in the geriatric (age > 65 years) population and presents a unique management challenge in the context of multiple medical comorbidities, polypharmacy, and increased risk of adverse outcomes and is confounded by an increased prevalence of obscure GI bleeds. A review of relevant guidelines, literature, and personal observations will enhance management strategies in the elderly. RECENT FINDINGS Non-variceal bleeding represents a significant proportion of upper GI bleeding (UGIB) in geriatric patients. Peptic ulcer disease (PUD) remains the most common cause in geriatric patients hospitalized for UGIB, but its incidence is decreasing. Esophagogastroduodenoscopy (EGD) is the gold standard for treating UGIB in geriatrics with a therapeutic yield of approximately 75%. Scoring systems such as Glasgow-Blatchford (GBS) and AIMS-65 may be useful for risk stratification but are not validated in trials. Obscure bleeds account for up to 30% of hospitalizations and must be considered during triage and management. Video capsule endoscopy (VCE) technology is efficacious for detecting obscure jejunal bleeding after failed EGD and may enhance the yield of balloon-assisted enteroscopy (BAE). The most significant factor for the increased morbidity and mortality in the geriatric population is the presence of multiple medical comorbidities and polypharmacy. An EGD should be done within 24 h of hospital presentation. If non-diagnostic, VCE may be a viable option for diagnosing an obscure small-bowel bleed, representing up to 30% of GI bleeds in this population.
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Affiliation(s)
- Eugene Stolow
- Department of Internal Medicine, Long School of Medicine, UT Health San Antonio, San Antonio, TX, 78229-3900, USA
| | - Chris Moreau
- Department of Medicine, Division of Gastroenterology & Nutrition, Long School of Medicine, UT Health San Antonio, San Antonio, TX, 78229-3900, USA
| | - Hari Sayana
- Department of Medicine, Division of Gastroenterology & Nutrition, Long School of Medicine, UT Health San Antonio, San Antonio, TX, 78229-3900, USA
| | - Sandeep Patel
- Department of Medicine, Division of Gastroenterology & Nutrition, Long School of Medicine, UT Health San Antonio, San Antonio, TX, 78229-3900, USA.
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Abstract
BACKGROUND The complete examination rate of video capsule endoscopy can be increased by reduced gastric transit time (GTT) and or small bowel transit time (SBTT). This study aims to examine whether the prokinetic domperidone reduces GTT and/or SBTT in pediatric patients undergoing video capsule endoscopy (VCE). METHODS We performed a single-center randomized controlled trial (n=200) to evaluate the effect of domperidone on GTT and SBTT among pediatric patients in a tertiary university-affiliated hospital for children. We explored whether patients randomized to domperidone had increased GTT, SBTT (primary outcomes) or higher complete examination rate (secondary outcome). The safety outcomes were the adverse effects in the domperidone group. This study was registered on ClinicalTrials.gov (NCT03662113). RESULTS Demographic features including gender and age were similar between the 100 patients of the domperidone group and the 100 patients of the control group. The median GTT was 67.5 minutes (44.8-117.5) in the domperidone group and 80.0 minutes (42.0-128.0) in the control group, while the median SBTT was 317 minutes (231-436) and 323 minutes (225-426), respectively. There were no significant differences in GTT (P=0.49) and SBTT (P=0.52) between the two groups. The complete examination rate was 97% and 98% in the domperidone and control groups, respectively (P=1.00). CONCLUSIONS Domperidone shows no effect on GTT, SBTT and complete examination rate in pediatric patients receiving VCE.
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Affiliation(s)
- Jie Wu
- Department of Gastroenterology, Children's Hospital of Fudan University, Shanghai, China
| | - Ziqing Ye
- Department of Gastroenterology, Children's Hospital of Fudan University, Shanghai, China
| | - Aijuan Xue
- Department of Gastroenterology, Children's Hospital of Fudan University, Shanghai, China
| | - Ying Huang
- Department of Gastroenterology, Children's Hospital of Fudan University, Shanghai, China
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Arieira C, Dias de Castro F, Boal Carvalho P, Rosa B, Moreira MJ, Cotter J. Small-bowel transit time in capsule endoscopy: a determinant factor for the diagnosis of small-bowel bleeding. Rev Esp Enferm Dig 2021; 113:709-713. [PMID: 33486962 DOI: 10.17235/reed.2021.7487/2020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND small-bowel capsule endoscopy (SBCE) is the gold standard for the study of small-bowel bleeding (SBB). Recent studies suggest that longer small-bowel transit times (SBTT) may be associated with a higher diagnostic yield of SBCE. AIM the aim of the study was to investigate if longer SBTT is a predictive factor of positive findings on SBCE in a population that underwent SBCE for suspected SBB. METHODS a retrospective single-center study including consecutive SBCEs between May 2012 and May 2019, due to suspected SBB. A positive SBCE was considered in the presence of lesions with high bleeding potential such as ulcers, angioectasias, and tumors (P2 lesions, according to the Saurin classification). RESULTS we included 372 patients, 65.9 % female, with a median age of 67 (IQR: 19-97) years. We observed that patients with P2 lesions (n = 131; 35.2 %) in SBCE exhibited a longer SBTT (p = 0.01), were older (p < 0.001), were more frequently male (p = 0.019), and suffered more frequently from arterial blood hypertension (p = 0.011), diabetes (p = 0.042), chronic kidney disease (p = 0.003), and heart failure (p = 0.001). In the logistic analysis, significant predictive factors for the presence of P2 lesions included age (OR: 1.027; 95 % CI: 1.009-1.045; p = 0.004), SBTT (OR: 1.002; 95 % CI: 1.001-1.005; p = 0.029), and male gender (OR: 1.588; 95 % CI: 1.001-2.534; p = 0.049). CONCLUSIONS patients with longer SBTT had higher rates of lesions with high bleeding potential (P2). SBTT along with previously well-defined factors such as age and male gender were the only independent predictive factors for the presence of P2 lesions. These findings may suggest that a slower passage of the capsule through the small bowel may allow a better diagnostic yield for significant lesions.
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Affiliation(s)
- Cátia Arieira
- Gastrenterology, Hospital da Senhora da Oliveira, Portugal
| | | | | | - Bruno Rosa
- Gastroenterology, Hospital Senhora da Oliveira, Portugal
| | | | - José Cotter
- Gastroenterology, Hospital da Senhora da Oliveira, Portugal
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Blanco Velasco G, Pérez Rodríguez M, Álvarez Licona NE. Small bowel transit time of capsule endoscopy as a factor for the detection of lesions in potential small bowel bleeding. Rev Esp Enferm Dig 2019; 111:696-698. [PMID: 31333041 DOI: 10.17235/reed.2019.5943/2018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
BACKGROUND the relationship between small bowel transit time (SBTT) of the capsule endoscopy (CE) and the diagnosis of small bowel bleeding (SBB) is controversial. OBJECTIVE to evaluate the relationship between SBTT and CE and the identification of SBB. MATERIAL AND METHODS CE was divided according to SBTT into < 4 hours and ≥ 4 hours. RESULTS CE with SBTT ≥ 4 hours identified more angioectasias (p = 0.023), single lesions (p = 0.029) and jejunal lesions (p = 0.001) with an OR of 3.13 (95% CI, 1.61-6.10, p = 0.001) to identify the cause of SBB. CONCLUSIONS CE SBTT of ≥ 4 hours increases the diagnosis of SBB.
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Luo YY, Pan J, Chen YZ, Jiang X, Zou WB, Qian YY, Zhou W, Liu X, Li ZS, Liao Z. Magnetic Steering of Capsule Endoscopy Improves Small Bowel Capsule Endoscopy Completion Rate. Dig Dis Sci 2019; 64:1908-15. [PMID: 30725289 DOI: 10.1007/s10620-019-5479-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 01/17/2019] [Indexed: 12/17/2022]
Abstract
BACKGROUND Capsule endoscopy is currently available as a noninvasive and effective diagnostic modality to identify small bowel abnormalities, with a completion rate to the cecum between 75.1 and 95.6%. A novel magnetically controlled capsule endoscopy (MCE) system could facilitate passage of the capsule through the pylorus, thereby reducing the gastric transit time (GTT). OBJECTIVE We performed this study to determine whether magnetic steering could improve the capsule endoscopy completion rate (CECR) compared to standard protocol. METHODS Patients referred for MCE in our center from June 2017 to November 2017 were prospectively enrolled. Magnetic steering of the capsule through the pylorus was performed after standard gastric examination. CECR, GTT, pyloric transit time (PTT), and rapid gastric transit (GTT ≤ 30 min) rate were compared with a historical control group enrolled from January 2017 to May 2017. RESULTS CECR was significantly higher in the intervention group (n = 107) than control group (n = 120) (100% vs. 94.2%, P = 0.02), with a significantly shorter GTT (22.2 vs. 84.5 min, P < 0.001) and PTT (4.4 vs. 56.7 min, P < 0.001). Rapid gastric transit rate in the intervention group was significantly higher than the control group (58.9% vs. 15.0%, P < 0.001). There were no statistical differences in the diagnostic yields between the two groups. CONCLUSIONS Magnetic steering of capsule endoscopy improves small bowel CECR by reducing GTT, adding further support to MCE as a practical tool for noninvasive examination of both the stomach and small bowel. Trial registration ClinicalTrials.gov, ID: NCT03482661.
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Abstract
PURPOSE OF REVIEW The objective is to provide an overview on the cause of small bowel bleeding. We discuss the role of small bowel endoscopy in the management of small bowel bleeding and provide an outline of pharmacotherapy that can be additionally beneficial. RECENT FINDINGS Small bowel capsule endoscopy (SBCE) is the initial diagnostic investigation of choice in small bowel bleeding. Computed tomography (CT) can be helpful in the context of small bowel tumours. Device-assisted enteroscopy (DAE) enables several therapeutic procedures such as argon plasma coagulation (APC) and haemoclip application. It can also guide further management with histology or by marking culprit lesions with India ink. A persistent rate of rebleeding despite APC is increasingly being reported. Pharmacotherapy has an emerging role in the management of small bowel bleeding. Somatostatin analogues are a well tolerated class of drugs that can play an additional role in the management of refractory bleeding secondary to small bowel angioectasias. SUMMARY SBCE is useful in determining the cause of small bowel bleeding. DAE offers an endoscopic therapeutic approach to small bowel bleeding replacing surgery and intraoperative enteroscopy. Pharmacotherapy, in addition to endotherapy, can play an important role in the management of multifocal, recurring bleeding small bowel lesions.
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Liu JH, Liu DY, Wang L, Han LP, Qi ZY, Ren HJ, Feng Y, Luan FM, Mi LT, Shan SM. Animal experimental studies using small intestine endoscope. World J Gastroenterol 2017; 23:3684-3689. [PMID: 28611521 PMCID: PMC5449425 DOI: 10.3748/wjg.v23.i20.3684] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 02/28/2017] [Accepted: 03/21/2017] [Indexed: 02/06/2023] Open
Abstract
AIM To assess the feasibility and safety of a novel enteroscope, negative-pressure suction endoscope in examining the small intestine of a porcine model.
METHODS In vitro experiments in small intestinal loops from 20 pigs and in vivo experiments in 20 living pigs were conducted.
RESULTS In in vitro experiments, a negative pressure of > 0.06 MPa was necessary for optimal visualization of the intestine, and this pressure did not cause gross or histological damage to the mucosa. For satisfactory examination of the small intestine in vivo, higher negative pressure (> 1.00 MPa) was required. Despite this higher pressure, the small intestine did not show any gross or microscopic damage in the suctioned areas. The average time of examination in the living animals was 60 ± 7.67 min. The animals did not experience any apparent ill effects from the procedure.
CONCLUSION Small intestine endoscope was safely performed within a reasonable time period and enabled complete visualization of the intestine in most cases.
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