title: Classification of functional bowel disorders by objective physiological criteria based on endoluminal image analysis.
abstract: We have previously developed an original method to evaluate small bowel motor function based on computer vision analysis of endoluminal images obtained by capsule endoscopy. Our aim was to demonstrate intestinal motor abnormalities in patients with functional bowel disorders by endoluminal vision analysis. Patients with functional bowel disorders (n = 205) and healthy subjects (n = 136) ingested the endoscopic capsule (Pillcam-SB2, Given-Imaging) after overnight fast and 45 min after gastric exit of the capsule a liquid meal (300 ml, 1 kcal/ml) was administered. Endoluminal image analysis was performed by computer vision and machine learning techniques to define the normal range and to identify clusters of abnormal function. After training the algorithm, we used 196 patients and 48 healthy subjects, completely naive, as test set. In the test set, 51 patients (26%) were detected outside the normal range (P < 0.001 vs. 3 healthy subjects) and clustered into hypo- and hyperdynamic subgroups compared with healthy subjects. Patients with hypodynamic behavior (n = 38) exhibited less luminal closure sequences (41 ± 2% of the recording time vs. 61 ± 2%; P < 0.001) and more static sequences (38 ± 3 vs. 20 ± 2%; P < 0.001); in contrast, patients with hyperdynamic behavior (n = 13) had an increased proportion of luminal closure sequences (73 ± 4 vs. 61 ± 2%; P = 0.029) and more high-motion sequences (3 ± 1 vs. 0.5 ± 0.1%; P < 0.001). Applying an original methodology, we have developed a novel classification of functional gut disorders based on objective, physiological criteria of small bowel function.
authors.affiliation: Digestive System Research Unit, University Hospital Vall d'Hebron; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd); Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain;
authors.forename: Carolina
authors.initials: C
authors.lastname: Malagelada
authors.affiliation: Computer Vision Center, Bellaterra, Spain; and.
authors.forename: Michal
authors.initials: M
authors.lastname: Drozdzal
authors.affiliation: Computer Vision Center, Bellaterra, Spain; and Applied Mathematics and Analysis Department, University of Barcelona, Barcelona, Spain.
authors.forename: Santi
authors.initials: S
authors.lastname: Seguí
authors.affiliation: Digestive System Research Unit, University Hospital Vall d'Hebron; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd); Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain;
authors.forename: Sara
authors.initials: S
authors.lastname: Mendez
authors.affiliation: Computer Vision Center, Bellaterra, Spain; and Applied Mathematics and Analysis Department, University of Barcelona, Barcelona, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Vitrià
authors.affiliation: Computer Vision Center, Bellaterra, Spain; and Applied Mathematics and Analysis Department, University of Barcelona, Barcelona, Spain.
authors.forename: Petia
authors.initials: P
authors.lastname: Radeva
authors.affiliation: Digestive System Research Unit, University Hospital Vall d'Hebron; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd); Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain;
authors.forename: Javier
authors.initials: J
authors.lastname: Santos
authors.affiliation: Digestive System Research Unit, University Hospital Vall d'Hebron; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd); Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain;
authors.forename: Anna
authors.initials: A
authors.lastname: Accarino
authors.affiliation: Digestive System Research Unit, University Hospital Vall d'Hebron; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd); Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain;
authors.forename: Juan-R
authors.initials: JR
authors.lastname: Malagelada
authors.affiliation: Digestive System Research Unit, University Hospital Vall d'Hebron; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd); Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain; azpiroz.fernando@gmail.com.
authors.forename: Fernando
authors.initials: F
authors.lastname: Azpiroz
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000465:Algorithms; D053704:Capsule Endoscopy; D004435:Eating; D005260:Female; D005767:Gastrointestinal Diseases / Q000145:classification* / Q000473:pathology* / Q000503:physiopathology; D005769:Gastrointestinal Motility; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007413:Intestinal Mucosa / Q000473:pathology / Q000503:physiopathology; D007421:Intestine, Small / Q000473:pathology* / Q000503:physiopathology; D000069550:Machine Learning; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D013270:Stomach / Q000033:anatomy & histology; D055815:Young Adult
keywords: capsule endoscopy; computer vision analysis; functional bowel disorders; intestinal motility; machine learning