Diurnal motor activities of the esophagus in conscious dogs

Diurnal motor activities of the upper, middle, and lower thirds of the thoracic esophagus, the lower esophageal sphincter, and the gastric body were recorded in six conscious dogs, using extraluminal force transducers. The motor activities of the thoracic esophagus and the lower esophageal sphincter...

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Bibliographic Details
Published in:Digestive diseases and sciences 2000-07, Vol.45 (7), p.1267-1273
Main Authors: HABU, S, MATSUSHIMA, Y, ISHIKAWA, H, SHA, S, OKAMOTO, E
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Circadian Rhythm
Digestion - physiology
Dogs
Eating - physiology
Esophagogastric Junction - physiology
Esophagus - physiology
Fundamental and applied biological sciences. Psychology
Mouth. Exocrine and endocrine salivary glands. Teeth. Esophagus
Muscle Contraction - physiology
Peristalsis - physiology
Transducers
Vertebrates: digestive system
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Summary:Diurnal motor activities of the upper, middle, and lower thirds of the thoracic esophagus, the lower esophageal sphincter, and the gastric body were recorded in six conscious dogs, using extraluminal force transducers. The motor activities of the thoracic esophagus and the lower esophageal sphincter were divided into three major motility patterns: feeding, digestive, and interdigestive. Each motility pattern was basically composed of repetitive bursts of contractions that were clearly classified into type I and II according to their contractile properties. Type I bursts were peristaltic contractions initiated at the upper thoracic esophagus and sequentially propagated distally to include the sphincter. Propagation velocity and duration of type I contractions were similar in all three motility patterns, and these contractions never were propagated into the stomach. Type II bursts were nonperistaltic simultaneous contractions of the thoracic esophagus and lower sphincter appearing synchronously with phase III of gastric interdigestive migrating contractions. Amplitude and duration of type II contractions were maximal at the sphincter, suggesting initiation at that site. In nonfeeding patterns, type I contractions would clear the esophagus of refluxed gastric contents, while type II contractions would prevent reflux.
ISSN:0163-2116
1573-2568
DOI:10.1023/a:1005531331254