lower esophageal sphincter


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Related to lower esophageal sphincter: pyloric sphincter

lower esophageal sphincter

n.
A ring of smooth muscle fibers at the junction of the esophagus and stomach. Also called cardiac sphincter, gastroesophageal sphincter.
References in periodicals archive ?
Aerobic activity also decreases lower esophageal sphincter pressure, increasing risk of erosive esophagitis.
It occurs when the lower esophageal sphincter relaxes too frequently, allowing stomach acid to flow backward into the esophagus.
Q: Will pain stimulate the sympathetic nerve system, causing a decrease in the lower esophageal sphincter tone?
When the lower esophageal sphincter muscle either relaxes inappropriately or is very weak, the acidic contents of the stomach can back up, or reflux, into the esophagus.
It's particularly common among older adults, and occurs because the lower esophageal sphincter, a muscular valve that separates the esophagus from the stomach, becomes too relaxed or weak and allows stomach acid to flow up into the esophagus.
Dysfunction of the lower esophageal sphincter and dysmotility of the tubular esophagus in morbidly obese patients.
With persistent reflux, esophageal motor function becomes increasingly abnormal, leading to further deterioration of lower esophageal sphincter competence.
GERD occurs when the lower esophageal sphincter, a muscular valve that separates the stomach and esophagus, fails to close all the way, allowing the backflow of stomach fluids into the esophagus.
Avoid tight clothing around your abdomen, such as girdles, tight jeans and elastic waist bands, which can increase pressure on your stomach and lower esophageal sphincter.
The following medications can decrease lower esophageal sphincter pressures except:
Classically, achalasia is characterized by incomplete relaxation of the lower esophageal sphincter (LES) with absent peristalsis in the body of the esophagus, (1-3) whereas DES is characterized by normal relaxation of the LES with periods of normal peristalsis interspersed with periods of weakened or absent peristalsis and abnormal simultaneous contractions.
2) Factors predisposing to stricture formation are not well understood, but studies demonstrate that patients with peptic stricture are older, have reflux symptoms of longer duration, have an associated esophageal motility disorder, and have significantly reduced lower esophageal sphincter pressures.

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