Esophageal sphincter

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Related to Esophageal sphincter: esophageal peristalsis

Esophageal sphincter

A circular band of muscle that closes the last few centimeters of the esophagus and prevents the backward flow of stomach contents.
Mentioned in: Achalasia


a circular muscle that constricts a passage or closes a natural orifice. When relaxed, a sphincter allows materials to pass through the opening. When contracted, it closes the opening. The principal abnormalities relate to function. Failure to open may be because of spasm or achalasia, due usually to failure of parasympathetic nerve supply. Failure to close usually due to absence of sympathetic nerve supply. The important sphincters are the anal, ileal, pharyngoesophageal, pupillary, pyloric, reticulo-omasal, teat, urethral, vaginal and vesical.

cardiac sphincter
the functional sphincter at the gastric end of the esophagus.
sphincter control
is by the autonomic nervous system.
esophageal sphincter
see cardiac sphincter.
sphincter of Oddi
bile duct sphincter.
pupillary sphincter
a ring of smooth muscle around the pupillary border of the iris.
References in periodicals archive ?
In this study, it was aimed to demonstrate the efficiencies of 24-hour pH monitoring, esophagus manometer and lower esophageal sphincter vector volume analysis in making the diagnosis and in specifying the treatment option in pediatric patients with suspicious GER and the superiorities of these methods to each other, if present.
Acid reflux can strike any cat at any age, but kittens are at greater risk because their airways and esophageal sphincters are still developing.
15] in their study on twins though found no significant difference in preprandial BLESP in symptomatic versus asymptomatic subjects but found significantly lower postprandial BLESP in symptomatic versus asymptomatic twins with no difference in peristaltic amplitude, LES length, or transient lower esophageal sphincter relaxation (tLESR).
Unfortunately, medications don't work for all GERD patients, and a few require a laparoscopic surgical procedure known as Nissen fundo-plication, in which a surgeon wraps the upper part of the stomach (fundus) around the lower esophageal sphincter to strengthen it.
For example, smoking causes the lower esophageal sphincter to relax, allowing stomach contents to wash back up into the esophagus and trigger GERD symptoms.
Lower esophageal sphincter dysfunction in gastroesophageal reflux disease," Gastroenterol.
She adds, "A pH analysis, to confirm that the symptoms are indeed related to acid reflux, and a manometric examination of the esophagus to assess the pressure of the lower esophageal sphincter for adequate esophageal peristalsis should be obtained before surgery to determine the patient's eligibility.
If lifestyle changes don't work, you may try medications: Antacids (Turns, Rolaids), or a non-prescription histamine-2 receptor antagonist (H2RA) like Tagamet may help; for stronger symptoms, try prescription-strength H2RAs, or acid suppressants such as proton pump inhibitors (PPIs), which include Prilosec, Nexium, and Prevacid, or drugs that strengthen the lower esophageal sphincter.
Wrapping the upper part of the stomach around the lower part of the esophagus, to strengthen the esophageal sphincter in addition to repairing the hiatial hernia, is usually done through key-hole surgery," he said.
A transnasal esophageal pH catheter with a sensor placed 5 cm above the lower esophageal sphincter recorded reflux events and the acid clearance time for each event, while polysomnography recorded reflux-associated arousals and awakenings.
When the lower esophageal sphincter (LES) that separates the esophagus and the stomach fails to close properly, the stomach contents--a mix of food, enzymes, bile, and acid--backwash into the esophagus, often producing the sour taste and discomfort or outright pain of heartburn.
Chronic GERD (gastroesophageal reflux disease) is a painful heartburn caused when stomach acid breaks through what is supposed to be a one-way valve - the lower esophageal sphincter (LES) - and reverses into the esophagus.