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A simplified image showing peristalsis. In the esophagus, two types of peristalsis occur: First, there is a primary peristaltic wave, which occurs when the bolus enters the esophagus during swallowing. The primary peristaltic wave forces the bolus down the esophagus and into the stomach in a wave lasting about 8–9 seconds.
Gastroparesis (gastro- from Ancient Greek γαστήρ – gaster, "stomach"; and -paresis, πάρεσις – "partial paralysis") is a medical disorder of ineffective neuromuscular contractions (peristalsis) of the stomach, resulting in food and liquid remaining in the stomach for a prolonged period of time.
The gastroileal reflex is stimulated by the presence of food in the stomach and gastric peristalsis. Initiation of the reflex causes peristalsis in the ileum and the opening of the ileocecal valve (which allows the emptying of the ileal contents into the large intestine, or colon). [ 1 ]
The peristalsis and segmentation, detailed below and pendular movement are famous examples of distinct patterns of GI contraction. [5] Occurring between meals, the migrating motor complex is a series of peristaltic wave cycles in distinct phases starting with relaxation, followed by an increasing level of activity to a peak level of peristaltic ...
Retroperistalsis is the reverse of the involuntary smooth muscle contractions of peristalsis.It usually occurs as a precursor to vomiting.Local irritation of the stomach, such as bacteria or food poisoning, activates the emetic center of the brain which in turn signals an imminent vomiting reflex.
It is not clear what causes esophageal spasms. [1] [7] Sometimes esophageal spasms start when someone eats hot or cold foods or drinks. However, they can also occur without eating or drinking. [7] The increased release of acetylcholine may also be a factor, but the triggering event is not known. [6] Spasms may also be the result of a food ...
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Ileus is a cause of colic in horses due to functional obstruction of the intestines. It is most commonly seen in horses postoperatively, especially following colic surgery. [ 9 ] Horses experiencing ileus are at risk for gastric rupture due to rapid reflux build-up, and require intense medical management with frequent nasogastric intubation. [ 9 ]