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ejection of food and other matter from the stomach through the mouth, often preceded by nauseanausea,
sensation of discomfort, or queasiness, in the stomach. It may be caused by irritation of the stomach by food or drugs, unpleasant odors, overeating, fright, or psychological stress. It is usually relieved by vomiting.
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. The process is initiated by stimulation of the vomiting center of the brain by nerve impulses from the gastrointestinal tract or other part of the body. The vomiting center then sends out nerve impulses that precipitate spasmodic muscular contractions of the stomach wall and downward spasms of the diaphragm. The pressure generated then forces up the contents of the stomach. The vomiting mechanism may be in response to local irritation (diseases or disorders of the gastrointestinal tract, overburdening of the capacity and digestive capabilities of the stomach, ingestion of harmful foods or substances) or result from a metabolic disturbance (as in pregnancy) or from disorders or stimulation of the nervous system (e.g., migraine, motion sickness, infectious disease, brain tumor or injury, disagreeable odors). Vomiting may also be a reflex action to other spasmodic conditions (whooping cough, gagging).



a complex reflex action, during which the stomach contents are involuntarily expulsed through the mouth as a result of the excitation of the vomiting center, located in the medulla oblongata.

During vomiting, the pylorus undergoes a spasm and the cardia of the stomach opens. As a result of antiperistaltic contractions, food travels from the stomach to the esophagus and is expulsed to the outside by the spasmodic and jerky contraction of the respiratory musculature and muscles of the anterior abdominal wall. At the same time, the larynx rises and the epiglottis falls, which causes the glottis to close, thus preventing the vomit from entering the respiratory tract. The vomit is hindered from entering the nasal cavity by the raised soft palate.

Vomiting may be provoked by irritants acting on gastric mucosa, by the direct effect of toxins on the vomiting center, and by the stimulation of receptors, for example, in diseases of the abdominal organs, the brain, and meninges. Psychogenic and conditioned-reflex vomiting is also possible.

Vomiting is generally a defensive act because it helps remove harmful substances from the stomach. However, frequent vomiting, for example, the indomitable vomiting that occurs during pyloristenosis, may result in dehydration and disturbances of mineral metabolism and acid-base equilibrium.

Vomiting is dangerous during alcoholic intoxication and coma and when a patient is recovering from general anesthesia; atony of the epiglottis and soft palate may permit vomit to enter the nasal cavity and upper respiratory tract, which can cause asphyxia.

Vomiting is a specific symptom of many pathological conditions in such animals as carnivores, omnivores, and ruminants.


References in periodicals archive ?
It has been found that psychological stress may be involved in the beginning of cyclic vomiting syndrome attacks and interiorized psychiatric diseases including especially anxiety disorder and mood disorders and psychosomatic complaints are observed frequently (3, 4).
DISCUSSION: Cyclic vomiting syndrome was first described by Samuel Gee in 1882 (3) and named cyclic vomiting by Smith in 1937 (4).
Cyclic Vomiting Syndrome is defined as recurrent episodes of vomiting with normal periods of health in between episodes.
The disorder may be the cause of repeat visits to emergency departments, unnecessary surgeries and diagnostic tests, and substance abuse, according to participants at the first-ever symposium devoted to cyclic vomiting syndrome (CVS) in adults.
Cyclic vomiting syndrome (CVS), sometimes referred to as an "abdominal migraine," is a rare and unexplained disorder of children, and some adults, which was described by Dr.
The dominant diagnosis is fetal alcohol syndrome (FAS) with severe cyclic vomiting syndrome (CVS).
Metabolic screening also can yield some information about mental disorders, but is really worthwhile only in patients with dear signs of metabolic disorder, such as a history of lethargy, cyclic vomiting, early seizures, dysmorphisms, mental retardation, or regression.
RELATED ARTICLE: Knowledge, patience key to managing the four phases of cyclic vomiting syndrome.
There is another condition, cyclic vomiting, which is sometimes considered in children whose vomiting has gone on for a significant period of time with no other diagnostic explanation.
The cyclic vomiting syndrome of infancy is now believed to be a migraine phenomenon, according to Dr.
Boston -- Recognizing the red flags in children with suspected cyclic vomiting syndrome-unusual GI symptoms, metabolic triggers, and abnormal neurologic symptoms--forms the basis of a new treatment algorithm, Dr.