- Failure to relax; referring especially to visceral openings such as the pylorus, cardia, or any other sphincter muscles. [G. a- priv. + chalasis, a slackening]- cricopharyngeal a. functional obstruction at the level of the upper esophageal sphincter due to failure of relaxation of the cricopharyngeal muscles; often associated with a pharyngoesophageal diverticulum. SYN: a. of the upper sphincter, hypertensive upper esophageal sphincter.- esophageal a. failure of normal relaxation of the lower esophageal sphincter associated with uncoordinated contractions of the thoracic esophagus, resulting in functional obstruction and difficulty swallowing. SYN: a. of the cardia, cardiospasm.
* * *acha·la·sia .ā-kə-'lā-zh(ē-)ə n failure of a ring of muscle (as a sphincter) to relax <\achalasia of the esophagus> <\achalasia of the anal sphincter> compare CARDIOSPASM
* * *n.a condition in which the normal muscular activity of the oesophagus (gullet) is disturbed, especially failure of an abnormally strong sphincter at the lower end, which delays the passage of swallowed material. It may occur at any age: symptoms include difficulty in swallowing liquids and solids, slowly increasing over years; sometimes regurgitation of undigested food; and occasionally severe chest pain caused by spasm of the oesophagus. Diagnosis is by a barium X-ray examination and sometimes manometric studies (see manometry). Treatment is by forceful stretching of the tight lower end of the oesophagus (cardia), by surgical splitting of the muscular ring in that area (cardiomyotomy or Heller's operation), or by injecting botulinum toxin into the sphincter.
* * *ach·a·la·sia (ak″ə-laґzhə) [a-1 + chalasia] failure of the smooth muscle fibers of the gastrointestinal tract to relax at a point of junction of one part with another; usually used to denote esophageal achalasia.
Medical dictionary. 2011.
Look at other dictionaries:
Achalasia — Classification and external resources A CXR showing achalasia ( arrows point to the outline of the massively dilated esophagus ) ICD 10 K … Wikipedia
achalasia — ˌakəˈlāzh(ē)ə noun ( s) Etymology: New Latin, from a (II) + Greek chalasis loosening, relaxation (from chalan to loosen + sis) + New Latin ia … Useful english dictionary
Achalasia — La Achalasia es una rara enfermedad en la cual el esófago se encuentra inhabilitado para llevar el alimento hacia el estómago … Enciclopedia Universal
achalasia — noun Etymology: New Latin, from a + Greek chalasis slackening + New Latin ia Date: 1914 failure of a ring of muscle (as the anal sphincter or one of the esophagus) to relax … New Collegiate Dictionary
achalasia — /ak euh lay zheuh, zhee euh, zee euh/, n. Med. inability of a circular muscle, esp. of the esophagus or rectum, to relax, resulting in widening of the structure above the muscular constriction. [1910 15; A 6 + Gk chálas(is) (chala (s. of chalân… … Universalium
achalasia — noun A neuromuscular problem where a ring of muscles is unable to fully relax … Wiktionary
achalasia — n. inability of muscles to relax (Medical) … English contemporary dictionary
achalasia — [ˌakə leɪzɪə] noun Medicine a condition in which the muscles of the lower part of the oesophagus fail to relax, preventing food from passing into the stomach. Origin early 20th cent.: from a 1 + Gk khalasis loosening + ia1 … English new terms dictionary
achalasia — ach·a·la·sia … English syllables
achalasia — cardiospasm; n. a condition in which the normal muscular activity of the oesophagus (gullet) is disturbed, especially failure of an abnormally strong sphincter at the lower end, which delays the passage of swallowed material. It may occur at any… … The new mediacal dictionary