has part has part has_part characteristic of abnormal esophageal peristalsis abnormal gastroesophageal sphincter physiology esophageal achalasia failure of the normal relaxation of the lower esophageal sphincter associated with the uncoordinated contractions of the thoracic esophagus, resulting in functional obstruction cardiospasm MP:0011570 2012-01-18T10:35:52Z achalasia of the cardia csmith MPheno.ontology gastroesophageal sphincter