title: Segmental absence of contraction in the upper third of the esophagus.
abstract: In a manometric study of esophageal motility, segmental absence of contraction was encountered in the upper third of the esophagus in five patients, although only two of them had complained about dysphagia. If the manometric patterns were identical in the patients with and without dysphagia, it is difficult to explain this symptom in all the cases.
mesh_terms: D000328:Adult; D003680:Deglutition Disorders / Q000503:physiopathology*; D004947:Esophagus / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008365:Manometry; D008875:Middle Aged; D010528:Peristalsis; D011312:Pressure