title: Mechanisms underlying the antireflux action of fundoplication.
abstract: The effect of fundoplication on patterns of gastro-oesophageal reflux and the underlying motor mechanisms were investigated in 18 patients with symptomatic reflux. Oesophageal motility and pH were recorded concurrently after a standard meal. Studies were performed preoperatively and from 5 to 27 months after surgery. Fundoplication virtually eliminated reflux in all but three patients. Control of reflux was associated with a 50% fall in the number of transient lower oesophageal sphincter relaxations, a fall in the proportion of transient lower oesophageal sphincter relaxations accompanied by reflux from 47% to 17%, and an increase in the mean residual pressure at the gastro-oesophageal junction during swallow induced lower oesophageal sphincter relaxation from 0.7 mm Hg to 6.0 mm Hg. Basal pressure at the gastro-oesophageal junction rose from 10.9 mm Hg to 14.5 mm Hg, however, there was no correlation between postoperative reflux and basal gastro-oesophageal junction pressure. These findings suggest that the anti-reflux effects of fundoplication result from changes in the mechanical behaviour of the gastro-oesophageal junction that result in incomplete abolition of the high pressure zone during lower oesophageal sphincter relaxation, and reduced triggering of transient lower oesophageal sphincter relaxations.
authors: Gastroenterology Unit, Royal Adelaide Hospital, South Australia.
authors: A C
authors: AC
authors: Ireland
authors: R H
authors: RH
authors: Holloway
authors: J
authors: J
authors: Toouli
authors: J
authors: J
authors: Dent
mesh_terms: D000328:Adult; D000368:Aged; D004943:Esophagogastric Junction / Q000503:physiopathology; D004947:Esophagus / Q000503:physiopathology; D005260:Female; D005748:Gastric Fundus / Q000601:surgery*; D005764:Gastroesophageal Reflux / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008875:Middle Aged; D010528:Peristalsis; D011312:Pressure