title: Characterization of reflux events after fundoplication using combined impedance-pH recording.
abstract: BACKGROUND
  Laparoscopic fundoplication effectively controls symptoms of gastro-oesophageal reflux disease (GORD) and decreases acid reflux, but its impact on non-acid reflux is not known. The aim of the study was to characterize reflux events after fundoplication using oesophageal combined multichannel intraluminal impedance (MII)-pH monitoring, to demonstrate its efficacy on acid as well as non-acid reflux events.
  
  
  METHODS
  Thirty-six patients in whom ambulatory MII-pH recording was performed after laparoscopic fundoplication were reviewed retrospectively. There were 23 symptomatic and 13 asymptomatic patients, whose results were compared with those of 72 healthy volunteers.
  
  
  RESULTS
  Oesophageal acid exposure was low in all but one operated patient, and there was no difference between those with and without symptoms. The median number of reflux events over 24 h was lower after fundoplication (11 in operated patients compared with 44 in healthy volunteers; P < 0.001). Almost all reflux events were non-acid after surgery whereas acid reflux episodes were predominant in healthy volunteers. Proximal reflux events were less common in operated patients. Non-acid reflux events were significantly associated with symptoms after surgery in some patients.
  
  
  CONCLUSIONS
  Fundoplication restores a competent barrier for all types of reflux. Reflux events are mostly non-acid after surgery, and such events may be positively correlated with symptoms.
authors.affiliation: Hospices Civils de Lyon, Department of Digestive Diseases, Edouard Herriot Hospital, Lyons, France.
authors.forename: S
authors.initials: S
authors.lastname: Roman
authors.forename: G
authors.initials: G
authors.lastname: Poncet
authors.forename: I
authors.initials: I
authors.lastname: Serraj
authors.forename: F
authors.initials: F
authors.lastname: Zerbib
authors.forename: J
authors.initials: J
authors.lastname: Boulez
authors.forename: F
authors.initials: F
authors.lastname: Mion
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D017097:Electric Impedance; D050782:Esophageal pH Monitoring; D005260:Female; D018662:Fundoplication / Q000379:methods*; D005764:Gastroesophageal Reflux / Q000209:etiology / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000209:etiology*; D012189:Retrospective Studies; D016896:Treatment Outcome