Aerophagia, gastric, and supragastric belching: a study using intraluminal electrical impedance monitoring

Bredenoord, A. J.; Weusten, B. L. A. M.; Sifrim, D.; Timmer, R.; Smout, A. J. P. M.
December 2004
Gut;Dec2004, Vol. 53 Issue 12, p1561
Academic Journal
Background: Patients with aerophagia are believed to hove excessive belches due to air swallowing. Intraluminal impedance monitoring has made it possible to investigate the validity of this concept. Methods: The authors measured oesophageal pH and electrical impedance before and after a meal in 14 patients with excessive belching and 14 healthy controls and identified patterns of air transport through the oesophagus. The size of the gastric air bubble was measured radiogrophically. In four patients prolonged oesophageal manometry was performed simultaneously. Results: In all subjects, impedance tracings showed that a significant amount of air is propulsed in front of about a third of the swallow induced peristaltic waves. Two types of retrograde gas How through the oesophagus (belch) were observed. In the first type air flowed from the stomach through the oesophagus in oral direction ("gastric belch"). In the second type air entered the oesophagus rapidly from proximal and was expulsed almost immediately in oral direction ("supragastric belch"). The incidence of air-containing swallows and gastric belches was similar in patients and controls but supragastric belches occurred exclusively in patients. There was no evidence of lower oesophageal sphincter relaxation during supragastric belches. Gastric air bubble size was not different between the two groups. Conclusions: In patients with excessive belching the incidence of gaseous reflux from stomach to oesophagus is similar to that in healthy subjects. Their excess belching activity follows a distinct pattern, characterised by rapid antegrade and retrograde How of air in the oesophagus that does not reach the stomach.


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