Figure 2.

Supragastric belching (SGB) related to reflux. (A) SGB was regarded as “isolated belching” when the belch was unrelated to a reflux event. (B) “Preceding belching” was defined as a belch that occurred immediately prior (< 1 second) to the onset of the reflux episode, which appeared as a > 50% reduction in impedance level. (C) “During-isolated belching” was defined as a belch that occurred during the reflux episode but did not induce re-reflux. (D) “During-preceding belching” was defined as a supragastric belch that preceded the during the reflux period (re-reflux). (E) “Following belching” was defined as a belch that occurred immediately after the reflux episode (< 1 second). Modified from Hemmink et al.⁴