Fig. 1. Supragastric belching (SGB) and gastric belching (GB). (A) SGB was defined as a rapid rise in impedance (≥ 1000 Ω) moving in an aboral direction, followed by a return to baseline moving in the oral direction. (B) GB was defined as an elevation of intraluminal impedance (≥ 1000 Ω), including pure gas and mixed liquid gas reflux episodes, moving in the oral direction and reaching the most proximal impedance recording segment. Modified from Bredenoord et al.
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