Figure 1.

Combined esophageal pH monitoring and multichannel intraluminal impedance (EPM-MII) tracing illustrating an acid gastroesophageal reflux (AGER) event. The volume clearance (VC) component (17:20:41→17:21:02) is followed within 30 seconds by a post-reflux swallow-induced peristaltic wave (PSPW) (17:21:24) that occurred during the beginning of chemical clearance (CC). The AGER episode is eventually cleared at 17:22:19 by a clearing swallow (17:22:16). VC lasted 21 seconds and acid neutralization during CC (AN-CC) lasted 1 minute 17 seconds.