Fig. 2.

The calculation of EGJ-DCI. At the baseline state, a swallow frame was added on three respiration cycles beginning at the inspiration. Using the isobaric contour, a pressure with 2 mmHg higher than the intragastric pressure was setup as the barrier margin. Then the DCI tool was used to measure the value of EGJ-DCI. a The changes of total esophageal pressure at rest were shown by HRM. The yellow box was used to show the region chose to calculate EGJ-DCI. The LES and CD were superimposed. b The calculation of EGJ-DCI. The CD component was excluded when the distance between LES and CD was more than 2 cm