Figure 1 - Example of lower esophageal sphincter (LES) rapid pull-through technique (1 cm/s).

The distal margin of the LES high-pressure zone is marked with a red line. The proximal margin of the LES high-pressure zone is marked with a blue line. The length of the LES high-pressure zone averages 4 cm. Note that during this pull-through breathing is withheld at mid-expiration.