Through rhythmic variations, the diaphragm influence lower esophageal sphincter (LES) pressure acting as an external sphincter. LES pressure recording is characterized by increased pressure in inspiration due to contraction of the diaphragmatic crura that involves the sphincter.

What does LES pressure mean?

Although low lower esophageal sphincter (LES) resting pressure, commonly defined as less than 10 mmHg, has traditionally been considered the hallmark of gastroesophageal reflux disease (GERD), it is now recognized that the majority of patients with abnormal reflux (including those with esophagitis) will have a resting …

What is LES resting pressure?

Lower Esophageal Sphincter The LES measures 3–4 cm in length and its resting pressure ranges between 15 and 35 mmHg. At the time of swallowing, the LES relaxes for 5–10 s to allow the food bolus to enter the stomach and then regains its resting tone.