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Mechanisms underlying excessive esophageal acid exposure in patients with gastroesophageal reflux disease

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Abstract

The cause of reflux esophagitis (RE) is excessive esophageal acid exposure. Acid reflux and acid clearance after acid reflux are important factors related to excessive esophageal acid exposure. The main mechanism responsible for acid reflux is transient lower esophageal sphincter relaxation (TLESR), which is LES relaxation not associated with swallowing, and acid reflux caused by low LES pressure is rare. The frequency of TLESR in the postprandial period does not significantly differ between healthy subjects and gastroesophageal reflux disease (GERD) patients; however, the proportion of acid reflux episodes during TLESR is significantly higher in GERD patients. The layer of acid that appears above the dietary layer immediately below the esophagogastric junction (acid pocket) is attracting increasing attention as a cause of the difference in the proportion of acid reflux episodes during TLESR. The proportion of acid reflux episodes during TLESR is significantly higher when the acid pocket is present in the hernia sac than when it is located below the diaphragm. The acid pocket also shows upward migration and reaches the esophageal side of the esophagogastric junction, and the acid pocket itself has been suggested to cause mucosal damage in the lower esophagus. The amplitude and success rate of primary peristalsis decreases with increases in the severity of RE, leading to excessive esophageal acid exposure. Furthermore, the success rate of secondary peristalsis is lower in GERD patients than in healthy subjects.

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Authors and Affiliations

  1. Department of Gastroenterology, Nippon Medical School, Graduate School of Medicine, 1-1-5 Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan

    Katsuhiko Iwakiri, Shintaro Hoshino & Noriyuki Kawami

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  1. Katsuhiko Iwakiri
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  2. Shintaro Hoshino
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  3. Noriyuki Kawami
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Correspondence to Katsuhiko Iwakiri.

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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation and with the Helsinki Declaration of 1964 and later versions. Informed consent was obtained from all patients included in the cited studies.

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Iwakiri, K., Hoshino, S. & Kawami, N. Mechanisms underlying excessive esophageal acid exposure in patients with gastroesophageal reflux disease. Esophagus 14, 221–228 (2017). https://doi.org/10.1007/s10388-017-0575-7

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