[abstract] GASTROESOPHAGEAL DYNAMICS DURING IMMERSION IN WATER TO THE NECK.

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[abstract] GASTROESOPHAGEAL DYNAMICS DURING IMMERSION IN WATER TO THE NECK.

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Title: [abstract] GASTROESOPHAGEAL DYNAMICS DURING IMMERSION IN WATER TO THE NECK.
Author: Johnson, LF; Lin, YC; Hong, SK
Abstract: Symptoms of gastroesophageal reflux are common complaints in some individuals during immersion. Using a Honeywell esophageal catheter (model 31) with 3 built-in pressure transducers 5 cm. apart and a Beckman pH electrode (No. 39042), measurements of gastric pressure (PG), esophageal pressure (PE), location and pressure of distal esophageal sphincter (DES), and location of respiratory inversion point (RIP) and point of maximal pH change (PMpHC) were made in 5 healthy male subjects standing in air (A), standing in thermoneutral water to the neck (B), and standing in air with abdominal compression (C) . PG increased from 4.6 + 0.6 (SE) rnm Hg in A to nearly 20 mm Hg in B and C, while PE increased from -6.0 + 0.8 mm Hg in A to -0.8 + 1.0 and -3.4 20.9 nun Hg in B and C, respectively. The pressure of the DES remained at 11-15 nun Hg and the length of the DES did not change. The DES and RIP shifted cephalad 2-3 cm. in B and C, as did the PMpHC with B. Esophageal peristaltic waves did not change. It is concluded that immersion in water to the neck doubles the gastroesophageal gradient (PG-Pp) and causes a cephalad displacement of DES and RIP; partly as a result of abdominal compression by the hydrostatic pressure. It is speculated that these changes in the absence of DES pressure change predispose some individuals to gastroesophageal reflux during aquatic pursuits.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held May 10-11, 1974. Hilton Hotel, Washington, D.C. (http:www.uhms.org)
URI: http://archive.rubicon-foundation.org/52
Date: 1974

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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