Liquid pressure versus surface pressure of the esophagus.

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Abstract
Intraesophageal pressure was measured in the excised esophagus of dogs via a moveable glass tube attached to a gauge at the same level as the open tip of the tube. When the excised esophagus was emptied of liquid and air, supported in a vertical position, and the glass tube filled with H2O, intraesophageal pressure (PIL) relative to ambient pressure (PA) varied as the end of the glass tube within the esophagus was moved to different levels. A liquid-filled tube within the lumen of the esophagus measures the liquid pressure within the lumen of the esophagus, and the liquid pressure bears no fixed relation to the surface pressure (surrounding pressure) of the esophagus. The intraesophageal balloon pressure, although somewhat higher than the pressure at the surface of the esophagus, holds a relatively fixed relation to the surface pressure. A liquid-filled tube within a potential tissue space, i.e., pleural space, pericardial space, collapsed esophagus, appears to transmit the liquid pressure rather than the surface pressure, and these pressures are not necessarily the same.

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