Measurement of Intraesophageal Pressure

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Abstract
Measurements of intraesophageal pressures were taken by passing a polyethylene catheter via the nose. Comparison of 3 methods was made: a water-filled catheter, and an air-filled catheter, the tip of which was covered by a short balloon (3 cm long) or a long balloon (16 cm long). The long-balloon method was superior to the short-balloon method. When the long-balloon method was compared with the water -filled method pressure tracings showed less variation with changes in position of the tube in the esophagus. However, the water-filled system has disadvantages in that it can not readily be used to record pressure difference and is more sensitive to motion artefact. Abnormally high readings may be obtained within 3 cm of the cardiac sphincter during quiet breathing. Advantages are that specially made balloons are not required and the tube is easier to pass.
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