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The effect of position on esophageal structure and function determined with solid-state high-resolution manometry.

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Posture significantly impacts esophageal sphincter function, particularly the lower esophageal sphincter (LES). Upright positions reduce LES resting pressure and integrated relaxation pressure, necessitating position-specific normal value establishment.

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Area of Science:

  • Gastroenterology
  • Physiology
  • Medical Devices

Background:

  • Esophageal sphincter function is crucial for preventing gastroesophageal reflux.
  • Posture can influence gastrointestinal physiology, but its specific effects on esophageal sphincters require detailed investigation.

Purpose of the Study:

  • To investigate the influence of body posture on the anatomy and function of the esophageal sphincters.
  • To compare esophageal sphincter measurements in supine versus upright positions using high-resolution manometry.

Main Methods:

  • Esophageal manometry was performed on 50 individuals using a 36-channel solid-state catheter in both supine and upright positions.
  • Measurements included lower esophageal sphincter (LES) length and pressure, upper esophageal sphincter (UES) residual pressure, and 4-second integrated relaxation pressure during water swallows.
  • Bland-Altman analysis assessed agreement between supine and upright measurements.

Main Results:

  • The lower esophageal sphincter (LES) resting pressure was significantly lower in the upright position (13.85 mmHg) compared to the supine position (18.09 mmHg).
  • Integrated relaxation pressures were weaker in the upright position (5.66 mmHg) versus the supine position (7.80 mmHg).
  • Upright posture resulted in longer esophageal length and a lower upper border of the LES.

Conclusions:

  • Body position significantly influences the lower esophageal sphincter (LES) more than the upper esophageal sphincter (UES).
  • Establishing normal values for LES basal and residual pressures specific to different body positions is essential for accurate clinical assessment.