Normal Values of High-Resolution Manometry in Supine and Upright Positions in a Thai Population.

Background: Although cut-off values used in high-resolution manometry (HRM) to diagnose esophageal motility disorders are based on representative samples of the US population and assume a supine position, differences in population and body positioning can reportedly affect results.

Aims: To establish normal HRM values for Thai people in both supine and upright positions.

Methods: Forty-one healthy subjects were recruited, each of whom underwent solid-state HRM with ten 5-mL swallows of water in both the supine and upright positions.