Table 2

Normal oesophageal manometric features

 Basal LOS pressure10–45 mm Hg (mid respiratory pressure measured by station pull through technique)
LOS relaxation with swallowComplete (to a level <8 mm Hg above gastric pressure)
Wave progressionPeristalsis progressing from UOS through LOS at a rate of 2–8 cm/s
Distal wave amplitude30–180 mm Hg (average of 10 swallows at two recording sites positioned 3 and 8 cm above the LOS)
  • LOS, lower oesophageal sphincter; UOS, upper oesophageal sphincter.