Table 1

Acid exposure time (median % time pH<4 (IQR)) in pH sensors located 1.1 cm proximal to the pH transition point and 5 cm proximal to the upper border LOS in healthy volunteers with hiatus hernia and controls

Hiatus herniaControlsp Value
Acid exposure 5 cm above upper border LOS
 FU0.0 (0.5)0.0 (0.0)0.345
 FS0.0 (0.0)0.0 (0.0)0.285
 PPU1.8 (6.9)0.2 (1.2)0.401
 PPS0.0 (0.0)0.0 (0.0)0.686
Acid exposure 11 mm above pH transition point
 FU1.2 (26.9)0.20 (9.40)0.424
 FS0.45 (6.7)0.10 (13.2)0.314
 PPU4.25 (45)4.0 (17.3)0.330
 PPS5.45 (25.4)0.30 (3.20)0.011
  • FS, fasting supine; FU, fasting upright; LOS, lower oesophageal sphincter; PPS, postprandial supine; PPU, postprandial upright.