there was no significant difference in function of the lower esophageal sphincter , but a significant decrease in mean amplitude ( 15.1 +/- 6.1 versus 29.7 +/- 4.7 mm hg ) and a prolongation in mean duration of the peristaltic wave ( 7.4 +/- 2.8 versus 4.5 +/- 0.2 seconds ) was noted in the upper esophagus .
C0227192
lower esophageal sphincter
C0014876
esophagus