Difference in meal-related esophageal intraluminal impedance change between gastroesophageal reflux disease and functional disorders.

Objectives: Gastroesophageal reflux disease (GERD) has overlapping symptoms with functional disorders such as functional heart burn. Twenty-four-hour pH with impedance monitoring is useful for differentiation. The intraluminal impedance change with meal in distal esophagus is not investigated.