Clinical and functional characterization of high gastroesophageal reflux.

In 70 consecutive patients with symptoms of gastroesophageal reflux (GER), we studied lower esophageal sphincter (LES) and upper esophageal sphincter (UES) pressures, esophageal peristalsis, and esophageal acid exposure 5 and 20 cm above the LES. Based on the percentage of time the pH was below 4 in the proximal esophagus, the patients were divided into 2 groups: (1) group A, less than 3%, 48 patients; (2) group B, greater than 3%, 22 patients. LES was weaker (13.5 +/- 6.0 mm Hg in group A versus 7.8 +/- 4.6 mm Hg in group B) and shorter (2.2 +/- 0.7 cm in group A versus 1.5 +/- 0.5 cm in group B) in group B patients. Group B patients also had lower amplitude of peristalsis in the proximal (59.2 +/- 17.6 mm Hg in group A versus 42.4 +/- 18 mm Hg in group B) and distal esophagus (89.7 +/- 25.2 mm Hg in group A versus 54.7 +/- 27.9 mm Hg in group B) and lower UES pressures (73.7 +/- 30.7 mm Hg in group A versus 54.7 +/- 29.3 mm Hg in group B). Forty-one percent of group B patients had pulmonary aspiration, whereas only 2% of the patients in group A experienced pulmonary aspiration. These data show that, in a subgroup of patients with symptoms of GER, the upper esophagus is exposed to acid for more than 3% of the time. Patients with high GER differ clinically and pathophysiologically from those in whom reflux is limited to the distal part of the esophagus: those with high GER have a panesophageal motor dysfunction and a high risk of aspiration.