FIGURE 1. A) Hiatal hernia in conventional manometry: note the corresponding pressure zone to the diaphragm (1) and the corresponding pressure zone at the LES (2); B) morphology of the gastroesophageal junction in high resolution manometry: types are ranked according to the degree of dissociation of the diaphragm corresponding to the pressure (D) and lower esophageal sphincter (LES).
