Correlation between novel 3D high-resolution manometry esophagogastric junction metrics and pH-metry in reflux disease patients.

BACKGROUND AND AIMS

We recently developed 2 novel 3D high-resolution manometry (HRM) metrics of esophagogastric junction (EGJ) contractility to differentiate the lower esophageal sphincter (LES) and crural diaphragm (CD) elements of EGJ pressure. This study aimed to compare these metrics to the EGJ-contractile integral (EGJ-CI) and to analyze their correlation with esophageal acid exposure time (AET) on pH-metry.

METHODS

Thirty-one gastro-oesophageal reflux disease (GERD) patients and 20 control subjects underwent 24-hour pH-metry and HRM using a 3D-HRM catheter. EGJ metrics were calculated during 3 consecutive respiratory cycles at rest. The EGJ-CI was calculated using the DCI tool in the ManoView software. 3D LES pressure (3D-LESP) and 3D-DHA, a metric quantifying the CD component of the 3D-HRM pressure topography, were calculated using a MATLAB program. Pearson correlation was used to calculate correlations with AET.

KEY RESULTS

3D-LESP, 3D-DHA, and EGJ-CI were all significantly lower in GERD patients than in control subjects (P < .05) and all were significantly correlated with AET (R = -.48, -.42, -.52, respectively, all P < .01). The 3D-DHA and EGJ-CI also strongly correlated with each other (R = .84, P < .001).

CONCLUSIONS & INFERENCES: Both 3D-EGJ metrics were correlated with AET emphasizing the importance of both LES and CD function as a determinant of EGJ competence. 3D-DHA also strongly correlated with the EGJ-CI suggesting that EGJ-CI is strongly driven by the asymmetrical CD pressure component.