Calculation of esophagogastric junction vector volume using three-dimensional high-resolution manometry.

Area of Science:

• Gastroenterology and Digestive Physiology
• Medical Device Technology
• Surgical Assessment Techniques

Background:

• Lower esophageal sphincter vector volume (V-V) quantifies sphincter integrity for selecting surgical candidates with defective valves.
• Traditional V-V calculation requires invasive motorized pull-through manometry and complex reconstruction.
• Emerging three-dimensional high-resolution manometry (3D-HRM) offers potential for real-time V-V assessment.

Purpose of the Study:

• To evaluate the feasibility of calculating V-V using a novel 3D-HRM assembly.
• To compare V-V measurements obtained via real-time 3D-HRM with simulated analogous measures.
• To explore the role of the diaphragmatic hiatus and crural repair in GERD pathophysiology.

Main Methods:

• Eight asymptomatic individuals underwent stationary and pull-through 3D-HRM across the esophagogastric junction (EGJ).
• A 9-cm 3D segment with 12 rings of 8 pressure sensors recorded pressure data.
• Cross-sectional vector areas (CSVAs) were computed, and V-V was calculated using three methods: real-time 3D-HRM, three-station composite, and single-sensor ring measurements.

Main Results:

• Real-time V-V calculation using 3D-HRM was demonstrated as feasible.
• No statistically significant differences were observed among the three V-V calculation methods.
• All methods revealed significant differences in V-V between inspiratory and expiratory phases.

Conclusions:

• Real-time V-V calculation is feasible with 3D-HRM, offering a potentially less invasive alternative.
• The study underscores the significant role of the diaphragmatic hiatus in GERD.
• Findings highlight the importance of crural repair during antireflux surgery.