Assessing Treatment Outcomes in Achalasia Using 4-Dimensional High-resolution Impedance Manometry

Area of Science:

• Gastroenterology
• Medical Devices
• Diagnostic Tools

Background:

• Achalasia treatment response assessment often requires multiple procedures.
• Current methods may not fully capture treatment efficacy.
• There is a need for innovative, objective metrics.

Purpose of the Study:

• To investigate novel metrics derived from 4-dimensional high-resolution impedance manometry (4D HRM).
• To assess the utility of these metrics in evaluating treatment response in achalasia patients.

Main Methods:

• A cohort of 53 achalasia patients treated with pneumatic dilation or myotomy was analyzed.
• High-resolution impedance manometry (4D HRM) was performed pre- and post-treatment.
• Python-based analysis measured clearance ratio, intrabolus pressure (IBP), and other parameters.

Main Results:

• Changes in clearance ratio and IBP showed superior performance in predicting abnormal timed barium esophagram (TBE) outcomes.
• A combined metric of clearance ratio and IBP demonstrated high positive predictive value for normal TBE outcomes.
• Metrics related to poor symptomatic outcomes also showed promising predictive capabilities.

Conclusions:

• Intrabolus pressure (IBP) and clearance ratio are valuable for identifying abnormal barium retention post-treatment.
• 4D manometry offers a complementary approach to assess achalasia treatment response.
• These metrics can aid in evaluating treatment efficacy alongside TBE or functional lumen imaging probe.