Standardizing FLIP Interpretation

Standardizing FLIP (Functional Lumen Imaging Probe) interpretation is crucial for ensuring its reliability and utility in clinical practice, especially for diagnosing and managing esophageal motility disorders. FLIP is a diagnostic tool that uses impedance planimetry to measure the geometry and distensibility of the esophagogastric junction (EGJ) and other parts of the esophagus. It provides valuable insights into esophageal function by assessing parameters like the EGJ distensibility index (EGJ-DI), which can help identify motility disorders such as achalasia.

However, the paper highlights several challenges in standardizing FLIP interpretation. One major issue is the lack of calibration standards across different FLIP systems, which results in inconsistencies due to variations in catheter size, balloon compliance, and software versions. Without harmonized calibration protocols, data reproducibility is compromised, particularly in multicenter studies and artificial intelligence modeling efforts. Furthermore, FLIP is underutilized for longitudinal monitoring, limiting its potential as a tool to track treatment outcomes over time. The absence of clinical correlation between FLIP measurements and validated symptom scores, such as the Eckardt score or EAT-10, further complicates its interpretation.

The authors call for future consensus updates to focus on calibration protocols, predictive modeling, and longitudinal quantification to transform FLIP into a standardized biomarker for esophageal motility assessment. This would enhance its diagnostic accuracy and utility in clinical practice.