Pyloric Functional Lumen Imaging Probe Measurements Are Dependent on Balloon Position

Area of Science:

• Gastroenterology
• Medical Devices
• Diagnostic Technology

Background:

• The functional lumen imaging probe (FLIP) is utilized to evaluate pyloric dysfunction in gastroparesis patients.
• Understanding the impact of FLIP catheter positioning is essential for accurate pyloric assessments.

Purpose of the Study:

• To investigate how different functional lumen imaging probe (FLIP) catheter positions influence pyloric measurements.
• To determine the effect of FLIP balloon placement on pressure, cross-sectional area, and distensibility indices.

Main Methods:

• Prospective enrollment of patients with chronic unexplained nausea and vomiting or gastroparesis undergoing endoscopy.
• FLIP balloon positioned in proximal, middle, and distal pyloric locations, measuring cross-sectional area (CSA), pressure (P), and distensibility indices (DI) at various volumes.
• Fluoroscopic imaging confirmed balloon geometry; data analyzed using FLIP Analytic and MATLAB software.

Main Results:

• Twenty-two patients (4 CUNV, 18 gastroparesis) were studied.
• Proximal FLIP positions yielded significantly higher pressures compared to middle and distal positions.
• Higher CSA measurements were observed in proximal and middle positions (30-40 mL) versus distal.
• Lower distensibility indices (DI) were noted in proximal positions (40-50 mL) compared to middle and distal positions.

Conclusions:

• FLIP balloon positioning within the pylorus directly alters balloon geometry, significantly affecting pressure, CSA, and DI measurements.
• Standardization of pyloric FLIP protocols and potential adjustments to balloon design are necessary for reliable application of this technology.
• Accurate pyloric function assessment requires careful consideration of FLIP device placement.