Journal of Neurogastroenterology and Motility : eISSN 2093-0887 / pISSN 2093-0879

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Fig. 1. The illustration of measurement of manometry and functional luminal image probe (FLIP) in the gastrointestinal (GI) tract of humans. Conventionally used manometry can measure the active inner contractility of GI tract. Without active swallowing of bolus, manometry cannot produce a significant signal. However, FLIP can measure the passive outer distensibility of GI tract. FLIP assesses the “esophageal response to distension,” with a degree of active distension from the FLIP filling protocol. Moreover, it can measure some degree of active esophageal muscle contraction and tone that occur as the esophagus’s response to the distension. Moreover, FLIP measures the “distensibility of the esophageal wall” (from inside the lumen, assessing the contribution of the mucosa and inner and outer muscle layers). Therefore, these 2 tests are complementary to each other.
J Neurogastroenterol Motil 2022;28:509~511
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