Figure 2.

Changes in the muscle thickness (MT), muscle cross-sectional area (MCSA), lumen cross-sectional area (LCSA), and impedance values after peroral endoscopic myotomy (POEM) in type I (A), type II (B), and type III achalasia (C). The MT, baseline/contraction MCSA, and baseline impedance significantly increased in type I achalasia. Baseline MT and baseline impedance significantly increased in type II achalasia. LCSA significantly decreased in type I and II achalasia. In contrast, the MT, MCSA, and baseline/nadir impedance significantly decreased, and the LCSA significantly increased in type III achalasia.