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A and B: M-mode ultrasound and high resolution manometry (HRM) plots during swallow at 6 cm (A) and at 12 cm (B) above LES. Superimposed on the HRM plots are changes (ratio to baseline muscle thickness) in CM (orange) and LM (pink), and ratio of the LM to CM change is also shown (yellow). Note that the increase in CM thickness during peristaltic contraction is significantly greater than that of the LM.
