Figure 1.

Isobaric contour image generated from binary manometric data. (A) Manoview image of 5 mL water swallow. (B) Isobaric contour generated from MATLAB program. Mesopharyngeal contractile integral (CI) was calculated by amplitude × duration × length (mmHg·sec·cm) of muscular contraction ≥ 70 mmHg. CI of the hypopharynx and upper esophageal sphincter (UES) was calculated in the same manner by amplitude × duration × length (mmHg·sec·cm) of muscular contraction ≥ 70 mmHg for 2 seconds after onset of deglutition. Adapted from Yoon et al.¹¹