Figure 7 - Recording of pharyngoesophageal motility in a patient with dysphagia due to a cricopharyngeal bar.

Responses to 1- and 5-mL water boluses are shown. Note that with the smaller 1-mL bolus, UES relaxation is complete and there is only a small intrabolus pressure (shaded). With the larger 5-mL bolus, UES relaxation appears to be incomplete. However, this is an artefact due to the effects of the higher intrabolus pressure on the sleeve recording.