Video 2 - Example of videoswallow and concurrent manometric tracing from a patient with severe dysphagia secondary to lateral medullary infarction causing failed UES relaxation and marked pharyngeal weakness.
From the following article
Clinical disorders of the upper esophageal sphincter
Ian J. Cook,
GI Motility online (2006)
doi:10.1038/gimo37
Note in this example that the pharyngeal response is very feeble, giving rise to low amplitude synchronous pressure waves within the pharynx. There is very poor clearance of the swallowed bolus from the pharynx and significant aspiration of contrast. (Source: Williams et al.,5 with permission from American Journal of Physiology.)
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