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Molfenter, Sonja M.; Leigh, Chelsea; Steele, Catriona M. (2014)
Languages: English
Types: Article
Subjects: Article

Classified by OpenAIRE into

mesheuropmc: digestive, oral, and skin physiology, otorhinolaryngologic diseases
This study builds on previous work by Kendall, Leonard and McKenzie, which investigated event sequence variability for 12 paired-events during swallowing by healthy volunteers. They identified four event pairs, which always occurred in a stereotyped order as well as a most-common occurring overall order of events during swallowing. In the current study, we investigate overall event sequencing and the same four paired-events in a sample of swallows by healthy, young (under 45 years old) volunteers. Data were collected during a 16-swallow lateral videofluoroscopy protocol, which included manipulations of bolus volume, barium density, bolus viscosity and swallow cueing. Our results agree with previous findings regarding the fact that variable event sequencing is found in healthy swallowing, and regarding the obligatory sequencing of two paired-events: movement of the arytenoids towards the base of the epiglottis begins prior to upper esophageal sphincter (UES) opening; and maximum hyo-laryngeal approximation occurs after UES opening. However, our data failed to replicate the previous finding of obligatory sequencing of maximum pharyngeal constriction after maximal UES distension and UES opening occurring before bolus arrival at the UES. The most-common observed overall event sequence reported by Kendall was observed in only 4/293 swallows in our dataset. Manipulations of bolus volume, bolus viscosity, barium concentration, swallow cueing and swallow repetitions could not completely account for differences observed between the two studies.
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