Scripties UMCG - Rijksuniversiteit Groningen
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The advantages of high-frame-rate videos in fiber endoscopic evaluation of swallowing.

(2016) Alizadeh Agdam, M.(Mehran)

Objectives: The purpose of this study was to verify whether or not high-frame-rate (HFR) videos were superior to standard-frame-rate (SFR) videos in the visual recognition of motion of the laryngopharyngeal structures during the pharyngeal phase of swallowing.
Method: Five healthy subjects were asked to swallow 0.5 ml water under fiberoptic transnasal laryngoscopy. The endoscope was connected to a high-speed digital imaging (HSDI) camera, which recorded the laryngopharyngeal view throughout the swallowing process at 4000 frames per second (fps). A total of five HFR videos were recorded, and were then copied and downsampled into a standard-frame-rate video version with 30 fps. Fifteen otorhinolaryngologists observed all ten HFR and SFR videos in random order, and rated the videos on a four-point rating scale reflecting the degree of the visual recognition of the rapid motions of the laryngopharyngeal structures just before the ‘white-out’ phenomenon.
Results: The number of observers judging the HFR videos with higher scores compared to the SFR videos was significantly higher for most laryngopharyngeal structures. These structures include: the posterior pharyngeal wall (p=0.001), the left lateral pharyngeal wall (p=0.015), the right lateral pharyngeal (p=0.035), the tongue base (p=0.005), and the epiglottis tilting (p=0.005). Only the recognition of laryngeal elevation (p=0.059) did not seem to benefit from a higher frame rate.
Conclusion: These results demonstrated the superiority of HFR videos compared to SFR videos in the evaluation of the contractive motions of the pharyngeal structures during the pharyngeal phase of swallowing.

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