There were no significant differences in the extent of penetration. The onset of the swallowing reflex was significantly earlier after ingestion of thickened carbonated cola than thickened non-carbonated cola ( p = 0.007). The reduction in the amount of residue in both the vallecula ( p = 0.007) and pyriform sinus ( p = 0.004) was greater after ingestion of thickened carbonated cola than thickened non-carbonated cola. Aspiration, penetration, pharyngeal residue, and initiation position of the swallowing reflex were evaluated. Videoendoscopic swallowing evaluations were performed. Thickened carbonated and thickened non-carbonated beverages were used. We enrolled 38 patients with dysphagia and divided them into two groups. Therefore, we investigated the effects of thickened carbonated beverages on swallowing in patients with dysphagia by comparing the swallowing dynamics between thickened carbonated and thickened non-carbonated beverages. However, the effects of carbonation in thickened beverages of the same flavor on swallowing dynamics have not been reported. Carbonated beverages initiate the swallowing reflex earlier than water and have a shorter pharyngeal transit time.
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