Mechanisms of Impaired Swallowing on Thin Liquids Following Radiation Treatment for Oropharyngeal Cancer.
Carly E A Barbon, Douglas B Chepeha, Andrew J Hope and 3 others
PMID 32755497WHAT IT FOUND
Swallowing safety after radiation depends on how quickly the airway closes.
Patients who aspirated took significantly longer to close their laryngeal vestibule than those who did not. Incomplete closure was also strongly linked to aspiration, but overall residue levels did not differ significantly from healthy controls.
Key findings
01Penetration-aspiration events were significantly more common in the cancer cohort (9 of 12) than in controls (1 of 12).
02Time to laryngeal vestibule closure was significantly longer in patients with impaired safety (326 ms) compared to healthy controls (91 ms).
03Incomplete laryngeal vestibule closure was significantly associated with impaired swallowing safety, occurring in 70% of unsafe swallows.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The sample was very small (12 patients) and consisted entirely of males, which limits generalizability. Raters were not blinded to the participant group (healthy vs. cancer), which could introduce bias in the analysis of swallowing mechanics. The study only assessed thin liquids; results may differ with thicker consistencies. Stopping rules meant some patients had fewer than three swallows analyzed, focusing on the worst-case scenario rather than average performance.
Declared interests
Funding was provided by the National Institute on Deafness and Other Communication Disorders (Grant DC011020).
The easy way to misread this
Do not assume that increased pharyngeal residue is the primary driver of dysphagia in this early post-radiation window. The study found that residue levels were not significantly different from healthy controls, while delayed airway closure timing was the critical factor associated with aspiration.