Prolonged swallowing time in dysphagic Parkinsonism patients with aspiration pneumonia

Lin CW, Chang YC, Chen WS, Chang K, Chang HY, Wang TG.

Arch Phys Med Rehabil. 2012 Jul 27. [Epub ahead of print]



To quantitatively measure which dysphagic features, including swallowing time and hyoid bone displacement, would be associated with increased risk of aspiration pneumonia in dysphagic Parkinsonism patients.


Clinical survey


Tertiary care center


25 patients with Parkinsonism and dysphagia, referred for videofluoroscopic swallowing study, were recruited by retrospective review of medical records. They were divided into two groups according to the history of aspiration pneumonia.


Not applicable.


Swallowing time including onset of pharyngeal swallowing, oral transit time, and pharyngeal transit time, and maximum hyoid bone displacement including total, horizontal, and vertical displacement during swallowing in thin and thick bariums were recorded.


Patients with history of aspiration pneumonia had significantly longer pharyngeal transit time (4.14 vs. 2.31s, p=0.038) and onset of pharyngeal swallowing (2.16 vs. 1.04 s, p= 0.031) than those without, when swallowing thin barium. Patients with aspiration pneumonia also had significantly longer swallowing time when swallowing thick barium (oral transit time 7.14 vs. 2.33 s, p=0.018; pharyngeal transit time 6.39 vs. 1.23, p=0.004; onset of pharyngeal swallowing 5.11 vs. 0.31, p=0.006). There was no significant difference in hyoid bone displacement between the two groups.


Patients with Parkinsonism dysphagia and aspiration pneumonia had longer swallowing time than those without, but no difference in displacement of hyoid bone.

Copyright © 2012 the American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.


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