Movement of the hyoid bone and the epiglottis during swallowing in patients with dysphagia from different etiologies.
OBJECTIVE
(1) To compare the kinematic motion of the hyoid bone and the epiglottis in healthy controls and a sample of patients with dysphagia of different etiologies, and (2) to evaluate the potential value of kinematic swallowing analysis to differentiate the mechanism of dysphagia.


METHODS
We performed two-dimensional video motion analysis of the hyoid bone using videofluoroscopic images in nine controls without any swallowing difficulty, and seven patients with supratentorial stroke, three patients with inflammatory myopathy who showed dysphagia. Main outcome measures were: (1) horizontal and vertical excursion of the hyoid bone, and rotation of the epiglottis, and (2) trajectory of the hyoid bone and epiglottis during swallowing.


RESULTS
Horizontal excursion of the hyoid bone and rotation of the epiglottis were reduced in patients with myopathy as compared to control and patients with stroke (P<0.05). Patients with dysphagia showed different patterns as compared to control in trajectory analysis according to their etiology.


CONCLUSIONS
We conclude that extent and pattern of movement of the hyoid bone and the epiglottis during swallowing were different according to etiology of dysphagia, and swallowing motion analysis could be applied to differentiate the mechanism of dysphagia.
Paik
Nam-Jong
NJ
Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 300 Gumi-dong Bundang-gu, Seongnam 463-707, Republic of Korea. njpaik@snu.ac.kr
Kim
Sang Jun
SJ
Lee
Ho Jun
HJ
Jeon
Jae Yong
JY
Lim
Jae-Young
JY
Han
Tai Ryoon
TR
D000368:Aged; D003679:Deglutition / Q000502:physiology*; D003680:Deglutition Disorders / Q000209:etiology / Q000503:physiopathology*; D004825:Epiglottis / Q000503:physiopathology*; D005260:Female; D005471:Fluoroscopy; D006801:Humans; D006928:Hyoid Bone / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009068:Movement; D009135:Muscular Diseases / Q000150:complications; D053120:Respiratory Aspiration / Q000503:physiopathology; D020521:Stroke / Q000150:complications; D014741:Video Recording