The effect of bolus viscosity on laryngeal closure in swallowing: Kinematic analysis using 320-row area detector CT

Yoko Inamoto, Eiichi Saito, Sumiko Okada, Hitoshi Kagaya, Seiko Shibata, Kikuo Ota, Mikoto Baba, Naoko Fujii, Kazuhiro Katada, Pattra Wattanapan, Jeffrey B. Palmer

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The present study examined the effect of bolus viscosity on the onset of laryngeal closure (relative to hyoid elevation), the duration of laryngeal closure, and other key events of swallowing in ten healthy volunteers. All volunteers underwent 320-row area detector computed tomography swallow studies while swallowing 10 ml of honey-thick barium (5 % v/w) and thin barium (5 % v/w) in a 45 reclining position. Three-dimensional images of both consistencies were created in 29 phases at an interval of 0.10 s (100 ms) over a 2.90-s duration. The timing of the motions of the hyoid bone, soft palate, and epiglottis; the opening and closing of the laryngeal vestibule, true vocal cords (TVC), and pharyngoesophageal segment; and the bolus movement were measured and compared between the two consistencies. The result showed differing patterns of bolus movement for thin and thick liquids. With thin liquids, the bolus reached the hypopharynx earlier and stayed in the hypopharynx longer than with thick liquids. Among events of laryngeal closure, only the timing of TVC closure differed significantly between the two consistencies. With thin liquids, TVC closure started earlier and lasted longer than with thick liquids. This TVC movement could reflect a response to the faster flow of thin liquids. The results suggest that bolus viscosity alters the temporal characteristics of swallowing, especially closure of the TVC.

Original languageEnglish
Pages (from-to)33-42
Number of pages10
JournalDysphagia
Volume28
Issue number1
DOIs
Publication statusPublished - 01-03-2013

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Vocal Cords
Deglutition
Biomechanical Phenomena
Viscosity
Hypopharynx
Barium
Hyoid Bone
Epiglottis
Soft Palate
Honey
Three-Dimensional Imaging
Volunteers
Healthy Volunteers
Tomography

All Science Journal Classification (ASJC) codes

  • Otorhinolaryngology
  • Gastroenterology
  • Speech and Hearing

Cite this

Inamoto, Yoko ; Saito, Eiichi ; Okada, Sumiko ; Kagaya, Hitoshi ; Shibata, Seiko ; Ota, Kikuo ; Baba, Mikoto ; Fujii, Naoko ; Katada, Kazuhiro ; Wattanapan, Pattra ; Palmer, Jeffrey B. / The effect of bolus viscosity on laryngeal closure in swallowing : Kinematic analysis using 320-row area detector CT. In: Dysphagia. 2013 ; Vol. 28, No. 1. pp. 33-42.
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The effect of bolus viscosity on laryngeal closure in swallowing : Kinematic analysis using 320-row area detector CT. / Inamoto, Yoko; Saito, Eiichi; Okada, Sumiko; Kagaya, Hitoshi; Shibata, Seiko; Ota, Kikuo; Baba, Mikoto; Fujii, Naoko; Katada, Kazuhiro; Wattanapan, Pattra; Palmer, Jeffrey B.

In: Dysphagia, Vol. 28, No. 1, 01.03.2013, p. 33-42.

Research output: Contribution to journalArticle

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T1 - The effect of bolus viscosity on laryngeal closure in swallowing

T2 - Kinematic analysis using 320-row area detector CT

AU - Inamoto, Yoko

AU - Saito, Eiichi

AU - Okada, Sumiko

AU - Kagaya, Hitoshi

AU - Shibata, Seiko

AU - Ota, Kikuo

AU - Baba, Mikoto

AU - Fujii, Naoko

AU - Katada, Kazuhiro

AU - Wattanapan, Pattra

AU - Palmer, Jeffrey B.

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Y1 - 2013/3/1

N2 - The present study examined the effect of bolus viscosity on the onset of laryngeal closure (relative to hyoid elevation), the duration of laryngeal closure, and other key events of swallowing in ten healthy volunteers. All volunteers underwent 320-row area detector computed tomography swallow studies while swallowing 10 ml of honey-thick barium (5 % v/w) and thin barium (5 % v/w) in a 45 reclining position. Three-dimensional images of both consistencies were created in 29 phases at an interval of 0.10 s (100 ms) over a 2.90-s duration. The timing of the motions of the hyoid bone, soft palate, and epiglottis; the opening and closing of the laryngeal vestibule, true vocal cords (TVC), and pharyngoesophageal segment; and the bolus movement were measured and compared between the two consistencies. The result showed differing patterns of bolus movement for thin and thick liquids. With thin liquids, the bolus reached the hypopharynx earlier and stayed in the hypopharynx longer than with thick liquids. Among events of laryngeal closure, only the timing of TVC closure differed significantly between the two consistencies. With thin liquids, TVC closure started earlier and lasted longer than with thick liquids. This TVC movement could reflect a response to the faster flow of thin liquids. The results suggest that bolus viscosity alters the temporal characteristics of swallowing, especially closure of the TVC.

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