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The Mendelsohn Maneuver and its Effects on Swallowing: Kinematic Analysis in Three Dimensions Using Dynamic Area Detector CT

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Abstract

This study investigated the effects of Mendelsohn maneuver with three-dimensional kinematic analysis. Nine female speech-language pathologists (nine females, mean ± SD 27.1 ± 3.5 years old) underwent 320-row area detector scan during swallows of 4-ml nectar-thick liquid using with no maneuvers (control) and with Mendelsohn maneuver (MM). Critical event timing (hyoid, soft palate, epiglottis, laryngeal vestibule, true vocal cords (TVC), UES), hyoid and laryngeal excursion, cross-sectional area of UES, and volume of pharyngeal cavity and bolus were measured and compared between two swallows. In MM, all the events were significantly prolonged with delayed termination time (p < 0.05) except UES opening. The onset, termination, and duration of UES opening were not significantly affected by MM nor was timing of bolus transport. The hyoid bone was positioned significantly higher at maximum displacement (p = 0.011). Pharyngeal constriction ratio was 95.1% in control and 100% of all subjects in MM. Duration of minimum pharyngeal volume was significantly longer in MM than in control (p = 0.007). The MM produces several distinct changes in the kinematics of swallowing in healthy subjects with no dysphagia. The changes in the timing and magnitude of hyoid displacements and prolonged closure of the pharynx during swallowing suggest the utility of MM for improving the safety and efficiency of swallowing in selected cases.

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Acknowledgements

The authors sincerely appreciate the members of the department of Radiology, Fujita Health University, for their assistance and suggestions.

Funding

This research was partially supported by JSPS KAKENHI (No. 25750236).

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Authors and Affiliations

  1. Faculty of Rehabilitation, School of Health Sciences, Fujita Health University, 1-98 Dengakugakubo, Kutsukake, Toyoake, Aichi, 470-1192, Japan

    Yoko Inamoto

  2. Department of Rehabilitation Medicine I, School of Medicine, Fujita Health University, Toyoake, Japan

    Yoko Inamoto, Eiichi Saitoh, Yuriko Ito, Hitoshi Kagaya, Yoichiro Aoyagi, Seiko Shibata & Kikuo Ota

  3. Department of Radiology, School of Medicine, Fujita Health University, Toyoake, Japan

    Naoko Fujii

  4. Department of Physical Medicine and Rehabilitation, Johns Hopkins University, Baltimore, USA

    Jeffrey B. Palmer

Authors
  1. Yoko Inamoto
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  2. Eiichi Saitoh
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  3. Yuriko Ito
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  4. Hitoshi Kagaya
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  8. Naoko Fujii
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  9. Jeffrey B. Palmer
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Correspondence to Yoko Inamoto.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Inamoto, Y., Saitoh, E., Ito, Y. et al. The Mendelsohn Maneuver and its Effects on Swallowing: Kinematic Analysis in Three Dimensions Using Dynamic Area Detector CT. Dysphagia 33, 419–430 (2018). https://doi.org/10.1007/s00455-017-9870-7

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  • DOI: https://doi.org/10.1007/s00455-017-9870-7

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