Dysphagia

, Volume 22, Issue 1, pp 1–10

Effects of Surface Electrical Stimulation Both at Rest and During Swallowing in Chronic Pharyngeal Dysphagia

  • Christy L. Ludlow
  • Ianessa Humbert
  • Keith Saxon
  • Christopher Poletto
  • Barbara Sonies
  • Lisa Crujido
Article

Abstract

We tested two hypotheses using surface electrical stimulation in chronic pharyngeal dysphagia: that stimulation (1) lowered the hyoid bone and/or larynx when applied at rest, and (2) increased aspiration, penetration, or pharyngeal pooling during swallowing. Bipolar surface electrodes were placed on the skin overlying the submandibular and laryngeal regions. Maximum tolerated levels of stimulation were applied while patients held their mouth closed at rest. Videofluoroscopic recordings were used to measure hyoid movements in the superior-inferior and anterior-posterior dimensions and the subglottic air column position while stimulation was on or off. Patients swallowed 5 ml liquid when stimulation was off, at low sensory stimulation levels, and at maximum tolerated levels (motor). Speech pathologists, blinded to condition, tallied the frequency of aspiration, penetration, pooling, and esophageal entry from videofluorographic recordings of swallows. Only significant (p = 0.0175) hyoid depression occurred during stimulation at rest. Aspiration and pooling were significantly reduced only with low sensory threshold levels of stimulation (p = 0.025) and not during maximum levels of surface electrical stimulation. Those patients who had reduced aspiration and penetration during swallowing with stimulation had greater hyoid depression during stimulation at rest (p = 0.006). Stimulation may have acted to resist patients’ hyoid elevation during swallowing.

Keywords

Deglutition Deglutition disorders Hyolaryngeal movement Aspiration Penetration Sensory stimulation Resistance Transcutaneous neuromuscular stimulation 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Christy L. Ludlow
    • 1
    • 5
  • Ianessa Humbert
    • 2
  • Keith Saxon
    • 1
  • Christopher Poletto
    • 1
  • Barbara Sonies
    • 3
  • Lisa Crujido
    • 4
  1. 1.Laryngeal and Speech SectionNational Institute of Neurological Disorders and StrokeBethesdaMaryland
  2. 2.Departments of Medicine and Radiology, Geriatric Research Education and Clinical Center (GRECC)University of Wisconsin-Madison, Wm. S. Middleton Veterans HospitalMadisonWisconsin
  3. 3.Department of Rehabilitation of the Clinical CenterNational Institutes of HealthBethesdaMaryland
  4. 4.Department of Speech and Hearing ScienceArizona State UniversityTempeUSA
  5. 5.BethesdaUSA

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