Acoustic characteristics of voluntary expiratory sounds after swallow for detecting dysphagia
Autor: | M. I. Yamashita, Yuka Nakamichi, Koji Takahashi, N. Furuya, Yoshiaki Ihara, Michael E. Groher, Kaoru Yokoyama, Yoshiko Takei |
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Rok vydání: | 2014 |
Předmět: |
Male
medicine.medical_specialty Octave band Barium Compounds Video Recording Audiology Swallowing otorhinolaryngologic diseases medicine Humans General Dentistry Aged Decibel Aged 80 and over business.industry digestive oral and skin physiology Middle Aged Dysphagia Deglutition Sound Exhalation Fluoroscopy Female Barium swallows medicine.symptom Deglutition Disorders business |
Zdroj: | Journal of Oral Rehabilitation. 41:667-674 |
ISSN: | 0305-182X |
DOI: | 10.1111/joor.12184 |
Popis: | Summary This research was designed to investigate the acoustic characteristics of voluntary expiratory sounds after swallow for detecting dysphagia. Forty-nine patients with complaints of swallow difficulty received a videofluorographic (VF) examination. They were divided into three groups: nine who did not have any apparent disease (Group N), 22 patients with head and neck cancer (Group H&N) and 18 patients with other diseases including cerebrovascular disease (Group OD). After liquid barium swallows, they exhaled voluntarily without voicing. Videofluorographic findings were classified into four groups: normal (Normal), acceptable swallow (Acceptable), swallow with residue (Resid) and swallows with penetration or aspiration (Pen/Asp). The duration of expiratory sounds was measured on the time waveform. Frequency characteristics of expiratory sounds were obtained using one-third octave band analysis ranging from 62·5 to 2000·0 Hz of central frequency. The averaged level of the 1000·0-Hz band was chosen as the reference band level (RB level). The revised averaged level of each band was obtained by subtracting the RB level from the averaged level of each band. Zero decibel of the revised magnitude of the 125·0-Hz band was set as the critical value to differentiate dysphagia (Resid or Pen/Asp) from no dysphagia (Normal or Acceptable). Comparison of this assessment with VF findings showed a significant percentage agreement (85·4%). These results suggest that frequency characteristics of post-swallow expiratory sounds can differentiate dysphagia from no dysphagia among multiple dysphagic patient groups. |
Databáze: | OpenAIRE |
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