| Project/Area Number |
17592092
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Surgical dentistry
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| Research Institution | Nagasaki University |
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Principal Investigator |
ISHITOBI Shingo Nagasaki University, Hospital of Medicine and Dentistry, Assistant Professor (60363454)
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| Co-Investigator(Kenkyū-buntansha) |
AYUSE Takao Nagasaki University, Graduate School of Biomedical sciences, Associate Professor (20222705)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,840,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥240,000)
Fiscal Year 2007: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | analyzing swallowing sounds / diagnosis of the aspiration / videofluorography / videoendoscapic examination of swallowing / 誤嚥 / 声門閉鎖 / 嚥下音 |
|---|
| Research Abstract |
An analysis of swallowing sounds using the swallowing sounds of healthy subjects as samples has verified that swallowing sounds comprise complex elements, but normally consist of three major elements. The related mechanisms were further studied by the use of an electromyogram and the measurement of the swallowing pressure.
Regarding the examination of aspiration using swallowing sounds, it is difficult to obtain the sounds of objects passing through the windpipe generated during the act of swallowing, and we discovered that it is also difficult to examine cases of aspiration using only swallowing sounds.
Therefore, we studied a method for determining intralaryngeal invasion and the occurrence of aspiration in minute amounts by analyzing the frequency of moist expiratory sounds during aspiration and then analyzing changes in vocal cord vibration. We focused particularly on changes in vocal cord vibration during phonation and attempted to detect minor supraglottic changes by analyzing the formant and basic frequency of the sound spectrogram. We discovered that a consistent change occurred in the formant waves in association with occurrences of aspiration and intralaryngeal invasion, thereby indicating the effectiveness of these analyses for future determinations of aspiration.
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