Study of Phonation in the Excised Canine Larynx
| Autor: | Thomas V. McCaffrey, Eriko Yanagi, David H. Slavit |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Larynx
In Vitro Techniques Balloon Speech Acoustics 03 medical and health sciences Dogs 0302 clinical medicine Phonation Pressure otorhinolaryngologic diseases Canine larynx Animals Medicine Thyroarytenoid muscle 030223 otorhinolaryngology business.industry Anatomy respiratory system Sound intensity Electrophysiology Sound medicine.anatomical_structure Otorhinolaryngology 030220 oncology & carcinogenesis Laryngeal Muscle Vocal folds Regression Analysis Surgery Laryngeal Muscles Vocalization Animal Pulmonary Ventilation business |
| Zdroj: | Otolaryngology–Head and Neck Surgery. 105:586-595 |
| ISSN: | 1097-6817 0194-5998 |
| DOI: | 10.1177/019459989110500410 |
| Popis: | Previous studies have demonstrated that the laryngeal muscles responsible for pitch variation and vocal efficiency are the cricothyroid muscles, affecting longitudinal tension of the vocal folds, and the thyroarytenoid muscles, controlling the lateral stiffness of the vocal folds. Longitudinal tension in the vocal fold is easily simulated in the excised canine larynx. The effect of the thyroarytenoid muscle, however, has not been adequately analyzed. To simulate the effect of the thyroarytenoid muscle, small balloons were placed in the paraglottic space at the level of the vocal folds in 10 excised canine larynges. These balloons (Fogarty catheters) could be inflated in increments to simulate the effect of the thyroarytenoid muscle contraction in altering the lateral stiffness of the vocal fold. During phonation subglottic pressure, vocal fold longitudinal tension and balloon size were systematically varied. The photoglottographic and electroglottographic signals, sound intensity, and airflow rate were measured. Multiple regression analysis showed that sound intensity was directly related to subglottic pressure (p less than 0.001) and inversely related to balloon size (p less than 0.001). Vocal efficiency was directly related to subglottic pressure (p less than 0.001). Frequency of vibration was directly related to balloon size (p less than 0.05), vocal fold tension (p less than 0.001), and subglottic pressure (p less than 0.001). Open quotient was directly related to vocal fold tension (p less than 0.01) and inversely related to balloon size (p less than 0.001). Clinical implications of these results will be discussed. |
| Databáze: | OpenAIRE |
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