Abstract
Theoretically, there should be a close relationship between the vibratory pattern and acoustic output. The study aims at differentiating unilateral vocal cord paralysis (VCP) from normal subjects and also between right VCP and left VCP based on the acoustic analysis of the subjects voice. The study also aims at comprehensively investigating the phonatory disturbance resulting from VCP on the Indian population.
Results indicate that statistically significant differences were found among the following acoustic parameters: fluctuation per sec, in fimdamental frequency (fo), fluctuation per sec, in amplitude, extent of fluctuation in fo, extent of fluctuation in amplitude, jitter ratio, jitter factor, shimmer. Psigma and maximum phonation duration in differentiating unilateral VCP from normal subjects. Also the acoustic parameters: fluctuation per sec, info, extent of fluctuation in fo and Psigma could statistically differentiate between right VCP and left VCP. It can be concluded that the above parameters can be successfully used for diagnosing VCP and also the type of VCP. This is of particular significance in difficult to visualize patients and to monitor the therapeutic outcomes of vocal rehabilitation, following unilateral vocal cord paralysis. These results need to be further clinically validated by using a larger number of subjects.
Key Words: Unilateral recurrent laryngeal nerve paralysis, Right vocal cord paralysis, Left vocal cord paralysis, Acoustic parameters
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References
- 1.Berry M, Eisenson J. The Defective Speech. New York: F.S. Crofts & Co.; 1956. pp. 1950–1950. [Google Scholar]
- 2.Muller PB. Paralytic Dysphonia Folia Phonatrica. 1973;25:104–9. [PubMed] [Google Scholar]
- 3.Dedo HH. Injection & Removal of Teflon for Unilateral Vocal Cord Paralysis. Ann Otol Rhinol Laryngol. 1992;101:81–6. doi: 10.1177/000348949210100118. [DOI] [PubMed] [Google Scholar]
- 4.Von Leden H, Moore P. Vibratory pattern of the vocal cords in unilateral laryngeal paralysis. Acta Otolaryngologica Stock 1953:493–506. [DOI] [PubMed]
- 5.Benninger MS, Crumley RL, Ford CN, Gould WJ, Hanson DG, Ossoff RH, et al. Evaluation & treatment of the unilaterally paralyzed vocal fold. Otolaryngol Head Neck Surg. 1994;3:497–508. doi: 10.1177/019459989411100419. [DOI] [PubMed] [Google Scholar]
- 6.Ballenger JJ. Disease of the nose, throat, ear, head and neck. 13th edn. Philadelphia: Lea & Febiger; 1985. [Google Scholar]
- 7.Shipp T, McGlone R. Laryngeal dynamics associated with voice frequency change. J Speech Hearing Res. 1971;14:167–8. doi: 10.1044/jshr.1404.761. [DOI] [PubMed] [Google Scholar]
- 8.Arnold GE. Vocal Rehabilitation of Paralytic Dysphonia: II. Acoustic Analysis of Vocal Function. Arch Otolaryngol 1955:593–60. [DOI] [PubMed]
- 9.Sanderson RJ, Maran AG. The quantitative analysis of dysphonia. Clinical Otolaryngologica. 1992;17:440–3. doi: 10.1111/j.1365-2273.1992.tb01690.x. [DOI] [PubMed] [Google Scholar]
- 10.Bielamowicz S, Kreiman J, Gerratt BR, Dauer MS, Berke GS. Comparison of voice Analysis Systems for Perturbation Measurement. J Speech Hearing Res. 1996;39:126–34. doi: 10.1044/jshr.3901.126. [DOI] [PubMed] [Google Scholar]
- 11.Smith ME, Berke GS, Gerratt BR, Kreiman J. Laryngeal Paralysis: Theoretical Considerations and Effects on Laryngeal vibration. J Speech Hearing Res. 1992;35:545–54. [PubMed] [Google Scholar]
- 12.Murty GE, Carding PN. Combined glottographic measurement of vocal cord paralysis in the outpatient clinic. Clin Otolaryngologica. 1992;17:3–5. doi: 10.1111/j.1365-2273.1992.tb00977.x. [DOI] [PubMed] [Google Scholar]
- 13.Hanson DG, Gerratt BR, Ward PH. Glottographic measurement of vocal dysfunction Apreliminary Report. Ann Ottol Rhinol Laryngol. 1983;92:413–20. doi: 10.1177/000348948309200501. [DOI] [PubMed] [Google Scholar]