RESULTS Theapoptosis index were 12.07 ± 0.21, 5.19 ± 0.36 and0.32 ± 0.48, and the label index of PCNA( P-LI) was23.66 ± 1.78, 38.19 ± 1.95 and 67.50 ± 1.33 in tis-sues of laryngeal carcinoma, larygneal atypical hyper-plasia and vocal cord polyp respectively.
Results showed that the positive rate of HPV DNA was 60 0%(6/10) in pharyngeal papilloma,20 0%(1/5) in atypical epithelial hyperplasia,20 0%(3/5) in vocal cords polyps,20 0%(1/5) in laryngeal carcinoma and 0 0%(0/10) in vocal cords nodule. The total positive rate of HPV DNA was 32 7%(18/55) in 55 specimens.
In etiology, the malignant tumors of larynx and related structures were found in 142 cases (40. 6 % ), vocal paralysis in 58 cases (16. 6% ) and the benign lesions in vocal cords in 53 cases (15. 2% ).
A practical application of linear prediction methods for calculating the pulse function that models the functioning of vocal cords is described.
Laryngeal endoscopy showed that 10 of the patients had intermittent partial obstruction of the glottis, due to repetitive abnormal adduction of the vocal cords.
Vocal cord dysfunction (VCD) is a nonorganic disorder of the larynx that involves unintentional paradoxical adduction of the vocal cords while breathing.
If immediate postoperative evaluation showed mobility of the vocal cords but a paralysis was detected later by an otolaryngologist and repeat intervention was not done, vocal cord function was spontaneously restored in 9 of 11 patients.
Postoperatively there were pathological findings of vocal cords in 13 patients (6.2 %).
Proposed was a method of smoothing the spectrum of vocal signal which is based on the histogram analysis of the peaks of the spectral envelope and represents a variety of the frequency analysis that is synchronous with the main tone.
Its application was demonstrated by way of examples of the real vocal signals.
Correction of the vocal signal distorted by additive noise
Proposed was a method of vocal signal correction by processing its short-period amplitude logarithmic spectrum, which makes it possible to reduce the additive noise component.
The results of applying it to concrete vocal signals were presented.
Vocal fold geometry plays an important role in human phonation.
Vocal Fold Dysfunction is a syndrome characterized by abnormal adduction of the focal folds during inspiration and is the cause of a wide spectrum of clinical manifestations ranging from mild inspiratory stridor to an inability to move any air.
Distinguishing Vocal Fold Dysfunction from Refractory Asthma is important to avoid unnecessary pharmacotherapy and intubation.
The diagnosis of Vocal Fold Dysfunction can only be made with certainty by flexible fiberoptic laryngoscopy while the patient is symptomatic.
Most patients with the condition can be managed by speech therapy and the use of breathing strategies that eliminate the abnormal vocal fold movement.