Research Of The Changes Of Acoustic Parameters When The False Vocal Cords In A Different Position

Objective:Advance the graduation of the false vocal cords Application. Using XION voice analysis software do the acoustic sound testing to the false vocal cords in a different position to explore the relationship of the false vocal cords in a different position and voice.Using XION voice analysis software to explore the changes of acoustic parameters when the false vocal cords in a different position.Methods:we choose 100 cases of false vocal cords diseases at the Second Hospital of Tianjin Medical University ENT department from the February 2009 to December 2010. The 100 cases include 20 cases in a normal position,20 cases inⅠ-abduced positon,20 cases inⅡ-abduced positon,20 cases inⅠ-adducted positon;20 cases inⅡ-adducted positon. Using Germany XION electronics laryngoscope and voice acoustic detection equipment get patients'electronic video and voice acoustic Parameters of these 100 patients. By XION electronics laryngoscope, we determined the location of false vocal cords.After we have the voice fatigue test and Dysphonia Severity Index test. Voice fatigue test have two parameters measured in error rate of low and high sound pressure level.we can compare the error rate of sound pressure level in the same location between men and women and the error rate of sound pressure level in different locations. In the Dysphonia Severity Index test,we can obtain the highest fundamental frequency, the minimum volume, the Maximum Phonation Time, Jitter and DSI.So we compare these parameters in the same location between men and women and in different locations.Results:Voice fatigue test:①ender comparison:Comparing the error rate of sound pressure level between males and females of the false vocal cords inⅡ-abduced position were not statistically significant (P>0.05). Comparing the error rate of sound pressure level between males and females of the false vocal cords inⅠ-abduced position were not statistically significant (P>0.05). Comparing the error rate of low sound pressure level between males and females of the false vocal cords in normal position were statistically significant (P<0.05); Comparing the error rate of high sound pressure level between males and females of the false vocal cords in normal position were not statistically significant (P>0.05). Comparing the error rate of sound pressure level between males and females of the false vocal cords inⅠ-adducted position were not statistically significant (P>0.05). Comparing the error rate of low sound pressure level between males and females of the false vocal cords in normal position were not statistically significant (P>0.05); Comparing the error rate of high sound pressure level between males and females of the false vocal cords inⅡ-adducted position were statistically significant (P<0.05).②Comparison the same parameter between different locations:Men with low sound pressure levels of every group:P<0.05. Men with high sound pressure levels between the groups of the false vocal cords inⅠ-abduced andⅡ-abduced positon were not statistically significant (P>0.05),Other positons were statistically significant (P<0.05).Women with low sound pressure levels between the groups of the false vocal cords inⅠ-abduced andⅡ-abduced positon were not statistically significant (P>0.05); Women with low sound pressure levels between the groups of the false vocal cords inⅠ-adducted andⅡ-adducted positon were not statistically significant (P>0.05);Other positons were statistically significant (P<0.05). Women with high sound pressure levels between the groups of the false vocal cords inⅠ-adducted andⅡ-abduced positon were not statistically significant (P>0.05);Other positons were statistically significant (P<0.05)DSI test:①Gender comparison:F0max, SPLmin,MPT and Jitter of the false vocal cords inⅡ-abduced position were not statistically significant (P>0.05), DSI was statistically significant (P<0.05). F0max, SPLmin,MPT, Jitter and DSI of the false vocal cords inⅠ-abduced position were not statistically significant (P>0.05). F0max, SPLmin,MPT, Jitter and DSI of the false vocal cords in the normal position were not statistically significant (P>0.05). F0max, SPLmin,MPT, Jitter and DSI of the false vocal cords inⅠ-adducted position were not statistically significant (P>0.05) F0max, SPLmin, Jitter and DSI of the false vocal cords inⅡ-adducted position were not statistically significant (P>0.05), MPT was statistically significant (P 0.05).②Comparison the same parameter between different locations:Men and women of DSI in every positon was statistically significant (P<0.05). Men of F0max between the groups of the false vocal cords inⅡ-abduced positonⅠ-adducted positon were not statistically significant (P>0.05),Other positons were statistically significant (P<0.05). Women of F0max between the groups of the false vocal cords inⅡ-abduced positonⅠ-adducted positon were not statistically significant(P>0.05), Other positons were statistically significant (P<0.05). Men and women of SPLmin in every positon were not statistically significant (P>0.05). Men and women of MPT in every positon were statistically significant (P<0.05).Men of Jitter between the groups of the false vocal cords inⅡ-abduced positonⅠ-abduced positon were not statistically significant (P>0.05), Other positons were statistically significant (P <0.05).Women of Jitter between the groups of the false vocal cords inⅡ-abduced positonⅠ-abduced positon were not statistically significant (P>0.05). Women of Jitter between the groups of the false vocal cords inⅡ-abduced positonⅠ-adduced positon were not statistically significant (P>0.05), Other positons were statistically significant (P<0.05)Conclusion:①he false vocal cords involved in the process of pronunciation.②hen the false vocal cords are in the normal position, the sound level of fatigue and Dysphonia Severity Index are in the lowest level. When the false vocal cords are in the abnormal position, the sound level of fatigue and Dysphonia Severity Index are increased. Increase with the degree of deviation from the normal position, sound fatigue degree and DSI increased.③The false vocal cords in adducted positon is different form in the aspect of the impact of sound. The false vocal cords in adducted positon in the aspect of the impact of sound is higher than the abduced positon.Ⅱ-adduced positon have the greatest impact on the pronunciation.④Voice fatigue test and Dysphonia Severity Index test can be used as an objective evaluation to analyse the acoustic parameter.