Combined Sonotubometry And Imageology Study Of Opening Of Eustachian Tube In Normal Subjects

Objectives:The Eustachian tube(ET)is the only organ that normally connects the nasopharynx to the middle ear.This study aims to study the function and morphology of normal human eustachian tube by using sonotubometry and imageology,evaluate the eustachian tube in combination.The next step of this study will be to study the function and morphology of eustachian tube in patients with ETD by Sonotubometry and imageology.Methods:This study was divided into two parts: Sonotubometry and imageology.Part of the experiment of imageology was performed after partial experiment of Sonotubometry.Choose 13 healthy volunteers(26 ears),before the experiment,the subject was trained to swallow,toynbee,and valsalva.After the subject is determined to be proficient in three actions,the acoustic test is started.Let the subjects perform three actions: swallowing,toynbee,and valsalva(holding for 10 seconds).Each movement is divided into two positions: standing position and supine position.The acoustic waves collected from the external auditory canal were recorded by instrument CHN-16.The duration of the eustachian tube opening and the maximum sound pressure were measured.Next,the eustachian tube imageology experiment was carried out.The CT scanparameters of the Eustachian tube were set to parameter 1 and parameter 2,static scanning and valsalva scanning with one line of parameters,valsalva scanning with two rows of parameters,and MPR reconstruction with CT scanning images.The bone area and cartilage area of eustachian tube were measured respectively.Results:The open rate of the eustachian tube standing position was statistically significant compared with the open rate of swallowing and toynbee(P<0.05).The open rate of the eustachian tube supine position was statistically significant compared with the open rate of swallowing and toynbee(P<0.05).The duration of the opening of the eustachian tube measured under the condition of valsalva was longer than the duration of the opening of the eustachian tube in the supine position of the supine position,and the difference was statistically significant(P<0.05).the duration of eustachian tube opening in standing position was longer than that in supine position(P < 0.05).In standing position or supine position,the opening time of eustachian tube measured by valsalva is longer than that measured by the other two movements.The maximum sound pressure of eustachian tube opening was also higher than that of the other two movements,and the difference was statistically significant(P <0.05).The scanning time of the two groups of parameters: the scanning time of the second parameter is longer than the scanning time of the parameter one,and the difference is between the two groups.It was statistically significant(P <0.05).The area of cartilage measured under valsalva was larger than that measured under static state,and the difference was statistically significant(P <0.05).Comparison between the scanning parameters of the two groups: the area of cartilage measured by parameter one scan was larger than that measured by parameter two scan,and the difference was statistically significant(P < 0.05).Conclusion:1.The passive opening of eustachian tube may be affected byposture,and standing position may be more beneficial to the opening of eustachian tube.Valsalva can not keep eustachian tube open.2.Compared with slow CT scan,fast CT scan is easier to scan CT images when eustachian tube is open.3.Combined with valsalva combined with sonography and imaging,it can be used as an evaluation method of eustachian tube.It is expected to be used to evaluate the eustachian tube before and after BET in patients with ETD.