The Study And Clinical Application Of Wideband Absorbance In Children

Objective:To check normative data for wideband absorbance measurements in children with normal ear,effusion ear and negative pressure ears using wideband acoustic immittance(WAI)and determine the WBA curves of normal ears to facilitate the use of it.To discuss the using of wideband acoustic immittance in children middle ears function.To analysis the effects of genders on wideband absorbance.To provide reference value for clinical practice.Method:One hundred and forty-nine patients(296ears),from August 2018 to January 2019,were enrolled,including 76 males and 73 females whose ages ranged from 2 to 14 years.All of these patients,who underwent physical examination,ear endoscopy,conventional tympanometry and pure tone audiometry,were divided into three groups,namely normal,negative pressure and effusion according to the clinical diagnosis.To check normative data for wideband acoustic immittance in children with normal ear.The absorbance diagram of normal,effusion and negative pressure ears were mapped in children.The normal WBA curve was named as type N(normal)curve,the middle ear effusion curve as type E(effusion)curve,and the middle ear negative pressure curve as type P(negative pressure)curve.Pairwise comparison was carried out to analyzethe difference of the WBA among these WBA curves.To discuss the using of wideband acoustic immittance in children middle ears function and to provide reference value for clinical practice.To analysis the effects of genders on wideband absorbance.Result:1?The wideband absorbance at all 31 frequencies among type N curve,type E curve and type P curve showed statistically significant differences(p<0.05).2?The wideband absorbance at all 31 frequencies between type N curve and type E curve showed statistically significant differences(p<0.05);Except for 5039Hz?5656Hz?7127Hz?8000Hz(p>0.05,p>0.05,p>0.05,p>0.05),there were significant differences in WBA at others 27 frequencies between type N curve and type P curve(p<0.05);Except for 226Hz?280Hz?324Hz?363Hz?385Hz?432Hz?500HZ?561Hz?2828Hz(p>0.05,p>0.05,p>0.05,p>0.05,p>0.05,p>0.05,p>0.05,p>0.05,p>0.05),there were significant differences in WBA at others 21 frequencies between type E curve and type P curve(p<0.05).3?The type N curve presented as “U” shape,WBA was increased with increasing frequency,and was highest at 2244 Hz,then WBA was decreased with increasing frequency,and was lowest at 6349 Hz,while WBA was increased with increasing frequency again.4?The type E curve presented as “?” shape,WBA was increased with increasing frequency,and was highest at 2519 Hz,then WBA was decreased with increasing frequency,and was lowest at 6349 Hz,while WBA was increased with increasing frequency again.5?The type E curve presented as “M” shape,WBA was increasedwith increasing frequency,and was highest at 2244 Hz,then WBA was decreased with increasing frequency,and was lowest at 4000 Hz,then WBA was increased with increasing frequency again,and was highest at7127 Hz,last WBA was decreased with increasing frequency,this is different from others.6?In type N curve,WBA of male children group was higher than female children group in 226Hz?707Hz?793Hz?890Hz,(p<0.05),other frequencies showed no statisticaly significant difference.Conclusion:1?Different frequency has different wideband absorbance in children with normal ear.2?The wideband absorbance in children with effusion ear is lower than normal ear and negative pressure ears.3?The wideband absorbance is decreased with increasing pressure of middle ears.4?Genders has effects on wideband absorbance.