Babonis T R, Weir M R, Kelly P C
Department of Pediatrics, Madigan Army Medical Center, Tacoma, Washington.
Pediatrics. 1991 Apr;87(4):475-80.
A total of 220 ears undergoing myringotomy and pressure-equalizing tube placement were studied with impedance tympanometry and acoustic reflectometry in a direct comparison for detection of middle-ear effusion. Impedance tympanometry and acoustic reflectometry were equally accurate, detecting the presence or absence of middle-ear effusion in 73% and 72% of ears, respectively. The presence of effusion in ears with tympanographic patterns other than type A and type B was not consistently and reliably predicted. The higher sensitivity of impedance tympanometry (90%) compared with that for acoustic reflectometry (58%) contrasted with the opposite findings for specificities (54% vs 88%). It is concluded that impedance tympanometry and acoustic reflectometry measure different events at the tympanic membrane and their utility lies in the fact that they complement each other. These instruments can aid the experienced otoscopist in confirming a clinical impression and assist the less experienced clinician in validating or improving otoscopic skills.
对220例接受鼓膜切开术并放置通气管的耳朵进行了阻抗鼓室图和声反射测量研究，以直接比较检测中耳积液的情况。阻抗鼓室图和声反射测量的准确性相同，分别在73%和72%的耳朵中检测到中耳积液的存在与否。对于除A型和B型以外鼓室图模式的耳朵，积液的存在情况无法始终如一地可靠预测。与声反射测量（58%）相比，阻抗鼓室图的敏感性更高（90%），而特异性则相反（54%对88%）。结论是，阻抗鼓室图和声反射测量在鼓膜处测量不同的事件，它们的作用在于相互补充。这些仪器可以帮助有经验的耳镜检查者确认临床印象，并帮助经验较少的临床医生验证或提高耳镜检查技能。
