Fields M J, Allison R S, Corwin P, White P S, Doherty J
Department of Otolaryngology, Head and Neck Surgery, Christchurch Hospital.
N Z Med J. 1993 Sep 8;106(963):386-7.
To determine the accuracy of a hand-held microtympanometer (Microtymp, Welch Allyn) used by a general practitioner when compared with findings at myringotomy.
Independent preoperative assessment of children's ears using microtympanometry by a general practitioner, microscopy and pneumatic otoscopy by a specialist otologist and impedance bridge tympanometry by a specialist audiologist were performed and compared with findings at myringotomy.
Fifty children (100 ears) on the waiting list for bilateral myringotomies and ventilation tube insertion for recurrent acute otitis media or otitis media with effusion.
Microscopy with pneumatic otoscopy had a 90.9% sensitivity and a 92.9% specificity in detecting middle ear effusions. Impedance bridge tympanometry had a 94.4% sensitivity and a 71.8% specificity if type B and C2 were combined to predict middle ear effusion. Microtympanometry had 100% sensitivity and 75% specificity if type B and C tympanograms were combined; if type B tympanograms alone were used, a sensitivity of 83.4% and specificity of 75% in predicting middle ear effusions was obtained.
The Microtypm is a useful instrument in general practice for assessment of middle ear effusions as no ears with fluid were missed in this study if type B and C tympanograms were considered abnormal. The Microtymp would also be useful as a screening instrument by suitably trained personnel.
将全科医生使用的手持式微鼓室计（Microtymp，Welch Allyn）与鼓膜切开术的检查结果进行比较，以确定其准确性。
由全科医生使用微鼓室计对儿童耳朵进行独立的术前评估，由专科耳科医生进行显微镜检查和气耳镜检查，由专科听力学家进行阻抗桥鼓室图检查，并与鼓膜切开术的检查结果进行比较。
五十名等待双侧鼓膜切开术及插入通气管以治疗复发性急性中耳炎或中耳积液的儿童（100只耳朵）。
气耳镜显微镜检查在检测中耳积液方面的灵敏度为90.9%，特异度为92.9%。如果将B型和C2型合并以预测中耳积液，阻抗桥鼓室图检查的灵敏度为94.4%，特异度为71.8%。如果将B型和C型鼓室图合并，微鼓室计检查的灵敏度为100%，特异度为75%；如果仅使用B型鼓室图，在预测中耳积液方面的灵敏度为83.4%，特异度为75%。
在全科医疗中，微鼓室计是评估中耳积液的一种有用工具，因为在本研究中，如果将B型和C型鼓室图视为异常，则没有漏诊有积液的耳朵。经过适当培训的人员使用微鼓室计作为筛查工具也会很有用。
