耳小骨連鎖異常の臨床的検討

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  • Clinical Evaluation of Ossicular Abnormalities

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Preoperative diagnoses, operative findings and postoperative results are discussed for 45 ears of 43 patients suffering from ossicular abnormalities with intact tympanic membrane. The ossicular abnormalities in this study included 35 ears with congenital anomalies and 10 ears with traumatic ossicular dislocation. Reconstruction of the ossicular chain was fully successful for patients with traumatic disruption and surgical results were satisfactory. In the cases of congenital anomalies, the degree of hearing gain following reconstruction of the ossicular chain depended on the type of ossicular abnormality. The "disruptive type" of case showed successful surgical results more often than the "fixed type" of case. However, preoperative examination including an audiogram, impedance audiometry and a high resolution CT, was not able to be fully differentiate between the “di sruptive type” and “fixed type”.

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