Is the Bone-Conduction Headband Test Useful for Predicting the Functional Outcome of a Round Window Active Middle Ear Implant?

Abstract

To estimate the reliability of the Bone Conduction-HeadBand (BC-HB) test for predicting the postoperative functional outcome of a round-window (RW) vibroplasty. Within-subject comparison of the functional results of the BC-HB test, which is routinely used for the preoperative evaluation of a bone-conduction transducer, with an active middle ear implant (AMEI) placed onto the round window. Tertiary referral university hospital center. Seven patients with similar anatomic (absent stapes superstructure) and functional (moderate, mixed hearing loss) sequelae from open tympanoplasty technique. All subjects underwent preoperative audiologic assessment with the BC-HB. Subsequently, all subjects underwent surgical placement of an AMEI onto the round window. Pure tone and speech audiometry in quiet and noise were assessed. Additionally, evaluation of specific satisfactory targets was performed using the Client Oriented Scale of Improvement. Pure tone and speech audiometry in quiet established that both devices had very similar performance and provided remarkable improvement compared with the unaided condition. However, high-frequency gain and speech audiometry in noise demonstrated better performance with RW-AMEI. In patients presenting with mixed hearing loss as a sequela from middle ear surgery, the preoperative BC-HB test may be helpful in predicting the final functional outcome and patient satisfaction with RW-AMEI.