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[General indications of middle-ear implants].

Middle ear implants are indicated in bilateral neurosensorial hearing loss in the following situations: bilateral neurosensorial hearing loss with maximal thresholds of air conduction or air conduction within an established range. The differential threshold in frequencies of 500, 1,000, 2,000 and 4,000 Hz should not be above 10 dB in two or more of these frequencies. Minimal speech recognition must be 50% or more. Middle ear function and anatomy must be normal and there must be no evidence that hearing loss is of retrocochlear origin. Use of a hearing aid for at least 6 months in the ear receiving the implant must be proven to be unsatisfactory by a hearing test. Expectations must be realistic and vestibular alterations must be excluded.