[Intraoperative monitoring with transtympanic electrocochleography]

Transtympanic electrocochleography (ECoG) enables auditory evoked potentials to be recorded directly from the peripheral organ, and ECoG recordings can be used as a routine during operations. Examples of cochlear and eighth nerve monitoring in middle ear, inner ear, and cerebellopontine angle surgery are given. This monitoring tool provides a continuous feedback to the surgeon of the effects of the operation on the cochlea and the auditory pathway.