Abstract
Transtympanic electrocochleograms were evaluated in 24 patients. Action potential (AP), summating potential (SP), SP/AP ratio and SP polarity wererecorded with a needle electrode at positions both near the round window niche and near the stapes.
AP amplitudes recorded near the round window niche tended to be higher than those recorded near the stapes. The SP/AP ratio was stable at both positions. Positive SPs were recorded in 11 patients only near the round window niche.
SP polarities were influenced by the position at which electrodes were inserted.
