[Cochlear potentials and reduced blood supply]

In cats the mean arterial blood pressure (MABP) was reduced to 40 or 30 mm Hg by controlled hemorrhage. In 3 animals the cochlea action potentials (CAP) are not changed between 30 and 380 Min by 40 mm Hg MABP. In 4 animals we saw a latent or permanent decrease of CAP between 4 and 115 Min by 30 mm Hg MABP. A singular experiment shows, that a CAP-decrease is caused by injection of an acetylcholin blockade substance. We did not find a correlation to the length of time of the ischemia and a CAP decrease. We found an exact correlation to the hypovolemic sympathetic palsy and a CAP decrease. In reduced blood perfusion the cochlea of cats is more resistant than the brain.