Abstract
Cochlear potentials can be demonstrated only in the presence of intact hair cells. The amplitude of cochlear potentials is decreased by O2 lack as well as by extreme fall in blood pressure. Cochlear potentials are extremely sensitive to O2 lack, about 30 seconds'' deprivation of air supply being sufficient to produce reversible injury to the cochlea, 2 minutes'' deprivation being enough to cause irreparable damage to the organ.