Alteration of brain stem auditory evoked responses following cardio-respiratory arrest and resuscitation.

BAERs were recorded in a patient who suffered spontaneous cardio-respiratory arrest after testing had begun. During the arrest the BAERs initially decreased in amplitude and then could not be recorded. After restoration of cardiac activity there was immediate recovery of waves I and II. Subsequent potentials also immediately reappeared but they did not recover their original peak latency values during the 50 min following resuscitation.