Hearing test - ABR latencies

• During the examination, silence is required, the subject cannot chew or swallow, and the eyes are closed to reduce visual stimuli.

• In young children, the examination is most often performed after feeding, while they are sleeping :
  1) During the night or early morning hours before the examination (before the usual waking time), it is necessary to wake the child and not allow them to fall asleep again until they arrive at the examination room, so that the child is sleepy and tired at the time of the examination.
  Care should be taken to ensure that the child does not fall asleep during the journey!
  2) The child should be slightly hungry upon arrival for the examination. For example, the child should eat their last meal in the evening and then again in the morning in the examination room before falling asleep.
  Feeding the child just before the examination increases the chances of falling asleep faster.

The test assesses the functioning of the auditory pathway down to the brainstem by assessing the V wave (critical for proper auditory pathway function).
Three electrodes are placed on the patient's head: an active electrode on the forehead and two electrodes on the mastoid processes of both ears. Earphones are placed in the ear canals, emitting clicks or tones. A computer records the responses, averaging the electrical potential values, and saves the results.

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