Auditory Brainstem Response (ABR) is a test that evaluates hearing by measuring the electrical activity generated by the auditory nerve and brainstem in response to sound. The word "auditory" is pronounced as /ˈɔː.dɪ.tər.i/ with stress on the second syllable. "Brainstem" is spelled as /ˈbreɪn.stem/ with the primary stress on the first syllable. "Response" is pronounced as /rɪˈspɒns/ with secondary stress on the first syllable. The spelling of ABR follows the rules of English phonetics and emphasizes the key components of the test.
Auditory Brainstem Response (ABR), also known as the auditory evoked potential, is a neurophysiological test used to assess the integrity and functionality of the auditory system, specifically the neural pathways from the cochlea in the inner ear to the brainstem.
ABR is typically performed by placing a set of electrodes on the patient's scalp and earlobes to record the electrical activity generated by the auditory system in response to sound stimuli. A series of clicks or tone bursts are presented through headphones or ear inserts, which stimulate the auditory system. As the stimuli reach the cochlea, they trigger a cascade of electrical signals that travel along the auditory nerve and up to the brainstem.
The recorded electrical responses are then analyzed to determine the latency and amplitude of various peaks or waves, which correspond to different stages of neural processing in the auditory pathway. These peaks provide valuable information about the overall health and functionality of the auditory system.
ABR tests are commonly used to assess hearing sensitivity, identify the presence and location of hearing loss, evaluate auditory nerve function, screen for auditory disorders in infants and young children who cannot provide behavioral responses, and monitor auditory function during certain surgical procedures. It is a reliable and non-invasive diagnostic tool that helps professionals make accurate diagnoses and develop appropriate treatment plans for individuals with hearing disorders.