On a normally functioning auditory pathway, the interpeak latency between Waves I and V of the auditory brainstem response is approximately:

• A 1 millisecond
• B 2 milliseconds
• C 4 milliseconds ✓
• D 8 milliseconds

Explanation

The absolute latency of Wave V at high click intensities is about 5.5 to 6 milliseconds, and Wave I occurs at about 1.5 to 2 milliseconds, giving a normal Wave I to V interpeak interval of approximately 4 milliseconds. Interpeak latencies are preferred over absolute latencies for detecting retrocochlear disease because they are independent of peripheral hearing level and stimulus intensity. Prolongation beyond the normative limit suggests demyelination, compression, or tumor along the VIII nerve and brainstem.

Reference: Glasscock-Shambaugh, Surgery of the Ear, 6th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.