Question

When performing a facial nerve study, a side-to-side amp drop of 50% is considered a:

a) Normal response
b) Mild abnormality
c) Significant abnormality
d) Severe abnormality

Answer 1

In a facial nerve study, a 50% drop in amplitude is considered a significant abnormality, indicating potential issues with the facial nerve. The strength test involving the eyelids helps assess facial muscle function and can be repeated to verify consistency and fatigue.

Step-by-step explanation:

When performing a facial nerve study, a side-to-side amplitude drop of 50% is considered a significant abnormality. The facial nerve is crucial for controlling the muscles of facial expression, and a proper assessment involves tests that may require contraction against resistance. In the video examination, the examiner asks the patient to squeeze their eyes shut and attempts to open them to evaluate the muscle strength. The examiner may ask the patient to try a second time to confirm the results and to assess if there is any fatigue or inconsistency, which could indicate a problem with the facial nerve or its innervated muscles.