What physical examination finding is associated with acute labyrinthitis?

Acute labyrinthitis is an inflammatory condition affecting the inner ear structures responsible for balance and hearing. The hallmark physical examination finding in this condition is often normal appearance of the tympanic membranes, which may appear clear. This is significant because it suggests that there is no acute middle ear infection (otitis media) present, which could complicate the clinical picture. Labyrinthitis can occur as a complication of viral infections or secondary to other inflammatory processes that do not necessarily involve the middle ear.

In the context of acute labyrinthitis, the presence of clear tympanic membranes supports the diagnosis and helps differentiate it from other ear infections. The other potential findings, such as positive Brudzinski's sign (indicative of meningitis), rapid pulse (which may suggest various conditions or be related to anxiety or pain), and facial droop (which may indicate neurological or vascular issues), are not typically associated with labyrinthitis. Therefore, the observation of clear tympanic membranes is a key indicator that helps in identifying acute labyrinthitis.