Blink reflex: prognostic value in acute peripheral facial palsy

Area of Science:

• Neurology
• Ophthalmology

Background:

• Bell's palsy and Ramsay Hunt's syndrome cause facial paralysis.
• Early prediction of recovery is crucial for patient management.

Purpose of the Study:

• To evaluate the blink reflex (BR) as an early prognostic indicator for facial paralysis.
• To correlate BR findings with recovery rates and lesion severity.

Main Methods:

• Studied 122 patients with Bell's palsy or Ramsay Hunt's syndrome within the first two weeks of onset.
• Classified patients based on early BR latency (R1 ≤ 13 ms, R1 > 13 ms, absent BR).
• Correlated BR results with recovery outcomes and electroneurogram (ENG) findings in 111 patients.

Main Results:

• A normal or delayed BR (R1 ≤ 13 ms or R1 > 13 ms) within two weeks showed a high rate of satisfactory recovery (93.7% and 86.8%, respectively).
• An absent BR was associated with a poor prognosis in 55.8% of patients.
• BR findings significantly correlated with lesion severity determined by ENG (p < 0.001).

Conclusions:

• Early blink reflex testing is a valuable tool for predicting prognosis in facial paralysis.
• While BR is a useful index, combining it with other tests like ENG may improve prognostic accuracy.