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Blink reflex and discomplete facial nerve palsy
1Departamento de Medicina Interna y Ciencias Básicas, Unidad de Neurología, Facultad de Salud, Universidad Industrial de Santander (UIS), Bucaramanga, Colombia. feleoness@yahoo.com
Archives of Medical Research
|February 5, 2002
Summary
Bell's palsy diagnosis can be improved by observing a late blink reflex response (R3) on the affected side. This finding suggests residual nerve function, aiding in more accurate diagnosis and follow-up of facial nerve palsies.
Area of Science:
- Neurology
- Neurophysiology
Background:
- Bell's palsy typically presents with prolonged latencies or absent early/middle blink reflex responses.
- Standard electrophysiologic findings in Bell's palsy are often limited in diagnostic scope.
Observation:
- A case study of a 42-year-old male with right-side Bell's palsy was conducted.
- Facial nerve conduction and blink reflex studies were performed using validated protocols.
Findings:
- Absence of early (R1) and middle (R2) blink reflex responses on the affected side.
- A late blink reflex response (R3) was observed on the paralyzed side during voluntary facial muscle activation.
- Facial nerve conduction studies showed an absent compound muscle action potential on the affected side.
Implications:
- The R3 response indicates residual nerve function in some Bell's palsy cases.
- Observing R3 may enhance diagnostic accuracy and facilitate patient follow-up.
- This finding suggests alternative pathways may remain viable in facial nerve palsies.