Trigeminal dysfunction in patients with Bell's palsy.
The trigeminal function was investigated in 30 consecutive patients with acute unilateral peripheral facial palsy. The patients were tested with electrophysiological methods within 5 weeks after onset of the disease. Trigeminus-evoked potential test (TEP) disclosed trigeminal dysfunction in 47%, while the blink reflex test (BR) showed trigeminal pathology in 60% of the patients. A topographical analysis of the trigeminal system showed that 24% of the patients had BR patterns that were consistent with brainstem involvement. In 2 cases (7%), TEP was pathological though the BR test proved normal. These findings suggest a more central trigeminal affection and may demonstrate multifocal lesions. This was further underlined by the investigation of the auditory brainstem response (ABR) which indicated brainstem involvement in 28%. It is concluded that acute facial palsy is frequently a symptom of a central nervous affection.
P
P
Hanner
G
G
Badr
U
U
Rosenhall
S
S
Edström
D000293:Adolescent; D000328:Adult; D000368:Aged; D001300:Audiometry, Evoked Response; D001933:Brain Stem / Q000503:physiopathology; D004576:Electromyography; D005071:Evoked Potentials; D005133:Eye Movements; D005158:Facial Paralysis / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012018:Reflex; D014276:Trigeminal Nerve / Q000503:physiopathology*