Blink reflex recovery curves in blepharospasm, torticollis spasmodica, and hemifacial spasm

Job L.A. Eekhof, Majid Aramideh, Lo J. Bour, Anton A.J. Hilgevoord, Hans D. Speelman, Bram W. Ongerboer de Visser

Research output: Contribution to journalArticleAcademicpeer-review

74 Citations (Scopus)

Abstract

R1 and R2 blink reflex responses to single and paired stimuli were investigated in 23 control subjects, 21 patients with blepharospasm (BSP), 20 patients with torticollis spasmodica (TS), and 23 with hemifacial spasm (HFS). For paired stimuli, we compared measurements of area and peak responses at two and three times R2 threshold. R1 and R2 indices were calculated as the average of the recovery values at 0.5-, 0,3-, and 0.21-s interstimulus intervals to test individual patients. Peak amplitude measurements at three times R2 threshold were optimal. The R2 index was abnormal in 67% of BSP patients, 37% of TS patients, and 50% of HFS patients on the affected side and 20% on the unaffected side. A normal R2 index in one third of patients with BSP may indicate that different pathophysiological mechanisms are involved in this type of focal dystonia.

Original languageEnglish
Pages (from-to)10-15
Number of pages6
JournalMuscle and Nerve
Volume19
Issue number1
DOIs
Publication statusPublished - 1 Jan 1996
Externally publishedYes

Keywords

  • Blepharospasm
  • Blink reflex
  • Hemifacial spasm
  • Torticollis spasmodica

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