title: Comparative electrophysiological study of response to botulinum toxin type B in Japanese and Caucasians.
abstract: Ethnic differences in the muscle-relaxing effect of botulinum toxin type B (BTX-B) were examined by means of electrophysiological measurements in Japanese and Caucasian volunteers. This was a randomized, single-blinded, single-center study of 24 Japanese and 24 Caucasian healthy adult male subjects in Japan. BTX-B (20 U, 100 U, or 500 U/0.2 mL) or placebo was administered to the extensor digitorum brevis (EDB) muscle in the left lower limb as a single dose (in each dose group, 6 subjects received the test drug and two received placebo). The inhibitory effect of BTX-B on the M wave amplitude of EDB muscle generated by stimulation of the deep peroneal nerve was measured frequently during 2 weeks after administration, and then at weeks 4 (day 28) and 12 (day 84). The inhibitory effect of BTX-B on the M wave amplitude of EDB muscle was dose-dependent in both Japanese and Caucasian subjects, and the dose-response curves were similar. These findings demonstrate that the muscle-relaxing effect of BTX-B in Japanese subjects is electrophysiologically similar to that in Caucasians.
authors.affiliation: Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan. ari@m2.kufm.kagoshima-u.ac.jp
authors.forename: Kimiyoshi
authors.initials: K
authors.lastname: Arimura
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Arimura
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Takata
authors.forename: Tomonori
authors.initials: T
authors.lastname: Nakamura
authors.forename: Ryuji
authors.initials: R
authors.lastname: Kaji
mesh_terms: D000328:Adult; D044466:Asian People / Q000208:ethnology*; D001905:Botulinum Toxins / Q000008:administration & dosage*; D019274:Botulinum Toxins, Type A; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004594:Electrophysiology / Q000379:methods*; D006801:Humans; D007273:Injections, Intramuscular; D008297:Male; D008875:Middle Aged; D009119:Muscle Contraction / Q000187:drug effects; D009132:Muscles / Q000187:drug effects*; D013997:Time Factors; D044465:White People / Q000208:ethnology*
chemical_list: C096323:rimabotulinumtoxinB; D001905:Botulinum Toxins; D019274:Botulinum Toxins, Type A