title: Utility of an EMG mapping study in treating cervical dystonia.
abstract: Intramuscular injections of botulinum toxin are the cornerstone of treatment for cervical dystonia. Controversy exists regarding the necessity for EMG-guided injections. We compared the clinical examination of four movement disorder specialists to an electromyographic (EMG) mapping study. Clinical predictions of individual muscle involvement were only 59% sensitive and 75% specific. Muscle hypertrophy, shoulder elevation, and dominant head vector did not bolster clinical accuracy. An EMG mapping study facilitates identification of dystonic muscles in cervical dystonia, which may enhance botulinum toxin therapy.
authors.affiliation: Department of Neurology, Mayo Clinic and Foundation, 200 2nd Street SW, Rochester, Minnesota 55905, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Van Gerpen
authors.forename: J Y
authors.initials: JY
authors.lastname: Matsumoto
authors.forename: J E
authors.initials: JE
authors.lastname: Ahlskog
authors.forename: D M
authors.initials: DM
authors.lastname: Maraganore
authors.forename: P G
authors.initials: PG
authors.lastname: McManis
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018726:Anti-Dyskinesia Agents / Q000627:therapeutic use*; D001905:Botulinum Toxins / Q000627:therapeutic use*; D002574:Cervical Vertebrae; D004576:Electromyography / Q000592:standards*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014103:Torticollis / Q000175:diagnosis* / Q000188:drug therapy* / Q000503:physiopathology
chemical_list: D018726:Anti-Dyskinesia Agents; D001905:Botulinum Toxins