Botox for Cervical Dystonia Following EMG Mapping

Inclusion criteria: * Male or female subjects, 18 to 75 years of age. * Ability to follow study instructions and complete all required visits. * Subject meets diagnostic criteria for idiopathic primary cervical dystonia. * Subject has at least moderate severity Cervical Dystonia, with a baseline rating of at least 30 on the total TWSTRS and at least 15 on the TWSTRS motor severity subsection. * Patients have had a suboptimal response to 2 previous Botulinum toxin injections at an outside facility. * Patients will not have received Botulinum toxin within 16 weeks of the start of the study. * In order to not confound the clinical response to BTX-A injections, all patients enrolled must have been on a stable medication regimen for 30 days. If they are not on medication at the initiation of the study, they will not be started on medication. Patients must be on the same medication regimen through the entire study including assessment of both single lead EMG based injections and "mapping" based injections. Medications cannot be stopped during the study to avoid confounding the clinical response to BTX-A. Exclusion Criteria: * Known allergy or sensitivity to any of the components in BTX-A. * Uncontrolled clinically significant medical condition other than the condition under evaluation * Females with a positive pregnancy test, or who are breast-feeding, planning a pregnancy during the study, who think that they may be pregnant at the start of the study or females of childbearing …