The use of flexible botulinum toxin type A inter-injection intervals after removal of deep brain stimulation due to infection in patient with DYT-THAP1 (DYT6)

Deep brain stimulation of globus pallidus internus is a safe and effective method of treatment of isolated generalized dystonia. Abrupt discontinuation of stimulation can lead to a sharp increase in the severity of the condition with a significant increase in the risk of dystonic status. Correction of the condition by selecting conservative therapy is often insufficient. Based on the description of a clinical observation, we demonstrated the possibility of effective use of flexible botulinum toxin type A inter-injection intervals after removal of deep brain stimulation due to infection in patient with DYT-THAP1 (DYT6). Due to the high risk of formation of antibodies to botulinum toxin type A when using short intervals, as well as when using high doses, preference was given to a drug with proven low immunogenicity — incobotulotoxin A. Incobotulotoxin A was administered once a month in a total dose of 400 units to various muscle groups (head, neck, trunk, limbs). At the time of publication, the duration of follow-up was six months, six procedures were performed, a total of 2,400 units of incobotulotoxin A. No significant side effects were noted. Evaluation of the effectiveness of the therapy was carried out by calculating the points of the Burke–Fahn–Marsden Dystonia Rating Scale. There was a decrease from 34 points (the indicator at the time of termination of neurostimulation) to 13.5 points (after six months of therapy). The therapy allowed the patient to maintain motor activity during the waiting period for repeated deep brain stimulation.