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[Chronic high frequency deep brain stimulation of the globus pallidus internus for torsion dystonia].
Deep Brain Stimulation (DBS, chronic high frequency stimulation) is well established for Parkinson's disease and tremordominant movement disorders. Generalized dystonia is known as a type of movement disorder in which therapeutic options are very limited. A case of generalized dystonia is reported which was successfully treated by DBS in the Globus pallidus internus (GPI). A 26 years old male suffered from severe torsion dystonia of the lower limbs. The onset of symptoms was at age 7. It started with dystonia of the left foot. He very fast developed severe dystonia of the lower limbs. These complaints were initially treated by diazepam, later by baclofen (Lioresal ((R))) p.o em leader There was no L-DOPA response. Because of the rapid progression of the disease a cervical spinal cord stimulator was implanted with a transient success. Due to further progression of the disease the patient became wheelchair bounded and resistant for oral medication. Limited improvement of symptoms was achieved using continuous intrathecal administration of baclofen. Finally the patient was treated with 980 microgram intrathecal Baclofen (Lioresal ((R))) daily and up to 100 mg diazepam. Under these conditions the patient remained wheelchair bounded with severe lower limb dystonia. As an ultima ratio it was decided to treat the patient with stereotactic implantation of two electrodes (Medtronic 3387) and two neurostimulators (Medtronic ITREL ((R))II). The GPI was the bilateral target point. Intraoperative computerized tomography and ventriculography were used for target setting. Furthermore microrecordings were helpful to ensure the exact electrode positioning. Surgery was performed under sedation. Two weeks after surgery first improvement of symptoms was observed. Patient was able to stand with assistance. At the three months follow-up he could walk without assistance. Slight dystonic movement of the left ankle was the only remaining symptom under stimulation. The oral medication has been continuously reduced. After 6 months it was stopped. The intrathecal administered baclofen was diminished to 250 microgram daily. At the 24 months follow-up the effect of stimulation remained unchanged. However high stimulation parameters are required to maintain an optimal effect (3,5 V, 400 microseconds 145 Hz for both sides). Deep Brain Stimulation of the Globus Pallidus internus is an alternative approach for severe cases of generalized dystonia.
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