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Of the 32 patients with active intractable seizures, 27 had spastic cerebral palsy (CP) and 5 had epilepsy (EP), and all underwent chronic cerebellar stimulation (CCS) (amplitude 1–2 µC/cm²phase, rate 10–180 pps, duration of implantation 0.5–7 years, average 4.5 years). Grand mal seizures occurred in 23 patients (19 CP, 4 EP); with CCS 17 patients stopped, 4 had a reduction, 3 were unchanged. Petit mal occurred in 9 patients (8 CP, 1 EP); with CCS 4 patients ceased seizuring, 3 reduced and 2 were unchanged. Myoclonic seizures were present in 6 patients (5 CP, 1 EP); with CCS 1 patient stopped, 3 had a reduction while 2 patients were unaffected. Severe psychomotor seizuring affected 2 EP patients, 1 had a marked behavioral improvement and finally stopped seizuring for the past 9 months. Overall, CCS stopped 18 (57%) of the patients seizuring, reduced a further 9 (28%), with no effect in 5 patients (15%).

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By stimulating the medial aspect of the superior surface of the cerebellum with relatively short, low current stimulating pulses, spasticity and some involuntary movements have been reduced. Voluntary movements, as a result, are able to come through better; however, if the child has little voluntary ability, he is at least more relaxed, thus allowing the parents to care for him more easily. The children and adults with cerebral palsy have not been transformed from their previous status, although CCS has allowed them to become more independent, more ambulatory, and more communicative.