Elsevier

Surgical Neurology

Volume 56, Issue 2, August 2001, Pages 89-94
Surgical Neurology

Functional neurosurgery
Effect of bilateral subthalamic electrical stimulation in Parkinson’s disease

https://doi.org/10.1016/S0090-3019(01)00533-XGet rights and content

Abstract

BACKGROUND

Bilateral high frequency subthalamic stimulation has been reported to be effective in the treatment of Parkinson’s disease and levodopa-induced dyskinesias. To analyze the results of this surgical procedure we critically reviewed 17 parkinsonian patients with advanced disease complicated by motor fluctuations and dyskinesias.

METHODS

Between January 1998 and June 1999 these 17 consecutive patients (age 48–68 years; illness duration 8–27 years) underwent bilateral stereotactically guided implantation of electrodes into the subthalamic nucleus in the Department of Neurosurgery of the Istituto Nazionale Neurologico “C. Besta.” Parameters used for continuous high-frequency stimulation were: frequency 160 Hz, pulse width 90 μsec, mean amplitude 2.05 ± 0.45 V. Parts II and III of the UPDRS were used to assess motor performance before and after operation by the neurologic team. The follow-up ranged between 6 and 18 months.

RESULTS

At latest examination, mean UPDRS II and III scores had improved by 30% (on stimulation, off therapy) with mean 50% reduction in daily off time. Peak dyskinesias and early morning dystonias also improved in relation to therapy reduction. Side effects were persistent postoperative supranuclear oculomotor palsy and postural instability in one case, worsened off-medication hypophonia in three, and temporary nocturnal confusion episodes in three. Postoperative MRI revealed a clinically silent intracerebral haematoma in one case. One electrode required repositioning.

CONCLUSIONS

Continuous high frequency STN stimulation is an effective treatment for advanced PD. A functionally useful and safe electrode placement can be performed without microrecording.

Section snippets

Patients

Between January 1998 and June 1999 17 consecutive patients (age 48–68 years; illness duration 8–27 years) underwent bilateral stereotactically guided implantation of electrodes into the subthalamic nucleus at the Department of Neurosurgery of the Istituto Nazionale Neurologico “C. Besta.” Baseline clinical data are shown in Table 1. All had advanced PD with severe motor fluctuations and dyskinesias despite treatment with levodopa and dopamine agonists. No other neurological impairment was

Results

Mean scores in the UPDRS part II (Table 2) and III (Table 3) significantly improved after surgery. Table 4 summarizes the improvements in parts II and III of UPDRS on and off medication while being stimulated. The percentage improvement was greatest (around 50%) in activities of daily living (part II) when the patients were on medication and on stimulation, while the improvement was around 30% for UPDRS parts II and III off medication and on stimulation.

The most remarkable result was the

Discussion

Our results confirm that continuous high-frequency STN stimulation may improve all parkinsonian motor signs and levodopa-induced motor complications, even in cases of advanced disease with severe motor fluctuations and dyskinesias. Although there were large between-subject variations, all patients in this series benefited significantly from electrode implantation (Figure 1) and STN stimulation. The most striking finding in our patients was that both “off” time and dyskinesias were reduced after

Conclusions

Continuous high-frequency STN stimulation is an effective treatment for advanced PD. Functionally useful and safe electrode placement can also be performed without microrecording [15]. In our experience, it reduced the severity of parkinsonian signs and levodopa-related dyskinesias, the latter sometimes improving before levodopa reduction. The best results are obtained in younger, levodopa-responding patients, but a mild improvement, positively affecting the quality of life, may be observed

References (21)

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