Contraversive eye deviation during stimulation of the subthalamic region.
Contraversive eye deviation (CED) is most often observed intraoperatively during subthalamic nucleus implantation for Parkinson's disease and considered to result from wrong electrode positioning. We report on a woman, bilaterally implanted in the subthalamic nucleus for severe Parkinson's disease disclosing long-lasting CED only when the stimulators were activated separately. Clinical examination and eye movements recording in this patient showed that CED occurred when stimulation was applied at the site and at similar intensity used for the best antiparkinsonian effect. These results suggest that the subthalamic area may be involved in orienting movements, either through the subthalamic nucleus itself or the fibers from the Frontal Eye Fields. Interestingly, this report shows that CED may be corrected by bilateral stimulation and that CED may not necessarily implicate electrode repositioning.
Sauleau
Paul
P
Department of Neurophysiology, Université de Rennes 1, CHU de Rennes, France. paul.sauleau@univ-rennes1.fr
Pollak
Pierre
P
Krack
Paul
P
Pélisson
Denis
D
Vighetto
Alain
A
Benabid
Alim-Louis
AL
Tilikete
Caroline
C
D000328:Adult; D004599:Electric Stimulation Therapy / Q000009:adverse effects*; D004567:Electrodes, Implanted / Q000009:adverse effects; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008279:Magnetic Resonance Imaging; D015835:Ocular Motility Disorders / Q000209:etiology* / Q000473:pathology; D010300:Parkinson Disease / Q000473:pathology / Q000628:therapy; D020531:Subthalamic Nucleus / Q000503:physiopathology*