Abstract
In Parkinson’s disease (PD), the effects of deep brain stimulation of the pedunculopontine nucleus (PPTg-DBS) on gait has been object of international debate. Some evidence demonstrated that, in the late swing-early stance phase of gait cycle, a reduced surface electromyographic activation (sEMG) of tibialis anterior (TA) is linked to the striatal dopamine deficiency in PD patients. In the present study we report preliminary results on the effect of PPTg-DBS on electromyographic patterns during gait in individual PD patients. To evaluate the sEMG amplitude of TA, the root mean square (RMS) of the TA burst in late swing-early stance phase (RMS-A) was normalized as a percent of the RMS of the TA burst in late stance-early swing (RMS-B). We studied three male patients in the following conditions: on PPTg-DBS/on l-dopa, on PPTg-DBS/off l-dopa, off PPTg-DBS/on l-dopa, off PPTg-DBS/off l-dopa. For each assessment the UPDRS III was filled in. We observed no difference between on PPTg-DBS/off l-dopa and off PPTg-DBS/off l-dopa in UPDRS III scores. In off PPTg-DBS/off l-dopa, patient A (right implant) showed absence of the right and left RMSA, respectively, in 80% and 83% of gait cycles. Patient B (right implant) showed absence of the right RMS-A in 86% of cycles. RMS-A of the patient C (left implant) was bilaterally normal. In on PPTg- DBS/off l-dopa, no patient showed reduced RMS-A. Although the very low number of subjects we evaluated, our observations suggest that PPTg plays a role in modulating TA activation pattern during the steady state of gait.
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We would like to thank Claudia Garattini, Ileana Minciotti and Chiara Simbolotti for their technical support.
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Caliandro, P., Insola, A., Scarnati, E. et al. Effects of unilateral pedunculopontine stimulation on electromyographic activation patterns during gait in individual patients with Parkinson’s disease. J Neural Transm 118, 1477–1486 (2011). https://doi.org/10.1007/s00702-011-0705-7
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DOI: https://doi.org/10.1007/s00702-011-0705-7