Abstract
Background
The dorso-lateral part of the subthalamic nucleus (STN) is considered as the usual target of deep brain stimulation for Parkinson’s disease. Nevertheless, the exact anatomical location of the electrode contacts used for chronic stimulation is still a matter of debate. The aim of this study was to perform a systematic review of the existing literature on this issue.
Method
We searched for studies on the anatomical location of active contacts published until December 2012.
Results
We identified 13 studies, published between 2002 and 2010, including 260 patients and 466 electrodes. One hundred and sixty-four active contacts (35 %) were identified within the STN, 117 (25 %) at the interface between STN and the surrounding structures, 184 (40 %) above the STN and one within the substantia nigra. We observed great discrepancies between the different series. The contra-lateral improvement was between 37 and 78.5 % for contacts located within the STN, between 48.6 and 73 % outside the STN, between 65.3 and 66 % at the interface. The authors report no clear correlation between anatomical location and stimulation parameters.
Conclusions
Post-operative analysis of the anatomical location of active contacts is difficult, and all the methods used are debatable. The relationship between the anatomical location of active contacts and the clinical effectiveness of stimulation is unclear. It would be necessary to take into account the volume of the electrode contacts and the diffusion of the stimulation. We can nevertheless assume that the interface between dorso-lateral STN, zona incerta and Forel’s fields could be directly involved in the effects of stimulation.
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Comment
This is a convenient review addressing two relevant questions: 1. Which is the proper target for DBS in PD and 2. If there is a need for intraoperative microelectrode recording and clinical testing versus the possibility of using radiological targeting only. The authors conclude that the proper subthalamic area target, instead of being exclusively at the dorsolateral part of the subthalamic nucleus, may lay in interface between the dorso-lateral subthalamic nucleus, the zona incerta and Forel's fields. This may stress the need for intraoperative electrophysiologic and clinical testing to find the individual's most effective stimulation site, while targeting with only radiological means could lead to less than effective electrode placements.
The main weakness of this study is one already recognized by the authors: how the exact position of the contacts is determined postoperatively. However, as the authors recognize, this may lead to the development of prospective clinical trials to further clarify this issue.
Juan A Barcia M.D.,Ph.D,
Madrid, Spain
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Caire, F., Ranoux, D., Guehl, D. et al. A systematic review of studies on anatomical position of electrode contacts used for chronic subthalamic stimulation in Parkinson’s disease. Acta Neurochir 155, 1647–1654 (2013). https://doi.org/10.1007/s00701-013-1782-1
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DOI: https://doi.org/10.1007/s00701-013-1782-1