Subthalamic nucleus deep brain stimulation: an invaluable role for MER

Area of Science:

• Neurosurgery
• Neurology
• Medical Device Technology

Background:

• Subthalamic nucleus (STN) deep brain stimulation (DBS) is a primary surgical intervention for advanced Parkinson's disease.
• The utility of intra-operative microelectrode recording (MER) for precise STN localization and mapping remains a subject of ongoing discussion.

Purpose of the Study:

• To evaluate the discrepancies between stereotactic atlas/MRI-based targeting and neurophysiological localization of the STN during DBS surgery.
• To assess the clinical significance of MER in refining STN targeting for Parkinson's disease patients.

Main Methods:

• Retrospective chart and operative report review of 43 patients undergoing STN DBS for Parkinson's disease (2004-2011).
• Comparison of STN anatomical boundaries derived from Schaltenbrand's Stereotactic Atlas with those determined by intra-operative MER.

Main Results:

• MER revealed average dorsal and ventral STN boundaries at -2.6 mm and +2.0 mm from target, differing from Stereotactic Atlas estimates (-5.0 mm and +1.4 mm).
• The STN's average dorsal-ventral distance measured 4.6 mm via MER, compared to 6.4 mm predicted by the Stereotactic Atlas.
• Side-specific MER boundary estimations showed minor variations between left (-2.6 mm dorsal, +2.2 mm ventral) and right (-2.5 mm dorsal, +1.8 mm ventral) STN targets.

Conclusions:

• Microelectrode recording in STN DBS surgery provides neurophysiological localization that measurably differs from stereotactic atlas/MRI targeting.
• These findings highlight the importance of MER in optimizing STN targeting accuracy for improved surgical outcomes in Parkinson's disease.