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Electrophysiologic target localization in posteroventral pallidotomy
R P Iacono1, J D Carlson, S M Kuniyoshi
1Loma Linda University Medical Center, CA, USA.
Acta Neurochirurgica
|January 1, 1997
Summary
This study refines stereotactic posteroventral pallidotomy (PVP) for Parkinson's disease by using macroelectrode stimulation to precisely locate the target, ensuring consistent results and patient safety.
Area of Science:
- Neurosurgery
- Neurology
- Medical Devices
Background:
- Stereotactic posteroventral pallidotomy (PVP) is used for Parkinson's disease.
- Variability in published results raises questions about target localization techniques.
Purpose of the Study:
- To characterize macroelectrode stimulation parameters for precise target localization in PVP.
- To validate a technique for consistent anatomic lesion placement and improved patient outcomes.
Main Methods:
- Macroelectrode stimulation of internal capsule and optic tract within the globus pallidus.
- Recording threshold voltages and impedance at the target and along the electrode trajectory.
- Utilizing microelectrode recording for identifying pallidal borders and optic tract.
Main Results:
- Consistent anatomic lesion placement, excellent outcomes, and no complications in 57 PVP procedures.
- Significant decrease in voltage thresholds and increase in impedance as the probe approached the target.
- Macroelectrode stimulation accurately localized the target in the ansa lenticularis.
Conclusions:
- Macroelectrode stimulation provides accurate PVP target localization, leading to consistent outcomes.
- Microelectrode recording enhances safety, especially in unresponsive patients, by identifying critical structures.