Stereotactic posterioventral pallidotomy improves balance control as assessed by computerized posturography

Area of Science:

• Neuroscience
• Neurosurgery
• Movement Disorders

Background:

• Postural instability is a primary debilitating symptom in Parkinson's disease (PD).
• Posterioventral pallidotomy/pallidoansotomy (PVP) is a surgical intervention explored for various PD symptoms.
• While dyskinesias, rigidity, and bradykinesia are commonly studied, PVP's effect on posture and gait requires further analysis.

Purpose of the Study:

• To prospectively evaluate the impact of posterioventral pallidotomy (PVP) on postural control in Parkinson's disease patients.
• To compare the efficacy of PVP in improving balance against preoperative medication effects.

Main Methods:

• 14 Parkinson's disease patients (7 male, 7 female) underwent 18 PVP procedures (including bilateral and combined Vim thalamotomies).
• Postural control was assessed using computerized dynamic posturography pre- and postoperatively.
• Data collection occurred during both 'off' (drug-free) and 'on' (medicated) periods, with postoperative analysis 1-3 months after surgery.

Main Results:

• Overall balance improved in the 'off' state post-PVP, with a reduced fall rate from 31% to 23%.
• Anterior-posterior sway significantly decreased postoperatively, particularly in sway-referenced conditions (p < 0.05).
• Post-PVP 'off' state balance improvement surpassed preoperative 'on' state medication effects (p < 0.05).

Conclusions:

• Posterioventral pallidotomy (PVP) enhances standing balance performance in Parkinson's disease patients more effectively than preoperative medication.
• The improvements suggest a centralized mechanism of action for PVP, potentially impacting central input parameters for balance control.