Abstract
Dystonia patients undergoing deep brain stimulation (DBS) often require individualized stimulation settings. While effective settings reduce dystonia, excessive stimulation can worsen symptoms. Assessing DBS effects during office visits is challenging, as clinical changes can be delayed hours to days.
We evaluated whether local field potentials (LFPs) could serve as an acute biomarker of excessive stimulation in dystonia patients.
Real-time LFP band power and dystonia severity were quantified and compared during sequential changes in stimulation amplitude.
Increased stimulation current amplitude led to patient-specific LFP band power increase which was temporally aligned and correlated with clinically evident dystonia worsening, in all subjects, during in-office DBS programming sessions.
Although increased LFP band power correlated with clear clinical worsening in these patients, we anticipate that not all patients with dystonia will have such immediate signs of worsening. Increased LFP band power during incremented stimulation amplitude may represent a biomarker for patients at-risk of manifesting delayed clinical worsening.