Scientific publications

Subthalamic activity during diphasic dyskinesias in Parkinson's disease

Alegre M [SP], López-Azcárate J, Alonso-Frech F, Rodríguez-Oroz MC, Valencia M, Guridi J, Artieda J [SP], Obeso JA.
Neurosciences Area, CIMA, University of Navarra, Pamplona, Spain; Neurophysiology Section, Clínica Universidad de Navarra, Pamplona, Spain

Magazine: Movement Disorders

Date: Jun 28, 2012

Neurosurgery Neurology [SP] Neurophysiology [SP]

BACKGROUND
Diphasic dyskinesias are a subtype of levodopa-induced dyskinesias that appear typically at the onset and end of levodopa antiparkinsonian action. The pathophysiology of diphasic dyskinesias is not well understood.

METHODS
We analyzed local field potentials recorded from the subthalamic nucleus in 7 Parkinson's disease (PD) patients who showed typical diphasic dyskinesias during postoperative recordings through a deep brain stimulation electrode. The evolution of the different oscillatory activities related to the onset and end of diphasic dyskinesias was studied by windowed fast Fourier transforms.

RESULTS
Typical "off"-state beta activity disappeared with the onset of diphasic dyskinesias, whereas gamma activity was absent or minimal until their end. Theta activity during diphasic dyskinesias was similar to that observed during peak-dose dyskinesias.

CONCLUSIONS
From a neurophysiological viewpoint, patients exhibited oscillatory activity typical of the "on" medication state during diphasic dyskinesias. The minimal presence of gamma activity during diphasic dyskinesias, however, suggests that this "on" state might be incomplete or limited to dopaminergic mechanisms affecting the lower limbs.

CITATION   2012 Jun 28. doi: 10.1002/mds.25090

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