Volume 18, Issue 6 pp. 842-849

Low frequency stimulation of the nucleus tegmenti pedunculopontini increases cortical metabolism in Parkinsonian patients

R. Ceravolo

R. Ceravolo

Clinica Neurologica, Dipartimento di Neuroscienze, Università di Pisa, Pisa

Both authors equally contributed to the manuscript.

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L. Brusa

L. Brusa

U.O.C. Neurologia, Ospedale S. Eugenio, ASL RMC, Rome

Both authors equally contributed to the manuscript.

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S. Galati

S. Galati

Clinica Neurologica, Dipartimento di Neuroscienze, Università di Roma Tor, Vergata, Rome

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D. Volterrani

D. Volterrani

Unità di Medicina Nucleare-Università di Pisa, Pisa

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A. Peppe

A. Peppe

IRCCS Fondazione S. Lucia, Rome, Italy

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G. Siciliano

G. Siciliano

Clinica Neurologica, Dipartimento di Neuroscienze, Università di Pisa, Pisa

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M. Pierantozzi

M. Pierantozzi

Clinica Neurologica, Dipartimento di Neuroscienze, Università di Roma Tor, Vergata, Rome

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V. Moschella

V. Moschella

Clinica Neurologica, Dipartimento di Neuroscienze, Università di Roma Tor, Vergata, Rome

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U. Bonuccelli

U. Bonuccelli

Clinica Neurologica, Dipartimento di Neuroscienze, Università di Pisa, Pisa

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P. Stanzione

P. Stanzione

Clinica Neurologica, Dipartimento di Neuroscienze, Università di Roma Tor, Vergata, Rome

IRCCS Fondazione S. Lucia, Rome, Italy

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A. Stefani

A. Stefani

Clinica Neurologica, Dipartimento di Neuroscienze, Università di Roma Tor, Vergata, Rome

IRCCS Fondazione S. Lucia, Rome, Italy

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First published: 19 November 2010
Citations: 32
A. Stefani, MD, IRCCS foundation S. Lucia, c/o Clinica Neurologica, Dipartimento di Neuroscienze, Università di Roma Tor Vergata, Rome, Italy (tel.: +39 620903119; fax: +39 620903118; e-mail: [email protected]).

Abstract

Background and purpose: To evaluate the effects of 25-Hz deep brain stimulation of the nucleus tegmenti pedunculopontini (PPTg) on brain metabolic activity.

Methods: Six patients with Parkinson’s disease (PD) who had bilateral stereotactic implantation of PPTg at least 12 months prior to evaluation were included in our study. All underwent, in separate sessions, 18-FDG-PET in core assessment programme for intra-cerebral transplantation as well as motor evaluation [Unified Parkinson’s disease rating scale (UPDRS) – section III] and a battery of cognitive testing.

Results: PPTg-ON (low bipolar contacts, 25 Hz) promoted a significant increase of glucose utilization in bilateral prefrontal areas including dorsolateral prefrontal cortex (DLPFC, BA9), orbito-frontal cortex (BA47), anterior cingulate (BA 25–32), superior frontal gyrus (BA 10) and supramarginal gyrus (BA40); a significant increase of uptake and consumption of FDG also occurred in the left ventral striatum, left subgyral (BA 46), right insula (BA 13) and right superior temporal gyrus (BA 22). PPTg-ON was associated with a significant decrease of glucose utilization in the left cerebellar anterior lobe (culmen) and right cerebellar posterior lobe (declive). In the same patients, PPTg-ON improved delayed recall (P < 0.05) and executive functions whilst the UPDRS revealed a modest (−21%) and variable treatment effect.

Conclusions: Low frequency stimulation of PPTg, a sub-region of the pedunculopontine nucleus complex, causes a minor motor benefit but a peculiar profile of cognitive improvement associated with a significant increase in FDG consumption in both prefrontal areas and mono-lateral ventral striatum. These data are consistent with multiple limbic and/or associative domains modulated by PPTg stimulation in our patients with PD.

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