A1 Refereed original research article in a scientific journal
Cortical 6-[F-18]fluoro-L-dopa uptake and frontal cognitive functions in early Parkinson's disease
Authors: Bruck A, Aalto S, Nurmi E, Bergman J, Rinne JO
Publisher: ELSEVIER SCIENCE INC
Publication year: 2005
Journal: Neurobiology of Aging
Journal name in source: NEUROBIOLOGY OF AGING
Journal acronym: NEUROBIOL AGING
Volume: 26
Issue: 6
First page : 891
Last page: 898
Number of pages: 8
ISSN: 0197-4580
DOI: https://doi.org/10.1016/j.neurobiolaging.2004.07.014
Abstract
yPatients with Parkinson's disease (PD) have already at the early stages of the disease impaired performance especially in tests measuring frontal lobe functions such as attention. The pathophysiological basis of these deficits is unclear. In the present study, 21 non-demented, non-medicated patients at the early stage of PD and 24 healthy controls underwent a positron emission tomography (PET) scan with 6[F-18]fluoro-L-dopa (Fdopa) as the tracer. In addition, the PD patients performed a neuropsychological test battery, including a test measuring sustained attention (VIG) and a test requiring suppressed attention (Stroop). Both voxel-based Statistical Parametric Mapping (SPM) and automated region of interest (ROI) analysis were employed. Compared to controls, the PD patients had decreased Fdopa uptake in the striatum and a large cortical area of increased Fdopa uptake. The reaction time in the VIG test correlated positively with the Fdopa uptake of the dorsolateral prefrontal cortex and the performance in the Stroop test correlated negatively with the Fdopa uptake in an area including the medial frontal cortex and the anterior cingulate. The results show that cortical Fdopa uptake is increased in early non-medicated PD and suggest that the changes in frontal Fdopa uptake are related to cognitive impairments found in early PD. (c) 2004 Elsevier Inc. All rights reserved.
yPatients with Parkinson's disease (PD) have already at the early stages of the disease impaired performance especially in tests measuring frontal lobe functions such as attention. The pathophysiological basis of these deficits is unclear. In the present study, 21 non-demented, non-medicated patients at the early stage of PD and 24 healthy controls underwent a positron emission tomography (PET) scan with 6[F-18]fluoro-L-dopa (Fdopa) as the tracer. In addition, the PD patients performed a neuropsychological test battery, including a test measuring sustained attention (VIG) and a test requiring suppressed attention (Stroop). Both voxel-based Statistical Parametric Mapping (SPM) and automated region of interest (ROI) analysis were employed. Compared to controls, the PD patients had decreased Fdopa uptake in the striatum and a large cortical area of increased Fdopa uptake. The reaction time in the VIG test correlated positively with the Fdopa uptake of the dorsolateral prefrontal cortex and the performance in the Stroop test correlated negatively with the Fdopa uptake in an area including the medial frontal cortex and the anterior cingulate. The results show that cortical Fdopa uptake is increased in early non-medicated PD and suggest that the changes in frontal Fdopa uptake are related to cognitive impairments found in early PD. (c) 2004 Elsevier Inc. All rights reserved.
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