Neuromagnetic measurement of unilateral temporo-parietal theta rhythm in patients with internal carotid artery occlusive disease

Rhythmic theta activity detected by electroencephalography (EEG) may be correlated with cerebrovascular brain diseases. Magnetoencephalography (MEG) has higher sensitivity and spatial resolution than conventional scalp EEG, so may be a better method to detect theta rhythm in patients with internal c...

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Bibliographic Details
Published in:NeuroImage (Orlando, Fla.) Fla.), 2005-04, Vol.25 (2), p.502-510
Main Authors: Seki, Shintarou, Nakasato, Nobukazu, Ohtomo, Satoru, Kanno, Akitake, Shimizu, Hiroaki, Tominaga, Teiji
Format: Article
Language:English
Subjects:
Adult
Aged
Atherosclerosis
Brain
Brain infarction
Carotid Artery, Internal
Carotid Stenosis - physiopathology
Disease
Electroencephalography
Female
Hospitals
Humans
Magnetoencephalography
Male
Medical imaging
Middle Aged
Parietal Lobe - physiopathology
Patients
Prospective Studies
Rhythm
Stroke
Studies
Temporal Lobe - physiopathology
Theta Rhythm
Tomography
Veins & arteries
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Summary:Rhythmic theta activity detected by electroencephalography (EEG) may be correlated with cerebrovascular brain diseases. Magnetoencephalography (MEG) has higher sensitivity and spatial resolution than conventional scalp EEG, so may be a better method to detect theta rhythm in patients with internal carotid artery (ICA) occlusive disease. Simultaneous EEG and MEG were performed in the awake state in 48 patients with unilateral ( n = 42) or bilateral ( n = 6) stenotic lesions (more than 60% occlusion) of the ICA ( n = 47) or middle cerebral artery ( n = 7), and in 27 age-matched healthy normal subjects. No subject had severe neurological deficits. MEG detected the theta rhythm (6–8 Hz) in 14 of 48 patients: ipsilateral to the stenotic or occluded side in 13 hemispheres and bilaterally in one patient with unilateral lesion. The source of the MEG theta rhythm was estimated in the dorsolateral temporo-parietal area, regardless of the location of infarct foci or the stenotic portion of the ICA system. The temporo-parietal theta rhythm was separated from the occipital alpha rhythm by frequency and distribution in MEG. The theta rhythm was found in only two patients by EEG, as well as by MEG. MEG provided better separation of this theta rhythm from the occipital alpha rhythm. Neither MEG nor EEG detected this theta rhythm in the normal subjects. Unilateral temporo-parietal theta rhythm is correlated with the hemisphere with ICA occlusive disease. This rhythm may indicate mild or subclinical abnormalities in the ICA system. MEG is superior to EEG for the detection and localization of theta rhythm.
ISSN:1053-8119
1095-9572
DOI:10.1016/j.neuroimage.2004.11.025