Yik, Neoh Yee
(2018)
The use of magnetoencephalographic brainwaves in detecting neurocognitive impairments in traumatic brain injury.
Masters thesis, Universiti Sains Malaysia.
Abstract
Objectives: The purpose of this study was to investigate the potential of
magnetoencephalography (MEG) as a tool for early detection of brainwave disruption in
traumatic brain injury (TBI) patients and compare the MEG results to neuropsychological
assessments.
Methods: Our study consisted of 12 TBI patients aged 14–26 who had a Glasgow Coma Scale
(GCS) of 9–13 in the first 24 hours after a motor vehicle accident. According to the severity of
their GCS score, and regardless of the type of brain injury, patients were then distributed into
two groups, moderate TBI (GCS score 9–12) or mild TBI (GCS score of 13).
Neuropsychological tests were given to patients before the MEG recording. MEG was used to
measure the power of the different frequency bands delta, theta, alpha, beta, and gamma.
Results: The power of the beta frequency band was reduced and the theta/beta ratio was
significantly increased in the moderate TBI group compared to the mild TBI group.
Neuropsychological assessments results tended to support this finding but did not reach
significance.
Discussion: The MEG results suggest that moderate TBI patients have greater processing and
attention deficits than mild TBI patients. We concluded that MEG plays an important role in
objectively detecting brain wave changes after TBI, which has implications for the prediction
of cognitive sequelae after TBI.
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