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The influence of deep brain stimulation on the brain connectivity
Horváthová, Ľubica ; Výtvarová, Eva (oponent) ; Klimeš, Petr (vedoucí práce)
The deep brain stimulation (DBS) represents effective treatment for patients with Parkinson’s disease (PD) or patients with pharmacoresistant epilepsy. However its mechanisms by which it moderates seizures and improves movement still remain largely unknown. To understand it better and to determine in which frequency bands is the change most relevant, comparisons between DBS OFF and DBS ON were made using correlation method and phase lag index. Eleven patients with (PD) and with implanted neurostimulators for DBS from the companies Medtronic and St.Jude Medical are the subjects of the recorded data used in this thesis. The results prove that not only does the change in connectivity occur during the DBS, but also that the higher frequencies such as beta, low gamma and high gamma are affected the most. Changes in these frequencies, responsible for motor activity, attentive focusing and information processing, are consistent with the PD clinical findings. During this disease, pathological beta activity is hypersynchronized and gamma activity is reduced in motor areas. With gamma activity increasing during DBS ON, the physiological state of the patients is partially restoring and therefore improving their motility. The methods and results of this thesis will be used for further research on patients with PD and epilepsy.
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The influence of deep brain stimulation on the brain connectivity
Horváthová, Ľubica ; Výtvarová, Eva (oponent) ; Klimeš, Petr (vedoucí práce)
The deep brain stimulation (DBS) represents effective treatment for patients with Parkinson’s disease (PD) or patients with pharmacoresistant epilepsy. However its mechanisms by which it moderates seizures and improves movement still remain largely unknown. To understand it better and to determine in which frequency bands is the change most relevant, comparisons between DBS OFF and DBS ON were made using correlation method and phase lag index. Eleven patients with (PD) and with implanted neurostimulators for DBS from the companies Medtronic and St.Jude Medical are the subjects of the recorded data used in this thesis. The results prove that not only does the change in connectivity occur during the DBS, but also that the higher frequencies such as beta, low gamma and high gamma are affected the most. Changes in these frequencies, responsible for motor activity, attentive focusing and information processing, are consistent with the PD clinical findings. During this disease, pathological beta activity is hypersynchronized and gamma activity is reduced in motor areas. With gamma activity increasing during DBS ON, the physiological state of the patients is partially restoring and therefore improving their motility. The methods and results of this thesis will be used for further research on patients with PD and epilepsy.
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