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Gimenez-Aparisi G, Guijarro-Estelles E, Chornet-Lurbe A, Ballesta-Martinez S, Pardo-Hernandez M, Ye-Lin Y. Early detection of Parkinson's disease: Systematic analysis of the influence of the eyes on quantitative biomarkers in resting state electroencephalography. Heliyon 2023; 9:e20625. [PMID: 37829809 PMCID: PMC10565694 DOI: 10.1016/j.heliyon.2023.e20625] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 07/24/2023] [Accepted: 10/02/2023] [Indexed: 10/14/2023] Open
Abstract
While resting state electroencephalography (EEG) provides relevant information on pathological changes in Parkinson's disease, most studies focus on the eyes-closed EEG biomarkers. Recent evidence has shown that both eyes-open EEG and reactivity to eyes-opening can also differentiate Parkinson's disease from healthy aging, but no consensus has been reached on a discriminatory capability benchmark. The aim of this study was to determine the resting-state EEG biomarkers suitable for real-time application that can differentiate Parkinson's patients from healthy subjects under both eyes closed and open. For this, we analysed and compared the quantitative EEG analyses of 13 early-stage cognitively normal Parkinson's patients with an age and sex-matched healthy group. We found that Parkinson's disease exhibited abnormal excessive theta activity in eyes-closed, which was reflected by a significantly higher relative theta power, a higher time percentage with a frequency peak in the theta band and a reduced alpha/theta ratio, while Parkinson's patients showed a significantly steeper non-oscillatory spectral slope activity than that of healthy subjects. We also found considerably less alpha and beta reactivity to eyes-opening in Parkinson's disease plus a significant moderate correlation between these EEG-biomarkers and the MDS-UPDRS score, used to assesses the clinical symptoms of Parkinson's Disease. Both EEG recordings with the eyes open and reactivity to eyes-opening provided additional information to the eyes-closed condition. We thus strongly recommend that both eyes open and closed be used in clinical practice recording protocols to promote EEG as a complementary non-invasive screening method for the early detection of Parkinson's disease, which would allow clinicians to design patient-oriented treatment and improve the patient's quality of life.
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Affiliation(s)
- G. Gimenez-Aparisi
- Centro de Investigación e Innovación en Bioingeniería, Universitat Politècnica de València, 46022, València, Spain
| | - E. Guijarro-Estelles
- Centro de Investigación e Innovación en Bioingeniería, Universitat Politècnica de València, 46022, València, Spain
| | - A. Chornet-Lurbe
- Servicio de Neurofisiología Clínica, Hospital Lluís Alcanyís, departamento de salud Xàtiva-Ontinyent, 46800, Xàtiva, València, Spain
| | - S. Ballesta-Martinez
- Servicio de Neurofisiología Clínica, Hospital Lluís Alcanyís, departamento de salud Xàtiva-Ontinyent, 46800, Xàtiva, València, Spain
| | - M. Pardo-Hernandez
- Servicio de Neurofisiología Clínica, Hospital Lluís Alcanyís, departamento de salud Xàtiva-Ontinyent, 46800, Xàtiva, València, Spain
| | - Y. Ye-Lin
- Centro de Investigación e Innovación en Bioingeniería, Universitat Politècnica de València, 46022, València, Spain
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Implication of EEG theta/alpha and theta/beta ratio in Alzheimer's and Lewy body disease. Sci Rep 2022; 12:18706. [PMID: 36333386 PMCID: PMC9636216 DOI: 10.1038/s41598-022-21951-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 10/06/2022] [Indexed: 11/06/2022] Open
Abstract
We evaluated the patterns of quantitative electroencephalography (EEG) in patients with Alzheimer's disease (AD), Lewy body disease (LBD), and mixed disease. Sixteen patients with AD, 38 with LBD, 20 with mixed disease, and 17 control participants were recruited and underwent EEG. The theta/alpha ratio and theta/beta ratio were measured. The relationship of the log-transformed theta/alpha ratio (TAR) and theta/beta ratio (TBR) with the disease group, the presence of AD and LBD, and clinical symptoms were evaluated. Participants in the LBD and mixed disease groups had higher TBR in all lobes except for occipital lobe than those in the control group. The presence of LBD was independently associated with higher TBR in all lobes and higher central and parietal TAR, while the presence of AD was not. Among cognitively impaired patients, higher TAR was associated with the language, memory, and visuospatial dysfunction, while higher TBR was associated with the memory and frontal/executive dysfunction. Increased TBR in all lobar regions and temporal TAR were associated with the hallucinations, while cognitive fluctuations and the severity of Parkinsonism were not. Increased TBR could be a biomarker for LBD, independent of AD, while the presence of mixed disease could be reflected as increased TAR.
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Brak IV, Filimonova E, Zakhariya O, Khasanov R, Stepanyan I. Transcranial Current Stimulation as a Tool of Neuromodulation of Cognitive Functions in Parkinson’s Disease. Front Neurosci 2022; 16:781488. [PMID: 35903808 PMCID: PMC9314857 DOI: 10.3389/fnins.2022.781488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 04/28/2022] [Indexed: 11/13/2022] Open
Abstract
Decrease in cognitive function is one of the most common causes of poor life quality and early disability in patients with Parkinson’s disease (PD). Existing methods of treatment are aimed at both correction of motor and non-motor symptoms. Methods of adjuvant therapy (or complementary therapy) for maintaining cognitive functions in patients with PD are of interest. A promising subject of research in this regard is the method of transcranial electric current stimulation (tES). Here we reviewed the current understanding of the pathogenesis of cognitive impairment in PD and of the effects of transcranial direct current stimulation and transcranial alternating current stimulation on the cognitive function of patients with PD-MCI (Parkinson’s Disease–Mild Cognitive Impairment).
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Affiliation(s)
- Ivan V. Brak
- Laboratory of Comprehensive Problems of Risk Assessment to Population and Workers’ Health, Federal State Budgetary Scientific Institution “Izmerov Research Institute of Occupational Health”, Moscow, Russia
- “Engiwiki” Scientific and Engineering Projects Laboratory, Department of Information Technologies, Novosibirsk State University, Novosibirsk, Russia
- *Correspondence: Ivan V. Brak,
| | | | - Oleg Zakhariya
- Faculty of Philosophy, Lomonosov Moscow State University, Moscow, Russia
| | - Rustam Khasanov
- Faculty of Philosophy, Lomonosov Moscow State University, Moscow, Russia
- Independent Researcher, Novosibirsk, Russia
| | - Ivan Stepanyan
- Peoples’ Friendship University of Russia (RUDN University), Moscow, Russia
- Mechanical Engineering Research Institute of the Russian Academy of Sciences, Moscow, Russia
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Zhang J, Villringer A, Nikulin VV. Dopaminergic Modulation of Local Non-oscillatory Activity and Global-Network Properties in Parkinson’s Disease: An EEG Study. Front Aging Neurosci 2022; 14:846017. [PMID: 35572144 PMCID: PMC9106139 DOI: 10.3389/fnagi.2022.846017] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 03/31/2022] [Indexed: 11/13/2022] Open
Abstract
Dopaminergic medication for Parkinson’s disease (PD) modulates neuronal oscillations and functional connectivity (FC) across the basal ganglia-thalamic-cortical circuit. However, the non-oscillatory component of the neuronal activity, potentially indicating a state of excitation/inhibition balance, has not yet been investigated and previous studies have shown inconsistent changes of cortico-cortical connectivity as a response to dopaminergic medication. To further elucidate changes of regional non-oscillatory component of the neuronal power spectra, FC, and to determine which aspects of network organization obtained with graph theory respond to dopaminergic medication, we analyzed a resting-state electroencephalography (EEG) dataset including 15 PD patients during OFF and ON medication conditions. We found that the spectral slope, typically used to quantify the broadband non-oscillatory component of power spectra, steepened particularly in the left central region in the ON compared to OFF condition. In addition, using lagged coherence as a FC measure, we found that the FC in the beta frequency range between centro-parietal and frontal regions was enhanced in the ON compared to the OFF condition. After applying graph theory analysis, we observed that at the lower level of topology the node degree was increased, particularly in the centro-parietal area. Yet, results showed no significant difference in global topological organization between the two conditions: either in global efficiency or clustering coefficient for measuring global and local integration, respectively. Interestingly, we found a close association between local/global spectral slope and functional network global efficiency in the OFF condition, suggesting a crucial role of local non-oscillatory dynamics in forming the functional global integration which characterizes PD. These results provide further evidence and a more complete picture for the engagement of multiple cortical regions at various levels in response to dopaminergic medication in PD.
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Affiliation(s)
- Juanli Zhang
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
- Department of Neurology, Charité – Universitätsmedizin Berlin, Berlin, Germany
- *Correspondence: Juanli Zhang,
| | - Arno Villringer
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
- Department of Cognitive Neurology, University Hospital Leipzig, Leipzig, Germany
| | - Vadim V. Nikulin
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
- Neurophysics Group, Department of Neurology, Charité – Universitätsmedizin Berlin, Berlin, Germany
- Vadim V. Nikulin,
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Shirahige L, Berenguer-Rocha M, Mendonça S, Rocha S, Rodrigues MC, Monte-Silva K. Quantitative Electroencephalography Characteristics for Parkinson's Disease: A Systematic Review. JOURNAL OF PARKINSONS DISEASE 2021; 10:455-470. [PMID: 32065804 PMCID: PMC7242841 DOI: 10.3233/jpd-191840] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND Individualized treatment guided by biomarkers certainly will play a crucial role in the more effective treatment of various neurological diseases in the near future. Identifying the electroencephalographic biomarkers in the brain of patients with Parkinson's disease (PD) may help in the decision-making process of health professionals regarding the non-invasive brain stimulation (NIBS) protocols. OBJECTIVE To summarize quantitative electroencephalographic (qEEG) characteristics of patients with PD with motor symptoms at rest or during movement to identify potential biomarker associated with motor impairment in PD. METHODS A systematic search was conducted in the databases MEDLINE/PubMed, LILACS/BIREME, CINAHL/EBSCO, Web of Science, and CENTRAL, performed according to PRISMA-statement guidelines. Two independent authors searched for studies that reported qEEG data related to motor outcomes at rest or during movements in patients with PD and compared the data with control healthy group. The studies' methodological quality was examined using the Cochrane Handbook. Studies/sample characteristics, qEEG parameters/analyses, and the studies' results were summarized. Prospero-register: CRD42018085660. RESULTS Nineteen studies (18 cross-sectional/one cross-over) with 312 PD patients and 277 controls, published between 1994-2018, were included for the qualitative analysis. In comparison to healthy controls, our findings suggest a slowing down of the cortical activity in patients with PD due to an increase of slower band waves activity and a decrease of fast band waves at resting and during complex movement execution mainly in the central and frontal cortex. CONCLUSION Slowing down of cortical waves suggest excitatory NIBS for motor impairment in PD. However, qEEG biomarker for motor symptoms of PD cannot be established yet because the studies that related qEEG with motor outcomes presented methodological poor quality.
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Affiliation(s)
- Lívia Shirahige
- Applied Neuroscience Laboratory, Department of Physical Therapy, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.,Postgraduate Program in Neuropsychiatry and Behavioral Sciences, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Marina Berenguer-Rocha
- Applied Neuroscience Laboratory, Department of Physical Therapy, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Sarah Mendonça
- Postgraduate Program in Neuropsychiatry and Behavioral Sciences, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Sérgio Rocha
- Applied Neuroscience Laboratory, Department of Physical Therapy, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Marcelo Cairrão Rodrigues
- Neurodinamics Laboratory, Department of Physiology, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Kátia Monte-Silva
- Applied Neuroscience Laboratory, Department of Physical Therapy, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
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Cakir Y. Computational neuronal correlation with enhanced synchronized activity in the basal ganglia and the slowing of thalamic theta and alpha rhythms in Parkinson's disease. Eur J Neurosci 2021; 54:5203-5223. [PMID: 34192822 DOI: 10.1111/ejn.15374] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 06/19/2021] [Accepted: 06/19/2021] [Indexed: 11/27/2022]
Abstract
The aim of this work is computationally to correlate the synchronized neuronal activity of basal ganglia and slowing in theta and alpha rhythms in electroencephalogram (EEG) signal in thalamic region in case of dopamine depletion and decrease of synaptic connections. The used network topology is a scale-free network with constant node degree. The dopamine-modulated type Izikhevich neuron model is used for modeling the striatal region, consisting of fast-spiking interneurons, D1 and D2 type dopamine expressing medium spiny neurons. On the other hand, the ordinary Izikhevich neuron model is used in the modeling of extrastriatal basal ganglia (BG) regions where globus pallidus (GP) subregion neurons have also dopamine-dependent parameters. The thalamic region of the network is mass modeled including inhibitory input from basal ganglia. Depending on the decrease of synaptic connections and dopamine level, the synchronization among basal ganglia neuron populations is investigated. The effect of synaptic delay on synchronization is also considered. It is observed that the decrease of dopamine neurotransmitter and decrease in the number of synaptic connections cause an increased synchronous activity in BG. Also, slowing in theta and alpha bands in thalamus EEG signals is observed. This shows the causal relation between synchronization and power shifting to lower frequency components in the case of neurodegenerative diseases such as Parkinson's disease (PD).
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Affiliation(s)
- Yuksel Cakir
- Department of Electronics and Communication Engineering, Istanbul Technical University, Istanbul, Turkey
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Primary motor cortex in Parkinson's disease: Functional changes and opportunities for neurostimulation. Neurobiol Dis 2020; 147:105159. [PMID: 33152506 DOI: 10.1016/j.nbd.2020.105159] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 10/30/2020] [Accepted: 10/31/2020] [Indexed: 02/07/2023] Open
Abstract
Movement abnormalities of Parkinson's disease (PD) arise from disordered neural activity in multiple interconnected brain structures. The planning and execution of movement requires recruitment of a heterogeneous collection of pyramidal projection neurons in the primary motor cortex (M1). The neural representations of movement in M1 single-cell and field potential recordings are directly and indirectly influenced by the midbrain dopaminergic neurons that degenerate in PD. This review examines M1 functional alterations in PD as uncovered by electrophysiological recordings and neurostimulation studies in patients and experimental animal models. Dysfunction of the parkinsonian M1 depends on the severity and/or duration of dopamine-depletion and the species examined, and is expressed as alterations in movement-related firing dynamics; functional reorganisation of local circuits; and changes in field potential beta oscillations. Neurostimulation methods that modulate M1 activity directly (e.g., transcranial magnetic stimulation) or indirectly (subthalamic nucleus deep brain stimulation) improve motor function in PD patients, showing that targeted neuromodulation of M1 is a realistic therapy. We argue that the therapeutic profile of M1 neurostimulation is likely to be greatly enhanced with alternative technologies that permit cell-type specific control and incorporate feedback from electrophysiological biomarkers measured locally.
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Geraedts VJ, Boon LI, Marinus J, Gouw AA, van Hilten JJ, Stam CJ, Tannemaat MR, Contarino MF. Clinical correlates of quantitative EEG in Parkinson disease: A systematic review. Neurology 2018; 91:871-883. [PMID: 30291182 DOI: 10.1212/wnl.0000000000006473] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
OBJECTIVE To assess the relevance of quantitative EEG (qEEG) measures as outcomes of disease severity and progression in Parkinson disease (PD). METHODS Main databases were systematically searched (January 2018) for studies of sufficient methodologic quality that examined correlations between clinical symptoms of idiopathic PD and cortical (surface) qEEG metrics. RESULTS Thirty-six out of 605 identified studied were included. Results were classified into 4 domains: cognition (23 studies), motor function (13 studies), responsiveness to interventions (7 studies), and other (10 studies). In cross-sectional studies, EEG slowing correlated with global cognitive impairment and with diffuse deterioration in other domains. In longitudinal studies, decreased dominant frequency and increased θ power, reflecting EEG slowing, were biomarkers of cognitive deterioration at an individual level. Results on motor dysfunction and treatment yielded contrasting findings. Studies on functional connectivity at an individual level and longitudinal studies on other domains or on connectivity measures were lacking. CONCLUSION qEEG measures reflecting EEG slowing, particularly decreased dominant frequency and increased θ power, correlate with cognitive impairment and predict future cognitive deterioration. qEEG could provide reliable and widely available biomarkers for nonmotor disease severity and progression in PD, potentially promoting early diagnosis of nonmotor symptoms and an objective monitoring of progression. More studies are needed to clarify the role of functional connectivity and network analyses.
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Affiliation(s)
- Victor J Geraedts
- From the Department of Neurology (V.J.G., J.M., J.J.v.H., M.R.T., M.F.C.), Leiden University Medical Center; Department of Clinical Neurophysiology and MEG Center (V.J.G., L.I.B., A.A.G., C.J.S.) and Alzheimer Center, Department of Neurology (A.A.G.), VU University Medical Center, Amsterdam; and Department of Neurology (M.F.C.), Haga Teaching Hospital, The Hague, the Netherlands
| | - Lennard I Boon
- From the Department of Neurology (V.J.G., J.M., J.J.v.H., M.R.T., M.F.C.), Leiden University Medical Center; Department of Clinical Neurophysiology and MEG Center (V.J.G., L.I.B., A.A.G., C.J.S.) and Alzheimer Center, Department of Neurology (A.A.G.), VU University Medical Center, Amsterdam; and Department of Neurology (M.F.C.), Haga Teaching Hospital, The Hague, the Netherlands
| | - Johan Marinus
- From the Department of Neurology (V.J.G., J.M., J.J.v.H., M.R.T., M.F.C.), Leiden University Medical Center; Department of Clinical Neurophysiology and MEG Center (V.J.G., L.I.B., A.A.G., C.J.S.) and Alzheimer Center, Department of Neurology (A.A.G.), VU University Medical Center, Amsterdam; and Department of Neurology (M.F.C.), Haga Teaching Hospital, The Hague, the Netherlands
| | - Alida A Gouw
- From the Department of Neurology (V.J.G., J.M., J.J.v.H., M.R.T., M.F.C.), Leiden University Medical Center; Department of Clinical Neurophysiology and MEG Center (V.J.G., L.I.B., A.A.G., C.J.S.) and Alzheimer Center, Department of Neurology (A.A.G.), VU University Medical Center, Amsterdam; and Department of Neurology (M.F.C.), Haga Teaching Hospital, The Hague, the Netherlands
| | - Jacobus J van Hilten
- From the Department of Neurology (V.J.G., J.M., J.J.v.H., M.R.T., M.F.C.), Leiden University Medical Center; Department of Clinical Neurophysiology and MEG Center (V.J.G., L.I.B., A.A.G., C.J.S.) and Alzheimer Center, Department of Neurology (A.A.G.), VU University Medical Center, Amsterdam; and Department of Neurology (M.F.C.), Haga Teaching Hospital, The Hague, the Netherlands
| | - Cornelis J Stam
- From the Department of Neurology (V.J.G., J.M., J.J.v.H., M.R.T., M.F.C.), Leiden University Medical Center; Department of Clinical Neurophysiology and MEG Center (V.J.G., L.I.B., A.A.G., C.J.S.) and Alzheimer Center, Department of Neurology (A.A.G.), VU University Medical Center, Amsterdam; and Department of Neurology (M.F.C.), Haga Teaching Hospital, The Hague, the Netherlands
| | - Martijn R Tannemaat
- From the Department of Neurology (V.J.G., J.M., J.J.v.H., M.R.T., M.F.C.), Leiden University Medical Center; Department of Clinical Neurophysiology and MEG Center (V.J.G., L.I.B., A.A.G., C.J.S.) and Alzheimer Center, Department of Neurology (A.A.G.), VU University Medical Center, Amsterdam; and Department of Neurology (M.F.C.), Haga Teaching Hospital, The Hague, the Netherlands.
| | - Maria Fiorella Contarino
- From the Department of Neurology (V.J.G., J.M., J.J.v.H., M.R.T., M.F.C.), Leiden University Medical Center; Department of Clinical Neurophysiology and MEG Center (V.J.G., L.I.B., A.A.G., C.J.S.) and Alzheimer Center, Department of Neurology (A.A.G.), VU University Medical Center, Amsterdam; and Department of Neurology (M.F.C.), Haga Teaching Hospital, The Hague, the Netherlands
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Gribanov AV, Dzhos YS, Deryabina IN, Deputat IS, Yemelianova TV. [An aging brain: morphofunctional aspects]. Zh Nevrol Psikhiatr Im S S Korsakova 2017; 117:3-7. [PMID: 28514328 DOI: 10.17116/jnevro2017117123-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A review of main results in the field that are relevant for understanding of the clinical pathology developed in old age is presented. The authors focus attention on the characteristics of atrophic processes and their severity in different brain structures including cognitive impairment (memory etc). Correlations between structural changes in brain tissues and neurochemical and bioelectrical processes in the CNS are discussed.
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Affiliation(s)
- A V Gribanov
- Northern Federal University named after M.V. Lomonosov, Arkhangelsk, Russia
| | - Yu S Dzhos
- Northern Federal University named after M.V. Lomonosov, Arkhangelsk, Russia
| | - I N Deryabina
- Northern Federal University named after M.V. Lomonosov, Arkhangelsk, Russia
| | - I S Deputat
- Northern Federal University named after M.V. Lomonosov, Arkhangelsk, Russia
| | - T V Yemelianova
- Northern Federal University named after M.V. Lomonosov, Arkhangelsk, Russia
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Vardy AN, van Wegen EE, Kwakkel G, Berendse HW, Beek PJ, Daffertshofer A. Slowing of M1 activity in Parkinson’s disease during rest and movement – An MEG study. Clin Neurophysiol 2011; 122:789-95. [DOI: 10.1016/j.clinph.2010.10.034] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Revised: 10/11/2010] [Accepted: 10/24/2010] [Indexed: 11/25/2022]
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Pugnetti L, Baglio F, Farina E, Alberoni M, Calabrese E, Gambini A, Di Bella E, Garegnani M, Deleonardis L, Nemni R. EEG Evidence of Posterior Cortical Disconnection in PD and Related Dementias. Int J Neurosci 2010; 120:88-98. [DOI: 10.3109/00207450903436346] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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12
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Moazami-Goudarzi M, Sarnthein J, Michels L, Moukhtieva R, Jeanmonod D. Enhanced frontal low and high frequency power and synchronization in the resting EEG of parkinsonian patients. Neuroimage 2008; 41:985-97. [DOI: 10.1016/j.neuroimage.2008.03.032] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2007] [Revised: 02/28/2008] [Accepted: 03/17/2008] [Indexed: 10/22/2022] Open
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13
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Vorobyov VV, Schibaev NV, Morelli M, Carta AR. EEG modifications in the cortex and striatum after dopaminergic priming in the 6-hydroxydopamine rat model of Parkinson's disease. Brain Res 2003; 972:177-85. [PMID: 12711091 DOI: 10.1016/s0006-8993(03)02528-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
In rats bearing a unilateral 6-hydroxydopamine (6-OHDA) lesion of the medial forebrain bundle, a single administration of a dopamine receptor agonist (priming) sensitizes the behavioral motor responses to a dopaminergic agonist, administered 3 days after priming. In this study, changes in the electroencephalogram (EEG) frequency spectra were evaluated during priming in unilaterally 6-OHDA-lesioned rats, implanted bilaterally with electrodes both in the somatosensory cortex and striatum. Two weeks after 6-OHDA lesion, rats were primed with apomorphine (0.2 mg/kg) and received a challenge with the D(1) agonist SKF 38393 (3 mg/kg) 3 days later. 6-OHDA lesion modified the EEG pattern mainly in the beta(1) frequency band, in both cortex and striatum. Apomorphine priming produced a power decrease in the beta(1) frequency band, more pronounced in the cortex than in the striatum, as compared to saline-treated rats. Antagonism of NMDA receptor with MK-801, a treatment known to block the development of priming, increased apomorphine inhibitory effect mainly in the striatum, producing the same degree of inhibition in the two structures. Administration of SKF 38393, 3 days after priming, caused a power decrease in beta(1) frequency band of the cortex and striatum, which was more pronounced in apomorphine-primed as compared to drug-naive rats. The inhibitory effect of SKF 38393 was enhanced in rats primed with MK-801 plus apomorphine, particularly in the striatum. The results of this study suggest that long-term changes in the electrical activity of cortex and striatum after priming, might contribute to the development of the behavioral sensitization observed after priming. Development of priming might be related to the degree and cortical/striatal ratio of EEG power inhibition produced by dopamine agonists.
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Affiliation(s)
- Vasily V Vorobyov
- Institute of Cell Biophysics, Russian Academy of Sciences, 142290 Pushchino, Moscow Region, Russia
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Roth C, Jeanmonod D, Magnin M, Morel A, Achermann P. Effects of medial thalamotomy and pallido-thalamic tractotomy on sleep and waking EEG in pain and Parkinsonian patients. Clin Neurophysiol 2000; 111:1266-75. [PMID: 10880802 DOI: 10.1016/s1388-2457(00)00295-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES Investigation of sleep and sleep EEG before and after stereotactic neurosurgery. METHODS All-night polysomnographic recordings were obtained in 3 neurogenic pain patients and 3 parkinsonian patients. One subject of each group was recorded in addition 3 months after surgery. Stereotactic operations were performed in the medial thalamus and on the pallido-thalamic tract to relieve neurogenic pain and parkinsonian symptoms, respectively. RESULTS Sleep efficiency was little affected by the surgical intervention in neurogenic pain patients and a dramatic reduction in REM sleep occurred, which had recovered in the subject recorded after 3 months. After the surgery parkinsonian patients showed an increase in total sleep time and in sleep efficiency, and a decrease in REM sleep latency. Sleep efficiency remained elevated in the 3 months follow-up. Medial thalamotomy abolished spindle frequency activity (SFA) in the power and coherence spectra in non-REM sleep stage 2 systematically. Pallido-thalamic tractotomy attenuated SFA only to varying degrees. After 3 months SFA had reemerged. The alpha peak of the waking EEG was shifted to lower frequencies after surgery in 5 of 6 patients and had reverted to the original frequency 3 months later. CONCLUSIONS Medial thalamotomy or pallido-thalamic tractotomy had acute and reversible effects on the EEG and long-term deleterious side effects of stereotactic surgery on sleep and sleep EEG are improbable. The results provide further evidence for the involvement of the human thalamus in the generation of sleep spindles.
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Affiliation(s)
- C Roth
- Institute of Pharmacology and Toxicology, University of Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland
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