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Shibata T, Musha T, Kosugi Y, Kubo M, Horie Y, Kuwayama N, Kuroda S, Hayashi K, Kobayashi Y, Tanaka M, Matsuzaki H, Nemoto K, Asada T. Altered Neuronal Activity Topography Markers in the Elderly with Increased Atherosclerosis. Front Aging Neurosci 2017; 9:216. [PMID: 28729833 PMCID: PMC5498522 DOI: 10.3389/fnagi.2017.00216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 06/20/2017] [Indexed: 11/13/2022] Open
Abstract
Background: Previously, we reported on vascular cognitive impairment (VCI) templates, consisting of patients with VCI associated with carotid stenosis (>60%) using a quantitative electroencephalographic (EEG) technique called neuronal activity topography (NAT). Here using the VCI templates, we investigated the hypothesis that internal carotid artery-intima-media thickness (ICA-IMT) is associated with EEG spectrum intensity (sNAT) and spectrum steepness (vNAT). Methods: A total of 221 community-dwelling elderly subjects were recruited. Four groups were classified according to quartiles of ICA-IMT as assessed by ultrasonography: control group A, normal (≤0.9 mm); group B, mild atherosclerosis (1-1.1 mm); group C, moderate atherosclerosis (1.2-1.8 mm); and group D, severe atherosclerosis (≥1.9 mm). EEG markers of power ratio index (PRI), and the binary likelihood of being in the VCI group vs. the that of being in control group A (sL x:VCI-A , vL x:VCI-A ) were assessed, respectively. Differences in mean total scores for PRI, sL x:VCI-A , vL x:VCI-A , between control group A and the other groups were compared using Dunnett's test, respectively. Results: The mean total scores of the PRI were 3.25, 3.00, 2.77, and 2.26 for groups A, B, C, and D, respectively. There was a significant decrease in the PRI in group D compared with group A (P = 0.0066). The mean total scores of the sL x:VCI-A were -0.14, -0.11, -0.1, and -0.03 for groups A, B, C, and D, respectively. The sL x:VCI-A in group D was significantly higher compared to that in group A (P < 0.0001). The mean total scores of the vL x:VCI-A were -0.04,-0.01, 0.01, and 0.06 for group A, B, C, and D, respectively. The vL x:VCI-A in group D and group C was significantly higher compared to that in group A, respectively (P < 0.0001, P = 0.02). Conclusion: Community-dwelling elderly subjects in the increased carotid atherosclerosis of ICA-IMT (≥1.9 mm) were at greatest risk of an EEG change as assessed by NAT.
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Affiliation(s)
- Takashi Shibata
- Department of Neurosurgery, Stroke Center, Saiseikai Toyama HospitalToyama, Japan
| | | | | | - Michiya Kubo
- Department of Neurosurgery, Stroke Center, Saiseikai Toyama HospitalToyama, Japan
| | - Yukio Horie
- Department of Neurosurgery, Stroke Center, Saiseikai Toyama HospitalToyama, Japan
| | - Naoya Kuwayama
- Department of Neurosurgery, Graduate School of Medicine and Pharmacological Science, University of ToyamaToyama, Japan
| | - Satoshi Kuroda
- Department of Neurosurgery, Graduate School of Medicine and Pharmacological Science, University of ToyamaToyama, Japan
| | - Karin Hayashi
- Department of Neuropsychiatry, Toho University Medical Center Sakura HospitalChiba, Japan
| | | | | | - Haruyasu Matsuzaki
- Brain Functions Laboratory Inc.Yokohama, Japan.,Department of Medical Course, Teikyo Heisei UniversityTokyo, Japan
| | - Kiyotaka Nemoto
- Department of Neuropsychiatry, Institute of Clinical Medicine, University of TsukubaTsukuba, Japan
| | - Takashi Asada
- Department of Neuropsychiatry, University of Tokyo Medical and Dental UniversityTokyo, Japan
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Sakamoto S, Ikeda H, Tsuyuguchi N, Uda T, Okumura E, Asakawa T, Haruta Y, Nishiyama H, Okada T, Kamada H, Ohata K, Miki Y. MEG Frequency Analysis Depicts the Impaired Neurophysiological Condition of Ischemic Brain. PLoS One 2016; 11:e0168588. [PMID: 27992543 PMCID: PMC5161380 DOI: 10.1371/journal.pone.0168588] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 12/02/2016] [Indexed: 11/18/2022] Open
Abstract
PURPOSE Quantitative imaging of neuromagnetic fields based on automated region of interest (ROI) setting was analyzed to determine the characteristics of cerebral neural activity in ischemic areas. METHODS Magnetoencephalography (MEG) was used to evaluate spontaneous neuromagnetic fields in the ischemic areas of 37 patients with unilateral internal carotid artery (ICA) occlusive disease. Voxel-based time-averaged intensity of slow waves was obtained in two frequency bands (0.3-4 Hz and 4-8 Hz) using standardized low-resolution brain electromagnetic tomography (sLORETA) modified for a quantifiable method (sLORETA-qm). ROIs were automatically applied to the anterior cerebral artery (ACA), anterior middle cerebral artery (MCAa), posterior middle cerebral artery (MCAp), and posterior cerebral artery (PCA) using statistical parametric mapping (SPM). Positron emission tomography with 15O-gas inhalation (15O-PET) was also performed to evaluate cerebral blood flow (CBF) and oxygen extraction fraction (OEF). Statistical analyses were performed using laterality index of MEG and 15O-PET in each ROI with respect to distribution and intensity. RESULTS MEG revealed statistically significant laterality in affected MCA regions, including 4-8 Hz waves in MCAa, and 0.3-4 Hz and 4-8 Hz waves in MCAp (95% confidence interval: 0.020-0.190, 0.030-0.207, and 0.034-0.213), respectively. We found that 0.3-4 Hz waves in MCAp were highly correlated with CBF in MCAa and MCAp (r = 0.74, r = 0.68, respectively), whereas 4-8 Hz waves were moderately correlated with CBF in both the MCAa and MCAp (r = 0.60, r = 0.63, respectively). We also found that 4-8 Hz waves in MCAp were statistically significant for misery perfusion identified on 15O-PET (p<0.05). CONCLUSIONS Quantitatively imaged spontaneous neuromagnetic fields using the automated ROI setting enabled clear depiction of cerebral ischemic areas. Frequency analysis may reveal unique neural activity that is distributed in the impaired vascular metabolic territory, in which the cerebral infarction has not yet been completed.
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Affiliation(s)
- Shinichi Sakamoto
- Department of Diagnostic and Interventional Radiology, Osaka City University Graduate School of Medicine, Osaka, Japan
- * E-mail:
| | - Hidetoshi Ikeda
- Department of Neurosurgery, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Naohiro Tsuyuguchi
- Department of Neurosurgery, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Takehiro Uda
- Department of Neurosurgery, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Eiichi Okumura
- Medical Imaging Business Department, Ricoh Company, Ltd., Kanazawa, Japan
| | - Takashi Asakawa
- Medical Imaging Business Department, Ricoh Company, Ltd., Kanazawa, Japan
| | - Yasuhiro Haruta
- Applied Electronics Laboratory, Kanazawa Institute of Technology, Kanazawa, Japan
| | | | - Toyoji Okada
- Department of Clinical Laboratory, Hokuto Hospital, Obihiro, Japan
| | - Hajime Kamada
- Department of Neurosurgery, Hokuto Hospital, Obihiro, Japan
| | - Kenji Ohata
- Department of Neurosurgery, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Yukio Miki
- Department of Diagnostic and Interventional Radiology, Osaka City University Graduate School of Medicine, Osaka, Japan
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Hsiao FJ, Hsieh FY, Chen WT, Chu DC, Lin YY. Altered Resting-State Cortical EEG Oscillations in Patients With Severe Asymptomatic Carotid Stenosis. Clin EEG Neurosci 2016; 47:142-9. [PMID: 25465434 DOI: 10.1177/1550059414560396] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 10/27/2014] [Indexed: 11/16/2022]
Abstract
Asymptomatic carotid stenosis is characterized by altered cerebral hemodynamics and cognitive impairment, but the underlying neurophysiological mechanism remains unclear. To elucidate the alterations of cortical activities, resting-state electrophysiological activities were recorded from patients with mild (<30%; n=10; age 57-85 years), moderate (30% to 50%; n=11; age 66-88 years), and severe (>50%; n=8; age 67-91 years) carotid stenosis. The current density and oscillatory power of the cortical sources were analyzed using the minimum norm estimates method combined with fast Fourier transform analysis. Our results indicate that the cortical current density among regions of the brain was similar, irrespective of the degree of carotid stenosis. With regard to the cortical oscillations, augmented theta activities in the bilateral parietal, left temporal, and left occipital regions and attenuated alpha activities in the bilateral frontal and right central regions were obtained in patients with severe asymptomatic carotid stenosis. We suggest that the source-based cortical oscillations at theta and alpha bands might reflect the alterations of the brain activities and characterize the altered neurophysiological mechanism of the brain with at least 50% occlusion of the carotid artery. Further longitudinal studies with larger populations are warranted to verify the present findings.
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Affiliation(s)
- Fu-Jung Hsiao
- Brain Research Center, National Yang-Ming University, Taipei, Taiwan Institute of Brain Science, National Yang-Ming University, Taipei, Taiwan Department of Education and Research, Taipei City Hospital, Taipei, Taiwan Department of Neurology, Taipei City Hospital, Taipei, Taiwan Laboratory of Neurophysiology, Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Fang-Yuh Hsieh
- Department of Education and Research, Taipei City Hospital, Taipei, Taiwan
| | - Wei-Ta Chen
- Brain Research Center, National Yang-Ming University, Taipei, Taiwan Institute of Brain Science, National Yang-Ming University, Taipei, Taiwan Department of Neurosurgery, Taipei City Hospital, Taipei, Taiwan Laboratory of Neurophysiology, Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Da-Chen Chu
- Department of Neurology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Yung-Yang Lin
- Brain Research Center, National Yang-Ming University, Taipei, Taiwan Institute of Brain Science, National Yang-Ming University, Taipei, Taiwan Department of Neurology, Taipei City Hospital, Taipei, Taiwan Department of Neurosurgery, Taipei City Hospital, Taipei, Taiwan Laboratory of Neurophysiology, Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan
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Sakamoto S, Tanaka H, Tsuyuguchi N, Terakawa Y, Ohata K, Inoue Y, Miki Y, Hara M, Takahashi Y, Nitta K, Sawa H, Satone A, Ide W, Hashimoto I, Kamada H. Quantitative imaging of spontaneous neuromagnetic activity for assessing cerebral ischemia using sLORETA-qm. Neuroimage 2009; 49:488-97. [PMID: 19632340 DOI: 10.1016/j.neuroimage.2009.07.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2009] [Revised: 07/15/2009] [Accepted: 07/20/2009] [Indexed: 10/20/2022] Open
Abstract
To image cerebral neural activity in ischemic areas, we proposed a novel technique to analyze spontaneous neuromagnetic fields based on standardized low-resolution brain electromagnetic tomography modified for a quantifiable method (sLORETA-qm). Using a 160-channel whole-head-type magnetoencephalographic system, cerebral magnetic fields were obtained pre- and postoperatively from 5 patients with unilateral internal carotid artery occlusive disease and 16 age-matched healthy volunteers. For quantitative imaging, voxel-based time-averaged intensities of slow waves in 4 frequency bands (0.3-2 Hz, 2-4 Hz, 4-6 Hz and 6-8 Hz) were obtained by the proposed technique based on sLORETA-qm. Positron emission tomography with (15)O gas inhalation ((15)O-PET) was also performed in these patients to evaluate cerebral blood flow and metabolism. In all 5 patients, slow waves in every frequency band were distributed in the area of cerebrovascular insufficiency, as confirmed by (15)O-PET preoperatively. In 4 patients, slow-wave intensities in theta bands (4-6 Hz, 6-8 Hz) decreased postoperatively along with improvements in cerebral blood flow and metabolism, whereas delta bands (0.3-2 Hz, 2-4 Hz) showed no significant differences between pre- and postoperatively. One patient with deterioration of cerebral infarction after surgery showed marked increases in slow-wave intensities in delta bands (0.3-2 Hz, 2-4 Hz) postoperatively, with distribution close to the infarct region. The proposed quantitative imaging of spontaneous neuromagnetic fields enabled clear visualization and alternations of cerebral neural conditions in the ischemic area. This technique may offer a novel, non-invasive method for identifying cerebral ischemia, although further studies in a larger number of patients are warranted.
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Ohtomo S, Nakasato N, Shimizu H, Seki S, Kanno A, Kumabe T, Tominaga T. Temporo-parietal theta activity correlates with misery perfusion in arterial occlusive disease. Clin Neurophysiol 2009; 120:1227-34. [DOI: 10.1016/j.clinph.2009.05.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2008] [Revised: 04/24/2009] [Accepted: 05/19/2009] [Indexed: 11/28/2022]
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Sakamoto S, Ide W, Hashimoto I, Kamada H, Tanaka H, Sekihara K. Recovery of spontaneous neuromagnetic activity after extracranial-intracranial bypass in a patient with middle cerebral artery occlusion. Acta Neurochir (Wien) 2008; 150:1285-90; discussion 1290. [PMID: 19015808 DOI: 10.1007/s00701-008-0156-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2007] [Accepted: 05/29/2008] [Indexed: 11/29/2022]
Abstract
PATIENT AND METHODS Cerebral blood flow and neuromagnetic activity were measured using (123)I-iodoamphetamine-single photon emission computed tomography (IMP-SPECT) and magnetoencephalography (MEG), before and after extracranial-intracranial (EC-IC) bypass surgery in a 55-year-old woman with unilateral middle cerebral artery occlusion that occurred with intraventricular haemorrhage. Frequency analysis of slow waves measured on MEG was performed using an adaptive beam-former method. RESULTS AND DISCUSSION Distribution of delta waves was observed pre-operatively corresponding to areas of cerebral hypo-perfusion as confirmed by IMP-SPECT but disappeared post-operatively with improvements in cerebral blood flow. Imaging of slow-wave distributions with MEG may represent a new technique for identifying cerebral ischaemia.
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