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Nakamura K, Hoshi H, Kobayashi M, Fukasawa K, Ichikawa S, Shigihara Y. Dorsal brain activity reflects the severity of menopausal symptoms. Menopause 2024; 31:399-407. [PMID: 38626372 DOI: 10.1097/gme.0000000000002347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2024]
Abstract
OBJECTIVE The severity of menopausal symptoms, despite being triggered by hormonal imbalance, does not directly correspond to hormone levels in the blood; thus, the level of unpleasantness is assessed using subjective questionnaires in clinical practice. To provide better treatments, alternative objective assessments have been anticipated to support medical interviews and subjective assessments. This study aimed to develop a new objective measurement for assessing unpleasantness. METHODS Fourteen participants with menopausal symptoms and two age-matched participants who visited our outpatient section were enrolled. Resting-state brain activity was measured using magnetoencephalography. The level of unpleasantness of menopausal symptoms was measured using the Kupperman Kohnenki Shogai Index. The blood level of follicle-stimulating hormone and luteinizing hormone were also measured. Correlation analyses were performed between the oscillatory power of brain activity, index score, and hormone levels. RESULTS The level of unpleasantness of menopausal symptoms was positively correlated with high-frequency oscillatory powers in the parietal and bordering cortices (alpha; P = 0.016, beta; P = 0.015, low gamma; P = 0.010). The follicle-stimulating hormone blood level was correlated with high-frequency oscillatory powers in the dorsal part of the cortex (beta; P = 0.008, beta; P = 0.005, low gamma; P = 0.017), whereas luteinizing hormone blood level was not correlated. CONCLUSION Resting-state brain activity can serve as an objective measurement of unpleasantness associated with menopausal symptoms, which aids the selection of appropriate treatment and monitors its outcome.
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Affiliation(s)
| | - Hideyuki Hoshi
- Precision Medicine Centre, Hokuto Hospital, Kisen-7-5 Inadacho, Obihiro, Hokkaido, 080-0833, Japan
| | - Momoko Kobayashi
- Precision Medicine Centre, Kumagaya General Hospital, 4 Chome-5-1 Nakanishi, Kumagaya, Saitama, 360-8567, Japan
| | - Keisuke Fukasawa
- Clinical Laboratory, Kumagaya General Hospital, 4 Chome-5-1 Nakanishi, Kumagaya, Saitama, 360-8567, Japan
| | - Sayuri Ichikawa
- Clinical Laboratory, Kumagaya General Hospital, 4 Chome-5-1 Nakanishi, Kumagaya, Saitama, 360-8567, Japan
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Livny A, Golan Y, Itzhaki N, Grossberg D, Tsarfaty G, Bondi M, Zeilig G, Defrin R. Higher Regional Gray Matter Volume and White Matter Integrity in Individuals With Central Neuropathic Pain After Spinal Cord Injury. J Neurotrauma 2024; 41:836-843. [PMID: 37937697 DOI: 10.1089/neu.2023.0146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2023] Open
Abstract
Spinal cord injury (SCI) is a debilitating neurological condition that often leads to central neuropathic pain (CNP). As the fundamental mechanism of CNP is not fully established, its management is one of the most challenging problems among people with SCI. To shed more light on CNP mechanisms, the aim of this cross-sectional study was to compare the brain structure between individuals with SCI and CNP and those without CNP by examining the gray matter (GM) volume and the white matter (WM) integrity. Fifty-two individuals with SCI-28 with CNP and 24 without CNP-underwent a magnetic resonance imaging (MRI) session, including a T1-weighted scan for voxel-based morphometry, and a diffusion-weighted imaging (DWI) scan for WM integrity analysis, as measured by fractional anisotropy (FA) and mean diffusivity (MD). We found significantly higher GM volume in individuals with CNP compared with pain-free individuals in the right superior (p < 0.0014) and middle temporal gyri (p < 0.0001). Moreover, individuals with CNP exhibited higher WM integrity in the splenium of the corpus callosum (p < 0.0001) and in the posterior cingulum (p < 0.0001), compared with pain-free individuals. The results suggest that the existence of CNP following SCI is associated with GM and WM structural abnormalities in regions involved in pain intensification and spread, and which may reflect maladaptive neural plasticity in CNP.
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Affiliation(s)
- Abigail Livny
- Division of Diagnostic Imaging, Sheba Medical Center, Tel HaShomer, Israel
- Faculty of Medicine, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
- Sagol Neuroscience School, Tel Aviv University, Tel Aviv, Israel
| | - Yael Golan
- Division of Diagnostic Imaging, Sheba Medical Center, Tel HaShomer, Israel
| | - Nofar Itzhaki
- Division of Diagnostic Imaging, Sheba Medical Center, Tel HaShomer, Israel
| | - Dafna Grossberg
- Faculty of Medicine, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
- Rehabilitation Ambulatory Department, Sheba Medical Center, Tel HaShomer, Israel
| | - Galia Tsarfaty
- Division of Diagnostic Imaging, Sheba Medical Center, Tel HaShomer, Israel
- Faculty of Medicine, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Moshe Bondi
- Faculty of Medicine, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
- Department of Neurological Rehabilitation, Sheba Medical Center, Tel HaShomer, Israel
| | - Gabriel Zeilig
- Faculty of Medicine, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
- Department of Neurological Rehabilitation, Sheba Medical Center, Tel HaShomer, Israel
- School of Health Professions, Ono Academic College, Kiryat Ono, Israel
| | - Ruth Defrin
- Sagol Neuroscience School, Tel Aviv University, Tel Aviv, Israel
- Department of Physical Therapy, Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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Gamma-band oscillations of pain and nociception: A systematic review and meta-analysis of human and rodent studies. Neurosci Biobehav Rev 2023; 146:105062. [PMID: 36682424 DOI: 10.1016/j.neubiorev.2023.105062] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 01/08/2023] [Accepted: 01/18/2023] [Indexed: 01/22/2023]
Abstract
Pain-induced gamma-band oscillations (GBOs) are one of the most promising biomarkers of the pain experience. Although GBOs reliably encode pain perception across different individuals and species, considerable heterogeneity could be observed in the characteristics and functions of GBOs. However, such heterogeneity of GBOs and its underlying sources have rarely been detailed previously. Here, we conducted a systematic review and meta-analysis to characterize the temporal, frequential, and spatial characteristics of GBOs and summarize the functional significance of distinct GBOs. We found that GBO heterogeneity was mainly related to pain types, with a higher frequency (∼66 Hz) GBOs at the sensorimotor cortex elicited by phasic pain and a lower frequency (∼55 Hz) GBOs at the prefrontal cortex associated with tonic and chronic pains. Positive correlations between GBO magnitudes and pain intensity were observed in healthy participants. Notably, the characteristics and functions of GBOs seemed to be phylogenetically conserved across humans and rodents. Altogether, we provided a comprehensive description of heterogeneous GBOs in pain and nociception, laying the foundation for clinical applications of GBOs.
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Kobayashi H, Tominaga R, Otani K, Sekiguchi M, Nikaido T, Watanabe K, Kato K, Yabuki S, Konno SI. Lumbar spinal stenosis is a risk factor for the development of dementia: locomotive syndrome and health outcomes in the Aizu cohort study. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2023; 32:488-494. [PMID: 35962870 DOI: 10.1007/s00586-022-07318-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 05/28/2022] [Accepted: 07/04/2022] [Indexed: 10/15/2022]
Abstract
PURPOSE It remains unclear whether musculoskeletal diseases are risk factors for dementia development. This prospective cohort study of community-dwelling residents aimed to clarify the impact of lumbar spinal stenosis (LSS) on dementia development. METHODS We included participants aged ≥ 65 years from the Locomotive Syndrome and Health Outcomes in the Aizu cohort study. LSS was diagnosed using the validated LSS diagnostic support tool. Dementia development between 2008 and 2015 was investigated using official long-term care insurance certification data. We analysed the effects of LSS on dementia development after adjusting for potential confounders, like age, sex, diabetes, depressive symptoms, hip and knee joint osteoarthritis, daily activity, and smoking habit. RESULTS We included 1220 patients in the final analysis. The incidence of dementia was significantly higher in the LSS group [48 of 444 (10.8%)] than in the control group [34 of 776 (4.4%)]. Multivariable analysis using multiple imputations revealed that the confidence interval for the adjusted odds ratio of LSS for dementia development was 1.87 (95% confidence interval; 1.14-3.07). CONCLUSION We clarified that LSS is an independent risk factor for dementia development. Our findings suggest the importance of considering the risk of dementia in the decision-making process for the treatment of LSS.
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Affiliation(s)
- Hiroshi Kobayashi
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, 1-Hikarigaoka, Fukushima City, 960-1295, Japan.
| | - Ryoji Tominaga
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, 1-Hikarigaoka, Fukushima City, 960-1295, Japan
| | - Koji Otani
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, 1-Hikarigaoka, Fukushima City, 960-1295, Japan
| | - Miho Sekiguchi
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, 1-Hikarigaoka, Fukushima City, 960-1295, Japan
| | - Takuya Nikaido
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, 1-Hikarigaoka, Fukushima City, 960-1295, Japan
| | - Kazuyuki Watanabe
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, 1-Hikarigaoka, Fukushima City, 960-1295, Japan
| | - Kinshi Kato
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, 1-Hikarigaoka, Fukushima City, 960-1295, Japan
| | - Shoji Yabuki
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, 1-Hikarigaoka, Fukushima City, 960-1295, Japan
| | - Shin-Ichi Konno
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, 1-Hikarigaoka, Fukushima City, 960-1295, Japan
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Wang M, Tang X, Li B, Wan T, Zhu X, Zhu Y, Lai X, He Y, Xia G. Dynamic local metrics changes in patients with toothache: A resting-state functional magnetic resonance imaging study. Front Neurol 2022; 13:1077432. [PMID: 36578304 PMCID: PMC9790921 DOI: 10.3389/fneur.2022.1077432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Accepted: 11/28/2022] [Indexed: 12/14/2022] Open
Abstract
Objective To study the dynamic changes of local metrics in patients with toothache (TA, Toothache) in the resting state, in order to further understand the changes of central neural mechanism in patients with dental pain and its effect on cognition and emotion. Methods Thirty patients with TA and thirty matched healthy (HC) control volunteers were recruited, and resting-state functional magnetic resonance (rs-MRI) scans were performed on all subjects, and data were analyzed to compare group differences in three dynamic local indices: dynamic regional homogeneity (dReHO), dynamic low-frequency fluctuation amplitude (dALFF) and dynamic fractional low-frequency fluctuation amplitude (dfALFF). In addition, the association between dynamic local metrics in different brain regions of TA patients and scores on the Visual Analog Scale (VAS) and the Hospital Anxiety and Depression Scale (HADS) was investigated by Pearson correlation analysis. Results In this study, we found that The local metrics of TA patients changed with time Compared with the HC group, TA patients showed increased dReHo values in the left superior temporal gyrus, middle frontal gyrus, precentral gyrus, precuneus, angular gyrus, right superior frontal gyrus, middle temporal gyrus, postcentral gyrus and middle frontal gyrus, increased dALFF values in the right superior frontal gyrus, and increased dfALFF values in the right middle temporal gyrus, middle frontal gyrus and right superior occipital gyrus (p < 0.01, cluster level P < 0.05). Pearson correlation analysis showed that dReHo values of left precuneus and left angular gyrus were positively correlated with VAS scores in TA group. dReHo value of right posterior central gyrus was positively correlated with HADS score (P < 0.05). Conclusion There are differences in the patterns of neural activity changes in resting-state brain areas of TA patients, and the brain areas that undergo abnormal changes are mainly pain processing brain areas, emotion processing brain areas and pain cognitive modulation brain areas, which help to reveal their underlying neuropathological mechanisms. In the hope of further understanding its effects on cognition and emotion.
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Affiliation(s)
- Mengting Wang
- Medical Imaging Center, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Xin Tang
- Medical Imaging Center, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Bin Li
- Medical Imaging Center, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Tianyi Wan
- Medical Imaging Center, Jiangxi Provincial People's Hospital, Nanchang, China
| | - Xuechao Zhu
- Medical Imaging Center, Jiangxi Cancer Hospital, Nanchang, China
| | - Yuping Zhu
- Medical Imaging Center, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Xunfu Lai
- Medical Imaging Center, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Yulin He
- Medical Imaging Center, The First Affiliated Hospital of Nanchang University, Nanchang, China,*Correspondence: Yulin He
| | - Guojin Xia
- Medical Imaging Center, The First Affiliated Hospital of Nanchang University, Nanchang, China,Guojin Xia
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Zhou Z, Hui ES, Kranz GS, Chang JR, de Luca K, Pinto SM, Chan WW, Yau SY, Chau BK, Samartzis D, Jensen MP, Wong AYL. Potential mechanisms underlying the accelerated cognitive decline in people with chronic low back pain: A scoping review. Ageing Res Rev 2022; 82:101767. [PMID: 36280211 DOI: 10.1016/j.arr.2022.101767] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 09/13/2022] [Accepted: 10/20/2022] [Indexed: 01/31/2023]
Abstract
A growing body of evidence has shown that people with chronic low back pain (CLBP) demonstrate significantly greater declines in multiple cognitive domains than people who do not have CLBP. Given the high prevalence of CLBP in the ever-growing aging population that may be more vulnerable to cognitive decline, it is important to understand the mechanisms underlying the accelerated cognitive decline observed in this population, so that proper preventive or treatment approaches can be developed and implemented. The current scoping review summarizes what is known regarding the potential mechanisms underlying suboptimal cognitive performance and cognitive decline in people with CLBP and discusses future research directions. Five potential mechanisms were identified based on the findings from 34 included studies: (1) altered activity in the cortex and neural networks; (2) grey matter atrophy; (3) microglial activation and neuroinflammation; (4) comorbidities associated with CLBP; and (5) gut microbiota dysbiosis. Future studies should deepen the understanding of mechanisms underlying this association so that proper prevention and treatment strategies can be developed.
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Affiliation(s)
- Zhixing Zhou
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China
| | - Edward S Hui
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China
| | - Georg S Kranz
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China; Department of Psychiatry and Psychotherapy, Medical University of Vienna, Austria; The State Key Laboratory of Brain and Cognitive Sciences, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China
| | - Jeremy R Chang
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China
| | - Katie de Luca
- School of Health, Medical and Applied Sciences, CQ University, Brisbane, Australia
| | - Sabina M Pinto
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China
| | - Winnie Wy Chan
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China
| | - Suk-Yu Yau
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China; Research Institute of Smart Ageing, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China
| | - Bolton Kh Chau
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China
| | - Dino Samartzis
- Department of Orthopedic Surgery, Rush University Medical Centre, Chicago, IL, USA
| | - Mark P Jensen
- Department of Rehabilitation Medicine, University of Washington, Seattle, WA, USA
| | - Arnold Y L Wong
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China; Research Institute of Smart Ageing, The Hong Kong Polytechnic University, Hong Kong Special Adminstrative Region, China.
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Kato Y, Yachi K, Hoshi H, Okada T, Shigihara Y. Two Distinct Neural Mechanisms Underlying Acupuncture Analgesia. FRONTIERS IN PAIN RESEARCH 2022; 3:869884. [PMID: 35663250 PMCID: PMC9159800 DOI: 10.3389/fpain.2022.869884] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Accepted: 04/28/2022] [Indexed: 11/13/2022] Open
Abstract
Acupuncture analgesia is a traditional treatment with a long history, although it lacks scientific evidence. It is reportedly associated with the central nervous system, including various brain regions, from the cortices to the brain stem. However, it remains unclear whether the distributed regions behave as a single unit or consist of multiple sub-units playing different roles. Magnetoencephalography is a neuroimaging technique that can measure the oscillatory frequency of neural signals and brain regions. The frequency band of neural signals allows further understanding of the characteristics of the acupuncture-related neural systems. This study measured resting-state brain activity using magnetoencephalography in 21 individuals with chronic pain before and after acupuncture treatment. The subjective level of pain was assessed using a visual analog scale, and brain activity was compared to identify the brain regions and the frequencies associated with acupuncture analgesia. Here, we categorized the changes in resting-state brain activity into two groups: low-frequency oscillatory activity (<3 Hz) in the left middle occipital and right superior partial lobule and high-frequency oscillatory activity (81–120 Hz) on both sides of the prefrontal, primary sensory, and right fusiform gyri. These findings suggest that acupuncture analgesia influences two or more sub-units of the neural systems, which helps us understand the neural mechanisms underlying acupuncture analgesia.
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Affiliation(s)
- Yasutaka Kato
- Department of Pathology and Genetics, Hokuto Hospital, Obihiro, Japan
- Acupuncture Centre, Hokuto Hospital, Obihiro, Japan
| | - Kazuhiro Yachi
- Acupuncture Centre, Hokuto Hospital, Obihiro, Japan
- Acupuncture Clinic Kaikido, Sapporo, Japan
| | - Hideyuki Hoshi
- Precision Medicine Centre, Hokuto Hospital, Obihiro, Japan
| | - Toyoji Okada
- Clinical Laboratory, Hokuto Hospital, Obihiro, Japan
| | - Yoshihito Shigihara
- Precision Medicine Centre, Hokuto Hospital, Obihiro, Japan
- *Correspondence: Yoshihito Shigihara
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Habituation of Somatosensory Evoked Potentials in Patients with Alzheimer’s Disease and Those with Vascular Dementia. Medicina (B Aires) 2021; 57:medicina57121364. [PMID: 34946308 PMCID: PMC8708528 DOI: 10.3390/medicina57121364] [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: 11/11/2021] [Revised: 12/09/2021] [Accepted: 12/10/2021] [Indexed: 11/21/2022] Open
Abstract
Background and Objectives: The most prevalent dementia are Alzheimer’s disease and vascular dementia. There is evidence that cortical synaptic function may differ in these two conditions. Habituation of cortical responses to repeated stimuli is a well-preserved phenomenon in a normal brain cortex, related to an underlying mechanism of synaptic efficacy regulation. Lack of habituation represents a marker of synaptic dysfunction. The purpose of this study was to assess the habituation of somatosensory evoked potentials (SEPs) in 29 patients affected by mild-to-moderate Alzheimer’s disease (AD-type) or vascular (VD-type) dementia. Materials and Methods: All patients underwent a clinical history interview, neuropsychological evaluation, and neuroimaging examination. SEPs were elicited by electrical stimulation of the right median nerve at the wrist. Six-hundred stimuli were delivered, and cortical responses divided in three blocks of 200. Habituation was calculated by measuring changes of N20 amplitude from block 1 to block 3. SEP variables recorded in patients were compared with those recorded in 15 age- and gender-matched healthy volunteers. Results: SEP recordings showed similar N20 amplitudes in AD-type and VD-type patients in block 1, that were higher than those recorded in controls. N20 amplitude decreased from block 1 to block 3 (habituation) in normal subjects and in VD-type patients, whereas in AD-type patients it remained unchanged (lack of habituation). Conclusions: The findings suggest that neurophysiologic mechanisms of synaptic efficacy that underneath habituation are impaired in patients with AD-type dementia but not in patients with VD-type dementia. SEPs habituation may contribute to early distinction of Alzheimer’s disease vs. vascular dementia.
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Tanoue Y, Uda T, Hoshi H, Shigihara Y, Kawashima T, Nakajo K, Tsuyuguchi N, Goto T. Specific Oscillatory Power Changes and Their Efficacy for Determining Laterality in Mesial Temporal Lobe Epilepsy: A Magnetoencephalographic Study. Front Neurol 2021; 12:617291. [PMID: 33633670 PMCID: PMC7900569 DOI: 10.3389/fneur.2021.617291] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 01/21/2021] [Indexed: 01/22/2023] Open
Abstract
Appropriate determination of the epileptic focus and its laterality are important for the diagnosis of mesial temporal lobe epilepsy (MTLE). The aims of this study are to establish a specific oscillatory distribution and laterality of the oscillatory power in unilateral MTLE with frequency analysis of magnetoencephalography (MEG), and to confirm their potential to carry significant information for determining lateralization of the epileptic focus. Thirty-five patients with MTLE [left (LtMTLE), 16; right (RtMTLE), 19] and 102 healthy control volunteers (CTR) were enrolled. Cortical oscillatory powers were compared among the groups by contrasting the source images using a one-way ANOVA model for each frequency band. Further, to compare the lateralization of regional oscillatory powers between LtMTLEs and RtMTLEs, the laterality index (LI) was calculated for four brain regions (frontal, temporal, parietal, and occipital) in each frequency band, which were compared between patient groups (LtMTLE, RtMTLE, and CTR), and used for machine learning prediction of the groups with support vector machine (SVM) with linear kernel function. Significant oscillatory power differences between MTLE and CTR were found in certain areas. In the theta to high-frequency oscillation bands, there were marked increases in the parietal lobe, especially on the left side, in LtMTLE. In the theta, alpha, and high-gamma bands, there were marked increases in the parietal lobe, especially on the right side in RtMTLE. Compared with CTR, LIs were significantly higher in 24/28 regions in LtMTLE, but lower in 4/28 regions and higher in 10/28 regions in RtMTLE. LI at the temporal lobe in the theta band was significantly higher in LtMTLE and significantly lower in RtMTLE. Comparing LtMTLE and RtMTLE, there were significant LI differences in most regions and frequencies (21/28 regions). In all frequency bands, there were significant differences between LtMTLE and RtMTLE in the temporal and parietal lobes. The leave-one-out cross-validation of the linear-SVM showed the classification accuracy to be over 91%, where the model had high specificity over 96% and mild sensitivity ~68–75%. Using MEG frequency analysis, the characteristics of the oscillatory power distribution in the MTLE were demonstrated. Compared with CTR, LIs shifted to the side of the epileptic focus in the temporal lobe in the theta band. The machine learning approach also confirmed that LIs have significant predictive ability in the lateralization of the epileptic focus. These results provide useful additional information for determining the laterality of the focus.
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Affiliation(s)
- Yuta Tanoue
- Department of Neurosurgery, Graduate School of Medicine, Osaka City University, Osaka, Japan
| | - Takehiro Uda
- Department of Neurosurgery, Graduate School of Medicine, Osaka City University, Osaka, Japan
| | - Hideyuki Hoshi
- Precision Medicine Centre, Hokuto Hospital, Obihiro City, Japan
| | - Yoshihito Shigihara
- Precision Medicine Centre, Hokuto Hospital, Obihiro City, Japan.,Precision Medicine Centre, Kumagaya General Hospital, Kumagaya, Japan
| | - Toshiyuki Kawashima
- Department of Neurosurgery, Graduate School of Medicine, Osaka City University, Osaka, Japan
| | - Kosuke Nakajo
- Department of Neurosurgery, Graduate School of Medicine, Osaka City University, Osaka, Japan
| | - Naohiro Tsuyuguchi
- Department of Neurosurgery, Graduate School of Medicine, Osaka City University, Osaka, Japan.,Department of Neurosurgery, Faculty of Medicine, Kindai University, Osaka, Japan
| | - Takeo Goto
- Department of Neurosurgery, Graduate School of Medicine, Osaka City University, Osaka, Japan
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