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Zou X, He J, Zhou M, Zhao F, Tian X, Xu X, Hong W, Wang F, Chen J, Qin C, Xia J, Xie Y, Xiao Y, Liu K, Guo L. Photophobia and Visual Triggers in Vestibular Migraine. Neurol Ther 2024; 13:1191-1201. [PMID: 38819614 PMCID: PMC11263323 DOI: 10.1007/s40120-024-00631-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Accepted: 05/09/2024] [Indexed: 06/01/2024] Open
Abstract
INTRODUCTION Vestibular migraine (VM) is a prevalent vestibular disorder characterized by episodic vertigo. However, the relationship between photophobia and visual triggers in VM remains unexplored. We investigated the correlation of photophobia during the VM attack with interictal photosensitivity and visually triggering dizziness in patients with VM. METHODS We enrolled patients diagnosed with VM, with or without photophobia, across seven specialized vertigo and headache clinics in China. Healthy individuals were also included as a control group. Using a cross-sectional survey design, we collected data related to light intensity and dizziness frequency triggered by flicker, glare, and eyestrain using the Headache Triggers Sensitivity and Avoidance Questionnaire. RESULTS A total of 366 patients were recruited. The photosensitivity and frequency of dizziness induced by flicker, glare, and eyestrain observed in patients with VM and photophobia were significantly elevated compared with those in patients without photophobia and control participants (P < 0.001). A significant positive correlation was observed between photosensitivity levels and dizziness frequency triggered by flicker, glare, and eyestrain in patients with VM and photophobia (P < 0.001). CONCLUSIONS This study unequivocally established a positive association of ictal photophobia with interictal photosensitivity and visually triggering dizziness, strongly advocating the need for further research on exposure-based therapies for managing VM. CLINICAL TRIALS REGISTRATION ClinicalTrial.gov Identifier, NCT04939922, retrospectively registered, 14th June 2021.
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Affiliation(s)
- Xiaodong Zou
- Department of Neurology, Tongde Hospital of Zhejiang Province, Hangzhou, 310012, Zhejiang, China
- Key Laboratory of Cancer Prevention and Therapy Combining Traditional Chinese and Western Medicine of Zhejiang Province, Hangzhou, 310012, Zhejiang, China
| | - Jiahui He
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Mengting Zhou
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Fangling Zhao
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Xiulin Tian
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Xiaopei Xu
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China
| | - Wenwu Hong
- Department of Neurology, Tiantai People's Hospital of Zhejiang Province, Tiantai, 317200, Zhejiang, China
| | - Faming Wang
- Department of Neurology, Tiantai People's Hospital of Zhejiang Province, Tiantai, 317200, Zhejiang, China
| | - Juanyan Chen
- Department of Neurology, Dongyang People's Hospital, Dongyang, 322103, Zhejiang, China
| | - Chenghui Qin
- Department of Neurology, Affiliated Hospital of Shaoxing University, Shaoxing, 312099, Zhejiang, China
| | - Jinjin Xia
- Department of Neurology, Changxing People's Hospital of Zhejiang Province, Changxing, 313199, Zhejiang, China
| | - Yuying Xie
- Department of Neurology, Shanghang County Hospital, Shanghang, 364299, Fujian, China
| | - Yujin Xiao
- Department of Neurology, Jiaxing Hospital of Traditional Chinese Medicine, Jiaxing, 314033, Zhejiang, China
| | - Kaiming Liu
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310003, Zhejiang, China.
| | - Liang Guo
- Department of Ophthalmology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China.
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Cho LY, Bell TK, Craddock L, Godfrey KJ, Hershey AD, Kuziek J, Stokoe M, Millar K, Orr SL, Harris AD. Region-specific changes in brain glutamate and gamma-aminobutyric acid across the migraine attack in children and adolescents. Pain 2024:00006396-990000000-00619. [PMID: 38833578 DOI: 10.1097/j.pain.0000000000003289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 04/21/2024] [Indexed: 06/06/2024]
Abstract
ABSTRACT In patients with migraine, an excitation-inhibition imbalance that fluctuates relative to attack onset has been proposed to contribute to the underlying pathophysiology of migraine, but this has yet to be explored in children and adolescents. This prospective, observational, cohort study examined glutamate and gamma-aminobutyric acid (GABA) levels across the phases of a migraine attack and interictally in children and adolescents using magnetic resonance spectroscopy. Macromolecule-suppressed GABA (sensorimotor cortex and thalamus) and glutamate (occipital cortex, sensorimotor cortex, and thalamus) were measured in children and adolescents (10-17 years) with a migraine diagnosis with or without aura 4 times over 2 weeks. Linear mixed-effects models examined changes in glutamate and GABA during the 72 hours leading up to, and after the onset of an attack. We found significant region-specific changes in glutamate and GABA. Specifically, sensorimotor GABA significantly increased leading up to the headache phase, whereas glutamate significantly decreased following the headache onset in the occipital cortex and the thalamus. Post hoc analyses examined the 24 hours leading up to or following the onset of the headache phase. In the 24 hours before the headache onset, sensorimotor glutamate, occipital glutamate, and thalamic GABA decreased. In the 24 hours post headache onset, sensorimotor glutamate continued to decrease. Our results suggest changes in glutamate and GABA that are consistent with the thalamocortical dysrhythmia hypothesis. These findings provide insight into developmental migraine pathophysiology and may open future avenues for treatment targets specific to children and adolescents.
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Affiliation(s)
- Lydia Y Cho
- Department of Radiology, University of Calgary, Calgary, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Canada
| | - Tiffany K Bell
- Department of Radiology, University of Calgary, Calgary, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Canada
| | - Lindsay Craddock
- Vi Riddell Pain and Rehab Center, Alberta Children's Hospital Calgary, Canada
- Department of Nursing, University of Calgary, Calgary, Canada
| | - Kate J Godfrey
- Department of Radiology, University of Calgary, Calgary, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Canada
| | - Andrew D Hershey
- Division of Neurology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States
- Department of Pediatrics, University of Cincinnati School of Medicine, Cincinnati, Ohio, United States
| | - Jonathan Kuziek
- Hotchkiss Brain Institute, University of Calgary, Calgary, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Canada
- Departments of Pediatrics, Community Health Sciences, and Clinical Neurosciences, University of Calgary, Calgary, Canada
| | - Mehak Stokoe
- Department of Radiology, University of Calgary, Calgary, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Canada
| | - Kayla Millar
- Department of Radiology, University of Calgary, Calgary, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Canada
| | - Serena L Orr
- Hotchkiss Brain Institute, University of Calgary, Calgary, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Canada
- Departments of Pediatrics, Community Health Sciences, and Clinical Neurosciences, University of Calgary, Calgary, Canada
| | - Ashley D Harris
- Department of Radiology, University of Calgary, Calgary, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Canada
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Chaliha DR, Vaccarezza M, Charng J, Chen FK, Lim A, Drummond P, Takechi R, Lam V, Dhaliwal SS, Mamo JCL. Using optical coherence tomography and optical coherence tomography angiography to delineate neurovascular homeostasis in migraine: a review. Front Neurosci 2024; 18:1376282. [PMID: 38686331 PMCID: PMC11057254 DOI: 10.3389/fnins.2024.1376282] [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: 01/25/2024] [Accepted: 03/26/2024] [Indexed: 05/02/2024] Open
Abstract
Migraine is one of the world's most debilitating disorders, and it has recently been shown that changes in the retina can be a potential biomarker for the disease. These changes can be detected by optical coherence tomography (OCT), which measures retinal thickness, and optical coherence tomography angiography (OCTA), which measures vessel density. We searched the databases Google Scholar, ProQuest, Scopus, and Web of Science for studies in English using OCT and OCTA in migraineurs, using the search terms "optical coherence tomography," "OCT," "optical coherence tomography angiography," "OCTA" and "migraine." We found 73 primary studies, 11 reviews, and 8 meta-analyses pertaining to OCT and OCTA findings in migraineurs. They showed that migraineurs had reduced retinal thickness (via OCT), retinal vessel density, and greater foveal avascular zone area (via OCTA) than controls. OCTA changes reflect a perfusion compromise occurring in migraineurs as opposed to in healthy controls. OCT and OCTA deficits were worse in migraine-with-aura and chronic migraine than in migraine-without-aura and episodic migraine. Certain areas of the eye, such as the fovea, may be more vulnerable to these perfusion changes than other parts. Direct comparison between study findings is difficult because of the heterogeneity between the studies in terms of both methodology and analysis. Moreover, as almost all case-control studies were cross-sectional, more longitudinal cohort studies are needed to determine cause and effect between migraine pathophysiology and OCT/OCTA findings. Current evidence suggests both OCT and OCTA may serve as retinal markers for migraineurs, and further research in this field will hopefully enable us to better understand the vascular changes associated with migraine, perhaps also providing a new diagnostic and therapeutic biomarker.
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Affiliation(s)
- Devahuti R. Chaliha
- Faculty of Health Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth, WA, Australia
- Faculty of Health Sciences, School of Population Health, Curtin University, Perth, WA, Australia
| | - Mauro Vaccarezza
- Faculty of Health Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth, WA, Australia
- Faculty of Health Sciences, Curtin Medical School, Curtin University, Perth, WA, Australia
| | - Jason Charng
- Centre for Ophthalmology and Visual Sciences (Lions Eye Institute), The University of Western Australia, Perth, WA, Australia
- Department of Optometry, School of Allied Health, The University of Western Australia, Perth, WA, Australia
| | - Fred K. Chen
- Centre for Ophthalmology and Visual Sciences (Lions Eye Institute), The University of Western Australia, Perth, WA, Australia
- Ophthalmology, Department of Surgery, University of Melbourne, Melbourne, VIC, Australia
| | - Amy Lim
- Department of Optometry, School of Allied Health, The University of Western Australia, Perth, WA, Australia
| | - Peter Drummond
- Centre for Healthy Ageing, Health Futures Institute, Murdoch University, Perth, WA, Australia
| | - Ryusuke Takechi
- Faculty of Health Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth, WA, Australia
- Faculty of Health Sciences, School of Population Health, Curtin University, Perth, WA, Australia
- Perron Institute Neurological and Translational Sciences, Perth, WA, Australia
| | - Virginie Lam
- Faculty of Health Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth, WA, Australia
- Faculty of Health Sciences, School of Population Health, Curtin University, Perth, WA, Australia
- Perron Institute Neurological and Translational Sciences, Perth, WA, Australia
| | - Satvinder S. Dhaliwal
- Faculty of Health Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth, WA, Australia
- Duke-NUS Medical School, National University of Singapore, Singapore, Singapore
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, Gelugor, Pulau Pinang, Malaysia
- Singapore University of Social Sciences, Singapore, Singapore
| | - John C. L. Mamo
- Faculty of Health Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth, WA, Australia
- Faculty of Health Sciences, School of Population Health, Curtin University, Perth, WA, Australia
- Perron Institute Neurological and Translational Sciences, Perth, WA, Australia
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Reyes N, Huang JJ, Choudhury A, Pondelis N, Locatelli EVT, Hollinger R, Felix ER, Pattany PM, Galor A, Moulton EA. FL-41 Tint Reduces Activation of Neural Pathways of Photophobia in Patients with Chronic Ocular Pain. Am J Ophthalmol 2024; 259:172-184. [PMID: 38101593 PMCID: PMC10939838 DOI: 10.1016/j.ajo.2023.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 10/17/2023] [Accepted: 12/07/2023] [Indexed: 12/17/2023]
Abstract
PURPOSE To assess the therapeutic effect of tinted lenses (FL-41) on photophobia and light-evoked brain activity using functional magnetic resonance imaging (fMRI) in individuals with chronic ocular surface pain. DESIGN Prospective case series. METHODS 25 subjects from the Miami veterans affairs (VA) eye clinic were recruited based on the presence of chronic ocular pain, dry eye symptoms, and photophobia. Using a 3T MRI scanner, subjects underwent 2 fMRI scans using an event-related design based on light stimuli: one scan while wearing FL-41 lenses and one without. Unpleasantness ratings evoked by the light stimuli were collected after each scan. RESULTS With FL-41 lenses, subjects reported decreased (n = 19), maintained (n = 2), or increased (n = 4) light-evoked unpleasantness ratings. Group analysis at baseline (no lens) revealed significant light evoked responses in bilateral primary somatosensory (S1), bilateral secondary somatosensory (S2), bilateral insula, bilateral frontal pole, visual, precuneus, paracingulate, and anterior cingulate cortices (ACC) as well as cerebellar vermis, bilateral cerebellar hemispheric lobule VI, and bilateral cerebellar crus I and II. With FL-41 lenses, light-evoked responses were significantly decreased in bilateral S1, bilateral S2, bilateral insular, right temporal pole, precuneus, ACC, and paracingulate cortices as well as bilateral cerebellar hemispheric lobule VI. CONCLUSION FL-41 lenses modulated photophobia symptoms in some individuals with chronic ocular pain. In conjunction, FL-41 lenses decreased activation in cortical areas involved in processing affective and sensory-discriminative dimensions of pain. Further research into these relationships will advance the ability to provide precision therapy for individuals with ocular pain.
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Affiliation(s)
- Nicholas Reyes
- Surgical Services, Miami Veterans Administration Medical Center (N.R., J.J.H., A.C., E.V.T.L., R.H., A.G.), Miami, Florida, USA; Bascom Palmer Eye Institute, University of Miami (N.R., J.J.H., A.C., E.V.T.L., A.G.), Miami, Florida, USA
| | - Jaxon J Huang
- Surgical Services, Miami Veterans Administration Medical Center (N.R., J.J.H., A.C., E.V.T.L., R.H., A.G.), Miami, Florida, USA; Bascom Palmer Eye Institute, University of Miami (N.R., J.J.H., A.C., E.V.T.L., A.G.), Miami, Florida, USA
| | - Anjalee Choudhury
- Surgical Services, Miami Veterans Administration Medical Center (N.R., J.J.H., A.C., E.V.T.L., R.H., A.G.), Miami, Florida, USA; Bascom Palmer Eye Institute, University of Miami (N.R., J.J.H., A.C., E.V.T.L., A.G.), Miami, Florida, USA
| | - Nicholas Pondelis
- Brain and Eye Pain Imaging Lab, Pain and Affective Neuroscience Center, Department of Anesthesia (N.P., E.A.M.), Critical Care and Pain Medicine, Boston Children's Hospital, Harvard Medical School, Massachusetts, USA
| | - Elyana V T Locatelli
- Surgical Services, Miami Veterans Administration Medical Center (N.R., J.J.H., A.C., E.V.T.L., R.H., A.G.), Miami, Florida, USA; Bascom Palmer Eye Institute, University of Miami (N.R., J.J.H., A.C., E.V.T.L., A.G.), Miami, Florida, USA
| | - Ruby Hollinger
- Surgical Services, Miami Veterans Administration Medical Center (N.R., J.J.H., A.C., E.V.T.L., R.H., A.G.), Miami, Florida, USA
| | - Elizabeth R Felix
- Research Service, Miami Veterans Administration Medical Center (E.R.F.), Miami, Florida, USA; Physical Medicine and Rehabilitation (E.R.F.), University of Miami, Miami, Florida, USA
| | - Pradip M Pattany
- Department of Radiology (P.M.P.), University of Miami, Miami, Florida, USA
| | - Anat Galor
- Surgical Services, Miami Veterans Administration Medical Center (N.R., J.J.H., A.C., E.V.T.L., R.H., A.G.), Miami, Florida, USA; Bascom Palmer Eye Institute, University of Miami (N.R., J.J.H., A.C., E.V.T.L., A.G.), Miami, Florida, USA
| | - Eric A Moulton
- Brain and Eye Pain Imaging Lab, Pain and Affective Neuroscience Center, Department of Anesthesia (N.P., E.A.M.), Critical Care and Pain Medicine, Boston Children's Hospital, Harvard Medical School, Massachusetts, USA; Department of Ophthalmology (E.A.M.), Boston Children's Hospital, Harvard Medical School, Massachusetts, USA.
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Chou BC, Lerner A, Barisano G, Phung D, Xu W, Pinto SN, Sheikh-Bahaei N. Functional MRI and Diffusion Tensor Imaging in Migraine: A Review of Migraine Functional and White Matter Microstructural Changes. J Cent Nerv Syst Dis 2023; 15:11795735231205413. [PMID: 37900908 PMCID: PMC10612465 DOI: 10.1177/11795735231205413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Accepted: 09/14/2023] [Indexed: 10/31/2023] Open
Abstract
Migraine is a complex and heterogenous disorder whose disease mechanisms remain disputed. This narrative review summarizes functional MRI (fMRI) and diffusion tensor imaging (DTI) findings and interprets their association with migraine symptoms and subtype to support and expand our current understanding of migraine pathophysiology. Our PubMed search evaluated and included fMRI and DTI studies involving comparisons between migraineurs vs healthy controls, migraineurs with vs without aura, and episodic vs chronic migraineurs. Migraineurs demonstrate changes in functional connectivity (FC) and regional activation in numerous pain-related networks depending on migraine phase, presence of aura, and chronicity. Changes to diffusion indices are observed in major cortical white matter tracts extending to the brainstem and cerebellum, more prominent in chronic migraine and associated with FC changes. Reported changes in FC and regional activation likely relate to pain processing and sensory hypersensitivities. Diffuse white matter microstructural changes in dysfunctional cortical pain and sensory pathways complement these functional differences. Interpretations of reported fMRI and DTI measure trends have not achieved a clear consensus due to inconsistencies in the migraine neuroimaging literature. Future fMRI and DTI studies should establish and implement a uniform methodology that reproduces existing results and directly compares migraineurs with different subtypes. Combined fMRI and DTI imaging may provide better pathophysiological explanations for nonspecific FC and white matter microstructural differences.
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Affiliation(s)
- Brendon C. Chou
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Alexander Lerner
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | | | - Daniel Phung
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Wilson Xu
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Soniya N. Pinto
- Department of Diagnostic Imaging, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Nasim Sheikh-Bahaei
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
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Ashina S, Melo-Carrillo A, Toluwanimi A, Bolo N, Szabo E, Borsook D, Burstein R. Galcanezumab effects on incidence of headache after occurrence of triggers, premonitory symptoms, and aura in responders, non-responders, super-responders, and super non-responders. J Headache Pain 2023; 24:26. [PMID: 36927366 PMCID: PMC10018924 DOI: 10.1186/s10194-023-01560-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 03/03/2023] [Indexed: 03/18/2023] Open
Abstract
BACKGROUND The goal of this observational, open-label, cohort study was to determine whether prophylactic migraine treatment with galcanezumab, a peripherally acting drug, alters the incidence of premonitory symptoms, and/or occurrence of headache after exposure to triggers or aura episodes in treatment-responders (≥ 50% reduction in monthly migraine days [MMD]), super-responders (≥ 70%), non-responders (< 50%) and super non-responders (< 30%). METHODS Participants were administered electronic daily headache diaries to document migraine days and associated symptoms one month before and during the three months of treatment. Questionnaires were used to identify conscious prodromal and trigger events that were followed by headache prior to vs. after 3 months of treatment. RESULTS After 3 months of galcanezumab treatment, (a) the incidence of premonitory symptoms that were followed by headache decreased by 48% in the 27 responders vs. 28% in the 19 non-responders, and by 50% in the 11 super-responders vs. 12% in the 8 super non-responders; (b) the incidence of visual and sensory aura that were followed by headache was reduced in responders, non-responders, and super-responders, but not in super non-responders; (c) the number of triggers followed by headache decreased by 38% in responders vs. 13% in non-responders, and by 31% in super-responders vs. 4% in super non-responders; and (d) some premonitory symptoms (e.g., cognitive impairment, irritability, fatigue) and triggers (e.g., stress, sleeping too little, bright light, aura) were followed by headache only in super non-responders. CONCLUSIONS Mechanistically, these findings suggest that even a mild decrease in migraine frequency is sufficient to partially reverse the excitability and responsivity of neurons involved in the generation of certain triggers and potentially premonitory symptoms of migraine. TRIAL REGISTRATION ClinicalTrials.gov: NCT04271202. Registration date: February 10, 2020.
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Affiliation(s)
- Sait Ashina
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA.,Department of Anesthesia, Harvard Medical School, Boston, MA, USA.,Comprehensive Headache Center, Beth Israel Deaconess Medical Center, Boston, MA, USA.,Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - Agustin Melo-Carrillo
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA.,Department of Anesthesia, Harvard Medical School, Boston, MA, USA
| | - Ajayi Toluwanimi
- Clinical Research Center, Beth Israel Deaconess Medical Boston, Boston, MA, USA
| | - Nicolas Bolo
- Departments of Psychiatry, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Edina Szabo
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA.,Department of Anesthesia, Harvard Medical School, Boston, MA, USA
| | - David Borsook
- Departments of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Departments of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Rami Burstein
- Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA. .,Department of Anesthesia, Harvard Medical School, Boston, MA, USA. .,Center for Life Science, Room 649, 3 Blackfan Circle, Boston, MA, 02215, USA.
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Tazi S, Boulanouar AK, Cassagne M, Fournié P, Malecaze J, Payoux P, Malecaze F, Cohen L. Abnormal brain function in photophobic patients with dry eye disease: An fMRI study. Rev Neurol (Paris) 2023. [PMID: 36863903 DOI: 10.1016/j.neurol.2022.11.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
BACKGROUND AND OBJECTIVES Photophobia, a frequent and disabling symptom observed in various neurological conditions and eye diseases, is thought to involve maladaptive brain functioning. We assessed this hypothesis, using functional magnetic resonance imaging (fMRI) in photophobic patients with minimal-to-severe dry eye disease (DED), as compared to healthy controls. METHODS This prospective, monocentric, comparative, cohort study included eleven photophobic DED patients compared to eight controls. Photophobic patients had a complete evaluation of DED to exclude any other cause of photophobia. All participants were scanned with fMRI under intermittent light stimulation with a LED lamp (27s. ON, 27 s. OFF), and cerebral activations were studied with univariate contrasts between the ON and OFF conditions, and with functional connectivity methods. RESULTS Firstly, stimulation activated the occipital cortex more strongly in patients than in controls. Moreover, stimulation deactivated the superior temporal cortex in patients less than in controls. Secondly, functional connectivity analysis showed that light stimulation induced lesser decoupling between the occipital cortex and the salience and visual networks in patients than in controls. DISCUSSION The current data shows that DED patients with photophobia have maladaptive brain anomalies. There is hyperactivity in the cortical visual system, associated with abnormal functional interactions, both within the visual cortex, and between visual areas and salience control mechanisms. Such anomalies show similarities with other conditions such as tinnitus, hyperacusis, and neuropathic pain. Those findings support novel neurally oriented methods for the care of patients with photophobia.
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Affiliation(s)
- S Tazi
- Ophthalmology Department, Purpan Hospital, Toulouse, France
| | - A K Boulanouar
- Toulouse NeuroImaging Center, Inserm, Toulouse University, UPS, 31024 Toulouse, France
| | - M Cassagne
- Ophthalmology Department, Purpan Hospital, Toulouse, France; UDEAR, Inserm, University of Toulouse III, U1056, Toulouse, France
| | - P Fournié
- Ophthalmology Department, Purpan Hospital, Toulouse, France; UDEAR, Inserm, University of Toulouse III, U1056, Toulouse, France
| | - J Malecaze
- Ophthalmology Department, Clermont-Ferrand Hospital, Clermont-Ferrand, France
| | - P Payoux
- Toulouse NeuroImaging Center, Inserm, Toulouse University, UPS, 31024 Toulouse, France
| | - F Malecaze
- Ophthalmology Department, Purpan Hospital, Toulouse, France
| | - L Cohen
- Inserm U 1127, CNRS UMR 7225, Sorbonne universités, UPMC University of Paris 06 UMR S 1127, Institut du cerveau, ICM, 75013 Paris, France; Hôpital de la Pitié Salpêtrière, Féderation de neurologie, AP-HP, 75013 Paris, France.
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Dong B, Ji S, Li Y, Li H, Yang R, Yang N, Liu Z, Zhu C, Wang H, Tang Y, Peng A, Chen L. Connection between right-to-left shunt and photosensitivity: a community-based cross-sectional study. Front Neurol 2023; 14:1177879. [PMID: 37181560 PMCID: PMC10172477 DOI: 10.3389/fneur.2023.1177879] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 04/03/2023] [Indexed: 05/16/2023] Open
Abstract
Background Hypersensitivity to light is a common symptom associated with dysfunction of the occipital region. Earlier studies also suggested that clinically significant right-to-left shunt (RLS) could increase occipital cortical excitability associated with the occurrence of migraine. The aim of this study was to investigate the relationship between RLS and photosensitivity. Methods This cross-sectional observational study included the residents aged 18-55 years living in the Mianzhu community between November 2021 and October 2022. Photosensitivity was evaluated using the Photosensitivity Assessment Questionnaire along with baseline clinical data through face-to-face interviews. After the interviews, contrast-transthoracic echocardiography (cTTE) was performed to detect RLS. Inverse probability weighting (IPW) was used to reduce selection bias. Photosensitivity score was compared between individuals with and without significant RLS using multivariable linear regression based on IPW. Results A total of 829 participants containing 759 healthy controls and 70 migraineurs were finally included in the analysis. Multivariable linear regression analysis showed that migraine (β = 0.422; 95% CI: 0.086-0.759; p = 0.014) and clinically significant RLS (β = 1.115; 95% CI: 0.760-1.470; p < 0.001) were related to higher photosensitivity score. Subgroup analysis revealed that clinically significant RLS had a positive effect on hypersensitivity to light in the healthy population (β = 0.763; 95% CI: 0.332-1.195; p < 0.001) or migraineurs (β = 1.459; 95% CI: 0.271-2.647; p = 0.010). There was also a significant interaction between RLS and migraine for the association with photophobia (pinteraction = 0.009). Conclusion RLS is associated with photosensitivity independently and might exacerbate photophobia in migraineurs. Future studies with RLS closure are needed to validate the findings. Trial registration This study was registered at the Chinese Clinical Trial Register, Natural Population Cohort Study of West China Hospital of Sichuan University, ID: ChiCTR1900024623, URL: https://www.chictr.org.cn/showproj.html?proj=40590.
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Affiliation(s)
- Bosi Dong
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, China
| | - Shuming Ji
- Department of Clinical Research Management, West China Hospital, Sichuan University, Chengdu, China
| | - Yajiao Li
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Hua Li
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, China
| | - Ruiqi Yang
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, China
| | - Na Yang
- Department of Clinical Research Management, West China Hospital, Sichuan University, Chengdu, China
| | - Zhu Liu
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, China
| | - Chenxing Zhu
- Department of Clinical Research Management, West China Hospital, Sichuan University, Chengdu, China
| | - Hui Wang
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, China
| | - Yusha Tang
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, China
| | - Anjiao Peng
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, China
| | - Lei Chen
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, China
- *Correspondence: Lei Chen
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9
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Mahammedi A, Wang LL, Vagal AS. Imaging Appearance of Migraine and Tension Type Headache. Neurol Clin 2022; 40:491-505. [PMID: 35871781 DOI: 10.1016/j.ncl.2022.02.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Abdelkader Mahammedi
- Department of Radiology, University of Cincinnati Medical Center, 234 Goodman Street, Cincinnati, OH 45219, USA.
| | - Lily L Wang
- Department of Radiology, University of Cincinnati Medical Center, 234 Goodman Street, Cincinnati, OH 45219, USA
| | - Achala S Vagal
- Department of Radiology, University of Cincinnati Medical Center, 234 Goodman Street, Cincinnati, OH 45219, USA
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10
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Coppola G, Corbelli I, Di Renzo A, Chiappiniello A, Chiarini P, Parisi V, Guercini G, Calabresi P, Tarducci R, Sarchielli P. Visual stimulation and frequency of focal neurological symptoms engage distinctive neurocognitive resources in migraine with aura patients: a study of resting-state functional networks. J Headache Pain 2022; 23:80. [PMID: 35820799 PMCID: PMC9277919 DOI: 10.1186/s10194-022-01446-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 06/23/2022] [Indexed: 11/10/2022] Open
Abstract
Introduction Several functional neuroimaging studies on healthy controls and patients with migraine with aura have shown that the activation of functional networks during visual stimulation is not restricted to the striate system, but also includes several extrastriate networks. Methods Before and after 4 min of visual stimulation with a checkerboard pattern, we collected functional MRI in 21 migraine with aura (MwA) patients and 18 healthy subjects (HS). For each recording session, we identified independent resting-state networks in each group and correlated network connection strength changes with clinical disease features. Results Before visual stimulation, we found reduced connectivity between the default mode network and the left dorsal attention system (DAS) in MwA patients compared to HS. In HS, visual stimulation increases functional connectivity between the independent components of the bilateral DAS and the executive control network (ECN). In MwA, visual stimulation significantly improved functional connectivity between the independent component pairs salience network and DAS, and between DAS and ECN. The ECN Z-scores after visual stimulation were negatively related to the monthly frequency of aura. Conclusions In individuals with MwA, 4 min of visual stimulation had stronger cognitive impact than in healthy people. A higher frequency of aura may lead to a diminished ability to obtain cognitive resources to cope with transitory but important events like aura-related focal neurological symptoms.
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Affiliation(s)
- Gianluca Coppola
- Department of Medico-Surgical Sciences and Biotechnologies, Sapienza University of Rome Polo Pontino - I.C.O.T., Via Franco Faggiana 1668, 04100, Latina, Italy.
| | - Ilenia Corbelli
- Section of Neurology, Department of Medicine and Surgery, University of Perugia, Perugia, Italy
| | | | | | - Pietro Chiarini
- Medical Physics Service, Azienda Ospedaliera Di Perugia, Perugia, Italy
| | | | - Giorgio Guercini
- Neuroradiology Service, Azienda Ospedaliera Di Perugia, Perugia, Italy
| | - Paolo Calabresi
- Department of Neuroscience, Cattolica Sacro Cuore University, Rome, Italy.,Neurologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Roberto Tarducci
- Medical Physics Service, Azienda Ospedaliera Di Perugia, Perugia, Italy
| | - Paola Sarchielli
- Section of Neurology, Department of Medicine and Surgery, University of Perugia, Perugia, Italy
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11
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Wang Y, Wang S, Qiu T, Xiao Z. Photophobia in headache disorders: characteristics and potential mechanisms. J Neurol 2022; 269:4055-4067. [PMID: 35322292 DOI: 10.1007/s00415-022-11080-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 03/10/2022] [Accepted: 03/10/2022] [Indexed: 01/23/2023]
Abstract
Photophobia is present in multiple types of headache disorders. The coexistence of photophobia and headache suggested the potential reciprocal interactions between visual and pain pathways. In this review, we summarized the photophobic characteristics in different types of headache disorders in the context of the three diagnostic categories of headache disorders: (1) primary headaches: migraine, tension-type headache, and trigeminal autonomic cephalalgias; (2) secondary headaches: headaches attributed to traumatic brain injury, meningitis, non-traumatic subarachnoid hemorrhage and disorder of the eyes; (3) painful cranial neuropathies: trigeminal neuralgia and painful optic neuritis. We then discussed potential mechanisms for the coexistence of photophobia and headache. In conclusion, the characteristics of photophobia are different among these headache disorders. The coexistence of photophobia and headache is associated with the interactions between visual and pain pathway at retina, midbrain, thalamus, hypothalamus and visual cortex. The communication between these pathways may depend on calcitonin gene-related peptide and pituitary cyclase-activating polypeptide transmission. Moreover, cortical spreading depression, an upstream trigger of headache, also plays an important role in photophobia by increased nociceptive input to the thalamus.
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Affiliation(s)
- Yajuan Wang
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei, China
| | - Shaoyang Wang
- Department of Emergency, Rizhao People's Hospital, Rizhao, 276800, Shandong, China
| | - Tao Qiu
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei, China
| | - Zheman Xiao
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan, 430060, Hubei, China.
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12
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Brandt RB, Cnossen VM, Doesborg PG, Coo IFD, Perenboom MJL, Carpay JA, Meilof R, Terwindt GM, Ferrari MD, Fronczek R. Unilateral increased visual sensitivity in cluster headache: a cross-sectional study. Cephalalgia 2022; 42:722-729. [PMID: 35301861 DOI: 10.1177/03331024221077664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND OBJECTIVES Increased sensitivity to light and patterns is typically associated with migraine, but has also been anecdotally reported in cluster headache, leading to diagnostic confusion. We wanted to assess whether visual sensitivity is increased ictally and interictally in cluster headache. METHODS We used the validated Leiden Visual Sensitivity Scale (L-VISS) questionnaire (range 0-36 points) to measure visual sensitivity in people with episodic or chronic cluster headache: (i) during attacks; (ii) in-between attacks; and in episodic cluster headache (iii) in-between bouts. The L-VISS scores were compared with the L-VISS scores obtained in a previous study in healthy controls and participants with migraine. RESULTS Mean L-VISS scores were higher for: (i) ictal vs interictal cluster headache (episodic cluster headache: 11.9 ± 8.0 vs. 5.2 ± 5.5, chronic cluster headache: 13.7 ± 8.4 vs 5.6 ± 4.8; p < 0.001); (ii) interictal cluster headache vs controls (5.3 ± 5.2 vs 3.6 ± 2.8, p < 0.001); (iii) interictal chronic cluster headache vs interictal ECH in bout (5.9 ± 0.5 vs 3.8 ± 0.5, p = 0.009), and (iv) interictal episodic cluster headache in bout vs episodic cluster headache out-of-bout (5.2 ± 5.5 vs. 3.7 ± 4.3, p < 0.001). Subjective visual hypersensitivity was reported by 110/121 (91%; 9 missing) participants with cluster headache and was mostly unilateral in 70/110 (64%) and ipsilateral to the ictal pain in 69/70 (99%) participants. CONCLUSION Cluster headache is associated with increased ictal and interictal visual sensitivity. In contrast to migraine, this is mostly unilateral and ipsilateral on the side of the ictal pain.
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Affiliation(s)
- Roemer B Brandt
- Department of Neurology, 4501Leiden University Medical Center, Leiden University Medical Center, Leiden, the Netherlands
| | - Victor M Cnossen
- Department of Neurology, 4501Leiden University Medical Center, Leiden University Medical Center, Leiden, the Netherlands
| | - Patty Gg Doesborg
- Department of Neurology, 4501Leiden University Medical Center, Leiden University Medical Center, Leiden, the Netherlands
| | - Ilse Frederieke de Coo
- Department of Neurology, 4501Leiden University Medical Center, Leiden University Medical Center, Leiden, the Netherlands
| | - Matthijs J L Perenboom
- Department of Neurology, 4501Leiden University Medical Center, Leiden University Medical Center, Leiden, the Netherlands
| | - Johannes A Carpay
- Department of Neurology, 4501Leiden University Medical Center, Leiden University Medical Center, Leiden, the Netherlands.,Department of Neurology, Tergooi Hospital, Hilversum, the Netherlands
| | - Roy Meilof
- Department of Neurology, 4501Leiden University Medical Center, Leiden University Medical Center, Leiden, the Netherlands
| | - Gisela Marie Terwindt
- Department of Neurology, 4501Leiden University Medical Center, Leiden University Medical Center, Leiden, the Netherlands
| | - Michel D Ferrari
- Department of Neurology, 4501Leiden University Medical Center, Leiden University Medical Center, Leiden, the Netherlands
| | - Rolf Fronczek
- Department of Neurology, 4501Leiden University Medical Center, Leiden University Medical Center, Leiden, the Netherlands
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13
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Bilen N, Hamurcu M. Evaluation of electrophysiological changes in migraine with visual aura. Taiwan J Ophthalmol 2022; 12:295-300. [PMID: 36248085 PMCID: PMC9558466 DOI: 10.4103/2211-5056.354281] [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: 04/03/2022] [Accepted: 07/02/2022] [Indexed: 11/30/2022] Open
Abstract
PURPOSE: The purpose of this study was to evaluate the electrical responses in the retina and cortex of migraine patients with electrophysiological tests and compare with healthy controls. MATERIALS AND METHODS: This prospective study included 18 migraine patients with visual aura and 28 healthy controls. Pattern-reversal visual evoked potentials (VEP) and flash electroretinography (fERG) of migraine patients during the headache-free period were compared with healthy controls. RESULTS: There were statistically significant differences in VEP results: P100 and N75 amplitudes increased significantly (P = 0.025 and P = 0.007 respectively) and P100 latency decreased significantly in migraine patients (P = 0.022). Furthermore, fERG scotopic combined cone and rod amplitude increased significantly in migraine patients (P = 0.01). CONCLUSION: Migraine brain displays abnormal visual evoked responses in between migraine attacks. In migraine eye, scotopic cone and rod response increased. The results of this study support the hyperexcitability of the retina and cortex in patients with migraine.
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14
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Gollion C. Cortical excitability in migraine: Contributions of magnetic resonance imaging. Rev Neurol (Paris) 2021; 177:809-815. [PMID: 34332777 DOI: 10.1016/j.neurol.2021.07.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Revised: 07/04/2021] [Accepted: 07/06/2021] [Indexed: 11/18/2022]
Abstract
Migraine is characterized by symptoms related to cortical hyperexcitability such as photophobia, phonophobia, osmophobia and allodynia. One-third of migraineurs experience aura, whose neurophysiological substrate is thought to be cortical spreading depression (CSD). Functional magnetic resonance imaging (MRI) has shown the migraine aura to be characterized by cerebral hyperactivity/hyperperfusion followed by hypometabolism/hypoperfusion spreading along the occipital cortex with the same spatiotemporal organization as the experimentally triggered CSD. The link between migraine aura and headache remains undetermined. Neuroimaging studies have failed to show a leakage of the blood-brain barrier, which was suspected to occur during CSD and to cause the stimulation of trigeminal nociceptive receptors. However, recent studies have highlighted the involvement of neuroglial inflammation and other studies have suggested that a common central network plays a role in the link between CSD and migraine pain. Finally, MRI has made it possible to study the contribution of metabolites such as glutamic acid, γ-amino-butyric acid and sodium in the pathophysiology of hyperexcitability in migraine.
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Affiliation(s)
- C Gollion
- Department of Neurology, University of Toulouse, Toulouse, France; ToNIC, Toulouse NeuroImaging Center, University of Toulouse, INSERM, Toulouse, France.
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15
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Bell T, Khaira A, Stokoe M, Webb M, Noel M, Amoozegar F, Harris AD. Age-related differences in resting state functional connectivity in pediatric migraine. J Headache Pain 2021; 22:65. [PMID: 34229614 PMCID: PMC8259418 DOI: 10.1186/s10194-021-01274-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 06/09/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Migraine affects roughly 10% of youth aged 5-15 years, however the underlying mechanisms of migraine in youth are poorly understood. Multiple structural and functional alterations have been shown in the brains of adult migraine sufferers. This study aims to investigate the effects of migraine on resting-state functional connectivity during the period of transition from childhood to adolescence, a critical period of brain development and the time when rates of pediatric chronic pain spikes. METHODS Using independent component analysis, we compared resting state network spatial maps and power spectra between youth with migraine aged 7-15 and age-matched controls. Statistical comparisons were conducted using a MANCOVA analysis. RESULTS We show (1) group by age interaction effects on connectivity in the visual and salience networks, group by sex interaction effects on connectivity in the default mode network and group by pubertal status interaction effects on connectivity in visual and frontal parietal networks, and (2) relationships between connectivity in the visual networks and the migraine cycle, and age by cycle interaction effects on connectivity in the visual, default mode and sensorimotor networks. CONCLUSIONS We demonstrate that brain alterations begin early in youth with migraine and are modulated by development. This highlights the need for further study into the neural mechanisms of migraine in youth specifically, to aid in the development of more effective treatments.
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Affiliation(s)
- Tiffany Bell
- Department of Radiology, University of Calgary, Calgary, AB, Canada. .,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada. .,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada.
| | - Akashroop Khaira
- Department of Radiology, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada
| | - Mehak Stokoe
- Department of Radiology, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada
| | - Megan Webb
- Department of Radiology, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada
| | - Melanie Noel
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada.,Department of Psychology, University of Calgary, Calgary, AB, Canada
| | - Farnaz Amoozegar
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.,Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Ashley D Harris
- Department of Radiology, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada
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16
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Abstract
Photophobia is one of the most common symptoms in migraine, and the underlying mechanism is uncertain. The discovery of the intrinsically-photosensitive retinal ganglion cells which signal the intensity of light on the retina has led to discussion of their role in the pathogenesis of photophobia. In the current review, we discuss the relationship between pain and discomfort leading to light aversion (traditional photophobia) and discomfort from flicker, patterns, and colour that are also common in migraine and cannot be explained solely by the activity of intrinsically-photosensitive retinal ganglion cells. We argue that, at least in migraine, a cortical mechanism provides a parsimonious explanation for discomfort from all forms of visual stimulation, and that the traditional definition of photophobia as pain in response to light may be too restrictive. Future investigation that directly compares the retinal and cortical contributions to photophobia in migraine with that in other conditions may offer better specificity in identifying biomarkers and possible mechanisms to target for treatment.
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Affiliation(s)
| | - Sarah M Haigh
- Department of Psychology and Integrative Neuroscience, University of Nevada, Reno, USA
| | - Omar A Mahroo
- Institute of Ophthalmology, University College London, London, UK and Retinal Service, Moorfields Eye Hospital, London, UK
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17
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Abstract
Migraine is a prevalent primary headache disorder and is usually considered as benign. However, structural and functional changes in the brain of individuals with migraine have been reported. High frequency of white matter abnormalities, silent infarct-like lesions, and volumetric changes in both gray and white matter in individuals with migraine compared to controls have been demonstrated. Functional magnetic resonance imaging (MRI) studies found altered connectivity in both the interictal and ictal phase of migraine. MR spectroscopy and positron emission tomography studies suggest abnormal energy metabolism and mitochondrial dysfunction, as well as other metabolic changes in individuals with migraine. In this review, we provide a brief overview of neuroimaging studies that have helped us to characterize some of these changes and discuss their limitations, including small sample sizes and poorly defined control groups. A better understanding of alterations in the brains of patients with migraine could help not only in the diagnosis but may potentially lead to the optimization of a targeted anti-migraine therapy.
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18
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Andreou AP, Leese C, Greco R, Demartini C, Corrie E, Simsek D, Zanaboni A, Koroleva K, Lloyd JO, Lambru G, Doran C, Gafurov O, Seward E, Giniatullin R, Tassorelli C, Davletov B. Double-Binding Botulinum Molecule with Reduced Muscle Paralysis: Evaluation in In Vitro and In Vivo Models of Migraine. Neurotherapeutics 2021; 18:556-568. [PMID: 33205382 PMCID: PMC8116399 DOI: 10.1007/s13311-020-00967-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/04/2020] [Indexed: 12/29/2022] Open
Abstract
With a prevalence of 15%, migraine is the most common neurological disorder and among the most disabling diseases, taking into account years lived with disability. Current oral medications for migraine show variable effects and are frequently associated with intolerable side effects, leading to the dissatisfaction of both patients and doctors. Injectable therapeutics, which include calcitonin gene-related peptide-targeting monoclonal antibodies and botulinum neurotoxin A (BoNT/A), provide a new paradigm for treatment of chronic migraine but are effective only in approximately 50% of subjects. Here, we investigated a novel engineered botulinum molecule with markedly reduced muscle paralyzing properties which could be beneficial for the treatment of migraine. This stapled botulinum molecule with duplicated binding domain-binary toxin-AA (BiTox/AA)-cleaves synaptosomal-associated protein 25 with a similar efficacy to BoNT/A in neurons; however, the paralyzing effect of BiTox/AA was 100 times less when compared to native BoNT/A following muscle injection. The performance of BiTox/AA was evaluated in cellular and animal models of migraine. BiTox/AA inhibited electrical nerve fiber activity in rat meningeal preparations while, in the trigeminovascular model, BiTox/AA raised electrical and mechanical stimulation thresholds in Aδ- and C-fiber nociceptors. In the rat glyceryl trinitrate (GTN) model, BiTox/AA proved effective in inhibiting GTN-induced hyperalgesia in the orofacial formalin test. We conclude that the engineered botulinum molecule provides a useful prototype for designing advanced future therapeutics for an improved efficacy in the treatment of migraine.
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Affiliation(s)
- Anna P Andreou
- Headache Research-Wolfson Centre for Age-Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- Headache Centre, Guy's and St Thomas's NHS Foundation Trust, King's Health Partners, London, UK
| | - Charlotte Leese
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK
| | - Rosaria Greco
- Translational Neurovascular Research Unit, IRCCS Mondino Foundation, Pavia, Italy
| | - Chiara Demartini
- Translational Neurovascular Research Unit, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | - Eve Corrie
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK
| | - Deniz Simsek
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK
| | - Anna Zanaboni
- Translational Neurovascular Research Unit, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | | | - Joseph O Lloyd
- Headache Research-Wolfson Centre for Age-Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Giorgio Lambru
- Headache Research-Wolfson Centre for Age-Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- Headache Centre, Guy's and St Thomas's NHS Foundation Trust, King's Health Partners, London, UK
| | - Ciara Doran
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK
| | - Oleg Gafurov
- Laboratory of Neurobiology, Kazan University, Kazan, Russia
| | - Elizabeth Seward
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK
| | - Rashid Giniatullin
- Laboratory of Neurobiology, Kazan University, Kazan, Russia
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Cristina Tassorelli
- Translational Neurovascular Research Unit, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | - Bazbek Davletov
- Department of Biomedical Science, University of Sheffield, Sheffield, S10 2TN, UK.
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19
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Antal A, Bischoff R, Stephani C, Czesnik D, Klinker F, Timäus C, Chaieb L, Paulus W. Low Intensity, Transcranial, Alternating Current Stimulation Reduces Migraine Attack Burden in a Home Application Set-Up: A Double-Blinded, Randomized Feasibility Study. Brain Sci 2020; 10:brainsci10110888. [PMID: 33233400 PMCID: PMC7700448 DOI: 10.3390/brainsci10110888] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/16/2020] [Accepted: 11/19/2020] [Indexed: 12/14/2022] Open
Abstract
Background: Low intensity, high-frequency transcranial alternating current stimulation (tACS) applied over the motor cortex decreases the amplitude of motor evoked potentials. This double-blind, placebo-controlled parallel group study aimed to test the efficacy of this method for acute management of migraines. Methods: The patients received either active (0.4 mA, 140 Hz) or sham stimulation for 15 min over the visual cortex with the number of terminated attacks two hours post-stimulation as the primary endpoint, as a home therapy option. They were advised to treat a maximum of five migraine attacks over the course of six weeks. Results: From forty patients, twenty-five completed the study, sixteen in the active and nine in the sham group with a total of 102 treated migraine attacks. The percentage of terminated migraine attacks not requiring acute rescue medication was significantly higher in the active (21.5%) than in the sham group (0%), and the perceived pain after active stimulation was significantly less for 2–4 h post-stimulation than after sham stimulation. Conclusion: tACS over the visual cortex has the potential to terminate migraine attacks. Nevertheless, the high drop-out rate due to compliance problems suggests that this method is impeded by its complexity and time-consuming setup.
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Affiliation(s)
- Andrea Antal
- Correspondence: ; Tel.: +49-551-398461; Fax: +49-551-398126
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20
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Cortez MM, Millsap L, Brennan KC. Synergistic but separable sensory changes in postural tachycardia syndrome and chronic migraine. Clin Auton Res 2020; 31:263-271. [PMID: 33174112 DOI: 10.1007/s10286-020-00740-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 10/23/2020] [Indexed: 11/29/2022]
Abstract
PURPOSE Up to 90% of patients with postural tachycardia syndrome (PoTS) report headaches, and comorbid migraine headaches are common. Given this, pathophysiological interaction is possible, which may reveal key aspects of disease expression and treatment opportunities. We hypothesized that PoTS subjects-both with and without migraine-would show features of central sensitization, including allodynia and photophobia. METHODS Eighty participants were evaluated, including 30 PoTS, 30 chronic migraine (CM), and 20 non-headache healthy controls (NH), using tilt table testing, psychophysical assessment of sensory sensitivity thresholds, and an online questionnaire to assess measures of headache burden and associated symptoms. Clinical characteristics and sensory thresholds were compared between disease groups and controls, as well as in a subgroup analysis within the PoTS group, based on headache phenotype. RESULTS Sensory sensitivity thresholds were significantly lower and symptom scores were higher in both the PoTS and CM groups compared to controls. However, the patterns of expression differed between PoTS and CM, with pain threshold reductions in the forearm only of PoTS subjects (non-trigeminal sensory sensitization), compared to both periorbital and forearm sites in CM. Unexpectedly, light sensitivity thresholds were significantly lower in PoTS than in both CM and NH. CONCLUSIONS These findings reveal an underappreciated aspect of disease burden in PoTS, and suggest network sensitization similar to, but separable from, that of migraine. The presence of both photophobia and allodynia in PoTS is reflective of exteroceptive rather than strictly interoceptive disruption, and expands our fundamental understanding of the disorder.
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Affiliation(s)
- Melissa M Cortez
- Department of Neurology, University of Utah, 729 Arapeen Drive, Salt Lake City, UT, 84108, USA.
| | - Leah Millsap
- School of Medicine, University of Utah, Salt Lake City, UT, USA
| | - K C Brennan
- Department of Neurology, University of Utah, 729 Arapeen Drive, Salt Lake City, UT, 84108, USA
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21
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Yin T, Sun G, Tian Z, Liu M, Gao Y, Dong M, Wu F, Li Z, Liang F, Zeng F, Lan L. The Spontaneous Activity Pattern of the Middle Occipital Gyrus Predicts the Clinical Efficacy of Acupuncture Treatment for Migraine Without Aura. Front Neurol 2020; 11:588207. [PMID: 33240209 PMCID: PMC7680874 DOI: 10.3389/fneur.2020.588207] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 09/30/2020] [Indexed: 12/11/2022] Open
Abstract
The purpose of the present study was to explore whether and to what extent the neuroimaging markers could predict the relief of the symptoms of patients with migraine without aura (MWoA) following a 4-week acupuncture treatment period. In study 1, the advanced multivariate pattern analysis was applied to perform a classification analysis between 40 patients with MWoA and 40 healthy subjects (HS) based on the z-transformed amplitude of low-frequency fluctuation (zALFF) maps. In study 2, the meaningful classifying features were selected as predicting features and the support vector regression models were constructed to predict the clinical efficacy of acupuncture in reducing the frequency of migraine attacks and headache intensity in 40 patients with MWoA. In study 3, a region of interest-based comparison between the pre- and post-treatment zALFF maps was conducted in 33 patients with MwoA to assess the changes in predicting features after acupuncture intervention. The zALFF value of the foci in the bilateral middle occipital gyrus, right fusiform gyrus, left insula, and left superior cerebellum could discriminate patients with MWoA from HS with higher than 70% accuracy. The zALFF value of the clusters in the right and left middle occipital gyrus could effectively predict the relief of headache intensity (R 2 = 0.38 ± 0.059, mean squared error = 2.626 ± 0.325) and frequency of migraine attacks (R 2 = 0.284 ± 0.072, mean squared error = 20.535 ± 2.701) after the 4-week acupuncture treatment period. Moreover, the zALFF values of these two clusters were both significantly reduced after treatment. The present study demonstrated the feasibility and validity of applying machine learning technologies and individual cerebral spontaneous activity patterns to predict acupuncture treatment outcomes in patients with MWoA. The data provided a quantitative benchmark for selecting acupuncture for MWoA.
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Affiliation(s)
- Tao Yin
- Acupuncture and Tuina School/The 3rd Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Guojuan Sun
- Department of Gynecology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Zilei Tian
- Acupuncture and Tuina School/The 3rd Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Mailan Liu
- College of Acupuncture and Moxibustion and Tui-na, Hunan University of Chinese Medicine, Changsha, China
| | - Yujie Gao
- Traditional Chinese Medicine School, Ningxia Medical University, Yinchuan, China
| | - Mingkai Dong
- Department of Acupuncture and Moxibustion, Xinjin Hospital of Traditional Chinese Medicine, Chengdu, China
| | - Feng Wu
- Department of Acupuncture and Moxibustion, Changsha Hospital of Traditional Chinese Medicine, Changsha, China
| | - Zhengjie Li
- Acupuncture and Tuina School/The 3rd Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Fanrong Liang
- Acupuncture and Tuina School/The 3rd Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Key Laboratory of Sichuan Province for Acupuncture and Chronobiology, Chengdu, China
| | - Fang Zeng
- Acupuncture and Tuina School/The 3rd Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Key Laboratory of Sichuan Province for Acupuncture and Chronobiology, Chengdu, China
| | - Lei Lan
- Acupuncture and Tuina School/The 3rd Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
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22
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Barbanti P, Brighina F, Egeo G, Di Stefano V, Silvestro M, Russo A. Migraine as a Cortical Brain Disorder. Headache 2020; 60:2103-2114. [PMID: 32851650 DOI: 10.1111/head.13935] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 07/30/2020] [Indexed: 01/01/2023]
Abstract
PURPOSE Migraine is an exclusively human chronic disorder with ictal manifestations characterized by a multifaceted clinical complexity pointing to a cerebral cortical involvement. The present review is aimed to cover the clinical, neuroimaging, and neurophysiological literature on the role of the cerebral cortex in migraine pathophysiology. OVERVIEW Converging clinical scenarios, advanced neuroimaging data, and experimental neurophysiological findings, indicate that fluctuating excitability, plasticity, and metabolism of cortical neurons represent the pathophysiological substrate of the migraine cycle. Abnormal cortical responsivity and sensory processing coupled to a mismatch between the brain's energy reserve and workload may ignite the trigeminovascular system, leading to the migraine attack through the activation of subcortical brain trigeminal and extra-trigeminal structures, and driving its propagation and maintenance. DISCUSSION The brain cortex emerges as the crucial player in migraine, a disorder lying at the intersection between neuroscience and daily life. Migraine disorder stems from an imbalance in inhibitory/excitatory cortical circuits, responsible for functional changes in the activity of different cortical brain regions encompassing the neurolimbic-pain network, and secondarily allowing a demodulation of subcortical areas, such as hypothalamus, amygdala, and brainstem nuclei, in a continuous mutual crosstalk.
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Affiliation(s)
- Piero Barbanti
- Headache and Pain Unit, IRCCS San Raffaele Pisana, Rome, Italy.,San Raffaele University, Rome, Italy
| | - Filippo Brighina
- Headache Center and Neurophysiology Unit, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Palermo, Italy
| | - Gabriella Egeo
- Headache and Pain Unit, IRCCS San Raffaele Pisana, Rome, Italy
| | - Vincenzo Di Stefano
- Headache Center and Neurophysiology Unit, Department of Biomedicine, Neuroscience and Advanced Diagnostics, University of Palermo, Palermo, Italy
| | - Marcello Silvestro
- Headache Center, Department of Advanced Medical and Surgical Sciences, University of Campania "Luigi Vanvitelli", Napoli, Italy
| | - Antonio Russo
- Headache Center, Department of Advanced Medical and Surgical Sciences, University of Campania "Luigi Vanvitelli", Napoli, Italy
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23
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Bulboacă AE, Stănescu IC, Bolboacă SD, Bulboacă AC, Bodizs GI, Nicula CA. Retinal Nerve Fiber Layer Thickness and Oxidative Stress Parameters in Migraine Patients without Aura: A Pilot Study. Antioxidants (Basel) 2020; 9:E494. [PMID: 32516927 PMCID: PMC7346136 DOI: 10.3390/antiox9060494] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 05/29/2020] [Accepted: 06/02/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Migraine is one of the most common disorders and its pathophysiological mechanisms are still under research, oxidative stress being emphasized as an important contributor. This study aimed to analyze the retinal nerve fiber layer (RNFL) thickness and oxidative/anti-oxidant balance in migraine patients. METHODS Two groups of subjects were evaluated: a group of patients with migraine and a control group of healthy volunteers. RNFL thickness was assessed for all subjects by the ocular coherence tomography spectral domain (OCT-SD). The oxidative stress parameter, namely nitric oxide (NOx), malondialdehyde (MDA), and total oxidative stress (TOS) were assessed. The antioxidant capacity of plasma was evaluated by assessing the level of catalase, and total anti-oxidative (TOS) capacity. Migraine severity was graded using the Migraine Disability Assessment Score (MIDAS) questionnaire. RESULTS All the oxidative stress parameters (NOx, MDA, and TOS) were significantly increased, and both parameters for anti-oxidative status were significantly decreased in the migraine group compared with the control group (p < 0.0001). Significant correlations with all the quadrants and different oxidative stress parameters were found, most involved being temporal quadrant. A significant positive correlation between catalase and macular RNFL thickness (inner ring, temporal quadrant) in migraine patients, for both eyes, was observed (p = 0.014 for the right eye and p = 0.12 for the left eye). CONCLUSION The assessment of the oxidative stress/anti-oxidative balance together with RFLN thickness can constitute a promising method to evaluate the progression of the diseases. It can also contribute to the estimation of the efficiency of various therapies targeting oxidative stress and associated inflammation.
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Affiliation(s)
- Adriana Elena Bulboacă
- Department of Pathophysiology, Iuliu Haţieganu University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania;
| | - Ioana C. Stănescu
- Department of Neurology and Pediatric Neurology, Iuliu Haţieganu University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania;
| | - Sorana D. Bolboacă
- Department of Medical Informatics and Biostatistics, Iuliu Haţieganu University of Medicine and Pharmacy, 400349 Cluj-Napoca, Romania
| | - Angelo C. Bulboacă
- Department of Neurology and Pediatric Neurology, Iuliu Haţieganu University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania;
| | | | - Cristina A. Nicula
- Department of Ophthalmology, Iuliu Haţieganu University of Medicine and Pharmacy, 400006 Cluj-Napoca, Romania;
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24
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Puledda F, Ffytche D, O'Daly O, Goadsby PJ. Imaging the Visual Network in the Migraine Spectrum. Front Neurol 2019; 10:1325. [PMID: 31920945 PMCID: PMC6923266 DOI: 10.3389/fneur.2019.01325] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 11/29/2019] [Indexed: 01/13/2023] Open
Abstract
The involvement of the visual network in migraine pathophysiology has been well-known for more than a century. Not only is the aura phenomenon linked to cortical alterations primarily localized in the visual cortex; but also migraine without aura has shown distinct dysfunction of visual processing in several studies in the past. Further, the study of photophobia, a hallmark migraine symptom, has allowed unraveling of distinct connections that link retinal pathways to the trigeminovascular system. Finally, visual snow, a recently recognized neurological disorder characterized by a continuous visual disturbance, is highly comorbid with migraine and possibly shares with it some common pathophysiological mechanisms. Here, we review the most relevant neuroimaging literature to date, considering studies that have either attempted to investigate the visual network or have indirectly shown visual processing dysfunctions in migraine. We do this by taking into account the broader spectrum of migrainous biology, thus analyzing migraine both with and without aura, focusing on light sensitivity as the most relevant visual symptom in migraine, and finally analyzing the visual snow syndrome. We also present possible hypotheses on the underlying pathophysiology of visual snow, for which very little is currently known.
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Affiliation(s)
- Francesca Puledda
- Headache Group, Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom
- NIHR-Wellcome Trust King's Clinical Research Facility, SLaM NIHR Biomedical Research Centre, King's College Hospital, London, United Kingdom
| | - Dominic Ffytche
- Department of Old Age Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom
| | - Owen O'Daly
- Department of Neuroimaging, Centre for Neuroimaging Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom
| | - Peter J. Goadsby
- Headache Group, Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom
- NIHR-Wellcome Trust King's Clinical Research Facility, SLaM NIHR Biomedical Research Centre, King's College Hospital, London, United Kingdom
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25
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Dysregulation of multisensory processing stands out from an early stage of migraine: a study in pediatric patients. J Neurol 2019; 267:760-769. [DOI: 10.1007/s00415-019-09639-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 11/13/2019] [Accepted: 11/14/2019] [Indexed: 12/18/2022]
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26
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Russo A, Silvestro M, Tessitore A, Tedeschi G. Shedding light on migraine with aura: the clarifying role of advanced neuroimaging investigations. Expert Rev Neurother 2019; 19:739-750. [PMID: 31267785 DOI: 10.1080/14737175.2019.1638252] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Introduction: While migraine with aura is a complex neurological syndrome with a well-characterized clinical phenotype, its pathophysiology still has grey areas which could be partially clarified by microstructural and functional neuroimaging investigations. Areas covered: This article, summarizing the most significant findings from advanced neuroimaging studies, aims to achieve a unifying pathophysiological model of the migraine aura. A comprehensive review has been conducted of PubMed citations by entering the key word 'neuroimaging' combined with 'migraine with aura' AND/OR 'MRI.' Other keywords included 'grey matter' OR 'white matter', 'structural' OR 'functional'. Expert opinion: Converging evidence from advanced neuroimaging investigations underlined the critical role of the extrastriate visual cortex, and in particular the lingual gyrus, in the genesis of the aura phenomenon. However, the relationship between the aura and the headache phase of migraine attacks has not been completely clarified, to date, and underlying pathophysiological mechanisms need to be further elucidated.
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Affiliation(s)
- Antonio Russo
- a Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences , University of Campania "Luigi Vanvitelli" , Naples , Italy.,b MRI Research Center SUN-FISM , University of Campania "Luigi Vanvitelli" , Naples , Italy
| | - Marcello Silvestro
- a Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences , University of Campania "Luigi Vanvitelli" , Naples , Italy.,b MRI Research Center SUN-FISM , University of Campania "Luigi Vanvitelli" , Naples , Italy
| | - Alessandro Tessitore
- a Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences , University of Campania "Luigi Vanvitelli" , Naples , Italy.,b MRI Research Center SUN-FISM , University of Campania "Luigi Vanvitelli" , Naples , Italy
| | - Gioacchino Tedeschi
- a Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences , University of Campania "Luigi Vanvitelli" , Naples , Italy.,c Institute for Diagnosis and Care ''Hermitage Capodimonte'' , Naples , Italy
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27
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The migraine eye: distinct rod-driven retinal pathways' response to dim light challenges the visual cortex hyperexcitability theory. Pain 2019; 160:569-578. [PMID: 30376534 DOI: 10.1097/j.pain.0000000000001434] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Migraine-type photophobia, most commonly described as exacerbation of headache by light, affects nearly 90% of the patients. It is the most bothersome symptom accompanying an attack. Using subjective psychophysical assessments, we showed that migraine patients are more sensitive to all colors of light during ictal than during interictal phase and that control subjects do not experience pain when exposed to different colors of light. Based on these findings, we suggested that color preference is unique to migraineurs (as it was not found in control subjects) rather than migraine phase (as it was found in both phases). To identify the origin of this photophobia in migraineurs, we compared the electrical waveforms that were generated in the retina and visual cortex of 46 interictal migraineurs to those generated in 42 healthy controls using color-based electroretinography and visual-evoked potential paradigms. Unexpectedly, it was the amplitude of the retinal rod-driven b wave, which was consistently larger (by 14%-19% in the light-adapted and 18%-34% in the dark-adapted flash ERG) in the migraineurs than in the controls, rather than the retinal cone-driven a wave or the visual-evoked potentials that differs most strikingly between the 2 groups. Mechanistically, these findings suggest that the inherent hypersensitivity to light among migraine patients may originate in the retinal rods rather than retinal cones or the visual cortex. Clinically, the findings may explain why migraineurs complain that the light is too bright even when it is dim to the extent that nonmigraineurs feel as if they are in a cave.
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28
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Fong CY, Takahashi C, Braithwaite JJ. Evidence for distinct clusters of diverse anomalous experiences and their selective association with signs of elevated cortical hyperexcitability. Conscious Cogn 2019; 71:1-17. [DOI: 10.1016/j.concog.2019.03.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 03/08/2019] [Accepted: 03/12/2019] [Indexed: 10/27/2022]
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Ellingson BM, Hesterman C, Johnston M, Dudeck NR, Charles AC, Villablanca JP. Advanced Imaging in the Evaluation of Migraine Headaches. Neuroimaging Clin N Am 2019; 29:301-324. [PMID: 30926119 PMCID: PMC8765285 DOI: 10.1016/j.nic.2019.01.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The use of advanced imaging in routine diagnostic practice appears to provide only limited value in patients with migraine who have not experienced recent changes in headache characteristics or symptoms. However, advanced imaging may have potential for studying the biological manifestations and pathophysiology of migraine headaches. Migraine with aura appears to have characteristic spatiotemporal changes in structural anatomy, function, hemodynamics, metabolism, and biochemistry, whereas migraine without aura produces more subtle and complex changes. Large, controlled, multicenter imaging-based observational trials are needed to confirm the anecdotal evidence in the literature and test the scientific hypotheses thought to underscore migraine pathophysiology.
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Affiliation(s)
- Benjamin M Ellingson
- UCLA Center for Computer Vision and Imaging Biomarkers, David Geffen School of Medicine, University of California Los Angeles, 924 Westwood Boulevard, Suite 615, Los Angeles, CA 90024, USA; Department of Radiological Sciences, David Geffen School of Medicine, University of California Los Angeles, 924 Westwood Boulevard, Suite 615, Los Angeles, CA 90024, USA; Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine, University of California Los Angeles, 760 Westwood Plaza, Los Angeles, CA 90095, USA; UCLA Brain Research Institute (BRI), David Geffen School of Medicine, University of California Los Angeles, 695 Charles E Young Dr S, Los Angeles, CA 90095, USA; UCLA Brain Tumor Imaging Laboratory (BTIL), Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, 924 Westwood Boulevard, Suite 615, Los Angeles, CA 90024, USA; UCLA Brain Tumor Imaging Laboratory (BTIL), Department of Psychiatry, David Geffen School of Medicine, University of California, Los Angeles, 924 Westwood Boulevard, Suite 615, Los Angeles, CA 90024, USA.
| | - Chelsea Hesterman
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, 710 Westwood Plaza, Los Angeles, CA 90095-1769, USA
| | - Mollie Johnston
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, 710 Westwood Plaza, Los Angeles, CA 90095-1769, USA
| | - Nicholas R Dudeck
- UCLA Center for Computer Vision and Imaging Biomarkers, David Geffen School of Medicine, University of California Los Angeles, 924 Westwood Boulevard, Suite 615, Los Angeles, CA 90024, USA; Department of Radiological Sciences, David Geffen School of Medicine, University of California Los Angeles, 924 Westwood Boulevard, Suite 615, Los Angeles, CA 90024, USA
| | - Andrew C Charles
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, 710 Westwood Plaza, Los Angeles, CA 90095-1769, USA
| | - Juan Pablo Villablanca
- Department of Radiological Sciences, David Geffen School of Medicine, University of California Los Angeles, 924 Westwood Boulevard, Suite 615, Los Angeles, CA 90024, USA
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Does the migraine attack start in the cortex and is the cortex critical in the migraine process? Neurol Sci 2019; 40:31-37. [DOI: 10.1007/s10072-019-03838-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Abstract
Aversion to light is common among migraineurs undergoing acute attacks. Using psychophysical assessments in patients with episodic migraine, we reported that white, blue, amber, and red lights exacerbate migraine headache in a significantly larger percentage of patients and to a greater extent compared with green light. This study aimed at determining whether these findings are phase-dependent-namely, manifested exclusively during migraine (ictally) but not in its absence (interictally), or condition-dependent-ie, expressed uniquely in migraineurs but not in healthy controls. To determine whether the color preference of migraine-type photophobia is phase- or condition-dependent, we compared the effects of each color of light in each intensity between migraineurs during and in-between attacks and healthy controls. During the ictal and interictal phases, the proportion of migraineurs reporting changes in headache severity when exposed to the different colors of light increased in accordance with elevated light intensities. During the ictal phase, white, blue, amber, and red lights exacerbated headaches in ∼80% of the patients; however, during the interictal phase, light initiated headache in only 16% to 19%. Notably, green light exacerbated headaches in 40% and triggered headaches in 3% of the patients studied during the ictal and interictal phases, respectively. With one exception (highest red light intensity), no control subject reported headache in response to the light stimuli. These findings suggest that color preference is unique to migraineurs-as it was not found in control subjects-and that it is independent of whether or not the patients are in their ictal or interictal phase.
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Russo A, Silvestro M, Tessitore A, Tedeschi G. Advances in migraine neuroimaging and clinical utility: from the MRI to the bedside. Expert Rev Neurother 2018; 18:533-544. [PMID: 29883214 DOI: 10.1080/14737175.2018.1486708] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
INTRODUCTION In current migraine clinical practice, no specific diagnostic investigations are available and therefore the diagnosis is an eminently clinical process where instrumental examinations may have a part to exclude possible causes of secondary headaches. While migraine clinical phenotype has been widely characterized, migraine pathophysiology has still a gap that might be partly bridged by structural and functional neuroimaging investigations. Areas covered: This article aims to review the recent advances in functional neuroimaging, the consequent progress in the knowledge of migraine pathophysiology and their putative application and impact in the clinical setting. A comprehensive review was conducted of PubMed citations by entering the key word 'MRI' combined with 'migraine' AND/OR 'headache.' Other key words included 'gray matter' OR 'white matter,' 'structural' OR 'functional.' The only restriction was English-language publication. The abstracts of all articles meeting these criteria were reviewed, and full texts were examined for relevant references. Expert commentary: Advanced magnetic resonance imaging (MRI) techniques are tremendously improving our knowledge about brain abnormalities in migraine patients. However, advanced MRI could nowadays overcome the limits linked to the clinicians' judgment through the identification of objectively measurable neuroimaging findings (quantitative biomarkers) concerning the diagnosis, the prognosis and 'tailored' therapeutic-care pathways.
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Affiliation(s)
- Antonio Russo
- a Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences , University of Campania "Luigi Vanvitelli" , Naples , Italy.,b MRI Research Center SUN-FISM , University of Campania "Luigi Vanvitelli" , Naples , Italy
| | - Marcello Silvestro
- a Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences , University of Campania "Luigi Vanvitelli" , Naples , Italy
| | - Alessandro Tessitore
- a Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences , University of Campania "Luigi Vanvitelli" , Naples , Italy.,b MRI Research Center SUN-FISM , University of Campania "Luigi Vanvitelli" , Naples , Italy
| | - Gioacchino Tedeschi
- a Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences , University of Campania "Luigi Vanvitelli" , Naples , Italy.,b MRI Research Center SUN-FISM , University of Campania "Luigi Vanvitelli" , Naples , Italy.,c Institute for Diagnosis and Care ''Hermitage Capodimonte'', Neurology Department , Naples , Italy
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Schulte LH, Allers A, May A. Visual stimulation leads to activation of the nociceptive trigeminal nucleus in chronic migraine. Neurology 2018; 90:e1973-e1978. [DOI: 10.1212/wnl.0000000000005622] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Accepted: 04/05/2018] [Indexed: 01/03/2023] Open
Abstract
ObjectiveThe visual system has often been described to be sensitized in migraineurs, with light being perceived as aversive or even painful. One possible explanation for this altered perception is crosslinks between the visual and the trigeminonociceptive system. Visual stimulation in chronic migraineurs on the level of the brainstem might lead to enhanced activity within the spinal trigeminal nucleus (sTN) as the main site of trigeminal pain processing within this area.MethodsEighteen episodic migraineurs (EM), 17 chronic migraineurs (CM), and 19 healthy controls (HC) underwent one session of high-resolution brainstem imaging during which a rotating checkerboard was presented repeatedly as a visual stimulus. Data were analyzed using SPM12 and MATLAB with the classic first-level–second-level approach of SPM. Analyses of variance were used for group comparisons.ResultsCM showed enhanced activation within the sTN as compared to HC. In addition, we observed enhanced activity within the right superior colliculus in CM as compared to HC. When comparing all migraineurs with headaches during scanning with all migraineurs without headaches during scanning and HC, we also found the sTN to be more strongly activated during headaches.ConclusionOur data provide evidence for the existence of visual–nociceptive integration on brainstem level in chronic migraineurs.
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34
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Russo A, Silvestro M, Tessitore A, Tedeschi G. Functional Neuroimaging Biomarkers in Migraine: Diagnostic, Prognostic and Therapeutic Implications. Curr Med Chem 2018; 26:6236-6252. [PMID: 29623825 DOI: 10.2174/0929867325666180406115427] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 03/20/2018] [Accepted: 03/22/2018] [Indexed: 01/03/2023]
Abstract
BACKGROUND In current migraine clinical practice, conventional neuroimaging examinations are often sought to exclude possible causes of secondary headaches or migraineassociated disorders. Contrariwise, although advanced Magnetic Resonance Imaging (MRI) has improved tremendously our understanding of human brain processes in migraine patients, to the state of the art they have not superseded the conventional neuroimaging techniques in the migraine clinical setting. METHODS A comprehensive review was conducted of PubMed citations by entering the keyword "marker" and/or "biomarker" combined with "migraine" and/or "headache". Other keywords included "imaging" or "neuroimaging", "structural" or "functional". The only restriction was English-language publication. The abstracts of all articles meeting these criteria were reviewed, and the full text was retrieved and examined for relevant references. RESULTS Several authors tried to identify imaging biomarkers able to identify different migraine phenotypes or, even better, to follow-up the same migraine patients during the course of the disease, to predict the evolution into more severe phenotypes and, finally, the response to specific treatment. CONCLUSION The identification of diagnostic, prognostic and therapeutic advanced neuroimaging biomarkers in the migraine clinical setting, in order to approach to patients in a more and more rational and "tailored" way, is extremely intriguing and futuristic. Unfortunately, reliable and robust neuroimaging biomarkers are still lacking for migraine, probably due to both not completely understood pathogenesis and clinical and neuroimaging heterogeneity. Although further longitudinal advanced neuroimaging studies, aimed to identify effective neuroimaging biomarkers, are needed, this review aims to collect the main and most recent works on this topic.
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Affiliation(s)
- Antonio Russo
- Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences, Second University of Campania "Luigi Vanvitelli", Naples, Italy.,MRI Research Center SUN-FISM, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Marcello Silvestro
- Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences, Second University of Campania "Luigi Vanvitelli", Naples, Italy.,MRI Research Center SUN-FISM, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Alessandro Tessitore
- Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences, Second University of Campania "Luigi Vanvitelli", Naples, Italy.,MRI Research Center SUN-FISM, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Gioacchino Tedeschi
- Headache Center, Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences, Second University of Campania "Luigi Vanvitelli", Naples, Italy.,MRI Research Center SUN-FISM, University of Campania "Luigi Vanvitelli", Naples, Italy.,Institute for Diagnosis and Care "Hermitage Capodimonte", Naples, Italy
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Abstract
PURPOSE OF REVIEW This review aims to provide an overview of the most recent and significant functional neuroimaging studies which have clarified the complex mechanisms underlying migraine pathophysiology. RECENT FINDINGS The recent data allow us to overcome the concept of a migraine generator suggesting that functional networks abnormalities may lead to changes in different brain area activities and consequent reduced migraine thresholds susceptibility, likely associated with higher migraine severity and burden. Although functional magnetic resonance imaging studies have allowed recognition of several migraine mechanisms, its pathophysiology is not completely understood and is still a matter of research. Nevertheless, in recent years, functional magnetic resonance imaging studies have allowed us to implement our knowledge of migraine pathophysiology. The pivotal role of both the brainstem and the hippocampus in the first phase of a migraine attack, the involvement of limbic pathway in the constitution of a migrainous pain network, the disrupted functional connectivity in cognitive brain networks, as well as the abnormal function of the visual network in patients with migraine with aura are the main milestones in migraine imaging achieved through functional imaging advances. We believe that further studies based on combined functional and structural techniques and the investigation of the different phases of migraine cycle may represent an efficient methodological approach for comprehensively looking into the migrainous brain secrets.
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Lozano-Soto E, Soto-León V, Sabbarese S, Ruiz-Alvarez L, Sanchez-del-Rio M, Aguilar J, Strange BA, Foffani G, Oliviero A. Transcranial static magnetic field stimulation (tSMS) of the visual cortex decreases experimental photophobia. Cephalalgia 2017; 38:1493-1497. [DOI: 10.1177/0333102417736899] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Background Transcranial static magnetic field stimulation (tSMS) reduces cortical excitability in humans. Methods The objective of this study was to determine whether tSMS over the occipital cortex is effective in reducing experimental photophobia. In a sham-controlled double-blind crossover study, tSMS (or sham) was applied for 10 minutes with a cylindrical magnet on the occiput of 20 healthy subjects. We assessed subjective discomfort induced by low-intensity and high-intensity visual stimuli presented in a dark room before, during and after tSMS (or sham). Results Compared to sham, tSMS significantly reduced the discomfort induced by high-intensity light stimuli. Conclusions The visual cortex may contribute to visual discomfort in experimental photophobia, providing a rationale for investigating tSMS as a possible treatment for photophobia in migraine.
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Affiliation(s)
- Elena Lozano-Soto
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Vanesa Soto-León
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Simona Sabbarese
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Lara Ruiz-Alvarez
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
- Neurology Service, Hospital del Henares. Coslada, Madrid, Spain
| | | | - Juan Aguilar
- Experimental Neurophysiology Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, CTB, Universidad Politecnica de Madrid, Madrid, Spain
- Department of Neuroimaging, Alzheimer’s Disease Research Centre, Reina Sofia-CIEN Foundation, Madrid, Spain
| | - Guglielmo Foffani
- HM CINAC, Hospital Universitario HM Puerta del Sur, Universidad CEU-San Pablo, Madrid, Spain
- Neural Bioengineering Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Antonio Oliviero
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
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Bekkelund SI, Müller KI, Wilhelmsen A, Alstadhaug KB. Photophobia and Seasonal Variation of Migraine in a Subarctic Population. Headache 2017. [DOI: 10.1111/head.13131] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Svein I. Bekkelund
- Department of Neurology; University Hospital of North Norway; Tromsø Norway
- Department of Clinical Medicine; UiT - The Arctic University of Norway; Tromsø Norway
| | - Kai I. Müller
- Department of Neurology; University Hospital of North Norway; Tromsø Norway
- Department of Clinical Medicine; UiT - The Arctic University of Norway; Tromsø Norway
| | - Aleksander Wilhelmsen
- Department of Clinical Medicine; UiT - The Arctic University of Norway; Tromsø Norway
| | - Karl B. Alstadhaug
- Department of Clinical Medicine; UiT - The Arctic University of Norway; Tromsø Norway
- Department of Neurology; Nordland Hospital Trust; Bodø Norway
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Ince F, Erdogan-Bakar E, Unal-Cevik I. Preventive drugs restore visual evoked habituation and attention in migraineurs. Acta Neurol Belg 2017; 117:523-530. [PMID: 28150096 DOI: 10.1007/s13760-017-0749-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 01/17/2017] [Indexed: 01/03/2023]
Abstract
Visual system pathway dysfunction has been postulated in migraineurs. We wanted to investigate if any difference exists interictally in visual attention and visual evoked habituation of frequently attacked migraineurs compared to the healthy control group. The effects of 3-month prophylactic migraine treatment on these parameters were also assessed. The migraineurs at headache-free interval (n = 52) and age, sex-matched healthy controls (n = 35) were compared by habituation response to 10 blocks of repetitive pattern-reversal visual stimuli (each block consisted 100 responses). The amplitude changes of 5th and 10th blocks were further compared with that of block 1 to assess the response of habituation (i.e., decrease) or potentiation (i.e., increase). The level of sustained visual attention was assessed by Cancellation test. Migraineurs were randomized to three different preventive treatments: propranolol 40 mg tid, flunarizine 5 mg bid, or topiramate 50 mg bid. After 3 months of preventive treatment, migraineurs data were compared with their baseline values. The groups did not differ by sex and age. In electrophysiological studies, the habituation ability observed in the healthy group was not observed in migraineurs. However, it was restored 3 months after preventive treatment. In migraineurs, compared to their baseline values, the distorted visual attention parameters also improved after treatment. All drugs were effective. The loss of habituation ability and low visual attention performance in migraineurs can be restored by migraine preventive treatment. This electrophysiological study accompanied by neuropsychological test may aid an objective and quantitative assessment tool for understanding migraine pathophysiology.
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Affiliation(s)
- Ferda Ince
- Department of Neurology, Ozel Ilke Yasam Medical Center, Dortyol, Turkey
| | - Emel Erdogan-Bakar
- Department of Psychology, Faculty of Science and Letter, Ufuk University, Ankara, Turkey
| | - Isin Unal-Cevik
- Department of Neurology, Faculty of Medicine, Pain Unit, Hacettepe University, Sıhhiye, 06100, Ankara, Turkey.
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Visual cortex and cerebellum hyperactivation during negative emotion picture stimuli in migraine patients. Sci Rep 2017; 7:41919. [PMID: 28181500 PMCID: PMC5299401 DOI: 10.1038/srep41919] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 01/03/2017] [Indexed: 01/03/2023] Open
Abstract
Migraines are a common and undertreated disease and often have psychiatric comorbidities; however, the abnormal mechanism of emotional processing in migraine patients has not been well clarified. This study sought to investigate the different brain functional activation to neutral, positive and negative emotional stimuli between migraine and healthy subjects. Twenty-six adults with migraines and 26 healthy adults, group-matched for sex and age, participated in this experiment. Although there were no significant differences between two groups during the viewing of positive affective pictures vs. neutral affective pictures, there were different activation patterns during the viewing of negative to neutral affective pictures in the two groups; the control group showed both increased and decreased activation patterns, while the migraine subjects showed only increased activation. Negative affective pictures elicited stronger activation than neutral affective pictures in migraineurs, which included the bilateral cerebellum anterior lobe/culmen, the bilateral lingual gyri, the bilateral precuneus and the left cuneus. Our data indicated that migraine patients were hypersensitive to negative stimuli, which might provide clues to aid in the understanding of the pathophysiology and psychiatric comorbidities of migraines.
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Coppola G, Di Renzo A, Tinelli E, Lepre C, Di Lorenzo C, Di Lorenzo G, Scapeccia M, Parisi V, Serrao M, Colonnese C, Schoenen J, Pierelli F. Thalamo-cortical network activity between migraine attacks: Insights from MRI-based microstructural and functional resting-state network correlation analysis. J Headache Pain 2016; 17:100. [PMID: 27778244 PMCID: PMC5078119 DOI: 10.1186/s10194-016-0693-y] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Accepted: 10/18/2016] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Resting state magnetic resonance imaging allows studying functionally interconnected brain networks. Here we were aimed to verify functional connectivity between brain networks at rest and its relationship with thalamic microstructure in migraine without aura (MO) patients between attacks. METHODS Eighteen patients with untreated MO underwent 3 T MRI scans and were compared to a group of 19 healthy volunteers (HV). We used MRI to collect resting state data among two selected resting state networks, identified using group independent component (IC) analysis. Fractional anisotropy (FA) and mean diffusivity (MD) values of bilateral thalami were retrieved from a previous diffusion tensor imaging study on the same subjects and correlated with resting state ICs Z-scores. RESULTS In comparison to HV, in MO we found significant reduced functional connectivity between the default mode network and the visuo-spatial system. Both HV and migraine patients selected ICs Z-scores correlated negatively with FA values of the thalamus bilaterally. CONCLUSIONS The present results are the first evidence supporting the hypothesis that an abnormal resting within networks connectivity associated with significant differences in baseline thalamic microstructure could contribute to interictal migraine pathophysiology.
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Affiliation(s)
- Gianluca Coppola
- Research Unit of Neurophysiology of Vision and Neurophthalmology, G.B. Bietti Foundation-IRCCS, Via Livenza 3, 00198, Rome, Italy.
| | - Antonio Di Renzo
- Research Unit of Neurophysiology of Vision and Neurophthalmology, G.B. Bietti Foundation-IRCCS, Via Livenza 3, 00198, Rome, Italy
| | - Emanuele Tinelli
- Department of Neurology and Psychiatry, Neuroradiology Section, "Sapienza" University of Rome, Rome, Italy
| | - Chiara Lepre
- Department of Medico-Surgical Sciences and Biotechnologies, Neurology Section, "Sapienza" University of Rome, Rome, Italy
| | | | - Giorgio Di Lorenzo
- Laboratory of Psychophysiology, Psychiatric Clinic, Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
| | - Marco Scapeccia
- Department of Neurology and Psychiatry, Neuroradiology Section, "Sapienza" University of Rome, Rome, Italy
| | - Vincenzo Parisi
- Research Unit of Neurophysiology of Vision and Neurophthalmology, G.B. Bietti Foundation-IRCCS, Via Livenza 3, 00198, Rome, Italy
| | - Mariano Serrao
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University of Rome Polo Pontino, Latina, Italy
| | - Claudio Colonnese
- Department of Neurology and Psychiatry, Neuroradiology Section, "Sapienza" University of Rome, Rome, Italy
- IRCCS Neuromed, Pozzilli, (IS), Italy
| | - Jean Schoenen
- Headache Research Unit, Department of Neurology-CHR Citadelle, University of Liège, Liège, Belgium
| | - Francesco Pierelli
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University of Rome Polo Pontino, Latina, Italy
- IRCCS Neuromed, Pozzilli, (IS), Italy
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Wilcox SL, Veggeberg R, Lemme J, Hodkinson DJ, Scrivani S, Burstein R, Becerra L, Borsook D. Increased Functional Activation of Limbic Brain Regions during Negative Emotional Processing in Migraine. Front Hum Neurosci 2016; 10:366. [PMID: 27507939 PMCID: PMC4960233 DOI: 10.3389/fnhum.2016.00366] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 07/08/2016] [Indexed: 01/07/2023] Open
Abstract
Pain is both an unpleasant sensory and emotional experience. This is highly relevant in migraine where cortical hyperexcitability in response to sensory stimuli (including pain, light, and sound) has been extensively reported. However, migraine may feature a more general enhanced response to aversive stimuli rather than being sensory-specific. To this end we used functional magnetic resonance imaging to assess neural activation in migraineurs interictaly in response to emotional visual stimuli from the International Affective Picture System. Migraineurs, compared to healthy controls, demonstrated increased neural activity in response to negative emotional stimuli. Most notably in regions overlapping in their involvement in both nociceptive and emotional processing including the posterior cingulate, caudate, amygdala, and thalamus (cluster corrected, p < 0.01). In contrast, migraineurs and healthy controls displayed no and minimal differences in response to positive and neutral emotional stimuli, respectively. These findings support the notion that migraine may feature more generalized altered cerebral processing of aversive/negative stimuli, rather than exclusively to sensory stimuli. A generalized hypersensitivity to aversive stimuli may be an inherent feature of migraine, or a consequential alteration developed over the duration of the disease. This proposed cortical-limbic hypersensitivity may form an important part of the migraine pathophysiology, including psychological comorbidity, and may represent an innate sensitivity to aversive stimuli that underpins attack triggers, attack persistence and (potentially) gradual headache chronification.
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Affiliation(s)
- Sophie L Wilcox
- Center for Pain and the Brain (PAIN Research Group), Boston Children's Hospital, Harvard Medical School, BostonMA, USA; Department of Anesthesiology, Perioperative and Pain Medicine, Boston Children's Hospital, Harvard Medical School, BostonMA, USA
| | - Rosanna Veggeberg
- Center for Pain and the Brain (PAIN Research Group), Boston Children's Hospital, Harvard Medical School, BostonMA, USA; Department of Psychiatry, PAIN Research Group, Brain Imaging Center, McLean Hospital, Harvard Medical School, BelmontMA, USA
| | - Jordan Lemme
- Department of Anesthesiology, Perioperative and Pain Medicine, Boston Children's Hospital, Harvard Medical School, Boston MA, USA
| | - Duncan J Hodkinson
- Center for Pain and the Brain (PAIN Research Group), Boston Children's Hospital, Harvard Medical School, BostonMA, USA; Department of Anesthesiology, Perioperative and Pain Medicine, Boston Children's Hospital, Harvard Medical School, BostonMA, USA
| | - Steven Scrivani
- Department of Oral and Maxillofacial Surgery, Massachusetts General Hospital, Boston MA, USA
| | - Rami Burstein
- Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston MA, USA
| | - Lino Becerra
- Center for Pain and the Brain (PAIN Research Group), Boston Children's Hospital, Harvard Medical School, BostonMA, USA; Department of Anesthesiology, Perioperative and Pain Medicine, Boston Children's Hospital, Harvard Medical School, BostonMA, USA; Department of Psychiatry, PAIN Research Group, Brain Imaging Center, McLean Hospital, Harvard Medical School, BelmontMA, USA
| | - David Borsook
- Center for Pain and the Brain (PAIN Research Group), Boston Children's Hospital, Harvard Medical School, BostonMA, USA; Department of Anesthesiology, Perioperative and Pain Medicine, Boston Children's Hospital, Harvard Medical School, BostonMA, USA; Department of Psychiatry, PAIN Research Group, Brain Imaging Center, McLean Hospital, Harvard Medical School, BelmontMA, USA
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Aydin N, Kotan D, Keles S, Ondas O, Aydin MD, Baykal O, Gundogdu B. An experimental study of the neurophysical mechanisms of photophobia induced by subarachnoid hemorrhage. Neurosci Lett 2016; 630:93-100. [PMID: 27436478 DOI: 10.1016/j.neulet.2016.07.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 04/28/2016] [Accepted: 07/11/2016] [Indexed: 11/29/2022]
Abstract
BACKGROUND Photophobia is defined as a painful psychosomatic discomfort triggered by intense light flow through the pupils to the brain, but the exact mechanism through which photophobia is induced by subarachnoid hemorrhage (SAH) is not well understood. In this study, we aimed to investigate whether there was any relationship between the mydriasis induced by the degeneration of the ciliary ganglion (CG) and photophobia in instances of SAH. MATERIALS AND METHODS Five of a total of 25 rabbits were used as the intact control group; five were used in the sham-operated control group; and the remaining 15 were used as the SAH group, which was created by injecting autologous blood into their cisterna magna. All animals were examined daily for 20days to evaluate their level of photophobia, after which their brains, CGs and superior cervical ganglia (SCGs) were extracted bilaterally. The densities of normal and degenerated neurons in these ganglia were examined by stereological methods. RESULTS In SAH animals with a high photophobia score, the mean pupil diameter and density of degenerated neurons density in the CG were greater than in cases with a low photophobia score (p<0.05). Further analysis revealed that the increase in the density of degenerated neurons in the CG following SAH resulted in the paralysis of the parasympathetic pathway of the pupillary muscles and mydriasis, which facilitates the excessive transfer of light to the brain and photophobia. CONCLUSION Our findings indicate that SAH results in a high density of degenerated neurons in the CG, which induces mydriasis and is an important factor in the onset of photophobia. This phenomenon is likely due to more light energy being transferred through mydriatic pupils to the brain, resulting in vasospasm of the supplying arteries.
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Affiliation(s)
- Nazan Aydin
- Department of Psychiatry, Bakirkoy Mazhar Osman Education Hospital, Istanbul, Turkey
| | - Dilcan Kotan
- Department of Neurology, Sakarya Universty School of Medicine, Sakarya, Turkey.
| | - Sadullah Keles
- Department of Ophthalmology, Ataturk Universty School of Medicine, Erzurum, Turkey
| | - Osman Ondas
- Opthalmology Clinic of Tokat-Erbaa Satate Hospital, Tokat, Turkey
| | - Mehmet Dumlu Aydin
- Department of Neurosurgery, Ataturk Universty School of Medicine, Erzurum, Turkey
| | - Orhan Baykal
- Department of Ophthalmology, Ataturk Universty School of Medicine, Erzurum, Turkey
| | - Betul Gundogdu
- Department of Pathology, Ataturk Universty School of Medicine, Erzurum, Turkey
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Abstract
PURPOSE OF REVIEW Over the last several years, a growing number of brain functional imaging studies have provided insights into mechanisms underlying migraine. This article reviews the recent migraine functional neuroimaging literature and provides recommendations for future studies that will help fill knowledge gaps. RECENT FINDINGS PET and functional MRI studies have identified brain regions that might be responsible for mediating the onset of a migraine attack and those associated with migraine symptoms. Enhanced activation of brain regions that facilitate processing of sensory stimuli suggests a mechanism by which migraineurs are hypersensitive to visual, olfactory, and cutaneous stimuli. Resting state functional connectivity MRI studies have identified numerous brain regions and functional networks with atypical functional connectivity in migraineurs, suggesting that migraine is associated with aberrant brain functional organization. SUMMARY Functional MRI and PET studies that have identified brain regions and brain networks that are atypical in migraine have helped to describe the neurofunctional basis for migraine symptoms. Future studies should compare functional imaging findings in migraine to other headache and pain disorders and should explore the utility of functional imaging data as biomarkers for diagnostic and treatment purposes.
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Astafiev SV, Zinn KL, Shulman GL, Corbetta M. Exploring the physiological correlates of chronic mild traumatic brain injury symptoms. NEUROIMAGE-CLINICAL 2016; 11:10-19. [PMID: 26909324 PMCID: PMC4732189 DOI: 10.1016/j.nicl.2016.01.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Revised: 12/31/2015] [Accepted: 01/04/2016] [Indexed: 12/14/2022]
Abstract
We report on the results of a multimodal imaging study involving behavioral assessments, evoked and resting-state BOLD fMRI, and DTI in chronic mTBI subjects. We found that larger task-evoked BOLD activity in the MT+/LO region in extra-striate visual cortex correlated with mTBI and PTSD symptoms, especially light sensitivity. Moreover, higher FA values near the left optic radiation (OR) were associated with both light sensitivity and higher BOLD activity in the MT+/LO region. The MT+/LO region was localized as a region of abnormal functional connectivity with central white matter regions previously found to have abnormal physiological signals during visual eye movement tracking (Astafiev et al., 2015). We conclude that mTBI symptoms and light sensitivity may be related to excessive responsiveness of visual cortex to sensory stimuli. This abnormal sensitivity may be related to chronic remodeling of white matter visual pathways acutely injured. We report a multimodal imaging study of symptoms in chronic mTBI. Higher BOLD activity in the MT +/LO region correlated with mTBI symptoms. Higher FA near the left optic radiation was associated with light sensitivity.
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Affiliation(s)
- Serguei V Astafiev
- Department of Neurology, Washington University in St. Louis, 660 S. Euclid Ave, Campus Box 8225, St. Louis, MO 63110, USA.
| | - Kristina L Zinn
- Department of Neurology, Washington University in St. Louis, 660 S. Euclid Ave, Campus Box 8225, St. Louis, MO 63110, USA.
| | - Gordon L Shulman
- Department of Neurology, Washington University in St. Louis, 660 S. Euclid Ave, Campus Box 8225, St. Louis, MO 63110, USA.
| | - Maurizio Corbetta
- Department of Neurology, Washington University in St. Louis, 660 S. Euclid Ave, Campus Box 8225, St. Louis, MO 63110, USA.
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Chong CD, Starling AJ, Schwedt TJ. Interictal photosensitivity associates with altered brain structure in patients with episodic migraine. Cephalalgia 2015; 36:526-33. [DOI: 10.1177/0333102415606080] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 07/26/2015] [Indexed: 11/16/2022]
Abstract
Background Migraine attacks manifest with hypersensitivities to light, sound, touch and odor. Some people with migraine have photosensitivity between migraine attacks, suggesting persistent alterations in the integrity of brain regions that process light. Although functional neuroimaging studies have shown visual stimulus induced “hyperactivation” of visual cortex regions in migraineurs between attacks, whether photosensitivity is associated with alterations in brain structure is unknown. Methods Levels of photosensitivity were evaluated using the Photosensitivity Assessment Questionnaire in 48 interictal migraineurs and 48 healthy controls. Vertex-by-vertex measurements of cortical thickness were assessed in 28 people with episodic migraine who had interictal photosensitivity (mean age = 35.0 years, SD = 12.1) and 20 episodic migraine patients without symptoms of interictal photosensitivity (mean age = 36.0 years, SD = 11.4) using a general linear model design. Results Migraineurs have greater levels of interictal photosensitivity relative to healthy controls. Relative to migraineurs without interictal photosensitivity, migraineurs with interictal photosensitivity have thicker cortex in several brain areas including the right lingual, isthmus cingulate and pericalcarine regions, and the left precentral, postcentral and supramarginal regions. Conclusion Episodic migraineurs with interictal photosensitivity have greater cortical thickness in the right parietal-occipital and left fronto-parietal regions, suggesting that persistent light sensitivity is associated with underlying structural alterations.
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Demarquay G, Mauguière F. Central Nervous System Underpinnings of Sensory Hypersensitivity in Migraine: Insights from Neuroimaging and Electrophysiological Studies. Headache 2015; 56:1418-1438. [PMID: 26350583 DOI: 10.1111/head.12651] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/06/2015] [Indexed: 01/03/2023]
Abstract
Whereas considerable data have been generated about the pathophysiology of pain processing during migraine attacks, relatively little is known about the neural basis of sensory hypersensitivity. In migraine, the term "hypersensitivity" encompasses different and probably distinct pathophysiological aspects of sensory sensitivity. During attacks, many patients have enhanced sensitivity to visual, auditory and/or olfactory stimuli, which can enhance headache while interictally, migraineurs often report abnormal sensitivity to environmental stimuli that can cause nonpainful discomfort. In addition, sensorial stimuli can influence and trigger the onset of migraine attacks. The pathophysiological mechanisms and the origin of such sensitivity (individual predisposition to develop migraine disease or consequence of repeated migraine attacks) are ill understood. Functional neuroimaging and electrophysiological studies allow for noninvasive measures of neuronal responses to external stimuli and have contributed to our understanding of mechanisms underlying sensory hypersensitivity in migraine. The purpose of this review is to present pivotal neuroimaging and neurophysiological studies that explored the basal state of brain responsiveness to sensory stimuli in migraineurs, the alterations in habituation and attention to sensory inputs, the fluctuations of responsiveness to sensory stimuli before and during migraine attacks, and the relations between sensory hypersensitivity and clinical sensory complaints.
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Affiliation(s)
- Geneviève Demarquay
- Department of Neurology, Croix-Rousse Hospital, Hospices Civils de Lyon, Lyon, France and Lyon Neuroscience Research Center (CRNL), Brain Dynamics and Cognition Team (Dycog), INSERM U1028, CNRS UMR5292, Lyon, France.
| | - François Mauguière
- Neurological Hospital Pierre Wertheimer: Functional Neurology and Epilepsy Department, Hospices Civils de Lyon and Claude Bernard Lyon1 University, Lyon, France, and Lyon Neuroscience Research Center (CRNL), Neuropain team, INSERM U1028, CNRS UMR5292, Lyon, France
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Unal-Cevik I, Yildiz FG. Visual Snow in Migraine With Aura: Further Characterization by Brain Imaging, Electrophysiology, and Treatment--Case Report. Headache 2015; 55:1436-41. [PMID: 26307008 DOI: 10.1111/head.12628] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/01/2015] [Indexed: 01/03/2023]
Abstract
OBJECTIVE This study aims to investigate characteristics of visual snow accompanied by migraine and special interest on occipital bending, electrophysiological properties, and response to treatment. BACKGROUND Visual snow is characterized by continuous dynamically flickering dots in the visual field. Most patients also have comorbid migraine. Cortical hyperexcitability is a feature of migraine. Recent studies indicate an association between occipital bending with psychiatric disorders such as depression. Here, we demonstrate a patient with visual snow, migraine with aura, left occipital bending, and cortical hyperexcitability. Treatment response to lamotrigine was objectively assessed by repetitive pattern reversal visual evoked potentials (rVEP). METHODS A 25-year-old woman with a 10-year history of migraine with aura (2-3 attacks/week) admitted for 1-year history of visual snow. She reported continuous bright and colorful lights, palinopsia, floaters, nyctalopsia, and photopsia. Brain magnetic resonance imaging (MRI) was performed. Visual habituation response was assessed before and after lamotrigine treatment by rVEP. RESULTS Brain MRI revealed left occipital bending. On rVEP study, there was potentiation response. After lamotrigine treatment, the patient had no more complaints of visual snow, was able to sleep, and the frequency of migraine decreased to 2 attacks/month. Electrophysiologically, the cortical hyperexcitability was improved. CONCLUSIONS The visual snow and loss of habituation ability in migraine associated with occipital bending can be improved with lamotrigine treatment. This report may provide new insights on "visual snow" pathophysiology in migraine.
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Affiliation(s)
- Isin Unal-Cevik
- Hacettepe University, Faculty of Medicine, Department of Neurology, Pain Unit, Ankara, Turkey
| | - F Gokcem Yildiz
- Hacettepe University, Institute of Neurological Sciences and Psychiatry, Ankara, Turkey
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48
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Prophylactic treatment in menstrual migraine: A proof-of-concept study. J Neurol Sci 2015; 354:103-9. [DOI: 10.1016/j.jns.2015.05.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 05/04/2015] [Accepted: 05/06/2015] [Indexed: 11/20/2022]
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Abstract
BACKGROUND Photophobia is a debilitating feature of many headache disorders. OVERVIEW Clinical and preclinical research has identified several potential pathways involved in enhanced light sensitivity. Some of these structures include trigeminal afferents in the eye, second-order neurons in the trigeminal nucleus caudalis, third-order neurons in the posterior thalamus, modulatory neurons in the hypothalamus, and fourth-order neurons in the visual and somatosensory cortices. It is unclear to what degree each site plays a role in establishing the different temporal patterns of photophobia across different disorders. Peptides such as calcitonin gene-related peptide and pituitary adenylate cyclase-activating polypeptide may play a role in photophobia at multiple levels of the visual and trigeminal pathways. CONCLUSION While our understanding of photophobia has greatly improved in the last decade, there are still unanswered questions. These answers will help us develop new therapies to provide relief to patients with primary headache disorders.
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Affiliation(s)
- Heather L Rossi
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania & Children's Hospital of Pennsylvania, Philadelphia, PA, USA
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Abstract
Migraine is a disabling neurological condition manifesting with attacks of headache, hypersensitivities to visual, auditory, olfactory and somatosensory stimuli, nausea, and vomiting. Exposure to sensory stimuli, such as odours, visual stimuli, and sounds, commonly triggers migraine attacks, and hypersensitivities to sensory stimuli are prominent during migraine attacks, but can persist with less magnitude between attacks. Functional MRI (fMRI) has been used to investigate the mechanisms that lead to migraine sensory hypersensitivities by measuring brain responses to visual, olfactory, and painful cutaneous stimulation, and functional connectivity analyses have investigated the functional organisation of specific brain regions and networks responsible for sensory processing. These studies have consistently shown atypical brain responses to sensory stimuli, absence of the normal habituating response between attacks, and atypical functional connectivity of sensory processing regions. Identification of the mechanisms that lead to migraine sensory hypersensitivities and that trigger migraine attacks in response to sensory stimuli might help to better understand neural dysfunction in migraine and provide new targets for migraine prevention, and could provide fMRI biomarkers that indicate early responses to preventive therapy.
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