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Powell K, Lin K, Tambo W, Saavedra AP, Sciubba D, Al Abed Y, Li C. Trigeminal nerve stimulation: a current state-of-the-art review. Bioelectron Med 2023; 9:30. [PMID: 38087375 PMCID: PMC10717521 DOI: 10.1186/s42234-023-00128-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 10/04/2023] [Indexed: 09/26/2024] Open
Abstract
Nearly 5 decades ago, the effect of trigeminal nerve stimulation (TNS) on cerebral blood flow was observed for the first time. This implication directly led to further investigations and TNS' success as a therapeutic intervention. Possessing unique connections with key brain and brainstem regions, TNS has been observed to modulate cerebral vasodilation, brain metabolism, cerebral autoregulation, cerebral and systemic inflammation, and the autonomic nervous system. The unique range of effects make it a prime therapeutic modality and have led to its clinical usage in chronic conditions such as migraine, prolonged disorders of consciousness, and depression. This review aims to present a comprehensive overview of TNS research and its broader therapeutic potentialities. For the purpose of this review, PubMed and Google Scholar were searched from inception to August 28, 2023 to identify a total of 89 relevant studies, both clinical and pre-clinical. TNS harnesses the release of vasoactive neuropeptides, modulation of neurotransmission, and direct action upon the autonomic nervous system to generate a suite of powerful multitarget therapeutic effects. While TNS has been applied clinically to chronic pathological conditions, these powerful effects have recently shown great potential in a number of acute/traumatic pathologies. However, there are still key mechanistic and methodologic knowledge gaps to be solved to make TNS a viable therapeutic option in wider clinical settings. These include bimodal or paradoxical effects and mechanisms, questions regarding its safety in acute/traumatic conditions, the development of more selective stimulation methods to avoid potential maladaptive effects, and its connection to the diving reflex, a trigeminally-mediated protective endogenous reflex. The address of these questions could overcome the current limitations and allow TNS to be applied therapeutically to an innumerable number of pathologies, such that it now stands at the precipice of becoming a ground-breaking therapeutic modality.
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Affiliation(s)
- Keren Powell
- Translational Brain Research Laboratory, The Feinstein Institutes for Medical Research, 350 Community Dr, Manhasset, NY, 11030, USA
- Institute for Bioelectronic Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, USA
| | - Kanheng Lin
- Translational Brain Research Laboratory, The Feinstein Institutes for Medical Research, 350 Community Dr, Manhasset, NY, 11030, USA
- Institute for Bioelectronic Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, USA
- Emory University, Atlanta, GA, USA
| | - Willians Tambo
- Translational Brain Research Laboratory, The Feinstein Institutes for Medical Research, 350 Community Dr, Manhasset, NY, 11030, USA
- Institute for Bioelectronic Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, USA
- Elmezzi Graduate School of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, USA
| | | | - Daniel Sciubba
- Department of Neurosurgery, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA
| | - Yousef Al Abed
- Institute for Bioelectronic Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, USA
| | - Chunyan Li
- Translational Brain Research Laboratory, The Feinstein Institutes for Medical Research, 350 Community Dr, Manhasset, NY, 11030, USA.
- Institute for Bioelectronic Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, USA.
- Elmezzi Graduate School of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, USA.
- Department of Neurosurgery, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA.
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2
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Terrier LM, Bergemer AM, Destrieux C, Maldonado IL. Anatomical study of the carotid-trigeminal interface: The missing link in the trigeminovascular system? J Anat 2022; 241:1303-1309. [PMID: 36156796 DOI: 10.1111/joa.13765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 08/27/2022] [Accepted: 08/29/2022] [Indexed: 11/30/2022] Open
Abstract
The trigeminal system is considered a prominent actor in brain nociceptive innervation. The trigeminovascular system is mainly composed of pseudounipolar neurons located within the trigeminal ganglion, whose dendrites originate in cerebral blood vessels. Anatomical studies demonstrating anatomical continuity between perivascular fibers and the trigeminal system are lacking. This issue is addressed in this study. Eleven cadaveric heads obtained from a body donation program were fixed in formalin. We performed a microanatomical study of the cavernous carotid-trigeminal interface and a histological examination of the tissue bridges crossing the virtual space between the medial aspect of the trigeminal ganglion and ophthalmic nerve and the lateral aspect of the cavernous segment of the internal carotid artery. Very strong adhesion was observed between the horizontal segment of the artery and the ophthalmic nerve in all specimens. The virtual space in this interface was crossed by a web of delicate filaments. Histological examination demonstrated the presence of nerve fibers in all samples. In this study, the carotid-trigeminal interface has been described in greater detail than ever before and could provide insight into disorders related to the trigeminovascular system. As the present results do not allow the exact nature of the axons to be affirmed, further investigation is necessary.
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Affiliation(s)
- Louis-Marie Terrier
- Department of Neurosurgery, Clairval Private Hospital, Ramsay Generale de Santé, Marseille, France.,UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | | | - Christophe Destrieux
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,Service de Neurochirurgie, CHRU de Tours, Tours, France
| | - Igor Lima Maldonado
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,Service de Neurochirurgie, CHRU de Tours, Tours, France
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3
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The trigeminal pathways. J Neurol 2022; 269:3443-3460. [DOI: 10.1007/s00415-022-11002-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 01/29/2022] [Accepted: 01/29/2022] [Indexed: 12/14/2022]
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4
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Choi JL, Alaraj A. Commentary: Percutaneous Trigeminal Nerve Stimulation Induces Cerebral Vasodilation in a Dose-Dependent Manner. Neurosurgery 2021; 89:E126-E127. [PMID: 34022046 DOI: 10.1093/neuros/nyab168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 03/15/2021] [Indexed: 11/12/2022] Open
Affiliation(s)
- Jason Lee Choi
- Department of Neurosurgery, College of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Ali Alaraj
- Department of Neurosurgery, College of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA
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5
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White TG, Powell K, Shah KA, Woo HH, Narayan RK, Li C. Trigeminal Nerve Control of Cerebral Blood Flow: A Brief Review. Front Neurosci 2021; 15:649910. [PMID: 33927590 PMCID: PMC8076561 DOI: 10.3389/fnins.2021.649910] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 03/22/2021] [Indexed: 01/13/2023] Open
Abstract
The trigeminal nerve, the fifth cranial nerve, is known to innervate much of the cerebral arterial vasculature and significantly contributes to the control of cerebrovascular tone in both healthy and diseased states. Previous studies have demonstrated that stimulation of the trigeminal nerve (TNS) increases cerebral blood flow (CBF) via antidromic, trigemino-parasympathetic, and other central pathways. Despite some previous reports on the role of the trigeminal nerve and its control of CBF, there are only a few studies that investigate the effects of TNS on disorders of cerebral perfusion (i.e., ischemic stroke, subarachnoid hemorrhage, and traumatic brain injury). In this mini review, we present the current knowledge regarding the mechanisms of trigeminal nerve control of CBF, the anatomic underpinnings for targeted treatment, and potential clinical applications of TNS, with a focus on the treatment of impaired cerebral perfusion.
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Affiliation(s)
- Timothy G White
- Translational Brain Research Laboratory, The Feinstein Institutes for Medical Research, Manhasset, NY, United States.,Department of Neurosurgery, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
| | - Keren Powell
- Translational Brain Research Laboratory, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
| | - Kevin A Shah
- Department of Neurosurgery, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
| | - Henry H Woo
- Department of Neurosurgery, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
| | - Raj K Narayan
- Translational Brain Research Laboratory, The Feinstein Institutes for Medical Research, Manhasset, NY, United States.,Department of Neurosurgery, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
| | - Chunyan Li
- Translational Brain Research Laboratory, The Feinstein Institutes for Medical Research, Manhasset, NY, United States.,Department of Neurosurgery, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
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6
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Terrier LM, Hadjikhani N, Velut S, Magnain C, Amelot A, Bernard F, Zöllei L, Destrieux C. The trigeminal system: The meningovascular complex- A review. J Anat 2021; 239:1-11. [PMID: 33604906 DOI: 10.1111/joa.13413] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 02/02/2021] [Accepted: 02/03/2021] [Indexed: 12/12/2022] Open
Abstract
Supratentorial sensory perception, including pain, is subserved by the trigeminal nerve, in particular, by the branches of its ophthalmic division, which provide an extensive innervation of the dura mater and of the major brain blood vessels. In addition, contrary to previous assumptions, studies on awake patients during surgery have demonstrated that the mechanical stimulation of the pia mater and small cerebral vessels can also produce pain. The trigeminovascular system, located at the interface between the nervous and vascular systems, is therefore perfectly positioned to detect sensory inputs and influence blood flow regulation. Despite the fact that it remains only partially understood, the trigeminovascular system is most probably involved in several pathologies, including very frequent ones such as migraine, or other severe conditions, such as subarachnoid haemorrhage. The incomplete knowledge about the exact roles of the trigeminal system in headache, blood flow regulation, blood barrier permeability and trigemino-cardiac reflex warrants for an increased investigation of the anatomy and physiology of the trigeminal system. This translational review aims at presenting comprehensive information about the dural and brain afferents of the trigeminovascular system, in order to improve the understanding of trigeminal cranial sensory perception and to spark a new field of exploration for headache and other brain diseases.
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Affiliation(s)
- Louis-Marie Terrier
- UMR 1253, ibrain, Université de Tours, Inserm, Tours, France.,CHRU de Tours, Tours, France
| | - Nouchine Hadjikhani
- Martinos Center for Biomedical Imaging, Harvard Medical School/MGH/MIT, Boston, MA, USA
| | - Stéphane Velut
- UMR 1253, ibrain, Université de Tours, Inserm, Tours, France.,CHRU de Tours, Tours, France
| | - Caroline Magnain
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, USA
| | - Aymeric Amelot
- UMR 1253, ibrain, Université de Tours, Inserm, Tours, France.,CHRU de Tours, Tours, France
| | | | - Lilla Zöllei
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, USA
| | - Christophe Destrieux
- UMR 1253, ibrain, Université de Tours, Inserm, Tours, France.,CHRU de Tours, Tours, France
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7
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Goadsby PJ, Sahai-Srivastava S, Kezirian EJ, Calhoun AH, Matthews DC, McAllister PJ, Costantino PD, Friedman DI, Zuniga JR, Mechtler LL, Popat SR, Rezai AR, Dodick DW. Safety and efficacy of sphenopalatine ganglion stimulation for chronic cluster headache: a double-blind, randomised controlled trial. Lancet Neurol 2019; 18:1081-1090. [DOI: 10.1016/s1474-4422(19)30322-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 07/29/2019] [Accepted: 07/29/2019] [Indexed: 11/17/2022]
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8
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Dingle A, Zeng W, Ness JP, Albano N, Minor RL, Feldman C, Austin M, Brodnick SK, Shulzhenko N, Sanchez R, Lake WB, Williams JC, Poore SO, Suminski AJ. Strategies for interfacing with the trigeminal nerves in rodents for bioelectric medicine. J Neurosci Methods 2019; 324:108321. [PMID: 31229585 DOI: 10.1016/j.jneumeth.2019.108321] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 06/05/2019] [Accepted: 06/19/2019] [Indexed: 01/19/2023]
Abstract
BACKGROUND Bioelectric medicine seeks to modulate neural activity via targeted electrical stimulation to treat disease. Recent clinical evidence supports trigeminal nerve stimulation as a bioelectric treatment for several neurological disorders; however, the mechanisms of trigeminal nerve stimulation and potential side effects remain largely unknown. The goal of this study is to optimize the methodology and reproducibility of neural interface implantation for mechanistic studies in rodents. NEW METHOD(S) This article describes a single incision surgical approach to the infraorbital nerve of rats and mice and the supraorbital nerve in rats for trigeminal nerve stimulation studies. This article also presents the use of cortical evoked potentials and electromyography as methods for demonstrating effective engagement between the implanted electrode and target nerve. COMPARISON WITH EXISTING METHOD(S) A number of surgical approaches to the infraorbital nerve in rats exist, many of which are technically difficult. A simple, standardized approach to infraorbital nerve in rats and mice, as well as the supraorbital nerve of rats is integral to reproducibility of future trigeminal nerve stimulation studies. CONCLUSION The infraorbital nerve of rats and mice can be easily accessed from a single dorsal incision on the bridge of the nose that avoids major anatomical structures such as the facial nerve. The supraorbital nerve is also accessible in rats from a single dorsal incision, but not mice due to size. Successful interfacing and engagement of the infra- and supraorbital nerves using the described methodology is demonstrated by recording of evoked cortical potentials and electromyography.
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Affiliation(s)
- Aaron Dingle
- Division of Plastic Surgery, Department of Surgery, University of Wisconsin-Madison, United States.
| | - Weifeng Zeng
- Division of Plastic Surgery, Department of Surgery, University of Wisconsin-Madison, United States
| | - Jared P Ness
- Department of Biomedical Engineering, University of Wisconsin-Madison, United States
| | - Nicholas Albano
- Division of Plastic Surgery, Department of Surgery, University of Wisconsin-Madison, United States
| | - Rashea L Minor
- School of Veterinary Medicine, University of Wisconsin-Madison, United States
| | - Coner Feldman
- Division of Plastic Surgery, Department of Surgery, University of Wisconsin-Madison, United States
| | - Mark Austin
- Department of Biomedical Engineering, University of Wisconsin-Madison, United States
| | - Sarah K Brodnick
- Department of Biomedical Engineering, University of Wisconsin-Madison, United States
| | - Nikita Shulzhenko
- Division of Plastic Surgery, Department of Surgery, University of Wisconsin-Madison, United States
| | - Ruston Sanchez
- Division of Plastic Surgery, Department of Surgery, University of Wisconsin-Madison, United States
| | - Wendell B Lake
- Department of Neurological Surgery, University of Wisconsin-Madison, United States
| | - Justin C Williams
- Department of Biomedical Engineering, University of Wisconsin-Madison, United States; Department of Neurological Surgery, University of Wisconsin-Madison, United States
| | - Samuel O Poore
- Division of Plastic Surgery, Department of Surgery, University of Wisconsin-Madison, United States; Department of Biomedical Engineering, University of Wisconsin-Madison, United States
| | - Aaron J Suminski
- Department of Biomedical Engineering, University of Wisconsin-Madison, United States; Department of Neurological Surgery, University of Wisconsin-Madison, United States.
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9
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Silberstein M, Nunn AK, Drummond PD, Wan DWL, Alexander J, Millard M, Galea MP. A Human Sensory Pathway Connecting the Foot to Ipsilateral Face That Partially Bypasses the Spinal Cord. Front Neurosci 2019; 13:519. [PMID: 31191224 PMCID: PMC6539214 DOI: 10.3389/fnins.2019.00519] [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: 01/07/2019] [Accepted: 05/06/2019] [Indexed: 11/13/2022] Open
Abstract
Human sensory transmission from limbs to brain crosses and ascends through the spinal cord. Yet, descriptions exist of ipsilateral sensory transmission as well as transmission after spinal cord transection. To elucidate a novel ipsilateral cutaneous pathway, we measured facial perfusion following painfully-cold water foot immersion in 10 complete spinal cord-injured patients, 10 healthy humans before and after lower thigh capsaicin C-fiber cutaneous conduction blockade, and 10 warm-immersed healthy participants. As in healthy volunteers, ipsilateral facial perfusion in spinal cord injured patients increased significantly. Capsaicin resulted in contralateral increase in perfusion, but only following cold immersion and not in 2 spinal cord-injured patients who underwent capsaicin administration. Supported by skin biopsy results from a healthy participant, we speculate that the pathway involves peripheral C-fiber cross-talk, partially bypassing the cord. This might also explain referred itch and jogger's migraine and it is possible that it may be amenable to training spinal-injured patients to recognize lower limb sensory stimuli.
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Affiliation(s)
- Morry Silberstein
- School of Molecular and Life Sciences, Curtin University, Perth, WA, Australia
- Victorian Spinal Cord Service, Austin Health, Melbourne, VIC, Australia
- *Correspondence: Morry Silberstein
| | - Andrew K. Nunn
- Victorian Spinal Cord Service, Austin Health, Melbourne, VIC, Australia
| | | | - Dawn Wong Lit Wan
- School of Health and Biomedical Sciences, RMIT University, Melbourne, VIC, Australia
| | - Janette Alexander
- Victorian Spinal Cord Service, Austin Health, Melbourne, VIC, Australia
| | - Melinda Millard
- Victorian Spinal Cord Service, Austin Health, Melbourne, VIC, Australia
| | - Mary P. Galea
- Victorian Spinal Cord Service, Austin Health, Melbourne, VIC, Australia
- Department of Medicine, University of Melbourne, Melbourne, VIC, Australia
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10
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Ceylan M, Yalcin A. Coexistence of Symptoms Associated with Trigeminal Pathways in Chronic and Episodic Migraine and the Effects on Quality of Life. PAIN MEDICINE 2018; 20:172-179. [DOI: 10.1093/pm/pny118] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Mustafa Ceylan
- Section of Radiology, Regional Education and Research Hospital, Erzurum, Turkey
| | - Ahmet Yalcin
- Section of Radiology, Regional Education and Research Hospital, Erzurum, Turkey
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11
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Goadsby PJ. Cluster headache and the trigeminal-autonomic reflex: Driving or being driven? Cephalalgia 2017; 38:1415-1417. [DOI: 10.1177/0333102417738252] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Peter J Goadsby
- Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience, King’s College London
- NIHR-Wellcome Trust, King’s Clinical Research Facility, King’s College Hospital, London, UK
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12
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Zagami A, Goadsby PJ, Edvinsson L. Extracranial Peptide Release following Stimulation of the Superior Sagittal Sinus in the Cat. Cephalalgia 2016. [DOI: 10.1177/0333102489009s10159] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- A.S. Zagami
- Department of Neurology, The Prince Henry Hospital and School of Medicine, University of New South Wales, Sydney, Australia
| | - Peter J. Goadsby
- Department of Neurology, The Prince Henry Hospital and School of Medicine, University of New South Wales, Sydney, Australia
| | - Lars Edvinsson
- Department of Internal Medicine University of Lund, Lund, Sweden
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13
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Affiliation(s)
- Geoffrey A Lambert
- Division of Neurology and Department of Medicine University of New South Wales, Australia
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14
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Drummond PD. Sympathetic Vascular Dilatation in Migraine and Cluster Headache. Cephalalgia 2016. [DOI: 10.1177/0333102489009s10115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Abstract
The presence of cranial autonomic symptoms in migraine is well known and thought to represent activation of the trigeminal parasympathetic reflex pathway similar to trigeminal autonomic cephalalgias. However, studies regarding the prevalence of these symptoms are few. The characteristics of migraineurs with cranial autonomic symptoms and the association of cranial autonomic symptoms with laterality of headache have never been studied in a clinic population. Seventy-eight consecutive subjects with migraine were recruited from the Headache Clinic of the Department of Psychiatry after exclusion of subjects with secondary headache. Their demographic data and detailed history of headache were noted and leading questions were asked regarding cranial autonomic symptoms. χ2 test and Fisher's exact test was used for categorical variables, whereas an independent sample t-test was applied on numerical data. Spearman's correlation was used for correlational analysis of categorical variables. Female subjects (78.2%) outnumbered males and the average duration of illness in the whole sample was 3.81 years. Migraine without aura (53.8%) was the commonest diagnosis, followed by migraine with aura (24.4%). Cranial autonomic symptoms were present in 73.1% of subjects and, commonly, they were ipsilateral to headache. Moreover, strictly unilateral cranial autonomic symptoms were reported by only 32% of patients. The anatomical side of headache did not affect the presence of autonomic symptoms. Those with or without autonomic symptoms did not differ with respect to gender, diagnosis, laterality of headache or associated symptoms except phonophobia, which was more common in subjects with autonomic symptoms ( P = 0.05). Those with autonomic symptoms had longer duration of illness ( P = 0.03) and longer headache episodes ( P = 0.04). In addition, sleep was ineffective in relieving their headache ( P = 0.02). Cranial autonomic symptoms are frequent in migraineurs and are common in subjects with long duration of illness and longer headache episodes. Clinical evidence in the present study suggests that subjects with cranial autonomic symptoms have a hyperactive efferent arm of trigeminal autonomic reflex. The connections of trigeminal nucleus with the locus coeruleus and dorsal raphe nucleus may account for the observed phenotypic differences between the two groups. Further research, however, is required to elucidate the underlying neural mechanisms of cranial autonomic symptoms in migraine.
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Affiliation(s)
- R Gupta
- Department of Psychiatry, University College of Medical Sciences and GTB Hospital, Shahdara, Delhi, India.
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16
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Drummond PD. Mechanisms of Autonomic Disturbance in the Face During and Between Attacks of Cluster Headache. Cephalalgia 2016; 26:633-41. [PMID: 16686902 DOI: 10.1111/j.1468-2982.2006.01106.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Lacrimation and nasal secretion during attacks of cluster headache appear to be due to massive trigeminal-parasympathetic discharge. In addition, the presence of oculo-sympathetic deficit and loss of thermoregulatory sweating and flushing on the symptomatic side of the forehead indicate that the cervical sympathetic pathway to the face is injured in a subgroup of cluster headache patients. In this review, it is argued that a peripheral rather than a central lesion produces signs of cervical sympathetic deficit, probably resulting from compression of the sympathetic plexus around the internal carotid artery. Although trigeminal-parasympathetic discharge appears to be the main trigger for vasodilation during attacks, supersensitivity to neurotransmitters such as vasoactive intestinal polypeptide, together with release of sympathetic vasoconstrictor tone, may boost facial blood flow in patients with cervical sympathetic deficit. In addition, parasympathetic neural discharge may provoke aberrant facial sweating during attacks in patients with cervical sympathetic deficit. Although neither trigeminal-parasympathetic discharge nor cervical sympathetic deficit appears to be the primary trigger for attacks of cluster headache, these autonomic disturbances could contribute to the rapid escalation of pain once the attack begins. For example, a pericarotid inflammatory process that excites trigeminal nociceptors might initiate neurogenic inflammation and trigeminal-parasympathetic vasodilation. To complete the loop, neurogenic inflammation and trigeminal-parasympathetic vasodilation could provoke the release of mast cell products, which aggravate inflammation and intensify trigeminal discharge.
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Affiliation(s)
- P D Drummond
- School of Psychology, Murdoch University, Perth, Western Australia.
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17
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Bain AR, Nybo L, Ainslie PN. Cerebral Vascular Control and Metabolism in Heat Stress. Compr Physiol 2016; 5:1345-80. [PMID: 26140721 DOI: 10.1002/cphy.c140066] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This review provides an in-depth update on the impact of heat stress on cerebrovascular functioning. The regulation of cerebral temperature, blood flow, and metabolism are discussed. We further provide an overview of vascular permeability, the neurocognitive changes, and the key clinical implications and pathologies known to confound cerebral functioning during hyperthermia. A reduction in cerebral blood flow (CBF), derived primarily from a respiratory-induced alkalosis, underscores the cerebrovascular changes to hyperthermia. Arterial pressures may also become compromised because of reduced peripheral resistance secondary to skin vasodilatation. Therefore, when hyperthermia is combined with conditions that increase cardiovascular strain, for example, orthostasis or dehydration, the inability to preserve cerebral perfusion pressure further reduces CBF. A reduced cerebral perfusion pressure is in turn the primary mechanism for impaired tolerance to orthostatic challenges. Any reduction in CBF attenuates the brain's convective heat loss, while the hyperthermic-induced increase in metabolic rate increases the cerebral heat gain. This paradoxical uncoupling of CBF to metabolism increases brain temperature, and potentiates a condition whereby cerebral oxygenation may be compromised. With levels of experimentally viable passive hyperthermia (up to 39.5-40.0 °C core temperature), the associated reduction in CBF (∼ 30%) and increase in cerebral metabolic demand (∼ 10%) is likely compensated by increases in cerebral oxygen extraction. However, severe increases in whole-body and brain temperature may increase blood-brain barrier permeability, potentially leading to cerebral vasogenic edema. The cerebrovascular challenges associated with hyperthermia are of paramount importance for populations with compromised thermoregulatory control--for example, spinal cord injury, elderly, and those with preexisting cardiovascular diseases.
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Affiliation(s)
- Anthony R Bain
- Centre for Heart Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia, Okanagan Campus, Kelowna, Canada
| | - Lars Nybo
- Department of Nutrition, Exercise and Sport Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Philip N Ainslie
- Centre for Heart Lung and Vascular Health, School of Health and Exercise Sciences, University of British Columbia, Okanagan Campus, Kelowna, Canada
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18
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Prakash S, Rathore C, Makwana P. Hemicrania continua with contralateral cranial autonomic features: a case report. J Headache Pain 2015; 16:21. [PMID: 25902939 PMCID: PMC4385230 DOI: 10.1186/s10194-015-0508-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Accepted: 02/27/2015] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Hemicrania continua is characterized by continuous strictly unilateral head pain with episodic exacerbations. Episodic exacerbations are associated with ipsilateral cranial autonomic features. CASE DESCRIPTION We report a 24-year female with a 2-year history of continuous right-sided headache with superimposed exacerbations. Episodic exacerbations were associated with marked agitation and contralateral cranial autonomic features. The patient showed a complete response to indomethacin within 8 hours. DISCUSSION The dichotomy of pain and autonomic features is in accordance with the concept about the possibility of two separate pathways for pain and autonomic features in trigeminal autonomic cephalalgias.
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Affiliation(s)
- Sanjay Prakash
- Department of Neurology, Smt B. K. Shah Medical institute and research Centre Medical College, Piperia, Waghodia, Vadodara, Gujarat, 391760, India.
| | - Chaturbhuj Rathore
- Department of Neurology, Smt B. K. Shah Medical institute and research Centre Medical College, Piperia, Waghodia, Vadodara, Gujarat, 391760, India.
| | - Prayag Makwana
- Department of Neurology, Smt B. K. Shah Medical institute and research Centre Medical College, Piperia, Waghodia, Vadodara, Gujarat, 391760, India.
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Gong CL, Leung YM, Wang MR, Lin NN, Lee TJF, Kuo JS. Neurochemicals involved in medullary control of common carotid blood flow. Curr Neuropharmacol 2014; 11:513-20. [PMID: 24403875 PMCID: PMC3763759 DOI: 10.2174/1570159x113119990044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 01/22/2013] [Accepted: 07/17/2013] [Indexed: 11/22/2022] Open
Abstract
The common carotid artery (CCA) supplies intra- and extra-cranial vascular beds. An area in the medulla controlling CCA blood flow is defined as the dorsal facial area (DFA) by Kuo et al. in 1987. In the DFA, presynaptic nitrergic and/or glutamatergic fibers innervate preganglionic nitrergic and/or cholinergic neurons which give rise to the preganglionic fibers of the parasympathetic 7th and 9th cranial nerves. Released glutamate from presynaptic nitrergic and/or glutamatergic fibers can activate N-methyl-D-aspartate (NMDA) and α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptors on preganglionic nitrergic and/or cholinergic neurons. By modulating this glutamate release, several neurochemicals including serotonin, arginine, nitric oxide, nicotine, choline and ATP in the DFA regulate CCA blood flow. Understanding the neurochemical regulatory mechanisms can provide important insights of the physiological roles of the DFA, and may help develop therapeutic strategies for diseases involving CCA blood flow, such as migraine, hypertensive disease, Alzheimer’s disease and cerebral ischemic stroke.
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Affiliation(s)
- Chi-Li Gong
- Department of Physiology, School of Medicine, China Medical University, Taiwan
| | - Yuk-Man Leung
- Department of Physiology, School of Medicine, China Medical University, Taiwan; ; Graduate Institute of Neural and Cognitive Sciences, China Medical University, Taiwan
| | - Ming-Ren Wang
- Yuhing Junior College of Health Care and Management, Kaohsiung, Taiwan
| | - Nai-Nu Lin
- Department of Education and Research, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Tony Jer-Fu Lee
- Neuro-Medical Scientific Center and Center for Vascular Medicine, Buddhist Tzu Chi General Hospital and Tzu Chi University, Hualien, Taiwan; ; Department of Medical Research, Buddhist Tzu Chi General Hospital and Tzu Chi University, Hualien, Taiwan
| | - Jon-Son Kuo
- Neuro-Medical Scientific Center and Center for Vascular Medicine, Buddhist Tzu Chi General Hospital and Tzu Chi University, Hualien, Taiwan; ; Department of Medical Research, Buddhist Tzu Chi General Hospital and Tzu Chi University, Hualien, Taiwan; ; Institute of Pharmacology and Toxicology, Tzu Chi University, Hualien, Taiwan
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Khan S, Schoenen J, Ashina M. Sphenopalatine ganglion neuromodulation in migraine: what is the rationale? Cephalalgia 2013; 34:382-91. [PMID: 24293088 DOI: 10.1177/0333102413512032] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE The objective of this article is to review the prospect of treating migraine with sphenopalatine ganglion (SPG) neurostimulation. BACKGROUND Fuelled by preliminary studies showing a beneficial effect in cluster headache patients, the potential of treating migraine with neurostimulation has gained increasing interest within recent years, as current treatment strategies often fail to provide adequate relief from this debilitating headache. Common migraine symptoms include lacrimation, nasal congestion, and conjunctival injection, all parasympathetic manifestations. In addition, studies have suggested that parasympathetic activity may also contribute to the pain of migraineurs. The SPG is the largest extracranial parasympathetic ganglion of the head, innervating the meninges, lacrimal gland, nasal mucosa, and conjunctiva, all structures involved in migraine with cephalic autonomic symptoms. CONCLUSION We propose two possible mechanisms of action: 1) interrupting the post-ganglionic parasympathetic outflow to inhibit the pain and cephalic autonomic symptoms, and 2) modulating the sensory processing in the trigeminal nucleus caudalis. To further explore SPG stimulation in migraineurs as regards therapeutic potential and mode of action, randomized clinical trials are warranted.
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Affiliation(s)
- Sabrina Khan
- Danish Headache Center and Department of Neurology, Glostrup Hospital, Faculty of Health & Medical Sciences, University of Copenhagen, Denmark
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22
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Goadsby PJ. Pathophysiology and Genetics of Trigeminal Autonomic Cephalalgias. Headache 2013. [DOI: 10.1002/9781118678961.ch16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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23
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Autonomic nervous system control of the cerebral circulation. HANDBOOK OF CLINICAL NEUROLOGY 2013; 117:193-201. [DOI: 10.1016/b978-0-444-53491-0.00016-x] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Drummond PD. Effects of a facial nerve lesion on responses in forehead microvessels to conjunctival irritation and paced breathing. Auton Neurosci 2012; 169:139-41. [PMID: 22647893 DOI: 10.1016/j.autneu.2012.05.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 05/02/2012] [Accepted: 05/03/2012] [Indexed: 10/28/2022]
Abstract
To investigate parasympathetic influences on the forehead microvasculature, blood flow was monitored bilaterally in seven participants with a unilateral facial nerve lesion during conjunctival irritation with Schirmer's strips and while breathing at 0.15 Hz. Blood flow and slow-wave frequency increased on the intact side of the forehead during Schirmer's test but did not change on the denervated side. However, a 0.15 Hz vascular wave strengthened during paced breathing, particularly on the denervated side. These findings indicate that parasympathetic activity in the facial nerve increases forehead blood flow during minor conjunctival irritation, but may interfere with the 0.15 Hz vascular wave.
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Affiliation(s)
- Peter D Drummond
- School of Psychology, Murdoch University, Perth, 6150 Western Australia, Australia.
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25
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Abstract
Object
Autonomic symptoms can occur in association with the facial pain of trigeminal neuralgia (TN). The distinction between first division (V1) TN and trigeminal autonomic cephalgias, particularly short-lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), can be difficult. The goal in this study was to investigate the frequency of autonomic symptoms with TN and to determine their effect on surgical outcome.
Methods
The authors sent questionnaires and reviewed the records of 92 patients who underwent surgical procedures for TN to obtain visual analog scale scores for pain before and after surgery and to determine the location of the pain and the presence of autonomic symptoms.
Results
Sixty-seven percent of patients had at least 1 autonomic symptom, and 14% had 4 or more autonomic symptoms associated with their pain. With V1 pain, the most common autonomic symptoms were conjunctival injection, ptosis, and excessive tearing. With pain involving the second division (V2), facial swelling was the most common autonomic symptom. Excessive salivation occurred most often when the pain involved the third division (V3). In patients who underwent microvascular decompression (MVD), visual analog scores for pain showed significantly greater improvement postoperatively in those who had no preoperative autonomic symptoms than in those who reported autonomic symptoms. There was also a significantly greater number of patients who were pain free postoperatively in the group without autonomic symptoms. There were 3 patients with V1 facial pain associated with conjunctival injection and tearing who, in retrospect, fulfilled all the current diagnostic criteria for SUNCT. These patients underwent MVD, during which a vessel was found to compress the trigeminal nerve. Postoperatively, the 3 patients experienced complete and long-lasting pain relief.
Conclusions
The presence of autonomic symptoms in TN correlated with a worse prognosis for pain relief after MVD. First division TN with autonomic symptoms can present identically to SUNCT but can respond to MVD if there is a compressive vessel. Neurosurgeons should be aware of SUNCT, especially in patients with V1 TN and autonomic symptoms, to ensure that all potential medical therapies have been tried prior to surgical treatment.
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Drummond PD, O'Brien G. Facial nerve activity disrupts psychomotor rhythms in the forehead microvasculature. Auton Neurosci 2011; 164:105-8. [PMID: 21764650 DOI: 10.1016/j.autneu.2011.06.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Revised: 04/23/2011] [Accepted: 06/15/2011] [Indexed: 11/25/2022]
Abstract
Forehead blood flow was monitored in seven participants with a unilateral facial nerve lesion during relaxation, respiratory biofeedback and a sad documentary. Vascular waves at 0.1Hz strengthened during respiratory biofeedback, in tune with breathing cycles that also averaged 0.1Hz. In addition, a psychomotor rhythm at 0.15Hz was more prominent in vascular waveforms on the denervated than intact side of the forehead, both before and during relaxation and the sad documentary. These findings suggest that parasympathetic activity in the facial nerve interferes with the psychomotor rhythm in the forehead microvasculature.
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Affiliation(s)
- Peter D Drummond
- School of Psychology, Murdoch University, Perth, Western Australia, Australia.
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Abstract
This article reviews the baffling problem of the pathophysiology behind a peripheral genesis of migraine pain--or more particularly the baffling problem of its absence. I examine a number of pathophysiological states and the effector mechanisms for these states and find most of them very plausible and that they are all supported by abundant evidence. However, this evidence is mostly indirect; to date the occurrence of any of the presumed pathological states has not been convincingly demonstrated. Furthermore, there is little evidence of increased trigeminal sensory traffic into the central nervous system during a migraine attack. The article also examines a number of observations and experimental programs used to bolster a theory of peripheral pathology and suggests reasons why they may in fact not bolster it. I suggest that a pathology, if one exists, may be in the brain and even that it may not be a pathology at all. Migraine headache might just happen because of random noise in an exquisitely sensitive and complex network. The article suggests an experimental program to resolve these issues.
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Affiliation(s)
- Geoffrey A Lambert
- Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Australia
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28
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Kaube H, Hoskin K, Goadsby P. Acetylsalicylic acid inhibits cerebral cortical vasodilatation caused by superior sagittal sinus stimulation in the cat*. Eur J Neurol 2011; 1:141-6. [DOI: 10.1111/j.1468-1331.1994.tb00062.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Prieto Peres MF, Valença MM. Headache endocrinological aspects. HANDBOOK OF CLINICAL NEUROLOGY 2010; 97:717-37. [PMID: 20816466 DOI: 10.1016/s0072-9752(10)97060-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In this chapter we review the current understanding of how hormones, neurohormones, and neurotransmitters participate in the pain modulation of primary headaches. Stressful conditions and hormones intimately implicated in headache neurobiology are also discussed. With the recent progress in neuroimaging techniques and the development of animal models to study headache mechanisms, the physiopathology of several of the primary headaches is starting to be better understood. Various clinical characteristics of the primary headaches, such as pain, autonomic disturbances, and behavioral changes, are linked to hypothalamic brainstem activation and hormonal influence. Headache is greatly influenced by the circadian circle. Over the millennia the nervous system has evolved to meet changing environmental conditions, including the light-dark cycle, in order to ensure survival and reproduction. The main elements for synchronization between internal biological events and the external environment are the pineal gland and its main secretory product, melatonin. Melatonin is believed to be a significant element in migraine and in other headache disorders, which has implications for treatment. A potential therapeutic use of melatonin has been considered in several headache syndromes. In short, primary headaches are strongly influenced by physiological hormonal fluctuations, when nociceptive and non-nociceptive pathways are differentially activated to modulate the perception of pain.
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Waldenlind E, Sjöstrand C. Pathophysiology of cluster headache and other trigeminal autonomic cephalalgias. HANDBOOK OF CLINICAL NEUROLOGY 2010; 97:389-411. [PMID: 20816439 DOI: 10.1016/s0072-9752(10)97033-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Elisabet Waldenlind
- Department of Neurology, Karolinska University Hospital/Karolinska Institutet, Stockholm, Sweden.
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31
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Neurobiology of migraine. Neuroscience 2009; 161:327-41. [DOI: 10.1016/j.neuroscience.2009.03.019] [Citation(s) in RCA: 290] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2008] [Revised: 02/28/2009] [Accepted: 03/04/2009] [Indexed: 01/27/2023]
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32
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Ishii H, Niioka T, Izumi H. Difference between male and female rats in cholinergic activity of parasympathetic vasodilatation in the masseter muscle. Arch Oral Biol 2009; 54:533-42. [DOI: 10.1016/j.archoralbio.2009.02.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2008] [Revised: 01/30/2009] [Accepted: 02/18/2009] [Indexed: 11/28/2022]
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Rahmann A, Wienecke T, Hansen JM, Fahrenkrug J, Olesen J, Ashina M. Vasoactive Intestinal Peptide Causes Marked Cephalic Vasodilation, but does not Induce Migraine. Cephalalgia 2008; 28:226-36. [DOI: 10.1111/j.1468-2982.2007.01497.x] [Citation(s) in RCA: 191] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We hypothesized that intravenous infusion of the parasympathetic transmitter, vasoactive intestinal peptide (VIP), might induce migraine attacks in migraineurs. Twelve patients with migraine without aura were allocated to receive 8 pmol kg-1 min-1 VIP or placebo in a randomized, double-blind crossover study. Headache was scored on a verbal rating scale (VRS), mean blood flow velocity in the middle cerebral artery ( Vmean mca) was measured by transcranial Doppler ultrasonography, and diameter of the superficial temporal artery (STA) by high-frequency ultrasound. None of the subjects reported a migraine attack after VIP infusion. VIP induced a mild immediate headache (maximum 2 on VRS) compared with placebo ( P = 0.005). Three patients reported delayed headache (3-11 h after infusion) after VIP and two after placebo ( P = 0.89). Vmean mca decreased (16.3 ± 5.9%) and diameter of STA increased significantly after VIP (45.9 ± 13.9%). VIP mediates a marked dilation of cranial arteries, but does not trigger migraine attacks in migraineurs. These data provide further evidence against a purely vascular origin of migraine.
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Affiliation(s)
- A Rahmann
- Danish Headache Centre, Department of Neurology, Glostrup Hospital
- Department of Neurology, University Hospital Münster, Münster, Germany
| | - T Wienecke
- Danish Headache Centre, Department of Neurology, Glostrup Hospital
| | - JM Hansen
- Danish Headache Centre, Department of Neurology, Glostrup Hospital
| | - J Fahrenkrug
- Department of Clinical Biochemistry, Bispebjerg Hospital, University of Copenhagen, Denmark
| | - J Olesen
- Danish Headache Centre, Department of Neurology, Glostrup Hospital
| | - M Ashina
- Danish Headache Centre, Department of Neurology, Glostrup Hospital
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Watanabe H, Ishii H, Niioka T, Yamamuro M, Izumi H. Occurrence of parasympathetic vasodilator fibers in the lower lip of the guinea-pig. J Comp Physiol B 2007; 178:297-305. [PMID: 18030480 DOI: 10.1007/s00360-007-0222-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2007] [Revised: 10/30/2007] [Accepted: 11/06/2007] [Indexed: 11/30/2022]
Abstract
The present study was designed to examine whether there are parasympathetic vasodilator fibers in the lower lip of the guinea-pig. Electrical stimulation of the central cut end of the lingual nerve of guinea-pigs evoked intensity- and frequency-dependent decreases in lower lip blood flow and systemic arterial blood pressure (SABP). Pretreatment with guanethidine, a postganglionic sympathetic nerve blocker and antihypertensive drug (30 mg kg(-1), s.c., 24 h prior to experiments), reduced the magnitude of the decrease in SABP while the intensity- and frequency-dependent increases of the lip blood flow occurred by the lingual nerve stimulation only on the side ipsilateral to stimulation. Increases in the lip blood flow evoked by lingual nerve stimulation in guanethidine pretreated guinea-pigs were reduced by hexamethonium (an autonomic ganglion cholinergic blocker) in a dose-dependent manner. When fluoro-gold (a retrograde neural tracer) was injected into the lower lip, labeled neurons were observed in the ipsilateral otic ganglion. The present study indicates the presence of parasympathetic vasodilator fibers originating from the otic parasympathetic ganglion in the guinea-pig lower lip, similar to those reported previously in rats, cats, rabbits and humans.
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Affiliation(s)
- H Watanabe
- Department of Pain Control, Tohoku University, Graduate School of Medicine, Sendai, 980-8574, Japan
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35
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Goadsby PJ. Neuromodulatory approaches to the treatment of trigeminal autonomic cephalalgias. ACTA NEUROCHIRURGICA. SUPPLEMENT 2007; 97:99-110. [PMID: 17691295 DOI: 10.1007/978-3-211-33081-4_12] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The trigeminal autonomic cephalalgias (TACs) are a group of primary headache syndromes characterised by intense pain and associated activation of cranial parasympathetic autonomic outflow pathways out of proportion to the pain. The TACs include cluster headache, paroxysmal hemicrania and SUNCT (short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing). The pathophysiology of these syndromes involves activation of the trigeminal-autonomic reflex, whose afferent limb projects into the trigeminocervical complex in the caudal brainstem and upper cervical spinal cord. Functional brain imaging has shown activations in the posterior hypothalamic grey matter in TACs. This paper reviews the anatomy and physiology of these conditions and the brain imaging findings. Current treatments are summarised and the role of neuromodulation procedures, such as occipital nerve stimulation and deep brain stimulation in the posterior hypothalamus are reviewed. Neuromodulatory procedures are a promising avenue for these highly disabled patients with treatment refractory TACs.
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Affiliation(s)
- P J Goadsby
- The National Hospital for Neurology and Neurosurgery, Institute of Neurology, Queen Square, London, UK.
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36
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Drummond PD. Immersion of the hand in ice water releases adrenergic vasoconstrictor tone in the ipsilateral temple. Auton Neurosci 2006; 128:70-5. [PMID: 16627008 DOI: 10.1016/j.autneu.2006.03.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2006] [Accepted: 03/08/2006] [Indexed: 02/07/2023]
Abstract
Immersion of the hand in painfully cold water induces cutaneous vasodilatation in the temples, more so ipsilaterally than contralaterally. To investigate the mechanism of this response, guanethidine or saline was administered by transcutaneous iontophoresis to a recording site in the temple of ten participants before they immersed one of their hands in ice water. Guanethidine displaces noradrenaline from sympathetic nerve terminals and inhibits sympathetic noradrenergic neurotransmission. Therefore, it was hypothesized that guanethidine pre-treatment would block vasodilatation mediated by release of sympathetic vasoconstrictor tone in cutaneous vessels in the temple. During hand immersion, increases in the amplitude of the pulse waveform detected by laser Doppler flowmetry were greater in the ipsilateral than contralateral temple (86% vs. 34% above baseline, p<0.05), and pre-treatment with guanethidine prevented this asymmetric response (ipsilateral response 21% above baseline and contralateral response 32%, difference not significant). Guanethidine also inhibited ipsilateral increases in cutaneous blood flow during hand immersion in responsive participants. These findings suggest that limb pain inhibited ipsilateral adrenergic vasoconstrictor outflow in the temple. Thus, the findings challenge the concept of the sympathetic nervous system as a "mass action" system that discharges in unison to meet environmental demands. Instead, they suggest that the sympathetic nervous system is highly differentiated, with separate control of discrete reflex pathways on each side of the body.
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Affiliation(s)
- Peter D Drummond
- School of Psychology, Murdoch University, Perth, 6150 Western Australia.
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37
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38
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Bulbar Pathway for Parasympathetic Reflex Vasodilatation in Orofacial Area. J Oral Biosci 2005. [DOI: 10.1016/s1349-0079(05)80028-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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39
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Abstract
Calcitonin gene-related peptide (CGRP) is a potent neuromodulator that is expressed in the trigeminovascular system and is released into the cranial circulation in various primary headaches. CGRP is released in migraine, cluster headache and paroxysmal hemicrania. The blockade of its release is associated with the successful treatment of acute migraine and cluster headache. CGRP receptor blockade has recently been shown to be an effective acute anti-migraine strategy and is non-vasoconstricting in terms of the mechanism of action. The prospect of a non-vasoconstricting therapy for acute migraine offers a real opportunity to patients, and perhaps more importantly, provides a therapeutic rationale to reinforce migraine as a neurological disorder.
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Affiliation(s)
- Peter J Goadsby
- Headache Group, Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, UK.
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40
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Mizuta K, Izumi H. Bulbar pathway for contralateral lingual nerve-evoked reflex vasodilatation in cat palate. Brain Res 2004; 1020:86-94. [PMID: 15312790 DOI: 10.1016/j.brainres.2004.06.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/09/2004] [Indexed: 11/17/2022]
Abstract
We investigated the brain-stem pathway(s) by which electrical stimulation of the central cut end of the lingual nerve (LN) evokes parasympathetic reflex vasodilatation in the palate contralateral to the stimulated side. This occurs in artificially ventilated, cervically vagosympathectomized cats deeply anesthetized with alpha-chloralose and urethane. For this purpose, we made microinjections within the brain stem to produce nonselective, reversible local anesthesia (lidocaine) or soma-selective, irreversible neurotoxic damage (kainic acid). Local anesthesia of the trigeminal spinal nucleus (Vsp) ipsilateral to the stimulated side produced by microinjection of lidocaine (2%; 1 microl/site) reversibly and significantly reduced the LN stimulus-evoked palatal blood flow (PBF) increases. PBF increases ipsilateral and contralateral to the stimulated nerve were equally affected. In contrast, microinjection of lidocaine into the Vsp contralateral to the stimulated side did not affect these responses. Microinjection of kainic acid (10 mM/site; 1 microl) into the Vsp ipsilateral to the stimulated side led to a bilateral irreversible reduction in reflex vasodilatation in the palate. Microinjection of lidocaine into either superior salivatory nucleus (SSN) attenuated the PBF increase only on the side ipsilateral to the microinjection site. Hexamethonium (1.0 mg/kg iv) significantly reduced the vasodilator responses to electrical stimulation of Vsp by blocking ganglionic transmission on both sides. The simplest interpretation of these results is that the LN-evoked parasympathetic reflex vasodilatation in the contralateral palate depends on activation of a pathway originating from the Vsp ipsilateral to the stimulated nerve and crossing to the contralateral SSN.
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Affiliation(s)
- Kentaro Mizuta
- Department of Dento-oral Anesthesiology, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
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41
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Gürelik M, Karadağ O, Polat S, Ozüm U, Aslan A, Gürelik B, Göksel HM. The effects of the electrical stimulation of the nasal mucosa on cortical cerebral blood flow in rabbits. Neurosci Lett 2004; 365:210-3. [PMID: 15246550 DOI: 10.1016/j.neulet.2004.04.079] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2004] [Revised: 04/19/2004] [Accepted: 04/30/2004] [Indexed: 11/24/2022]
Abstract
The cerebral vessels have sympathetic, parasympathetic, and sensory innervations. A sensory innervation of the cerebral vessels originating in the trigeminal ganglion has been described in a number of species by several investigations. It has been shown that the electrical stimulation of the trigeminal ganglion causes an increase of cerebral blood flow (CBF). The aim of our present study is to stimulate the trigeminal ganglion with an extracranial and non-invasive method. A stimulating electrode was put in the nasal mucosa via right nares of rabbits and trigeminal ganglion was stimulated orthodromically via nasociliary nerve (NCN). Variations in the cortical CBF were evaluated by laser Doppler flowmetry. In experiment group, CBF increased together with the beginning of electrical stimulation. The flow values were remained high as long as the stimulation. In post-stimulation period, the CBF was decreased gradually and returned to the baseline values at 120s. This study demonstrated that the electrical stimulation of the NCN branch of the trigeminal nerve increases the cortical CBF under physiological conditions.
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Affiliation(s)
- M Gürelik
- Department of Neurosurgery, Faculty of Medicine, Cumhuriyet University, 58140 Sivas, Turkey.
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VASS Z, DAI CF, STEYGER PS, JANCSÓ G, TRUNE DR, NUTTALL AL. Co-localization of the vanilloid capsaicin receptor and substance P in sensory nerve fibers innervating cochlear and vertebro-basilar arteries. Neuroscience 2004; 124:919-27. [PMID: 15026132 PMCID: PMC3960301 DOI: 10.1016/j.neuroscience.2003.12.030] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/11/2003] [Indexed: 12/21/2022]
Abstract
Evidence suggests that capsaicin-sensitive substance P (SP)-containing trigeminal ganglion neurons innervate the spiral modiolar artery (SMA), radiating arterioles, and the stria vascularis of the cochlea. Antidromic electrical or chemical stimulation of trigeminal sensory nerves results in neurogenic plasma extravasation in inner ear tissues. The primary aim of this study was to reveal the possible morphological basis of cochlear vascular changes mediated by capsaicin-sensitive sensory nerves. Therefore, the distribution of SP and capsaicin receptor (transient receptor potential vanilloid type 1-TRPV1) was investigated by double immunolabeling to demonstrate the anatomical relationships between the cochlear and vertebro-basilar blood vessels and the trigeminal sensory fiber system. Extensive TRPV1 and SP expression and co-localization were observed in axons within the adventitial layer of the basilar artery, the anterior inferior cerebellar artery, the SMA, and the radiating arterioles of the cochlea. There appears to be a functional relationship between the trigeminal ganglion and the cochlear blood vessels since electrical stimulation of the trigeminal ganglion induced significant plasma extravasation from the SMA and the radiating arterioles. The findings suggest that stimulation of paravascular afferent nerves may result in permeability changes in the basilar and cochlear vascular bed and may contribute to the mechanisms of vertebro-basilar type of headache through the release of SP and stimulation of TPVR1, respectively. We propose that vertigo, tinnitus, and hearing deficits associated with migraine may arise from perturbations of capsaicin-sensitive trigeminal sensory ganglion neurons projecting to the cochlea.
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Affiliation(s)
- Z. VASS
- Department of Otolaryngology, Albert Szent-Györgyi Medical University, Szeged, Hungary H-6725
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, OR 97239-3098, USA
| | - C. F. DAI
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, OR 97239-3098, USA
- Department of Otolaryngology, Eye Ear Nose and Throat Hospital, Fudan University, Shanghai 200031, People's Republic of China
| | - P. S. STEYGER
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, OR 97239-3098, USA
| | - G. JANCSÓ
- Department of Physiology, Albert Szent-Györgyi Medical University, Szeged, Hungary H-6720
| | - D. R. TRUNE
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, OR 97239-3098, USA
| | - A. L. NUTTALL
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, OR 97239-3098, USA
- Kresge Hearing Research Institute, Department of Otolaryngology, University of Michigan, Ann Arbor, MI 48109-0506, USA
- Correspondence to: A. L. Nuttall, Oregon Hearing Research Center, NRC04, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239-3098, USA. Tel: +1-503-494-8032; fax: +1-503-494-5656. (A. L. Nuttall)
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43
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Abstract
This article discusses cluster headache and a variety of cluster mimics, with the intention of aiding the practitioner in differentiating between primary cluster headache and secondary forms of cluster. Secondary causes of cluster headache include infections, tumors, vascular abnormalities, and head trauma. In addition, other trigeminal autonomic cephalgias occasionally can be difficult to distinguish from primary cluster headache.
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Atalay B, Bolay H, Dalkara T, Soylemezoglu F, Oge K, Ozcan OE. Transcorneal stimulation of trigeminal nerve afferents to increase cerebral blood flow in rats with cerebral vasospasm: a noninvasive method to activate the trigeminovascular reflex. J Neurosurg 2002; 97:1179-83. [PMID: 12450041 DOI: 10.3171/jns.2002.97.5.1179] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT The goal of this study was to investigate whether stimulation of trigeminal afferents in the cornea could enhance cerebral blood flow (CBF) in rats after they have been subjected to experimental subarachnoid hemorrhage (SAH). Cerebral vasospasm following SAH may compromise CBF and increase the risks of morbidity and mortality. Currently, there is no effective treatment for SAH-induced vasospasm. Direct stimulation of the trigeminal nerve has been shown to dilate constricted cerebral arteries after SAH; however, a noninvasive method to activate this nerve would be preferable for human applications. The authors hypothesized that stimulation of free nerve endings of trigeminal sensory fibers in the face might be as effective as direct stimulation of the trigeminal nerve. METHODS Autologous blood obtained from the tail artery was injected into the cisterna magna of 10 rats. Forty-eight and 96 hours later (five rats each) trigeminal afferents were stimulated selectively by applying transcorneal biphasic pulses (1 msec, 3 mA, and 30 Hz), and CBF enhancements were detected using laser Doppler flowmetry in the territory of the middle cerebral artery. Stimulation-induced changes in cerebrovascular parameters were compared with similar parameters in sham-operated controls (six rats). Development of vasospasm was histologically verified in every rat with SAH. Corneal stimulation caused an increase in CBF and blood pressure and a net decrease in cerebrovascular resistance. There were no significant differences between groups for these changes. CONCLUSIONS Data from the present study demonstrate that transcorneal stimulation of trigeminal nerve endings induces vasodilation and a robust increase in CBF. The vasodilatory response of cerebral vessels to trigeminal activation is retained after SAH-induced vasospasm.
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Affiliation(s)
- Basar Atalay
- Department of Neurosurgery, Faculty of Medicine, Hacettepe University, Ankara, Turkey.
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45
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Abstract
Cluster headache is a form of primary neurovascular headache with the following features: severe unilateral, commonly retro-orbital, pain accompanied by restlessness or agitation, and cranial (parasympathetic) autonomic symptoms, such as lacrimation or conjunctival injection. It occurs in attacks typically of less than 3 h in length and in bouts (clusters) of a few months during which the patient has one or two attacks per day. The individual attack involves activation of the trigeminal-autonomic reflex; thus, such headaches can be broadly classified with the other trigeminal-autonomic cephalgias, such as paroxysmal hemicrania and the syndrome of short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing. Observations of circadian biological changes and neuroendocrine disturbances have suggested a pivotal role for the hypothalamus in cluster headache. Functional neuroimaging with PET and anatomical imaging with voxel-based morphometry have identified the posterior hypothalamic grey matter as the key area for the basic defect in cluster headache.
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Affiliation(s)
- Peter J Goadsby
- Institute of Neurology, the National Hospital for Neurology and Neurosurgery, Queen Square, London, UK.
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46
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Affiliation(s)
- Peter J Goadsby
- Headache Group, Institute of Neurology, The National Hospital for Neurology and Neurosurgery, Queen Square, London, UK. peterg@.ion.ucl.ac.uk
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47
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Bolay H, Reuter U, Dunn AK, Huang Z, Boas DA, Moskowitz MA. Intrinsic brain activity triggers trigeminal meningeal afferents in a migraine model. Nat Med 2002; 8:136-42. [PMID: 11821897 DOI: 10.1038/nm0202-136] [Citation(s) in RCA: 799] [Impact Index Per Article: 36.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Although the trigeminal nerve innervates the meninges and participates in the genesis of migraine headaches, triggering mechanisms remain controversial and poorly understood. Here we establish a link between migraine aura and headache by demonstrating that cortical spreading depression, implicated in migraine visual aura, activates trigeminovascular afferents and evokes a series of cortical meningeal and brainstem events consistent with the development of headache. Cortical spreading depression caused long-lasting blood-flow enhancement selectively within the middle meningeal artery dependent upon trigeminal and parasympathetic activation, and plasma protein leakage within the dura mater in part by a neurokinin-1-receptor mechanism. Our findings provide a neural mechanism by which extracerebral cephalic blood flow couples to brain events; this mechanism explains vasodilation during headache and links intense neurometabolic brain activity with the transmission of headache pain by the trigeminal nerve.
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Affiliation(s)
- Hayrunnisa Bolay
- Stroke and Neurovascular Regulation Laboratory, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
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48
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Vass Z, Steyger PS, Hordichok AJ, Trune DR, Jancsó G, Nuttall AL. Capsaicin stimulation of the cochlea and electric stimulation of the trigeminal ganglion mediate vascular permeability in cochlear and vertebro-basilar arteries: a potential cause of inner ear dysfunction in headache. Neuroscience 2001; 103:189-201. [PMID: 11311800 DOI: 10.1016/s0306-4522(00)00521-2] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Trigeminal neurogenic inflammation is one explanation for the development of vascular migraine. The triggers for this inflammation and pain are not well understood, but are probably vasoactive components acting on the blood vessel wall. Migraine-related inner ear symptoms like phonophobia, tinnitus, fluctuation in hearing perception and increased noise sensitivity provide indirect evidence that cochlear blood vessels are also affected by basilar artery migraine. The purpose of this investigation was to determine if a functional connection exists between the cochlea and the basilar artery. Neuronally mediated permeability changes in the cochlea and basilar artery were measured by colloidal silver and Evans Blue extravasation, following orthodromic and antidromic stimulation of the trigeminal ganglion innervating the cochlea. Capsaicin and electrical stimulation induced both dose- and time-dependent plasma extravasation of colloidal silver and Evans Blue from the basilar artery and anterior inferior cerebellar artery. Both orthodromic and antidromic activation of trigeminal sensory fibers also induced cochlear vascular permeability changes and significant quantitative differences between the treated and control groups in spectrophotometric assays. These results characterize a vasoactive connection between the cochlea and vertebro-basilar system through the trigeminal sensory neurons. We propose that vertigo, tinnitus and hearing deficits associated with basilar migraine could arise by excitation of the trigeminal nerve fibers in the cochlea, resulting in local plasma extravasation. In addition, cochlear "dysfunction" may also trigger basilar and cluster headache by afferent input to the trigeminal system.
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Affiliation(s)
- Z Vass
- Department of Otolaryngology, Albert Szent-Györgyi Medical University, Szeged H-6725, Hungary
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49
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Abstract
Neuroimaging of primary headache syndromes, such as cluster headache and migraine, has begun to provide a glimpse of the neuroanatomical and physiological basis of the conditions. Although these headache types have been widely described as vascular, there is now considerable imaging and clinical evidence to suggest that they are primarily driven from the brain. The shared anatomical and physiological substrate for both of these clinical problems is the neural innervation of the cranial circulation. Functional imaging with positron emission tomography (PET) has shed light on the genesis of both syndromes, documenting activation in the midbrain and pons in migraine, and in the hypothalamic grey in cluster headache. These areas are involved not simply as a response to first division nociceptive pain impulses but specifically in each syndrome, probably in some permissive or dysfunctional role. In a recent PET study in cluster headache, as well as brain activation, tracer pooled in the region of the major basal arteries. This is likely to be due to vasodilatation of these vessels during the acute pain-attack and represents the first convincing activation of neural vasodilator mechanisms in humans. The author takes the view that the known physiology and pathophysiology of the systems involved dictate that these disorders should be collectively regarded as neurovascular headaches to place emphasis on the interaction between nerves and vessels, which is the underlying characteristic of these syndromes. Understanding this neurovascular relationship facilitates an understanding of the pain mechanisms, while characterising the CNS dysfunction will ultimately allow us to dissect out the basic pathogenesis of these disorders.
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Affiliation(s)
- P J Goadsby
- Institute of Neurology, The National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, United Kingdom.
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50
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Parsons AA, Bingham S, Raval P, Read S, Thompson M, Upton N. Tonabersat (SB-220453) a novel benzopyran with anticonvulsant properties attenuates trigeminal nerve-induced neurovascular reflexes. Br J Pharmacol 2001; 132:1549-57. [PMID: 11264249 PMCID: PMC1572685 DOI: 10.1038/sj.bjp.0703932] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
1. The effects of tonabersat (SB-220453) were evaluated on trigeminal nerve ganglion stimulation-induced sensory-autonomic neurovascular reflexes in the anaesthetized cat. Comparisons were made to intravenous administration of carabersat (SB-204269), and to valproate, gabapentin and lamotrigine following intraduodenal administration. 2. There were no effects on resting blood pressure, heart rate, carotid blood flow or carotid vascular resistance for any compound evaluated. 3. Trigeminal nerve ganglion stimulation increased carotid blood flow by 65% and reduced vascular resistance by 41% with minimal effect on blood pressure (< 10%) and no effect on heart rate. Intravenous infusion of tonabersat or carabersat (both 3.4 micromol h(-1)) produced time related reductions in stimulation-induced responses with a maximal inhibition (relative to control) of 30 +/- 7% (n=4), at 240 min for tonabersat and 33+/-4% (n=3) at 180 min for carabersat. Tonabersat (11.5 micromol h(-1)) produced a similar inhibitory effect (32 +/- 9%, n=4) after 120 min of infusion. 4. Following intraduodenal administration of tonabersat, the maximal inhibition of nerve stimulation-induced responses was 55 +/- 4% at 120 min (n=4) for tonabersat 10 mg kg(-1), and 24+/-2% after 180 min for 1 mg kg(-1) (n=4). 5. Intraduodenal administration of sodium valproate (10 or 100 mg kg(-1) n=4/group) had no effect on neurovascular reflexes. Maximal inhibition of nerve ganglion-stimulated reductions in carotid vascular resistance were observed at 150 min for lamotrigine (50 mg kg(-1), 52+/-12%, n=4) and gabapentin (100 mg kg(-1), 17+/-13%, n=3). Lamotrigine 10 mg kg(-1) produced 22+/-11% (n=3) inhibition after 180 min. 6. These data demonstrate blockade of trigeminal parasympathetic reflexes with tonabersat, carabersat and other anticonvulsants. These agents may therefore have therapeutic benefit in conditions where this type of reflex is evident.
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Affiliation(s)
- A A Parsons
- Neurosciences Research, SmithKline Beecham Pharmaceuticals, New Frontiers Science Park, Harlow, Essex CM19 5AW
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