References of "MAGIS, Delphine"
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See detailCentral neuromodulation in cluster headache patients treated with occipital nerve stimulators: A PET study
Magis, Delphine ULg; Bruno, Marie-Aurélie ULg; Fumal, Arnaud ULg et al

in Acta Neurologica Belgica (2010), 110(Suppl 1), 17

OBJECTIVES: Use functional brain imaging to explore activity changes in centres involved in trigeminal pain processing and control before and after occipital neurostimulation in drug-resistant chronic ... [more ▼]

OBJECTIVES: Use functional brain imaging to explore activity changes in centres involved in trigeminal pain processing and control before and after occipital neurostimulation in drug-resistant chronic cluster headache patients. BACKGROUND: Occipital nerve stimulation (ONS) provides relief to about 60% of patients suffering from drug-resistant chronic cluster headache (drCCH). Its mode of action, however, remains elusive, but the long latency to meaningful effect suggests that ONS induces slow neuromodulation. METHODS: Ten drCCH patients underwent an 18FDG-PET scan after ONS durations varying between 0 and 30 months. All were scanned with ongoing ONS (ON) and with the stimulator switched OFF. RESULTS: After 6-30 months of ONS, 3 patients were pain free and 4 had a ≥ 90% reduction of attack frequency (responders). In patients overall compared to controls, several areas of the pain matrix were hypermetabolic: ipsilateral hypothalamus, midbrain and ipsilateral lower pons. All normalized after ONS, except the hypothalamus. Switching ON or OFF the stimulator had little influence on brain glucose metabolism. The perigenual anterior cingulate cortex (PACC) was hyperactive in ONS responders compared to non-responders. INTERPRETATION AND CONCLUSIONS: Metabolic normalization in the pain neuromatrix and lack of short-term changes induced by the stimulation support the hypothesis that ONS acts in drCCH through slow neuromodulatory processes. Selective activation in responders of PACC, a pivotal structure in the endogenous opioid system, suggests that ONS may restore balance within dysfunctioning pain control centres. That ONS is nothing but a symptomatic treatment might be illustrated by the persistent hypothalamic hypermetabolism which could explain why autonomic attacks may persist despite pain relief and why cluster attacks recur shortly after stimulator arrest. [less ▲]

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See detailNeurostimulation therapy in intractable headaches.
Schoenen, Jean ULg; Allena, Marta; Magis, Delphine ULg

in Handbook of clinical neurology / edited by P.J. Vinken and G.W. Bruyn (2010), 97

A proportion of chronic headache patients become refractory to medical treatment and severely disabled. In such patients various neurostimulation methods have been proposed, ranging from invasive ... [more ▼]

A proportion of chronic headache patients become refractory to medical treatment and severely disabled. In such patients various neurostimulation methods have been proposed, ranging from invasive procedures such as deep-brain stimulation to minimally invasive ones like occipital nerve stimulation. They have been applied in single cases or small series of patients affected with varying headache disorders: cervicogenic headache, hemicrania continua, posttraumatic headache, chronic migraine, and cluster headache. Although favorable results were reported overall, it is premature to consider neurostimulation as a treatment with established utility in refractory headaches. At present, the most detailed clinical studies have been performed in intractable chronic cluster headache (iCCH) patients, who represent about 1% of all chronic cluster headache (CCH) patients. Various lesional interventions have been attempted in these patients, none with lasting benefits. In recent years, non-destructive neurostimulation methods have raised new hope. Hypothalamic deep-brain stimulation (hDBS) acts rapidly and has lasting efficacy, but is not without risk. Occipital nerve stimulation (ONS) was studied in two trials on a total of 17 iCCH patients. Clinical efficacy was found to be very satisfactory by most patients and by the investigators. Although slightly less efficacious than hDBS, ONS has the advantage of being rather harmless and reversible. At this stage, it should be preferred as first-line invasive therapy for iCCH. Recent case reports mention the efficacy of supraorbital (SNS) and vagal (VNS) nerve stimulation. Whether these neurostimulation methods have a place in the management of iCCH patients remains to be determined. [less ▲]

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See detailMigraine - clinical neurophysiology.
Ambrosini, Anna; Magis, Delphine ULg; Schoenen, Jean ULg

in Nappi, G.; Moskowitz, M. (Eds.) Headache (2010)

Central nervous system (CNS) dysfunction is thought to be pivotal in migraine, and could occur at several levels: the brain (the cortex and its connections with subcortical nuclei), the brainstem, and ... [more ▼]

Central nervous system (CNS) dysfunction is thought to be pivotal in migraine, and could occur at several levels: the brain (the cortex and its connections with subcortical nuclei), the brainstem, and even peripheral structures (e.g., trigeminal ganglion and nerve). As it is particularly suited to functional evaluation of various components of the nervous system, neurophysiological testing has become a valuable tool for investigating migraine pathophysiology and the effects of pharmacological treatment. However it has limited value for migraine diagnosis because of a high interindividual variability. In this chapter, we critically review and summarize the available published literature on neurophysiological approaches in migraine, i.e., electroencephalography, evoked and event-related potentials, transcranial magnetic stimulation (TMS), electromyography, and cerebellar testing. The most relevant techniques for understanding migraine pathophysiological mechanisms are highlighted. [less ▲]

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See detailOccipital nerve stimulation for drug-resistant chronic cluster headache: long term follow-up up to 3 years
Gérardy, Pierre-Yves ULg; Magis, Delphine ULg; Allena, M. et al

in Cephalalgia : An International Journal of Headache (2009, January), 29(1),

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See detailMitochondrial DNA haplogroups influence response to Riboflavin in Migraineurs
Di Lorenzo, C.; Coppola, G.; Santorelli, F. et al

in Cephalalgia : An International Journal of Headache (2009, January), 29(1),

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See detailMitochondrial DNA haplogroups influence the therapeutic response to riboflavin in migraineurs.
Di Lorenzo, C.; Pierelli, F.; Coppola, G. et al

in Neurology (2009), 72(18), 1588-94

OBJECTIVES: In migraine, an interictal reduction of mitochondrial energy metabolism and a preventive effect of high-dose riboflavin were reported. To explore the relation between the two, we tested if the ... [more ▼]

OBJECTIVES: In migraine, an interictal reduction of mitochondrial energy metabolism and a preventive effect of high-dose riboflavin were reported. To explore the relation between the two, we tested if the therapeutic response to riboflavin is associated with specific mitochondrial DNA (mtDNA) haplogroups. We focused our attention on haplogroup H, which is known to differ from others in terms of energy metabolism. METHODS: Sixty-four migraineurs completed a 4-month open trial with riboflavin (400 mg QD) and were genotyped blindly for mtDNA haplogroups. RESULTS: Forty patients responded to riboflavin treatment and 24 were nonresponders. The mtDNA haplogroup H was found in 29 subjects (20 migraine without aura, 9 migraine with aura). Riboflavin responders were more numerous in the non-H group (67.5%). Conversely, nonresponders were mostly H (66.7%). The difference between the two groups was significant (chi(2) = 7.07; p = 0.01). The presence of aura had no influence on riboflavin's effectiveness (chi(2) = 0.113; p = 0.74) and was not associated with a particular haplogroup (chi(2) = 0.55; p = 0.46). CONCLUSIONS: In this pharmacogenetic study, riboflavin appears to be more effective in patients with migraine with non-H mitochondrial DNA haplotypes. The underlying mechanisms are unknown, but could be related to the association of haplogroup H with increased activity in complex I, which is a major target for riboflavin. Our results may have ethnic implications, since haplogroup H is chiefly found in the European population. [less ▲]

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See detailNitroglycerin sensitises in healthy subjects CNS structures involved in migraine pathophysiology: evidence from a study of nociceptive blink reflexes and visual evoked potentials.
Di Clemente, Laura; Coppola, Gianluca; Magis, Delphine ULg et al

in Pain (2009), 144(1-2), 156-61

Nitroglycerin (NTG), a NO donor, induces an attack in migraine patients approximately 4-6 h after administration. The causative mechanisms are not known, but the long delay leaves room for a central ... [more ▼]

Nitroglycerin (NTG), a NO donor, induces an attack in migraine patients approximately 4-6 h after administration. The causative mechanisms are not known, but the long delay leaves room for a central effect, such as a change in neuronal excitability and synaptic transmission of various CNS areas involved in pain and behaviour including trigeminal nucleus caudalis and monoaminergic brain stem nuclei. To explore the central action of NTG, we have studied its effects on amplitude and habituation of the nociceptive blink reflex (nBR) and the visual evoked potential (VEP) before, 1 h and 4 h after administration of NTG (1.2 mg sublingual) or placebo (vehicle sublingual) in two groups of 10 healthy volunteers. We found a significant decrease in nBR pain and reflex thresholds both 1 and 4 h post-NTG. At the 4 h time point R2 latency was shorter (p=0.04) and R2 response area increased (p<0.01) after NTG but not after placebo. Habituation tended to become more pronounced after both NTG and placebo administration. There was a significant amplitude increase in the 5th VEP block (p=0.03) at 1h after NTG and in the 1st block (p=0.04) at 4 h. VEP habituation was replaced by potentiation at both delays after NTG; the change in habituation slope was significant at 1h (p=0.02). There were no significant VEP changes in subjects who received sublingual placebo. In conclusion, we found that in healthy subjects sublingual NTG, but not its vehicle, induces changes in a trigeminal nociceptive reflex and an evoked cortical response which are comparable to those found immediately before and during an attack of migraine. These changes could be relevant for the attack-triggering effect of NTG in migraineurs. [less ▲]

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See detailMetabolic correlates of clinical heterogeneity in questionable Alzheimer’s disease
Salmon, Eric ULg; Lekeu, Françoise ULg; Garraux, Gaëtan ULg et al

in Neurobiology of Aging (2008), 29

Thirty-four subjects with questionable Alzheimer's disease (QAD) were included in a 3-year prospective study and underwent neuropsychological testing and measurement of brain metabolism using FDG-PET at ... [more ▼]

Thirty-four subjects with questionable Alzheimer's disease (QAD) were included in a 3-year prospective study and underwent neuropsychological testing and measurement of brain metabolism using FDG-PET at entry. Seventeen patients (50%) did not convert to AD during the follow-up period. Compared to elderly controls of similar age, the cerebral activity of non-converters was reduced in the dorsolateral prefrontal cortex. Moreover, the variability of metabolism in the posterior cingulate cortex was related to their visuospatial memory performance, while disparity in parietal activity was related to their verbal memory performance. These results demonstrate the cerebral metabolic heterogeneity of patients with QAD. Initial functional images of converters showed that activity was already impaired in the posterior cingulate, lateral temporal cortex, anterior cingulate and orbitofrontal cortex. This metabolic pattern is consistent with a pre-dementia stage of AD, and highlights the fact that significant frontal metabolic involvement may be associated with impaired activity in posterior associative cortices in very early AD. [less ▲]

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See detailNeurostimulation in chronic cluster headache.
Magis, Delphine ULg; Schoenen, Jean ULg

in Current Pain and Headache Reports (2008), 12(2), 145-53

About 1% of all chronic cluster headache patients become intractable (iCCH; ie, they are refractory to adequate regimens of all established preventive drugs). Various lesional interventions have been ... [more ▼]

About 1% of all chronic cluster headache patients become intractable (iCCH; ie, they are refractory to adequate regimens of all established preventive drugs). Various lesional interventions have been attempted in these patients, none with lasting benefits. In recent years, nondestructive neurostimulation methods have raised new hope. Hypothalamic deep brain stimulation (hDBS) acts rather rapidly and has durable efficacy, but it is not without risk. Occipital nerve stimulation (ONS) was studied in two trials that included 17 iCCH patients. Clinical efficacy was found to be very satisfactory by most patients and investigators. Although slightly less efficacious than hDBS, ONS has the advantage of being harmless and reversible. At this stage, it should be the preferred first-line invasive therapy for iCCH. Recent case reports mention efficacy of supraorbital and vagus nerve stimulation. Whether these neurostimulation methods have a place in the management of iCCH patients remains to be determined. [less ▲]

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See detailInterictal abnormalities of gamma band activity in visual evoked responses in migraine: an indication of thalamocortical dysrhythmia?
Coppola, G.; Ambrosini, Anna; Di Clemente, L. et al

in Cephalalgia : An International Journal of Headache (2007), 27(12), 1360-1367

Between attacks, migraineurs lack habituation in standard visual evoked potentials (VEPs). Visual stimuli also evoke high-frequency oscillations in the gamma band range (GBOs, 20-35 Hz) assumed to be ... [more ▼]

Between attacks, migraineurs lack habituation in standard visual evoked potentials (VEPs). Visual stimuli also evoke high-frequency oscillations in the gamma band range (GBOs, 20-35 Hz) assumed to be generated both at subcortical (early GBOs) and cortical levels (late GBOs). The consecutive peaks of GBOs were analysed regarding amplitude and habituation in six successive blocks of 100 averaged pattern reversal (PR)-VEPs in healthy volunteers and interictally in migraine with (MA) or without aura patients. Amplitude of the two early GBO components in the first PR-VEP block was significantly increased in MA patients. There was a significant habituation deficit of the late GBO peaks in migraineurs. The increased amplitude of early GBOs could be related to the increased interictal visual discomfort reported by patients. We hypothesize that the hypofunctioning serotonergic pathways may cause, in line with the thalamocortical dysrhythmia theory, a functional disconnection of the thalamus leading to decreased intracortical lateral inhibition, which can induce dishabituation. [less ▲]

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See detailEvaluation and proposal for optimization of neurophysiological tests in migraine: Part 2 - neuroimaging and the nitroglycerin test
Magis, Delphine ULg; Bendtsen, L.; Goadsby, P. J. et al

in Cephalalgia : An International Journal of Headache (2007), 27(12), 1339-1359

Neuroimaging methods have been widely used in headache and migraine research. They have provided invaluable information on brain perfusion, metabolism and structure during and outside of migraine attacks ... [more ▼]

Neuroimaging methods have been widely used in headache and migraine research. They have provided invaluable information on brain perfusion, metabolism and structure during and outside of migraine attacks, contributing to an improved understanding of the pathophysiology of the disorder. Human models of migraine attacks are indispensable tools in pathophysiological and therapeutic research. This review of neuroimaging methods and the attack-provoking nitroglycerin test is part an initiative by a task force within the EUROHEAD project (EU Strep LSHM-CT-2004-5044837-Workpackage 9) with the objective of critically evaluating neurophysiological tests used in migraine. The first part, presented in a companion paper, is devoted to electrophysiological methods, this second part to neuroimaging methods such as functional magnetic resonance imaging, positron emission tomography and voxel-based morphometry, as well as the nitroglycerin test. For each of these methods, we summarize the results, analyse the methodological limitations and propose recommendations for improved methodology and standardization of research protocols. [less ▲]

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See detailEvaluation and proposal for optimalization of neurophysiological tests in migraine: Part 1 - electrophysiological tests
Magis, Delphine ULg; Ambrosini, Anna; Bendtsen, L. et al

in Cephalalgia : An International Journal of Headache (2007), 27(12), 1323-1338

Neurophysiological testing has become a valuable tool for investigating brain excitability and nociceptive systems in headache disorders. Previous reviews have suggested that most neurophysiological tests ... [more ▼]

Neurophysiological testing has become a valuable tool for investigating brain excitability and nociceptive systems in headache disorders. Previous reviews have suggested that most neurophysiological tests have limited value for headache diagnosis, but a vast potential for exploring the pathophysiology of headaches, the central effects of certain pharmacological treatments and phenotype-genotype correlations. Many protocols, however, lack standardization. This meta-analytical review of neurophysiological methods in migraine was initiated by a task force within the EUROHEAD project (EU Strep LSHM-CT-2004-5044837-Workpackage 9). Most of the neurophysiological approaches that have been used in headache patients are reviewed, i.e. evoked potentials, nociception-specific blink reflex, single-fibre electromyography, neuroimaging methods (functional MRI, PET, and voxel-based morphometry) and the nitroglycerin attack-provoking test. For each of them, we summarize the results, analyse the methodological limitations and propose recommendations for improved methodology and standardization of research protocols. The first part is devoted to electrophysiological methods, the second to neuroimaging techniques and the NTG test. [less ▲]

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See detailThe vestibulo-collic reflex is abnormal in migraine
Allena, M.; Magis, Delphine ULg; De Pasqua, Victor ULg et al

in Cephalalgia : An International Journal of Headache (2007), 27(10), 1150-1155

Interictal evoked central nervous system responses are characterized in migraineurs by a deficit of habituation, at both cortical and subcortical levels. The click-evoked vestibulo-collic reflex (VCR ... [more ▼]

Interictal evoked central nervous system responses are characterized in migraineurs by a deficit of habituation, at both cortical and subcortical levels. The click-evoked vestibulo-collic reflex (VCR) allows the assessment of otolith function and an oligosynaptic pathway linking receptors in the saccular macula to motoneurons of neck muscles. Three blocks of 75 averaged responses to monaural 95-dB normal hearing level 3-Hz clicks were recorded over the contracted ipsilateral sternocleidomastoid muscle in 25 migraineurs between attacks and 20 healthy subjects, without vestibular symptoms. Amplitudes, raw and corrected for baseline electromyography, were significantly smaller in migraine patients. Whereas in healthy volunteers the VCR habituated during stimulus repetition (-4.96% +/- 14.3), potentiation was found in migraineurs (4.34% +/- 15.3; P = 0.04). The combination with a reduced mean amplitude does not favour vestibular hyperexcitability as an explanation for the habituation deficit in migraine, but rather an abnormal processing of repeated stimuli in the reflex circuit. [less ▲]

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See detailSearch for correlations between genotypes and electrophysiological patterns in migraine: the MTHFR C677T polymorphism and visual evoked potentials
Magis, Delphine ULg; Allena, M.; Coppola, G. et al

in Cephalalgia : An International Journal of Headache (2007), 27(10), 1142-1149

Interictally, migraineurs have on average a reduction in habituation of pattern-reversal visual evoked potentials (PR-VEP) and in mitochondrial energy reserve. 5,10-Methylenetetrahydrofolate reductase ... [more ▼]

Interictally, migraineurs have on average a reduction in habituation of pattern-reversal visual evoked potentials (PR-VEP) and in mitochondrial energy reserve. 5,10-Methylenetetrahydrofolate reductase (MTHFR) is involved in folate metabolism and its C677T polymorphism may be more prevalent in migraine. The aim of this study was to search in migraineurs for a correlation between the MTHFR C677T polymorphism and the PR-VEP profile. PR-VEP were recorded in 52 genotyped migraine patients: 40 female, 24 without (MoA), 28 with aura (MA). Among them 21 had a normal genotype (CC), 18 were heterozygous (CT) and 13 homozygous (TT) for the MTHFR C677T polymorphism. Mean PR-VEP N1-P1 amplitude was significantly lower in CT compared with CC, and tended to be lower in TT with increasing age. The habituation deficit was significantly greater in CC compared with TT subjects. The correlation between the cortical preactivation level, as reflected by the VEP amplitude in the first block of averages, and habituation was stronger in CC than in CT or TT. The MTHFR C677T polymorphism could thus have an ambiguous role in migraine. On one hand, the better VEP habituation which is associated with its homozygosity, and possibly mediated by homocysteine derivatives increasing serotoninergic transmission, may protect the brain against overstimulation. On the other hand, MTHFR C677T homozygosity is linked to a reduction of grand average VEP amplitude with illness duration, which has been attributed to brain damage. [less ▲]

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See detailConditioning by high frequency visual stimuli of the visual evoked potential in healthy volunteers and migraineurs
Bolla, M.; Magis, Delphine ULg; Gerardy, P. et al

Poster (2007, August)

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See detailInhibition of the nociceptive R2 blink reflex after supraorbital or index finger stimulation is normal in migraine without aura between attacks
Coppola, G.; Di Clemente, L.; Fumal, Arnaud ULg et al

in Cephalalgia : An International Journal of Headache (2007), 27(7), 803-808

Coppola G, Di Clemente L, Fumal A, Magis D, De Pasqua V, Pierelli F & Schoenen J. Inhibition of the nociceptive R2 blink reflex after supraorbital or index finger stimulation is normal in migraine without ... [more ▼]

Coppola G, Di Clemente L, Fumal A, Magis D, De Pasqua V, Pierelli F & Schoenen J. Inhibition of the nociceptive R2 blink reflex after supraorbital or index finger stimulation is normal in migraine without aura between attacks. Cephalalgia 2007; 27:803-808. London. ISSN 0333-1024 In order to explore possible interictal brainstem dysfunctions in migraine, we have studied the R2 component of the nociceptive specific blink reflex (nBR) after conditioning by supraorbital or index finger stimuli in 14 untreated migraine without aura patients (MO) between attacks and in 15 healthy volunteers. We determined the R2 recovery curve at increasing inter-stimulus intervals between 50 and 600 ms. The nBR was conditioned by a paired supraorbital stimulus and, in another session, by an ipsilateral electrical shock delivered to the index finger. The R2 nBR recovery curves were normal in MO patients for both the supraorbital and peripheral conditioning. These results do not favour persistent interictal sensitization in the spinal trigeminal sensory system. They also suggest that the control exerted by descending brainstem pathways on medullary R2 interneurones is normal in migraine between attacks. [less ▲]

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See detailSearch for correlations between the therapeutic response to riboavin and migraine mitochondrial abnormalities
Coppola, Gianluca; Di Lorenzo, Cherubino; Magis, Delphine ULg et al

in Cephalalgia : An International Journal of Headache (2007, June), 27(6), 590

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See detailPrevalence of patent foramen ovale and MRI white matter lesions in migraine with aura
Schoenen, Jean ULg; Magis, Delphine ULg; Fumal, Arnaud ULg et al

in Cephalalgia : An International Journal of Headache (2007, June), 27(6), 577-578

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See detailTranscutaneous temporal electrotherapy in chronic migraine: a pilot study of short term efficacy and mode of action
Bolla, M.; De Pasqua, Victor ULg; Gérardy, Pierre-Yves ULg et al

in Cephalalgia : An International Journal of Headache (2007, June), 27(6), 743-744

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See detailInterictal cognition in migraineurs: a study correlating psychometric and neurophysiological tests
Magis, Delphine ULg; Coppola, G.; Di Clemente, L. et al

in Cephalalgia : An International Journal of Headache (2007, June), 27(6), 714

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