Order 1106099: migraine

Running Head: VISUALLY EVOKED FIELDS IN MIGRAINE PATIENTS 1

VISUALLY EVOKED FIELDS IN MIGRANE PATIENTS 6

Visually Evoked Fields in Migraine patients

Name

Institutional Affiliation Abstract

Objective :The main objective of this study is to investigate the functional abnormalities of Visually Evoked Fields (VEF) in female Migraine patients with magnetoencephalography (MEG)

Methods: A sample of 21 patients and sample of 11 healthy individuals were studied in an MEG system. The Neuromagnetic activation was achieved through a checkerboard reversal pattern.

Results: The The latency of visual -evoked magnetic fields evoked of female migraine patients is significantly prolonged in comparison to their counterparts controls . Neuromagnetic spectral power in the visual cortex in migraineurs was significantly elevated. There were significantly higher odds of activation in 5–30,100-200 Hz frequency ranges in the ipsilateral visual cortices in migraineurs as compared with controls.

Conclusions: Neuromagnetic signal abnormalities in this study suggest visual cortical hyperexcitability in females with migraine attack. These abnormality can be measured in5-30HZ, and 100-200Hz using MEG signals

Significance:The significance of this study is that it contributes towards an understanding of the mechanism of migraine and may facilitate development of new therapies assist the patients.

Visually Evoked Fields in Migraine patients

Introduction

Migraine is a considered as cerebral information processing disorder that is attributed with central hypersensitivity that is partially inherited. Deficiency in habituation ability in people who have migraine, which is evidence by a decrement in amplitude over time, accounts for increased in amplitude in the previous VEF cases(Charles 2012; Copolla & Schoenen 2012). Patients who suffer from Migraine often have symptoms such as high sensitivity to visual and auditory sensors, and a high sensory stimulus on a migraine attack. Occasionally, Migraine starts at childhood, with a high prevalence during the adolescent stage and deteriorates on adulthood(Gelfland , Fullerton , & Goadsby 2010). During the adolescence period, the prevalence of Migraine is on the same level both boys and girls. However, after puberty, the rates increase higher for girls relative to that of boys(Gladstein & Rothner 2010; Hershey & Kabouche 2010). Previous researches have delineated the excitability change of the visual cortex in migraine.(W-T Chen1 et al., 2009) This research paper focuses on evaluation of Visually Evoked Fields in female Migraine patients and some of the causes and effects.

Literature review

The key neurobiological causes of Migraine are a subject of research. However, there is sufficient evidence that celebral cortex is a significant factor that contributes to migraine attack(Aurora , AL-Sayeed , & Welch 2002; Behotin et al., 2002; Buse et al., 2012). Bowyer and his research partners found that patients who had migraine exhibited a hyperexcitability in their cortical cells(Bowyer , Mason , Moran , Teplyey, & Wechi, 2005; Brigo et al., 2012). Recent researchers did a study Magnetoencephalography studies in children diagnosed with migraine and concludedthat during the migraine attacks, there was evidence of neuromagneticactivation that has a low frequency range(Lang, Kaltenhauser, Neundorder , & Seidler, 2004). There was a notable increase in the spectral capability in the presence of high frequency ranges(Xiang , Wilson , & Ishi 2001; Xiang , Wilson , Otsubo , Ishii, & Chuang 2010).

Movements are the key source of trigger of the brain activation and it plays an integral role towards the eradication of pediatric migraine attacks(Xiang et al., 2013; Young , Gangal , Aponte , & Kaiser 2007). Other researchers revealed that age is a significant factor that determines the severity of the pain, frequency and other forms of disability that arise from Migraine(Behotin et al., 2002). Recent studies reveal that motor cortex in the subject of migraine is an important factor of consideration(Conforto et al., 2012). There is sufficient evidence that the movement worsens the condition of the migraine and a particular set of patients revealed the presence of Hemiplegia(Esposito et al., 2012; Fumal , Bohotin , Vandenheede , & Schoenen 2003). Additionally, recent reports give evidence of a weird type of migraine which has unilateral motor symptoms is evident and gives rise to a type an uncommon body weakness(Chen, Lin , Ko, & Wang 2011; Gunaydin , SoySal , Atay, & Arpaci, 2006)

Methodology

The subjects of the research entailed 30 female patients who were diagnosed with acute migraine. The average age of the patients was 35 years with a standard deviation of 5.6 years and an age range of 16-45. Only eight of the patients had migraine aura while the rest did not have. All the patients signed a permission form for age >18 while for age <18 their custodian were mandated the role of signing the consent forms. The study with the inclusion of the consent forms were signed and approved by the Maryland brain hospital before the study was conducted, which entailed the migraine patients with or without acute migraine and secondly patients with no other neurotic disorder. Some of the control measures were (1) no record of neurological disorder or an injury in the brain, appropriate sensory of hand coordination and hearing in accordance to age. Some of the patients were excluded on the criteria of presence of an implant which has the potential to produce a visible magnetic field or noise, or evidence of a noticeable fear and excitement where the patient was unable to communicate effectively with the personnel operating the MEG operator. Likewise, other exclusion criteria were the inability to remain calm and subjects with claustrophobic tendencies or pregnancies.

Test

All the respondents performed an brisk tap using their index fingers of both the left and the right ear as their concurrently listened to a cu. As the index finger remained ipsilateral to the tone that was presented, the patients gently pressed their response button. This was performed as the eyes remained open. After pressing the response box, a concurrent signal was sent to the MEG. There was a random presentation of stimuli that consisted of 200 and 100 trials through the plastic tubes and earphones. The presentation of the stimulation and response record were achieved through integration of Brain X software. Each procedure used an average of 15 minutes.

MEG Recording

A control magnetic room was shielded with the integration of a whole head channel of 275 CFT where the MEG signals were recorded. Likewise all the patients were requested to remove any magnetic materials from their bodies. At both the left and right Preauricular points, there was an attachment of electromagnetic coils. Different frequencies were used to activate the three coils in order to measure the patients head position in comparison to the censors of MEG. In the entire procedure, the patients were requested to lie in their position of comfort with both of the arms resting on all sides. MEG recorded the responses at 6000Hz per channel. Acquisition window was set at 3000ms in each trial, where 2000ms in each trigger was recorded in the MEG system after pressing the response button. The physicist monitored the head position, where they rejected any procedure where the head movement was higher than 5mm. In such a case, an additional trial was included. Anatomical images were obtained for all patients using 1.5 MRI. Fiducial markers were placed on the location identical to the recordings from the MEG Imaging data was significantly observed from the magnetic resonance to ensure the three MEG landmarks were co-registered.

Data analysis

Morphology

MEG data was analyzed manually where they were processed by a removal of Direct Current9DC) basing the results on a pre-trigger baseline. Movement Evoked Fields (MEF) were observed and obtained. Afterwards, the MEG data was analyzed by applying a low pass and high pass filter. Some of the attributes of the magnetic fields that were automatically measured entailed the latencies and peak amplitudes by putting the cursor on each of the component.

Analysis of Time Frequency

Data from the MEG time domain were transformed to spectrograms using the Morlet continuous wavelet transform. There an average of all trials where they were presented as accumulated Spectrograms. Afterwards the root mean square was used to compute the spectral power. Sources of the finger tapped magnetic signals were estimated using the Wavelet Based Beam former.

Statistical analysis

T test of two samples was enacted in the latencies and the amplitudes of the movements of the Magnetically Evoked Fields (MEF) of the migraine patients and the Chi square tests were used to analyze locations of the brain activation points generated by finger tapping between migraine and control. It was done at a statistical significance of p<0.5.

Results

· Spatial characteristics in the contours reveal evidence of magnetic fields

· Absolute wavelength quantified the magnetic energy of the evidenced fields

· All the waveforms had a quantifiable frequency which was different from the healthy patients

· The level of activation was different in the migraine patients in comparison to the healthy patients

One of the most significant findings of this paper is that the female patients exhibited a high probability of Neuromagnetic activation in the supplementary motor area and ipsilateral sensorimotor Cortices. It gives evidence of an abnormal increase of ictal brain activation that is prompted by movements. Migraine is correlated to cortical hyperactive excitability; spread of the ictal brain activation because of movements plays an integral role in the cascade of the attacks(Rapoport 2011; Scherer , Bauer , & Baum 1997).

The MEG results prove that migraine is associated with an existence of Magnetic fields that are motor evoked. Migraine also amounts to an increased prevalence of neuromagneteic activation(Hershey 2012). However, one subject that remains a mystery is the relationship between the prolonged Magnetic fields amounts to increased activation of the neuromagnetic fields. Possible assumption is that there is no significant relationship between the two(Hershey 2010). However, a delay in Motor evoked responses is highly attributed to white impairments in Migraine patients(Aurora , Al-Sayeed , & Welch 1999; Charles 2009; Rocca , Colombo , Pagani , Falini, & Scotti 2003).

Discussions

This study explored the neuromagnetic fields in migraine feminine patients throughout the period of headaches through the measurement of waveforms, spectrograms and other localized programs. Analysis of the waveform was based on an average of MEG data. The results have provided sufficient evidence that female patients had a typical dysfunction of the motor cortical cells, migraine as shown in the MEG data on waveforms and spectrograms. There was no difference in the results of the MEG data between the migraine patients with Aura and without Aura. Spectral data and waveforms in the MEG data revealed that there was slow movement of the latency of elicit brain activation in the female patients who had migraine than the control patients. Such finding supports the propositions that migraine is a typical disorder in the neurology other than being a vascular disorder(Bowyer , Aurora , Boran , Tepley , & Welch 2001; Brighina , Palamo , Danielle , Aloisio , & Fierro, 2010). In addition to this, the patients who had migraine had a stronger motor cortical activation in comparison to the control patients. This has a high correlation to the previous MEG results from other studies. Cortical Hyperactive excitability is highly attributed to increased brain activation 31

Conclusion

This study has proven sufficiently and effectively that the patients with migraine experienced a delay in motor cortical activation and an increased possibility of neuromagnetic field. It happens in the complementary motor area and ipsilateral sensorimotor cortices. It supports the perception that Migraine is highly correlated to Cortical Hyperexcitability because of the significant increase in the cortical activation because of the movements. Such spread of ictal brain activation plays an integral role towards eradication of migraine attacks. In the future, these types of findings have the potential of development of a treatment to treat morbidity and mortality cases attributed to Migraine.

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