JoVE Visualize What is visualize?
Stop Reading. Start Watching.
Advanced Search
Stop Reading. Start Watching.
Regular Search
Find video protocols related to scientific articles indexed in Pubmed.
Concordance of genetic risk across migraine subgroups: Impact on current and future genetic association studies.
Cephalalgia
PUBLISHED: 09-01-2014
Show Abstract
Hide Abstract
There has been intensive debate whether migraine with aura (MA) and migraine without aura (MO) should be considered distinct subtypes or part of the same disease spectrum. There is also discussion to what extent migraine cases collected in specialised headache clinics differ from cases from population cohorts, and how female cases differ from male cases with respect to their migraine. To assess the genetic overlap between these migraine subgroups, we examined genome-wide association (GWA) results from analysis of 23,285 migraine cases and 95,425 population-matched controls.
Related JoVE Video
Public and private health service in Norway: a comparison of patient characteristics and surgery criteria for patients with nerve root affections due to discus herniation.
Eur Spine J
PUBLISHED: 03-28-2014
Show Abstract
Hide Abstract
To compare sociodemographic, life style and clinical characteristics in patients operated for lumbar disc herniation in public and private clinics in Norway, and evaluate whether selection for surgery and surgical treatment were different across the two settings.
Related JoVE Video
Anxiety, depression and behavioral problems among adolescents with recurrent headache: the Young-HUNT study.
J Headache Pain
PUBLISHED: 03-15-2014
Show Abstract
Hide Abstract
It is well documented that both anxiety and depression are associated with headache, but there is limited knowledge regarding the relation between recurrent primary headaches and symptoms of anxiety and depression as well as behavioral problems among adolescents. Assessment of co-morbid disorders is important in order to improve the management of adolescents with recurrent headaches. Thus the main purpose of the present study was to assess the relationship of recurrent headache with anxiety and depressive symptoms and behavioral problems in a large population based cross-sectional survey among adolescents in Norway.
Related JoVE Video
Recurrent headache and interpersonal violence in adolescence: the roles of psychological distress, loneliness and family cohesion: the HUNT study.
J Headache Pain
PUBLISHED: 03-07-2014
Show Abstract
Hide Abstract
Recurrent headache is the most common and disabling pain condition in adolescence. Co-occurrence of psychosocial adversity is associated with increased risk of chronification and functional impairment. Exposure to interpersonal violence seems to constitute an important etiological factor. Thus, knowledge of the multiple pathways linking interpersonal violence to recurrent headache could help guide preventive and clinical interventions. In the present study we explored a hypothetical causal model where the link between exposure to interpersonal violence and recurrent headache is mediated in parallel through loneliness and psychological distress. Higher level of family cohesion and male sex is hypothesized to buffer the adverse effect of exposure to interpersonal violence on headache.
Related JoVE Video
The relationship between headache and religious attendance (the Nord-Trøndelag health study- HUNT).
J Headache Pain
PUBLISHED: 01-03-2014
Show Abstract
Hide Abstract
Religious belief can be used as a pain coping strategy. Our purpose was to evaluate the relationship between headache and religious activity using prospective data from a large population-based study.
Related JoVE Video
Do abnormal serum lipid levels increase the risk of chronic low back pain? The Nord-Trøndelag Health Study.
PLoS ONE
PUBLISHED: 01-01-2014
Show Abstract
Hide Abstract
Cross-sectional studies suggest associations between abnormal lipid levels and prevalence of low back pain (LBP), but it is not known if there is any causal relationship.
Related JoVE Video
Headache as a risk factor for dementia: A prospective population-based study.
Cephalalgia
PUBLISHED: 11-21-2013
Show Abstract
Hide Abstract
Headache has not been established as a risk factor for dementia. The aim of this study was to determine whether any headache was associated with subsequent development of vascular dementia (VaD), Alzheimers disease (AD) or other types of dementia.
Related JoVE Video
Urinary albumin excretion as a marker of endothelial dysfunction in migraine sufferers: the HUNT study, Norway.
BMJ Open
PUBLISHED: 08-15-2013
Show Abstract
Hide Abstract
To investigate urine albumin leakage as a marker of endothelial dysfunction in migraine patients.
Related JoVE Video
Potentially traumatic interpersonal events, psychological distress and recurrent headache in a population-based cohort of adolescents: the HUNT study.
BMJ Open
PUBLISHED: 08-01-2013
Show Abstract
Hide Abstract
Recurrent headache co-occurs commonly with psychological distress, such as anxiety or depression. Potentially traumatic interpersonal events (PTIEs) could represent important precursors of psychological distress and recurrent headache in adolescents. Our objective was to assess the hypothesised association between exposure to PTIEs and recurrent migraine and tension-type headache (TTH) in adolescents, and to further examine the potential impact of psychological distress on this relationship.
Related JoVE Video
Related JoVE Video
Magnetic resonance imaging evaluation after implantation of a titanium cervical disc prosthesis: a comparison of 1.5 and 3 Tesla magnet strength.
Eur Spine J
PUBLISHED: 06-05-2013
Show Abstract
Hide Abstract
Cervical disc prostheses induce significant amount of artifact in magnetic resonance imaging which may complicate radiologic follow-up after surgery. The purpose of this study was to investigate as to what extent the artifact, induced by the frequently used Discover(®) cervical disc prosthesis, impedes interpretation of the MR images at operated and adjacent levels in 1.5 and 3 Tesla MR.
Related JoVE Video
Genome-wide meta-analysis identifies new susceptibility loci for migraine.
Verneri Anttila, Bendik S Winsvold, Padhraig Gormley, Tobias Kurth, Francesco Bettella, George McMahon, Mikko Kallela, Rainer Malik, Boukje de Vries, Gisela Terwindt, Sarah E Medland, Unda Todt, Wendy L McArdle, Lydia Quaye, Markku Koiranen, M Arfan Ikram, Terho Lehtimäki, Anine H Stam, Lannie Ligthart, Juho Wedenoja, Ian Dunham, Benjamin M Neale, Priit Palta, Eija Hämäläinen, Markus Schürks, Lynda M Rose, Julie E Buring, Paul M Ridker, Stacy Steinberg, Hreinn Stefansson, Finnbogi Jakobsson, Debbie A Lawlor, David M Evans, Susan M Ring, Markus Färkkilä, Ville Artto, Mari A Kaunisto, Tobias Freilinger, Jean Schoenen, Rune R Frants, Nadine Pelzer, Claudia M Weller, Ronald Zielman, Andrew C Heath, Pamela A F Madden, Grant W Montgomery, Nicholas G Martin, Guntram Borck, Hartmut Göbel, Axel Heinze, Katja Heinze-Kuhn, Frances M K Williams, Anna-Liisa Hartikainen, Anneli Pouta, Joyce van den Ende, André G Uitterlinden, Albert Hofman, Najaf Amin, Jouke-Jan Hottenga, Jacqueline M Vink, Kauko Heikkilä, Michael Alexander, Bertram Müller-Myhsok, Stefan Schreiber, Thomas Meitinger, Heinz Erich Wichmann, Arpo Aromaa, Johan G Eriksson, Bryan J Traynor, Daniah Trabzuni, Elizabeth Rossin, Kasper Lage, Suzanne B R Jacobs, J Raphael Gibbs, Ewan Birney, Jaakko Kaprio, Brenda W Penninx, Dorret I Boomsma, Cornelia van Duijn, Olli Raitakari, Marjo-Riitta Järvelin, John-Anker Zwart, Lynn Cherkas, David P Strachan, Christian Kubisch, Michel D Ferrari, Arn M J M van den Maagdenberg, Martin Dichgans, Maija Wessman, George Davey Smith, Kari Stefansson, Mark J Daly, Dale R Nyholt, Daniel I Chasman, Aarno Palotie, .
Nat. Genet.
PUBLISHED: 05-30-2013
Show Abstract
Hide Abstract
Migraine is the most common brain disorder, affecting approximately 14% of the adult population, but its molecular mechanisms are poorly understood. We report the results of a meta-analysis across 29 genome-wide association studies, including a total of 23,285 individuals with migraine (cases) and 95,425 population-matched controls. We identified 12 loci associated with migraine susceptibility (P<5×10(-8)). Five loci are new: near AJAP1 at 1p36, near TSPAN2 at 1p13, within FHL5 at 6q16, within C7orf10 at 7p14 and near MMP16 at 8q21. Three of these loci were identified in disease subgroup analyses. Brain tissue expression quantitative trait locus analysis suggests potential functional candidate genes at four loci: APOA1BP, TBC1D7, FUT9, STAT6 and ATP5B.
Related JoVE Video
Randomised trial on episodic cluster headache with an angiotensin II receptor blocker.
Cephalalgia
PUBLISHED: 04-18-2013
Show Abstract
Hide Abstract
The aim of this study was to evaluate the angiotensin II receptor antagonist candesartan as prophylactic medication in patients with episodic cluster headache.
Related JoVE Video
Migraine, headache and development of metabolic syndrome: an 11-year follow-up in the Nord-Trøndelag Health Study (HUNT).
Pain
PUBLISHED: 03-11-2013
Show Abstract
Hide Abstract
Migraine with aura is associated with an increased incidence of stroke and cardiovascular disease, but the biological mechanisms are poorly understood. This study examined the incidence of metabolic syndrome and its relationship to migraine with and without aura and to nonmigraine headache. In the population-based the Nord-Trøndelag Health Study (HUNT), 19,895 individuals were followed for the development of metabolic syndrome, with a median follow-up time of 11.3 years. Headache diagnoses were based on a validated headache questionnaire, and metabolic syndrome was based on a modified version of the National Cholesterol Education Programs Adult Treatment Panel (ATP) III criteria, using objective anthropometric measurements and blood biochemistry. Using the Poisson regression model, migraine with aura was associated with an increased risk for developing metabolic syndrome. The effect was modified by smoking, with an adjusted incident risk ratio (IRR) among smokers of 2.10 (95% CI 1.53-2.89) and among nonsmokers of 1.39 (95% CI 1.03-1.86), when compared to headache-free controls. A moderate risk increase was seen for migraine without aura (IRR 1.26, 95% CI 1.12-1.42) and nonmigraine headache (IRR 1.22, 95% CI 1.13-1.32), not modified by smoking. The results suggest that traditional risk factors may be one of the mechanisms through which migraine with aura is linked to an increased risk for cardiovascular disease. A heightened vigilance concerning cardiovascular risk factors in this patient group may be warranted.
Related JoVE Video
Smoking as a risk factor for chronic musculoskeletal complaints is influenced by age. The HUNT study.
Pain
PUBLISHED: 02-01-2013
Show Abstract
Hide Abstract
Chronic musculoskeletal complaints (MSCs) are among the major health problems, and cross-sectional studies suggest an association between smoking and MSCs. The causal relationship, however, is not known. The present study is designed to assess the association between smoking and chronic MSCs, and is based on data from a large longitudinal cohort study of all inhabitants ?20years in Nord-Trøndelag County (Helse Undersøkelsen i Nord-Trøndelag -HUNT), conducted in 1995-97 (HUNT 2) and 2006-08 (HUNT 3). The study population consisted of 15,134 subjects without chronic MSCs and valid exposure data on smoking at baseline (HUNT 2). The outcome was defined as presence of chronic MSCs at follow-up (HUNT 3). The results show that smoking at baseline represents a 20% increased risk (IRR=1.20, 95% CI 1.14-1.27, P=0.0001) for chronic MSCs at follow-up. The risk for chronic MSCs by daily smoking decreased with increasing age up to 50years; after this, there was no significant association. The results show that modifiable risk factors like smoking should be included in public health intervention programs for MSCs.
Related JoVE Video
The impact of headache and chronic musculoskeletal complaints on the risk of insomnia: longitudinal data from the Nord-Trøndelag health study.
J Headache Pain
PUBLISHED: 01-04-2013
Show Abstract
Hide Abstract
A strong relationship between insomnia and painful disorders has been found, but it is still unclear whether chronic pain leads to insomnia. There is a need of large-scale prospective studies to evaluate if there is a causal relationship between painful disorders and insomnia.
Related JoVE Video
Increasing prevalence of chronic musculoskeletal complaints. A large 11-year follow-up in the general population (HUNT 2 and 3).
Pain Med
PUBLISHED: 09-21-2011
Show Abstract
Hide Abstract
To assess the prevalence of chronic musculoskeletal complaints (MSCs) in a large adult population, and to determine any changes in prevalence during an 11-year period.
Related JoVE Video
Headache and musculoskeletal complaints among subjects with self reported whiplash injury: the HUNT-2 study.
BMC Musculoskelet Disord
PUBLISHED: 06-08-2011
Show Abstract
Hide Abstract
To evaluate the life-time prevalence of self reported whiplash injury and the relationship to chronic musculoskeletal complaints (MSCs) and headache in a large unselected adult population.
Related JoVE Video
Risk factors for medication-overuse headache: an 11-year follow-up study. The Nord-Trøndelag Health Studies.
Pain
PUBLISHED: 05-30-2011
Show Abstract
Hide Abstract
Medication-overuse headache (MOH) is relatively common, but its incidence has not been calculated and there are no prospective population-based studies that have evaluated risk factors for developing MOH. The aim of this study was to estimate incidences of and identify risk factors for developing chronic daily headache (CDH) and MOH. This longitudinal population-based cohort study used data from the Nord-Trøndelag Health Surveys performed in 1995-1997 and 2006-2008. Among the 51,383 participants at baseline, 41,766 were eligible approximately 11 years later. There were 26,197 participants (responder rate 63%), among whom 25,596 did not report CDH at baseline in 1995-1997. Of these, 201 (0.8%) had MOH and 246 (1.0%) had CDH without medication overuse (CDHwoO) 11 years later. The incidence of MOH was 0.72 per 1000 person-years (95% confidence interval 0.62-0.81). In the multivariate analyses, a 5-fold risk for developing MOH was found among individuals who at baseline reported regular use of tranquilizers [odds ratio 5.2 (3.0-9.0)] or who had a combination of chronic musculoskeletal complaints, gastrointestinal complaints, and Hospital Anxiety and Depression Scale score ? 11 [odds ratio 4.7 (2.4-9.0)]. Smoking and physical inactivity more than doubled the risk of MOH. In contrast, these factors did not increase the risk of CDHwoO. In this large population-based 11-year follow-up study, several risk factors for MOH did not increase the risk for CDHwoO, suggesting these are pathogenetically distinct. If the noted associations are causal, more focus on comorbid condition, physical activity, and use of tobacco and tranquilizers may limit the development of MOH.
Related JoVE Video
The long-term effect of insomnia on primary headaches: a prospective population-based cohort study (HUNT-2 and HUNT-3).
Headache
PUBLISHED: 04-05-2011
Show Abstract
Hide Abstract
Few prospective studies have evaluated the relationship between insomnia and headache. We aimed to analyze the influence of insomnia at baseline on the risk for headache 11 years later.
Related JoVE Video
Chronic idiopathic pain in adolescence--high prevalence and disability: the young HUNT Study 2008.
Pain
PUBLISHED: 02-18-2011
Show Abstract
Hide Abstract
The aim of this study was to determine the prevalence of self-reported chronic idiopathic pain among adolescents in relation to age and gender, and to explore how pain interferes with daily activities. The study was performed in Nord-Trøndelag County, Norway in 2006-2008. All adolescents were invited to participate; the response rate was 78%. Participants completed a comprehensive questionnaire, including questions about pain and interference with everyday life. Chronic idiopathic pain was defined as pain at least once a week during the last 3 months, not related to any known disease or injury. The final study population, with complete pain questionnaires, consisted of 7373 adolescents aged 13-18 years. Chronic pain was reported by 44.4% of the participants, and 25.5% reported pain in at least 2 locations. Chronic idiopathic musculoskeletal pain was most prevalent (33.4%), and the neck/shoulder was most commonly affected. Musculoskeletal pain in 3 or more locations was reported by 8.5%. Pain almost daily was reported by 10.2%. More girls than boys reported pain. In girls, the prevalence of pain increased with age. A high number of pain-associated disabilities were reported, and 58.5% described difficulties doing daily activities in leisure time. Subjective disabilities were higher in girls, and increased with the frequency of pain and the number of pain locations, as shown by high disability in adolescents with musculoskeletal pain in 3 or more locations. Chronic idiopathic pain, especially multisite pain, is common among adolescents, and those suffering from it report a major impact on several areas of daily living.
Related JoVE Video
Association between blood pressure measures and recurrent headache in adolescents: cross-sectional data from the HUNT-Youth study.
J Headache Pain
PUBLISHED: 01-22-2011
Show Abstract
Hide Abstract
The relationship between blood pressure and headache in youth has not been explored and the objective of the present study was to provide data on this association in an adolescent population. Cross-sectional data from a large population-based survey, the Young-HUNT study, on 5,847 adolescents were used to evaluate the association between blood pressure (systolic, diastolic, mean arterial and pulse pressure) and recurrent headache, including migraine and tension-type headache. Increasing pulse pressure was inversely related to recurrent headache prevalence, and both tension-type headache and migraine. For systolic blood pressure such an inverse relationship was present for recurrent headache and tension-type headache prevalence. For migraine, the results were not significant, although there was a tendency in the same direction (p = 0.05). High-pulse pressure has previously been found to be inversely related to the prevalence of migraine and tension-type headache in an adult population. This inverse relationship has now been demonstrated to be present among adolescents also, supporting the results from a previous study in adults, that blood pressure regulation may be linked to the pathophysiology of headache.
Related JoVE Video
A 4-year follow-up of patients with medication-overuse headache previously included in a randomized multicentre study.
J Headache Pain
PUBLISHED: 01-05-2011
Show Abstract
Hide Abstract
The aim of this study was to evaluate the long-term outcome in 61 patients with medication-overuse headache (MOH) who 4 years previously had been included in a randomized open-label prospective multicentre study. Sixty patients still alive after 4 years were invited to a follow-up investigation. Fifty patients (83%) participated. Sixteen visited a neurologist, 22 were interviewed through telephone, 2 gave response by a letter, and 10 were evaluated through hospital records. The influence of baseline characteristics on outcome 4 years later was evaluated by non-parametric tests. p values below 0.01 were considered significant. At follow-up, the 50 persons had a mean reduction of 6.5 headache days/month (p < 0.001) and 9.5 acute headache medication days/month (p < 0.001) compared to baseline. Headache index/month was reduced from 449 to 321 (p < 0.001). Sixteen persons (32%) were considered as responders due to a ?50% reduction in headache frequency from baseline, whereas 17 (34%) persons met the criteria for MOH. None of the baseline characteristics consistently influenced all five outcome measures. Total Hospital Anxiety and Depression Scale (HADS) score at baseline was predictors (p < 0.005) for being a responder after 4 years. At 4 years follow-up, one-third of the 50 MOH patients had ?50% reduction in headache frequency from baseline. A low total HADS score at baseline was associated with the most favorable outcome.
Related JoVE Video
Time trends in the prevalence of headache disorders. The Nord-Trondelag Health Studies (HUNT 2 and HUNT 3).
Cephalalgia
PUBLISHED: 12-01-2010
Show Abstract
Hide Abstract
Earlier reports regarding secular trends of migraine are conflicting, and there is a lack of long-term follow-up studies of other headache syndromes among adults. The aim of the present study was to assess any changes in the prevalence of the major headache types in a large adult population. With an 11-year interval, all inhabitants aged ?20 years (n?=?92,566 and 94,194) in the Norwegian county of Nord-Trøndelag were invited to participate in two cross-sectional surveys. Attendance rates were 56% and 42%. The age-adjusted 1-year prevalences, according to the diagnostic criteria of the International Headache Society, sex-ratios and attack frequencies were assessed. The migraine prevalence increased from 12.1% to 13.2% (P?
Related JoVE Video
[Neck pain with and without affection of nerve roots].
Tidsskr. Nor. Laegeforen.
PUBLISHED: 11-27-2010
Show Abstract
Hide Abstract
Background: The prevalence of neck pain is 30-50 %, and those most affected are women and people in working age. Neck pain and other musculoskeletal complaints are among the most common causes for sick leave and disability pension in Norway, which emphasises the need for guidelines on diagnostic assessment and treatment of these patients.
Related JoVE Video
Associations between serum lipid levels and chronic low back pain.
Epidemiology
PUBLISHED: 08-28-2010
Show Abstract
Hide Abstract
Low back pain may be related to abnormal lipid levels because of atherosclerosis in arteries supplying the lumbar region.
Related JoVE Video
Related JoVE Video
Genome-wide association study of migraine implicates a common susceptibility variant on 8q22.1.
Nat. Genet.
PUBLISHED: 03-01-2010
Show Abstract
Hide Abstract
Migraine is a common episodic neurological disorder, typically presenting with recurrent attacks of severe headache and autonomic dysfunction. Apart from rare monogenic subtypes, no genetic or molecular markers for migraine have been convincingly established. We identified the minor allele of rs1835740 on chromosome 8q22.1 to be associated with migraine (P = 5.38 × 10??, odds ratio = 1.23, 95% CI 1.150-1.324) in a genome-wide association study of 2,731 migraine cases ascertained from three European headache clinics and 10,747 population-matched controls. The association was replicated in 3,202 cases and 40,062 controls for an overall meta-analysis P value of 1.69 × 10?¹¹ (odds ratio = 1.18, 95% CI 1.127-1.244). rs1835740 is located between MTDH (astrocyte elevated gene 1, also known as AEG-1) and PGCP (encoding plasma glutamate carboxypeptidase). In an expression quantitative trait study in lymphoblastoid cell lines, transcript levels of the MTDH were found to have a significant correlation to rs1835740 (P = 3.96 × 10??, permuted threshold for genome-wide significance 7.7 × 10??. To our knowledge, our data establish rs1835740 as the first genetic risk factor for migraine.
Related JoVE Video
Associations between sleep disturbance and primary headaches: the third Nord-Trøndelag Health Study.
J Headache Pain
PUBLISHED: 02-10-2010
Show Abstract
Hide Abstract
The aim of the study was to evaluate the association between sleep disturbance and headache type and frequency, in a random sample of participants in the third Nord-Trøndelag Health Survey. The headache diagnoses were set by neurologists using the ICHD-2 criteria performing a semi structured face-to-face interview. Sleep problems were measured by the two validated instruments Karolinska Sleep Questionnaire (KSQ) and Epworth Sleepiness Scale (ESS). Among 297 participants, 77 subjects were headache-free, whereas 135 were diagnosed with tension-type headache (TTH), 51 with migraine, and 34 with other headache diagnoses. In the multivariate analyses, using logistic regression, excessive daytime sleepiness, defined as ESS >or= 10, was three times more likely among migraineurs compared with headache-free individuals (OR = 3.3, 95% CI 1.0-10.2). Severe sleep disturbances, defined as KSQ score in the upper quartile, was five times more likely among migraineurs (OR = 5.4, 95% CI 2.0-15.5), and three times more likely for subjects with TTH (OR = 3.3, 1.4-7.3) compared with headache-free individuals. Subjects with chronic headache were 17 times more likely to have severe sleep disturbances (OR = 17.4, 95% CI 5.1-59.8), and the association was somewhat stronger for chronic migraine (OR = 38.9, 95% CI 3.1-485.3) than for chronic TTH (OR = 18.3, 95% CI 3.6-93.0). In conclusion, there was a significant association between severe sleep disturbances and primary headache disorders, most pronounced for those with chronic headache. Even though one cannot address causality in the present study design, the results indicate an increased awareness of sleep problems among patients with headache.
Related JoVE Video
The validity of questionnaire-based diagnoses: the third Nord-Trøndelag Health Study 2006-2008.
J Headache Pain
PUBLISHED: 09-04-2009
Show Abstract
Hide Abstract
The Nord-Trøndelag Health Study (HUNT 3) performed in 2006-2008 is a replication of the cross-sectional survey from 1995 to 1997 (HUNT 2). The aim of the present study was to assess the sensitivity and specificity of questionnaire-based headache diagnoses using a personal interview by a neurologist as a gold standard. For the questionnaire-based status as headache sufferer, a sensitivity of 88%, a specificity of 86%, and a kappa statistic of 0.70 were found. Chronic headache, chronic tension-type headache (TTH), and medication overuse headache (MOH) were diagnosed with a specificity of > or =99%, and a kappa statistic of > or =0.73. Lower figures were found for the diagnoses of migraine and TTH. For individuals with headache > or =1 day per month, a sensitivity of 58% (migraine) and 96% (TTH), a specificity of 91 and 69%, and a kappa statistic of 0.54 and 0.44 were found, respectively. The specificity for migraine with aura was 95%. In conclusion, the HUNT 3-questionnaire is a valid tool for identifying headache sufferers, and diagnosing patients with chronic headache, including chronic TTH and MOH. The more moderate sensitivity for migraine and TTH makes the questionnaire-based diagnoses of migraine and TTH suboptimal for determining the prevalence. However, the high specificity of the questionnaire-based diagnosis of migraine, in particular for migraine with aura, makes the questionnaire a valid tool for diagnosing patients with migraine for genetic studies.
Related JoVE Video
The effect of pregnancy and parity on headache prevalence: the Head-HUNT study.
Headache
PUBLISHED: 06-24-2009
Show Abstract
Hide Abstract
In previous studies, pregnancy has been associated with less headache, but the influence of parity on this association is largely unknown.
Related JoVE Video
Lateralization in cluster headache: a Nordic multicenter study.
J Headache Pain
PUBLISHED: 03-23-2009
Show Abstract
Hide Abstract
A slight predominance of cluster pain on the right side has been reported in several studies. The aim of this large retrospective Nordic multicenter study was to estimate the prevalence of right- and left-sided pain in cluster headache (CH) patients with side-locked pain, the prevalence of side shifts in episodic and chronic CH patients, and the occurrence of cranial autonomic symptoms related to pain side. Among 383 cluster patients, 55 (14%) had experienced pain side shift. Of the remaining 328 individuals without side shift, there was no significant difference between the occurrence of right-sided and left-sided pain (54 vs. 46%). The prevalence of side shift was similar for episodic and chronic CH and the occurrence of cranial autonomic symptoms was not influenced by the pain side. In conclusion, previous reports of a side difference in location of cluster pain could not be confirmed in this large Nordic sample.
Related JoVE Video
High dietary caffeine consumption is associated with a modest increase in headache prevalence: results from the Head-HUNT Study.
J Headache Pain
PUBLISHED: 03-03-2009
Show Abstract
Hide Abstract
The aim of this study was to investigate the association between caffeine consumption and headache type and frequency in the general adult population. The results were based on cross-sectional data from 50,483 (55%) out of 92,566 invited inhabitants aged >or=20 years who participated in the Nord-Trøndelag Health Survey. In the multivariate analyses, adjusting for age, gender, smoking, and level of education as confounding factors, a weak but significant association (OR = 1.16, 95% CI 1.09-1.23) was found between high caffeine consumption and prevalence of infrequent headache. In contrast, headache >14 days/month was less likely among individuals with high caffeine consumption compared to those with low caffeine consumption. The results may indicate that high caffeine consumption changes chronic headache into infrequent headache due to the analgesic properties of caffeine. Alternatively, chronic headache sufferers tend to avoid intake of caffeine to not aggravate their headaches, whereas individuals with infrequent headache are less aware that high caffeine use can be a cause.
Related JoVE Video
Genome-wide association analysis identifies susceptibility loci for migraine without aura.
Nat. Genet.
Show Abstract
Hide Abstract
Migraine without aura is the most common form of migraine, characterized by recurrent disabling headache and associated autonomic symptoms. To identify common genetic variants associated with this migraine type, we analyzed genome-wide association data of 2,326 clinic-based German and Dutch individuals with migraine without aura and 4,580 population-matched controls. We selected SNPs from 12 loci with 2 or more SNPs associated with P values of <1 × 10(-5) for replication testing in 2,508 individuals with migraine without aura and 2,652 controls. SNPs at two of these loci showed convincing replication: at 1q22 (in MEF2D; replication P = 4.9 × 10(-4); combined P = 7.06 × 10(-11)) and at 3p24 (near TGFBR2; replication P = 1.0 × 10(-4); combined P = 1.17 × 10(-9)). In addition, SNPs at the PHACTR1 and ASTN2 loci showed suggestive evidence of replication (P = 0.01; combined P = 3.20 × 10(-8) and P = 0.02; combined P = 3.86 × 10(-8), respectively). We also replicated associations at two previously reported migraine loci in or near TRPM8 and LRP1. This study identifies the first susceptibility loci for migraine without aura, thereby expanding our knowledge of this debilitating neurological disorder.
Related JoVE Video
Genome-wide association study to identify common variants associated with brachial circumference: a meta-analysis of 14 cohorts.
PLoS ONE
Show Abstract
Hide Abstract
Brachial circumference (BC), also known as upper arm or mid arm circumference, can be used as an indicator of muscle mass and fat tissue, which are distributed differently in men and women. Analysis of anthropometric measures of peripheral fat distribution such as BC could help in understanding the complex pathophysiology behind overweight and obesity. The purpose of this study is to identify genetic variants associated with BC through a large-scale genome-wide association scan (GWAS) meta-analysis. We used fixed-effects meta-analysis to synthesise summary results across 14 GWAS discovery and 4 replication cohorts comprising overall 22,376 individuals (12,031 women and 10,345 men) of European ancestry. Individual analyses were carried out for men, women, and combined across sexes using linear regression and an additive genetic model: adjusted for age and adjusted for age and BMI. We prioritised signals for follow-up in two-stages. We did not detect any signals reaching genome-wide significance. The FTO rs9939609 SNP showed nominal evidence for association (p<0.05) in the age-adjusted strata for men and across both sexes. In this first GWAS meta-analysis for BC to date, we have not identified any genome-wide significant signals and do not observe robust association of previously established obesity loci with BC. Large-scale collaborations will be necessary to achieve higher power to detect loci underlying BC.
Related JoVE Video

What is Visualize?

JoVE Visualize is a tool created to match the last 5 years of PubMed publications to methods in JoVE's video library.

How does it work?

We use abstracts found on PubMed and match them to JoVE videos to create a list of 10 to 30 related methods videos.

Video X seems to be unrelated to Abstract Y...

In developing our video relationships, we compare around 5 million PubMed articles to our library of over 4,500 methods videos. In some cases the language used in the PubMed abstracts makes matching that content to a JoVE video difficult. In other cases, there happens not to be any content in our video library that is relevant to the topic of a given abstract. In these cases, our algorithms are trying their best to display videos with relevant content, which can sometimes result in matched videos with only a slight relation.