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 124,988 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Chronic migraine and transformed migraine are conditions with a progression from episodic to chronic headache, a disabling stage. During attack, cutaneous allodynia frequently occurs: it reflects sensitisation of the central neurons of the trigeminovascular system. Early triptan therapy (prior to the development of central sensitisation) may protect from the chronicisation of migraine. In addition, early recognition of non-headache changes in neurologic function between episodes of headache offers a sensitive indicator of headache transformation. Attack frequency is the stronger predictor for migraine progression: prophylactic agents could be administered to patients with a high number of attacks. Medication overuse is the most important iatrogenic risk factor for the acceleration of disease and it must be prevented; other important risk factors are female sex, obesity and stressful life events.
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PMID:Preventing chronicity of migraine. 1636 3

Chronic migraine (CM) has been associated with idiopathic intracranial hypertension without papilloedema (IIHWOP), a significant percentage of these cases occurring in obese patients with intractable headache. A prospective study from February 2005 to June 2006 was made of 62 CM patients who fulfilled International Headache Society diagnostic criteria and had cerebral magnetic resonance venography (MRV) and lumbar puncture (LP) done. Two patients were excluded, six (10%) with elevated cerebrospinal fluid (CSF) open pressure (OP), five with body mass index (BMI) > 25. None of the patients had papilloedema or abnormal MRV. BMI and CSF OP were significantly correlated (r = 0.476, P < 0.001, Pearson's correlation test). Obesity (defined as BMI > 30) was a predictor of increase in intracranial pressure (defined as OP > 200 mmH(2)O) (f = 17.26, 95% confidence interval 6.0, 8.6; P < 0.001). From our study we strongly recommend that not only intractable CM patients with high BMI, but also first diagnosed patients with BMI > 30 should be systematically evaluated by a LP to rule out IIHWOP.
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PMID:Idiopathic intracranial hypertension with and without papilloedema in a consecutive series of patients with chronic migraine. 1917 Jul 2

Chronic migraine (CM) is the most disabling of the 4 types of primary chronic daily headache (CDH) of long duration, a syndrome defined by primary headaches 15 or more days per month for at least 3 months with attacks that last 4 hours or more per day on average. CDH of long duration includes CM, chronic tension-type headache, new daily persistent headache, and hemicrania continua. CM affects approximately 2% of the adult population in Western countries, imposing substantial burdens on individual sufferers and their families and, more broadly, upon society. Although this disorder is highly disabling and prevalent, it remains largely underdiagnosed and undertreated. Diagnosing CM requires a systematic approach that includes these steps: (1) exclude a secondary headache disorder, and (2) diagnose a specific primary headache syndrome based on frequency and duration, for example, short-duration episodic, long-duration episodic, or long-duration chronic. CM usually develops as a complication of episodic migraine after a period of increasing headache frequency. This migraine transformation is associated with a number of risk factors, some of which cannot be modified, including age and race. Other risk factors for CM are modifiable, such as obesity, snoring, head injury, stressful life events, and overuse of opioids and barbiturates. However, risk factor modification has not yet been shown to decrease the likelihood of CM onset. According to a cross-sectional analysis of data from the American Migraine Prevalence and Prevention study published this year in Journal of Neurology, Neurosurgery, and Psychiatry, when compared to patients with episodic migraine, patients with CM were significantly less likely to be employed full-time and almost twice as likely to be occupationally disabled. In addition, patients with CM were nearly twice as likely to have anxiety, chronic pain, or depression. Furthermore, patients with CM had higher cardiovascular and respiratory risk, were 40% more likely to have heart disease and angina, and were 70% more likely to have a history of stroke. These findings highlight the paramount importance of clinical vigilance, accurate diagnosis, and appropriate, effective management - including treatment or referrals - to improve patient outcomes.
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PMID:Chronic migraine, classification, differential diagnosis, and epidemiology. 2177 Sep 29

Chronification of migraine headaches is one of the most urgent issues. Chronic migraine (CM) and medication overuse headache (MOH) are defined in international classification of headache disorders II (ICHD-II). Appendix criteria of CM and MOH were submitted and will take over the original criteria. I described a case of CM and a case of MOH. Here I pointed out some practical issues in diagnosis of CM or MOH. 1) It is not easy to define the association of headache worsening and the beginning of medication overuse in many cases. 2) Some patients cannot discontinue the overused drugs; therefore, the diagnosis of CM nor MOH cannot be completed. 3) Some patients are not released from their headache even after the discontinuation of drug. In these cases, there are two possibilities. As a result of CM, the patient had simply overused the ineffective medications. From another point of view, MOH caused irreversible brain changes and MOH do not disappear after the detoxification. 4) In a practical management, we often prescribe preventive medications simultaneously at the beginning of detoxification. In these cases, it is unclear which one of the detoxification or the preventive medication contributes the improvement of headache. The chronification of migraine is regarded as chronification of acute mechanism of migraine, i.e., inflammation of the trigeminovascular system and sensitization of the brain. Apart from medication overuse, there have been reported some new risk factors for migraine chronification, including frequent headache, female sex, obesity, low income, low education, stress by life events, depression, snoring, sleep disorders, and past history of neck or head injury. Chronification of migraine severely disturbs the quality of patient's life. More attention should be paid and the further and extensive studies are urgently necessary.
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PMID:[Clinical features and mechanisms of chronic migraine and medication-overuse headache]. 2192 39

Chronic migraine (that is to say, cases where migraine is suffered on 15 or more days per month) is an illness that affects approximately 0.5-2.5% of the population, depending on the statistics that are analysed and the definition of chronic migraine used. The incidence of transformation from episodic to chronic migraine is 3% per year, and 6% go from low-frequency (1-9 days/month) to high-frequency migraine (10-14 days/month). The risk factors for developing chronic migraine are genetic, frequent use of painkillers, being female, having poor hygienic-dietary habits, developing anxiety/depression, having a low socioeconomic status, suffering from obesity and being divorced or widowed. Despite the modification of the risk factors, it has still not been proved that the chances of developing chronic migraine can be lowered. Chronic migraine has an important impact on patients' quality of life, as measured on disability, quality of life and impact on daily activities scales. These patients have twice the chance of suffering from depression, anxiety and chronic pain, which means they therefore need greater health care. Many have still to be diagnosed and treated, however. In a Spanish epidemiological study, a follow-up was carried out on patients with chronic daily headache after undergoing a therapeutic intervention and up to 60% of the patients showed improvement. In other words, with increased interest and diagnosis of this illness, many patients would benefit from suitable treatments.
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PMID:[Chronic migraine: its epidemiology and impact]. 2253 40

Chronic migraine has a great detrimental influence on a patient's life, with a severe impact on socioeconomic functioning and quality of life. Chronic migraine affects 1-2% of the general population, and about 8% of patients with migraine; it usually develops from episodic migraine at an annual conversion rate of about 3%. The chronification is reversible: about 26% of patients with chronic migraine go into remission within 2 years of chronification. The most important modifiable risk factors for chronic migraine include overuse of acute migraine medication, ineffective acute treatment, obesity, depression and stressful life events. Moreover, age, female sex and low educational status increase the risk of chronic migraine. The pathophysiology of migraine chronification can be understood as a threshold problem: certain predisposing factors, combined with frequent headache pain, lower the threshold of migraine attacks, thereby increasing the risk of chronic migraine. Treatment options include oral medications, nerve blockade with local anaesthetics or corticoids, and neuromodulation. Well-defined diagnostic criteria are crucial for the identification of chronic migraine. The International Headache Society classification of chronic migraine was recently updated, and now allows co-diagnosis of chronic migraine and medication overuse headache. This Review provides an up-to-date overview of the classification of chronic migraine, basic mechanisms and risk factors of migraine chronification, and the currently established treatment options.
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PMID:Chronic migraine: risk factors, mechanisms and treatment. 2738 92