Novas opções para o tratamento preventivo da migrânea: revisão com considerações fisiopatológicas

BACKGROUND: The pharmacological treatment of migraine may be acute or preventive. Frequent, severe and long-lasting migraine attacks require prophylaxis. Multiple threads of research over the last 15 years have led to the concept that migraine is generated from a hyperexcitable brain. A variety of causes for hyperexcitability of the brain in migraine have been suggested. These causes include low cerebral magnesium levels, mitochondrial abnormalities, dysfunctions related to increased nitric oxide or the existence of a P/Q type calcium channelopathy. The better knowledge about migraine pathophisiology led us to discuss new treatment options. OBJECTIVES: The aim of the present study is to present an evidence-based review of some new drugs or some agents that even though available for a long time, are not frequently used. METHODS/RESULTS: We present a review of anticonvulsants with various mechanisms of action such as lamotrigine, gabapentin, topiramate, tiagabine, levetiracetam and zonisamide. We also review natural products, like riboflavin and magnesium, botulinum toxin A, a specific CGRP antagonist and the anti-asthma medication montelukast, with pathophysiological discussion. CONCLUSIONS: We aimed to present an update of newer or less frequently used preventive migraine therapies, drugs that might reduce the burden and the costs of a disease that should be considered as a public health problem all around the world.INTRODUÇÃO: O tratamento farmacológico da migrânea pode ser dividido em agudo e preventivo. Crises de migrânea severas, de longa duração e incapacitante requerem profilaxia. Múltiplas linhas de pesquisa ao longo dos últimos 15 anos sedimentaram o conceito de que a migrânea é gerada a partir de um cérebro hiperexcitável. Variadas causas para essa hiperexcitabilidade têm sido sugeridas e incluem baixo nível de magnésio cerebral, anormalidades mitocondriais, disfunções relacionadas ao óxido nítrico e a existência de distúrbios nos canais de cálcio do tipo P/Q. O melhor conhecimento sobre a fisiopatologia da migrânea nos permite discutir novas opções terapêuticas. OBJETIVOS: O objetivo do presente estudo é apresentar revisão baseada em evidências de novos agentes e outros que, embora disponíveis há mais tempo, não são freqüentemente utilizados, com considerações fisiopatológicas. MÉTODOS/RESULTADOS: Serão revistos anticonvulsivantes com vários mecanismos de ação, como gabapentina, lamotrigina, topiramato, tiagabina, levetiracetam e zonisamida. Serão revistos também produtos naturais, como riboflavina e magnésio, toxina botulínica do tipo A, um antagonista CGRP específico e uma nova opção para o tratamento da asma, o montelukast. CONCLUSÕES: Objetivamos apresentar artigo de atualização em opções novas ou não freqüentemente utilizadas no tratamento preventivo da migrânea, drogas que podem reduzir o fardo e os custos de uma doença que deve ser considerada um problema de saúde pública em todo o mundo

Favorable outcome of early treatment of new onset child and adolescent migraine-implications for disease modification.

There is evidence that the prevalence of migraine in children and adolescents may be increasing. Current theories of migraine pathophysiology in adults suggest activation of central cortical and brainstem pathways in conjunction with the peripheral trigeminovascular system, which ultimately results in release of neuropeptides, facilitation of central pain pathways, neurogenic inflammation surrounding peripheral vessels, and vasodilatation. Although several risk factors for frequent episodic, chronic, and refractory migraine have been identified, the causes of migraine progression are not known. Migraine pathophysiology has not been fully evaluated in children. In this review, we will first discuss the evidence that early therapeutic interventions in the child or adolescent new onset migraineur, may halt or limit progression and disability. We will then review the evidence suggesting that many adults with chronic or refractory migraine developed their migraine as children or adolescents and may not have been treated adequately with migraine-specific therapy. Finally, we will show that early, appropriate and optimal treatment of migraine during childhood and adolescence may result in disease modification and prevent progression of this disease

Favorable outcome of early treatment of new onset child and adolescent migraine-implications for disease modification.

There is evidence that the prevalence of migraine in children and adolescents may be increasing. Current theories of migraine pathophysiology in adults suggest activation of central cortical and brainstem pathways in conjunction with the peripheral trigeminovascular system, which ultimately results in release of neuropeptides, facilitation of central pain pathways, neurogenic inflammation surrounding peripheral vessels, and vasodilatation. Although several risk factors for frequent episodic, chronic, and refractory migraine have been identified, the causes of migraine progression are not known. Migraine pathophysiology has not been fully evaluated in children. In this review, we will first discuss the evidence that early therapeutic interventions in the child or adolescent new onset migraineur, may halt or limit progression and disability. We will then review the evidence suggesting that many adults with chronic or refractory migraine developed their migraine as children or adolescents and may not have been treated adequately with migraine-specific therapy. Finally, we will show that early, appropriate and optimal treatment of migraine during childhood and adolescence may result in disease modification and prevent progression of this disease