28 October 2009

Migraine aura doubles stroke risk

Migraines accompanied by a blurring of vision known as "aura" double the risk of stroke, according to a new study.


Migraines accompanied by a blurring of vision known as "aura" double the risk of stroke, according to a new study.

That risk becomes even higher for woman, persons under 45, and smokers, said the study, published in the British Medical Journal.

Women who use contraceptives that contain oestrogen boost the odds of suffering a stroke even further.

Up to 20% of adults - three-quarters of them women - suffer migraine headaches often characterised by vomiting or extreme sensitivity to light and noise.

Up to a third of these patients experience a so-called aura before or during the headache, typically described as a strange light, unpleasant smell or confusing thoughts.

Earlier research has uncovered a correlation between migraines and strokes, but did not distinguish between different kinds of migraines, or investigate possible links to other types of cardiovascular disease.

Scientists led by Markus Schurks of Brigham and Women's Hospital in Boston sifted through nine studies in an effort to fill in some of these gaps.

They found that migraines with aura push up the risk of strokes caused by reduced blood flow twofold, but uncovered no association between migraines of any kind and heart attacks or death due to cardiovascular disease.

Quit smoking, use the right pills
The researchers recommend that young women who have migraine with aura should stop smoking and use oestrogen-free birth control methods.

"Clinicians need to identify young women with migraine, particularly those who are seeking oestrogen-containing hormonal contraception," concurred Elizabeth Loder of Harvard Medical School in a commentary, also in the British Medical Journal.

The absolute risk of stroke for most patients with migraine remains low, Loder said, "so a doubling of risk is not cause for panic."

"At a population level, however, this risk deserves attention between the prevalence of migraine is so high," she added.

(AFP, October 2009)

Stroke Centre


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Dr Elliot Shevel is a South African migraine surgery pioneer and the founder and medical director of The Headache Clinic in Johannesburg, Durban and Cape Town, South Africa. The Headache Clinic is a multidisciplinary practice dedicated to the diagnosis and treatment of Primary Headaches and Migraines. Dr Shevel is also the main author of all scientific publications generated by his team. He recently won a high level science debate in which he was able to prove that the current migraine diagnosis and classification is not based on data. Tertiary Education - Dr Shevel holds both Dental and Medical degrees, and practises as a specialist Maxillo-facial and Oral Surgeon. Follow the Headache Clinic on Twitter@HeadacheClinic.

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