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Migraine is associated with increased risks of cardiovascular problems including heart attacks, stroke, blood clots and an irregular heart rate. Migraine should be considered a potent and persistent risk factor for most cardiovascular diseases in both men and women. Previous studies have suggested a link between migraine and stroke and heart attacks, particularly among women.
Researchers from Aarhus University Hospital, Denmark and Stanford University, USA set out to examine the risks of heart conditions including heart attacks; stroke; peripheral artery disease (narrow arteries which reduce blood flow to limbs); blood clots and fast and irregular heart rates in people who experience migraines compared with people who don’t. The researchers collected patient data from the Danish National Patient Registry over a 19 year period, from 1995 to 2013.
They compared data from over 51,000 people who had been diagnosed with migraine with over 510,000 people who were migraine free. For each person with migraine, they matched 10 people of the same age and gender who were migraine free. The average age for migraine diagnosis was 35 years, and 71% of participants were women. Over a period of 19 years, the researchers found that migraine was positively associated with heart attack, stroke, blood clots and irregular heart rate.
For example, for every 1,000 patients, 25 patients with migraine had a heart attack compared with 17 migraine free patients and 45 patients with migraine had an ischaemic stroke (blood clot in the brain) compared with 25 migraine free patients. These associations persisted after taking account of body mass index and smoking. No meaningful association was found with peripheral artery disease or heart failure.
The associations, particularly for stroke, were stronger in the first year of diagnosis than the long term, in patients with migraine aura-warning signs before a migraine, such as seeing flashing lights.
People with migraine often use anti-inflammatory drugs, which are associated with increased risks of heart problems, while immobilisation related to migraine attacks may increase the risk of blood clots.
They note that current guidelines do not recommend use of anti-clotting drugs such as aspirin to treat migraine, but call on clinicians to consider whether patients at particularly high risk of heart disease would benefit from anticoagulant treatment. Migraine should be considered a potent and persistent risk factor for most cardiovascular diseases.
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