Migraine Days Might Be a Better Endpoint
For patients with migraine who have risk factors for stroke, this makes PFO closure an attractive intervention, but a positive randomized trial is needed. Several are underway. Importantly, the trials now enrolling are using migraine days, which was significantly reduced in both PREMIUM and PRIMA, rather than migraine attacks as the primary endpoint.
“Migraine days is now accepted by the Food and Drug Administration as a criterion of benefit,” reported Jonathan Tobis, MD, Research Director, Interventional Cardiology, UCLA David Geffen School of Medicine, Los Angeles.
He explained that the FDA insisted on migraine attacks as the endpoint for the PREMIUM trial, but this was a far more challenging endpoint on which to show a statistical benefit. He emphasized that a new set of trials will now test efficacy on the basis of migraine days.
One of these trials, called RELIEF, which is randomizing patients to device closure of PFO or a sham procedure. Both groups are receiving clopidogrel or prasugrel based on a previous observation that patients who respond to these drugs are also more likely to respond to PFO closure.
Another trial, called COMPETE-2, is comparing PFO closure with a device to aspirin plus a sham closure. This trial is ongoing in China.
Stroke is not being evaluated as an endpoint in either trial, but Dr. Charles suggested that this does warrant attention.
“I would also just put it out there that, apart from simply migraine, this is a therapeutic approach that we might actually think about in terms of helping to prevent stroke in our migraine patients,” he said.
Senior author of a recent meta-analysis of trials evaluating PFO closure and control of migraine, Ling Liu, MD, Department of Neurology, University of Sichuan, Chengdu, China, agreed that PFO closure for the treatment of migraine deserves “a reevaluation.”
In his meta-analysis of three randomized trials, one pooled study, and eight retrospective case series with 1,165 patients, PFO closure was associated with a nearly 75% reduction (odds ratio [OR], 0.259; P = .0048) reduction in migraine days and 50% increase in resolution of migraine in patients with a history of migraine with aura (OR, 1.586; P = .227).
The incidence of stroke was not evaluated in this meta-analysis, but Dr. Liu believes that the evidence of reducing the burden of migraine with PFO closure is compelling. Given the evidence from this meta-analysis that PFO closure is safe, Dr. Liu maintained that a definitive trial is needed “especially for migraine with frequent aura.”
As an interventional cardiologist, Dr. Tobis said that when PFO closures is performed for prevention of stroke in patients with migraine, it often leads to reduced migraine activity and, in some cases, elimination of migraine. Like others, he believes new analyses should be conducted.
“Everyone involved in this field believes there is something there,” Dr. Tobis said. The missing link is a clinical trial to confirm it.
Dr. Charles and Dr. Liu report no potential conflicts of interest. Dr. Tobis reports a financial relationship with Holistick Medical.