Hi dlrf9p,
Thank you for your question and being part of the Migraine family - we're glad you're here!
I wish I had more information for you, but this is out of my area of expertise. Have you had an opportunity to discuss this with your cardiologist? If not, that may be a good place to start.
I did want to mention not all "headache specialists" are created equal. Many doctors claim to be "headache specialists" because they see a large number of patients with migraine and headache disorders, but that really may not be the case. A true migraine/headache specialist is board certified in headache medicine, which is different than being certified in neurology. Neurologists may be fine doctors, but have a hard time being experts in one area because they treat so many different conditions such as stroke, epilepsy, multiple sclerosis, Parkinson's and others. True migraine/headache experts treat one condition all day, every day - migraine and headache disorders. Let me share this information on how these doctors are different and how to find one; http://migraine.com/blog/how-are-migraine-specialists-different/
and https://migraine.com/blog/really-find-headache-specialist/.
I hope that helps!
Nancy