Some links I found.
35 year old woman with coronary artery disease has a heart attack after first dose of SQ sumatriptan.
http://www.ncbi.nlm.nih.gov/pubmed/7783891
56-year-old female patient with migraine who experienced a myocardial infarction shortly after using sumatriptan, despite having had a normal cardiovascular evaluation.
http://www.ncbi.nlm.nih.gov/pubmed/8682677
Risk of severe cardiovascular adverse events after the use of a triptan is estimated at 1:100,000 treated attacks
http://www.ncbi.nlm.nih.gov/pubmed/20977405
42-year-old man with episodic cluster headache without history of coronary artery disease who was admitted to our coronary care unit for acute myocardial infarction after 3 h of subcutaneous injection of sumatriptan.
http://www.ncbi.nlm.nih.gov/pubmed/16601942?dopt=Abstract
If you keep looking there are more. Most cases, but not all involve people that already were experiencing some sort of heart condition. There are also a good amount of people reporting chest pain that turns out to most likely NOT involve any sort of heart problem. (There is something to also be said for the fact that just because you have not been diagnosed with a heart problem, that could still mean that you just have an UNDIAGNOSED heart problem) My take on everything I have read--if you have a pre-existing heart condition I would be pretty wary of taking sumatriptan. For the rest of us, be on the lookout for dangerous side effects but personally I am not too worried about it. There are a number of weird cases out there involving sumatriptan possibly having a negative cardiac event but with the unbelievably huge number of people that have at this point taken the drug with no problems, I'm not convinced it's something I should worry about enough to stop taking sumatriptan. I would however be very wary of mixing sumatriptan with certain meds (like verapamil).
Anybody have any other cardiac info on sumatriptan, whether from research or anecdotal?
-Ricardo