Aerosmith frontman Steven Tyler has dismissed rumors that he suffered a heart attack or seizure. In September, the rock band cancelled the remainder of its South American tour due to Tyler's "unexpected medical issues." The 69-year-old musician wrote on the official Aerosmith website on Monday, ?I give you all an A+ for creative speculations but I certainly did not have a heart attack or a seizure. I had to have a procedure that only my doc in the United States could perform.?