On your underlying cardiac status.
..If ur young and have no blockages in ur heart, unlikely heart attack
- but if ur older and have blockages, maybe, bc too much thyroid hormone
makes ur heart work harder than necessary- if heart doesn't get enuf blood/oxygen
to do that work, that's a heart attack. Ur metabolism is higher bc of the extra thyroid horm, so if u cont to eat the way u r, u might gain.