*Not sure what your motives are, but why would you want to cheat/obscure the test results? If you have high BP (hypertension) wouldn't you want to be aware of it? Or is it something like an employee requirement that you are trying to make sure you pass? If that's the case, a couple asprin's couldn't hurt. A low-dose beta blocker would probably be better. I'd also skip any caffiene/stimulants that morning. BTW, in my experience/opinion, "snapshot" EKG's are worthless anyway, unless you happen to have symptoms at that
exact moment.
* = just my opinion, not a doctor, blah, blah...