Wouldn't matter. Cardiac stress tests usually use technetium or some other radioactive tracer which remains in the body for a day or two after the test. That means that, for the next day or so, you are a "radiation hazard" (not really, but the dosimeters don't know the difference, or at least that's what I was told by the radiation control officer).

From all this uproar lately, sounds like work is a cardiac stress test for the TSA.