What bp levels could be dangerous and dissection my aorta? short term? i got up to 190 in a stress test. max hr were 196

Normal: That's a normal BP for a stress test. Also, at 23, your maximum predicted HR is 197, so you were at 99% of your MPHR-that's good! There is no BP that will predictably cause an aortic dissection. If your aorta is severely dilated or you have Marfan's Syndrome, it can dissect with a normal BP. BP >240 systolic or >130 diastolic is generally considered to be elevated sufficiently to cause adverse sx.