Why must nitroglycerin be discontinued contained by a forgiving who is roughly speaking to go through stress carrying out tests?

Why must nitroglycerin be discontinued contained by a forgiving who is roughly speaking to go through stress carrying out tests?
Multiple causes are near:
1) nitrates cause vasodilatation, and can result contained by fall of BP, and it increases heart rate, and can result contained by life threatening complications of acute make-up .
2)since the objective is to assess maximum target heart rate attainable underneath normal condition, it may interfere near the test and a misleading RESULT can be achieved.
3)even prior to anesthesia, adjectives cardiac medications are stopped.
Hope you own got an insight attitude.
Orthostatic hypotension..the feeling of getting up too swiftly, you become lightheaded and faint. Nitrides (nitroglycerin) cause arteries and veins to overt causing blood to rush everywhere except your brain, your blood pressure drops and you giddy.not a pretty picture.
Because they want to measure the full stress on the heart w/o drugs.Its an evaluation to see how much stress the heart can help yourself to.