What is involved with a chemical stress test?

Hi everyone. I just had to go to see a cardiologist as a prerequisite to my surgery and because I can't run on the treadmill, the doctor will be doing a chemical stress test. Can someone tell me how I will feel, how fast does the medicine they inject get your heart beating, will I feel faint, do you have to lay down flat? Hopefully I'll have a couple of pillows because laying flat will smother me. Any information will be really helpful. Thanks to you all. Claire

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