The radio active material is picked up by the heart via the blood flow. If there is no blood flow to a certain part of the heart it shows up as a blank spot on the pic. They do a resting set of pic's and a set when you are "stressing" the heart. A performance evaluation of the heart at both states.. They can also take measurements to see if the heart is pumping properly and with enough volume called a ejection fraction.. Usually on a tread mill with you wired up like a old time stereo.
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https://www.mayoclinic.org/tests-procedures/nuclear-stress-test/about/pac-20385231
BTW I'm the same with my Doc.. He want to go charging off in all directions. Risk vs Reward..
I joke with him asking if is it that time of the month he needs to make a boat payment? or was that alimony 
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