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What happens to healthy people when they receive nitroglycerin?


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Like many people I received nitroglycerin under the tongue during my tilt table test, and I became weak, ill, and my heart rate increased. I know this is given to people with heart failure or reduced blood flow to the heart so their blood vessels can dilate, but what happens to a healthy person who gets it? Do they feel nothing at all, or do they get weak from over dilated blood vessels but without tachycardia? 

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I believe Nitroglycerin is given to people during a TTT to mimic the same stress on the heart that occurs during being upright for a long time. I had it during my TTT and promptly passed out. I believe that this is more common in people with orthostatic intolerance, "normal" people likely will be able to recover from the nitro without passing out, but a increase in HR and drop in BP is normal. 

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