2007-03-30 13:43:05 · 5 answers · asked by zap 5 in Science & Mathematics ➔ Medicine
When someone passes out during phlebotomy (blood drawing), it is usually a vago-vagal reaction. What they are seeing disturbs them so much that all the blood vessels dilate in their body. This drops their blood pressure too low and their heart also slows down. There isn't enough pressure to perfuse their brain and they pass out. Once they pass out, their capacitance vessels (veins) return to their normal size and the heart starts beating normally again, re=establishing necessary blood flow and they wake up. I do not believe someone can die as this is happening unless they hit their head as they fall and develop an intracranial hemmorhage. Where do they go? They are unconscious, like a temporary self limiting coma.
2007-03-30 13:52:18 · answer #1 · answered by misoma5 7 · 2⤊ 0⤋
Well I hope not to go anywhere. If I wake up in a different place I am hoping nothing weird has happened to me. I don't want to wake up with a plastic tube (ETT) in my mouth!
2007-03-31 00:57:08 · answer #2 · answered by ChrisG 1 · 0⤊ 0⤋
Usually, straight to the floor.
2007-03-30 20:47:11 · answer #3 · answered by Ralfcoder 7 · 0⤊ 1⤋
to the land of the wimps.
2007-03-31 11:51:17 · answer #4 · answered by bad guppy 5 · 0⤊ 0⤋
to another world......who knows, pretty interesting question though.
2007-03-30 20:48:02 · answer #5 · answered by roxy39_2002 2 · 0⤊ 0⤋