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My polish ex threatens to commit suicide after separation [62]
I don't want people to get any ideas that it's harmless to cut your wrist.
A longitudinal incision of the radial artery from the proximal to distal part of the forearm will minimize the vasoconstriction and give an extreme increase of the area where it can bleed from. I would say a few minutes before you get unconscious if it's done properly. Transverse incisions are not immediately life-threatening.
Interesting. I have had to deal with two episodes of cut wrists. The first (an accident) was with cut tendons, but not severed main artery. There seemed to be minimal blood loss, because of shock and fast application of first aid. Result: an immediate operation to fix the tendons.
The second was caused by jagged metal (a broken coke can) Blood everywhere, especially on another guy's coat. It happened in a London street. Result: Police (at first) jumping to conclusions. Young woman hospitalized.