What terrestrial medical experience translates remarkably well to the immediate, self-sufficient care required in spaceflight medicine?

Answer

Emergency Medicine focusing on austere or remote environments

Physicians whose experience lies in handling medical issues in remote or austere settings on Earth possess skill sets that are highly applicable to spaceflight medicine due to the necessity of immediate, self-sufficient action.

What terrestrial medical experience translates remarkably well to the immediate, self-sufficient care required in spaceflight medicine?
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