A cath is put in first, then a wire advanced into into it to help guode the cath. If a diffenent cath is needed wire is left in and the cath pulled out and a new one needed is advanced over the wire. At least in US. Maybe they do things differentrly up there. I would ask another person up there. You can prob Google it and see a YouTube on cardiac cath.
Answered 9/13/2023
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