In general, a heart catheterization takes 30-45 minutes to get all of the pictures taken, and then longer if a stent has to be placed (another 30-90 minutes, depending on how complicated it is).
Whether they do the procedure through the arm or the leg depends on where your bypass grafts are. If the leg is used, then you typically have to lay flat for 2-4 hours afterwards. If the arm is used, then you are able to sit up immediately afterwards and wear a band around your wrist for about an hour.
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