My cardiovascular intervention appointment date was temporarily changed. Does the original pre-procedure preparation plan still apply?

You should contact the team responsible for scheduling the intervention to reconfirm. Do not simply shift the original plan to the new date. Go over each item to verify the arrival time, whether existing tests can still be used, and whether the previous diet and medication instructions need to be updated. If you have already taken preparation steps based on the old schedule, describe what you did and when, ask the team for further instructions, and try to get written instructions that you can keep.