At our hospital we advise pt's to use Cold Compresses q4hrs x 20 mins. for 24hrs. then warm compresses q4 for 24hrs. : of course this is while awake. We also advise the pt. to elevate their arm when possible. If 100cc or greater of IV contrast infiltrates, then our protocol requires a Plastics consult. I hope this helps. We also do a follow-up phone call in 24hrs to check on the pt's condiion.