PICC infusion can only be used as routine infusion in wards, and it is forbidden to use high-pressure injection pump to inject contrast media through PICC tube when patients are undergoing ct and MRI examination. Try not to tie a tourniquet, needle or measure blood pressure on one side of PICC catheter, and the cuffs of clothes should not be too tight. Clean ladies' heel-less socks or transparent socks can be used, and toes and elastic bands can be removed to prevent the catheter from coming out.