The nurse prepares the client to change the peripherally inserted central catheter (PICC) dressing. Which action should the nurse take to prevent air embolus?
1) Ensure the client is in a supine position during the dressing change
2) Apply a sterile occlusive dressing to the PICC site after the dressing change
3) Use aseptic technique when removing the old dressing
4) Flush the PICC line with normal saline before and after the dressing change