Final answer:
The nurse should attach the PCA pump tubing to the client's intravenous access device.
Step-by-step explanation:
The nurse should take the next action of attaching the PCA pump tubing to the client's intravenous access device. This is an essential step in administering medication via the PCA pump as it ensures the medication is delivered directly into the client's bloodstream. Checking the pump's electrical cords for cracks, splits, or fraying can be done prior to programming, and documenting the implementation of the PCA on the client's chart should be done after the tubing is attached. Verifying the settings with another nurse is not necessary at this point if the nurse has already completed programming using the prescribed parameters.