Final answer:
The nurse should review a signal the client can use if feeling any distress and have a petroleum-based lubricant available before beginning the procedure to insert an NG tube for gastric decompression.
Step-by-step explanation:
Before beginning the procedure to insert an NG tube for gastric decompression, the nurse should review and establish a communication signal with the client that the client can use to indicate any distress. This ensures that the nurse can respond promptly to any discomfort or complications during the procedure.
In addition, the nurse should have a petroleum-based lubricant available. Lubricating the NG tube helps facilitate its insertion and reduces discomfort for the client.
Therefore, options a (reviewing a signal the client can use if feeling any distress) and e (having a petroleum-based lubricant available) are the correct actions that the nurse should take before beginning the procedure.