Final answer:
The nurse should first assess the client's chest dressing and vital signs.
Step-by-step explanation:
The intervention that the nurse should implement first for a client who is 1 day postoperative coronary artery bypass surgery and complains of chest pain is to b. Assess the client's chest dressing and vital signs.
Assessing the client's chest dressing and vital signs is crucial to identify any potential complications that may be causing the chest pain. It allows the nurse to check for signs of infection, bleeding, or other issues that require immediate attention.
Once the assessment is done and any urgent issues are ruled out or addressed, the nurse can proceed with other appropriate interventions.