The nurse is caring for a client with a history of coronary artery disease who reports waking up with a sudden onset of viselike chest pressure. The client reports that the pain decreases at rest but continues to feel a constant mid-chest pressure. After obtaining the client's vital signs, which action should the nurse take next?

Listen for extra heart sounds, murmurs, and rhythm with the bell of the stethoscope.

Initiate dim lighting, lower alarm volumes, and control traffic in and out of the room area.

Obtain a 12-lead electrocardiogram and begin continuous cardiac monitoring.

Notify the unlicensed assistive personnel (UAP) to restrict family and visitors at this time.