Twelve hours following orthopedic surgery on the right leg, the client begins to have acute chest pain and difficulty breathing. Which action should the nurse take first?

Notify healthcare provider (HCP) of the symptoms and administer a PRN pain medication.

Increase the client's IV flow rate and start low flow oxygen.

Position the client on the left side while immobilizing the affected leg.

Take the client's vital signs and auscultate all lung sounds.