A conscious and alert 44-year-old woman complains of chest pain and slight shortness of breath. She appears to have no difficulty speaking and states that the pain suddenly started about two hours ago. There is a history of blood clots in the lungs in her family, and she is scared and would like to be evaluated. Which one of the following should you do FIRST?

A) Perform a secondary assessment.
B) Place her on the stretcher for transport.
C) Determine the adequacy of her breathing.
D) Place high-flow oxygen via nonrebreather on the patient.

Answer: D