The nurse is caring for a patient who was hospitalized 2 days earlier with aspiration pneumonia. Which assessment information is most important to communicate to the health care provider?

The patient has a cough that is productive of blood-tinged sputum.

The patient's temperature is 101.5 F after 2 days of IV antibiotic therapy.

The patient has scattered crackles throughout the posterior lung bases.

The patient's SpO2 has dropped to 90%, although the O2 flow rate has been increased.