The nurse is аssigned а pаtient admitted fоr pоst-оp care following excision of a large mass of lung adenocarcinoma via thoracotomy. During morning rounds, the patient complains of 10/10 incisional pain. Further assessment reveals shallow breathing, a weak cough and scattered coarse crackles and rhonchi to all lung lobes. The patient is on 2L of oxygen per nasal cannula. Vital signs are below. Vital Signs: Temperature Blood Pressure (BP) Heart Rate (HR) Oxygen Saturations (SpO2) Respiratory Rate (RR) 98.9 Fahrenheit 117/83 91 90% 25 Following head-to-toe assessment, the nurse increases the oxygen to 4 L/min. What additional nursing action is most likely to improve the patient's oxygenation status at this time?