The nurse provides care for an older adult client diagnosed with Parkinson disease and pneumococcal pneumonia. The client receives oxygen per nasal cannula at 4 L/min. If the oxygen therapy is effective, which finding will the nurse observe?
1. The client is more alert and less agitated.
2. The client's lung sounds have a decrease in crackles.
3. The client is able to expectorate secretions.
4. The client's systolic BP drops 10 mm Hg when standing.