The next day you are again assigned to care for a. b. at the beginning of the shift, you assess a. b. and find that his condition is stable. his lung sounds remain diminished in the right lower lobe and his spo2 is 95% on oxygen at 2 l per nasal cannula. the chest drainage system is attached to suction at 20 mm hg; there is still an air leak present. his morning chest x-ray examination showed some residual pleural effusion. four hours into your shift, he pages you through the call system and tells you he feels “short of breath.” you immediately go to his room. a. b. is sitting in the chair. describe the priority assessment you must perform at this time. assess respiratory function—respiration rate, breath sounds, o2 saturation, drainage system