Mr. etterly, age 66, has just been admitted to the nursing unit reporting severe chest pain, a frequent productive cough, and shortness of breath. physical assessment findings include increased ap chest diameter, finger clubbing, anduse of accessory muscles. abg findings include: ph, 7.32; pao2, 68; paco2, 55; and pahco3, 28. what is the priority problem for mr. etterly? what led the nurse to identify this problem?