A patient has a long history of smoking. He has blood studies done because he is very tired, short of breath, and does not feel well. His blood gases reveal the following findings: pH 7.3, HCO3- 25 mEq/L, PaCO2 48 mmHg. What is the interpretation of these gases? Select all that apply: Normal range: pH: 7.35-7.45 PaCO2: 36-44 mmHg HCO3-: 22-26 mEq/L