A client who is found unresponsive has arterial blood gases drawn, and the results indicate the following: - pH is 7.12 (normal range: 7.35-7.45) - PaCO2 is 90 mm Hg (normal range: 35-45) - HCO3- is 22 mEq/L (normal range: 22-26) The nurse interprets the results as indicating which condition?