A 58-year-old woman comes to the office due to gradually worsening shortness of breath. She has a history of emphysema secondary to alpha-1 antitrypsin deficiency and uses inhaled bronchodilators and glucocorticoids. Lately she has been feeling short of breath even with minimal exertion. She has no other medical conditions and is a former smoker with a 5-pack-year history. Blood pressure is 130/80 mm Hg, pulse is 82/min, and respirations are 18/min. Physical examination shows increased anteroposterior chest diameter, prolonged expiratory phase, and decreased breath sounds bilaterally. The heart sounds are distant. Chest x-ray reveals hyperinflated lungs with no consolidation, pleural effusion, or pneumothorax. Which of the following sets of arterial blood gas findings on room air (pH; PaCO2 [mm Hg]; plasma HCO3 [mEq/L]; PaO2 [mm Hg]) is most likely to be seen in this patient?
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