An individual with a 20-year history of smoking three packs/day who has emphysema has the following data: pH = 7.37; [HCO3−] = 28 mEq/L; Pco2 = 50 mm Hg.Which acid-base disturbance is consistent with this clinical scenario and these arterial blood gas measurements?
A)Metabolic acidosis with respiratory compensation B)Metabolic alkalosis with respiratory compensation C)Respiratory acidosis with renal compensation (chronic respiratory acidosis) D)Respiratory acidosis without renal compensation (acute respiratory acidosis) E)Metabolic acidosis and respiratory acidosis