A Patient Aspirated While Eating and Suffered a Respiratory Arrest

A patient aspirated while eating and suffered a respiratory arrest.A code blue was called,the obstruction was removed,but the patient required endotracheal intubation.Postintubation,the nurse hears breath sounds bilaterally,but the carbon dioxide monitor indicates a higher than expected level.Which patient history could account for this discrepancy?

A) The patient's original admittance diagnosis was dehydration.
B) The patient's wife reports,"We were talking and laughing when he choked."
C) The patient has history of calcium deficiency requiring dietary supplementation.
D) The patient's wife says,"He had some heartburn earlier,so the nurse had given him a lemon-lime soda to drink with his supper."